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-- Copyright 2006-2024 Mitchell. See LICENSE.
-- Props LPeg lexer.
local lexer = lexer
local P, S = lpeg.P, lpeg.S
local lex = lexer.new(..., {lex_by_line = true})
-- Identifiers.
lex:add_rule('identifier',
lex:tag(lexer.IDENTIFIER, (lexer.alpha + S('.-_')) * (lexer.alnum + S('.-_')^0)))
-- Colors.
local xdigit = lexer.xdigit
lex:add_rule('color',
lex:tag(lexer.NUMBER, '#' * xdigit * xdigit * xdigit * xdigit * xdigit * xdigit))
-- Comments.
lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol('#')))
-- Equals.
lex:add_rule('equals', lex:tag(lexer.OPERATOR, '='))
-- Strings.
local sq_str = lexer.range("'")
local dq_str = lexer.range('"')
lex:add_rule('string', lex:tag(lexer.STRING, sq_str + dq_str))
-- Variables.
lex:add_rule('variable',
lex:tag(lexer.OPERATOR, '$(') * lex:tag(lexer.VARIABLE, (lexer.nonnewline - lexer.space - ')')^0) *
lex:tag(lexer.OPERATOR, ')'))
lexer.property['scintillua.comment'] = '#'
return lex
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