60 lines
1.9 KiB
Java
60 lines
1.9 KiB
Java
/**
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* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jfinal.template.stat.ast;
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import com.jfinal.template.Env;
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import com.jfinal.template.expr.ast.Assign;
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import com.jfinal.template.expr.ast.Expr;
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import com.jfinal.template.expr.ast.ExprList;
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import com.jfinal.template.io.Writer;
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import com.jfinal.template.stat.Location;
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import com.jfinal.template.stat.ParseException;
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import com.jfinal.template.stat.Scope;
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/**
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* Set 赋值，从内向外作用域查找变量，找到则替换变量值，否则在顶层作用域赋值
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*
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* 用法：
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* 1：#set(k = v)
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* 2：#set(k1 = v1, k2 = v2, ..., kn = vn)
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* 3：#set(x = 1+2)
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* 4：#set(x = 1+2, y = 3>4, ..., z = c ? a : b)
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*/
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public class Set extends Stat {
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private Expr expr;
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public Set(ExprList exprList, Location location) {
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if (exprList.length() == 0) {
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throw new ParseException("The parameter of #set directive can not be blank", location);
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}
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for (Expr expr : exprList.getExprArray()) {
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if ( !(expr instanceof Assign) ) {
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throw new ParseException("#set directive only supports assignment expressions", location);
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}
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}
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this.expr = exprList.getActualExpr();
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}
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public void exec(Env env, Scope scope, Writer writer) {
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scope.getCtrl().setWisdomAssignment();
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expr.eval(scope);
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}
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}
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