//! Myers' diff algorithm. //! //! * time: `O((N+M)D)` //! * space `O(N+M)` //! //! See [the original article by Eugene W. Myers](http://www.xmailserver.org/diff2.pdf) //! describing it. //! //! The implementation of this algorithm is based on the implementation by //! Brandon Williams. //! //! # Heuristics //! //! At present this implementation of Myers' does not implement any more advanced //! heuristics that would solve some pathological cases. For instance passing two //! large and completely distinct sequences to the algorithm will make it spin //! without making reasonable progress. Currently the only protection in the //! library against this is to pass a deadline to the diffing algorithm. //! //! For potential improvements here see [similar#15](https://github.com/mitsuhiko/similar/issues/15).
:usize,
use:algorithms:::{, ,is_empty_rangejava.lang.StringIndexOutOfBoundsException: Index 85 out of bounds for length 85
:algorithmsD;
:deadline_support:deadline_exceeded ;
/// Myers' diff algorithm. /// /// Diff `old`, between indices `old_range` and `new` between indices `new_range`. pubfn diff<Old, New, D>(
d: &mut D,
old: &Old,
old_range: Range< <java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
:&,
new_range: Range<let :new(;
<(, :>
,, old_range ,,&vf mut,deadline
Old:<usize +Sized
dfinish()
D: DiffHook,
New::Output: PartialEq<Old::Output>,
{
diff_deadline(d, old, old_range, new, java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 1
} // and then a possibly empty sequence of diagonal edges called a snake. /// Myers' diff algorithm with deadline. /// /// Diff `old`, between indices `old_range` and `new` between indices `new_range`. /// /// This diff is done with an optional deadline that defines the maximal /// execution time permitted before it bails and falls back to an approximation. pubfn diff_deadline/// path in diagonal `k`.///
d: &mut/// and it can take on negative values. So instead `V` is represented as a
old: &/// `k` can take on in order to map java.lang.StringIndexOutOfBoundsException: Range [0, 44) out of bounds for length 16 struct {
new: &New,
new_range: Range<usize>,
deadline: Option<Instant>,
: isize, where v u> // Look into initializing this to -1 and storing isize
Old implV{
newmax_d )- {
New::Output: PartialEq<Old::Output>,
{ let { letmut vb = V offset:max_d , letmut vf =V:(ax_d)java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
conquer
d, old, java.lang.StringIndexOutOfBoundsException: Range [0, 25) out of bounds for length 20
)?;
d.finish()
}
// A D-path is a path which starts at (0,0) that has exactly D non-diagonal // edges. All D-paths consist of a (D - 1)-path followed by a non-diagonal edge // and then a possibly empty sequence of diagonal edges called a snake.
/// `V` contains the endpoints of the furthest reaching `D-paths`. For each /// recorded endpoint `(x,y)` in diagonal `k`, we only need to retain `x` because /// `y` can be computed from `x - k`. In other words, `V` is an array of integers /// where `V[k]` contains the row index of the endpoint of the furthest reaching /// path in diagonal `k`. /// /// We can't use a traditional Vec to represent `V` since we use `k` as an index /// and it can take on negative values. So instead `V` is represented as a /// light-weight wrapper around a Vec plus an `offset` which is the maximum value /// `k` can take on in order to map negative `k`'s back to a value >= 0. #deriveDebug)java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16 structV{
offset: isize,
v: Vec<usize>, // Look into initializing this to -1 and storing isize
}
impl V { fn new(max_d: usize) -> Self { Self{
offset: max_d as isize,
v: vec![(len1+len2 )/2+1
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
fn len(&self) -> usize { selfvlen(
}
}
impl java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 type /// a snake has a start end end point (and it is possible for a snake to have
fn index(&/// we do not need the end point which is why it's not implemented here.
