bovine-grammar.el 19.6 KB
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;;; bovine-grammar.el --- Bovine's input grammar mode
;;
;; Copyright (C) 2002-2011 Free Software Foundation, Inc.
;;
;; Author: David Ponce <david@dponce.com>
;; Maintainer: David Ponce <david@dponce.com>
;; Created: 26 Aug 2002
;; 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:
;;
;; Major mode for editing Bovine's input grammar (.by) files.

;;; History:

;;; Code:
(require 'semantic)
(require 'semantic/grammar)
(require 'semantic/find)
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(require 'semantic/lex)
(require 'semantic/wisent)
(require 'semantic/bovine)
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(defun bovine-grammar-EXPAND (bounds nonterm)
  "Expand call to EXPAND grammar macro.
Return the form to parse from within a nonterminal between BOUNDS.
NONTERM is the nonterminal symbol to start with."
  `(semantic-bovinate-from-nonterminal
    (car ,bounds) (cdr ,bounds) ',nonterm))

(defun bovine-grammar-EXPANDFULL (bounds nonterm)
  "Expand call to EXPANDFULL grammar macro.
Return the form to recursively parse the area between BOUNDS.
NONTERM is the nonterminal symbol to start with."
  `(semantic-parse-region
    (car ,bounds) (cdr ,bounds) ',nonterm 1))

(defun bovine-grammar-TAG (name class &rest attributes)
  "Expand call to TAG grammar macro.
Return the form to create a generic semantic tag.
See the function `semantic-tag' for the meaning of arguments NAME,
CLASS and ATTRIBUTES."
  `(semantic-tag ,name ,class ,@attributes))

(defun bovine-grammar-VARIABLE-TAG (name type default-value &rest attributes)
  "Expand call to VARIABLE-TAG grammar macro.
Return the form to create a semantic tag of class variable.
See the function `semantic-tag-new-variable' for the meaning of
arguments NAME, TYPE, DEFAULT-VALUE and ATTRIBUTES."
  `(semantic-tag-new-variable ,name ,type ,default-value ,@attributes))

(defun bovine-grammar-FUNCTION-TAG (name type arg-list &rest attributes)
  "Expand call to FUNCTION-TAG grammar macro.
Return the form to create a semantic tag of class function.
See the function `semantic-tag-new-function' for the meaning of
arguments NAME, TYPE, ARG-LIST and ATTRIBUTES."
  `(semantic-tag-new-function ,name ,type ,arg-list ,@attributes))

(defun bovine-grammar-TYPE-TAG (name type members parents &rest attributes)
  "Expand call to TYPE-TAG grammar macro.
Return the form to create a semantic tag of class type.
See the function `semantic-tag-new-type' for the meaning of arguments
NAME, TYPE, MEMBERS, PARENTS and ATTRIBUTES."
  `(semantic-tag-new-type ,name ,type ,members ,parents ,@attributes))

(defun bovine-grammar-INCLUDE-TAG (name system-flag &rest attributes)
  "Expand call to INCLUDE-TAG grammar macro.
Return the form to create a semantic tag of class include.
See the function `semantic-tag-new-include' for the meaning of
arguments NAME, SYSTEM-FLAG and ATTRIBUTES."
  `(semantic-tag-new-include ,name ,system-flag ,@attributes))

(defun bovine-grammar-PACKAGE-TAG (name detail &rest attributes)
  "Expand call to PACKAGE-TAG grammar macro.
Return the form to create a semantic tag of class package.
See the function `semantic-tag-new-package' for the meaning of
arguments NAME, DETAIL and ATTRIBUTES."
  `(semantic-tag-new-package ,name ,detail ,@attributes))

(defun bovine-grammar-CODE-TAG (name detail &rest attributes)
  "Expand call to CODE-TAG grammar macro.
Return the form to create a semantic tag of class code.
See the function `semantic-tag-new-code' for the meaning of arguments
NAME, DETAIL and ATTRIBUTES."
  `(semantic-tag-new-code ,name ,detail ,@attributes))

