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-- Copyright 2010-2017 Martin Morawetz. See LICENSE.
-- ChucK LPeg lexer.
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 = 'chuck'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '//' * l.nonnewline_esc^0
local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
local comment = token(l.COMMENT, line_comment + block_comment)
-- Strings.
local sq_str = P('L')^-1 * l.delimited_range("'", true)
local dq_str = P('L')^-1 * l.delimited_range('"', true)
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Constants.
local constant = token(l.CONSTANT, word_match{
-- special values
'false', 'maybe', 'me', 'null', 'NULL', 'pi', 'true'
})
-- Special special value.
local now = token('now', P('now'))
-- Times.
local time = token('time', word_match{
'samp', 'ms', 'second', 'minute', 'hour', 'day', 'week'
})
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
-- Control structures.
'break', 'continue', 'else', 'for', 'if', 'repeat', 'return', 'switch',
'until', 'while',
-- Other chuck keywords.
'function', 'fun', 'spork', 'const', 'new'
})
-- Classes.
local class = token(l.CLASS, word_match{
-- Class keywords.
'class', 'extends', 'implements', 'interface', 'private', 'protected',
'public', 'pure', 'super', 'static', 'this'
})
-- Types.
local types = token(l.TYPE, word_match{
'float', 'int', 'time', 'dur', 'void', 'same'
})
-- Global ugens.
local ugen = token('ugen', word_match{'dac', 'adc', 'blackhole'})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}@'))
M._rules = {
{'whitespace', ws},
{'string', string},
{'keyword', keyword},
{'constant', constant},
{'type', types},
{'class', class},
{'ugen', ugen},
{'time', time},
{'now', now},
{'identifier', identifier},
{'comment', comment},
{'number', number},
{'operator', operator},
}
M._tokenstyles = {
ugen = l.STYLE_CONSTANT,
time = l.STYLE_NUMBER,
now = l.STYLE_CONSTANT..',bold'
}
return M
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