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Applies progressive transformations:\n * - Strip trailing whitespace from each line\n * - Normalize smart quotes to ASCII equivalents\n * - Normalize Unicode dashes/hyphens to ASCII hyphen\n * - Normalize special Unicode spaces to regular space\n */\nexport function normalizeForFuzzyMatch(text: string): string {\n\treturn (\n\t\ttext\n\t\t\t.normalize(\"NFKC\")\n\t\t\t// Strip trailing whitespace per line\n\t\t\t.split(\"\\n\")\n\t\t\t.map((line) => line.trimEnd())\n\t\t\t.join(\"\\n\")\n\t\t\t// Smart single quotes → '\n\t\t\t.replace(/[\\u2018\\u2019\\u201A\\u201B]/g, \"'\")\n\t\t\t// Smart double quotes → \"\n\t\t\t.replace(/[\\u201C\\u201D\\u201E\\u201F]/g, '\"')\n\t\t\t// Various dashes/hyphens → -\n\t\t\t// U+2010 hyphen, U+2011 non-breaking hyphen, U+2012 figure dash,\n\t\t\t// U+2013 en-dash, U+2014 em-dash, U+2015 horizontal bar, U+2212 minus\n\t\t\t.replace(/[\\u2010\\u2011\\u2012\\u2013\\u2014\\u2015\\u2212]/g, \"-\")\n\t\t\t// Special spaces → regular space\n\t\t\t// U+00A0 NBSP, U+2002-U+200A various spaces, U+202F narrow NBSP,\n\t\t\t// U+205F medium math space, U+3000 ideographic space\n\t\t\t.replace(/[\\u00A0\\u2002-\\u200A\\u202F\\u205F\\u3000]/g, \" \")\n\t);\n}\n\nfunction splitLinesWithEndings(content: string): string[] {\n\treturn content.match(/[^\\n]*\\n|[^\\n]+/g) ?? [];\n}\n\ninterface LineSpan {\n\tstart: number;\n\tend: number;\n}\n\ninterface MatchedEdit {\n\teditIndex: number;\n\tmatchIndex: number;\n\tmatchLength: number;\n\tnewText: string;\n}\n\ntype TextReplacement = Pick<MatchedEdit, \"matchIndex\" | \"matchLength\" | \"newText\">;\n\nfunction getLineSpans(content: string): LineSpan[] {\n\tlet offset = 0;\n\treturn splitLinesWithEndings(content).map((line) => {\n\t\tconst span = { start: offset, end: offset + line.length };\n\t\toffset = span.end;\n\t\treturn span;\n\t});\n}\n\nfunction getReplacementLineRange(lines: LineSpan[], replacement: TextReplacement) {\n\tconst replacementStart = replacement.matchIndex;\n\tconst replacementEnd = replacement.matchIndex + replacement.matchLength;\n\n\tlet startLine = -1;\n\tfor (let i = 0; i < lines.length; i++) {\n\t\tconst line = lines[i];\n\t\tif (replacementStart >= line.start && replacementStart < line.end) {\n\t\t\tstartLine = i;\n\t\t\tbreak;\n\t\t}\n\t}\n\tif (startLine === -1) {\n\t\tthrow new Error(\"Replacement range is outside the base content.\");\n\t}\n\n\tlet endLine = startLine;\n\twhile (endLine < lines.length && lines[endLine].end < replacementEnd) {\n\t\tendLine++;\n\t}\n\tif (endLine >= lines.length) {\n\t\tthrow new Error(\"Replacement range is outside the base content.\");\n\t}\n\n\treturn { startLine, endLine: endLine + 1 };\n}\n\nfunction applyReplacements(content: string, replacements: TextReplacement[], offset = 0): string {\n\tlet result = content;\n\tfor (let i = replacements.length - 1; i >= 0; i--) {\n\t\tconst replacement = replacements[i];\n\t\tconst matchIndex = replacement.matchIndex - offset;\n\t\tresult =\n\t\t\tresult.substring(0, matchIndex) + replacement.newText + result.substring(matchIndex + replacement.matchLength);\n\t}\n\treturn result;\n}\n\n/**\n * Apply replacements matched against `baseContent` to `originalContent` while\n * preserving unchanged line blocks from the original.