X-Git-Url: http://cgit.sxemacs.org/?p=packages;a=blobdiff_plain;f=xemacs-packages%2Fgnus%2Flisp%2Fgnus-fallback-lib%2Feieio%2Feieio.el;fp=xemacs-packages%2Fgnus%2Flisp%2Fgnus-fallback-lib%2Feieio%2Feieio.el;h=0342e7571d9cc21124d4e240937103973407165d;hp=0000000000000000000000000000000000000000;hb=264824bc7542eec5be4349263b36e13c713e61a5;hpb=e10974b04b06bb129bf57b2c9edfc950caabc073 diff --git a/xemacs-packages/gnus/lisp/gnus-fallback-lib/eieio/eieio.el b/xemacs-packages/gnus/lisp/gnus-fallback-lib/eieio/eieio.el new file mode 100644 index 00000000..0342e757 --- /dev/null +++ b/xemacs-packages/gnus/lisp/gnus-fallback-lib/eieio/eieio.el @@ -0,0 +1,2999 @@ +;;; eieio.el --- Enhanced Implementation of Emacs Interpreted Objects +;;; or maybe Eric's Implementation of Emacs Intrepreted Objects + +;; Copyright (C) 1995-1996, 1998-2016 Free Software Foundation, Inc. + +;; Author: Eric M. Ludlam +;; Version: 1.3 +;; Keywords: OO, lisp + +;; This file is part of GNU Emacs. + +;; GNU Emacs is free software: you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation, either version 3 of the License, or +;; (at your option) any later version. + +;; GNU Emacs is distributed in the hope that it will be useful, +;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;; GNU General Public License for more details. + +;; You should have received a copy of the GNU General Public License +;; along with GNU Emacs. If not, see . + +;;; Commentary: +;; +;; EIEIO is a series of Lisp routines which implements a subset of +;; CLOS, the Common Lisp Object System. In addition, EIEIO also adds +;; a few new features which help it integrate more strongly with the +;; Emacs running environment. +;; +;; See eieio.texi for complete documentation on using this package. +;; +;; Note: the implementation of the c3 algorithm is based on: +;; Kim Barrett et al.: A Monotonic Superclass Linearization for Dylan +;; Retrieved from: +;; http://192.220.96.201/dylan/linearization-oopsla96.html + +;; There is funny stuff going on with typep and deftype. This +;; is the only way I seem to be able to make this stuff load properly. + +;; @TODO - fix :initform to be a form, not a quoted value +;; @TODO - Prefix non-clos functions with `eieio-'. + +;;; Code: + +(eval-when-compile + (require 'cl)) + +(defvar eieio-version "1.3" + "Current version of EIEIO.") + +(defun eieio-version () + "Display the current version of EIEIO." + (interactive) + (message eieio-version)) + +(eval-and-compile +;; About the above. EIEIO must process its own code when it compiles +;; itself, thus, by eval-and-compiling outselves, we solve the problem. + +;; Compatibility +(if (fboundp 'compiled-function-arglist) + + ;; XEmacs can only access a compiled functions arglist like this: + (defalias 'eieio-compiled-function-arglist 'compiled-function-arglist) + + ;; Emacs doesn't have this function, but since FUNC is a vector, we can just + ;; grab the appropriate element. + (defun eieio-compiled-function-arglist (func) + "Return the argument list for the compiled function FUNC." + (aref func 0)) + + ) + + +;;; +;; Variable declarations. +;; + +(defvar eieio-hook nil + "*This hook is executed, then cleared each time `defclass' is called.") + +(defvar eieio-error-unsupported-class-tags nil + "Non-nil to throw an error if an encountered tag is unsupported. +This may prevent classes from CLOS applications from being used with EIEIO +since EIEIO does not support all CLOS tags.") + +(defvar eieio-skip-typecheck nil + "*If non-nil, skip all slot typechecking. +Set this to t permanently if a program is functioning well to get a +small speed increase. This variable is also used internally to handle +default setting for optimization purposes.") + +(defvar eieio-optimize-primary-methods-flag t + "Non-nil means to optimize the method dispatch on primary methods.") + +;; State Variables +;; FIXME: These two constants below should have an `eieio-' prefix added!! +(defvar this nil + "Inside a method, this variable is the object in question. +DO NOT SET THIS YOURSELF unless you are trying to simulate friendly slots. + +Note: Embedded methods are no longer supported. The variable THIS is +still set for CLOS methods for the sake of routines like +`call-next-method'.") + +(defvar scoped-class nil + "This is set to a class when a method is running. +This is so we know we are allowed to check private parts or how to +execute a `call-next-method'. DO NOT SET THIS YOURSELF!") + +(defvar eieio-initializing-object nil + "Set to non-nil while initializing an object.") + +(defconst eieio-unbound + (if (and (boundp 'eieio-unbound) (symbolp eieio-unbound)) + eieio-unbound + (make-symbol "unbound")) + "Uninterned symbol representing an unbound slot in an object.") + +;; This is a bootstrap for eieio-default-superclass so it has a value +;; while it is being built itself. +(defvar eieio-default-superclass nil) + +;; FIXME: The constants below should have an `eieio-' prefix added!! +(defconst class-symbol 1 "Class's symbol (self-referencing.).") +(defconst class-parent 2 "Class parent slot.") +(defconst class-children 3 "Class children class slot.") +(defconst class-symbol-obarray 4 "Obarray permitting fast access to variable position indexes.") +;; @todo +;; the word "public" here is leftovers from the very first version. +;; Get rid of it! +(defconst class-public-a 5 "Class attribute index.") +(defconst class-public-d 6 "Class attribute defaults index.") +(defconst class-public-doc 7 "Class documentation strings for attributes.") +(defconst class-public-type 8 "Class type for a slot.") +(defconst class-public-custom 9 "Class custom type for a slot.") +(defconst class-public-custom-label 10 "Class custom group for a slot.") +(defconst class-public-custom-group 11 "Class custom group for a slot.") +(defconst class-public-printer 12 "Printer for a slot.") +(defconst class-protection 13 "Class protection for a slot.") +(defconst class-initarg-tuples 14 "Class initarg tuples list.") +(defconst class-class-allocation-a 15 "Class allocated attributes.") +(defconst class-class-allocation-doc 16 "Class allocated documentation.") +(defconst class-class-allocation-type 17 "Class allocated value type.") +(defconst class-class-allocation-custom 18 "Class allocated custom descriptor.") +(defconst class-class-allocation-custom-label 19 "Class allocated custom descriptor.") +(defconst class-class-allocation-custom-group 20 "Class allocated custom group.") +(defconst class-class-allocation-printer 21 "Class allocated printer for a slot.") +(defconst class-class-allocation-protection 22 "Class allocated protection list.") +(defconst class-class-allocation-values 23 "Class allocated value vector.") +(defconst class-default-object-cache 24 + "Cache index of what a newly created object would look like. +This will speed up instantiation time as only a `copy-sequence' will +be needed, instead of looping over all the values and setting them +from the default.") +(defconst class-options 25 + "Storage location of tagged class options. +Stored outright without modifications or stripping.") + +(defconst class-num-slots 26 + "Number of slots in the class definition object.") + +(defconst object-class 1 "Index in an object vector where the class is stored.") +(defconst object-name 2 "Index in an object where the name is stored.") + +(defconst method-static 0 "Index into :static tag on a method.") +(defconst method-before 1 "Index into :before tag on a method.") +(defconst method-primary 2 "Index into :primary tag on a method.") +(defconst method-after 3 "Index into :after tag on a method.") +(defconst method-num-lists 4 "Number of indexes into methods vector in which groups of functions are kept.") +(defconst method-generic-before 4 "Index into generic :before tag on a method.") +(defconst method-generic-primary 5 "Index into generic :primary tag on a method.") +(defconst method-generic-after 6 "Index into generic :after tag on a method.") +(defconst method-num-slots 7 "Number of indexes into a method's vector.") + +(defsubst eieio-specialized-key-to-generic-key (key) + "Convert a specialized KEY into a generic method key." + (cond ((eq key method-static) 0) ;; don't convert + ((< key method-num-lists) (+ key 3)) ;; The conversion + (t key) ;; already generic.. maybe. + )) + + +;;; Important macros used in eieio. +;; +(defmacro class-v (class) + "Internal: Return the class vector from the CLASS symbol." + ;; No check: If eieio gets this far, it's probably been checked already. + `(get ,class 'eieio-class-definition)) + +(defmacro class-p (class) + "Return t if CLASS is a valid class vector. +CLASS is a symbol." + ;; this new method is faster since it doesn't waste time checking lots of + ;; things. + `(condition-case nil + (eq (aref (class-v ,class) 0) 'defclass) + (error nil))) + +(defmacro eieio-object-p (obj) + "Return non-nil if OBJ is an EIEIO object." + `(condition-case nil + (let ((tobj ,obj)) + (and (eq (aref tobj 0) 'object) + (class-p (aref tobj object-class)))) + (error nil))) +(defalias 'object-p 'eieio-object-p) + +(defmacro class-constructor (class) + "Return the symbol representing the constructor of CLASS." + `(aref (class-v ,class) class-symbol)) + +(defmacro generic-p (method) + "Return t if symbol METHOD is a generic function. +Only methods have the symbol `eieio-method-obarray' as a property +\(which contains a list of all bindings to that method type.)" + `(and (fboundp ,method) (get ,method 'eieio-method-obarray))) + +(defun generic-primary-only-p (method) + "Return t if symbol METHOD is a generic function with only primary methods. +Only methods have the symbol `eieio-method-obarray' as a property (which +contains a list of all bindings to that method type.) +Methods with only primary implementations are executed in an optimized way." + (and (generic-p method) + (let ((M (get method 'eieio-method-tree))) + (and (< 0 (length (aref M method-primary))) + (not (aref M method-static)) + (not (aref M method-before)) + (not (aref M method-after)) + (not (aref M method-generic-before)) + (not (aref M method-generic-primary)) + (not (aref M method-generic-after)))) + )) + +(defun generic-primary-only-one-p (method) + "Return t if symbol METHOD is a generic function with only primary methods. +Only methods have the symbol `eieio-method-obarray' as a property (which +contains a list of all bindings to that method type.) +Methods with only primary implementations are executed in an optimized way." + (and (generic-p method) + (let ((M (get method 'eieio-method-tree))) + (and (= 1 (length (aref M method-primary))) + (not (aref M method-static)) + (not (aref M method-before)) + (not (aref M method-after)) + (not (aref M method-generic-before)) + (not (aref M method-generic-primary)) + (not (aref M method-generic-after)))) + )) + +(defmacro class-option-assoc (list option) + "Return from LIST the found OPTION, or nil if it doesn't exist." + `(car-safe (cdr (memq ,option ,list)))) + +(defmacro class-option (class option) + "Return the value stored for CLASS' OPTION. +Return nil if that option doesn't exist." + `(class-option-assoc (aref (class-v ,class) class-options) ',option)) + +(defmacro class-abstract-p (class) + "Return non-nil if CLASS is abstract. +Abstract classes cannot be instantiated." + `(class-option ,class :abstract)) + +(defmacro class-method-invocation-order (class) + "Return the invocation order of CLASS. +Abstract classes cannot be instantiated." + `(or (class-option ,class :method-invocation-order) + :breadth-first)) + + +;;; Defining a new class +;; +(defmacro defclass (name superclass slots &rest options-and-doc) + "Define NAME as a new class derived from SUPERCLASS with SLOTS. +OPTIONS-AND-DOC is used as the class' options and base documentation. +SUPERCLASS is a list of superclasses to inherit from, with SLOTS +being the slots residing in that class definition. NOTE: Currently +only one slot may exist in SUPERCLASS as multiple inheritance is not +yet supported. Supported tags are: + + :initform - Initializing form. + :initarg - Tag used during initialization. + :accessor - Tag used to create a function to access this slot. + :allocation - Specify where the value is stored. + Defaults to `:instance', but could also be `:class'. + :writer - A function symbol which will `write' an object's slot. + :reader - A function symbol which will `read' an object. + :type - The type of data allowed in this slot (see `typep'). + :documentation + - A string documenting use of this slot. + +The following are extensions on CLOS: + :protection - Specify protection for this slot. + Defaults to `:public'. Also use `:protected', or `:private'. + :custom - When customizing an object, the custom :type. Public only. + :label - A text string label used for a slot when customizing. + :group - Name of a customization group this slot belongs in. + :printer - A function to call to print the value of a slot. + See `eieio-override-prin1' as an example. + +A class can also have optional options. These options happen in place +of documentation (including a :documentation tag), in addition to +documentation, or not at all. Supported options are: + + :documentation - The doc-string used for this class. + +Options added to EIEIO: + + :allow-nil-initform - Non-nil to skip typechecking of null initforms. + :custom-groups - List of custom group names. Organizes slots into + reasonable groups for customizations. + :abstract - Non-nil to prevent instances of this class. + If a string, use as an error string if someone does + try to make an instance. + :method-invocation-order + - Control the method invocation order if there is + multiple inheritance. Valid values are: + :breadth-first - The default. + :depth-first + +Options in CLOS not supported in EIEIO: + + :metaclass - Class to use in place of `standard-class' + :default-initargs - Initargs to use when initializing new objects of + this class. + +Due to the way class options are set up, you can add any tags you wish, +and reference them using the function `class-option'." + ;; We must `eval-and-compile' this so that when we byte compile + ;; an eieio