Enjoy 3.2 release ^_^

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

@@ -0,0 +1,86 @@
+/**
+ * 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 com.jfinal.template.TemplateException;
+import com.jfinal.template.stat.Location;
+import com.jfinal.template.stat.ParseException;
+import com.jfinal.template.stat.Scope;
+
+/**
+ * index : expr '[' expr ']'
+ * 
+ * 支持 a[i]、 a[b[i]]、a[i][j]、a[i][j]...[n]
+ */
+public class Index extends Expr {
+	
+	private Expr expr;
+	private Expr index;
+	
+	public Index(Expr expr, Expr index, Location location) {
+		if (expr == null || index == null) {
+			throw new ParseException("array/list/map and their index can not be null", location);
+		}
+		this.expr = expr;
+		this.index = index;
+		this.location = location;
+	}
+	
+	@SuppressWarnings("rawtypes")
+	public Object eval(Scope scope) {
+		Object array = expr.eval(scope);
+		if (array == null) {
+			if (scope.getCtrl().isNullSafe()) {
+				return null;
+			}
+			throw new TemplateException("The index access operation target can not be null", location);
+		}
+		
+		Object idx = index.eval(scope);
+		if (idx == null) {
+			if (scope.getCtrl().isNullSafe()) {
+				return null;
+			}
+			throw new TemplateException("The index of list/array and the key of map can not be null", location);
+		}
+		
+		if (array instanceof List) {
+			if (idx instanceof Integer) {
+				return ((List<?>)array).get((Integer)idx);
+			}
+			throw new TemplateException("The index of list can only be integer", location);
+		}
+		
+		if (array instanceof java.util.Map) {
+			return ((java.util.Map)array).get(idx);
+		}
+		
+		if (array.getClass().isArray()) {
+			if (idx instanceof Integer) {
+				return java.lang.reflect.Array.get(array, (Integer)idx);
+			}
+			throw new TemplateException("The index of array can only be integer", location);
+		}
+		
+		throw new TemplateException("Only the list array and map is supported by index access", location);
+	}
+}
+
+
+
+