lexers/props.lua

   1 -- Copyright 2006-2015 Mitchell mitchell.att.foicica.com. See LICENSE.
   2 -- Props LPeg lexer.
   3
   4 local l = require('lexer')
   5 local token, word_match = l.token, l.word_match
   6 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   7
   8 local M = {_NAME = 'props'}
   9
  10 -- Whitespace.
  11 local ws = token(l.WHITESPACE, l.space^1)
  12
  13 -- Comments.
  14 local comment = token(l.COMMENT, '#' * l.nonnewline^0)
  15
  16 -- Equals.
  17 local equals = token(l.OPERATOR, '=')
  18
  19 -- Strings.
  20 local sq_str = l.delimited_range("'")
  21 local dq_str = l.delimited_range('"')
  22 local string = token(l.STRING, sq_str + dq_str)
  23
  24 -- Variables.
  25 local variable = token(l.VARIABLE, '$(' * (l.any - ')')^1 * ')')
  26
  27 -- Colors.
  28 local xdigit = l.xdigit
  29 local color = token('color', '#' * xdigit * xdigit * xdigit * xdigit * xdigit *
  30                              xdigit)
  31
  32 M._rules = {
  33   {'whitespace', ws},
  34   {'color', color},
  35   {'comment', comment},
  36   {'equals', equals},
  37   {'string', string},
  38   {'variable', variable},
  39 }
  40
  41 M._tokenstyles = {
  42   color = l.STYLE_NUMBER
  43 }
  44
  45 M._LEXBYLINE = true
  46
  47 return M