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scala-mode-fontlock.el
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scala-mode-fontlock.el
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;;; -*-Emacs-Lisp-*-
;;; scala-mode-fontlock.el -
;; Copyright (C) 2009 Scala Dev Team at EPFL
;; Authors: See AUTHORS file
;; Keywords: scala languages oop
;; $Id: scala-mode-fontlock.el 17069 2009-02-10 08:30:51Z nielsen $
;;; License
;; SCALA LICENSE
;;
;; Copyright (c) 2002-2009 EPFL, Lausanne, unless otherwise specified.
;; All rights reserved.
;;
;; This software was developed by the Programming Methods Laboratory of the
;; Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland.
;;
;; Permission to use, copy, modify, and distribute this software in source
;; or binary form for any purpose with or without fee is hereby granted,
;; provided that the following conditions are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;;
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;;
;; 3. Neither the name of the EPFL nor the names of its contributors
;; may be used to endorse or promote products derived from this
;; software without specific prior written permission.
;;
;;
;; THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;; ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
;; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
;; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
;; SUCH DAMAGE.
;;; Code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(provide 'scala-mode-fontlock)
(require 'cl)
(require 'font-lock)
(require 'scala-mode-constants)
(require 'scala-mode-lib)
(require 'scala-mode-navigation)
(defun scala-mark-borders (funs)
(loop for (fun . flag) in funs
if flag collect (point-marker)
while (funcall fun)
if flag collect (point-marker)))
(defun scala-make-match (funs)
(let ((start-mark (point-marker))
(markers (scala-mark-borders funs))
(end-mark (point-marker)))
(cons start-mark (cons end-mark markers))))
(defconst scala-binding-end-re
(regexp-opt '(":" "=" "=>" ";" "<-")))
(defun scala-match-and-skip-binding (limit)
(skip-chars-forward " ()")
(and (not (or (looking-at "\\<\\(extends\\|with\\)\\>\\|{")
(scala-looking-at-special-identifier scala-binding-end-re)))
(ignore-errors
(save-restriction
(narrow-to-region (point-min) limit)
(let ((matches (scala-make-match
'((scala-forward-ident . t)
((lambda ()
(scala-forward-spaces)
(when (scala-looking-at-special-identifier ":")
(forward-char)
(scala-forward-spaces)
t)) . nil)
((lambda ()
(scala-forward-type)
(scala-when-looking-at "\\s *\\*")
t) . t)))))
(scala-when-looking-at "\\s *,")
(set-match-data matches)))
t)))
(defun scala-match-and-skip-ident (limit)
(scala-forward-spaces)
(when (and (not (looking-at scala-keywords-re))
(looking-at scala-qual-ident-re))
(goto-char (match-end 0))
t))
(defun scala-match-and-skip-type-param (limit)
(scala-when-looking-at "\\s *[[,]\\s *"
(let ((matches (scala-make-match '((scala-forward-type-param . t)))))
(scala-when-looking-at "\\s *\\]")
(set-match-data matches)
t)))
(defun scala-match-and-skip-result-type (limit)
(scala-when-looking-at "\\s *:\\s *"
(set-match-data (list (point-marker)
(progn (scala-forward-type) (point-marker))))
t))
(defconst scala-pattern-end-re
(regexp-opt '("if" "case" "class") 'words))
(defconst scala-pattern-end-special-re
(regexp-opt '( "=>" "=" "<-") t))
(defun scala-match-and-skip-pattern (limit)
(while (progn
(skip-chars-forward "()[], ")
(and (not (or (looking-at scala-pattern-end-re)
(scala-looking-at-special-identifier
scala-pattern-end-special-re)))
(looking-at scala-literal-re)))
(goto-char (match-end 0)))
(and (not (or (looking-at scala-pattern-end-re)
(scala-looking-at-special-identifier scala-pattern-end-special-re)))
(let ((case-fold-search nil))
(cond ((looking-at scala-capitalized-ident-re)
(goto-char (match-end 0)))
((scala-match-and-skip-binding limit) t)))))
(defvar scala-font-lock-keywords
`(;; keywords
(,scala-keywords-re 0 font-lock-keyword-face nil)
;; constants
(,scala-constants-re
0 ,(if (boundp 'font-lock-constant-face)
'font-lock-constant-face
'font-lock-keyword-face)
nil)
;; modules
(,(concat "\\<\\(module\\|object\\)\\>\\s *\\(" scala-ident-re "\\)")
(2 font-lock-variable-name-face nil))
;; type definitions
(,(concat "\\<type\\>\\s *\\(" scala-ident-re "\\)")
(1 font-lock-type-face nil))
;; variables
("\\<var\\>"
(scala-match-and-skip-binding (goto-char (match-end 0))
nil
(1 font-lock-variable-name-face nil)
(2 font-lock-type-face nil t)))
;; functions
(,(concat "\\(^\\|[^(,]\\)\\s *\\<def\\>"
"\\s *"
"\\("
scala-ident-re
"\\)\\s *")
(2 font-lock-function-name-face nil)
(scala-match-and-skip-type-param (goto-char (match-end 0)) nil
(1 font-lock-type-face nil t))
(scala-match-and-skip-binding nil nil
(1 font-lock-variable-name-face nil)
(2 font-lock-type-face nil t))
(scala-match-and-skip-result-type nil nil
(0 font-lock-type-face nil)))
;; class definitions
("\\<\\(class\\|trait\\)\\>"
(scala-match-and-skip-ident (goto-char (match-end 0)) nil
(1 font-lock-type-face nil))
(scala-match-and-skip-type-param nil nil
(1 font-lock-type-face nil t))
(scala-match-and-skip-binding nil nil
(1 font-lock-variable-name-face nil)
(2 font-lock-type-face nil t)))
;; "extends" and "with" clauses
("\\<\\(extends\\|with\\)\\>\\s *[^{]"
(scala-match-and-skip-ident (goto-char (1- (match-end 0))) nil
(0 font-lock-type-face nil))
(scala-match-and-skip-type-param nil nil
(1 font-lock-type-face nil t)))
;; patterns
("\\<\\(case\\|val\\)\\>\\s *"
(scala-match-and-skip-pattern (goto-char (match-end 0)) nil
(1 font-lock-variable-name-face nil)
(2 font-lock-type-face nil t)))
))
(defvar scala-font-lock-syntactic-keywords
`((,scala-char-re (0 "\"" t nil))
(scala-search-special-identifier-forward (0 "w" nil nil))))