program, there is no need to load it ahead of time. + ;; It also provides lots of nice debugging errors at compile time. + `(eval-and-compile + (eieio-defclass ',name ',superclass ',slots ',options-and-doc))) + +(defvar eieio-defclass-autoload-map (make-vector 7 nil) + "Symbol map of superclasses we find in autoloads.") + +;; We autoload this because it's used in `make-autoload'. +;;;###autoload +(defun eieio-defclass-autoload (cname superclasses filename doc) + "Create autoload symbols for the EIEIO class CNAME. +SUPERCLASSES are the superclasses that CNAME inherits from. +DOC is the docstring for CNAME. +This function creates a mock-class for CNAME and adds it into +SUPERCLASSES as children. +It creates an autoload function for CNAME's constructor." + ;; Assume we've already debugged inputs. + + (let* ((oldc (when (class-p cname) (class-v cname))) + (newc (make-vector class-num-slots nil)) + ) + (if oldc + nil ;; Do nothing if we already have this class. + + ;; Create the class in NEWC, but don't fill anything else in. + (aset newc 0 'defclass) + (aset newc class-symbol cname) + + (let ((clear-parent nil)) + ;; No parents? + (when (not superclasses) + (setq superclasses '(eieio-default-superclass) + clear-parent t) + ) + + ;; Hook our new class into the existing structures so we can + ;; autoload it later. + (dolist (SC superclasses) + + + ;; TODO - If we create an autoload that is in the map, that + ;; map needs to be cleared! + + + ;; Does our parent exist? + (if (not (class-p SC)) + + ;; Create a symbol for this parent, and then store this + ;; parent on that symbol. + (let ((sym (intern (symbol-name SC) eieio-defclass-autoload-map))) + (if (not (boundp sym)) + (set sym (list cname)) + (add-to-list sym cname)) + ) + + ;; We have a parent, save the child in there. + (when (not (member cname (aref (class-v SC) class-children))) + (aset (class-v SC) class-children + (cons cname (aref (class-v SC) class-children))))) + + ;; save parent in child + (aset newc class-parent (cons SC (aref newc class-parent))) + ) + + ;; turn this into a useable self-pointing symbol + (set cname cname) + + ;; Store the new class vector definition into the symbol. We need to + ;; do this first so that we can call defmethod for the accessor. + ;; The vector will be updated by the following while loop and will not + ;; need to be stored a second time. + (put cname 'eieio-class-definition newc) + + ;; Clear the parent + (if clear-parent (aset newc class-parent nil)) + + ;; Create an autoload on top of our constructor function. + (autoload cname filename doc nil nil) + (autoload (intern (concat (symbol-name cname) "-p")) filename "" nil nil) + (autoload (intern (concat (symbol-name cname) "-child-p")) filename "" nil nil) + + )))) + +(defsubst eieio-class-un-autoload (cname) + "If class CNAME is in an autoload state, load its file." + (when (eq (car-safe (symbol-function cname)) 'autoload) + (load-library (car (cdr (symbol-function cname)))))) + +(defun eieio-defclass (cname superclasses slots options-and-doc) + ;; FIXME: Most of this should be moved to the `defclass' macro. + "Define CNAME as a new subclass of SUPERCLASSES. +SLOTS are the slots residing in that class definition, and options or +documentation OPTIONS-AND-DOC is the toplevel documentation for this class. +See `defclass' for more information." + ;; Run our eieio-hook each time, and clear it when we are done. + ;; This way people can add hooks safely if they want to modify eieio + ;; or add definitions when eieio is loaded or something like that. + (run-hooks 'eieio-hook) + (setq eieio-hook nil) + + (if (not (symbolp cname)) (signal 'wrong-type-argument '(symbolp cname))) + (if (not (listp superclasses)) (signal 'wrong-type-argument '(listp superclasses))) + + (let* ((pname (if superclasses superclasses nil)) + (newc (make-vector class-num-slots nil)) + (oldc (when (class-p cname) (class-v cname))) + (groups nil) ;; list of groups id'd from slots + (options nil) + (clearparent nil)) + + (aset newc 0 'defclass) + (aset newc class-symbol cname) + + ;; If this class already existed, and we are updating its structure, + ;; make sure we keep the old child list. This can cause bugs, but + ;; if no new slots are created, it also saves time, and prevents + ;; method table breakage, particularly when the users is only + ;; byte compiling an EIEIO file. + (if oldc + (aset newc class-children (aref oldc class-children)) + ;; If the old class did not exist, but did exist in the autoload map, then adopt those children. + ;; This is like the above, but deals with autoloads nicely. + (let ((sym (intern-soft (symbol-name cname) eieio-defclass-autoload-map))) + (when sym + (condition-case nil + (aset newc class-children (symbol-value sym)) + (error nil)) + (unintern (symbol-name cname) eieio-defclass-autoload-map) + )) + ) + + (cond ((and (stringp (car options-and-doc)) + (/= 1 (% (length options-and-doc) 2))) + (error "Too many arguments to `defclass'")) + ((and (symbolp (car options-and-doc)) + (/= 0 (% (length options-and-doc) 2))) + (error "Too many arguments to `defclass'")) + ) + + (setq options + (if (stringp (car options-and-doc)) + (cons :documentation options-and-doc) + options-and-doc)) + + (if pname + (progn + (while pname + (if (and (car pname) (symbolp (car pname))) + (if (not (class-p (car pname))) + ;; bad class + (error "Given parent class %s is not a class" (car pname)) + ;; good parent class... + ;; save new child in parent + (when (not (member cname (aref (class-v (car pname)) class-children))) + (aset (class-v (car pname)) class-children + (cons cname (aref (class-v (car pname)) class-children)))) + ;; Get custom groups, and store them into our local copy. + (mapc (lambda (g) (add-to-list 'groups g)) + (class-option (car pname) :custom-groups)) + ;; save parent in child + (aset newc class-parent (cons (car pname) (aref newc class-parent)))) + (error "Invalid parent class %s" pname)) + (setq pname (cdr pname))) + ;; Reverse the list of our parents so that they are prioritized in + ;; the same order as specified in the code. + (aset newc class-parent (nreverse (aref newc class-parent))) ) + ;; If there is nothing to loop over, then inherit from the + ;; default superclass. + (unless (eq cname 'eieio-default-superclass) + ;; adopt the default parent here, but clear it later... + (setq clearparent t) + ;; save new child in parent + (if (not (member cname (aref (class-v 'eieio-default-superclass) class-children))) + (aset (class-v 'eieio-default-superclass) class-children + (cons cname (aref (class-v 'eieio-default-superclass) class-children)))) + ;; save parent in child + (aset newc class-parent (list eieio-default-superclass)))) + + ;; turn this into a useable self-pointing symbol + (set cname cname) + + ;; These two tests must be created right away so we can have self- + ;; referencing classes. ei, a class whose slot can contain only + ;; pointers to itself. + + ;; Create the test function + (let ((csym (intern (concat (symbol-name cname) "-p")))) + (fset csym + (list 'lambda (list 'obj) + (format "Test OBJ to see if it an object of type %s" cname) + (list 'and '(eieio-object-p obj) + (list 'same-class-p 'obj cname))))) + + ;; Make sure the method invocation order is a valid value. + (let ((io (class-option-assoc options :method-invocation-order))) + (when (and io (not (member io '(:depth-first :breadth-first :c3)))) + (error "Method invocation order %s is not allowed" io) + )) + + ;; Create a handy child test too + (let ((csym (intern (concat (symbol-name cname) "-child-p")))) + (fset csym + `(lambda (obj) + ,(format + "Test OBJ to see if it an object is a child of type %s" + cname) + (and (eieio-object-p obj) + (object-of-class-p obj ,cname)))) + + ;; When using typep, (typep OBJ 'myclass) returns t for objects which + ;; are subclasses of myclass. For our predicates, however, it is + ;; important for EIEIO to be backwards compatible, where + ;; myobject-p, and myobject-child-p are different. + ;; "cl" uses this technique to specify symbols with specific typep + ;; test, so we can let typep have the CLOS documented behavior + ;; while keeping our above predicate clean. + + ;; It would be cleaner to use `defsetf' here, but that requires cl + ;; at runtime. + (put cname 'cl-deftype-handler + (list 'lambda () `(list 'satisfies (quote ,csym))))) + + ;; before adding new slots, lets add all the methods and classes + ;; in from the parent class + (eieio-copy-parents-into-subclass newc superclasses) + + ;; Store the new class vector definition into the symbol. We need to + ;; do this first so that we can call defmethod for the accessor. + ;; The vector will be updated by the following while loop and will not + ;; need to be stored a second time. + (put cname 'eieio-class-definition newc) + + ;; Query each slot in the declaration list and mangle into the + ;; class structure I have defined. + (while slots + (let* ((slot1 (car slots)) + (name (car slot1)) + (slot (cdr slot1)) + (acces (plist-get slot ':accessor)) + (init (or (plist-get slot ':initform) + (if (member ':initform slot) nil + eieio-unbound))) + (initarg (plist-get slot ':initarg)) + (docstr (plist-get slot ':documentation)) + (prot (plist-get slot ':protection)) + (reader (plist-get slot ':reader)) + (writer (plist-get slot ':writer)) + (alloc (plist-get slot ':allocation)) + (type (plist-get slot ':type)) + (custom (plist-get slot ':custom)) + (label (plist-get slot ':label)) + (customg (plist-get slot ':group)) + (printer (plist-get slot ':printer)) + + (skip-nil (class-option-assoc options :allow-nil-initform)) + ) + + (if eieio-error-unsupported-class-tags + (let ((tmp slot)) + (while tmp + (if (not (member (car tmp) '(:accessor + :initform + :initarg + :documentation + :protection + :reader + :writer + :allocation + :type + :custom + :label + :group + :printer + :allow-nil-initform + :custom-groups))) + (signal 'invalid-slot-type (list (car tmp)))) + (setq tmp (cdr (cdr tmp)))))) + + ;; Clean up the meaning of protection. + (cond ((or (eq prot 'public) (eq prot :public)) (setq prot nil)) + ((or (eq prot 'protected) (eq prot :protected)) (setq prot 'protected)) + ((or (eq prot 'private) (eq prot :private)) (setq prot 'private)) + ((eq prot nil) nil) + (t (signal 'invalid-slot-type (list ':protection prot)))) + + ;; Make sure the :allocation parameter has a valid value. + (if (not (or (not alloc) (eq alloc :class) (eq alloc :instance))) + (signal 'invalid-slot-type (list ':allocation alloc))) + + ;; The default type specifier is supposed to be t, meaning anything. + (if (not type) (setq type t)) + + ;; Label is nil, or a string + (if (not (or (null label) (stringp label))) + (signal 'invalid-slot-type (list ':label label))) + + ;; Is there an initarg, but allocation of class? + (if (and initarg (eq alloc :class)) + (message "Class allocated slots do not need :initarg")) + + ;; intern the symbol so we can use it blankly + (if initarg (set initarg initarg)) + + ;; The customgroup should be a list of symbols + (cond ((null customg) + (setq customg '(default))) + ((not (listp customg)) + (setq customg (list customg)))) + ;; The customgroup better be a symbol, or list of symbols. + (mapc (lambda (cg) + (if (not (symbolp cg)) + (signal 'invalid-slot-type (list ':group cg)))) + customg) + + ;; First up, add this slot into our new class. + (eieio-add-new-slot newc name init docstr type custom label customg printer + prot initarg alloc 'defaultoverride skip-nil) + + ;; We need to id the group, and store them in a group list attribute. + (mapc (lambda (cg) (add-to-list 'groups cg)) customg) + + ;; anyone can have an accessor function. This creates a function + ;; of the specified name, and also performs a `defsetf' if applicable + ;; so that users can `setf' the space returned by this function + (if acces + (progn + (eieio--defmethod + acces (if (eq alloc :class) :static :primary) cname + `(lambda (this) + ,(format + "Retrieves the slot `%s' from an object of class `%s'" + name cname) + (if (slot-boundp this ',name) + (eieio-oref this ',name) + ;; Else - Some error? nil? + nil))) + + ;; Provide a setf method. It would be cleaner to use + ;; defsetf, but that would require CL at runtime. + (put acces 'setf-method + `(lambda (widget) + (let* ((--widget-sym-- (make-symbol "--widget--")) + (--store-sym-- (make-symbol "--store--"))) + (list + (list --widget-sym--) + (list widget) + (list --store-sym--) + (list 'eieio-oset --widget-sym-- '',name --store-sym--) + (list 'getfoo --widget-sym--))))))) + + ;; If a writer is defined, then create a generic method of that + ;; name whose purpose is to set the value of the slot. + (if writer + (eieio--defmethod + writer nil cname + `(lambda (this value) + ,(format "Set the slot `%s' of an object of class `%s'" + name cname) + (setf (slot-value this ',name) value)))) + ;; If a reader is defined, then create a generic method + ;; of that name whose purpose is to access this slot value. + (if reader + (eieio--defmethod + reader nil cname + `(lambda (this) + ,(format "Access the slot `%s' from object of class `%s'" + name cname) + (slot-value this ',name)))) + ) + (setq slots (cdr slots))) + + ;; Now that everything has been loaded up, all our lists are backwards! Fix that up now. + (aset newc class-public-a (nreverse (aref newc class-public-a))) + (aset newc class-public-d (nreverse (aref newc class-public-d))) + (aset newc class-public-doc (nreverse (aref newc class-public-doc))) + (aset newc class-public-type + (apply 'vector (nreverse (aref newc class-public-type)))) + (aset newc class-public-custom (nreverse (aref newc class-public-custom))) + (aset newc class-public-custom-label (nreverse (aref newc class-public-custom-label))) + (aset newc class-public-custom-group (nreverse (aref newc class-public-custom-group))) + (aset newc class-public-printer (nreverse (aref newc class-public-printer))) + (aset newc class-protection (nreverse (aref newc class-protection))) + (aset newc class-initarg-tuples (nreverse (aref newc class-initarg-tuples))) + + ;; The storage for class-class-allocation-type needs to be turned into + ;; a vector now. + (aset