categories = ["algorithms", "text-synchronization"]

[dependencies]

percent-encoding = "2"

serde = { version = "1", features = ["derive"], optional = true }

serde_repr = { version = "0", optional = true }

[features]

serde = ["dep:serde", "dep:serde_repr"]

default = ["serde"]

use core::str;

use std::{char, collections::HashMap, fmt::Display};

use percent_encoding::{percent_decode, percent_encode, CONTROLS};

#[cfg(feature = "serde")]

use serde::{Deserialize, Serialize};

/// Defaults to true, which does a faster, slightly less optimal diff.

checklines: Option<bool>,

/// A default timeout in num milliseconda, defaults to 1000 (1 second)

/// At what point is no match declared (0.0 = perfection, 1.0 = very loose).

match_threshold: f32,

/// How far to search for a match (0 = exact location, 1000+ = broad match).

fn default() -> Self {

Self {

checklines: Some(true),

match_threshold: 0.5,

match_distance: 1000,

match_max_bits: 32,

}

// returns the configured timeout, defaults to `1`, None or `0` would mean infinite timeout

self.timeout

}

// returns configured match_threshold

old_bytes: &'a [u8],

new_bytes: &'a [u8],

linemode: bool,

) -> Result<Vec<Diff<u8>>, crate::errors::Error> {

// First, check if lhs and rhs are equal

if old_bytes == new_bytes {

&old_bytes[common_prefix..old_bytes.len() - common_suffix],

&new_bytes[common_prefix..new_bytes.len() - common_suffix],

linemode,

)?;

// Restore the prefix and suffix.

old: &'a [u8],

new: &'a [u8],

linemode: bool,

) -> Result<Vec<Diff<u8>>, crate::errors::Error> {

// returning all of the new part

if old.is_empty() {

let mid_common = half_match.common;

// Send both pairs off for separate processing.

Ok(d) => d,

Err(_) => return Err(crate::errors::Error::Utf8Error),

};

Ok(d) => d,

Err(_) => return Err(crate::errors::Error::Utf8Error),

};

}

if linemode && old.len() > 100 && new.len() > 100 {

}

Ok(b) => Ok(b),

Err(_) => Err(crate::errors::Error::Utf8Error),

}

new: &'a [T],

) -> Option<HalfMatch<'a, T>> {

// Don't risk returning a suboptimal diff when we have unlimited time

let (long, short) = if old.len() > new.len() {

(old, new)

&self,

old: &'a [u8],

new: &'a [u8],

) -> Result<Vec<Diff<u8>>, crate::errors::Error> {

let mut diffs = {

let to_chars = Self::lines_to_chars(old, new);

// Convert diffs back to text

Self::chars_to_lines(&diffs[..], &to_chars.lines[..])

};

pointer = idxstart;

let mut subdiffs =

let subdifflen = subdiffs.len();

subdiffs.drain(..).rev().for_each(|d| {

diffs.insert(pointer, d);

&self,

old: &'a [usize],

new: &'a [usize],

) -> Result<Vec<Diff<usize>>, crate::errors::Error> {

if old == new {

if old.is_empty() {

let mut diffs = self.compute_lines(

&old[common_prefix..old.len() - common_suffix],

&new[common_prefix..new.len() - common_suffix],

)?;

if common_prefix > 0 {

&self,

old: &'a [usize],

new: &'a [usize],

) -> Result<Vec<Diff<usize>>, crate::errors::Error> {

// returning all of the new part

if old.is_empty() {

let mid_common = half_match.common;

// Send both pairs off for separate processing.

Ok(d) => d,

Err(_) => return Err(crate::errors::Error::Utf8Error),

};

Ok(d) => d,

Err(_) => return Err(crate::errors::Error::Utf8Error),

};

return Ok(diffs_a);

}

Ok(b) => Ok(b),

Err(_) => Err(crate::errors::Error::Utf8Error),

}

&self,

old: &'a [T],

new: &'a [T],

) -> Result<Vec<Diff<T>>, crate::errors::Error> {

let old_len = old.len() as i32;

let new_len = new.len() as i32;

for d in 0..max_d {

// Bail out if deadline is reached.

}

// Walk the front path one step

for k1 in (k1start - d..d - k1end + 1).step_by(2) {

new,

x1 as usize,

y1 as usize,

);

}

}

new,

x1 as usize,

y1 as usize,

);

}

}

return Ok((source.to_vec(), vec![]));

}

// To avoid changes to original patches!!

let mut patches = patches.clone();

.concat();

} else {

// Imperfect match. Run a diff to get a framework of equivalent indices.

if txt_old.len() > self.match_max_bits()

&& (Self::diff_levenshtein(&diffs) as f32 / txt_old.len() as f32)

> self.delete_threshold()

/// Returns:

/// Vec of changes (Diff).

pub fn diff_main(&self, old: &str, new: &str) -> Result<Vec<Diff<u8>>, crate::errors::Error> {

}

/// A diff of two unrelated texts can be filled with coincidental matches.

#[cfg(test)]

mod tests {

use crate::dmp::{Diff, HalfMatch, LineToChars};

);

// Optimal no halfmatch.

assert!(dmp

.half_match("qHilloHelloHew".as_bytes(), "xHelloHeHulloy".as_bytes())

.is_none());

#[test]

fn test_diff_bisect() -> Result<(), crate::errors::Error> {

// Normal.

// Since the resulting diff hasn't been normalized, it would be ok if

Diff::delete(b"t"),

Diff::insert(b"p")

],

);

// Timeout.

assert_eq!(

vec![Diff::delete(b"cat"), Diff::insert(b"map"),],

);

Ok(())

// Perform a trivial diff.

// Null case.

assert_eq!(

vec![

Diff::delete(b"Apple"),

);

// Timeout.

dmp.timeout = Some(LOW_TIMEOUT);

let a = vec!["`Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.\n"; 2048].join("");

let b = vec!["I am the very model of a modern major general,\nI\'ve information vegetable, animal, and mineral,\nI know the kings of England, and I quote the fights historical,\nFrom Marathon to Waterloo, in order categorical.\n"; 2048].join("");

dmp.diff_main(&a, &b)?;

// Test that we took at least the timeout period (+ 5ms being generous).

// Test the linemode speedup.

// Must be long to pass the 100 char cutoff.

let a = "12345678901234567890123456789 0123456 78901234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n1234567890\n";

let b = "abcdefghij abcdefghij abcdefghij abcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\nabcdefghij\n";

dmp.checklines = Some(false);

let res_no_lm = dmp.diff_main(a, b)?;

dmp.checklines = Some(true);

let res_yes_lm = dmp.diff_main(a, b)?;

// Now, we'll run 2 checks - one for result equality, two for speedup

assert_eq!(res_no_lm, res_yes_lm);

pub mod errors;

pub mod traits;

use crate::dmp::{Diff, DiffMatchPatch};

new: &[Self],

x: usize,

y: usize,

) -> Result<Vec<Diff<Self>>, crate::errors::Error>;

}

new: &[u8],

x: usize,

y: usize,

) -> Result<Vec<Diff<u8>>, crate::errors::Error> {

let old_a = &old[..x];

let new_a = &new[..y];

let new_b = &new[y..];

// Compute both diffs serially.

Ok(diffs_a)

}

new: &[usize],

x: usize,

y: usize,

) -> Result<Vec<Diff<usize>>, crate::errors::Error> {

let old_a = &old[..x];

let new_a = &new[..y];

let new_b = &new[y..];

// Compute both diffs serially.

Ok(diffs_a)

}