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-- Copyright 2006-2017 Robert Gieseke. See LICENSE.
-- Lilypond LPeg lexer.
-- TODO Embed Scheme; Notes?, Numbers?
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'lilypond'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '%' * l.nonnewline^0
-- TODO: block comment.
local comment = token(l.COMMENT, line_comment)
-- Strings.
local string = token(l.STRING, l.delimited_range('"', false, true))
-- Keywords, commands.
local keyword = token(l.KEYWORD, '\\' * l.word)
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S("{}'~<>|"))
M._rules = {
{'whitespace', ws},
{'comment', comment},
{'string', string},
{'keyword', keyword},
{'operator', operator},
{'identifier', identifier},
}
return M
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