HtmlDataExtractor.ts

export class HtmlDataExtractor {
  public extractArray(html: string, variableName: string): string | null {
    const startPattern = `let ${variableName} = `;
    const startIndex = html.indexOf(startPattern);

    if (startIndex === -1) {
      return null;
    }

    let cursor = startIndex + startPattern.length;

    while (cursor < html.length && /\s/.test(html[cursor])) {
      cursor++;
    }

    if (html[cursor] !== '[') {
      return null;
    }

    let bracketCount = 0;
    const startDataIndex = cursor;

    bracketCount++;
    cursor++;

    while (cursor < html.length && bracketCount > 0) {
      if (html[cursor] === '[') {
        bracketCount++;
      } else if (html[cursor] === ']') {
        bracketCount--;
      }
      cursor++;
    }

    if (bracketCount === 0) {
      return html.substring(startDataIndex, cursor);
    }

    return null;
  }

  public extractGlobalDefinitions(html: string): string | null {
    const definitionsRegex = /(?:let|const) GLOBAL_DEFINITIONS = (\{.*?\});/;
    const match = html.match(definitionsRegex);
    return match && match[1] ? match[1] : null;
  }
}