newc class-class-allocation-type + (apply 'vector (aref newc class-class-allocation-type))) + + ;; Also, take class allocated values, and vectorize them for speed. + (aset newc class-class-allocation-values + (apply 'vector (aref newc class-class-allocation-values))) + + ;; Attach slot symbols into an obarray, and store the index of + ;; this slot as the variable slot in this new symbol. We need to + ;; know about primes, because obarrays are best set in vectors of + ;; prime number length, and we also need to make our vector small + ;; to save space, and also optimal for the number of items we have. + (let* ((cnt 0) + (pubsyms (aref newc class-public-a)) + (prots (aref newc class-protection)) + (l (length pubsyms)) + (vl (let ((primes '( 3 5 7 11 13 17 19 23 29 31 37 41 43 47 + 53 59 61 67 71 73 79 83 89 97 101 ))) + (while (and primes (< (car primes) l)) + (setq primes (cdr primes))) + (car primes))) + (oa (make-vector vl 0)) + (newsym)) + (while pubsyms + (setq newsym (intern (symbol-name (car pubsyms)) oa)) + (set newsym cnt) + (setq cnt (1+ cnt)) + (if (car prots) (put newsym 'protection (car prots))) + (setq pubsyms (cdr pubsyms) + prots (cdr prots))) + (aset newc class-symbol-obarray oa) + ) + + ;; Create the constructor function + (if (class-option-assoc options :abstract) + ;; Abstract classes cannot be instantiated. Say so. + (let ((abs (class-option-assoc options :abstract))) + (if (not (stringp abs)) + (setq abs (format "Class %s is abstract" cname))) + (fset cname + `(lambda (&rest stuff) + ,(format "You cannot create a new object of type %s" cname) + (error ,abs)))) + + ;; Non-abstract classes need a constructor. + (fset cname + `(lambda (newname &rest slots) + ,(format "Create a new object with name NAME of class type %s" cname) + (apply 'constructor ,cname newname slots))) + ) + + ;; Set up a specialized doc string. + ;; Use stored value since it is calculated in a non-trivial way + (put cname 'variable-documentation + (class-option-assoc options :documentation)) + + ;; We have a list of custom groups. Store them into the options. + (let ((g (class-option-assoc options :custom-groups))) + (mapc (lambda (cg) (add-to-list 'g cg)) groups) + (if (memq :custom-groups options) + (setcar (cdr (memq :custom-groups options)) g) + (setq options (cons :custom-groups (cons g options))))) + + ;; Set up the options we have collected. + (aset newc class-options options) + + ;; if this is a superclass, clear out parent (which was set to the + ;; default superclass eieio-default-superclass) + (if clearparent (aset newc class-parent nil)) + + ;; Create the cached default object. + (let ((cache (make-vector (+ (length (aref newc class-public-a)) + 3) nil))) + (aset cache 0 'object) + (aset cache object-class cname) + (aset cache object-name 'default-cache-object) + (let ((eieio-skip-typecheck t)) + ;; All type-checking has been done to our satisfaction + ;; before this call. Don't waste our time in this call.. + (eieio-set-defaults cache t)) + (aset newc class-default-object-cache cache)) + + ;; Return our new class object + ;; newc + cname + )) + +(defun eieio-perform-slot-validation-for-default (slot spec value skipnil) + "For SLOT, signal if SPEC does not match VALUE. +If SKIPNIL is non-nil, then if VALUE is nil return t instead." + (if (and (not (eieio-eval-default-p value)) + (not eieio-skip-typecheck) + (not (and skipnil (null value))) + (not (eieio-perform-slot-validation spec value))) + (signal 'invalid-slot-type (list slot spec value)))) + +(defun eieio-add-new-slot (newc a d doc type cust label custg print prot init alloc + &optional defaultoverride skipnil) + "Add into NEWC attribute A. +If A already exists in NEWC, then do nothing. If it doesn't exist, +then also add in D (default), DOC, TYPE, CUST, LABEL, CUSTG, PRINT, PROT, and INIT arg. +Argument ALLOC specifies if the slot is allocated per instance, or per class. +If optional DEFAULTOVERRIDE is non-nil, then if A exists in NEWC, +we must override its value for a default. +Optional argument SKIPNIL indicates if type checking should be skipped +if default value is nil." + ;; Make sure we duplicate those items that are sequences. + (condition-case nil + (if (sequencep d) (setq d (copy-sequence d))) + ;; This copy can fail on a cons cell with a non-cons in the cdr. Lets skip it if it doesn't work. + (error nil)) + (if (sequencep type) (setq type (copy-sequence type))) + (if (sequencep cust) (setq cust (copy-sequence cust))) + (if (sequencep custg) (setq custg (copy-sequence custg))) + + ;; To prevent override information w/out specification of storage, + ;; we need to do this little hack. + (if (member a (aref newc class-class-allocation-a)) (setq alloc ':class)) + + (if (or (not alloc) (and (symbolp alloc) (eq alloc ':instance))) + ;; In this case, we modify the INSTANCE version of a given slot. + + (progn + + ;; Only add this element if it is so-far unique + (if (not (member a (aref newc class-public-a))) + (progn + (eieio-perform-slot-validation-for-default a type d skipnil) + (aset newc class-public-a (cons a (aref newc class-public-a))) + (aset newc class-public-d (cons d (aref newc class-public-d))) + (aset newc class-public-doc (cons doc (aref newc class-public-doc))) + (aset newc class-public-type (cons type (aref newc class-public-type))) + (aset newc class-public-custom (cons cust (aref newc class-public-custom))) + (aset newc class-public-custom-label (cons label (aref newc class-public-custom-label))) + (aset newc class-public-custom-group (cons custg (aref newc class-public-custom-group))) + (aset newc class-public-printer (cons print (aref newc class-public-printer))) + (aset newc class-protection (cons prot (aref newc class-protection))) + (aset newc class-initarg-tuples (cons (cons init a) (aref newc class-initarg-tuples))) + ) + ;; When defaultoverride is true, we are usually adding new local + ;; attributes which must override the default value of any slot + ;; passed in by one of the parent classes. + (when defaultoverride + ;; There is a match, and we must override the old value. + (let* ((ca (aref newc class-public-a)) + (np (member a ca)) + (num (- (length ca) (length np))) + (dp (if np (nthcdr num (aref newc class-public-d)) + nil)) + (tp (if np (nth num (aref newc class-public-type)))) + ) + (if (not np) + (error "EIEIO internal error overriding default value for %s" + a) + ;; If type is passed in, is it the same? + (if (not (eq type t)) + (if (not (equal type tp)) + (error + "Child slot type `%s' does not match inherited type `%s' for `%s'" + type tp a))) + ;; If we have a repeat, only update the initarg... + (unless (eq d eieio-unbound) + (eieio-perform-slot-validation-for-default a tp d skipnil) + (setcar dp d)) + ;; If we have a new initarg, check for it. + (when init + (let* ((inits (aref newc class-initarg-tuples)) + (inita (rassq a inits))) + ;; Replace the CAR of the associate INITA. + ;;(message "Initarg: %S replace %s" inita init) + (setcar inita init) + )) + + ;; PLN Tue Jun 26 11:57:06 2007 : The protection is + ;; checked and SHOULD match the superclass + ;; protection. Otherwise an error is thrown. However + ;; I wonder if a more flexible schedule might be + ;; implemented. + ;; + ;; EML - We used to have (if prot... here, + ;; but a prot of 'nil means public. + ;; + (let ((super-prot (nth num (aref newc class-protection))) + ) + (if (not (eq prot super-prot)) + (error "Child slot protection `%s' does not match inherited protection `%s' for `%s'" + prot super-prot a))) + ;; End original PLN + + ;; PLN Tue Jun 26 11:57:06 2007 : + ;; Do a non redundant combination of ancient custom + ;; groups and new ones. + (when custg + (let* ((groups + (nthcdr num (aref newc class-public-custom-group))) + (list1 (car groups)) + (list2 (if (listp custg) custg (list custg)))) + (if (< (length list1) (length list2)) + (setq list1 (prog1 list2 (setq list2 list1)))) + (dolist (elt list2) + (unless (memq elt list1) + (push elt list1))) + (setcar groups list1))) + ;; End PLN + + ;; PLN Mon Jun 25 22:44:34 2007 : If a new cust is + ;; set, simply replaces the old one. + (when cust + ;; (message "Custom type redefined to %s" cust) + (setcar (nthcdr num (aref newc class-public-custom)) cust)) + + ;; If a new label is specified, it simply replaces + ;; the old one. + (when label + ;; (message "Custom label redefined to %s" label) + (setcar (nthcdr num (aref newc class-public-custom-label)) label)) + ;; End PLN + + ;; PLN Sat Jun 30 17:24:42 2007 : when a new + ;; doc is specified, simply replaces the old one. + (when doc + ;;(message "Documentation redefined to %s" doc) + (setcar (nthcdr num (aref newc class-public-doc)) + doc)) + ;; End PLN + + ;; If a new printer is specified, it simply replaces + ;; the old one. + (when print + ;; (message "printer redefined to %s" print) + (setcar (nthcdr num (aref newc class-public-printer)) print)) + + ))) + )) + + ;; CLASS ALLOCATED SLOTS + (let ((value (eieio-default-eval-maybe d))) + (if (not (member a (aref newc class-class-allocation-a))) + (progn + (eieio-perform-slot-validation-for-default a type value skipnil) + ;; Here we have found a :class version of a slot. This + ;; requires a very different aproach. + (aset newc class-class-allocation-a (cons a (aref newc class-class-allocation-a))) + (aset newc class-class-allocation-doc (cons doc (aref newc class-class-allocation-doc))) + (aset newc class-class-allocation-type (cons type (aref newc class-class-allocation-type))) + (aset newc class-class-allocation-custom (cons cust (aref newc class-class-allocation-custom))) + (aset newc class-class-allocation-custom-label (cons label (aref newc class-class-allocation-custom-label))) + (aset newc class-class-allocation-custom-group (cons custg (aref newc class-class-allocation-custom-group))) + (aset newc class-class-allocation-protection (cons prot (aref newc class-class-allocation-protection))) + ;; Default value is stored in the 'values section, since new objects + ;; can't initialize from this element. + (aset newc class-class-allocation-values (cons value (aref newc class-class-allocation-values)))) + (when defaultoverride + ;; There is a match, and we must override the old value. + (let* ((ca (aref newc class-class-allocation-a)) + (np (member a ca)) + (num (- (length ca) (length np))) + (dp (if np + (nthcdr num + (aref newc class-class-allocation-values)) + nil)) + (tp (if np (nth num (aref newc class-class-allocation-type)) + nil))) + (if (not np) + (error "EIEIO internal error overriding default value for %s" + a) + ;; If type is passed in, is it the same? + (if (not (eq type t)) + (if (not (equal type tp)) + (error + "Child slot type `%s' does not match inherited type `%s' for `%s'" + type tp a))) + ;; EML - Note: the only reason to override a class bound slot + ;; is to change the default, so allow unbound in. + + ;; If we have a repeat, only update the vlaue... + (eieio-perform-slot-validation-for-default a tp value skipnil) + (setcar dp value)) + + ;; PLN Tue Jun 26 11:57:06 2007 : The protection is + ;; checked and SHOULD match the superclass + ;; protection. Otherwise an error is thrown. However + ;; I wonder if a more flexible schedule might be + ;; implemented. + (let ((super-prot + (car (nthcdr num (aref newc class-class-allocation-protection))))) + (if (not (eq prot super-prot)) + (error "Child slot protection `%s' does not match inherited protection `%s' for `%s'" + prot super-prot a))) + ;; Do a non redundant combination of ancient custom groups + ;; and new ones. + (when custg + (let* ((groups + (nthcdr num (aref newc class-class-allocation-custom-group))) + (list1 (car groups)) + (list2 (if (listp custg) custg (list custg)))) + (if (< (length list1) (length list2)) + (setq list1 (prog1 list2 (setq list2 list1)))) + (dolist (elt list2) + (unless (memq elt list1) + (push elt list1))) + (setcar groups list1))) + + ;; PLN Sat Jun 30 17:24:42 2007 : when a new + ;; doc is specified, simply replaces the old one. + (when doc + ;;(message "Documentation redefined to %s" doc) + (setcar (nthcdr num (aref newc class-class-allocation-doc)) + doc)) + ;; End PLN + + ;; If a new printer is specified, it simply replaces + ;; the old one. + (when print + ;; (message "printer redefined to %s" print) + (setcar (nthcdr num (aref newc class-class-allocation-printer)) print)) + + )) + )) + )) + +(defun eieio-copy-parents-into-subclass (newc parents) + "Copy into NEWC the slots of PARENTS. +Follow the rules of not overwriting early parents when applying to +the new child class." + (let ((ps (aref newc class-parent)) + (sn (class-option-assoc (aref newc class-options) + ':allow-nil-initform))) + (while ps + ;; First, duplicate all the slots of the parent. + (let ((pcv (class-v (car ps)))) + (let ((pa (aref pcv class-public-a)) + (pd (aref pcv class-public-d)) + (pdoc (aref pcv class-public-doc)) + (ptype (aref pcv class-public-type)) + (pcust (aref pcv class-public-custom)) + (plabel (aref pcv class-public-custom-label)) + (pcustg (aref pcv class-public-custom-group)) + (printer (aref pcv class-public-printer)) + (pprot (aref pcv class-protection)) + (pinit (aref pcv class-initarg-tuples)) + (i 0)) + (while pa + (eieio-add-new-slot newc + (car pa) (car pd) (car pdoc) (aref ptype i) + (car pcust) (car plabel) (car pcustg) + (car printer) + (car pprot) (car-safe (car pinit)) nil nil sn) + ;; Increment each value. + (setq pa (cdr pa) + pd (cdr pd) + pdoc (cdr pdoc) + i (1+ i) + pcust (cdr pcust) + plabel (cdr plabel) + pcustg (cdr pcustg) + printer (cdr printer) + pprot (cdr pprot) + pinit (cdr pinit)) + )) ;; while/let + ;; Now duplicate all the class alloc slots. + (let ((pa (aref pcv class-class-allocation-a)) + (pdoc (aref pcv class-class-allocation-doc)) + (ptype (aref pcv class-class-allocation-type)) + (pcust (aref pcv class-class-allocation-custom)) + (plabel (aref pcv class-class-allocation-custom-label)) + (pcustg (aref pcv class-class-allocation-custom-group)) + (printer (aref pcv class-class-allocation-printer)) + (pprot (aref pcv class-class-allocation-protection)) + (pval (aref pcv class-class-allocation-values)) + (i 0)) + (while pa + (eieio-add-new-slot newc + (car pa) (aref pval i) (car pdoc) (aref ptype i) + (car pcust) (car plabel) (car pcustg) + (car printer) + (car pprot) nil ':class sn) + ;; Increment each value. + (setq pa (cdr pa) + pdoc (cdr pdoc) + pcust (cdr pcust) + plabel (cdr plabel) + pcustg (cdr pcustg) + printer (cdr printer) + pprot (cdr pprot) + i (1+ i)) + ))) ;; while/let + ;; Loop over each parent class + (setq ps (cdr ps))) + )) + +;;; CLOS style implementation of object creators. +;; +(defun make-instance (class &rest initargs) + "Make a new instance of CLASS based on INITARGS. +CLASS is a class symbol. For example: + + (make-instance 'foo) + + INITARGS is a property list with keywords based on the :initarg +for each slot. For example: + + (make-instance 'foo :slot1 value1 :slotN valueN) + +Compatibility note: + +If the first element of INITARGS is a string, it is used as the +name of the class. + +In EIEIO, the class' constructor requires a name for use when printing. +`make-instance' in CLOS doesn't use names the way Emacs does, so the +class is used as the name slot instead when INITARGS doesn't start with +a string." + (if (and (car initargs) (stringp (car initargs))) + (apply (class-constructor class) initargs) + (apply (class-constructor class) + (cond ((symbolp class) (symbol-name class)) + (t (format "%S" class))) + initargs))) + + +;;; CLOS methods and generics +;; + +(put 'eieio--defalias 'byte-hunk-handler + #'byte-compile-file-form-defalias) ;;(get 'defalias 'byte-hunk-handler) +(defun eieio--defalias (name body) + "Like `defalias', but with less side-effects. +More specifically, it has no side-effects at all when the new function +definition is the same (`eq') as the old one." + (unless (and (fboundp name) + (eq (symbol-function name) body)) + (defalias name body))) + +(defmacro defgeneric (method args &optional doc-string) + "Create a generic function METHOD. +DOC-STRING is the base documentation for this class. A generic +function has no body, as its purpose is to decide which method body +is appropriate to use. Uses `defmethod' to create methods, and calls +`defgeneric' for you. With this implementation the ARGS are +currently ignored. You can use `defgeneric' to apply specialized +top level documentation to a method." + `(eieio--defalias ',method + (eieio--defgeneric-init-form ',method ,doc-string))) + +(defun eieio--defgeneric-init-form (method doc-string) + "Form to use for the initial definition of a generic." + (cond + ((or (not (fboundp method)) + (eq 'autoload (car-safe (symbol-function method)))) + ;; Make sure the method tables are installed. + (eieiomt-install method) + ;; Construct the actual body of this function. + (eieio-defgeneric-form method doc-string)) + ((generic-p method) (symbol-function method)) ;Leave it as-is. + (t (error "You cannot create a generic/method over an existing symbol: %s" + method)))) + +(defun eieio-defgeneric-form (method doc-string) + "The lambda form that would be used as the function defined on METHOD. +All methods should call the same EIEIO function for dispatch. +DOC-STRING is the documentation attached to METHOD." + `(lambda (&rest local-args) + ,doc-string + (eieio-generic-call (quote ,method) local-args))) + +(defsubst eieio-defgeneric-reset-generic-form (method) + "Setup METHOD to call the generic form." + (let ((doc-string (documentation method))) + (fset method (eieio-defgeneric-form method doc-string)))) + +(defun eieio-defgeneric-form-primary-only (method doc-string) + "The lambda form that would be used as the function defined on METHOD. +All methods should call the same EIEIO function for dispatch. +DOC-STRING is the documentation attached to METHOD." + `(lambda (&rest local-args) + ,doc-string + (eieio-generic-call-primary-only (quote ,method) local-args))) + +(defsubst eieio-defgeneric-reset-generic-form-primary-only (method) + "Setup METHOD to call the generic form." + (let ((doc-string (documentation method))) + (fset method (eieio-defgeneric-form-primary-only method doc-string)))) + +(defun eieio-defgeneric-form-primary-only-one (method doc-string + class + impl + ) + "The lambda form that would be used as the function defined on METHOD. +All methods should call the same EIEIO function for dispatch. +DOC-STRING is the documentation attached to METHOD. +CLASS is the class symbol needed for private method access. +IMPL is the symbol holding the method implementation." + ;; NOTE: I tried out byte compiling this little fcn. Turns out it + ;; is faster to execute this for not byte-compiled. ie, install this, + ;; then measure calls going through here. I wonder why. + (require 'bytecomp) + (let ((byte-compile-warnings nil)) + (byte-compile + `(lambda (&rest local-args) + ,doc-string + ;; This is a cool cheat. Usually we need to look up in the + ;; method table to find out if there is a method or not. We can + ;; instead make that determination at load time when there is + ;; only one method. If the first arg is not a child of the class + ;; of that one implementation, then clearly, there is no method def. + (if (not (eieio-object-p (car local-args))) + ;; Not an object. Just signal. + (signal 'no-method-definition + (list ',method local-args)) + + ;; We do have an object. Make sure it is the right type. + (if ,(if (eq class eieio-default-superclass) + nil ; default superclass means just an obj. Already asked. + `(not (child-of-class-p (aref (car local-args) object-class) + ',class))) + + ;; If not the right kind of object, call no applicable + (apply 'no-applicable-method (car local-args) + ',method local-args) + + ;; It is ok, do the call. + ;; Fill in inter-call variables then evaluate the method. + (let ((scoped-class ',class) + (eieio-generic-call-next-method-list nil) + (eieio-generic-call-key method-primary) + (eieio-generic-call-methodname ',method) + (eieio-generic-call-arglst local-args) + ) + (apply #',impl local-args) + ;;(,impl local-args) + ))))))) + +(defsubst eieio-defgeneric-reset-generic-form-primary-only-one (method) + "Setup METHOD to call the generic form." + (let* ((doc-string (documentation method)) + (M (get method 'eieio-method-tree)) + (entry (car (aref M method-primary))) + ) + (fset method (eieio-defgeneric-form-primary-only-one + method doc-string + (car entry) + (cdr entry) + )))) + +(defun eieio-unbind-method-implementations (method) + "Make the generic method METHOD have no implementations. +It will leave the original generic function in place, +but remove reference to all implementations of METHOD." + (put method 'eieio-method-tree nil) + (put method 'eieio-method-obarray nil)) + +(defmacro defmethod (method &rest args) + "Create a new METHOD through `defgeneric' with ARGS. + +The optional second argument KEY is a specifier that +modifies how the method is called, including: + :before - Method will be called before the :primary + :primary - The default if not specified + :after - Method will be called after the :primary + :static - First arg could be an object or class +The next argument is the ARGLIST. The ARGLIST specifies the arguments +to the method as with `defun'. The first argument can have a type +specifier, such as: + ((VARNAME CLASS) ARG2 ...) +where VARNAME is the name of the local variable for the method being +created. The CLASS is a class symbol for a class made with `defclass'. +A DOCSTRING comes after the ARGLIST, and is optional. +All the rest of the args are the BODY of the method. A method will +return the value of the last form in the BODY. + +Summary: + + (defmethod mymethod [:before | :primary | :after | :static] + ((typearg class-name) arg2 &optional opt &rest rest) + \"doc-string\" + body)" + (let* ((key (if (keywordp (car args)) (pop args))) + (params (car args)) + (arg1 (car params)) + (fargs (if (consp arg1) + (cons (car arg1) (cdr params)) + params)) + (class (if (consp arg1) (nth 1 arg1))) + (code `(lambda ,fargs ,@(cdr args)))) + `(progn + ;; Make sure there is a generic and the byte-compiler sees it. + (defgeneric ,method ,args + ,(or (documentation code) + (format "Generically created method `%s'." method))) + (eieio--defmethod ',method ',key ',class #',code)))) + +(defun eieio--defmethod (method kind argclass code) + "Work part of the `defmethod' macro defining METHOD with ARGS." + (let ((key + ;; find optional keys + (cond ((or (eq ':BEFORE kind) + (eq ':before kind)) + method-before) + ((or (eq ':AFTER kind) + (eq ':after kind)) + method-after) + ((or (eq ':PRIMARY kind) + (eq ':primary kind)) + method-primary) + ((or (eq ':STATIC kind) + (eq ':static kind)) + method-static) + ;; Primary key + (t method-primary)))) + ;; Make sure there is a generic (when called from defclass). + (eieio--defalias + method (eieio--defgeneric-init-form + method (or (documentation code) + (format "Generically created method `%s'." method)))) + ;; create symbol for property to bind to. If the first arg is of + ;; the form (varname vartype) and `vartype' is a class, then + ;; that class will be the type symbol. If not, then it will fall + ;; under the type `primary' which is a non-specific calling of the + ;; function. + (if argclass + (if (not (class-p argclass)) + (error "Unknown class type %s in method parameters" + argclass)) + (if (= key -1) + (signal 'wrong-type-argument (list :static 'non-class-arg))) + ;; generics are higher + (setq key (eieio-specialized-key-to-generic-key key))) + ;; Put this lambda into the symbol so we can find it + (eieiomt-add method code key argclass) + ) + + (when eieio-optimize-primary-methods-flag + ;; Optimizing step: + ;; + ;; If this method, after this setup, only has primary methods, then + ;; we can setup the generic that way. + (if (generic-primary-only-p method) + ;; If there is only one primary method, then we can go one more + ;; optimization step. + (if (generic-primary-only-one-p method) + (eieio-defgeneric-reset-generic-form-primary-only-one method) + (eieio-defgeneric-reset-generic-form-primary-only method)) + (eieio-defgeneric-reset-generic-form method))) + + method) + +;;; Slot type validation + +;; This is a hideous hack for replacing `typep' from cl-macs, to avoid +;; requiring the CL library at run-time. It can be eliminated if/when +;; `typep' is merged into Emacs core. +(defun eieio--typep (val type) + (if (symbolp type) + (cond ((get type 'cl-deftype-handler) + (eieio--typep val (funcall (get type 'cl-deftype-handler)))) + ((eq type t) t) + ((eq type 'null) (null val)) + ((eq type 'atom) (atom val)) + ((eq type 'float) (and (numberp val) (not (integerp val)))) + ((eq type 'real) (numberp val)) + ((eq type 'fixnum) (integerp val)) + ((memq type '(character string-char)) (characterp val)) + (t + (let* ((name (symbol-name type)) + (namep (intern (concat name "p")))) + (if (fboundp namep) + (funcall `(lambda () (,namep val))) + (funcall `(lambda () + (,(intern (concat name "-p")) val))))))) + (cond ((get (car type) 'cl-deftype-handler) + (eieio--typep val (apply (get (car type) 'cl-deftype-handler) + (cdr type)))) + ((memq (car type) '(integer float real number)) + (and (eieio--typep val (car type)) + (or (memq (cadr type) '(* nil)) + (if (consp (cadr type)) + (> val (car (cadr type))) + (>= val (cadr type)))) + (or (memq (caddr type) '(* nil)) + (if (consp (car (cddr type))) + (< val (caar (cddr type))) + (<= val (car (cddr type))))))) + ((memq (car type) '(and or not)) + (eval (cons (car type) + (mapcar (lambda (x) + `(eieio--typep (quote ,val) (quote ,x))) + (cdr type))))) + ((memq (car type) '(member member*)) + (memql val (cdr type))) + ((eq (car type) 'satisfies) + (funcall `(lambda () (,(cadr type) val)))) + (t (error "Bad type spec: %s" type))))) + +(defun eieio-perform-slot-validation (spec value) + "Return non-nil if SPEC does not match VALUE." + (or (eq spec t) ; t always passes + (eq value eieio-unbound) ; unbound always passes + (eieio--typep value spec))) + +(defun eieio-validate-slot-value (class slot-idx value slot) + "Make sure that for CLASS referencing SLOT-IDX, VALUE is valid. +Checks the :type specifier. +SLOT is the slot that is being checked, and is only used when throwing +an error." + (if eieio-skip-typecheck + nil + ;; Trim off object IDX junk added in for the object index. + (setq slot-idx (- slot-idx 3)) + (let ((st (aref (aref (class-v class) class-public-type) slot-idx))) + (if (not (eieio-perform-slot-validation st value)) + (signal 'invalid-slot-type (list class slot st value)))))) + +(defun eieio-validate-class-slot-value (class slot-idx value slot) + "Make sure that for CLASS referencing SLOT-IDX, VALUE is valid. +Checks the :type specifier. +SLOT is the slot that is being checked, and is only used when throwing +an error." + (if eieio-skip-typecheck + nil + (let ((st (aref (aref (class-v class) class-class-allocation-type) + slot-idx))) + (if (not (eieio-perform-slot-validation st value)) + (signal 'invalid-slot-type (list class slot st value)))))) + +(defun eieio-barf-if-slot-unbound (value instance slotname fn) + "Throw a signal if VALUE is a representation of an UNBOUND slot. +INSTANCE is the object being referenced. SLOTNAME is the offending +slot. If the slot is ok, return VALUE. +Argument FN is the function calling this verifier." + (if (and (eq value eieio-unbound) (not eieio-skip-typecheck)) + (slot-unbound instance (object-class instance) slotname fn) + value)) + +;;; Get/Set slots in an object. +;; +(defmacro oref (obj slot) + "Retrieve the value stored in OBJ in the slot named by SLOT. +Slot is the name of the slot when created by `defclass' or the label +created by the :initarg tag." + `(eieio-oref ,obj (quote ,slot))) + +(defun eieio-oref (obj slot) + "Return the value in OBJ at SLOT in the object vector." + (if (not (or (eieio-object-p obj) (class-p obj))) + (signal 'wrong-type-argument (list '(or eieio-object-p class-p) obj))) + (if (not (symbolp slot)) + (signal 'wrong-type-argument (list 'symbolp slot))) + (if (class-p obj) (eieio-class-un-autoload obj)) + (let* ((class (if (class-p obj) obj (aref obj object-class))) + (c (eieio-slot-name-index class obj slot))) + (if (not c) + ;; It might be missing because it is a :class allocated slot. + ;; Lets