Enjoy 3.2 release ^_^

src/main/java/com/jfinal/template/expr/ast/Assign.java

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+/**
+ * Copyright (c) 2011-2017, 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.expr.ast;
+
+import java.util.List;
+import java.util.Map;
+import com.jfinal.template.TemplateException;
+import com.jfinal.template.stat.Location;
+import com.jfinal.template.stat.ParseException;
+import com.jfinal.template.stat.Scope;
+
+/**
+ * Assign
+ * 
+ * 支持三种赋值，其中第二种如果括号中是 ID 或 STR 则演变为第三种是对 map 赋值：
+ * 1：ID = expr
+ * 2：ID [ expr ] = expr
+ *   如果 expr 为 int 或 long 型，则是对 array 赋值
+ *   如果 expr 为 ID、STR 型，则是对 map 进行赋值
+ *   否则抛异常出来
+ * 3：ID [ ID ] = expr 或者 ID [ STR ] = expr
+ * 4：支持无限连：id = array[ i = 0 ] = array[1] = 123
+ */
+public class Assign extends Expr {
+	
+	private String id;
+	private Expr index;	// index 用于支持 ID [ expr ] = expr 这种形式
+	private Expr right;
+	
+	/**
+	 * 数组赋值表达式
+	 */
+	public Assign(String id, Expr index, Expr right, Location location) {
+		if (index == null) {
+			throw new ParseException("The index expression of array assignment can not be null", location);
+		}
+		if (right == null) {
+			throw new ParseException("The expression on the right side of an assignment expression can not be null", location);
+		}
+		this.id = id;
+		this.index = index;
+		this.right = right;
+		this.location = location;
+	}
+	
+	/**
+	 * 普通赋值表达式
+	 */
+	public Assign(String id, Expr right, Location location) {
+		if (right == null) {
+			throw new ParseException("The expression on the right side of an assignment expression can not be null", location);
+		}
+		this.id = id;
+		this.index = null;
+		this.right = right;
+		this.location = location;
+	}
+	
+	/**
+	 * 赋值语句有返回值，可以用于表达式计算
+	 */
+	public Object eval(Scope scope) {
+		if (index == null) {
+			return assignVariable(scope);
+		} else {
+			return assignElement(scope);
+		}
+	}
+	
+	Object assignVariable(Scope scope) {
+		Object rightValue = right.eval(scope);
+		if (scope.getCtrl().isWisdomAssignment()) {
+			scope.set(id, rightValue);
+		} else if (scope.getCtrl().isLocalAssignment()) {
+			scope.setLocal(id, rightValue);
+		} else {
+			scope.setGlobal(id, rightValue);
+		}
+		
+		return rightValue;
+	}
+	
+	/**
+	 * 数组或 Map 赋值
+	 */
+	@SuppressWarnings({"unchecked", "rawtypes"})
+	Object assignElement(Scope scope) {
+		Object target = scope.get(id);
+		if (target == null) {
+			throw new TemplateException("The assigned targets \"" + id + "\" can not be null", location);
+		}
+		Object idx = index.eval(scope);
+		if (idx == null) {
+			throw new TemplateException("The index of list/array and the key of map can not be null", location);
+		}
+		
+		Object value;
+		if (target instanceof Map) {
+			value = right.eval(scope);
+			((Map)target).put(idx, value);
+			return value;
+		}
+		
+		if ( !(idx instanceof Integer) ) {
+			throw new TemplateException("The index of list/array can only be integer", location);
+		}
+		
+		if (target instanceof List) {
+			value = right.eval(scope);
+			((List)target).set((Integer)idx, value);
+			return value;
+		}
+		if (target.getClass().isArray()) {
+			value = right.eval(scope);
+			java.lang.reflect.Array.set(target, (Integer)idx, value);
+			return value;
+		}
+		
+		throw new TemplateException("Only the list array and map is supported by index assignment", location);
+	}
+}
+
+
+
+
+
+
+