(defun bovine-grammar-ALIAS-TAG (name aliasclass definition &rest attributes)
  "Expand call to ALIAS-TAG grammar macro.
Return the form to create a semantic tag of class alias.
See the function `semantic-tag-new-alias' for the meaning of arguments
NAME, ALIASCLASS, DEFINITION and ATTRIBUTES."
  `(semantic-tag-new-alias ,name ,aliasclass ,definition ,@attributes))

;; Cache of macro definitions currently in use.
(defvar bovine--grammar-macros nil)

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;; Detect if we have an Emacs with newstyle unquotes allowed outside
;; of backquote.
;; This should probably be changed to a test to (= emacs-major-version 24)
;; when it is released, but at the moment it might be possible that people
;; are using an older snapshot.
(defvar bovine--grammar-newstyle-unquote
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  (equal '(\, test) (read ",test")))
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(defun bovine-grammar-expand-form (form quotemode &optional inplace)
  "Expand FORM into a new one suitable to the bovine parser.
FORM is a list in which we are substituting.
Argument QUOTEMODE is non-nil if we are in backquote mode.
When non-nil, optional argument INPLACE indicates that FORM is being
expanded from elsewhere."
  (when (eq (car form) 'quote)
    (setq form (cdr form))
    (cond
     ((and (= (length form) 1) (listp (car form)))
      (insert "\n(append")
      (bovine-grammar-expand-form (car form) quotemode nil)
      (insert ")")
      (setq form nil inplace nil)
      )
     ((and (= (length form) 1) (symbolp (car form)))
      (insert "\n'" (symbol-name (car form)))
      (setq form nil inplace nil)
      )
     (t
      (insert "\n(list")
      (setq inplace t)
      )))
  (let ((macro (assq (car form) bovine--grammar-macros))
        inlist first n q x)
    (if macro
        (bovine-grammar-expand-form
         (apply (cdr macro) (cdr form))
         quotemode t)
      (if inplace (insert "\n("))
      (while form
        (setq first (car form)
              form  (cdr form))
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	;; Hack for dealing with new reading of unquotes outside of
	;; backquote (introduced in rev. 102591 in emacs-bzr).
	(when (and bovine--grammar-newstyle-unquote
		   (listp first)
		   (or (equal (car first) '\,)
		       (equal (car first) '\,@)))
	  (if (listp (cadr first))
	      (setq form (append (cdr first) form)
		    first (car first))
	    (setq first (intern (concat (symbol-name (car first))
					(symbol-name (cadr first)))))))
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        (cond
         ((eq first nil)
          (when (and (not inlist) (not inplace))
            (insert "\n(list")
            (setq inlist t))
          (insert " nil")
          )
         ((listp first)
          ;;(let ((fn (and (symbolp (caar form)) (fboundp (caar form)))))
          (when (and (not inlist) (not inplace))
            (insert "\n(list")
            (setq inlist t))
          ;;(if (and inplace (not fn) (not (eq (caar form) 'EXPAND)))
          ;;    (insert " (append"))
          (bovine-grammar-expand-form
           first quotemode t) ;;(and fn (not (eq fn 'quote))))
          ;;(if (and inplace (not fn) (not (eq (caar form) 'EXPAND)))
          ;;    (insert  ")"))
          ;;)
          )
         ((symbolp first)
          (setq n (symbol-name first)   ;the name
                q quotemode             ;implied quote flag
                x nil)                  ;expand flag
          (if (eq (aref n 0) ?,)
              (if quotemode
                  ;; backquote mode needs the @
                  (if (eq (aref n 1) ?@)
                      (setq n (substring n 2)
                            q nil
                            x t)
                    ;; non backquote mode behaves normally.
                    (setq n (substring n 1)
                          q nil))
                (setq n (substring n 1)
                      x t)))
          (if (string= n "")
              (progn
                ;; We expand only the next item in place (a list?)
                ;; A regular inline-list...
                (bovine-grammar-expand-form (car form) quotemode t)
                (setq form (cdr form)))
            (if (and (eq (aref n 0) ?$)
                     ;; Don't expand $ tokens in implied quote mode.
                     ;; This acts like quoting in other symbols.
                     (not q))
                (progn
                  (cond
                   ((and (not x) (not inlist) (not inplace))
                    (insert "\n(list"))
                   ((and x inlist (not inplace))
                    (insert ")")
                    (setq inlist nil)))
                  (insert "\n(nth " (int-to-string
                                     (1- (string-to-number
                                          (substring n 1))))
                          " vals)")
                  (and (not x) (not inplace)
                       (setq inlist t)))

