public toString()

in src/o-tree.ts [260:309]

• 39 lines of code
• 10 McCabe index (conditional complexity)

  public toString() {
    // Strip trailing whitespace from every line, and empty lines from the start and end
    return this.fragments
      .map((item, index, fragments) => {
        if (typeof item !== 'object') {
          return item;
        }
        const ignore = '';

        const leading = fragments.slice(0, index).reverse();
        for (const fragment of leading) {
          if (typeof fragment === 'object') {
            // We don't emit if there was already a conditional newline just before
            return ignore;
          }
          // If there's a trailing newline, then we don't emit this one
          if (/\n\s*$/m.exec(fragment)) {
            return ignore;
          }
          // If it contained non-whitespace characters, we need to check trailing data...
          if (/[^\s]/.exec(fragment)) {
            break;
          }
        }

        const newlineAndIndent = `\n${this.indentChar.repeat(item.conditionalNewLine.indent)}`;

        const trailing = fragments.slice(index + 1);
        for (const fragment of trailing) {
          if (typeof fragment === 'object') {
            // We're the first of a sequence, so we must emit (unless we returned earlier, of course)
            return newlineAndIndent;
          }
          // If there's a leading newline, then we don't emit this one
          if (/^\s*\n/m.exec(fragment)) {
            return ignore;
          }
          // If it contained non-whitespace characters, we emit this one
          if (/[^\s]/.exec(fragment)) {
            return newlineAndIndent;
          }
        }

        return ignore;
      })
      .join('')
      .replace(/[ \t]+$/gm, '')
      .replace(/^\n+/, '')
      .replace(/\n+$/, '');
  }