Function parsePatch

src/apply-patch.ts:47–157

(patch: string)

}

export function parsePatch(patch: string): PatchAction[] {
  const lines = patchLines(patch);
  if (lines.shift()?.trim() !== "*** Begin Patch") {
    throw patchError("missing *** Begin Patch marker");
  }
  if (lines.pop()?.trim() !== "*** End Patch") {
    throw patchError("missing *** End Patch marker");
  }

  const actions: PatchAction[] = [];
  let index = 0;

  while (index < lines.length) {
    const header = lines[index++].trim();
    if (header === "") continue;

    if (header.startsWith("*** Environment ID: ")) {
      if (!header.slice("*** Environment ID: ".length).trim()) {
        throw patchError("environment id cannot be empty");
      }
      continue;
    }

    if (header.startsWith("*** Add File: ")) {
      const path = header.slice("*** Add File: ".length);
      const content: string[] = [];
      while (index < lines.length && !isTopLevelHeader(lines[index])) {
        const line = lines[index++];
        if (!line.startsWith("+")) {
          throw patchError(`added file line must start with +: ${line}`);
        }
        content.push(line.slice(1));
      }
      if (content.length === 0) throw patchError(`add file for ${path} has no content`);
      actions.push({
        kind: "add",
        path,
        content: `${content.join("\n")}\n`,
      });
      continue;
    }

    if (header.startsWith("*** Delete File: ")) {
      actions.push({ kind: "delete", path: header.slice("*** Delete File: ".length) });
      continue;
    }

    if (header.startsWith("*** Update File: ")) {
      const path = header.slice("*** Update File: ".length);
      let moveTo: string | undefined;
      const hunks: UpdateHunk[] = [];

      if (lines[index]?.trim().startsWith("*** Move to: ")) {
        moveTo = lines[index++].trim().slice("*** Move to: ".length);
      }

      let current: UpdateHunk | undefined;
      const finishCurrent = (): void => {