;;; semantic-html.el --- Semantic details for html files

;;; Copyright (C) 2004, 2005, 2007 Eric M. Ludlam

;; Author: Eric M. Ludlam <zappo@gnu.org>
;; X-RCS: $Id: semantic-html.el,v 1.1 2007-11-26 15:10:38 michaels Exp $

;; This file is not part of GNU Emacs.

;; This 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 2, or (at your option)
;; any later version.

;; This software 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:
;;
;; Parse HTML files and organize them in a nice way.
;; Pay attention to anchors, including them in the tag list.
;;
;; Copied from the original semantic-texi.el.
;;
;; ToDo: Find <script> tags, and parse the contents in other
;; parsers, such as javascript, php, shtml, or others.

(require 'semantic)
(require 'semantic-format)
(require 'sgml-mode) ;; html-mode is in here.

;;; Code:
(eval-when-compile
  (require 'semantic-ctxt)
  (require 'semantic-imenu)
  (require 'senator))

(defvar semantic-html-super-regex
  "<\\(h[1-9]\\|title\\|script\\|body\\|a +href\\)\\>"
  "Regular expression used to find special sections in an HTML file.")

(defvar semantic-html-section-list
  '(("title" 1)
    ("script" 1)
    ("body" 1)
    ("a" 11)
    ("h1" 2)
    ("h2" 3)
    ("h3" 4)
    ("h4" 5)
    ("h5" 6)
    ("h6" 7)
    ("h7" 8)
    ("h8" 9)
    ("h9" 10)
    )
  "Alist of sectioning commands and their relative level.")

(define-mode-local-override semantic-parse-region
  html-mode (&rest ignore)
  "Parse the current html buffer for semantic tags.
INGNORE any arguments.  Always parse the whole buffer.
Each tag returned is of the form:
 (\"NAME\" section (:members CHILDREN))
or
 (\"NAME\" anchor)"
  (mapcar 'semantic-html-expand-tag
	  (semantic-html-parse-headings)))

(define-mode-local-override semantic-parse-changes
  html-mode ()
  "We can't parse changes for HTML mode right now."
  (semantic-parse-tree-set-needs-rebuild))

(defun semantic-html-expand-tag (tag)
  "Expand the HTML tag TAG."
  (let ((chil (semantic-html-components tag)))
    (if chil
        (semantic-tag-put-attribute
         tag :members (mapcar 'semantic-html-expand-tag chil)))
    (car (semantic--tag-expand tag))))

(defun semantic-html-components (tag)
  "Return components belonging to TAG."
  (semantic-tag-get-attribute tag :members))

(defun semantic-html-parse-headings ()
  "Parse the current html buffer for all semantic tags."
  (let ((pass1 nil))
    ;; First search and snarf.
    (save-excursion
      (goto-char (point-min))
      (working-status-forms (file-name-nondirectory buffer-file-name) "done"
	(while (re-search-forward semantic-html-super-regex nil t)
	  (setq pass1 (cons (match-beginning 0) pass1))
	  (working-status)
	  )
	(working-status t)))
    (setq pass1 (nreverse pass1))
    ;; Now, make some tags while creating a set of children.
    (car (semantic-html-recursive-combobulate-list pass1 0))
    ))

(defun semantic-html-set-endpoint (metataglist pnt)
  "Set the end point of the first section tag in METATAGLIST to PNT.
METATAGLIST is a list of tags in the intermediate tag format used by the
html parser.  PNT is the new point to set."
  (let ((metatag nil))
    (while (and metataglist
		(not (eq (semantic-tag-class (car metataglist)) 'section)))
      (setq metataglist (cdr metataglist)))
    (setq metatag (car metataglist))
    (when metatag
      (setcar (nthcdr (1- (length metatag)) metatag) pnt)
      metatag)))

(defsubst semantic-html-new-section-tag (name members start end)
  "Create a semantic tag of class section.
NAME is the name of this section.
MEMBERS is a list of semantic tags representing the elements that make
up this section.
START and END define the location of data described by the tag."
  (append (semantic-tag name 'section :members members)
          (list start end)))

