32 lines
860 B
Lua
32 lines
860 B
Lua
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-- Copyright 2006-2019 Robert Gieseke. See License.txt.
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-- Lilypond LPeg lexer.
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-- TODO Embed Scheme; Notes?, Numbers?
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('lilypond')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords, commands.
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lex:add_rule('keyword', token(lexer.KEYWORD, '\\' * lexer.word))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING,
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lexer.delimited_range('"', false, true)))
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-- Comments.
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-- TODO: block comment.
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lex:add_rule('comment', token(lexer.COMMENT, '%' * lexer.nonnewline^0))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S("{}'~<>|")))
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return lex
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