jfinal 3.6

src/main/java/com/jfinal/template/ext/directive/CallDirective.java

@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
+ *
+ * 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.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
+ * 
+ * 注意：该指令并非默认指令，需要使用 Engine.addDirective("call", CallDirective.class)
+ *      配置后才可以使用
+ * 
+ * TODO 后续优化看一下 ast.Call.java
+ */
+public class CallDirective extends Directive {
+	
+	protected Expr funcNameExpr;
+	protected ExprList paraExpr;
+	
+	public void setExprList(ExprList exprList) {
+		if (exprList.length() == 0) {
+			throw new ParseException("模板函数名不能缺失", location);
+		}
+		
+		this.funcNameExpr = exprList.getExpr(0);
+		
+		ArrayList<Expr> list = new ArrayList<Expr>();
+		for (int i=1; i<exprList.length(); i++) {
+			list.add(exprList.getExpr(i));
+		}
+		this.paraExpr = new ExprList(list);
+	}
+	
+	public void exec(Env env, Scope scope, Writer writer) {
+		Object funcNameValue = funcNameExpr.eval(scope);
+		if (!(funcNameValue instanceof String)) {
+			throw new ParseException("模板函数名必须是字符串", location);
+		}
+		
+		Define func = env.getFunction(funcNameValue.toString());
+		func.call(env, scope, paraExpr, writer);
+	}
+}
+
+
+
+