\n *\n * This is useful when `baseContent` is a normalized view of the original. Each\n * replacement is widened to the lines it actually touches, those touched lines\n * are rewritten from the normalized base, and all other lines are copied back\n * from `originalContent`. The actual replacement ranges drive preservation so\n * duplicate normalized lines cannot be aligned to the wrong occurrence.\n */\nexport function applyReplacementsPreservingUnchangedLines(\n\toriginalContent: string,\n\tbaseContent: string,\n\treplacements: TextReplacement[],\n): string {\n\tconst originalLines = splitLinesWithEndings(originalContent);\n\tconst baseLines = getLineSpans(baseContent);\n\tif (originalLines.length !== baseLines.length) {\n\t\tthrow new Error(\"Cannot preserve unchanged lines because the base content has a different line count.\");\n\t}\n\n\tconst groups: Array<{ startLine: number; endLine: number; replacements: TextReplacement[] }> = [];\n\tconst sortedReplacements = [...replacements].sort((a, b) => a.matchIndex - b.matchIndex);\n\tfor (const replacement of sortedReplacements) {\n\t\tconst range = getReplacementLineRange(baseLines, replacement);\n\t\tconst current = groups[groups.length - 1];\n\t\tif (current && range.startLine < current.endLine) {\n\t\t\tcurrent.endLine = Math.max(current.endLine, range.endLine);\n\t\t\tcurrent.replacements.push(replacement);\n\t\t\tcontinue;\n\t\t}\n\t\tgroups.push({ ...range, replacements: [replacement] });\n\t}\n\n\tlet originalLineIndex = 0;\n\tlet result = \"\";\n\tfor (const group of groups) {\n\t\tresult += originalLines.slice(originalLineIndex, group.startLine).join(\"\");\n\n\t\tconst groupStartOffset = baseLines[group.startLine].start;\n\t\tconst groupEndOffset = baseLines[group.endLine - 1].end;\n\t\tresult += applyReplacements(\n\t\t\tbaseContent.slice(groupStartOffset, groupEndOffset),\n\t\t\tgroup.replacements,\n\t\t\tgroupStartOffset,\n\t\t);\n\t\toriginalLineIndex = group.endLine;\n\t}\n\tresult += originalLines.slice(originalLineIndex).join(\"\");\n\n\treturn result;\n}\n\nexport interface FuzzyMatchResult {\n\t/** Whether a match was found */\n\tfound: boolean;\n\t/** The index where the match starts (in the content that should be used for replacement) */\n\tindex: number;\n\t/** Length of the matched text */\n\tmatchLength: number;\n\t/** Whether fuzzy matching was used (false = exact match) */\n\tusedFuzzyMatch: boolean;\n\t/**\n\t * The content to use for replacement operations.\n\t * When exact match: original content. When fuzzy match: normalized content.\n\t */\n\tcontentForReplacement: string;\n}\n\nexport interface Edit {\n\toldText: string;\n\tnewText: string;\n}\n\nexport interface AppliedEditsResult {\n\tbaseContent: string;\n\tnewContent: string;\n}\n\n/**\n * Find oldText in content, trying exact match first, then fuzzy match.\n * When fuzzy matching is used, the returned contentForReplacement is the\n * fuzzy-normalized version of the content (trailing whitespace stripped,\n * Unicode quotes/dashes normalized to ASCII).