Function resolveConfinedPath

src/apply-patch.ts:188–217

(root: string, input: string)

}

async function resolveConfinedPath(root: string, input: string): Promise<string> {
  if (!input || input.includes("\0") || isAbsolute(input)) {
    throw patchError(`path must be relative to the workspace: ${input}`);
  }

  const rootPath = await realpath(root);
  const target = resolve(rootPath, input);
  if (!isInside(rootPath, target)) {
    throw patchError(`path escapes the workspace: ${input}`);
  }

  let existing = target;
  while (true) {
    try {
      const resolved = await realpath(existing);
      if (!isInside(rootPath, resolved)) {
        throw patchError(`path resolves outside the workspace: ${input}`);
      }
      break;
    } catch (error) {
      const code = (error as NodeJS.ErrnoException).code;
      if (code !== "ENOENT") throw error;
      const parent = dirname(existing);
      if (parent === existing) throw error;
      existing = parent;
    }
  }

  return target;
}

function splitFile(content: string): { lines: string[]; eol: string; finalNewline: boolean } {
  const eol = content.includes("\r\n") ? "\r\n" : "\n";