com.jfinal.template.stat.ast.Define Maven / Gradle / Ivy

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Enjoy is a simple, light, rapid, independent, extensible Java Template Engine.
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/**
 * Copyright (c) 2011-2019, 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.stat.ast;

import com.jfinal.template.Env;
import com.jfinal.template.TemplateException;
import com.jfinal.template.stat.Location;
import com.jfinal.template.stat.ParseException;
import com.jfinal.template.stat.Scope;
import com.jfinal.template.expr.ast.Expr;
import com.jfinal.template.expr.ast.ExprList;
import com.jfinal.template.expr.ast.Id;
import com.jfinal.template.io.Writer;

/**
 * Define 定义模板函数：
 * #define funcName(p1, p2, ..., pn)
 *   body
 * #end
 * 
 * 模板函数类型：
 * 1：全局共享的模板函数
 *   通过 engine.addSharedFunction(...) 添加，所有模板中可调用
 * 2：模板中定义的局部模板函数
 *   在模板中定义的模板函数，只在本模板中有效
 * 
 * 高级用法：
 * 1：局部模板函数可以与全局共享模板函数同名，调用时优先调用模板内模板数
 * 2：模板内部不能定义同名的局部模板函数
 */
public class Define extends Stat {
	
	private static final String[] NULL_PARAMETER_NAMES = new String[0];
	
	private String functionName;
	private String[] parameterNames;
	private Stat stat;
	
	public Define(String functionName, ExprList exprList, StatList statList, Location location) {
		setLocation(location);
		this.functionName = functionName;
		this.stat = statList.getActualStat();
		
		Expr[] exprArray = exprList.getExprArray();
		if (exprArray.length == 0) {
			this.parameterNames = NULL_PARAMETER_NAMES;
			return ;
		}
		
		parameterNames = new String[exprArray.length];
		for (int i=0; i 0) {
			Object[] parameterValues = exprList.evalExprList(scope);
			for (int i=0; i 0) {
				ret.append(", ");
			}
			ret.append(parameterNames[i]);
		}
		return ret.append(")").toString();
	}
	
	// -----------------------------------------------------------------------
	/**
	 * envForDevMode 属性性以及相关方法仅用于 devMode 判断当前 #define 指令所在资源是否被修改
	 * 仅用于 EngineConfig 中处理 shared function 的逻辑
	 */
	private Env envForDevMode;
	
	public void setEnvForDevMode(Env envForDevMode) {
		this.envForDevMode = envForDevMode;
	}
	
	public boolean isSourceModifiedForDevMode() {
		if (envForDevMode == null) {
			throw new IllegalStateException("Check engine config: setDevMode(...) must be invoked before addSharedFunction(...)");
		}
		return envForDevMode.isSourceListModified();
	}
}