content: /*
   * Copyright 2024-2025 the original author or authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.cloud.ai.studio.admin.generator.utils;
  
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public class StringTemplateUtil {
  
  	/**
  	 * turn dify string template into spring-ai template
  	 * @param template e.g. "the output is {{#output}}"
  	 * @param variables e.g. {{#output#}} -> context
  	 * @return spring-ai template e.g. {output}
  	 */
  	public static String fromDifyTmpl(String template, List<String> variables) {
  		String regex = "\\{\\{#(.*?)#\\}\\}";
  		Pattern pattern = Pattern.compile(regex);
  		Matcher matcher = pattern.matcher(template);
  		StringBuilder result = new StringBuilder();
  		while (matcher.find()) {
  			String variable = matcher.group(1);
  			variables.add(variable);
  			matcher.appendReplacement(result, "{" + variable + "}");
  		}
  		matcher.appendTail(result);
  		return result.toString();
  	}
  
  	/**
  	 * turn spring-ai template into dify string template
  	 * @param template e.g. "the output is {output}"
  	 * @return dify template e.g. "the output is {{#output#}}"
  	 */
  	public static String toDifyTmpl(String template) {
  		String regex = "\\{(.*?)}";
  		return template.replaceAll(regex, "{{#$1#}}");
  	}
  
  }
  