All files / istanbul-lib-instrument/src ignored-lines.ts

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const IGNORE_LINES_PATTERN = /\s*istanbul\s+ignore\s+(start|stop)/;
const EOL_PATTERN = /\r?\n/g;
 
/**
 * Parse ignore start/stop hints from **text file** based on regular expressions
 * - Does not understand what a comment is in Javascript (or JSX, Vue, Svelte)
 * - Parses source code (JS, TS, Vue, Svelte, anything) based on text search by
 *   matching for `/* istanbul ignore start *\/` pattern - not by looking for real comments
 *
 * ```js
 * /* istanbul ignore start *\/
 * <!-- /* istanbul ignore start *\/ -->
 * <SomeFrameworkComment content="/* istanbul ignore start *\/">
 * ```
 */
function getIgnoredLines(text: string | null | undefined): Set<number> {
  if (!text) {
    return new Set();
  }
 
  const ranges: { start: number; stop: number }[] = [];
  let lineNumber = 0;
 
  for (const line of text.split(EOL_PATTERN)) {
    lineNumber++;
 
    const match = line.match(IGNORE_LINES_PATTERN);
    if (match) {
      const type = match[1];
 
      if (type === "stop") {
        const previous = ranges[ranges.length - 1];
 
        // Ignore whole "ignore stop" if no previous start was found
        if (previous && previous.stop === Infinity) {
          previous.stop = lineNumber;
        }
 
        continue;
      }
 
      ranges.push({ start: lineNumber, stop: Infinity });
    }
  }
 
  const ignoredLines = new Set<number>();
 
  for (const range of ranges) {
    for (let line = range.start; line <= range.stop; line++) {
      ignoredLines.add(line);
 
      if (line >= lineNumber) {
        break;
      }
    }
  }
 
  return ignoredLines;
}
 
export { getIgnoredLines };