              (when (and (not inlist) (not inplace))
                (insert "\n(list")
                (setq inlist t))
              (or (char-equal (char-before) ?\()
                  (insert " "))
              (insert (if (or inplace (eq first t))
                          "" "'")
                      n))) ;; " "
          )
         (t
          (when (and (not inlist) (not inplace))
            (insert "\n(list")
            (setq inlist t))
          (insert (format "\n%S" first))
          )
         ))
      (if inlist (insert ")"))
      (if inplace (insert ")")))
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    ))
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(defun bovine-grammar-expand-action (textform quotemode)
  "Expand semantic action string TEXTFORM into Lisp code.
QUOTEMODE is the mode in which quoted symbols are slurred."
  (if (string= "" textform)
      nil
    (let ((sexp (read textform)))
      ;; We converted the lambda string into a list.  Now write it
      ;; out as the bovine lambda expression, and do macro-like
      ;; conversion upon it.
      (insert "\n")
      (cond
       ((eq (car sexp) 'EXPAND)
        (insert ",(lambda (vals start end)")
        ;; The EXPAND macro definition is mandatory
        (bovine-grammar-expand-form
         (apply (cdr (assq 'EXPAND bovine--grammar-macros)) (cdr sexp))
         quotemode t)
        )
       ((and (listp (car sexp)) (eq (caar sexp) 'EVAL))
        ;; The user wants to evaluate the following args.
        ;; Use a simpler expander
        )
       (t
        (insert ",(semantic-lambda")
        (bovine-grammar-expand-form sexp quotemode)
        ))
      (insert ")\n")))
)

(defun bovine-grammar-parsetable-builder ()
  "Return the parser table expression as a string value.
The format of a bovine parser table is:

 ( ( NONTERMINAL-SYMBOL1 MATCH-LIST1 )
   ( NONTERMINAL-SYMBOL2 MATCH-LIST2 )
   ...
   ( NONTERMINAL-SYMBOLn MATCH-LISTn )

Where each NONTERMINAL-SYMBOL is an artificial symbol which can appear
in any child state.  As a starting place, one of the NONTERMINAL-SYMBOLS
must be `bovine-toplevel'.

A MATCH-LIST is a list of possible matches of the form:

 ( STATE-LIST1
   STATE-LIST2
   ...
   STATE-LISTN )

where STATE-LIST is of the form:
  ( TYPE1 [ \"VALUE1\" ] TYPE2 [ \"VALUE2\" ] ... LAMBDA )

where TYPE is one of the returned types of the token stream.
VALUE is a value, or range of values to match against.  For
example, a SYMBOL might need to match \"foo\".  Some TYPES will not
have matching criteria.

Paul Eggert's avatar
Paul Eggert committed
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LAMBDA is a lambda expression which is evalled with the text of the
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type when it is found.  It is passed the list of all buffer text
elements found since the last lambda expression.  It should return a
semantic element (see below.)

