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276 lines
12 KiB
EmacsLisp
276 lines
12 KiB
EmacsLisp
8 months ago
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;;; gyp.el - font-lock-mode support for gyp files.
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;; Copyright (c) 2012 Google Inc. All rights reserved.
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;; Use of this source code is governed by a BSD-style license that can be
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;; found in the LICENSE file.
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;; Put this somewhere in your load-path and
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;; (require 'gyp)
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(require 'python)
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(require 'cl)
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(when (string-match "python-mode.el" (symbol-file 'python-mode 'defun))
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(error (concat "python-mode must be loaded from python.el (bundled with "
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"recent emacsen), not from the older and less maintained "
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"python-mode.el")))
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(defadvice python-indent-calculate-levels (after gyp-outdent-closing-parens
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activate)
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"De-indent closing parens, braces, and brackets in gyp-mode."
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(when (and (eq major-mode 'gyp-mode)
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(string-match "^ *[])}][],)}]* *$"
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(buffer-substring-no-properties
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(line-beginning-position) (line-end-position))))
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(setf (first python-indent-levels)
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(- (first python-indent-levels) python-continuation-offset))))
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(defadvice python-indent-guess-indent-offset (around
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gyp-indent-guess-indent-offset
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activate)
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"Guess correct indent offset in gyp-mode."
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(or (and (not (eq major-mode 'gyp-mode))
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ad-do-it)
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(save-excursion
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(save-restriction
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(widen)
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(goto-char (point-min))
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;; Find first line ending with an opening brace that is not a comment.
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(or (and (re-search-forward "\\(^[[{]$\\|^.*[^#].*[[{]$\\)")
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(forward-line)
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(/= (current-indentation) 0)
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(set (make-local-variable 'python-indent-offset)
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(current-indentation))
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(set (make-local-variable 'python-continuation-offset)
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(current-indentation)))
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(message "Can't guess gyp indent offset, using default: %s"
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python-continuation-offset))))))
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(define-derived-mode gyp-mode python-mode "Gyp"
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"Major mode for editing .gyp files. See http://code.google.com/p/gyp/"
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;; gyp-parse-history is a stack of (POSITION . PARSE-STATE) tuples,
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;; with greater positions at the top of the stack. PARSE-STATE
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;; is a list of section symbols (see gyp-section-name and gyp-parse-to)
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;; with most nested section symbol at the front of the list.
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(set (make-local-variable 'gyp-parse-history) '((1 . (list))))
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(gyp-add-font-lock-keywords))
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(defun gyp-set-indentation ()
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"Hook function to configure python indentation to suit gyp mode."
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(set (make-local-variable 'python-indent-offset) 2)
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(set (make-local-variable 'python-continuation-offset) 2)
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(set (make-local-variable 'python-indent-guess-indent-offset) t)
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(python-indent-guess-indent-offset))
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(add-hook 'gyp-mode-hook 'gyp-set-indentation)
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(add-to-list 'auto-mode-alist '("\\.gyp\\'" . gyp-mode))
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(add-to-list 'auto-mode-alist '("\\.gypi\\'" . gyp-mode))
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(add-to-list 'auto-mode-alist '("/\\.gclient\\'" . gyp-mode))
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;;; Font-lock support
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(defconst gyp-dependencies-regexp
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(regexp-opt (list "dependencies" "export_dependent_settings"))
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"Regular expression to introduce 'dependencies' section")
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(defconst gyp-sources-regexp
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(regexp-opt (list "action" "files" "include_dirs" "includes" "inputs"
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"libraries" "outputs" "sources"))
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"Regular expression to introduce 'sources' sections")
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(defconst gyp-conditions-regexp
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(regexp-opt (list "conditions" "target_conditions"))
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"Regular expression to introduce conditions sections")
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(defconst gyp-variables-regexp
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"^variables"
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"Regular expression to introduce variables sections")
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(defconst gyp-defines-regexp
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"^defines"
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"Regular expression to introduce 'defines' sections")
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(defconst gyp-targets-regexp
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"^targets"
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"Regular expression to introduce 'targets' sections")
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(defun gyp-section-name (section)
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"Map the sections we are interested in from SECTION to symbol.
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SECTION is a string from the buffer that introduces a section. The result is
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a symbol representing the kind of section.
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This allows us to treat (for the purposes of font-lock) several different
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section names as the same kind of section. For example, a 'sources section
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can be introduced by the 'sources', 'inputs', 'outputs' keyword.
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'other is the default section kind when a more specific match is not made."
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(cond ((string-match-p gyp-dependencies-regexp section) 'dependencies)
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((string-match-p gyp-sources-regexp section) 'sources)
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((string-match-p gyp-variables-regexp section) 'variables)
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((string-match-p gyp-conditions-regexp section) 'conditions)
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((string-match-p gyp-targets-regexp section) 'targets)
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((string-match-p gyp-defines-regexp section) 'defines)
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(t 'other)))
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(defun gyp-invalidate-parse-states-after (target-point)
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"Erase any parse information after target-point."
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(while (> (caar gyp-parse-history) target-point)
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(setq gyp-parse-history (cdr gyp-parse-history))))
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(defun gyp-parse-point ()
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"The point of the last parse state added by gyp-parse-to."
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(caar gyp-parse-history))
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(defun gyp-parse-sections ()
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"A list of section symbols holding at the last parse state point."
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(cdar gyp-parse-history))
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(defun gyp-inside-dictionary-p ()
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"Predicate returning true if the parser is inside a dictionary."
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(not (eq (cadar gyp-parse-history) 'list)))
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(defun gyp-add-parse-history (point sections)
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"Add parse state SECTIONS to the parse history at POINT so that parsing can be
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resumed instantly."
