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/**
 * Copyright (c) 2011-2023, James Zhan 詹波 ([email protected]).
 *
 * 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
 *
 *      http://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.jfinal.template.ext.directive;

import java.util.ArrayList;
import com.jfinal.template.Directive;
import com.jfinal.template.Env;
import com.jfinal.template.TemplateException;
import com.jfinal.template.expr.ast.Const;
import com.jfinal.template.expr.ast.Expr;
import com.jfinal.template.expr.ast.ExprList;
import com.jfinal.template.io.Writer;
import com.jfinal.template.stat.ParseException;
import com.jfinal.template.stat.Scope;
import com.jfinal.template.stat.ast.Define;

/**
 * CallDirective 动态调用模板函数
 * 
 * 模板函数的名称与参数都可以动态指定，提升模板函数调用的灵活性
 * 
 * 例如：
 *     #call(funcName, p1, p2, ..., pn)
 *     其中 funcName，为函数名，p1、p2、pn 为被调用函数所使用的参数
 * 
 * 
 * 如果希望模板函数不存在时忽略其调用，添加常量值 true 在第一个参数位置即可
 * 例如：
 *     #call(true, funcName, p1, p2, ..., pn)
 * 
 * 
 * TODO 后续优化看一下 ast.Call.java
 */
public class CallDirective extends Directive {
	
	protected Expr funcNameExpr;
	protected ExprList paraExpr;
	
	protected boolean nullSafe = false;		// 是否支持函数名不存在时跳过
	
	public void setExprList(ExprList exprList) {
		int len = exprList.length();
		if (len == 0) {
			throw new ParseException("Template function name required", location);
		}
		
		int index = 0;
		Expr expr = exprList.getExpr(index);
		if (expr instanceof Const && ((Const)expr).isBoolean()) {
			if (len == 1) {
				throw new ParseException("Template function name required", location);
			}
			
			nullSafe = ((Const)expr).getBoolean();
			index++;
		}
		
		funcNameExpr = exprList.getExpr(index++);
		
		ArrayList list = new ArrayList();
		for (int i=index; i