Freemarker Parser is a javascript implementation of the Freemarker (https://freemarker.apache.org).

This project contains experimental version of parser ftl to ast tree

You can install freemarker-parser using npm:

$ npm install freemarker-parser --save-dev

Require freemarker-parser inside of your JavaScript:

<#assign f=1>

<#if f gt 0>
  ${f} > 0
<#else>
  ${f} < 0
</#if>

const freemarker = require('freemarker-parser');

const parser = new freemarker.Parser();
const data = parser.parse(template);

console.log(data.ast);
console.log(data.tokens);

[#assign f=1]

[#if f gt 0]
  ${f} > 0
[#else]
  ${f} < 0
[/#if]

const freemarker = require('freemarker-parser');

const parser = new freemarker.Parser();
const data = parser.parse(template, {
  useSquareTags: true,
  parseLocation: true,
});

console.log(data.ast);
console.log(data.tokens);

• interpolations ${foo}
  • methods, i.e. ${avg(3, 5)}
• executing macro
• directives https://freemarker.apache.org/docs/ref_directives.html:
  • #attempt
    • #recover
  • #assign
  • #global
  • #local
  • #if
    • #elseif
    • #else
  • #list
    • #else
    • #break
    • #continue
    • #items
  • #include
  • #import
  • #macro
  • #switch
    • #case
    • #default
    • #break
  • #compress
  • #function
    • #return
  • #parse - #noparse
  • #stop
  • #setting
  • #lt
  • #t
  • #nt
  • #rt
  • #flush
  • #escape
    • #noescape
  • #autoesc
  • #noautoesc
  • #outputformat
  • #ftl
• comments <#-- -->
• built-ins:
  • ?toUpperCase
  • ?toLowerCase
  • ?capitalize
  • ?length
  • ?string("yes", "no")
• support default values, i.e. ${user!"Anonymous"}

• directives:
  • #fallback
  • #nested
  • #recurse
  • #visit