elisp/lilypond-font-lock.el

   1 ;;; lilypond-font-lock.el --- syntax coloring for LilyPond mode
   2
   3 ;; Author: 2001-2006: Heikki Junes
   4 ;;  * Emacs-mode: new keywords, reserved words, identifiers, notenames,
   5 ;;    some dynamics and brackets are font-lock-keywords
   6 ;;  * context-dependent syntax-tables
   7 ;; Author: 1997: Han-Wen Nienhuys
   8 ;; Author: 1995-1996 Barry A. Warsaw
   9 ;;         1992-1994 Tim Peters
  10 ;; Created:       Feb 1992
  11 ;; Version:       2.9.29
  12 ;; Last Modified: 11NOV2006
  13 ;; Keywords: lilypond languages music notation
  14
  15 ;; This started out as a cannabalised version of python-mode.el, by hwn
  16 ;; For changes see the LilyPond ChangeLog
  17 ;;
  18
  19 ;; TODO:
  20 ;;   - handle lexer modes (\header, \melodic) etc.
  21
  22 (defconst LilyPond-font-lock-keywords
  23   (let* ((kwregex (mapconcat (lambda (x) (concat "\\" x))  LilyPond-keywords "\\|"))
  24          (iregex (mapconcat (lambda (x) (concat "\\" x))  LilyPond-identifiers "\\|"))
  25          (ncrwregex (mapconcat (lambda (x) (concat "" x))  LilyPond-non-capitalized-reserved-words "\\|"))
  26          (rwregex (mapconcat (lambda (x) (concat "" x))  LilyPond-Capitalized-Reserved-Words "\\|"))
  27          (duration "\\([ \t]*\\(128\\|6?4\\|3?2\\|16?\\|8\\)[.]*\\([ \t]*[*][ \t]*[0-9]+\\(/[1-9][0-9]*\\)?\\)?\\)")
  28          (longduration "\\([ \t]*\\(\\\\\\(longa\\|breve\\|maxima\\)\\)[.]*\\([ \t]*[*][ \t]*[0-9]+\\(/[1-9][0-9]*\\)?\\)?\\)")
  29 )
  30
  31     (list
  32 ;; Fonts in use (from GNU Emacs Lisp Reference Manual, elisp.ps):
  33 ;; font-lock- (c)omment / (s)tring / (k)eyword / (b)uiltin / (f)unction-name /
  34 ;;            (v)ariable-name / (t)ype / co(n)stant / (w)arning -face
  35
  36 ;; The order below is designed so that proofreading would be possible.
  37
  38 ;; Fontify...
  39 ;; ... (f) identifiers and (k) keywords.
  40 ;; ... (n) user defined indetifiers
  41 ;; ... (v) the right and the left side of '='-marks.
  42 ;; ... (v) reserved words, e.g., FiguredBass.
  43 ;; ... (t) notes and rests
  44 ;; "on top", ... (s) lyrics-mode
  45 ;; "on top", ... (w) horizontal grouping
  46 ;; "on top", ... (f) vertical grouping
  47 ;; "on top", ... (b) expressional grouping
  48 ;; "on top", ... (s) (multiline-)scheme; urgh. one should count the slurs
  49 ;; "on top", ... (s) strings
  50 ;; "on top", ... (c) (multiline-)comments
  51
  52 ;; One should note 'font-lock-multiline' has been possible since Emacs 21.1.
  53 ;; See, e.g., text in "http://emacs.kldp.org/emacs-21.1/etc/NEWS".
  54
  55 ;; ... identifiers (defined above, see iregex)
  56       (cons (concat "\\(\\([_^-]?\\(" iregex "\\)\\)+\\)\\($\\|[] \t(~{}>\\\\_()^*-]\\)") '(1 font-lock-function-name-face))
  57
  58 ;; ... keywords (defined above, see kwregex)
  59       (cons (concat "\\(\\([_^-]?\\(" kwregex "\\)\\)+\\)\\($\\|[] \t(~{}>\\\\_()^*-]\\)") '(1 font-lock-keyword-face))
  60
  61 ;; ... user defined identifiers \[a-zA-Z]+
  62       '("\\([_^-]?\\\\\\([a-zA-Z][a-zA-Z]*\\)\\)" 1 font-lock-constant-face)
  63
  64 ;; ... the left side of '=' -mark
  65       '("\\([_a-zA-Z.0-9-]+\\)[ \t]*=[ \t]*" 1 font-lock-variable-name-face)
  66
  67 ;; ... the right side of '=' -mark
  68       '("[ \t]*=[ \t]*\\([_a-zA-Z.0-9-]+\\)" 1 font-lock-variable-name-face)
  69
  70 ;; ... reserved words (defined above, see rwregex)
  71       (cons (concat "\\(" rwregex "\\)") 'font-lock-variable-name-face)
  72
  73 ;; ... note or rest with (an accidental and) a duration, e.g., b,?16.*3/4
  74       (cons (concat "\\(^\\|[ <\{[/~(!)\t\\\|]\\)\\(\\(\\(" ncrwregex "\\)[,']*[?!]?\\|[srR]\\)" duration "?\\)") '(2 font-lock-type-face))
  75
  76 ;; "on top", ... notes and rests with a long duration
  77       (cons (concat "\\(^\\|[ <\{[/~(!)\t\\\|]\\)\\(\\(\\(" ncrwregex "\\)[,']*[?!]?\\|[srR]\\)" longduration "\\)") '(2 font-lock-type-face t))
  78
  79 ;; "on top", ... lyrics-mode: fontify everything between '<'...'>' or '{'...'}'
  80 ;            URGH, does not know anything about inner brackets.
