51 lines
1.9 KiB
Lua
Executable File
51 lines
1.9 KiB
Lua
Executable File
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- JavaScript 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('javascript')
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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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abstract boolean break byte case catch char class const continue debugger
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default delete do double else enum export extends false final finally float
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for function get goto if implements import in instanceof int interface let
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long native new null of package private protected public return set short
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static super switch synchronized this throw throws transient true try typeof
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var void volatile while with yield
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]]))
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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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-- 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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lexer.delimited_range('`')) +
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token(lexer.REGEX, regex_str))
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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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-- Fold points.
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.COMMENT, '/*', '*/')
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lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
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return lex
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