47 lines
1.7 KiB
Lua
47 lines
1.7 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- CoffeeScript 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, S = lpeg.P, lpeg.S
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local lex = lexer.new('coffeescript', {fold_by_indentation = true})
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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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all and bind break by case catch class const continue default delete do each
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else enum export extends false finally for function if import in instanceof is
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isnt let loop native new no not of off on or return super switch then this
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throw true try typeof unless until var void when while with yes
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]]))
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-- Fields: object properties and methods.
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lex:add_rule('field', token(lexer.FUNCTION, '.' * (S('_$') + lexer.alpha) *
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(S('_$') + lexer.alnum)^0))
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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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local regex_str = #P('/') * lexer.last_char_includes('+-*%<>!=^&|?~:;,([{') *
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lexer.delimited_range('/', true) * S('igm')^0
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lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'") +
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lexer.delimited_range('"')) +
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token(lexer.REGEX, regex_str))
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-- Comments.
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local block_comment = '###' * (lexer.any - '###')^0 * P('###')^-1
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local line_comment = '#' * lexer.nonnewline_esc^0
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lex:add_rule('comment', token(lexer.COMMENT, block_comment + line_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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