\n */\nexport function fuzzyFindText(content: string, oldText: string): FuzzyMatchResult {\n\t// Try exact match first\n\tconst exactIndex = content.indexOf(oldText);\n\tif (exactIndex !== -1) {\n\t\treturn {\n\t\t\tfound: true,\n\t\t\tindex: exactIndex,\n\t\t\tmatchLength: oldText.length,\n\t\t\tusedFuzzyMatch: false,\n\t\t\tcontentForReplacement: content,\n\t\t};\n\t}\n\n\t// Try fuzzy match - work entirely in normalized space\n\tconst fuzzyContent = normalizeForFuzzyMatch(content);\n\tconst fuzzyOldText = normalizeForFuzzyMatch(oldText);\n\tconst fuzzyIndex = fuzzyContent.indexOf(fuzzyOldText);\n\n\tif (fuzzyIndex === -1) {\n\t\treturn {\n\t\t\tfound: false,\n\t\t\tindex: -1,\n\t\t\tmatchLength: 0,\n\t\t\tusedFuzzyMatch: false,\n\t\t\tcontentForReplacement: content,\n\t\t};\n\t}\n\n\t// When fuzzy matching, return offsets in normalized space. Callers can use\n\t// the normalized content to compute replacements, then decide how much of\n\t// that normalized output should be written back.\n\treturn {\n\t\tfound: true,\n\t\tindex: fuzzyIndex,\n\t\tmatchLength: fuzzyOldText.length,\n\t\tusedFuzzyMatch: true,\n\t\tcontentForReplacement: fuzzyContent,\n\t};\n}\n\n/** Strip UTF-8 BOM if present, return both the BOM (if any) and the text without it */\nexport function stripBom(content: string): { bom: string; text: string } {\n\treturn content.startsWith(\"\\uFEFF\") ? { bom: \"\\uFEFF\", text: content.slice(1) } : { bom: \"\", text: content };\n}\n\nfunction countOccurrences(content: string, oldText: string): number {\n\tconst fuzzyContent = normalizeForFuzzyMatch(content);\n\tconst fuzzyOldText = normalizeForFuzzyMatch(oldText);\n\treturn fuzzyContent.split(fuzzyOldText).length - 1;\n}\n\nfunction getNotFoundError(path: string, editIndex: number, totalEdits: number): Error {\n\tif (totalEdits === 1) {\n\t\treturn new Error(\n\t\t\t`Could not find the exact text in ${path}. The old text must match exactly including all whitespace and newlines.`,\n\t\t);\n\t}\n\treturn new Error(\n\t\t`Could not find edits[${editIndex}] in ${path}. The oldText must match exactly including all whitespace and newlines.`,\n\t);\n}\n\nfunction getDuplicateError(path: string, editIndex: number, totalEdits: number, occurrences: number): Error {\n\tif (totalEdits === 1) {\n\t\treturn new Error(\n\t\t\t`Found ${occurrences} occurrences of the text in ${path}. The text must be unique. Please provide more context to make it unique.`,\n\t\t);\n\t}\n\treturn new Error(\n\t\t`Found ${occurrences} occurrences of edits[${editIndex}] in ${path}. Each oldText must be unique. Please provide more context to make it unique.`,\n\t);\n}\n\nfunction getEmptyOldTextError(path: string, editIndex: number, totalEdits: number): Error {\n\tif (totalEdits === 1) {\n\t\treturn new Error(`oldText must not be empty in ${path}.`);\n\t}\n\treturn new Error(`edits[${editIndex}].oldText must not be empty in ${path}.`);\n}\n\nfunction getNoChangeError(path: string, totalEdits: number): Error {\n\tif (totalEdits === 1) {\n\t\treturn new Error(\n\t\t\t`No changes made to ${path}. The replacement produced identical content. This might indicate an issue with special characters or the text not existing as expected.