Module edit_replacers 

9-pass fuzzy matching chain for the edit tool.

LLMs frequently produce slightly different whitespace, indentation, or escaping in old_content. This module implements a chain of increasingly flexible matching strategies, tried in order until one succeeds.

Pass order (strictest to most flexible):

1. Simple — exact string match
2. LineTrimmed — trim leading/trailing whitespace per line
3. BlockAnchor — match by first/last lines as anchors, similarity for middle
4. WhitespaceNormalized — collapse all whitespace to single space
5. IndentationFlexible — strip indentation, match stripped content
6. EscapeNormalized — normalize escape sequences
7. TrimmedBoundary — trim first/last lines of old_content
8. ContextAware — use surrounding context lines to locate position
9. MultiOccurrence — trimmed line-by-line match as last resort

Structs

MatchResult

Result of a successful fuzzy match: the actual substring found in the original.

Functions

find_match

Run the 9-pass replacer chain. Returns the actual substring in original that matches old_content, or None if no pass succeeds.

find_occurrence_positions

Find line numbers (1-indexed) of all occurrences of needle in haystack.

normalize_line_endings

Normalize line endings to \n.

unified_diff

Generate a unified diff between two strings (like diff -u).