lexers/lilypond.lua

   1 -- Copyright 2006-2013 Robert Gieseke. See LICENSE.
   2 -- Lilypond LPeg lexer.
   3 -- TODO Embed Scheme; Notes?, Numbers?
   4
   5 local l = require('lexer')
   6 local token, word_match = l.token, l.word_match
   7 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   8
   9 local M = {_NAME = 'lilypond'}
  10
  11 -- Whitespace.
  12 local ws = token(l.WHITESPACE, l.space^1)
  13
  14 -- Comments.
  15 local line_comment = '%' * l.nonnewline^0
  16 -- TODO: block comment.
  17 local comment = token(l.COMMENT, line_comment)
  18
  19 -- Strings.
  20 local string = token(l.STRING, l.delimited_range('"', false, true))
  21
  22 -- Keywords, commands.
  23 local keyword = token(l.KEYWORD, '\\' * l.word)
  24
  25 -- Identifiers.
  26 local identifier = token(l.IDENTIFIER, l.word)
  27
  28 -- Operators.
  29 local operator = token(l.OPERATOR, S("{}'~<>|"))
  30
  31 M._rules = {
  32   {'whitespace', ws},
  33   {'comment', comment},
  34   {'string', string},
  35   {'keyword', keyword},
  36   {'operator', operator},
  37   {'identifier', identifier},
  38 }
  39
  40 return M