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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
-- Ini LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local lex = lexer.new('ini')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
true false on off yes no
]]))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, (lexer.alpha + '_') *
(lexer.alnum + S('_.'))^0))
-- Strings.
lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'") +
lexer.delimited_range('"')))
-- Labels.
lex:add_rule('label', token(lexer.LABEL,
lexer.delimited_range('[]', true, true)))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.starts_line(S(';#')) *
lexer.nonnewline^0))
-- Numbers.
local dec = lexer.digit^1 * ('_' * lexer.digit^1)^0
local oct_num = '0' * S('01234567_')^1
local integer = S('+-')^-1 * (lexer.hex_num + oct_num + dec)
lex:add_rule('number', token(lexer.NUMBER, lexer.float + integer))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, '='))
return lex
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