109 lines
3.3 KiB
Java
109 lines
3.3 KiB
Java
/**
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* Copyright (c) 2011-2019, 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.ext.directive;
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import java.text.DecimalFormat;
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import com.jfinal.template.Directive;
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import com.jfinal.template.Env;
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import com.jfinal.template.TemplateException;
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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.ParseException;
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import com.jfinal.template.stat.Scope;
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/**
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* #number 数字格式化输出指令
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*
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* 两种用法：
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* 1：#number(n) 用默认 pattern 输出变量中的值
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* 2：#number(n, "#.##") 用第二个参数指定的 pattern 输出变量中的值
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*
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* 注意：
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* 1：pattern 的使用与 java.text.DecimalFormat 的完全一样
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* 在拿不定主意的时候可以在搜索引擎中搜索关键字：DecimalFormat
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* 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
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*
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* <pre>
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* 示例：
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* #number(3.1415926, "#.##")
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* #number(0.9518, "#.##%")
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* #number(300000, "光速为每秒 ,### 公里。")
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*
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* #set(n = 1.234)
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* #set(p = "#.##")
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* #number(n, p)
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* </pre>
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*/
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public class NumberDirective extends Directive {
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private Expr valueExpr;
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private Expr patternExpr;
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private int paraNum;
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public void setExprList(ExprList exprList) {
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this.paraNum = exprList.length();
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if (paraNum == 0) {
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throw new ParseException("The parameter of #number directive can not be blank", location);
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}
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if (paraNum > 2) {
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throw new ParseException("Wrong number parameter of #number directive, two parameters allowed at most", location);
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}
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if (paraNum == 1) {
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this.valueExpr = exprList.getExpr(0);
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this.patternExpr = null;
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} else if (paraNum == 2) {
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this.valueExpr = exprList.getExpr(0);
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this.patternExpr = exprList.getExpr(1);
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}
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}
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public void exec(Env env, Scope scope, Writer writer) {
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Object value = valueExpr.eval(scope);
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if (value == null) {
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return ;
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}
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if (paraNum == 1) {
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outputWithoutPattern(writer, value);
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} else if (paraNum == 2) {
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outputWithPattern(scope, writer, value);
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}
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}
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private void outputWithoutPattern(Writer writer, Object value) {
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String ret = new DecimalFormat().format(value);
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write(writer, ret);
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}
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private void outputWithPattern(Scope scope, Writer writer, Object value) {
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Object pattern = patternExpr.eval(scope);
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if ( !(pattern instanceof String) ) {
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throw new TemplateException("The sencond parameter pattern of #number directive must be String", location);
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}
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String ret = new DecimalFormat((String)pattern).format(value);
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write(writer, ret);
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}
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}
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