  81 ;            Multiple lines may need refontifying (C-c f).
  82       '("\\(\\\\lyrics[^{<]*\\)\\({[^}]*\\|<[^>]*\\)" 2 font-lock-string-face t)
  83
  84 ;; "on top", ... horizontal grouping, also as postfix syntax '-*':
  85 ;;               - brackets '{[]}'
  86 ;;               - ties '~'
  87 ;;               - ligatures \[, \]
  88       '("\\(-?[][~}{]\\|\\\\[][]\\)" 0 font-lock-reference-face t)
  89
  90 ;; "on top", ... vertical grouping:
  91 ;;               - '<>'-chord brackets with '\\'-voice sep., not marcato '->'
  92 ;;               - '<< a b >>8' -chords
  93       (cons (concat "\\(\\(-.\\)+\\|[^-^_]\\)\\([<>]+\\(" duration "\\|" longduration "\\)?\\|\\\\\\\\\\)") '(3 font-lock-function-name-face t))
  94
  95 ;; "on top", ... expressional grouping, also as postfix syntax '-*':
  96 ;;               - slurs ( ), \( \), [-^_][()]
  97 ;;               - hairpins \<, \>, \!
  98       '("\\(-?\\\\[(<!>)]\\|[-^_]?[()]\\)" 0 font-lock-builtin-face t)
  99
 100 ;; "on top", ... (multiline-)scheme: try find slurs up to 7th
 101       '("[_^-]?#\\(#[ft]\\|-?[0-9.]+\\|\"[^\"]*\"\\|['`]?[a-zA-Z:-]+\\|['`]?([^()]*\\(([^()]*\\(([^()]*\\(([^()]*\\(([^()]*\\(([^()]*\\(([^)]*)[^()]*\\)*)[^()]*\\)*)[^()]*\\)*)[^()]*\\)*)[^()]*\\)*)[^()]*\\)*[^)]*)\\)" 0 font-lock-string-face t)
 102
 103 ;; "on top", ... strings, match also unending strings at eof:
 104 ;;               if '\n' was not found, it must be '$' which is eof (?).
 105       '("\\([_^-]?\"\\([^\"\\\\]\\|\\\\.\\|\\\\\n\\)*\\(\"\\|$\\)\\)" 0 font-lock-string-face t)
 106
 107 ;; "on top", ... (multiline-)comments
 108       '("\\(%\\({[^%]*%\\(}\\|\\([^}][^%]*%\\)+}\\)\\|.*\\)\\)" 0 font-lock-comment-face t)
 109
 110       )
 111     )
 112   "Additional expressions to fontify in LilyPond mode.")
 113
 114 ;; define a mode-specific abbrev table for those who use such things
 115 (defvar LilyPond-mode-abbrev-table nil
 116   "Abbrev table in use in `LilyPond-mode' buffers.")
 117
 118 (define-abbrev-table 'LilyPond-mode-abbrev-table nil)
 119
 120 (defvar LilyPond-mode-syntax-table nil
 121   "Syntax table used in `LilyPond-mode' buffers.")
 122
 123 (defun LilyPond-mode-set-syntax-table (&optional not-punct)
 124   "Change syntax table according to the argument `not-punct' which contains characters which are given a context dependent non-punctuation syntax: parentheses may be set to parenthesis syntax and characters `-', `^' and `_' may be set to escape syntax."
 125   (if (not not-punct) (setq not-punct '()))
 126   (setq LilyPond-mode-syntax-table (make-syntax-table))
 127   (let ((defaults
 128           '(
 129             ;; NOTE: Emacs knows only "13"-style (used), XEmacs knows also "1b3b", etc.