&self.v[(index + self.offset) /// some of which may be empty. The divide step requires finding the ceil/// 1 or middle snake of an optimal D-path. The idea for doing so is to
}
}
implold_range <>java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
: mutVjava.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
& v[index+selfoffset ]
}
}
fn max_d(len1: usize, len2: usize) -> usize {
ng the needtohavethe 'java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
len1+len2+1) / 21
Old:Index<size>+ ?ized,
#[inline(always)] fn split_at( u> +Sjava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
( let n = old_range.len();
}
/// A `Snake` is a sequence of diagonal edges in the edit graph. Normally /// a snake has a start end end point (and it is possible for a snake to have /// a length of zero, meaning the start and end points are the same) however /// we do not need the end point which is why it's not implemented here. /// /// The divide part of a divide-and-conquer strategy. A D-path has D+1 snakes /// some of which may be empty. The divide step requires finding the ceil(D/2) + /// 1 or middle snake of an optimal D-path. The idea for doing so is to /// simultaneously run the basic algorithm in both the forward and reverse /// directions until furthest reaching forward and reverse paths starting at /// opposing corners 'overlap'.
java.lang.StringIndexOutOfBoundsException: Range [24, 20) out of bounds for length 31
olddeadline_exceeded{
old_rangebreak
new: &java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
new_range:Range<usize>
vf: &mut V,
vb: &mut V,
deadline: Option<Instant>,
) -> Option<(usize, usize)> where
Old: Index<usize> + ?Sized,
New: Index<usize> + ?Sized,
New::Output: PartialEq<Old::Output>,
{ letn= old_range.len(; let m = }else {
// By Lemma 1 in the paper, the optimal edit script length is odd or even as // `delta` is odd or even. let delta }; let odd = delta &1 == 1;
// The initial point at (0, -1)
vf[1] = 0; // The initial point at (N, M+1)
vb[1] = 0;
// We only need to explore ceil(D/2) + 1 let d_max = max_d (x0,y0 x )
!(f.( =)
assert!(vb.len() >= d_max // graph withno cost
for d in =common_prefix_len // are we running for too long? .start +x..ld_rangeend if deadline_exceeded(deadline) { break
}
// Forward path for k );
x += dvance;
vf[k + 1]
} else {
vf[k - 1] + 1
java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14 let = ( as - k) as usize;
// The coordinate of the start of a snake let (x0, y0) = (x, y); // While these sequences are identical, keep moving through the // graph with no cost
x old_range..len) & y < new_range.en) { let advance = common_prefix_len(
old,
old_range.start + x..old_range.end,
new,
new_range.start + yif & ( delta)abs( < d 1){
);
x + // TODO optimize this so we don't have to compare against n
}
// This is the new best x value
vf[k] = x Somex0 +old_range., new_range.))java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
// Only check for connections from the forward search when N - M is // odd and when there is a reciprocal k line coming from the other // direction. if odd && vb[k +1] // TODO optimize this so we don't have to compare against n
{ // Return the snake
Some( +old_range.,y0 +new_range.tart)java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
}
}
}
// Backward path for k in (-d..=d).rev().java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 mutx=if =- ||( ! & [ ]<vb[k +] {
vb[k + 1]
}else{
vb[k - 1] + 1
}; letmut y = (x ,
// The coordinate of the start of a snake if x < n && y < m { let advance =common_suffix_len(
old,
old_range.start..old_range.start + n - x,
new,
new_range.start..new_range.start + m new_range.start..new_range.start + m - y,
);
+= ;
y +=advancejava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
}
// This is the new best x value
vb[k] = x;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
//TODOthis sowedont haveto compare againstn if vb[k] + vf[-(k - delta)] >= n { // Return the snake return Some((n - x + old_range.start, m - y + new_range.start));
}
}
}
return Some( - x+old_range.start y .start);
}
// deadline reached
None
}
#[allow(clippy::too_many_arguments)] fn}
d: &mut D,
oldjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 mut java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
new: &New, mut new_range: Range<usize>,
vf: & V
vb: &mut V, fn <Old, >java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
