enjoy 3.3 release ^_^

src/main/java/com/jfinal/template/ext/directive/NumberDirective.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.ext.directive;
+
+import java.text.DecimalFormat;
+import com.jfinal.template.Directive;
+import com.jfinal.template.Env;
+import com.jfinal.template.TemplateException;
+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;
+
+/**
+ * #number 数字格式化输出指令
+ * 
+ * 两种用法：
+ * 1：#number(n) 用默认 pattern 输出变量中的值
+ * 2：#number(n, "#.##") 用第二个参数指定的 pattern 输出变量中的值
+ * 
+ * 注意：
+ * 1：pattern 的使用与 java.text.DecimalFormat 的完全一样
+ *    在拿不定主意的时候可以在搜索引擎中搜索关键字：DecimalFormat
+ * 2：#number 指令中的参数可以是变量，例如：#number(n, p) 中的 n 与 p 可以全都是变量
+ * 
+ * <pre>
+ * 示例：
+ * #number(3.1415926, "#.##")
+ * #number(0.9518, "#.##%")
+ * #number(300000, "光速为每秒 ,### 公里。")
+ * 
+ * #set(n = 1.234)
+ * #set(p = "#.##")
+ * #number(n, p)
+ * </pre>
+ */
+public class NumberDirective extends Directive {
+	
+	private Expr valueExpr;
+	private Expr patternExpr;
+	private int paraNum;
+	
+	public void setExprList(ExprList exprList) {
+		this.paraNum = exprList.length();
+		if (paraNum == 0) {
+			throw new ParseException("The parameter of #number directive can not be blank", location);
+		}
+		if (paraNum > 2) {
+			throw new ParseException("Wrong number parameter of #number directive, two parameters allowed at most", location);
+		}
+		
+		if (paraNum == 1) {
+			this.valueExpr = exprList.getExpr(0);
+			this.patternExpr = null;
+		} else if (paraNum == 2) {
+			this.valueExpr = exprList.getExpr(0);
+			this.patternExpr = exprList.getExpr(1);
+		}
+	}
+	
+	public void exec(Env env, Scope scope, Writer writer) {
+		Object value = valueExpr.eval(scope);
+		if (value == null) {
+			return ;
+		}
+		
+		if (paraNum == 1) {
+			outputWithoutPattern(writer, value);
+		} else if (paraNum == 2) {
+			outputWithPattern(scope, writer, value);
+		}
+	}
+	
+	private void outputWithoutPattern(Writer writer, Object value) {	
+		String ret = new DecimalFormat().format(value);
+		write(writer, ret);
+	}
+	
+	private void outputWithPattern(Scope scope, Writer writer, Object value) {
+		Object pattern = patternExpr.eval(scope);
+		if ( !(pattern instanceof String) ) {
+			throw new TemplateException("The sencond parameter pattern of #number directive must be String", location);
+		}
+		
+		String ret = new DecimalFormat((String)pattern).format(value);
+		write(writer, ret);
+	}
+}
+
+
+
+
+