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edit.ts
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// the approaches in this edit tool are sourced from
// https://github.com/cline/cline/blob/main/evals/diff-edits/diff-apply/diff-06-23-25.ts
// https://github.com/google-gemini/gemini-cli/blob/main/packages/core/src/utils/editCorrector.ts
// https://github.com/cline/cline/blob/main/evals/diff-edits/diff-apply/diff-06-26-25.ts
import z from "zod"
import * as path from "path"
import { Tool } from "./tool"
import { LSP } from "../lsp"
import { createTwoFilesPatch, diffLines } from "diff"
import DESCRIPTION from "./edit.txt"
import { File } from "../file"
import { FileWatcher } from "../file/watcher"
import { Bus } from "../bus"
import { FileTime } from "../file/time"
import { Filesystem } from "../util/filesystem"
import { Instance } from "../project/instance"
import { Snapshot } from "@/snapshot"
import { assertExternalDirectory } from "./external-directory"
const MAX_DIAGNOSTICS_PER_FILE = 20
function normalizeLineEndings(text: string): string {
return text.replaceAll("\r\n", "\n")
}
function detectLineEnding(text: string): "\n" | "\r\n" {
return text.includes("\r\n") ? "\r\n" : "\n"
}
function convertToLineEnding(text: string, ending: "\n" | "\r\n"): string {
if (ending === "\n") return text
return text.replaceAll("\n", "\r\n")
}
export const EditTool = Tool.define("edit", {
description: DESCRIPTION,
parameters: z.object({
filePath: z.string().describe("The absolute path to the file to modify"),
oldString: z.string().describe("The text to replace"),
newString: z.string().describe("The text to replace it with (must be different from oldString)"),
replaceAll: z.boolean().optional().describe("Replace all occurrences of oldString (default false)"),
}),
async execute(params, ctx) {
if (!params.filePath) {
throw new Error("filePath is required")
}
if (params.oldString === params.newString) {
throw new Error("No changes to apply: oldString and newString are identical.")
}
const filePath = path.isAbsolute(params.filePath) ? params.filePath : path.join(Instance.directory, params.filePath)
await assertExternalDirectory(ctx, filePath)
let diff = ""
let contentOld = ""
let contentNew = ""
await FileTime.withLock(filePath, async () => {
if (params.oldString === "") {
const existed = await Filesystem.exists(filePath)
contentNew = params.newString
diff = trimDiff(createTwoFilesPatch(filePath, filePath, contentOld, contentNew))
await ctx.ask({
permission: "edit",
patterns: [path.relative(Instance.worktree, filePath)],
always: ["*"],
metadata: {
filepath: filePath,
diff,
},
})
await Filesystem.write(filePath, params.newString)
await Bus.publish(File.Event.Edited, {
file: filePath,
})
await Bus.publish(FileWatcher.Event.Updated, {
file: filePath,
event: existed ? "change" : "add",
})
FileTime.read(ctx.sessionID, filePath)
return
}
const stats = Filesystem.stat(filePath)
if (!stats) throw new Error(`File ${filePath} not found`)
if (stats.isDirectory()) throw new Error(`Path is a directory, not a file: ${filePath}`)
await FileTime.assert(ctx.sessionID, filePath)
contentOld = await Filesystem.readText(filePath)
const ending = detectLineEnding(contentOld)
const old = convertToLineEnding(normalizeLineEndings(params.oldString), ending)
const next = convertToLineEnding(normalizeLineEndings(params.newString), ending)
contentNew = replace(contentOld, old, next, params.replaceAll)
diff = trimDiff(
createTwoFilesPatch(filePath, filePath, normalizeLineEndings(contentOld), normalizeLineEndings(contentNew)),
)
await ctx.ask({
permission: "edit",
patterns: [path.relative(Instance.worktree, filePath)],
always: ["*"],
metadata: {
filepath: filePath,
diff,
},
})
await Filesystem.write(filePath, contentNew)
await Bus.publish(File.Event.Edited, {
file: filePath,
})
await Bus.publish(FileWatcher.Event.Updated, {
file: filePath,
event: "change",
})
contentNew = await Filesystem.readText(filePath)
diff = trimDiff(
createTwoFilesPatch(filePath, filePath, normalizeLineEndings(contentOld), normalizeLineEndings(contentNew)),
)
FileTime.read(ctx.sessionID, filePath)
})
const filediff: Snapshot.FileDiff = {
file: filePath,
before: contentOld,
after: contentNew,
additions: 0,
deletions: 0,
}
for (const change of diffLines(contentOld, contentNew)) {
if (change.added) filediff.additions += change.count || 0
if (change.removed) filediff.deletions += change.count || 0
}
ctx.metadata({
metadata: {
diff,
filediff,
diagnostics: {},
},
})
let output = "Edit applied successfully."