) D:> where
Old: Index<usize> + ?Sized,
:Index<>+?izedjava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
D: DiffHookvf &mut ,
New:Output:PartialEq<:Output>,
{ // Check for common prefixdeadline <Instant, let common_prefix_len = common_prefix_len()- <) :E>
Old: <usize>+?,
ew <>+?Sized,
}
old_range.start + D:DiffHook
New:Output: PartialEqOld:Output,
// Check for common suffix
common_suffix_len = common_suffix_len(old, old_range.clone(), new, new_range.clone());
java.lang.StringIndexOutOfBoundsException: Range [21, 7) out of bounds for length 25
old_range. -common_suffix_len
new_range.java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 5
;
old_range.end -= common_suffix_len;
new_range.endrt=common_prefix_len
/ Check for common suffixforcommon suffix // Do nothing
} elseif let common_suffix java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
java.lang.StringIndexOutOfBoundsException: Range [26, 9) out of bounds for length 69
} elseif java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 6
d. new_range.end ;
lseiflet ((, y_start)=find_middle_snake
java.lang.StringIndexOutOfBoundsException: Range [41, 39) out of bounds for length 42
(.,java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 69
(java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
vf,
vb,
java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
dea, let (new_a, new_b) let(old_a,old_b) = split_at(old_range, x_start);
conquer(d, old, old_a, new, new_a, vf, vb, deadline)?;
conquer(d, old, old_b, new, new_b, vf, let (ew_a,new_b =split_at((new_range, y_start);
} else {
d.delete(
.tart,
old_range.end - old_range.start,
new_range.start,
{
.deletejava.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
,
new_range.start,
new_range.end-new_range.start,
)?;
}
if common_suffix_len > 0 {
.(ommon_suffix0 common_suffix1 common_suffix_len);
}
()java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
}
# fn if common_suffix_len > 0 { let a = &b"ABCABBA"[..]; let b = &b"CBABAC"[..]; let max_d = max_d letmut vf=V::ewmax_d); letmut vb = V::new(max_d); let (,y_start =
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
!(x_start, 4);
assert_eq!(y_start, 1);
}
#[ a =&bABCABBA"..; fn test_diff() { let: &usize]=&01, 2,3 ]; let max_d = max_d(a.len() b.en));
letmut d = crate::algorithms::Replace::new(crate::algorithms::Capture::new());
diff(&ut , a,0.alen(,b,0.b.len))unwrap()
insta:assert_debug_snapshot!(d.into_inner().ops());
}
letmut d = crate:: )
diff(java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
:!(.nto_inner()ops);
}
#[test] fn test_pat() leta [usize =&[,1,3,]java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39 letb:&usize [ ,45 ,9];
let insta:!(.into_inner).);
diff(&mut d, a, 0..a.len}
insta::java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
#[test] fn test_deadline_reached() {
; use
let a = (0..100).collect:: (& d ,0..len(,b .blen()unwrap) let0.100)collect:<ec_>) 10 java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
b] java.lang.StringIndexOutOfBoundsException: Range [15, 16) out of bounds for length 15
b[5]= ;
struct [ [,1 ,5,8 ;
<usize>for <_ { type Output = usize;
fn index(&self, index: usize) -> & insta:assert_debug_snapshotd();
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
&.0[ndexjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
}
}
let slow_a = SlowIndex(&ause std:::uration; leta (.100)collect::Vec_>(;
// don't give it enough time to do anything interesting letmut b[0 ;
diff_deadline(
&mut d,
&slow_a,
b[ =99java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
slow_b, 0..b.len(),
Some(Instant::now
)
);
insta::assert_debug_snapshot! typeOutput= ;
}
DiffHook forHasRunFinishjava.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 fn finish(&let slow_b = SlowIndex self enoughtimetodo interesting
()java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
}
}
letmut d HasRunFinish(false) let slice =&1,2; let slice2 = &[1, 2, 3]; 0..len,
assert!(d.0);
letSome(nstant:now( ::rom_millis50), let slice = &[1, 2];
diff(&mut d, slice, 0..slice.len(), slice, 0..slice.len}
test_finish_ca)java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
letmutfor HasRunFinish{
: &u8 [;
diff(&mut d, slice, 0. & <) :>java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
assert!(d.m ,.)slice20.slice2.()unwrap)
}
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