(defun semantic-html-extract-section-name ()
  "Extract a section name from the current buffer and point.
Assume the cursor is in the tag representing the section we
need the name from."
  (save-excursion
    ; Skip over the HTML tag.
    (forward-sexp -1)
    (forward-char -1)
    (forward-sexp 1)
    (skip-chars-forward "\n\t ")
    (while (looking-at "<")
      (forward-sexp 1)
      (skip-chars-forward "\n\t ")
      )
    (let ((start (point))
	  (end nil))
      (if (re-search-forward "</" nil t)
	  (progn
	    (goto-char (match-beginning 0))
	    (skip-chars-backward " \n\t")
	    (setq end (point))
	    (buffer-substring-no-properties start end))
	""))
    ))

(defun semantic-html-recursive-combobulate-list (sectionlist level)
  "Rearrange SECTIONLIST to be a hierarchical tag list starting at LEVEL.
Return the rearranged new list, with all remaining tags from
SECTIONLIST starting at ELT 2.  Sections not are not dealt with as soon as a
tag with greater section value than LEVEL is found."
  (let ((newl nil)
	(oldl sectionlist)
	(case-fold-search t)
        tag
	)
    (save-excursion
      (catch 'level-jump
	(while oldl
	  (goto-char (car oldl))
	  (if (looking-at "<\\(\\w+\\)")
	      (let* ((word (match-string 1))
		     (levelmatch (assoc-ignore-case
                                  word semantic-html-section-list))
		     text begin tmp
		     )
		(when (not levelmatch)
		  (error "Tag %s matched in regexp but is not in list"
			 word))
		;; Set begin to the right location
		(setq begin (point))
		;; Get out of here if there if we made it that far.
		(if (and levelmatch (<= (car (cdr levelmatch)) level))
		    (progn
		      (when newl
			(semantic-html-set-endpoint newl begin))
		      (throw 'level-jump t)))
		;; When there is a match, the descriptive text
		;; consists of the rest of the line.
		(goto-char (match-end 1))
		(skip-chars-forward " \t")
		(setq text (semantic-html-extract-section-name))
		;; Next, recurse into the body to find the end.
		(setq tmp (semantic-html-recursive-combobulate-list
			   (cdr oldl) (car (cdr levelmatch))))
		;; Build a tag
		(setq tag (semantic-html-new-section-tag
			   text (car tmp) begin (point)))
		;; Before appending the newtag, update the previous tag
		;; if it is a section tag.
		(when newl
		  (semantic-html-set-endpoint newl begin))
		;; Append new tag to our master list.
		(setq newl (cons tag newl))
		;; continue
		(setq oldl (cdr tmp))
		)
	    (error "Problem finding section in semantic/html parser"))
	  ;; (setq oldl (cdr oldl))
	  )))
    (cons (nreverse newl) oldl)))

(define-mode-local-override semantic-sb-tag-children-to-expand
  html-mode (tag)
  "The children TAG expands to."
  (semantic-html-components tag))

;;;###autoload
(defun semantic-default-html-setup ()
  "Set up a buffer for parsing of HTML files."
  ;; This will use our parser.
  (setq semantic-parser-name "HTML"
        semantic--parse-table t
        imenu-create-index-function 'semantic-create-imenu-index
	semantic-command-separation-character ">"
	semantic-type-relation-separator-character '(":")
	semantic-symbol->name-assoc-list '((section . "Section")
					   
					   )
	semantic-imenu-expandable-tag-classes 'section
	semantic-imenu-bucketize-file nil
	semantic-imenu-bucketize-type-members nil
	senator-step-at-start-end-tag-classes '(section)
	semantic-stickyfunc-sticky-classes '(section)
	)
  (semantic-install-function-overrides
   '((tag-components . semantic-html-components)
     )
   t)
  )

;;;###autoload
(add-hook 'html-mode-hook 'semantic-default-html-setup)

(define-child-mode html-helper-mode html-mode
  "`html-helper-mode' needs the same semantic support as `html-mode'.")

(provide 'semantic-html)

;;; semantic-html.el ends here