#include "ast_gen.h"

using namespace ast_gen;
using namespace ast_basic;
using namespace lib_token;
using namespace lib_syntax;
using namespace lib_words;

SyntaxParser::SyntaxParser(std::shared_ptr<const IBasicRule> rule)
	: _rule_bind(rule) { }

QList<std::shared_ptr<const MatchCursor>> SyntaxParser::parse(std::shared_ptr<const IPrimitiveWord> words) {
	auto cursor = std::make_shared<MatchCursor>(words->file());
	cursor->setCurrent(nullptr, words);

	auto list = this->_rule_bind->parse(cursor);
	std::sort(list.begin(), list.end(),
		[&](std::shared_ptr<const MatchCursor> a, std::shared_ptr<const MatchCursor> b) {
		return a->totalErrorCount() < b->totalErrorCount();
	});

	return list;
}

#include "tokens_impl.h"
std::shared_ptr<IExprInstance> ast_gen::SyntaxParser::getAst(
	std::shared_ptr<const lib_syntax::MatchCursor> cursor, std::shared_ptr<IExprInstance> root) {

	QList<std::shared_ptr<const IActionToken>> token_seqs;
	std::shared_ptr<const IActionToken> action_token = cursor->currentToken();
	while (action_token) {
		token_seqs.prepend(action_token);
		action_token = action_token->prevToken();
	}

	auto expr_inst = root;
	for (auto ins_t : token_seqs) {
		expr_inst = std::const_pointer_cast<IActionToken>(ins_t)->makeSure(expr_inst);
	}

	return expr_inst;
}