JSLT

Everyones favorite XSLT but for json

Rust port for Schibsted's jslt

use jslt::Jslt;
use serde_json::json;

fn main() -> Result<(), Box<dyn std::error::Error>> {
  let jslt: Jslt = r#"
  {
    "result" : {
      for (.menu.popup.menuitem)
        .value : .onclick
    }
  }
  "#
  .parse()?;

  let input = json!({
    "menu": {
      "popup": {
        "menuitem": [
          {
            "value": "Open",
            "onclick": "OpenDoc()"
          },
          {
            "value": "Close",
            "onclick": "CloseDoc()"
          }
        ]
      }
    }
  });

  let output = jslt.transform_value(&input)?;

  assert_eq!(
    output,
    json!({
      "result" : {
        "Open" : "OpenDoc()",
        "Close" : "CloseDoc()"
      }
    })
  );

  Ok(())
}

Status: POC

There is very minial support for selectors, constants and for loops and no garantee this will continue any further in the current phase.

Quick support reference:

• .
• .<name>
• .[<index>]
• .[<from> : <to>]
• if (<expr>) <expr> else <expr>
• let <name> = <expr>
• $<name>
• [for (<expr>) <expr>]
• {for (<expr>) <expr> : <expr>}
• def <name>(<name>, <name>...) <expr>
• // <anything up to end of line>
• { <key> : <expr> }
• { <key> : <expr>, * : . }
• 5 * 7 + 23.2
• 7 < 5
• 7 < 5 and .foo == "yes"

Based on Quick reference

Current Goals:

• Create context for function registration and scopes for variables
• Enable #![no_std] sooner than later for possible nodejs support *

* with std cargo flag for regular use.