Function parsePatch

src/core/tools/apply-patch/parser.ts:297–332

(patch: string)

 * @throws ParseError if the patch is invalid
 */
export function parsePatch(patch: string): ApplyPatchArgs {
	const trimmedPatch = patch.trim()
	const lines = trimmedPatch.split("\n")

	// Handle heredoc-wrapped patches (lenient mode)
	let effectiveLines = lines
	if (lines.length >= 4) {
		const firstLine = lines[0]
		const lastLine = lines[lines.length - 1]
		if (
			(firstLine === "<<EOF" || firstLine === "<<'EOF'" || firstLine === '<<"EOF"') &&
			lastLine?.endsWith("EOF")
		) {
			effectiveLines = lines.slice(1, lines.length - 1)
		}
	}

	checkPatchBoundaries(effectiveLines)

	const hunks: Hunk[] = []
	const lastLineIndex = effectiveLines.length - 1
	let remainingLines = effectiveLines.slice(1, lastLineIndex) // Skip Begin and End markers
	let lineNumber = 2 // Start at line 2 (after Begin Patch)

	while (remainingLines.length > 0) {
		const { hunk, linesConsumed } = parseOneHunk(remainingLines, lineNumber)
		hunks.push(hunk)
		lineNumber += linesConsumed
		remainingLines = remainingLines.slice(linesConsumed)
	}

	return {
		hunks,
		patch: effectiveLines.join("\n"),
	}
}