Crate fionn_diff 

JSON Diff/Patch/Merge

High-performance JSON structural operations with SIMD acceleration.

This module provides three related capabilities:

JSON Diff

Generate a list of operations that transform one JSON document into another. Follows the spirit of RFC 6902 (JSON Patch) for the output format.

JSON Patch (RFC 6902)

Apply a sequence of operations to a JSON document:

• add: Insert a value at a path
• remove: Delete a value at a path
• replace: Replace a value at a path
• move: Move a value from one path to another
• copy: Copy a value from one path to another
• test: Verify a value equals the expected value

JSON Merge Patch (RFC 7396)

A simpler merge format where:

• Objects are recursively merged
• null values indicate deletion
• Other values replace existing ones

Performance

Uses SIMD acceleration for:

• Bulk string comparison (detect unchanged strings quickly)
• Array element comparison
• Finding longest common subsequence in arrays

Structs

DiffOptions

Options for diff generation.

JsonPatch

A JSON Patch document (sequence of operations).

JsonPatchRef

A JSON Patch document with zero-copy operations.

Enums

PatchError

Error type for patch operations.

PatchOperation

A single patch operation.

PatchOperationRef

A single patch operation with zero-copy paths where possible.

Functions

apply_patch

Apply a JSON Patch to a value, returning a new value.

apply_patch_mut

Apply a JSON Patch to a value in place.

deep_merge

Deep merge two objects, preferring values from overlay.

json_diff

Generate a JSON Patch that transforms source into target.

json_diff_with_options

Generate a JSON Patch with custom options.

json_diff_zerocopy

Generate a zero-copy JSON Patch that transforms source into target.

json_merge_patch

Apply a JSON Merge Patch (RFC 7396) to a document.

json_numbers_equal

Compare two JSON number representations for equality.

json_strings_equal

Compare two JSON string values for equality.

merge_many

Merge multiple JSON documents using merge patch semantics.

merge_patch_to_value

Generate a merge patch from two JSON documents.

simd_bytes_equal

SIMD-accelerated byte slice equality check.

simd_find_first_difference

Find the first position where two byte slices differ.