44 lines
1.3 KiB
Lua
44 lines
1.3 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Ini 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('ini')
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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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true false on off yes no
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, (lexer.alpha + '_') *
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(lexer.alnum + S('_.'))^0))
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-- Strings.
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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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-- Labels.
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lex:add_rule('label', token(lexer.LABEL,
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lexer.delimited_range('[]', true, true)))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, lexer.starts_line(S(';#')) *
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lexer.nonnewline^0))
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-- Numbers.
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local dec = lexer.digit^1 * ('_' * lexer.digit^1)^0
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local oct_num = '0' * S('01234567_')^1
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local integer = S('+-')^-1 * (lexer.hex_num + oct_num + dec)
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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, '='))
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return lex
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