在 Java Mustache 中为模板添加格式化功能

Question

我有一个 Java Mustache 应用程序，我需要应用一个函数以货币格式呈现它

我有我的模板

{{#currency}}{{number_to_format}}{{/currency}}

还有我的函数

HashMap<String, Object> scopes = new HashMap<String, Object>();

//Add date 
scopes.put("number_to_format",BigDecimal.ONE);
scopes.put("currency", new TemplateFunction() {
          public String apply(String input) {
            NumberFormat currency = NumberFormat.getCurrencyInstance();
            return currency.format(new BigDecimal(input));                          
              
          }
      }
);

MustacheFactory mf = new DefaultMustacheFactory();
Mustache mustache = mf.compile("template.mustache");
mustache.execute(writer,scopes).flush();

我无法获取“输入”变量中的值，我总是获取变量名称“number_to_format”。如果我 return 函数中的一个值，它将被渲染。

如何获取输入变量的数值？

Answer 1

输入变量为传入模板，需要渲染获取值
因此再次使用相同的工厂和范围渲染它并获得值

HashMap<String, Object> scopes = new HashMap<String, Object>();
        
final MustacheFactory mf = new DefaultMustacheFactory();
// Add date
scopes.put("number_to_format", BigDecimal.ONE);
scopes.put("currency", new TemplateFunction() {
    public String apply(String input) {
        //render the input as template to get the value
        Mustache mustache = mf.compile(new StringReader(input), "");
        StringWriter out = new StringWriter();
        mustache.execute(out, scopes);
        
        NumberFormat currency = NumberFormat.getCurrencyInstance(Locale.US);
        return currency.format(new BigDecimal(out.toString()));

    }
});


Mustache mustache = mf.compile("template.mustache");
mustache.execute(new PrintWriter(System.out), scopes).flush();

否则通过检查输入从 HashMap 中获取值

if(input.equals("{{number_to_format}}")){
    input = scopes.get("number_to_format").toString();
}

NumberFormat currency = NumberFormat.getCurrencyInstance(Locale.US);
return currency.format(new BigDecimal(input));

否则删除“{{”和“}}”并将其用作哈希映射的键

在 Java Mustache 中为模板添加格式化功能

Add formating function to Template in Java Mustache

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