`,\n\t\t);\n\t}\n\treturn new Error(`No changes made to ${path}. The replacements produced identical content.`);\n}\n\n/**\n * Apply one or more exact-text replacements to LF-normalized content.\n *\n * All edits are matched against the same original content. Replacements are\n * then applied in reverse order so offsets remain stable. If any edit needs\n * fuzzy matching, the operation runs in fuzzy-normalized content space and then\n * overlays those line-level changes onto the original content so unchanged line\n * blocks keep their original bytes.\n */\nexport function applyEditsToNormalizedContent(\n\tnormalizedContent: string,\n\tedits: Edit[],\n\tpath: string,\n): AppliedEditsResult {\n\tconst normalizedEdits = edits.map((edit) => ({\n\t\toldText: normalizeToLF(edit.oldText),\n\t\tnewText: normalizeToLF(edit.newText),\n\t}));\n\n\tfor (let i = 0; i < normalizedEdits.length; i++) {\n\t\tif (normalizedEdits[i].oldText.length === 0) {\n\t\t\tthrow getEmptyOldTextError(path, i, normalizedEdits.length);\n\t\t}\n\t}\n\n\tconst initialMatches = normalizedEdits.map((edit) => fuzzyFindText(normalizedContent, edit.oldText));\n\tconst usedFuzzyMatch = initialMatches.some((match) => match.usedFuzzyMatch);\n\tconst replacementBaseContent = usedFuzzyMatch ? normalizeForFuzzyMatch(normalizedContent) : normalizedContent;\n\n\tconst matchedEdits: MatchedEdit[] = [];\n\tfor (let i = 0; i < normalizedEdits.length; i++) {\n\t\tconst edit = normalizedEdits[i];\n\t\tconst matchResult = fuzzyFindText(replacementBaseContent, edit.oldText);\n\t\tif (!matchResult.found) {\n\t\t\tthrow getNotFoundError(path, i, normalizedEdits.length);\n\t\t}\n\n\t\tconst occurrences = countOccurrences(replacementBaseContent, edit.oldText);\n\t\tif (occurrences > 1) {\n\t\t\tthrow getDuplicateError(path, i, normalizedEdits.length, occurrences);\n\t\t}\n\n\t\tmatchedEdits.push({\n\t\t\teditIndex: i,\n\t\t\tmatchIndex: matchResult.index,\n\t\t\tmatchLength: matchResult.matchLength,\n\t\t\tnewText: edit.newText,\n\t\t});\n\t}\n\n\tmatchedEdits.sort((a, b) => a.matchIndex - b.matchIndex);\n\tfor (let i = 1; i < matchedEdits.length; i++) {\n\t\tconst previous = matchedEdits[i - 1];\n\t\tconst current = matchedEdits[i];\n\t\tif (previous.matchIndex + previous.matchLength > current.matchIndex) {\n\t\t\tthrow new Error(\n\t\t\t\t`edits[${previous.editIndex}] and edits[${current.editIndex}] overlap in ${path}. Merge them into one edit or target disjoint regions.`,\n\t\t\t);\n\t\t}\n\t}\n\n\tconst baseContent = normalizedContent;\n\tconst newContent = usedFuzzyMatch\n\t\t? applyReplacementsPreservingUnchangedLines(normalizedContent, replacementBaseContent, matchedEdits)\n\t\t: applyReplacements(replacementBaseContent, matchedEdits);\n\n\tif (baseContent === newContent) {\n\t\tthrow getNoChangeError(path, normalizedEdits.length);\n\t}\n\n\treturn { baseContent, newContent };\n}\n\n/** Generate a standard unified patch. */\nexport function generateUnifiedPatch(path: string, oldContent: string, newContent: string, contextLines = 4): string {\n\treturn Diff.createTwoFilesPatch(path, path, oldContent, newContent, undefined, undefined, {\n\t\tcontext: contextLines,\n\t\theaderOptions: Diff.FILE_HEADERS_ONLY,\n\t});\n}\n\n/**\n * Generate a display-oriented diff string with line numbers and context.