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import z from "zod"
import * as path from "path"
import * as fs from "fs/promises"
import { readFileSync } from "fs"
import { Log } from "../util/log"
export namespace Patch {
const log = Log.create({ service: "patch" })
// Schema definitions
export const PatchSchema = z.object({
patchText: z.string().describe("The full patch text that describes all changes to be made"),
})
export type PatchParams = z.infer<typeof PatchSchema>
// Core types matching the Rust implementation
export interface ApplyPatchArgs {
patch: string
hunks: Hunk[]
workdir?: string
}
export type Hunk =
| { type: "add"; path: string; contents: string }
| { type: "delete"; path: string }
| { type: "update"; path: string; move_path?: string; chunks: UpdateFileChunk[] }
export interface UpdateFileChunk {
old_lines: string[]
new_lines: string[]
change_context?: string
is_end_of_file?: boolean
}
export interface ApplyPatchAction {
changes: Map<string, ApplyPatchFileChange>
patch: string
cwd: string
}
export type ApplyPatchFileChange =
| { type: "add"; content: string }
| { type: "delete"; content: string }
| { type: "update"; unified_diff: string; move_path?: string; new_content: string }
export interface AffectedPaths {
added: string[]
modified: string[]
deleted: string[]
}
export enum ApplyPatchError {
ParseError = "ParseError",
IoError = "IoError",
ComputeReplacements = "ComputeReplacements",
ImplicitInvocation = "ImplicitInvocation",
}
export enum MaybeApplyPatch {
Body = "Body",
ShellParseError = "ShellParseError",
PatchParseError = "PatchParseError",
NotApplyPatch = "NotApplyPatch",
}
export enum MaybeApplyPatchVerified {
Body = "Body",
ShellParseError = "ShellParseError",
CorrectnessError = "CorrectnessError",
NotApplyPatch = "NotApplyPatch",
}
// Parser implementation
function parsePatchHeader(
lines: string[],
startIdx: number,
): { filePath: string; movePath?: string; nextIdx: number } | null {
const line = lines[startIdx]
if (line.startsWith("*** Add File:")) {
const filePath = line.split(":", 2)[1]?.trim()
return filePath ? { filePath, nextIdx: startIdx + 1 } : null
}
if (line.startsWith("*** Delete File:")) {
const filePath = line.split(":", 2)[1]?.trim()
return filePath ? { filePath, nextIdx: startIdx + 1 } : null
}
if (line.startsWith("*** Update File:")) {
const filePath = line.split(":", 2)[1]?.trim()
let movePath: string | undefined
let nextIdx = startIdx + 1
// Check for move directive
if (nextIdx < lines.length && lines[nextIdx].startsWith("*** Move to:")) {
movePath = lines[nextIdx].split(":", 2)[1]?.trim()
nextIdx++
}
return filePath ? { filePath, movePath, nextIdx } : null
}
return null
}
function parseUpdateFileChunks(lines: string[], startIdx: number): { chunks: UpdateFileChunk[]; nextIdx: number } {
const chunks: UpdateFileChunk[] = []
let i = startIdx
while (i < lines.length && !lines[i].startsWith("***")) {
if (lines[i].startsWith("@@")) {
// Parse context line
const contextLine = lines[i].substring(2).trim()
i++
const oldLines: string[] = []
const newLines: string[] = []
let isEndOfFile = false
// Parse change lines
while (i < lines.length && !lines[i].startsWith("@@") && !lines[i].startsWith("***")) {
const changeLine = lines[i]
if (changeLine === "*** End of File") {
isEndOfFile = true
i++
break
}
if (changeLine.startsWith(" ")) {
// Keep line - appears in both old and new
const content = changeLine.substring(1)
oldLines.push(content)
newLines.push(content)
} else if (changeLine.startsWith("-")) {
// Remove line - only in old
oldLines.push(changeLine.substring(1))
} else if (changeLine.startsWith("+")) {
// Add line - only in new
newLines.push(changeLine.substring(1))
}
i++
}
chunks.push({
old_lines: oldLines,
new_lines: newLines,
change_context: contextLine || undefined,
is_end_of_file: isEndOfFile || undefined,
})
} else {
i++
}
}
return { chunks, nextIdx: i }
}
function parseAddFileContent(lines: string[], startIdx: number): { content: string; nextIdx: number } {
let content = ""
let i = startIdx
while (i < lines.length && !lines[i].startsWith("***")) {
if (lines[i].startsWith("+")) {
content += lines[i].substring(1) + "\n"
}
i++
}
// Remove trailing newline
if (content.endsWith("\n")) {
content = content.slice(0, -1)
}
return { content, nextIdx: i }
}
function stripHeredoc(input: string): string {
// Match heredoc patterns like: cat <<'EOF'\n...\nEOF or <<EOF\n...\nEOF