check that info out. + (if (setq c (eieio-class-slot-name-index class slot)) + ;; Oref that slot. + (aref (aref (class-v class) class-class-allocation-values) c) + ;; The slot-missing method is a cool way of allowing an object author + ;; to intercept missing slot definitions. Since it is also the LAST + ;; thing called in this fn, its return value would be retrieved. + (slot-missing obj slot 'oref) + ;;(signal 'invalid-slot-name (list (object-name obj) slot)) + ) + (if (not (eieio-object-p obj)) + (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (eieio-barf-if-slot-unbound (aref obj c) obj slot 'oref)))) + +(defalias 'slot-value 'eieio-oref) +(defalias 'set-slot-value 'eieio-oset) + +(defmacro oref-default (obj slot) + "Get the default value of OBJ (maybe a class) for SLOT. +The default value is the value installed in a class with the :initform +tag. SLOT can be the slot name, or the tag specified by the :initarg +tag in the `defclass' call." + `(eieio-oref-default ,obj (quote ,slot))) + +(defun eieio-oref-default (obj slot) + "Do the work for the macro `oref-default' with similar parameters. +Fills in OBJ's SLOT with its default value." + (if (not (or (eieio-object-p obj) (class-p obj))) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (if (not (symbolp slot)) (signal 'wrong-type-argument (list 'symbolp slot))) + (let* ((cl (if (eieio-object-p obj) (aref obj object-class) obj)) + (c (eieio-slot-name-index cl obj slot))) + (if (not c) + ;; It might be missing because it is a :class allocated slot. + ;; Lets check that info out. + (if (setq c + (eieio-class-slot-name-index cl slot)) + ;; Oref that slot. + (aref (aref (class-v cl) class-class-allocation-values) + c) + (slot-missing obj slot 'oref-default) + ;;(signal 'invalid-slot-name (list (class-name cl) slot)) + ) + (eieio-barf-if-slot-unbound + (let ((val (nth (- c 3) (aref (class-v cl) class-public-d)))) + (eieio-default-eval-maybe val)) + obj cl 'oref-default)))) + +(defsubst eieio-eval-default-p (val) + "Whether the default value VAL should be evaluated for use." + (and (consp val) (symbolp (car val)) (fboundp (car val)))) + +(defun eieio-default-eval-maybe (val) + "Check VAL, and return what `oref-default' would provide." + (cond + ;; Is it a function call? If so, evaluate it. + ((eieio-eval-default-p val) + (eval val)) + ;;;; check for quoted things, and unquote them + ;;((and (consp val) (eq (car val) 'quote)) + ;; (car (cdr val))) + ;; return it verbatim + (t val))) + +;;; Object Set macros +;; +(defmacro oset (obj slot value) + "Set the value in OBJ for slot SLOT to VALUE. +SLOT is the slot name as specified in `defclass' or the tag created +with in the :initarg slot. VALUE can be any Lisp object." + `(eieio-oset ,obj (quote ,slot) ,value)) + +(defun eieio-oset (obj slot value) + "Do the work for the macro `oset'. +Fills in OBJ's SLOT with VALUE." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (if (not (symbolp slot)) (signal 'wrong-type-argument (list 'symbolp slot))) + (let ((c (eieio-slot-name-index (object-class-fast obj) obj slot))) + (if (not c) + ;; It might be missing because it is a :class allocated slot. + ;; Lets check that info out. + (if (setq c + (eieio-class-slot-name-index (aref obj object-class) slot)) + ;; Oset that slot. + (progn + (eieio-validate-class-slot-value (object-class-fast obj) c value slot) + (aset (aref (class-v (aref obj object-class)) + class-class-allocation-values) + c value)) + ;; See oref for comment on `slot-missing' + (slot-missing obj slot 'oset value) + ;;(signal 'invalid-slot-name (list (object-name obj) slot)) + ) + (eieio-validate-slot-value (object-class-fast obj) c value slot) + (aset obj c value)))) + +(defmacro oset-default (class slot value) + "Set the default slot in CLASS for SLOT to VALUE. +The default value is usually set with the :initform tag during class +creation. This allows users to change the default behavior of classes +after they are created." + `(eieio-oset-default ,class (quote ,slot) ,value)) + +(defun eieio-oset-default (class slot value) + "Do the work for the macro `oset-default'. +Fills in the default value in CLASS' in SLOT with VALUE." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + (if (not (symbolp slot)) (signal 'wrong-type-argument (list 'symbolp slot))) + (let* ((scoped-class class) + (c (eieio-slot-name-index class nil slot))) + (if (not c) + ;; It might be missing because it is a :class allocated slot. + ;; Lets check that info out. + (if (setq c (eieio-class-slot-name-index class slot)) + (progn + ;; Oref that slot. + (eieio-validate-class-slot-value class c value slot) + (aset (aref (class-v class) class-class-allocation-values) c + value)) + (signal 'invalid-slot-name (list (class-name class) slot))) + (eieio-validate-slot-value class c value slot) + ;; Set this into the storage for defaults. + (setcar (nthcdr (- c 3) (aref (class-v class) class-public-d)) + value) + ;; Take the value, and put it into our cache object. + (eieio-oset (aref (class-v class) class-default-object-cache) + slot value) + ))) + +;;; Handy CLOS macros +;; +(defmacro with-slots (spec-list object &rest body) + "Bind SPEC-LIST lexically to slot values in OBJECT, and execute BODY. +This establishes a lexical environment for referring to the slots in +the instance named by the given slot-names as though they were +variables. Within such a context the value of the slot can be +specified by using its slot name, as if it were a lexically bound +variable. Both setf and setq can be used to set the value of the +slot. + +SPEC-LIST is of a form similar to `let'. For example: + + ((VAR1 SLOT1) + SLOT2 + SLOTN + (VARN+1 SLOTN+1)) + +Where each VAR is the local variable given to the associated +SLOT. A slot specified without a variable name is given a +variable name of the same name as the slot." + (declare (indent 2)) + ;; Transform the spec-list into a symbol-macrolet spec-list. + (let ((mappings (mapcar (lambda (entry) + (let ((var (if (listp entry) (car entry) entry)) + (slot (if (listp entry) (cadr entry) entry))) + (list var `(slot-value ,object ',slot)))) + spec-list))) + (append (list 'symbol-macrolet mappings) + body))) + +;;; Simple generators, and query functions. None of these would do +;; well embedded into an object. +;; +(defmacro object-class-fast (obj) "Return the class struct defining OBJ with no check." + `(aref ,obj object-class)) + +(defun class-name (class) "Return a Lisp like symbol name for CLASS." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + ;; I think this is supposed to return a symbol, but to me CLASS is a symbol, + ;; and I wanted a string. Arg! + (format "#" (symbol-name class))) + +(defun object-name (obj &optional extra) + "Return a Lisp like symbol string for object OBJ. +If EXTRA, include that in the string returned to represent the symbol." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (format "#<%s %s%s>" (symbol-name (object-class-fast obj)) + (aref obj object-name) (or extra ""))) + +(defun object-name-string (obj) "Return a string which is OBJ's name." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (aref obj object-name)) + +(defun object-set-name-string (obj name) "Set the string which is OBJ's NAME." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (if (not (stringp name)) (signal 'wrong-type-argument (list 'stringp name))) + (aset obj object-name name)) + +(defun object-class (obj) "Return the class struct defining OBJ." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (object-class-fast obj)) +(defalias 'class-of 'object-class) + +(defun object-class-name (obj) "Return a Lisp like symbol name for OBJ's class." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (class-name (object-class-fast obj))) + +(defmacro class-parents-fast (class) "Return parent classes to CLASS with no check." + `(aref (class-v ,class) class-parent)) + +(defun class-parents (class) + "Return parent classes to CLASS. (overload of variable). + +The CLOS function `class-direct-superclasses' is aliased to this function." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + (class-parents-fast class)) + +(defmacro class-children-fast (class) "Return child classes to CLASS with no check." + `(aref (class-v ,class) class-children)) + +(defun class-children (class) +"Return child classes to CLASS. + +The CLOS function `class-direct-subclasses' is aliased to this function." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + (class-children-fast class)) + +(defun eieio-c3-candidate (class remaining-inputs) + "Returns CLASS if it can go in the result now, otherwise nil" + ;; Ensure CLASS is not in any position but the first in any of the + ;; element lists of REMAINING-INPUTS. + (and (not (let ((found nil)) + (while (and remaining-inputs (not found)) + (setq found (member class (cdr (car remaining-inputs))) + remaining-inputs (cdr remaining-inputs))) + found)) + class)) + +(defun eieio-c3-merge-lists (reversed-partial-result remaining-inputs) + "Merge REVERSED-PARTIAL-RESULT REMAINING-INPUTS in a consistent order, if possible. +If a consistent order does not exist, signal an error." + (if (let ((tail remaining-inputs) + (found nil)) + (while (and tail (not found)) + (setq found (car tail) tail (cdr tail))) + (not found)) + ;; If all remaining inputs are empty lists, we are done. + (nreverse reversed-partial-result) + ;; Otherwise, we try to find the next element of the result. This + ;; is achieved by considering the first element of each + ;; (non-empty) input list and accepting a candidate if it is + ;; consistent with the rests of the input lists. + (let* ((found nil) + (tail remaining-inputs) + (next (progn + (while (and tail (not found)) + (setq found (and (car tail) + (eieio-c3-candidate (caar tail) + remaining-inputs)) + tail (cdr tail))) + found))) + (if next + ;; The graph is consistent so far, add NEXT to result and + ;; merge input lists, dropping NEXT from their heads where + ;; applicable. + (eieio-c3-merge-lists + (cons next reversed-partial-result) + (mapcar (lambda (l) (if (eq (first l) next) (rest l) l)) + remaining-inputs)) + ;; The graph is inconsistent, give up + (signal 'inconsistent-class-hierarchy (list remaining-inputs)))))) + +(defun eieio-class-precedence-dfs (class) + "Return all parents of CLASS in depth-first order." + (let* ((parents (class-parents-fast class)) + (classes (copy-sequence + (apply #'append + (list class) + (or + (mapcar + (lambda (parent) + (cons parent + (eieio-class-precedence-dfs parent))) + parents) + '((eieio-default-superclass)))))) + (tail classes)) + ;; Remove duplicates. + (while tail + (setcdr tail (delq (car tail) (cdr tail))) + (setq tail (cdr tail))) + classes)) + +(defun eieio-class-precedence-bfs (class) + "Return all parents of CLASS in breadth-first order." + (let ((result) + (queue (or (class-parents-fast class) + '(eieio-default-superclass)))) + (while queue + (let ((head (pop queue))) + (unless (member head result) + (push head result) + (unless (eq head 'eieio-default-superclass) + (setq queue (append queue (or (class-parents-fast head) + '(eieio-default-superclass)))))))) + (cons class (nreverse result))) + ) + +(defun eieio-class-precedence-c3 (class) + "Return all parents of CLASS in c3 order." + (let ((parents (class-parents-fast class))) + (eieio-c3-merge-lists + (list class) + (append + (or + (mapcar + (lambda (x) + (eieio-class-precedence-c3 x)) + parents) + '((eieio-default-superclass))) + (list parents)))) + ) + +(defun class-precedence-list (class) + "Return (transitively closed) list of parents of CLASS. +The order, in which the parents are returned depends on the +method invocation orders of the involved classes." + (if (or (null class) (eq class 'eieio-default-superclass)) + nil + (case (class-method-invocation-order class) + (:depth-first + (eieio-class-precedence-dfs class)) + (:breadth-first + (eieio-class-precedence-bfs class)) + (:c3 + (eieio-class-precedence-c3 class)))) + ) + +;; Official CLOS functions. +(defalias 'class-direct-superclasses 'class-parents) +(defalias 'class-direct-subclasses 'class-children) + +(defmacro class-parent-fast (class) "Return first parent class to CLASS with no check." + `(car (class-parents-fast ,class))) + +(defmacro class-parent (class) "Return first parent class to CLASS. (overload of variable)." + `(car (class-parents ,class))) + +(defmacro same-class-fast-p (obj class) "Return t if OBJ is of class-type CLASS with no error checking." + `(eq (aref ,obj object-class) ,class)) + +(defun same-class-p (obj class) "Return t if OBJ is of class-type CLASS." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (same-class-fast-p obj class)) + +(defun object-of-class-p (obj class) + "Return non-nil if OBJ is an instance of CLASS or CLASS' subclasses." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + ;; class will be checked one layer down + (child-of-class-p (aref obj object-class) class)) +;; Backwards compatibility +(defalias 'obj-of-class-p 'object-of-class-p) + +(defun child-of-class-p (child class) + "Return non-nil if CHILD class is a subclass of CLASS." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + (if (not (class-p child)) (signal 'wrong-type-argument (list 'class-p child))) + (let ((p nil)) + (while (and child (not (eq child class))) + (setq p (append p (aref (class-v child) class-parent)) + child (car p) + p (cdr p))) + (if child t))) + +(defun object-slots (obj) + "Return list of slots available in OBJ." + (if (not (eieio-object-p obj)) (signal 'wrong-type-argument (list 'eieio-object-p obj))) + (aref (class-v (object-class-fast obj)) class-public-a)) + +(defun class-slot-initarg (class slot) "Fetch from CLASS, SLOT's :initarg." + (if (not (class-p class)) (signal 'wrong-type-argument (list 'class-p class))) + (let ((ia (aref (class-v class) class-initarg-tuples)) + (f nil)) + (while (and ia (not f)) + (if (eq (cdr (car ia)) slot) + (setq f (car (car ia)))) + (setq ia (cdr ia))) + f)) + +;;; CLOS queries into classes and slots +;; +(defun slot-boundp (object slot) + "Return non-nil if OBJECT's SLOT is bound. +Setting a slot's value makes it bound. Calling `slot-makeunbound' will +make a slot unbound. +OBJECT can be an instance or a class." + ;; Skip typechecking while retrieving this value. + (let ((eieio-skip-typecheck t)) + ;; Return nil if the magic symbol is in there. + (not (eq (cond + ((eieio-object-p object) (eieio-oref object slot)) + ((class-p object) (eieio-oref-default object slot)) + (t (signal 'wrong-type-argument (list 'eieio-object-p object)))) + eieio-unbound)))) + +(defun slot-makeunbound (object slot) + "In OBJECT, make SLOT unbound." + (eieio-oset object slot eieio-unbound)) + +(defun slot-exists-p (object-or-class slot) + "Return non-nil if OBJECT-OR-CLASS has SLOT." + (let ((cv (class-v (cond ((eieio-object-p object-or-class) + (object-class object-or-class)) + ((class-p object-or-class) + object-or-class)) + ))) + (or (memq slot (aref cv class-public-a)) + (memq slot (aref cv class-class-allocation-a))) + )) + +(defun find-class (symbol &optional errorp) + "Return the class that SYMBOL represents. +If there is no class, nil is returned if ERRORP is nil. +If ERRORP is non-nil, `wrong-argument-type' is signaled." + (if (not (class-p symbol)) + (if errorp (signal 'wrong-type-argument (list 'class-p symbol)) + nil) + (class-v symbol))) + +;;; Slightly more complex utility functions for objects +;; +(defun object-assoc (key slot list) + "Return an object if KEY is `equal' to SLOT's value of an object in LIST. +LIST is a list of objects whose slots are searched. +Objects in LIST do not need to have a slot named SLOT, nor does +SLOT need to be bound. If these errors occur, those objects will +be ignored." + (if (not (listp list)) (signal 'wrong-type-argument (list 'listp list))) + (while (and list (not (condition-case nil + ;; This prevents errors for missing slots. + (equal key (eieio-oref (car list) slot)) + (error nil)))) + (setq list (cdr list))) + (car list)) + +(defun object-assoc-list (slot list) + "Return an association list with the contents of SLOT as the key element. +LIST must be a list of objects with SLOT in it. +This is useful when you need to do completing read on an object group." + (if (not (listp list)) (signal 'wrong-type-argument (list 'listp list))) + (let ((assoclist nil)) + (while list + (setq assoclist (cons (cons (eieio-oref (car list) slot) + (car list)) + assoclist)) + (setq list (cdr list))) + (nreverse assoclist))) + +(defun object-assoc-list-safe (slot list) + "Return an association list with the contents of SLOT as the key element. +LIST must be a list of objects, but those objects do not need to have +SLOT in it. If it does not, then that element is left out of the association +list." + (if (not (listp list)) (signal 'wrong-type-argument (list 'listp list))) + (let ((assoclist nil)) + (while list + (if (slot-exists-p (car list) slot) + (setq assoclist (cons (cons (eieio-oref (car list) slot) + (car list)) + assoclist))) + (setq list (cdr list))) + (nreverse assoclist))) + +(defun object-add-to-list (object slot item &optional append) + "In OBJECT's SLOT, add ITEM to the list of elements. +Optional argument APPEND indicates we need to append to the list. +If ITEM already exists in the list in SLOT, then it is not added. +Comparison is done with `equal' through the `member' function call. +If SLOT is unbound, bind it to the list containing ITEM." + (let (ov) + ;; Find the originating list. + (if (not (slot-boundp object slot)) + (setq ov (list item)) + (setq ov (eieio-oref object slot)) + ;; turn it into a list. + (unless (listp ov) + (setq ov (list ov))) + ;; Do the combination + (if (not (member item ov)) + (setq ov + (if append + (append ov (list item)) + (cons item ov))))) + ;; Set back into the slot. + (eieio-oset object slot ov))) + +(defun object-remove-from-list (object slot item) + "In OBJECT's SLOT, remove occurrences of ITEM. +Deletion is done with `delete', which deletes by side effect, +and comparisons are done with `equal'. +If SLOT is unbound, do nothing." + (if (not (slot-boundp object slot)) + nil + (eieio-oset object slot (delete item (eieio-oref object slot))))) + +;;; EIEIO internal search functions +;; +(defun eieio-slot-originating-class-p (start-class slot) + "Return non-nil if START-CLASS is the first class to define SLOT. +This is for testing if `scoped-class' is the class that defines SLOT +so that we can protect private slots." + (let ((par (class-parents start-class)) + (ret t)) + (if (not par) + t + (while (and par ret) + (if (intern-soft (symbol-name slot) + (aref (class-v (car par)) + class-symbol-obarray)) + (setq ret nil)) + (setq par (cdr par))) + ret))) + +(defun eieio-slot-name-index (class obj slot) + "In CLASS for OBJ find the index of the named SLOT. +The slot is a symbol which is installed in CLASS by the `defclass' +call. OBJ can be nil, but if it is an object, and the slot in question +is protected, access will be allowed if OBJ is a child of the currently +`scoped-class'. +If SLOT is the value created with :initarg instead, +reverse-lookup that name, and recurse with the associated slot value." + ;; Removed checks to outside this call + (let* ((fsym (intern-soft (symbol-name slot) + (aref (class-v class) + class-symbol-obarray))) + (fsi (if (symbolp fsym) (symbol-value fsym) nil))) + (if (integerp fsi) + (cond + ((not (get fsym 'protection)) + (+ 3 fsi)) + ((and (eq (get fsym 'protection) 'protected) + scoped-class + (or (child-of-class-p class scoped-class) + (and (eieio-object-p obj) + (child-of-class-p class (object-class obj))))) + (+ 3 fsi)) + ((and (eq (get fsym 'protection) 'private) + (or (and scoped-class + (eieio-slot-originating-class-p scoped-class slot)) + eieio-initializing-object)) + (+ 3 fsi)) + (t nil)) + (let ((fn (eieio-initarg-to-attribute class slot))) + (if fn (eieio-slot-name-index class obj fn) nil))))) + +(defun eieio-class-slot-name-index (class slot) + "In CLASS find the index of the named SLOT. +The slot is a symbol which is installed in CLASS by the `defclass' +call. If SLOT is the value created with :initarg instead, +reverse-lookup that name, and recurse with the associated slot value." + ;; This will happen less often, and with fewer slots. Do this the + ;; storage cheap way. + (let* ((a (aref (class-v class) class-class-allocation-a)) + (l1 (length a)) + (af (memq slot a)) + (l2 (length af))) + ;; Slot # is length of the total list, minus the remaining list of + ;; the found slot. + (if af (- l1 l2)))) + +;;; CLOS generics internal function handling +;; +(defvar eieio-generic-call-methodname nil + "When using `call-next-method', provides a context on how to do it.") +(defvar eieio-generic-call-arglst nil + "When using `call-next-method', provides a context for parameters.") +(defvar eieio-generic-call-key nil + "When using `call-next-method', provides a context for the current key. +Keys are a number representing :before, :primary, and :after methods.") +(defvar eieio-generic-call-next-method-list nil + "When executing a PRIMARY or STATIC method, track the 'next-method'. +During executions, the list is first generated, then as each next method +is called, the next method is popped off the stack.") + +(defvar eieio-pre-method-execution-hooks nil + "*Hooks run just before a method is executed. +The hook function must accept one argument, the list of forms +about to be executed.") + +(defun eieio-generic-call (method args) + "Call METHOD with ARGS. +ARGS provides the context on which implementation to use. +This should only be called from a generic function." + ;; We must expand our arguments first as they are always + ;; passed in as quoted symbols + (let ((newargs nil) (mclass nil) (lambdas nil) (tlambdas nil) (keys nil) + (eieio-generic-call-methodname method) + (eieio-generic-call-arglst args) + (firstarg nil) + (primarymethodlist nil)) + ;; get a copy + (setq newargs args + firstarg (car newargs)) + ;; Is the class passed in autoloaded? + ;; Since class names are also constructors, they can be autoloaded + ;; via the autoload command. Check for this, and load them in. + ;; It's ok if it doesn't turn out to be a class. Probably want that + ;; function loaded anyway. + (if (and (symbolp firstarg) + (fboundp firstarg) + (listp (symbol-function firstarg)) + (eq 'autoload (car (symbol-function firstarg)))) + (load (nth 1 (symbol-function firstarg)))) + ;; Determine the class to use. + (cond ((eieio-object-p firstarg) + (setq mclass (object-class-fast firstarg))) + ((class-p firstarg) + (setq mclass firstarg)) + ) + ;; Make sure the class is a valid class + ;; mclass can be nil (meaning a generic for should be used. + ;; mclass cannot have a value that is not a class, however. + (when (and (not (null mclass)) (not (class-p mclass))) + (error "Cannot dispatch method %S on class %S" + method mclass) + ) + ;; Now create a list in reverse order of all the calls we have + ;; make in order to successfully do this right. Rules: + ;; 1) Only call generics if scoped-class is not defined + ;; This prevents multiple calls in the case of recursion + ;; 2) Only call static if this is a static method. + ;; 3) Only call specifics if the definition allows for them. + ;; 4) Call in order based on :before, :primary, and :after + (when (eieio-object-p firstarg) + ;; Non-static calls do all this stuff. + + ;; :after methods + (setq tlambdas + (if mclass + (eieiomt-method-list method method-after mclass) + (list (eieio-generic-form method method-after nil))) + ;;(or (and mclass (eieio-generic-form method method-after mclass)) + ;; (eieio-generic-form method method-after nil)) + ) + (setq lambdas (append tlambdas lambdas) + keys (append (make-list (length tlambdas) method-after) keys)) + + ;; :primary methods + (setq tlambdas + (or (and mclass (eieio-generic-form method method-primary mclass)) + (eieio-generic-form method method-primary nil))) + (when tlambdas + (setq lambdas (cons tlambdas lambdas) + keys (cons method-primary keys) + primarymethodlist + (eieiomt-method-list method method-primary mclass))) + + ;; :before methods + (setq tlambdas + (if mclass + (eieiomt-method-list method method-before mclass) + (list (eieio-generic-form method method-before nil))) + ;;(or (and mclass (eieio-generic-form method method-before mclass)) + ;; (eieio-generic-form method method-before nil)) + ) + (setq lambdas (append tlambdas lambdas) + keys (append (make-list (length tlambdas) method-before) keys)) + ) + + (if mclass + ;; For the case of a class, + ;; if there were no methods found, then there could be :static methods. + (when (not lambdas) + (setq tlambdas + (eieio-generic-form method method-static mclass)) + (setq lambdas (cons tlambdas lambdas) + keys (cons method-static keys) + primarymethodlist ;; Re-use even with bad name here + (eieiomt-method-list method method-static mclass))) + ;; For the case of no class (ie - mclass == nil) then there may + ;; be a primary method. + (setq tlambdas + (eieio-generic-form method method-primary nil)) + (when tlambdas + (setq lambdas (cons tlambdas lambdas) + keys (cons method-primary keys) + primarymethodlist + (eieiomt-method-list method method-primary nil))) + ) + + (run-hook-with-args 'eieio-pre-method-execution-hooks + primarymethodlist) + + ;; Now loop through all occurrences forms which we must execute + ;; (which are happily sorted now) and execute them all! + (let ((rval nil) (lastval nil) (rvalever nil) (found nil)) + (while lambdas + (if (car lambdas) + (let* ((scoped-class (cdr (car lambdas))) + (eieio-generic-call-key (car keys)) + (has-return-val + (or (= eieio-generic-call-key method-primary) + (= eieio-generic-call-key method-static))) + (eieio-generic-call-next-method-list + ;; Use the cdr, as the first element is the fcn + ;; we are calling right now. + (when has-return-val (cdr primarymethodlist))) + ) + (setq found t) + ;;(setq rval (apply (car (car lambdas)) newargs)) + (setq lastval (apply (car (car lambdas)) newargs)) + (when has-return-val + (setq rval lastval + rvalever t)) + )) + (setq lambdas (cdr lambdas) + keys (cdr keys))) + (if (not found) + (if (eieio-object-p (car args)) + (setq rval (apply 'no-applicable-method (car args) method args) + rvalever t) + (signal + 'no-method-definition + (list method args)))) + ;; Right Here... it could be that lastval is returned when + ;; rvalever is nil. Is that right? + rval))) + +(defun eieio-generic-call-primary-only (method args) + "Call METHOD with ARGS for methods with only :PRIMARY implementations. +ARGS provides the context on which implementation to use. +This should only be called from a generic function. + +This method is like `eieio-generic-call', but only +implementations in the :PRIMARY slot are queried. After many +years of use, it appears that over 90% of methods in use +have :PRIMARY implementations only. We can therefore optimize +for this common case to improve performance." + ;; We must expand our arguments first as they are always + ;; passed in as quoted symbols + (let ((newargs nil) (mclass nil) (lambdas nil) + (eieio-generic-call-methodname method) + (eieio-generic-call-arglst args) + (firstarg nil) + (primarymethodlist nil) + ) + ;; get a copy + (setq newargs args + firstarg (car newargs)) + + ;; Determine the class to use. + (cond ((eieio-object-p firstarg) + (setq mclass (object-class-fast firstarg))) + ((not firstarg) + (error "Method %s called on nil" method)) + ((not (eieio-object-p firstarg)) + (error "Primary-only method %s called on something not an object" method)) + (t + (error "EIEIO Error: Improperly classified method %s as primary only" + method) + )) + ;; Make sure the class is a valid class + ;; mclass can be nil (meaning a generic for should be used. + ;; mclass cannot have a value that is not a class, however. + (when (null mclass) + (error "Cannot dispatch method %S on class %S" method mclass) + ) + + ;; :primary methods + (setq lambdas (eieio-generic-form method method-primary mclass)) + (setq primarymethodlist ;; Re-use even with bad name here + (eieiomt-method-list method method-primary mclass)) + + ;; Now loop through all occurrences forms which we must execute + ;; (which are happily sorted now) and execute them all! + (let* ((rval nil) (lastval nil) (rvalever nil) + (scoped-class (cdr