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Merge PR #7437: fix(edit): prevent fuzzy replace-all self-matching (@roboomp)

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This commit is contained in:
can1357
2026-08-03 05:15:03 +02:00
parent a95476bad6 aad12ab2f7
commit 4b8c19366d
4 changed files with 106 additions and 29 deletions
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packages/coding-agent/src/edit/modes/replace.ts
+67 -21
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@@ -258,23 +258,41 @@ function formatPreviewWindow(lines: string[], centerIndex: number, options: Prev
.join("\n");
}
function findExactMatchOutcome(content: string, target: string): MatchOutcome | undefined {
const exactIndex = content.indexOf(target);
if (exactIndex === -1) {
function findExactMatchOutcome(
content: string,
target: string,
excludedRanges: readonly { startIndex: number; endIndex: number }[],
): MatchOutcome | undefined {
let firstIndex: number | undefined;
let occurrences = 0;
const recordedIndices: number[] = [];
let searchStart = 0;
while (searchStart <= content.length - target.length) {
const index = content.indexOf(target, searchStart);
if (index === -1) break;
const endIndex = index + target.length;
if (!excludedRanges.some(range => index < range.endIndex && endIndex > range.startIndex)) {
firstIndex ??= index;
occurrences++;
if (recordedIndices.length < MAX_RECORDED_MATCHES) {
recordedIndices.push(index);
}
}
searchStart = endIndex;
}
if (firstIndex === undefined) {
return undefined;
}
const occurrences = content.split(target).length - 1;
if (occurrences > 1) {
const contentLines = content.split("\n");
const occurrenceLines: number[] = [];
const occurrencePreviews: string[] = [];
let searchStart = 0;
for (let i = 0; i < MAX_RECORDED_MATCHES; i++) {
const idx = content.indexOf(target, searchStart);
if (idx === -1) break;
const lineNumber = content.slice(0, idx).split("\n").length;
for (const index of recordedIndices) {
const lineNumber = content.slice(0, index).split("\n").length;
occurrenceLines.push(lineNumber);
occurrencePreviews.push(
formatPreviewWindow(contentLines, lineNumber - 1, {
@@ -282,17 +300,16 @@ function findExactMatchOutcome(content: string, target: string): MatchOutcome |
maxLen: OCCURRENCE_PREVIEW_MAX_LEN,
}),
);
searchStart = idx + 1;
}
return { occurrences, occurrenceLines, occurrencePreviews };
}
const startLine = content.slice(0, exactIndex).split("\n").length;
const startLine = content.slice(0, firstIndex).split("\n").length;
return {
match: {
actualText: target,
startIndex: exactIndex,
startIndex: firstIndex,
startLine,
confidence: 1,
},
@@ -408,6 +425,7 @@ function findBestFuzzyMatchCore(
offsets: number[],
threshold: number,
includeDepth: boolean,
excludedRanges: readonly { startIndex: number; endIndex: number }[],
): BestFuzzyMatchResult {
const targetNormalized = normalizeLines(targetLines, includeDepth);
@@ -417,6 +435,12 @@ function findBestFuzzyMatchCore(
let aboveThresholdCount = 0;
for (let start = 0; start <= contentLines.length - targetLines.length; start++) {
const startIndex = offsets[start];
const endLine = start + targetLines.length - 1;
const endIndex = Math.max(startIndex + 1, offsets[endLine] + contentLines[endLine].length);
if (excludedRanges.some(range => startIndex < range.endIndex && endIndex > range.startIndex)) {
continue;
}
const windowLines = contentLines.slice(start, start + targetLines.length);
const windowNormalized = normalizeLines(windowLines, includeDepth);
let score = 0;
@@ -434,7 +458,7 @@ function findBestFuzzyMatchCore(
bestScore = score;
best = {
actualText: windowLines.join("\n"),
startIndex: offsets[start],
startIndex,
startLine: start + 1,
confidence: score,
};
@@ -446,7 +470,12 @@ function findBestFuzzyMatchCore(
return { best, aboveThresholdCount, secondBestScore };
}
function findBestFuzzyMatch(content: string, target: string, threshold: number): BestFuzzyMatchResult {
function findBestFuzzyMatch(
content: string,
target: string,
threshold: number,
excludedRanges: readonly { startIndex: number; endIndex: number }[],
): BestFuzzyMatchResult {
const contentLines = content.split("\n");
const targetLines = target.split("\n");
@@ -458,11 +487,18 @@ function findBestFuzzyMatch(content: string, target: string, threshold: number):
}
const offsets = computeLineOffsets(contentLines);
let result = findBestFuzzyMatchCore(contentLines, targetLines, offsets, threshold, true);
let result = findBestFuzzyMatchCore(contentLines, targetLines, offsets, threshold, true, excludedRanges);
// Retry without indent depth if match is close but below threshold
if (result.best && result.best.confidence < threshold && result.best.confidence >= FALLBACK_THRESHOLD) {
const noDepthResult = findBestFuzzyMatchCore(contentLines, targetLines, offsets, threshold, false);
const noDepthResult = findBestFuzzyMatchCore(
contentLines,
targetLines,
offsets,
threshold,
false,
excludedRanges,
);
if (noDepthResult.best && noDepthResult.best.confidence > result.best.confidence) {
result = noDepthResult;
}
@@ -473,25 +509,35 @@ function findBestFuzzyMatch(content: string, target: string, threshold: number):
/**
* Find a match for target text within content.
* Used primarily for replace-mode edits.
* Used primarily for replace-mode edits; excluded ranges remain invisible to exact and fuzzy matching.
*/
export function findMatch(
content: string,
target: string,
options: { allowFuzzy: boolean; threshold?: number },
options: {
allowFuzzy: boolean;
threshold?: number;
excludedRanges?: readonly { startIndex: number; endIndex: number }[];
},
): MatchOutcome {
if (target.length === 0) {
return {};
}
const excludedRanges = options.excludedRanges ?? [];
const exactMatch = findExactMatchOutcome(content, target);
const exactMatch = findExactMatchOutcome(content, target, excludedRanges);
if (exactMatch) {
return exactMatch;
}
// Try fuzzy match
const threshold = options.threshold ?? DEFAULT_FUZZY_THRESHOLD;
const { best, aboveThresholdCount, secondBestScore } = findBestFuzzyMatch(content, target, threshold);
const { best, aboveThresholdCount, secondBestScore } = findBestFuzzyMatch(
content,
target,
threshold,
excludedRanges,
);
if (!best) {
return {};