;;; semantic/wisent/javascript.el --- javascript parser support

;; Copyright (C) 2005, 2009-2013 Free Software Foundation, Inc.

;; Author: Eric Ludlam <zappo@gnu.org>
;; Keywords: syntax

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; Parser support for javascript language.


;;; Code:
(require 'semantic/java)
(require 'semantic/wisent)
(require 'semantic/wisent/javascript-wy)

(defun wisent-javascript-expand-tag (tag)
  "Expand TAG into a list of equivalent tags, or nil.
Expand multiple variable declarations in the same statement, that is
tags of class `variable' whose name is equal to a list of elements of
the form (NAME VALUE START . END).  NAME is a variable name.  VALUE is
an initializer START and END are the bounds in the declaration, related
to this variable NAME."
  (let (elts elt value clone start end xpand)
    (when (and (eq 'variable (semantic-tag-class tag))
               (consp (setq elts (semantic-tag-name tag))))
      ;; There are multiple names in the same variable declaration.
      (while elts
        ;; For each name element, clone the initial tag and give it
        ;; the name of the element.
        (setq elt   (car elts)
              elts  (cdr elts)
              clone (semantic-tag-clone tag (car elt))
	      value (car (cdr elt))
	      start (if elts  (car (cddr elt)) (semantic-tag-start tag))
	      end   (if xpand (cdr (cddr elt)) (semantic-tag-end   tag))
              xpand (cons clone xpand))
        ;; Set the definition of the cloned tag
        (semantic-tag-put-attribute clone :default-value value)
        ;; Set the bounds of the cloned tag with those of the name
        ;; element.
        (semantic-tag-set-bounds clone start end))
      xpand)))

;;; Override Methods
;;
;; These methods override aspects of how semantic-tools can access
;; the tags created by the javascript parser.
;; Local context
(define-mode-local-override semantic-get-local-variables
  javascript-mode ()
  "Get local values from a specific context.
This function overrides `get-local-variables'."
  ;; Does javascript have identifiable local variables?
  nil)

(define-mode-local-override semantic-tag-protection javascript-mode (tag &optional parent)
  "Return protection information about TAG with optional PARENT.
This function returns on of the following symbols:
   nil        - No special protection.  Language dependent.
   'public    - Anyone can access this TAG.
   'private   - Only methods in the local scope can access TAG.
   'protected - Like private for outside scopes, like public for child
                classes.
Some languages may choose to provide additional return symbols specific
to themselves.  Use of this function should allow for this.

The default behavior (if not overridden with `tag-protection'
is to return a symbol based on type modifiers."
  nil)

(define-mode-local-override semantic-analyze-scope-calculate-access javascript-mode (type scope)
  "Calculate the access class for TYPE as defined by the current SCOPE.
Access is related to the :parents in SCOPE.  If type is a member of SCOPE
then access would be 'private.  If TYPE is inherited by a member of SCOPE,
the access would be 'protected.  Otherwise, access is 'public."
  nil)

(define-mode-local-override semantic-ctxt-current-symbol javascript-mode (&optional point)
  "Return the current symbol the cursor is on at POINT in a list.
This is a very simple implementation for Javascript symbols.  It
will at maximum do one split, so that the first part is seen as
one type.  For example:  $('#sel').foo.bar will return (\"$('sel').foo\" \"bar\").
This is currently needed for the mozrepl omniscient database."
  (save-excursion
    (if point (goto-char point))
    (let* ((case-fold-search semantic-case-fold)
	   symlist tmp end)
      (with-syntax-table semantic-lex-syntax-table
	(save-excursion
	  (when (looking-at "\\w\\|\\s_")
	    (forward-sexp 1))
	  (setq end (point))
	  (unless (re-search-backward "\\s-" (point-at-bol) t)
	    (beginning-of-line))
	  (setq tmp (buffer-substring-no-properties (point) end))
	  (if (string-match "\\(.+\\)\\." tmp)
	    (setq symlist (list (match-string 1 tmp)
				(substring tmp (1+ (match-end 1)) (length tmp))))
	    (setq symlist (list tmp))))))))
	  
;;; Setup Function
;;
;; Since javascript-mode is an alias for js-mode, let it inherit all
;; the overrides.
(define-child-mode js-mode javascript-mode)

;; In semantic-imenu.el, not part of Emacs.
(defvar semantic-imenu-summary-function)

;;;###autoload
(defun wisent-javascript-setup-parser ()
  "Setup buffer for parse."
  (wisent-javascript-wy--install-parser)
  (setq
   ;; Lexical Analysis
   semantic-lex-analyzer 'javascript-lexer
   semantic-lex-number-expression semantic-java-number-regexp
   ;; semantic-lex-depth nil ;; Full lexical analysis
   ;; Parsing
   semantic-tag-expand-function 'wisent-javascript-expand-tag
   ;; Environment
   semantic-imenu-summary-function 'semantic-format-tag-name
   imenu-create-index-function 'semantic-create-imenu-index
   semantic-command-separation-character ";"
   ))

(provide 'semantic/wisent/javascript)

;; Local variables:
;; generated-autoload-file: "../loaddefs.el"
;; generated-autoload-load-name: "semantic/wisent/javascript"
;; End:

;;; semantic/wisent/javascript.el ends here