lambdas)) + (eieio-generic-call-key method-primary) + ;; Use the cdr, as the first element is the fcn + ;; we are calling right now. + (eieio-generic-call-next-method-list (cdr primarymethodlist)) + ) + + (if (or (not lambdas) (not (car lambdas))) + + ;; No methods found for this impl... + (if (eieio-object-p (car args)) + (setq rval (apply 'no-applicable-method (car args) method args) + rvalever t) + (signal + 'no-method-definition + (list method args))) + + ;; Do the regular implementation here. + + (run-hook-with-args 'eieio-pre-method-execution-hooks + lambdas) + + (setq lastval (apply (car lambdas) newargs)) + (setq rval lastval + rvalever t) + ) + + ;; Right Here... it could be that lastval is returned when + ;; rvalever is nil. Is that right? + rval))) + +(defun eieiomt-method-list (method key class) + "Return an alist list of methods lambdas. +METHOD is the method name. +KEY represents either :before, or :after methods. +CLASS is the starting class to search from in the method tree. +If CLASS is nil, then an empty list of methods should be returned." + ;; Note: eieiomt - the MT means MethodTree. See more comments below + ;; for the rest of the eieiomt methods. + + ;; Collect lambda expressions stored for the class and its parent + ;; classes. + (let (lambdas) + (dolist (ancestor (class-precedence-list class)) + ;; Lookup the form to use for the PRIMARY object for the next level + (let ((tmpl (eieio-generic-form method key ancestor))) + (when (and tmpl + (or (not lambdas) + ;; This prevents duplicates coming out of the + ;; class method optimizer. Perhaps we should + ;; just not optimize before/afters? + (not (member tmpl lambdas)))) + (push tmpl lambdas)))) + + ;; Return collected lambda. For :after methods, return in current + ;; order (most general class last); Otherwise, reverse order. + (if (eq key method-after) + lambdas + (nreverse lambdas)))) + +(defun next-method-p () + "Return non-nil if there is a next method. +Returns a list of lambda expressions which is the `next-method' +order." + eieio-generic-call-next-method-list) + +(defun call-next-method (&rest replacement-args) + "Call the superclass method from a subclass method. +The superclass method is specified in the current method list, +and is called the next method. + +If REPLACEMENT-ARGS is non-nil, then use them instead of +`eieio-generic-call-arglst'. The generic arg list are the +arguments passed in at the top level. + +Use `next-method-p' to find out if there is a next method to call." + (if (not scoped-class) + (error "`call-next-method' not called within a class specific method")) + (if (and (/= eieio-generic-call-key method-primary) + (/= eieio-generic-call-key method-static)) + (error "Cannot `call-next-method' except in :primary or :static methods") + ) + (let ((newargs (or replacement-args eieio-generic-call-arglst)) + (next (car eieio-generic-call-next-method-list)) + ) + (if (or (not next) (not (car next))) + (apply 'no-next-method (car newargs) (cdr newargs)) + (let* ((eieio-generic-call-next-method-list + (cdr eieio-generic-call-next-method-list)) + (eieio-generic-call-arglst newargs) + (scoped-class (cdr next)) + (fcn (car next)) + ) + (apply fcn newargs) + )))) + +;;; +;; eieio-method-tree : eieiomt- +;; +;; Stored as eieio-method-tree in property list of a generic method +;; +;; (eieio-method-tree . [BEFORE PRIMARY AFTER +;; genericBEFORE genericPRIMARY genericAFTER]) +;; and +;; (eieio-method-obarray . [BEFORE PRIMARY AFTER +;; genericBEFORE genericPRIMARY genericAFTER]) +;; where the association is a vector. +;; (aref 0 -- all static methods. +;; (aref 1 -- all methods classified as :before +;; (aref 2 -- all methods classified as :primary +;; (aref 3 -- all methods classified as :after +;; (aref 4 -- a generic classified as :before +;; (aref 5 -- a generic classified as :primary +;; (aref 6 -- a generic classified as :after +;; +(defvar eieiomt-optimizing-obarray nil + "While mapping atoms, this contain the obarray being optimized.") + +(defun eieiomt-install (method-name) + "Install the method tree, and obarray onto METHOD-NAME. +Do not do the work if they already exist." + (let ((emtv (get method-name 'eieio-method-tree)) + (emto (get method-name 'eieio-method-obarray))) + (if (or (not emtv) (not emto)) + (progn + (setq emtv (put method-name 'eieio-method-tree + (make-vector method-num-slots nil)) + emto (put method-name 'eieio-method-obarray + (make-vector method-num-slots nil))) + (aset emto 0 (make-vector 11 0)) + (aset emto 1 (make-vector 11 0)) + (aset emto 2 (make-vector 41 0)) + (aset emto 3 (make-vector 11 0)) + )))) + +(defun eieiomt-add (method-name method key class) + "Add to METHOD-NAME the forms METHOD in a call position KEY for CLASS. +METHOD-NAME is the name created by a call to `defgeneric'. +METHOD are the forms for a given implementation. +KEY is an integer (see comment in eieio.el near this function) which +is associated with the :static :before :primary and :after tags. +It also indicates if CLASS is defined or not. +CLASS is the class this method is associated with." + (if (or (> key method-num-slots) (< key 0)) + (error "eieiomt-add: method key error!")) + (let ((emtv (get method-name 'eieio-method-tree)) + (emto (get method-name 'eieio-method-obarray))) + ;; Make sure the method tables are available. + (if (or (not emtv) (not emto)) + (error "Programmer error: eieiomt-add")) + ;; only add new cells on if it doesn't already exist! + (if (assq class (aref emtv key)) + (setcdr (assq class (aref emtv key)) method) + (aset emtv key (cons (cons class method) (aref emtv key)))) + ;; Add function definition into newly created symbol, and store + ;; said symbol in the correct obarray, otherwise use the + ;; other array to keep this stuff + (if (< key method-num-lists) + (let ((nsym (intern (symbol-name class) (aref emto key)))) + (fset nsym method))) + ;; Now optimize the entire obarray + (if (< key method-num-lists) + (let ((eieiomt-optimizing-obarray (aref emto key))) + ;; @todo - Is this overkill? Should we just clear the symbol? + (mapatoms 'eieiomt-sym-optimize eieiomt-optimizing-obarray))) + )) + +(defun eieiomt-next (class) + "Return the next parent class for CLASS. +If CLASS is a superclass, return variable `eieio-default-superclass'. +If CLASS is variable `eieio-default-superclass' then return nil. +This is different from function `class-parent' as class parent returns +nil for superclasses. This function performs no type checking!" + ;; No type-checking because all calls are made from functions which + ;; are safe and do checking for us. + (or (class-parents-fast class) + (if (eq class 'eieio-default-superclass) + nil + '(eieio-default-superclass)))) + +(defun eieiomt-sym-optimize (s) + "Find the next class above S which has a function body for the optimizer." + ;; Set the value to nil in case there is no nearest cell. + (set s nil) + ;; Find the nearest cell that has a function body. If we find one, + ;; we replace the nil from above. + (let ((external-symbol (intern-soft (symbol-name s)))) + (catch 'done + (dolist (ancestor (rest (class-precedence-list external-symbol))) + (let ((ov (intern-soft (symbol-name ancestor) + eieiomt-optimizing-obarray))) + (when (fboundp ov) + (set s ov) ;; store ov as our next symbol + (throw 'done ancestor))))))) + +(defun eieio-generic-form (method key class) + "Return the lambda form belonging to METHOD using KEY based upon CLASS. +If CLASS is not a class then use `generic' instead. If class has +no form, but has a parent class, then trace to that parent class. +The first time a form is requested from a symbol, an optimized path +is memorized for faster future use." + (let ((emto (aref (get method 'eieio-method-obarray) + (if class key (eieio-specialized-key-to-generic-key key))))) + (if (class-p class) + ;; 1) find our symbol + (let ((cs (intern-soft (symbol-name class) emto))) + (if (not cs) + ;; 2) If there isn't one, then make one. + ;; This can be slow since it only occurs once + (progn + (setq cs (intern (symbol-name class) emto)) + ;; 2.1) Cache its nearest neighbor with a quick optimize + ;; which should only occur once for this call ever + (let ((eieiomt-optimizing-obarray emto)) + (eieiomt-sym-optimize cs)))) + ;; 3) If it's bound return this one. + (if (fboundp cs) + (cons cs (aref (class-v class) class-symbol)) + ;; 4) If it's not bound then this variable knows something + (if (symbol-value cs) + (progn + ;; 4.1) This symbol holds the next class in its value + (setq class (symbol-value cs) + cs (intern-soft (symbol-name class) emto)) + ;; 4.2) The optimizer should always have chosen a + ;; function-symbol + ;;(if (fboundp cs) + (cons cs (aref (class-v (intern (symbol-name class))) + class-symbol)) + ;;(error "EIEIO optimizer: erratic data loss!")) + ) + ;; There never will be a funcall... + nil))) + ;; for a generic call, what is a list, is the function body we want. + (let ((emtl (aref (get method 'eieio-method-tree) + (if class key (eieio-specialized-key-to-generic-key key))))) + (if emtl + ;; The car of EMTL is supposed to be a class, which in this + ;; case is nil, so skip it. + (cons (cdr (car emtl)) nil) + nil))))) + +;;; +;; Way to assign slots based on a list. Used for constructors, or +;; even resetting an object at run-time +;; +(defun eieio-set-defaults (obj &optional set-all) + "Take object OBJ, and reset all slots to their defaults. +If SET-ALL is non-nil, then when a default is nil, that value is +reset. If SET-ALL is nil, the slots are only reset if the default is +not nil." + (let ((scoped-class (aref obj object-class)) + (eieio-initializing-object t) + (pub (aref (class-v (aref obj object-class)) class-public-a))) + (while pub + (let ((df (eieio-oref-default obj (car pub)))) + (if (or df set-all) + (eieio-oset obj (car pub) df))) + (setq pub (cdr pub))))) + +(defun eieio-initarg-to-attribute (class initarg) + "For CLASS, convert INITARG to the actual attribute name. +If there is no translation, pass it in directly (so we can cheat if +need be... May remove that later...)" + (let ((tuple (assoc initarg (aref (class-v class) class-initarg-tuples)))) + (if tuple + (cdr tuple) + nil))) + +(defun eieio-attribute-to-initarg (class attribute) + "In CLASS, convert the ATTRIBUTE into the corresponding init argument tag. +This is usually a symbol that starts with `:'." + (let ((tuple (rassoc attribute (aref (class-v class) class-initarg-tuples)))) + (if tuple + (car tuple) + nil))) + + +;;; Here are some special types of errors +;; +(intern "no-method-definition") +(put 'no-method-definition 'error-conditions '(no-method-definition error)) +(put 'no-method-definition 'error-message "No method definition") + +(intern "no-next-method") +(put 'no-next-method 'error-conditions '(no-next-method error)) +(put 'no-next-method 'error-message "No next method") + +(intern "invalid-slot-name") +(put 'invalid-slot-name 'error-conditions '(invalid-slot-name error)) +(put 'invalid-slot-name 'error-message "Invalid slot name") + +(intern "invalid-slot-type") +(put 'invalid-slot-type 'error-conditions '(invalid-slot-type error nil)) +(put 'invalid-slot-type 'error-message "Invalid slot type") + +(intern "unbound-slot") +(put 'unbound-slot 'error-conditions '(unbound-slot error nil)) +(put 'unbound-slot 'error-message "Unbound slot") + +(intern "inconsistent-class-hierarchy") +(put 'inconsistent-class-hierarchy 'error-conditions + '(inconsistent-class-hierarchy error nil)) +(put 'inconsistent-class-hierarchy 'error-message "Inconsistent class hierarchy") + +;;; Here are some CLOS items that need the CL package +;; + +(defsetf slot-value (obj slot) (store) (list 'eieio-oset obj slot store)) +(defsetf eieio-oref (obj slot) (store) (list 'eieio-oset obj slot store)) + +;; The below setf method was written by Arnd Kohrs +(define-setf-method oref (obj slot) + (with-no-warnings + (require 'cl) + (let ((obj-temp (gensym)) + (slot-temp (gensym)) + (store-temp (gensym))) + (list (list obj-temp slot-temp) + (list obj `(quote ,slot)) + (list store-temp) + (list 'set-slot-value obj-temp slot-temp + store-temp) + (list 'slot-value obj-temp slot-temp))))) + + +;;; +;; We want all objects created by EIEIO to have some default set of +;; behaviours so we can create object utilities, and allow various +;; types of error checking. To do this, create the default EIEIO +;; class, and when no parent class is specified, use this as the +;; default. (But don't store it in the other classes as the default, +;; allowing for transparent support.) +;; + +(defclass eieio-default-superclass nil + nil + "Default parent class for classes with no specified parent class. +Its slots are automatically adopted by classes with no specified parents. +This class is not stored in the `parent' slot of a class vector." + :abstract t) + +(defalias 'standard-class 'eieio-default-superclass) + +(defgeneric constructor (class newname &rest slots) + "Default constructor for CLASS `eieio-default-superclass'.") + +(defmethod constructor :static + ((class eieio-default-superclass) newname &rest slots) + "Default constructor for CLASS `eieio-default-superclass'. +NEWNAME is the name to be given to the constructed object. +SLOTS are the initialization slots used by `shared-initialize'. +This static method is called when an object is constructed. +It allocates the vector used to represent an EIEIO object, and then +calls `shared-initialize' on that object." + (let* ((new-object (copy-sequence (aref (class-v class) + class-default-object-cache)))) + ;; Update the name for the newly created object. + (aset new-object object-name newname) + ;; Call the initialize method on the new object with the slots + ;; that were passed down to us. + (initialize-instance new-object slots) + ;; Return the created object. + new-object)) + +(defgeneric shared-initialize (obj slots) + "Set slots of OBJ with SLOTS which is a list of name/value pairs. +Called from the constructor routine.") + +(defmethod shared-initialize ((obj eieio-default-superclass) slots) + "Set slots of OBJ with SLOTS which is a list of name/value pairs. +Called from the constructor routine." + (let ((scoped-class (aref obj object-class))) + (while slots + (let ((rn (eieio-initarg-to-attribute (object-class-fast obj) + (car slots)))) + (if (not rn) + (slot-missing obj (car slots) 'oset (car (cdr slots))) + (eieio-oset obj rn (car (cdr slots))))) + (setq slots (cdr (cdr slots)))))) + +(defgeneric initialize-instance (this &optional slots) + "Construct the new object THIS based on SLOTS.") + +(defmethod initialize-instance ((this eieio-default-superclass) + &optional slots) + "Construct the new object THIS based on SLOTS. +SLOTS is a tagged list where odd numbered elements are tags, and +even numbered elements are the values to store in the tagged slot. +If you overload the `initialize-instance', there you will need to +call `shared-initialize' yourself, or you can call `call-next-method' +to have this constructor called automatically. If these steps are +not taken, then new objects of your class will not have their values +dynamically set from SLOTS." + ;; First, see if any of our defaults are `lambda', and + ;; re-evaluate them and apply the value to our slots. + (let* ((scoped-class (class-v (aref this object-class))) + (slot (aref scoped-class class-public-a)) + (defaults (aref scoped-class class-public-d))) + (while slot + ;; For each slot, see if we need to evaluate it. + ;; + ;; Paul Landes said in an email: + ;; > CL evaluates it if it can, and otherwise, leaves it as + ;; > the quoted thing as you already have. This is by the + ;; > Sonya E. Keene book and other things I've look at on the + ;; > web. + (let ((dflt (eieio-default-eval-maybe (car defaults)))) + (when (not (eq dflt (car defaults))) + (eieio-oset this (car slot) dflt) )) + ;; Next. + (setq slot (cdr slot) + defaults (cdr defaults)))) + ;; Shared initialize will parse our slots for us. + (shared-initialize this slots)) + +(defgeneric slot-missing (object slot-name operation &optional new-value) + "Method invoked when an attempt to access a slot in OBJECT fails.") + +(defmethod slot-missing ((object eieio-default-superclass) slot-name + operation &optional new-value) + "Method invoked when an attempt to access a slot in OBJECT fails. +SLOT-NAME is the name of the failed slot, OPERATION is the type of access +that was requested, and optional NEW-VALUE is the value that was desired +to be set. + +This method is called from `oref', `oset', and other functions which +directly reference slots in EIEIO objects." + (signal 'invalid-slot-name (list (object-name object) + slot-name))) + +(defgeneric slot-unbound (object class slot-name fn) + "Slot unbound is invoked during an attempt to reference an unbound slot.") + +(defmethod slot-unbound ((object eieio-default-superclass) + class slot-name fn) + "Slot unbound is invoked during an attempt to reference an unbound slot. +OBJECT is the instance of the object being reference. CLASS is the +class of OBJECT, and SLOT-NAME is the offending slot. This function +throws the signal `unbound-slot'. You can overload this function and +return the value to use in place of the unbound value. +Argument FN is the function signaling this error. +Use `slot-boundp' to determine if a slot is bound or not. + +In CLOS, the argument list is (CLASS OBJECT SLOT-NAME), but +EIEIO can only dispatch on the first argument, so the first two are swapped." + (signal 'unbound-slot (list (class-name class) (object-name object) + slot-name fn))) + +(defgeneric no-applicable-method (object method &rest args) + "Called if there are no implementations for OBJECT in METHOD.") + +(defmethod no-applicable-method ((object eieio-default-superclass) + method &rest args) + "Called if there are no implementations for OBJECT in METHOD. +OBJECT is the object which has no method implementation. +ARGS are the arguments that were passed to METHOD. + +Implement this for a class to block this signal. The return +value becomes the return value of the original method call." + (signal 'no-method-definition (list method (object-name object))) + ) + +(defgeneric no-next-method (object &rest args) +"Called from `call-next-method' when no additional methods are available.") + +(defmethod no-next-method ((object eieio-default-superclass) + &rest args) + "Called from `call-next-method' when no additional methods are available. +OBJECT is othe object being called on `call-next-method'. +ARGS are the arguments it is called by. +This method signals `no-next-method' by default. Override this +method to not throw an error, and its return value becomes the +return value of `call-next-method'." + (signal 'no-next-method (list (object-name object) args)) +) + +(defgeneric clone (obj &rest params) + "Make a copy of OBJ, and then supply PARAMS. +PARAMS is a parameter list of the same form used by `initialize-instance'. + +When overloading `clone', be sure to call `call-next-method' +first and modify the returned object.") + +(defmethod clone ((obj eieio-default-superclass) &rest params) + "Make a copy of OBJ, and then apply PARAMS." + (let ((nobj (copy-sequence obj)) + (nm (aref obj object-name)) + (passname (and params (stringp (car params)))) + (num 1)) + (if params (shared-initialize nobj (if passname (cdr params) params))) + (if (not passname) + (save-match-data + (if (string-match "-\\([0-9]+\\)" nm) + (setq num (1+ (string-to-number (match-string 1 nm))) + nm (substring nm 0 (match-beginning 0)))) + (aset nobj object-name (concat nm "-" (int-to-string num)))) + (aset nobj object-name (car params))) + nobj)) + +(defgeneric destructor (this &rest params) + "Destructor for cleaning up any dynamic links to our object.") + +(defmethod destructor ((this eieio-default-superclass) &rest params) + "Destructor for cleaning up any dynamic links to our object. +Argument THIS is the object being destroyed. PARAMS are additional +ignored parameters." + ;; No cleanup... yet. + ) + +(defgeneric object-print (this &rest strings) + "Pretty printer for object THIS. Call function `object-name' with STRINGS. + +It is sometimes useful to put a summary of the object into the +default # string when using EIEIO browsing tools. +Implement this method to customize the summary.") + +(defmethod object-print ((this eieio-default-superclass) &rest strings) + "Pretty printer for object THIS. Call function `object-name' with STRINGS. +The default method for printing object THIS is to use the +function `object-name'. + +It is sometimes useful to put a summary of the object into the +default # string when using EIEIO browsing tools. + +Implement this function and specify STRINGS in a call to +`call-next-method' to provide additional summary information. +When passing in extra strings from child classes, always remember +to prepend a space." + (object-name this (apply 'concat strings))) + +(defvar eieio-print-depth 0 + "When printing, keep track of the current indentation depth.") + +(defgeneric object-write (this &optional comment) + "Write out object THIS to the current stream. +Optional COMMENT will add comments to the beginning of the output.") + +(defmethod object-write ((this eieio-default-superclass) &optional comment) + "Write object THIS out to the current stream. +This writes out the vector version of this object. Complex and recursive +object are discouraged from being written. + If optional COMMENT is non-nil, include comments when outputting +this object." + (when comment + (princ ";; Object ") + (princ (object-name-string this)) + (princ "\n") + (princ comment) + (princ "\n")) + (let* ((cl (object-class this)) + (cv (class-v cl))) + ;; Now output readable lisp to recreate this object + ;; It should look like this: + ;; ( ... ) + ;; Each slot's slot is writen using its :writer. + (princ (make-string (* eieio-print-depth 2) ? )) + (princ "(") + (princ (symbol-name (class-constructor (object-class this)))) + (princ " \"") + (princ (object-name-string this)) + (princ "\"\n") + ;; Loop over all the public slots + (let ((publa (aref cv class-public-a)) + (publd (aref cv class-public-d)) + (publp (aref cv class-public-printer)) + (eieio-print-depth (1+ eieio-print-depth))) + (while publa + (when (slot-boundp this (car publa)) + (let ((i (class-slot-initarg cl (car publa))) + (v (eieio-oref this (car publa))) + ) + (unless (or (not i) (equal v (car publd))) + (princ (make-string (* eieio-print-depth 2) ? )) + (princ (symbol-name i)) + (princ " ") + (if (car publp) + ;; Use our public printer + (funcall (car publp) v) + ;; Use our generic override prin1 function. + (eieio-override-prin1 v)) + (princ "\n")))) + (setq publa (cdr publa) publd (cdr publd) + publp (cdr publp))) + (princ (make-string (* eieio-print-depth 2) ? ))) + (princ ")\n"))) + +(defun eieio-override-prin1 (thing) + "Perform a `prin1' on THING taking advantage of object knowledge." + (cond ((eieio-object-p thing) + (object-write thing)) + ((listp thing) + (eieio-list-prin1 thing)) + ((class-p thing) + (princ (class-name thing))) + ((symbolp thing) + (princ (concat "'" (symbol-name thing)))) + (t (prin1 thing)))) + +(defun eieio-list-prin1 (list) + "Display LIST where list may contain objects." + (if (not (eieio-object-p (car list))) + (progn + (princ "'") + (prin1 list)) + (princ "(list ") + (if (eieio-object-p (car list)) (princ "\n ")) + (while list + (if (eieio-object-p (car list)) + (object-write (car list)) + (princ "'") + (prin1 (car list))) + (princ " ") + (setq list (cdr list))) + (princ (make-string (* eieio-print-depth 2) ? )) + (princ ")"))) + + +;;; Unimplemented functions from CLOS +;; +(defun change-class (obj class) + "Change the class of OBJ to type CLASS. +This may create or delete slots, but does not affect the return value +of `eq'." + (error "EIEIO: `change-class' is unimplemented")) + +) + + +;;; Interfacing with edebug +;; +(defun eieio-edebug-prin1-to-string (object &optional noescape) + "Display EIEIO OBJECT in fancy format. +Overrides the edebug default. +Optional argument NOESCAPE is passed to `prin1-to-string' when appropriate." + (cond ((class-p object) (class-name object)) + ((eieio-object-p object) (object-print object)) + ((and (listp object) (or (class-p (car object)) + (eieio-object-p (car object)))) + (concat "(" (mapconcat 'eieio-edebug-prin1-to-string object " ") ")")) + (t (prin1-to-string object noescape)))) + +(add-hook 'edebug-setup-hook + (lambda () + (def-edebug-spec defmethod + (&define ; this means we are defining something + [&or name ("setf" :name setf name)] + ;; ^^ This is the methods symbol + [ &optional symbolp ] ; this is key :before etc + list ; arguments + [ &optional stringp ] ; documentation string + def-body ; part to be debugged + )) + ;; The rest of the macros + (def-edebug-spec oref (form quote)) + (def-edebug-spec oref-default (form quote)) + (def-edebug-spec oset (form quote form)) + (def-edebug-spec oset-default (form quote form)) + (def-edebug-spec class-v form) + (def-edebug-spec class-p form) + (def-edebug-spec eieio-object-p form) + (def-edebug-spec class-constructor form) + (def-edebug-spec generic-p form) + (def-edebug-spec with-slots (list list def-body)) + ;; I suspect this isn't the best way to do this, but when + ;; cust-print was used on my system all my objects + ;; appeared as "#1 =" which was not useful. This allows + ;; edebug to print my objects in the nice way they were + ;; meant to with `object-print' and `class-name' + ;; (defalias 'edebug-prin1-to-string 'eieio-edebug-prin1-to-string) + ) + ) + +;;; Interfacing with imenu in emacs lisp mode +;; (Only if the expression is defined) +;; +(if (eval-when-compile (boundp 'list-imenu-generic-expression)) +(progn + +(defun eieio-update-lisp-imenu-expression () + "Examine `lisp-imenu-generic-expression' and modify it to find `defmethod'." + (let ((exp lisp-imenu-generic-expression)) + (while exp + ;; it's of the form '( ( title expr indx ) ... ) + (let* ((subcar (cdr (car exp))) + (substr (car subcar))) + (if (and (not (string-match "|method\\\\" substr)) + (string-match "|advice\\\\" substr)) + (setcar subcar + (replace-match "|advice\\|method\\" t t substr 0)))) + (setq exp (cdr exp))))) + +(eieio-update-lisp-imenu-expression) + +)) + +;;; Autoloading some external symbols, and hooking into the help system +;; + + +;;; Start of automatically extracted autoloads. + +;;;### (autoloads (customize-object) "eieio-custom" "eieio-custom.el" +;;;;;; "cf1bd64c76a6e6406545e8c5a5530d43") +;;; Generated autoloads from eieio-custom.el + +(autoload 'customize-object "eieio-custom" "\ +Customize OBJ in a custom buffer. +Optional argument GROUP is the sub-group of slots to display. + +\(fn OBJ &optional GROUP)" nil nil) + +;;;*** + +;;;### (autoloads (eieio-help-mode-augmentation-maybee eieio-describe-generic +;;;;;; eieio-describe-constructor eieio-describe-class eieio-browse) +;;;;;; "eieio-opt" "eieio-opt.el" "1bed0a56310f402683419139ebc18d7f") +;;; Generated autoloads from eieio-opt.el + +(autoload 'eieio-browse "eieio-opt" "\ +Create an object browser window to show all objects. +If optional ROOT-CLASS, then start with that, otherwise start with +variable `eieio-default-superclass'. + +\(fn &optional ROOT-CLASS)" t nil) + +(defalias 'describe-class 'eieio-describe-class) + +(autoload 'eieio-describe-class "eieio-opt" "\ +Describe a CLASS defined by a string or symbol. +If CLASS is actually an object, then also display current values of that object. +Optional HEADERFCN should be called to insert a few bits of info first. + +\(fn CLASS &optional HEADERFCN)" t nil) + +(autoload 'eieio-describe-constructor "eieio-opt" "\ +Describe the constructor function FCN. +Uses `eieio-describe-class' to describe the class being constructed. + +\(fn FCN)" t nil) + +(defalias 'describe-generic 'eieio-describe-generic) + +(autoload 'eieio-describe-generic "eieio-opt" "\ +Describe the generic function GENERIC. +Also extracts information about all methods specific to this generic. + +\(fn GENERIC)" t nil) + +(autoload 'eieio-help-mode-augmentation-maybee "eieio-opt" "\ +For buffers thrown into help mode, augment for EIEIO. +Arguments UNUSED are not used. + +\(fn &rest UNUSED)" nil nil) + +;;;*** + +;;; End of automatically extracted autoloads. + +(provide 'eieio) + +;;; eieio ends here