Method getLines

lib/internal/test_runner/coverage.js:92–153

(fileUrl, source)

  #includeMatchers = null;

  getLines(fileUrl, source) {
    // Split the file source into lines. Make sure the lines maintain their
    // original line endings because those characters are necessary for
    // determining offsets in the file.
    if (this.#sourceLines.has(fileUrl)) {
      return this.#sourceLines.get(fileUrl);
    }

    try {
      source ??= readFileSync(fileURLToPath(fileUrl), 'utf8');
    } catch {
      // The file can no longer be read. It may have been deleted among
      // other possibilities. Leave it out of the coverage report.
      this.#sourceLines.set(fileUrl, null);
      return;
    }

    const linesWithBreaks =
      RegExpPrototypeSymbolSplit(kLineSplitRegex, source);
    let ignoreCount = 0;
    let enabled = true;
    let offset = 0;

    const lines = ArrayPrototypeMap(linesWithBreaks, (line, i) => {
      const startOffset = offset;
      const coverageLine = new CoverageLine(i + 1, startOffset, line);

      offset += line.length;

      // Determine if this line is being ignored.
      if (ignoreCount > 0) {
        ignoreCount--;
        coverageLine.ignore = true;
      } else if (!enabled) {
        coverageLine.ignore = true;
      }

      if (!coverageLine.ignore) {
        // If this line is not already being ignored, check for ignore
        // comments.
        const match = RegExpPrototypeExec(kIgnoreRegex, line);

        if (match !== null) {
          ignoreCount = NumberParseInt(match.groups?.count ?? 1, 10);
        }
      }

      // Check for comments to enable/disable coverage no matter what. These
      // take precedence over ignore comments.
      const match = RegExpPrototypeExec(kStatusRegex, line);
      const status = match?.groups?.status;

      if (status) {
        ignoreCount = 0;
        enabled = status === 'enable';
      }

      return coverageLine;