For consistency between languages, try to use common return values
from your parser.  Please reference the chapter \"Writing Parsers\" in
the \"Language Support Developer's Guide -\" in the semantic texinfo
manual."
  (let* ((start      (semantic-grammar-start))
         (scopestart (semantic-grammar-scopestart))
         (quotemode  (semantic-grammar-quotemode))
         (tags       (semantic-find-tags-by-class
                      'token (current-buffer)))
         (nterms     (semantic-find-tags-by-class
                      'nonterminal (current-buffer)))
         ;; Setup the cache of macro definitions.
         (bovine--grammar-macros (semantic-grammar-macros))
         nterm rules items item actn prec tag type regex)

    ;; Check some trivial things
    (cond
     ((null nterms)
      (error "Bad input grammar"))
     (start
      (if (cdr start)
          (message "Extra start symbols %S ignored" (cdr start)))
      (setq start (symbol-name (car start)))
      (unless (semantic-find-first-tag-by-name start nterms)
        (error "start symbol `%s' has no rule" start)))
     (t
      ;; Default to the first grammar rule.
      (setq start (semantic-tag-name (car nterms)))))
    (when scopestart
      (setq scopestart (symbol-name scopestart))
      (unless (semantic-find-first-tag-by-name scopestart nterms)
        (error "scopestart symbol `%s' has no rule" scopestart)))

    ;; Generate the grammar Lisp form.
    (with-temp-buffer
      (erase-buffer)
      (insert "`(")
      ;; Insert the start/scopestart rules
      (insert "\n(bovine-toplevel \n("
              start
              ")\n) ;; end bovine-toplevel\n")
      (when scopestart
        (insert "\n(bovine-inner-scope \n("
                scopestart
                ")\n) ;; end bovine-inner-scope\n"))
      ;; Process each nonterminal
      (while nterms
        (setq nterm  (car nterms)
              ;; We can't use the override form because the current buffer
              ;; is not the originator of the tag.
              rules  (semantic-tag-components-semantic-grammar-mode nterm)
              nterm  (semantic-tag-name nterm)
              nterms (cdr nterms))
        (when (member nterm '("bovine-toplevel" "bovine-inner-scope"))
          (error "`%s' is a reserved internal name" nterm))
        (insert "\n(" nterm)
        ;; Process each rule
        (while rules
          (setq items (semantic-tag-get-attribute (car rules) :value)
                prec  (semantic-tag-get-attribute (car rules) :prec)
                actn  (semantic-tag-get-attribute (car rules) :expr)
                rules (cdr rules))
          ;; Process each item
          (insert "\n(")
          (if (null items)
              ;; EMPTY rule
              (insert ";;EMPTY" (if actn "" "\n"))
            ;; Expand items
            (while items
              (setq item  (car items)
                    items (cdr items))
              (if (consp item) ;; mid-rule action
                  (message "Mid-rule action %S ignored" item)
                (or (char-equal (char-before) ?\()
                    (insert "\n"))
                (cond
                 ((member item '("bovine-toplevel" "bovine-inner-scope"))
                  (error "`%s' is a reserved internal name" item))
                 ;; Replace ITEM by its %token definition.
                 ;; If a '%token TYPE ITEM [REGEX]' definition exists
                 ;; in the grammar, ITEM is replaced by TYPE [REGEX].
                 ((setq tag (semantic-find-first-tag-by-name
                             item tags)
                        type  (semantic-tag-get-attribute tag :type))
                  (insert type)
                  (if (setq regex (semantic-tag-get-attribute tag :value))
                      (insert (format "\n%S" regex))))
                 ;; Don't change ITEM
                 (t
                  (insert (semantic-grammar-item-text item)))
                 ))))
          (if prec
              (message "%%prec %S ignored" prec))
          (if actn
              (bovine-grammar-expand-action actn quotemode))
          (insert ")"))
        (insert "\n) ;; end " nterm "\n"))
      (insert ")\n")
      (buffer-string))))

(defun bovine-grammar-setupcode-builder ()
  "Return the text of the setup code."
  (format
   "(setq semantic--parse-table %s\n\
          semantic-debug-parser-source %S\n\
          semantic-debug-parser-class 'semantic-bovine-debug-parser
          semantic-flex-keywords-obarray %s\n\
          %s)"
   (semantic-grammar-parsetable)
   (buffer-name)
   (semantic-grammar-keywordtable)
   (let ((mode (semantic-grammar-languagemode)))
     ;; Is there more than one major mode?
     (if (and (listp mode) (> (length mode) 1))
         (format "semantic-equivalent-major-modes '%S\n" mode)
       ""))))

(defvar bovine-grammar-menu
  '("BY Grammar"
    )
  "BY mode specific grammar menu.
Menu items are appended to the common grammar menu.")