const heredocMatch = input.match(/^(?:cat\s+)?<<['"]?(\w+)['"]?\s*\n([\s\S]*?)\n\1\s*$/)
if (heredocMatch) {
return heredocMatch[2]
}
return input
}
export function parsePatch(patchText: string): { hunks: Hunk[] } {
const cleaned = stripHeredoc(patchText.trim())
const lines = cleaned.split("\n")
const hunks: Hunk[] = []
let i = 0
// Look for Begin/End patch markers
const beginMarker = "*** Begin Patch"
const endMarker = "*** End Patch"
const beginIdx = lines.findIndex((line) => line.trim() === beginMarker)
const endIdx = lines.findIndex((line) => line.trim() === endMarker)
if (beginIdx === -1 || endIdx === -1 || beginIdx >= endIdx) {
throw new Error("Invalid patch format: missing Begin/End markers")
}
// Parse content between markers
i = beginIdx + 1
while (i < endIdx) {
const header = parsePatchHeader(lines, i)
if (!header) {
i++
continue
}
if (lines[i].startsWith("*** Add File:")) {
const { content, nextIdx } = parseAddFileContent(lines, header.nextIdx)
hunks.push({
type: "add",
path: header.filePath,
contents: content,
})
i = nextIdx
} else if (lines[i].startsWith("*** Delete File:")) {
hunks.push({
type: "delete",
path: header.filePath,
})
i = header.nextIdx
} else if (lines[i].startsWith("*** Update File:")) {
const { chunks, nextIdx } = parseUpdateFileChunks(lines, header.nextIdx)
hunks.push({
type: "update",
path: header.filePath,
move_path: header.movePath,
chunks,
})
i = nextIdx
} else {
i++
}
}
return { hunks }
}
// Apply patch functionality
export function maybeParseApplyPatch(
argv: string[],
):
| { type: MaybeApplyPatch.Body; args: ApplyPatchArgs }
| { type: MaybeApplyPatch.PatchParseError; error: Error }
| { type: MaybeApplyPatch.NotApplyPatch } {
const APPLY_PATCH_COMMANDS = ["apply_patch", "applypatch"]
// Direct invocation: apply_patch <patch>
if (argv.length === 2 && APPLY_PATCH_COMMANDS.includes(argv[0])) {
try {
const { hunks } = parsePatch(argv[1])
return {
type: MaybeApplyPatch.Body,
args: {
patch: argv[1],
hunks,
},
}
} catch (error) {
return {
type: MaybeApplyPatch.PatchParseError,
error: error as Error,
}
}
}
// Bash heredoc form: bash -lc 'apply_patch <<"EOF" ...'
if (argv.length === 3 && argv[0] === "bash" && argv[1] === "-lc") {
// Simple extraction - in real implementation would need proper bash parsing
const script = argv[2]
const heredocMatch = script.match(/apply_patch\s*<<['"](\w+)['"]\s*\n([\s\S]*?)\n\1/)
if (heredocMatch) {
const patchContent = heredocMatch[2]
try {
const { hunks } = parsePatch(patchContent)
return {
type: MaybeApplyPatch.Body,
args: {
patch: patchContent,
hunks,
},
}
} catch (error) {
return {
type: MaybeApplyPatch.PatchParseError,
error: error as Error,
}
}
}
}
return { type: MaybeApplyPatch.NotApplyPatch }
}
// File content manipulation
interface ApplyPatchFileUpdate {
unified_diff: string
content: string
}
export function deriveNewContentsFromChunks(filePath: string, chunks: UpdateFileChunk[]): ApplyPatchFileUpdate {
// Read original file content
let originalContent: string
try {
originalContent = readFileSync(filePath, "utf-8")
} catch (error) {
throw new Error(`Failed to read file ${filePath}: ${error}`)
}
let originalLines = originalContent.split("\n")
// Drop trailing empty element for consistent line counting
if (originalLines.length > 0 && originalLines[originalLines.length - 1] === "") {
originalLines.pop()
}
const replacements = computeReplacements(originalLines, filePath, chunks)
let newLines = applyReplacements(originalLines, replacements)
// Ensure trailing newline
if (newLines.length === 0 || newLines[newLines.length - 1] !== "") {
newLines.push("")
}
const newContent = newLines.join("\n")
// Generate unified diff
const unifiedDiff = generateUnifiedDiff(originalContent, newContent)
return {
unified_diff: unifiedDiff,
content: newContent,
}
}
function computeReplacements(
originalLines: string[],
filePath: string,
chunks: UpdateFileChunk[],
): Array<[number, number, string[]]> {
const replacements: Array<[number, number, string[]]> = []
let lineIndex = 0
for (const chunk of chunks) {
// Handle context-based seeking
if (chunk.change_context) {
const contextIdx = seekSequence(originalLines, [chunk.change_context], lineIndex)
if (contextIdx === -1) {
throw new Error(`Failed to find context '${chunk.change_context}' in ${filePath}`)
}
lineIndex = contextIdx + 1
}
// Handle pure addition (no old lines)
if (chunk.old_lines.length === 0) {
