-- Copyright 2010-2018 Martin Morawetz. See License.txt.
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-- ChucK LPeg lexer.
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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('chuck')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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-- Control structures.
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break continue else for if repeat return switch until while
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-- Other chuck keywords.
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function fun spork const new
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]]))
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-- Constants.
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lex:add_rule('constant', token(lexer.CONSTANT, word_match[[
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-- Special values.
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false maybe me null NULL pi true
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]]))
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-- Types.
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lex:add_rule('type', token(lexer.TYPE, word_match[[
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float int time dur void same
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]]))
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-- Classes.
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lex:add_rule('class', token(lexer.CLASS, word_match[[
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-- Class keywords.
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class extends implements interface private protected public pure static super
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this
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]]))
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-- Global ugens.
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lex:add_rule('ugen', token('ugen', word_match[[dac adc blackhole]]))
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lex:add_style('ugen', lexer.STYLE_CONSTANT)
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-- Times.
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lex:add_rule('time', token('time', word_match[[
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samp ms second minute hour day week
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]]))
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lex:add_style('time', lexer.STYLE_NUMBER)
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-- Special special value.
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lex:add_rule('now', token('now', P('now')))
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lex:add_style('now', lexer.STYLE_CONSTANT..',bold')
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-- Strings.
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local sq_str = P('L')^-1 * lexer.delimited_range("'", true)
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local dq_str = P('L')^-1 * lexer.delimited_range('"', true)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Comments.
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local line_comment = '//' * lexer.nonnewline_esc^0
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local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
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lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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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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