\n * Returns both the diff string and the first changed line number (in the new file).\n */\nexport function generateDiffString(\n\toldContent: string,\n\tnewContent: string,\n\tcontextLines = 4,\n): { diff: string; firstChangedLine: number | undefined } {\n\tconst parts = Diff.diffLines(oldContent, newContent);\n\tconst output: string[] = [];\n\n\tconst oldLines = oldContent.split(\"\\n\");\n\tconst newLines = newContent.split(\"\\n\");\n\tconst maxLineNum = Math.max(oldLines.length, newLines.length);\n\tconst lineNumWidth = String(maxLineNum).length;\n\n\tlet oldLineNum = 1;\n\tlet newLineNum = 1;\n\tlet lastWasChange = false;\n\tlet firstChangedLine: number | undefined;\n\n\tfor (let i = 0; i < parts.length; i++) {\n\t\tconst part = parts[i];\n\t\tconst raw = part.value.split(\"\\n\");\n\t\tif (raw[raw.length - 1] === \"\") {\n\t\t\traw.pop();\n\t\t}\n\n\t\tif (part.added || part.removed) {\n\t\t\t// Capture the first changed line (in the new file)\n\t\t\tif (firstChangedLine === undefined) {\n\t\t\t\tfirstChangedLine = newLineNum;\n\t\t\t}\n\n\t\t\t// Show the change\n\t\t\tfor (const line of raw) {\n\t\t\t\tif (part.added) {\n\t\t\t\t\tconst lineNum = String(newLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\toutput.push(`+${lineNum} ${line}`);\n\t\t\t\t\tnewLineNum++;\n\t\t\t\t} else {\n\t\t\t\t\t// removed\n\t\t\t\t\tconst lineNum = String(oldLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\toutput.push(`-${lineNum} ${line}`);\n\t\t\t\t\toldLineNum++;\n\t\t\t\t}\n\t\t\t}\n\t\t\tlastWasChange = true;\n\t\t} else {\n\t\t\t// Context lines - only show a few before/after changes\n\t\t\tconst nextPartIsChange = i < parts.length - 1 && (parts[i + 1].added || parts[i + 1].removed);\n\t\t\tconst hasLeadingChange = lastWasChange;\n\t\t\tconst hasTrailingChange = nextPartIsChange;\n\n\t\t\tif (hasLeadingChange && hasTrailingChange) {\n\t\t\t\tif (raw.length <= contextLines * 2) {\n\t\t\t\t\tfor (const line of raw) {\n\t\t\t\t\t\tconst lineNum = String(oldLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\t\toutput.push(` ${lineNum} ${line}`);\n\t\t\t\t\t\toldLineNum++;\n\t\t\t\t\t\tnewLineNum++;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tconst leadingLines = raw.slice(0, contextLines);\n\t\t\t\t\tconst trailingLines = raw.slice(raw.length - contextLines);\n\t\t\t\t\tconst skippedLines = raw.length - leadingLines.length - trailingLines.length;\n\n\t\t\t\t\tfor (const line of leadingLines) {\n\t\t\t\t\t\tconst lineNum = String(oldLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\t\toutput.push(` ${lineNum} ${line}`);\n\t\t\t\t\t\toldLineNum++;\n\t\t\t\t\t\tnewLineNum++;\n\t\t\t\t\t}\n\n\t\t\t\t\toutput.push(` ${\"\".padStart(lineNumWidth, \" \")} ...