Enjoy 3.2 release ^_^

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

@@ -0,0 +1,138 @@
+/**
+ * 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.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.Map;
+import com.jfinal.template.TemplateException;
+import com.jfinal.template.expr.Sym;
+import com.jfinal.template.stat.Location;
+import com.jfinal.template.stat.ParseException;
+import com.jfinal.template.stat.Scope;
+
+/**
+ * 自增与自减
+ */
+public class IncDec extends Expr {
+	
+	private Sym op;
+	private String id;
+	private boolean isPost;	// 是否是后缀形式： i++  i--
+	
+	public IncDec(Sym op, boolean isPost, Expr id, Location location) {
+		if (id == null) {
+			throw new ParseException(op.value() + " operator requires target to be operational", location);
+		}
+		if ( !(id instanceof Id) ) {
+			throw new ParseException(op.value() + " operator only supports identifiers", location);
+		}
+		
+		this.op = op;
+		this.id = ((Id)id).getId();
+		this.isPost = isPost;
+		this.location = location;
+	}
+	
+	@SuppressWarnings({"rawtypes", "unchecked"})
+	public Object eval(Scope scope) {
+		Map map = scope.getMapOfValue(id);
+		if (map == null) {
+			if (scope.getCtrl().isNullSafe()) {
+				return null;
+			}
+			throw new TemplateException("The target of " + op.value() + " operator can not be null", location);
+		}
+		Object value = map.get(id);
+		if ( !(value instanceof Number) ) {
+			throw new TemplateException(op.value() + " operator only support int long float double and BigDecimal type", location);
+		}
+		
+		Number newValue;
+		switch (op) {
+		case INC:
+			newValue = inc((Number)value);
+			break ;
+		case DEC:
+			newValue = dec((Number)value);
+			break ;
+		default:
+			throw new TemplateException("Unsupported operator: " + op.value(), location);
+		}
+		map.put(id, newValue);
+		return isPost ? value : newValue;
+	}
+	
+	private Number inc(Number num) {
+		if (num instanceof Integer) {
+			return Integer.valueOf(num.intValue() + 1);
+		}
+		if (num instanceof Long) {
+			return Long.valueOf(num.longValue() + 1L);
+		}
+		if (num instanceof Float) {
+			return Float.valueOf(num.floatValue() + 1F);
+		}
+		if (num instanceof Double) {
+			return Double.valueOf(num.doubleValue() + 1D);
+		}
+		if (num instanceof BigDecimal) {
+			return ((BigDecimal)num).add(BigDecimal.ONE);
+		}
+		if (num instanceof BigInteger) {
+			return ((BigInteger)num).add(BigInteger.ONE);
+		}
+		if (num instanceof Short) {
+			return (short)(((Short)num).shortValue() + 1);
+		}
+		if (num instanceof Byte) {
+			return (byte)(((Byte)num).byteValue() + 1);
+		}
+		return num.intValue() + 1;
+	}
+	
+	private Number dec(Number num) {
+		if (num instanceof Integer) {
+			return Integer.valueOf(num.intValue() - 1);
+		}
+		if (num instanceof Long) {
+			return Long.valueOf(num.longValue() - 1L);
+		}
+		if (num instanceof Float) {
+			return Float.valueOf(num.floatValue() - 1F);
+		}
+		if (num instanceof Double) {
+			return Double.valueOf(num.doubleValue() - 1D);
+		}
+		if (num instanceof BigDecimal) {
+			return ((BigDecimal)num).subtract(BigDecimal.ONE);
+		}
+		if (num instanceof BigInteger) {
+			return ((BigInteger)num).subtract(BigInteger.ONE);
+		}
+		if (num instanceof Short) {
+			return (short)(((Short)num).shortValue() - 1);
+		}
+		if (num instanceof Byte) {
+			return (byte)(((Byte)num).byteValue() - 1);
+		}
+		return num.intValue() - 1;
+	}
+}
+
+
+