如何使用 jmustache 库获取模板参数？

Question

我正在尝试获取所有模板参数 - {{}} 中的参数名称。例如，对于此模板：{{pet}}追着{{toy}}我想要“宠物”和“玩具”我只能使用samskivert/jmustache 库，所以我不能使用不同的 mustache 库。有没有办法用 jmustache 做到这一点，这样我就不必用正则表达式解析字符串了？

Answer 1

Mustache.Visitor用于访问模板中的标签而不执行它

例子：

List<String> vars = new ArrayList<>();

Template tmpl = ... // compile your template

tmpl.visit(new Mustache.Visitor() {

  // I assume you don't care about the raw text or include directives

  public void visitText(String text) {}

  // You do care about variables, per your example

  public void visitVariable(String name) {vars.add("Variable: " + name); }

  // Also makes sense to visit nested templates.

  public boolean visitInclude(String name) { vars.add("Include: " + name); return true; }

  // I assume you also care about sections and inverted sections

  public boolean visitSection(String name) { vars.add("Section: " + name); return true; }

  public boolean visitInvertedSection(String name) { vars.add("Inverted Section: " + name); return true; }

});

Visitor从 1.15 版开始可用jmustache：

<groupId>com.samskivert</groupId>

<artifactId>jmustache</artifactId>

<version>1.15</version>

Answer 2

实际上有一种使用Visitor模式的机制https://github.com/samskivert/jmustache/issues/108#issuecomment-510071602但它尚未发布https://github.com/samskivert/jmustache/issues/109#issue- 466358322