40 lines
1.3 KiB
Lua
40 lines
1.3 KiB
Lua
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-- Copyright 2006-2019 Brian "Sir Alaran" Schott. See License.txt.
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-- JSON LPeg lexer.
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-- Based off of lexer code by Mitchell.
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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('json')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true) +
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lexer.delimited_range('"', true)))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[true false null]]))
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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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local integer = S('+-')^-1 * lexer.digit^1 * S('Ll')^-1
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + 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.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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