const insertionIdx =
originalLines.length > 0 && originalLines[originalLines.length - 1] === ""
? originalLines.length - 1
: originalLines.length
replacements.push([insertionIdx, 0, chunk.new_lines])
continue
}
// Try to match old lines in the file
let pattern = chunk.old_lines
let newSlice = chunk.new_lines
let found = seekSequence(originalLines, pattern, lineIndex, chunk.is_end_of_file)
// Retry without trailing empty line if not found
if (found === -1 && pattern.length > 0 && pattern[pattern.length - 1] === "") {
pattern = pattern.slice(0, -1)
if (newSlice.length > 0 && newSlice[newSlice.length - 1] === "") {
newSlice = newSlice.slice(0, -1)
}
found = seekSequence(originalLines, pattern, lineIndex, chunk.is_end_of_file)
}
if (found !== -1) {
replacements.push([found, pattern.length, newSlice])
lineIndex = found + pattern.length
} else {
throw new Error(`Failed to find expected lines in ${filePath}:\n${chunk.old_lines.join("\n")}`)
}
}
// Sort replacements by index to apply in order
replacements.sort((a, b) => a[0] - b[0])
return replacements
}
function applyReplacements(lines: string[], replacements: Array<[number, number, string[]]>): string[] {
// Apply replacements in reverse order to avoid index shifting
const result = [...lines]
for (let i = replacements.length - 1; i >= 0; i--) {
const [startIdx, oldLen, newSegment] = replacements[i]
// Remove old lines
result.splice(startIdx, oldLen)
// Insert new lines
for (let j = 0; j < newSegment.length; j++) {
result.splice(startIdx + j, 0, newSegment[j])
}
}
return result
}
// Normalize Unicode punctuation to ASCII equivalents (like Rust's normalize_unicode)
function normalizeUnicode(str: string): string {
return str
.replace(/[\u2018\u2019\u201A\u201B]/g, "'") // single quotes
.replace(/[\u201C\u201D\u201E\u201F]/g, '"') // double quotes
.replace(/[\u2010\u2011\u2012\u2013\u2014\u2015]/g, "-") // dashes
.replace(/\u2026/g, "...") // ellipsis
.replace(/\u00A0/g, " ") // non-breaking space
}
type Comparator = (a: string, b: string) => boolean
function tryMatch(lines: string[], pattern: string[], startIndex: number, compare: Comparator, eof: boolean): number {
// If EOF anchor, try matching from end of file first
if (eof) {
const fromEnd = lines.length - pattern.length
if (fromEnd >= startIndex) {
let matches = true
for (let j = 0; j < pattern.length; j++) {
if (!compare(lines[fromEnd + j], pattern[j])) {
matches = false
break
}
}
if (matches) return fromEnd
}
}
// Forward search from startIndex
for (let i = startIndex; i <= lines.length - pattern.length; i++) {
let matches = true
for (let j = 0; j < pattern.length; j++) {
if (!compare(lines[i + j], pattern[j])) {
matches = false
break
}
}
if (matches) return i
}
return -1
}
function seekSequence(lines: string[], pattern: string[], startIndex: number, eof = false): number {
if (pattern.length === 0) return -1
// Pass 1: exact match
const exact = tryMatch(lines, pattern, startIndex, (a, b) => a === b, eof)
if (exact !== -1) return exact
// Pass 2: rstrip (trim trailing whitespace)
const rstrip = tryMatch(lines, pattern, startIndex, (a, b) => a.trimEnd() === b.trimEnd(), eof)
if (rstrip !== -1) return rstrip
// Pass 3: trim (both ends)
const trim = tryMatch(lines, pattern, startIndex, (a, b) => a.trim() === b.trim(), eof)
if (trim !== -1) return trim
// Pass 4: normalized (Unicode punctuation to ASCII)
const normalized = tryMatch(
lines,
pattern,
startIndex,
(a, b) => normalizeUnicode(a.trim()) === normalizeUnicode(b.trim()),
eof,
)
return normalized
}
function generateUnifiedDiff(oldContent: string, newContent: string): string {
const oldLines = oldContent.split("\n")
const newLines = newContent.split("\n")
// Simple diff generation - in a real implementation you'd use a proper diff algorithm
let diff = "@@ -1 +1 @@\n"
// Find changes (simplified approach)
const maxLen = Math.max(oldLines.length, newLines.length)
let hasChanges = false
for (let i = 0; i < maxLen; i++) {
const oldLine = oldLines[i] || ""
const newLine = newLines[i] || ""
if (oldLine !== newLine) {
if (oldLine) diff += `-${oldLine}\n`
if (newLine) diff += `+${newLine}\n`
hasChanges = true
} else if (oldLine) {
diff += ` ${oldLine}\n`
}
}
return hasChanges ? diff : ""
}
// Apply hunks to filesystem
export async function applyHunksToFiles(hunks: Hunk[]): Promise<AffectedPaths> {
if (hunks.length === 0) {
throw new Error("No files were modified.")
