Method make_if_ast_node

src/Chain/libraries/glua/lparsercombinator.cpp:1187–1220

TODO: 把手动解构做成自动解构,或者根据原始语法自动生成类 if exp then block { elseif exp then block } [ else block ] end */

			end
		 */
		MatchResult *ParserContext::make_if_ast_node(ParserFunctor *pf, MatchResult *mr)
        {
			std::vector<GluaConditionNodeInfo> condition_node_infos;
			MatchResult *else_block_mr = nullptr;
			assert(mr->is_complex());
			auto cmr = mr->as_complex();
			assert(cmr->size() >= 5);
			condition_node_infos.push_back(std::make_pair(cmr->get_item(1), cmr->get_item(3)));
			for(size_t cur_pos=4;cur_pos<cmr->size()-1;++cur_pos)
			{
				MatchResult *cur_mr = cmr->get_item(cur_pos);
				auto head_token = cur_mr->head_token().token;
				if(head_token == "elseif")
				{
					assert(cur_mr->is_complex() && cur_mr->as_complex()->size()>=4);
					auto cur_cmr = cur_mr->as_complex();
					condition_node_infos.push_back(std::make_pair(cur_cmr->get_item(1), cur_cmr->get_item(3)));
				}
				else if(head_token == "else")
				{
					else_block_mr = cmr->get_item(cur_pos+1);
					break;
				}
				else
				{
					// end
					break;
				}
			}
			auto *node = new GluaIfStatNode(mr, condition_node_infos, else_block_mr);
			node->set_node_name("if_stat");
			add_match_result(node);
			return node;
        }

        ParserFunctor *ParserContext::generate_glua_parser()
        {