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(while (>= (caar gyp-parse-history) point)
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(setq gyp-parse-history (cdr gyp-parse-history)))
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(setq gyp-parse-history (cons (cons point sections) gyp-parse-history)))
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(defun gyp-parse-to (target-point)
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"Parses from (point) to TARGET-POINT adding the parse state information to
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gyp-parse-state-history. Parsing stops if TARGET-POINT is reached or if a
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string literal has been parsed. Returns nil if no further parsing can be
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done, otherwise returns the position of the start of a parsed string, leaving
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the point at the end of the string."
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(let ((parsing t)
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string-start)
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(while parsing
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(setq string-start nil)
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;; Parse up to a character that starts a sexp, or if the nesting
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;; level decreases.
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(let ((state (parse-partial-sexp (gyp-parse-point)
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target-point
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-1
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t))
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(sections (gyp-parse-sections)))
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(if (= (nth 0 state) -1)
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(setq sections (cdr sections)) ; pop out a level
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(cond ((looking-at-p "['\"]") ; a string
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(setq string-start (point))
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(goto-char (scan-sexps (point) 1))
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(if (gyp-inside-dictionary-p)
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;; Look for sections inside a dictionary
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(let ((section (gyp-section-name
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(buffer-substring-no-properties
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(+ 1 string-start)
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(- (point) 1)))))
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(setq sections (cons section (cdr sections)))))
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;; Stop after the string so it can be fontified.
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(setq target-point (point)))
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((looking-at-p "{")
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;; Inside a dictionary. Increase nesting.
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(forward-char 1)
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(setq sections (cons 'unknown sections)))
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((looking-at-p "\\[")
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;; Inside a list. Increase nesting
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(forward-char 1)
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(setq sections (cons 'list sections)))
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((not (eobp))
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;; other
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(forward-char 1))))
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(gyp-add-parse-history (point) sections)
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(setq parsing (< (point) target-point))))
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string-start))
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(defun gyp-section-at-point ()
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"Transform the last parse state, which is a list of nested sections and return
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the section symbol that should be used to determine font-lock information for
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the string. Can return nil indicating the string should not have any attached
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section."
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(let ((sections (gyp-parse-sections)))
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(cond
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((eq (car sections) 'conditions)
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;; conditions can occur in a variables section, but we still want to
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;; highlight it as a keyword.
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nil)
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((and (eq (car sections) 'list)
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(eq (cadr sections) 'list))
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;; conditions and sources can have items in [[ ]]
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(caddr sections))
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(t (cadr sections)))))
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(defun gyp-section-match (limit)
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"Parse from (point) to LIMIT returning by means of match data what was
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matched. The group of the match indicates what style font-lock should apply.
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See also `gyp-add-font-lock-keywords'."
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(gyp-invalidate-parse-states-after (point))
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(let ((group nil)
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(string-start t))
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(while (and (< (point) limit)
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(not group)
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string-start)
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(setq string-start (gyp-parse-to limit))
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(if string-start
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(setq group (cl-case (gyp-section-at-point)
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('dependencies 1)
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('variables 2)
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('conditions 2)
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('sources 3)
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('defines 4)
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(nil nil)))))
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(if group
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(progn
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;; Set the match data to indicate to the font-lock mechanism the
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;; highlighting to be performed.
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(set-match-data (append (list string-start (point))
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(make-list (* (1- group) 2) nil)
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(list (1+ string-start) (1- (point)))))
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t))))
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;;; Please see http://code.google.com/p/gyp/wiki/GypLanguageSpecification for
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;;; canonical list of keywords.
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(defun gyp-add-font-lock-keywords ()
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"Add gyp-mode keywords to font-lock mechanism."
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;; TODO(jknotten): Move all the keyword highlighting into gyp-section-match
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;; so that we can do the font-locking in a single font-lock pass.
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(font-lock-add-keywords
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nil
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(list
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;; Top-level keywords
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(list (concat "['\"]\\("
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(regexp-opt (list "action" "action_name" "actions" "cflags"
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"cflags_cc" "conditions" "configurations"
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"copies" "defines" "dependencies" "destination"
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"direct_dependent_settings"
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"export_dependent_settings" "extension" "files"
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"include_dirs" "includes" "inputs" "ldflags" "libraries"
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"link_settings" "mac_bundle" "message"
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"msvs_external_rule" "outputs" "product_name"
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"process_outputs_as_sources" "rules" "rule_name"
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"sources" "suppress_wildcard"
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"target_conditions" "target_defaults"
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"target_defines" "target_name" "toolsets"
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"targets" "type" "variables" "xcode_settings"))
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"[!/+=]?\\)") 1 'font-lock-keyword-face t)
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;; Type of target
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(list (concat "['\"]\\("
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(regexp-opt (list "loadable_module" "static_library"
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"shared_library" "executable" "none"))
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"\\)") 1 'font-lock-type-face t)
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(list "\\(?:target\\|action\\)_name['\"]\\s-*:\\s-*['\"]\\([^ '\"]*\\)" 1
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'font-lock-function-name-face t)
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(list 'gyp-section-match
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(list 1 'font-lock-function-name-face t t) ; dependencies
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(list 2 'font-lock-variable-name-face t t) ; variables, conditions
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(list 3 'font-lock-constant-face t t) ; sources
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(list 4 'font-lock-preprocessor-face t t)) ; preprocessor
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;; Variable expansion
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(list "<@?(\\([^\n )]+\\))" 1 'font-lock-variable-name-face t)
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;; Command expansion
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(list "<!@?(\\([^\n )]+\\))" 1 'font-lock-variable-name-face t)
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)))
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(provide 'gyp)
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