Class StructuredData

rules.js:52–82

}

class StructuredData extends Rule {
  documentation(context) {
    return {
      description: "Validates JSON-LD according to schema.org"
    };
  }

  setup() {
    let start = -1;

    this.on('tag:open', event => {
      if (event.target.nodeName === 'script') {
        start = event.target.location.offset;
      }
    });

    this.on('tag:close', async event => {
      const tag = event.previous;
      if (event.target.nodeName === 'script' && tag.hasAttribute('type') && tag.getAttribute('type').value === 'application/ld+json') {
        const startIdx = data.indexOf('>', start) + 1;
        const endIdx = event.target.location.offset - 1; // omit the opening tag angled bracket
        const content = data.substring(startIdx, endIdx);
        try {
          JSON.parse(content);
        } catch (err) {
          this.report(tag, `Unable to parse JSON-LD as JSON: ${err}`);
        }
      }
    });
  }
}

let data;