await LSP.touchFile(filePath, true)
const diagnostics = await LSP.diagnostics()
const normalizedFilePath = Filesystem.normalizePath(filePath)
const issues = diagnostics[normalizedFilePath] ?? []
const errors = issues.filter((item) => item.severity === 1)
if (errors.length > 0) {
const limited = errors.slice(0, MAX_DIAGNOSTICS_PER_FILE)
const suffix =
errors.length > MAX_DIAGNOSTICS_PER_FILE ? `\n... and ${errors.length - MAX_DIAGNOSTICS_PER_FILE} more` : ""
output += `\n\nLSP errors detected in this file, please fix:\n<diagnostics file="${filePath}">\n${limited.map(LSP.Diagnostic.pretty).join("\n")}${suffix}\n</diagnostics>`
}
return {
metadata: {
diagnostics,
diff,
filediff,
},
title: `${path.relative(Instance.worktree, filePath)}`,
output,
}
},
})
export type Replacer = (content: string, find: string) => Generator<string, void, unknown>
// Similarity thresholds for block anchor fallback matching
const SINGLE_CANDIDATE_SIMILARITY_THRESHOLD = 0.0
const MULTIPLE_CANDIDATES_SIMILARITY_THRESHOLD = 0.3
/**
* Levenshtein distance algorithm implementation
*/
function levenshtein(a: string, b: string): number {
// Handle empty strings
if (a === "" || b === "") {
return Math.max(a.length, b.length)
}
const matrix = Array.from({ length: a.length + 1 }, (_, i) =>
Array.from({ length: b.length + 1 }, (_, j) => (i === 0 ? j : j === 0 ? i : 0)),
)
for (let i = 1; i <= a.length; i++) {
for (let j = 1; j <= b.length; j++) {
const cost = a[i - 1] === b[j - 1] ? 0 : 1
matrix[i][j] = Math.min(matrix[i - 1][j] + 1, matrix[i][j - 1] + 1, matrix[i - 1][j - 1] + cost)
}
}
return matrix[a.length][b.length]
}
export const SimpleReplacer: Replacer = function* (_content, find) {
yield find
}
export const LineTrimmedReplacer: Replacer = function* (content, find) {
const originalLines = content.split("\n")
const searchLines = find.split("\n")
if (searchLines[searchLines.length - 1] === "") {
searchLines.pop()
}
for (let i = 0; i <= originalLines.length - searchLines.length; i++) {
let matches = true
for (let j = 0; j < searchLines.length; j++) {
const originalTrimmed = originalLines[i + j].trim()
const searchTrimmed = searchLines[j].trim()
if (originalTrimmed !== searchTrimmed) {
matches = false
break
}
}
if (matches) {
let matchStartIndex = 0
for (let k = 0; k < i; k++) {
matchStartIndex += originalLines[k].length + 1
}
let matchEndIndex = matchStartIndex
for (let k = 0; k < searchLines.length; k++) {
matchEndIndex += originalLines[i + k].length
if (k < searchLines.length - 1) {
matchEndIndex += 1 // Add newline character except for the last line
}
}
yield content.substring(matchStartIndex, matchEndIndex)
}
}
}
export const BlockAnchorReplacer: Replacer = function* (content, find) {
const originalLines = content.split("\n")
const searchLines = find.split("\n")
if (searchLines.length < 3) {
return
}
if (searchLines[searchLines.length - 1] === "") {
searchLines.pop()
}
const firstLineSearch = searchLines[0].trim()
const lastLineSearch = searchLines[searchLines.length - 1].trim()
const searchBlockSize = searchLines.length
// Collect all candidate positions where both anchors match
const candidates: Array<{ startLine: number; endLine: number }> = []
for (let i = 0; i < originalLines.length; i++) {
if (originalLines[i].trim() !== firstLineSearch) {
continue
}
// Look for the matching last line after this first line
for (let j = i + 2; j < originalLines.length; j++) {
if (originalLines[j].trim() === lastLineSearch) {
candidates.push({ startLine: i, endLine: j })