}
const added: string[] = []
const modified: string[] = []
const deleted: string[] = []
for (const hunk of hunks) {
switch (hunk.type) {
case "add":
// Create parent directories
const addDir = path.dirname(hunk.path)
if (addDir !== "." && addDir !== "/") {
await fs.mkdir(addDir, { recursive: true })
}
await fs.writeFile(hunk.path, hunk.contents, "utf-8")
added.push(hunk.path)
log.info(`Added file: ${hunk.path}`)
break
case "delete":
await fs.unlink(hunk.path)
deleted.push(hunk.path)
log.info(`Deleted file: ${hunk.path}`)
break
case "update":
const fileUpdate = deriveNewContentsFromChunks(hunk.path, hunk.chunks)
if (hunk.move_path) {
// Handle file move
const moveDir = path.dirname(hunk.move_path)
if (moveDir !== "." && moveDir !== "/") {
await fs.mkdir(moveDir, { recursive: true })
}
await fs.writeFile(hunk.move_path, fileUpdate.content, "utf-8")
await fs.unlink(hunk.path)
modified.push(hunk.move_path)
log.info(`Moved file: ${hunk.path} -> ${hunk.move_path}`)
} else {
// Regular update
await fs.writeFile(hunk.path, fileUpdate.content, "utf-8")
modified.push(hunk.path)
log.info(`Updated file: ${hunk.path}`)
}
break
}
}
return { added, modified, deleted }
}
// Main patch application function
export async function applyPatch(patchText: string): Promise<AffectedPaths> {
const { hunks } = parsePatch(patchText)
return applyHunksToFiles(hunks)
}
// Async version of maybeParseApplyPatchVerified
export async function maybeParseApplyPatchVerified(
argv: string[],
cwd: string,
): Promise<
| { type: MaybeApplyPatchVerified.Body; action: ApplyPatchAction }
| { type: MaybeApplyPatchVerified.CorrectnessError; error: Error }
| { type: MaybeApplyPatchVerified.NotApplyPatch }
> {
// Detect implicit patch invocation (raw patch without apply_patch command)
if (argv.length === 1) {
try {
parsePatch(argv[0])
return {
type: MaybeApplyPatchVerified.CorrectnessError,
error: new Error(ApplyPatchError.ImplicitInvocation),
}
} catch {
// Not a patch, continue
}
}
const result = maybeParseApplyPatch(argv)
switch (result.type) {
case MaybeApplyPatch.Body:
const { args } = result
const effectiveCwd = args.workdir ? path.resolve(cwd, args.workdir) : cwd
const changes = new Map<string, ApplyPatchFileChange>()
for (const hunk of args.hunks) {
const resolvedPath = path.resolve(
effectiveCwd,
hunk.type === "update" && hunk.move_path ? hunk.move_path : hunk.path,
)
switch (hunk.type) {
case "add":
changes.set(resolvedPath, {
type: "add",
content: hunk.contents,
})
break
case "delete":
// For delete, we need to read the current content
const deletePath = path.resolve(effectiveCwd, hunk.path)
try {
const content = await fs.readFile(deletePath, "utf-8")
changes.set(resolvedPath, {
type: "delete",
content,
})
} catch (error) {
return {
type: MaybeApplyPatchVerified.CorrectnessError,
error: new Error(`Failed to read file for deletion: ${deletePath}`),
}
}
break
case "update":
const updatePath = path.resolve(effectiveCwd, hunk.path)
try {
const fileUpdate = deriveNewContentsFromChunks(updatePath, hunk.chunks)
changes.set(resolvedPath, {
type: "update",
unified_diff: fileUpdate.unified_diff,
move_path: hunk.move_path ? path.resolve(effectiveCwd, hunk.move_path) : undefined,
new_content: fileUpdate.content,
})
} catch (error) {
return {
type: MaybeApplyPatchVerified.CorrectnessError,
error: error as Error,
}
}
break
}
}
return {
type: MaybeApplyPatchVerified.Body,
action: {
changes,
patch: args.patch,
cwd: effectiveCwd,
},
}
case MaybeApplyPatch.PatchParseError:
return {
type: MaybeApplyPatchVerified.CorrectnessError,
error: result.error,
}
case MaybeApplyPatch.NotApplyPatch:
return { type: MaybeApplyPatchVerified.NotApplyPatch }
}
}
}