 130             ( ?\% . "< 13" )   ; comment starter, 1st char in block-comments
 131             ( ?\n . ">")       ; newline: comment ender
 132             ( ?\r . ">")       ; formfeed: comment ender
 133             ( ?\\ . "\\" )     ; escape characters (as '\n' in strings)
 134             ( ?\" . "\"" )     ; string quote characters
 135             ;; word constituents (e.g., belonging to a note)
 136             ( ?\' . "w") ( ?\, . "w") ; transposing octaves
 137             ;; punctuation characters (separate symbols from another)
 138             ( ?\$ . "." ) ( ?\& . "." )
 139             ( ?\* . "." ) ( ?\+ . "." ) ( ?\/ . "." )  ( ?\= . "." )
 140             ( ?\| . "." )      ; bar line
 141             )))
 142     ;; all the paren characters are now handled by lily-specific indenting/matching code in lilypond-indent.el
 143     (if (or (memq ?\{ not-punct) (memq ?\} not-punct))
 144         (setq defaults (cons '( ?\{ . "(} 2" ) (cons '( ?\} . "){ 4" ) defaults))) ; begin and end of a block-comment
 145       (setq defaults (cons '( ?\{ . ". 2" ) (cons '( ?\} . ". 4" ) defaults))))    ; begin and end of a block-comment
 146     (if (or (memq ?\[ not-punct) (memq ?\] not-punct))
 147         (setq defaults (cons '( ?\[ . "(]" ) (cons '( ?\] . ")[" ) defaults)))
 148       (setq defaults (cons '( ?\[ . "." ) (cons '( ?\] . "." ) defaults))))
 149     (if (or (memq ?\< not-punct) (memq ?\> not-punct))
 150         (setq defaults (cons '( ?\< . "(>" ) (cons '( ?\> . ")<" ) defaults)))
 151       (setq defaults (cons '( ?\< . "." ) (cons '( ?\> . "." ) defaults))))
 152     (if (or (memq ?\( not-punct) (memq ?\) not-punct))
 153         (setq defaults (cons '( ?\( . "()" ) (cons '( ?\) . ")(" ) defaults)))
 154       (setq defaults (cons '( ?\( . "." ) (cons '( ?\) . "." ) defaults))))
 155     ;; In LilyPond the following chars serve as escape chars, e.g., c^> d-) e_( ,
 156     ;; but they may be set to punctuation chars, since inside strings they should not act as escape chars
 157     (setq defaults (cons (if (memq ?- not-punct) '( ?\- . "\\" ) '( ?\- . "." ) ) defaults))
 158     (setq defaults (cons (if (memq ?^ not-punct) '( ?^ . "\\" ) '( ?^ . "." ) ) defaults))
 159     (setq defaults (cons (if (memq ?\_ not-punct) '( ?\_ . "\\" ) '( ?\_ . "." ) ) defaults))
 160     (mapcar (function
 161              (lambda (x) (modify-syntax-entry
 162                           (car x) (cdr x) LilyPond-mode-syntax-table)))
 163             defaults)
 164     (set-syntax-table LilyPond-mode-syntax-table)))
 165
 166 (defun LilyPond-mode-context-set-syntax-table ()
 167   "Change syntax table according to current context."
 168   (interactive)
 169   ;; default syntax table sets parentheses to punctuation characters
 170   (LilyPond-mode-set-syntax-table)
 171   ;; find current context
 172   (setq context (parse-partial-sexp (point-min) (point)))
 173   (cond ((nth 3 context)) ; inside string
 174         ((nth 4 context)) ; inside a comment
 175         ((eq (char-syntax (or (char-before (point)) 0)) ?\\)) ; found escape-char
 176         ((and (eq (char-syntax (or (char-before (- (point) 1)) 0)) ?\\)
 177               (memq (char-before (point)) '( ?\) ?\] )))) ; found escape-char
 178         ((memq (char-before (point)) '( ?\) ))
 179          (LilyPond-mode-set-syntax-table '( ?\( ?\) )))
 180         ((memq (char-before (point)) '( ?\] ))
 181          (LilyPond-mode-set-syntax-table '( ?\[ ?\] )))
 182         ((memq (char-before (point)) '( ?\> ?\} ))
 183          (LilyPond-mode-set-syntax-table '( ?\< ?\> ?\{ ?\} ?\^ ?\- ?\_ )))
 184         ((memq (char-after (point)) '( ?\( ))
 185          (LilyPond-mode-set-syntax-table '( ?\( ?\) )))
 186         ((memq (char-after (point)) '( ?\[ ))
 187          (LilyPond-mode-set-syntax-table '( ?\[ ?\] )))
 188         ((memq (char-after (point)) '( ?\< ?\{ ))
 189          (LilyPond-mode-set-syntax-table '( ?\< ?\> ?\{ ?\} ?\^ ?\- ?\_ )))
 190         ))