break // Only match the first occurrence of the last line
}
}
}
// Return immediately if no candidates
if (candidates.length === 0) {
return
}
// Handle single candidate scenario (using relaxed threshold)
if (candidates.length === 1) {
const { startLine, endLine } = candidates[0]
const actualBlockSize = endLine - startLine + 1
let similarity = 0
let linesToCheck = Math.min(searchBlockSize - 2, actualBlockSize - 2) // Middle lines only
if (linesToCheck > 0) {
for (let j = 1; j < searchBlockSize - 1 && j < actualBlockSize - 1; j++) {
const originalLine = originalLines[startLine + j].trim()
const searchLine = searchLines[j].trim()
const maxLen = Math.max(originalLine.length, searchLine.length)
if (maxLen === 0) {
continue
}
const distance = levenshtein(originalLine, searchLine)
similarity += (1 - distance / maxLen) / linesToCheck
// Exit early when threshold is reached
if (similarity >= SINGLE_CANDIDATE_SIMILARITY_THRESHOLD) {
break
}
}
} else {
// No middle lines to compare, just accept based on anchors
similarity = 1.0
}
if (similarity >= SINGLE_CANDIDATE_SIMILARITY_THRESHOLD) {
let matchStartIndex = 0
for (let k = 0; k < startLine; k++) {
matchStartIndex += originalLines[k].length + 1
}
let matchEndIndex = matchStartIndex
for (let k = startLine; k <= endLine; k++) {
matchEndIndex += originalLines[k].length
if (k < endLine) {
matchEndIndex += 1 // Add newline character except for the last line
}
}
yield content.substring(matchStartIndex, matchEndIndex)
}
return
}
// Calculate similarity for multiple candidates
let bestMatch: { startLine: number; endLine: number } | null = null
let maxSimilarity = -1
for (const candidate of candidates) {
const { startLine, endLine } = candidate
const actualBlockSize = endLine - startLine + 1
let similarity = 0
let linesToCheck = Math.min(searchBlockSize - 2, actualBlockSize - 2) // Middle lines only
if (linesToCheck > 0) {
for (let j = 1; j < searchBlockSize - 1 && j < actualBlockSize - 1; j++) {
const originalLine = originalLines[startLine + j].trim()
const searchLine = searchLines[j].trim()
const maxLen = Math.max(originalLine.length, searchLine.length)
if (maxLen === 0) {
continue
}
const distance = levenshtein(originalLine, searchLine)
similarity += 1 - distance / maxLen
}
similarity /= linesToCheck // Average similarity
} else {
// No middle lines to compare, just accept based on anchors
similarity = 1.0
}
if (similarity > maxSimilarity) {
maxSimilarity = similarity
bestMatch = candidate
}
}
// Threshold judgment
if (maxSimilarity >= MULTIPLE_CANDIDATES_SIMILARITY_THRESHOLD && bestMatch) {
const { startLine, endLine } = bestMatch
let matchStartIndex = 0
for (let k = 0; k < startLine; k++) {
matchStartIndex += originalLines[k].length + 1
}
let matchEndIndex = matchStartIndex
for (let k = startLine; k <= endLine; k++) {
matchEndIndex += originalLines[k].length
if (k < endLine) {
matchEndIndex += 1
}
}
yield content.substring(matchStartIndex, matchEndIndex)
}
}
export const WhitespaceNormalizedReplacer: Replacer = function* (content, find) {
const normalizeWhitespace = (text: string) => text.replace(/\s+/g, " ").trim()
const normalizedFind = normalizeWhitespace(find)
// Handle single line matches
const lines = content.split("\n")
for (let i = 0; i < lines.length; i++) {
const line = lines[i]
if (normalizeWhitespace(line) === normalizedFind) {
yield line
} else {
// Only check for substring matches if the full line doesn't match
const normalizedLine = normalizeWhitespace(line)
if (normalizedLine.includes(normalizedFind)) {