`);\n\t\t\t\t\toldLineNum += skippedLines;\n\t\t\t\t\tnewLineNum += skippedLines;\n\n\t\t\t\t\tfor (const line of trailingLines) {\n\t\t\t\t\t\tconst lineNum = String(oldLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\t\toutput.push(` ${lineNum} ${line}`);\n\t\t\t\t\t\toldLineNum++;\n\t\t\t\t\t\tnewLineNum++;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} else if (hasLeadingChange) {\n\t\t\t\tconst shownLines = raw.slice(0, contextLines);\n\t\t\t\tconst skippedLines = raw.length - shownLines.length;\n\n\t\t\t\tfor (const line of shownLines) {\n\t\t\t\t\tconst lineNum = String(oldLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\toutput.push(` ${lineNum} ${line}`);\n\t\t\t\t\toldLineNum++;\n\t\t\t\t\tnewLineNum++;\n\t\t\t\t}\n\n\t\t\t\tif (skippedLines > 0) {\n\t\t\t\t\toutput.push(` ${\"\".padStart(lineNumWidth, \" \")} ...`);\n\t\t\t\t\toldLineNum += skippedLines;\n\t\t\t\t\tnewLineNum += skippedLines;\n\t\t\t\t}\n\t\t\t} else if (hasTrailingChange) {\n\t\t\t\tconst skippedLines = Math.max(0, raw.length - contextLines);\n\t\t\t\tif (skippedLines > 0) {\n\t\t\t\t\toutput.push(` ${\"\".padStart(lineNumWidth, \" \")} ...`);\n\t\t\t\t\toldLineNum += skippedLines;\n\t\t\t\t\tnewLineNum += skippedLines;\n\t\t\t\t}\n\n\t\t\t\tfor (const line of raw.slice(skippedLines)) {\n\t\t\t\t\tconst lineNum = String(oldLineNum).padStart(lineNumWidth, \" \");\n\t\t\t\t\toutput.push(` ${lineNum} ${line}`);\n\t\t\t\t\toldLineNum++;\n\t\t\t\t\tnewLineNum++;\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Skip these context lines entirely\n\t\t\t\toldLineNum += raw.length;\n\t\t\t\tnewLineNum += raw.length;\n\t\t\t}\n\n\t\t\tlastWasChange = false;\n\t\t}\n\t}\n\n\treturn { diff: output.join(\"\\n\"), firstChangedLine };\n}\n\nexport interface EditDiffResult {\n\tdiff: string;\n\tfirstChangedLine: number | undefined;\n}\n\nexport interface EditDiffError {\n\terror: string;\n}\n\n/**\n * Compute the diff for one or more edit operations without applying them.\n * Used for preview rendering in the TUI before the tool executes.\n */\nexport async function computeEditsDiff(\n\tpath: string,\n\tedits: Edit[],\n\tcwd: string,\n): Promise<EditDiffResult | EditDiffError> {\n\tconst absolutePath = resolveToCwd(path, cwd);\n\n\ttry {\n\t\t// Check if file exists and is readable\n\t\ttry {\n\t\t\tawait access(absolutePath, constants.R_OK);\n\t\t} catch (error: unknown) {\n\t\t\tconst errorMessage = error instanceof Error && \"code\" in error ? `Error code: ${error.code}` : String(error);\n\t\t\treturn { error: `Could not edit file: ${path}. ${errorMessage}.` };\n\t\t}\n\n\t\t// Read the file\n\t\tconst rawContent = await readFile(absolutePath, \"utf-8\");\n\n\t\t// Strip BOM before matching (LLM won't include invisible BOM in oldText)\n\t\tconst { text: content } = stripBom(rawContent);\n\t\tconst normalizedContent = normalizeToLF(content);\n\t\tconst { baseContent, newContent } = applyEditsToNormalizedContent(normalizedContent, edits, path);\n\n\t\t// Generate the diff\n\t\treturn generateDiffString(baseContent, newContent);\n\t} catch (err) {\n\t\treturn { error: err instanceof Error ? err.message : String(err) };\n\t}\n}\n\n/**\n * Compute the diff for a single edit operation without applying it.\n * Kept as a convenience wrapper for single-edit callers.\n */\nexport async function computeEditDiff(\n\tpath: string,\n\toldText: string,\n\tnewText: string,\n\tcwd: string,\n): Promise<EditDiffResult | EditDiffError> {\n\treturn computeEditsDiff(path, [{ oldText, newText }], cwd);\n}\n"]}