(define-derived-mode bovine-grammar-mode semantic-grammar-mode "BY"
  "Major mode for editing Bovine grammars."
  (semantic-grammar-setup-menu bovine-grammar-menu)
  (semantic-install-function-overrides
   '((grammar-parsetable-builder . bovine-grammar-parsetable-builder)
     (grammar-setupcode-builder  . bovine-grammar-setupcode-builder)
     )))

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(add-to-list 'auto-mode-alist '("\\.by\\'" . bovine-grammar-mode))
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(defvar-mode-local bovine-grammar-mode semantic-grammar-macros
  '(
    (ASSOC          . semantic-grammar-ASSOC)
    (EXPAND         . bovine-grammar-EXPAND)
    (EXPANDFULL     . bovine-grammar-EXPANDFULL)
    (TAG            . bovine-grammar-TAG)
    (VARIABLE-TAG   . bovine-grammar-VARIABLE-TAG)
    (FUNCTION-TAG   . bovine-grammar-FUNCTION-TAG)
    (TYPE-TAG       . bovine-grammar-TYPE-TAG)
    (INCLUDE-TAG    . bovine-grammar-INCLUDE-TAG)
    (PACKAGE-TAG    . bovine-grammar-PACKAGE-TAG)
    (CODE-TAG       . bovine-grammar-CODE-TAG)
    (ALIAS-TAG      . bovine-grammar-ALIAS-TAG)
    )
  "Semantic grammar macros used in bovine grammars.")

(provide 'semantic/bovine/grammar)

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(defun bovine-make-parsers ()
  "Generate Emacs' built-in Bovine-based parser files."
  (semantic-mode 1)
  ;; Loop through each .by file in current directory, and run
  ;; `semantic-grammar-batch-build-one-package' to build the grammar.
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  (dolist (f (directory-files default-directory nil "\\.by\\'"))
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    (let ((packagename
           (condition-case err
               (with-current-buffer (find-file-noselect f)
                 (semantic-grammar-create-package))
             (error (message "%s" (error-message-string err)) nil)))
	  lang)
      (when (and packagename
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		 (string-match "^semantic-\\(.*\\)-by\\.el\\'" packagename))
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	(setq lang (match-string 1 packagename))
	(with-temp-buffer
	  (insert-file-contents packagename)
	  (setq buffer-file-name (expand-file-name packagename))
	  ;; Fix copyright header:
	  (goto-char (point-min))
	  (re-search-forward "^;; Author:")
	  (setq copyright-end (match-beginning 0))
	  (re-search-forward "^;;; Code:\n")
	  (delete-region copyright-end (match-end 0))
	  (goto-char copyright-end)
	  (insert ";; 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:
;;
;; This file was generated from admin/grammars/"
		  lang ".by.

;;; Code:

\(require 'semantic/lex)
\(eval-when-compile (require 'semantic/bovine))\n")
	  (goto-char (point-min))
	  (delete-region (point-min) (line-end-position))
	  (insert ";;; semantic/bovine/" lang
		  "-by.el --- Generated parser support file")
	  (delete-trailing-whitespace)
	  ;; Fix footer:
	  (goto-char (point-max))
	  (re-search-backward ".\n;;; Analyzers")
	  (delete-region (point) (point-max))
	  (insert "(provide 'semantic/bovine/" lang "-by)\n\n")
	  (insert ";;; semantic/bovine/" lang "-by.el ends here\n")
	  (save-buffer))))))

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;;; bovine-grammar.el ends here