// Find the actual substring in the original line that matches
const words = find.trim().split(/\s+/)
if (words.length > 0) {
const pattern = words.map((word) => word.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")).join("\\s+")
try {
const regex = new RegExp(pattern)
const match = line.match(regex)
if (match) {
yield match[0]
}
} catch (e) {
// Invalid regex pattern, skip
}
}
}
}
}
// Handle multi-line matches
const findLines = find.split("\n")
if (findLines.length > 1) {
for (let i = 0; i <= lines.length - findLines.length; i++) {
const block = lines.slice(i, i + findLines.length)
if (normalizeWhitespace(block.join("\n")) === normalizedFind) {
yield block.join("\n")
}
}
}
}
export const IndentationFlexibleReplacer: Replacer = function* (content, find) {
const removeIndentation = (text: string) => {
const lines = text.split("\n")
const nonEmptyLines = lines.filter((line) => line.trim().length > 0)
if (nonEmptyLines.length === 0) return text
const minIndent = Math.min(
...nonEmptyLines.map((line) => {
const match = line.match(/^(\s*)/)
return match ? match[1].length : 0
}),
)
return lines.map((line) => (line.trim().length === 0 ? line : line.slice(minIndent))).join("\n")
}
const normalizedFind = removeIndentation(find)
const contentLines = content.split("\n")
const findLines = find.split("\n")
for (let i = 0; i <= contentLines.length - findLines.length; i++) {
const block = contentLines.slice(i, i + findLines.length).join("\n")
if (removeIndentation(block) === normalizedFind) {
yield block
}
}
}
export const EscapeNormalizedReplacer: Replacer = function* (content, find) {
const unescapeString = (str: string): string => {
return str.replace(/\\(n|t|r|'|"|`|\\|\n|\$)/g, (match, capturedChar) => {
switch (capturedChar) {
case "n":
return "\n"
case "t":
return "\t"
case "r":
return "\r"
case "'":
return "'"
case '"':
return '"'
case "`":
return "`"
case "\\":
return "\\"
case "\n":
return "\n"
case "$":
return "$"
default:
return match
}
})
}
const unescapedFind = unescapeString(find)
// Try direct match with unescaped find string
if (content.includes(unescapedFind)) {
yield unescapedFind
}
// Also try finding escaped versions in content that match unescaped find
const lines = content.split("\n")
const findLines = unescapedFind.split("\n")
for (let i = 0; i <= lines.length - findLines.length; i++) {
const block = lines.slice(i, i + findLines.length).join("\n")
const unescapedBlock = unescapeString(block)
if (unescapedBlock === unescapedFind) {
yield block
}
}
}
export const MultiOccurrenceReplacer: Replacer = function* (content, find) {
// This replacer yields all exact matches, allowing the replace function
// to handle multiple occurrences based on replaceAll parameter
let startIndex = 0
while (true) {
const index = content.indexOf(find, startIndex)
if (index === -1) break
yield find
startIndex = index + find.length
}
}
export const TrimmedBoundaryReplacer: Replacer = function* (content, find) {
const trimmedFind = find.trim()
if (trimmedFind === find) {
// Already trimmed, no point in trying
return
}
// Try to find the trimmed version
if (content.includes(trimmedFind)) {
yield trimmedFind
}
// Also try finding blocks where trimmed content matches
const lines = content.split("\n")
const findLines = find.split("\n")
for (let i = 0; i <= lines.length - findLines.length; i++) {
const block = lines.slice(i, i + findLines.length).join("\n")
if (block.trim() === trimmedFind) {
yield block
}
}
}
