Dessert YAML

This library is the base API for YAML modules, written in Rust for WebAssembly.

For simplicity's sake, this module has been written using serde yaml, but at the cost of flexibility. Some feature might be missing for now, like passing parsing options when loading/dumping.

Summary

• Installation
• Performance
• API
• Building

Installation

npm install dessert-yaml-core

Performance

Big file (6.85MB)

| | dessert-yaml | js-yaml | yaml-js | |:---------:|:------------:|:-------:|:--------:| | load | 1904ms | 836ms | 55461ms | | dump | 528ms | 1193ms | 124931ms |

Small file (360 B)

| | dessert-yaml | js-yaml | yaml-js | |:---------:|:------------:|:-------:|:-------:| | load | 1ms | 11ms | 33ms | | dump | 1ms | 8ms | 37ms |

API

This section lists methods exported from Wasm to Javascript.

Note:
Althought this library is usable as-is, it should be used as a dependency for a connector, such as dessert-js-yaml.

yaml = require('dessert-yaml-core');
fs   = require('fs');

// Get document, or throw exception on error
try {
  let doc = yaml.load(fs.readFileSync('/home/ixti/example.yml', 'utf8'));
  console.log(doc);

  // Print the parsed object as a YAML stream
  let yaml_stream = yaml.dump(doc);
  console.log(yaml_stream);
} catch (e) {
  console.log(e);
}

load(string, [, options])

Most simple way of parsing a document. Parses string as single YAML document. Returns a JavaScript object or throws YAMLException on error. options aren't used as for now.

loadSafe(string, [, options])

Same as load()

loadAll(string, [, options])

Same as safeLoad(), but understands multi-document sources. Applies iterator to each document if specified, or returns array of documents. Currently same as load() because serde_yaml doesn't support multi document yet, and data structure from yaml-rust aren't serializable.

dump(object, [, options])

Serializes object as a YAML document

safeDump(objects, [, options])

Same as dump()

Building

The package can be built using wasm-pack

wasm-pack build --target browser

Testing:

wasm-pack test --headless --[firefox|chrome|safari]