-- Copyright 2006-2025 Mitchell. See LICENSE.
-- Ini LPeg lexer.

local lexer = lexer
local S = lpeg.S

local lex = lexer.new(...)

-- Keywords.
lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lex:word_match(lexer.KEYWORD)))

-- Identifiers.
lex:add_rule('identifier',
	lex:tag(lexer.IDENTIFIER, (lexer.alpha + '_') * (lexer.alnum + S('_. '))^0))

-- Strings.
local sq_str = lexer.range("'")
local dq_str = lexer.range('"')
lex:add_rule('string', lex:tag(lexer.STRING, sq_str + dq_str))

-- Section labels/headers.
lex:add_rule('label', lex:tag(lexer.LABEL, lexer.range('[', ']', true)))

-- Comments.
lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol(lexer.starts_line(S(';#')))))

-- Numbers.
lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.float + lexer.integer))

-- Operators.
lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('=:')))

-- Word lists
lex:set_word_list(lexer.KEYWORD, 'true false on off yes no')

lexer.property['scintillua.comment'] = '#'

return lex