export const ContextAwareReplacer: Replacer = function* (content, find) {
const findLines = find.split("\n")
if (findLines.length < 3) {
// Need at least 3 lines to have meaningful context
return
}
// Remove trailing empty line if present
if (findLines[findLines.length - 1] === "") {
findLines.pop()
}
const contentLines = content.split("\n")
// Extract first and last lines as context anchors
const firstLine = findLines[0].trim()
const lastLine = findLines[findLines.length - 1].trim()
// Find blocks that start and end with the context anchors
for (let i = 0; i < contentLines.length; i++) {
if (contentLines[i].trim() !== firstLine) continue
// Look for the matching last line
for (let j = i + 2; j < contentLines.length; j++) {
if (contentLines[j].trim() === lastLine) {
// Found a potential context block
const blockLines = contentLines.slice(i, j + 1)
const block = blockLines.join("\n")
// Check if the middle content has reasonable similarity
// (simple heuristic: at least 50% of non-empty lines should match when trimmed)
if (blockLines.length === findLines.length) {
let matchingLines = 0
let totalNonEmptyLines = 0
for (let k = 1; k < blockLines.length - 1; k++) {
const blockLine = blockLines[k].trim()
const findLine = findLines[k].trim()
if (blockLine.length > 0 || findLine.length > 0) {
totalNonEmptyLines++
if (blockLine === findLine) {
matchingLines++
}
}
}
if (totalNonEmptyLines === 0 || matchingLines / totalNonEmptyLines >= 0.5) {
yield block
break // Only match the first occurrence
}
}
break
}
}
}
}
export function trimDiff(diff: string): string {
const lines = diff.split("\n")
const contentLines = lines.filter(
(line) =>
(line.startsWith("+") || line.startsWith("-") || line.startsWith(" ")) &&
!line.startsWith("---") &&
!line.startsWith("+++"),
)
if (contentLines.length === 0) return diff
let min = Infinity
for (const line of contentLines) {
const content = line.slice(1)
if (content.trim().length > 0) {
const match = content.match(/^(\s*)/)
if (match) min = Math.min(min, match[1].length)
}
}
if (min === Infinity || min === 0) return diff
const trimmedLines = lines.map((line) => {
if (
(line.startsWith("+") || line.startsWith("-") || line.startsWith(" ")) &&
!line.startsWith("---") &&
!line.startsWith("+++")
) {
const prefix = line[0]
const content = line.slice(1)
return prefix + content.slice(min)
}
return line
})
return trimmedLines.join("\n")
}
export function replace(content: string, oldString: string, newString: string, replaceAll = false): string {
if (oldString === newString) {
throw new Error("No changes to apply: oldString and newString are identical.")
}
let notFound = true
for (const replacer of [
SimpleReplacer,
LineTrimmedReplacer,
BlockAnchorReplacer,
WhitespaceNormalizedReplacer,
IndentationFlexibleReplacer,
EscapeNormalizedReplacer,
TrimmedBoundaryReplacer,
ContextAwareReplacer,
MultiOccurrenceReplacer,
]) {
for (const search of replacer(content, oldString)) {
const index = content.indexOf(search)
if (index === -1) continue
notFound = false
if (replaceAll) {
return content.replaceAll(search, newString)
}
const lastIndex = content.lastIndexOf(search)
if (index !== lastIndex) continue
return content.substring(0, index) + newString + content.substring(index + search.length)
}
}
if (notFound) {
throw new Error(
"Could not find oldString in the file. It must match exactly, including whitespace, indentation, and line endings.",
)
}
throw new Error("Found multiple matches for oldString. Provide more surrounding context to make the match unique.")
}