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-- Copyright 2022-2025 Mitchell. See LICENSE.
-- ? LPeg lexer.
local lexer = lexer
local P, S = lpeg.P, 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.word))
-- Strings.
local sq_str = lexer.range("'")
local dq_str = lexer.range('"')
lex:add_rule('string', lex:tag(lexer.STRING, sq_str + dq_str))
-- Comments.
lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol('#')))
-- Numbers.
lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
-- Operators.
lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('+-*/%^=<>,.{}[]()')))
-- Fold points.
lex:add_fold_point(lexer.KEYWORD, 'start', 'end')
lex:add_fold_point(lexer.OPERATOR, '{', '}')
-- Word lists.
lex:set_word_list(lexer.KEYWORD, {
'keyword1', 'keyword2', 'keyword3'
})
lexer.property['scintillua.comment'] = '#'
return lex
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