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-- Copyright 2006-2024 Mitchell. See LICENSE.
-- Smalltalk LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('smalltalk')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match(
'true false nil self super isNil not Smalltalk Transcript')))
-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match(
'Date Time Boolean True False Character String Array Symbol Integer Object')))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
local sq_str = lexer.range("'")
local word_str = '$' * lexer.word
lex:add_rule('string', token(lexer.STRING, sq_str + word_str))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.range('"', false, false)))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S(':=_<>+-/*!()[]')))
-- Labels.
lex:add_rule('label', token(lexer.LABEL, '#' * lexer.word))
-- Fold points.
lex:add_fold_point(lexer.OPERATOR, '[', ']')
lexer.property['scintillua.comment'] = '"|"'
return lex
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