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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Diffing_with_keys (ocaml.Diffing_with_keys)</title><link rel="stylesheet" href="../../_odoc-theme/odoc.css"/><meta charset="utf-8"/><meta name="generator" content="odoc 2.2.1"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../index.html">ocaml</a> &#x00BB; Diffing_with_keys</nav><header class="odoc-preamble"><h1>Module <code><span>Diffing_with_keys</span></code></h1><p>When diffing lists where each element has a distinct key, we can refine the diffing patch by introducing two composite edit moves: swaps and moves.</p><p><code>Swap</code>s exchange the position of two elements. <code>Swap</code> cost is set to <code>2 * change - epsilon</code>. <code>Move</code>s change the position of one element. <code>Move</code> cost is set to <code>delete + addition - epsilon</code>.</p><p>When the cost <code>delete + addition</code> is greater than <code>change</code> and with those specific weights, the optimal patch with <code>Swap</code>s and <code>Move</code>s can be computed directly and cheaply from the original optimal patch.</p></header><div class="odoc-content"><div class="odoc-spec"><div class="spec type anchored" id="type-with_pos"><a href="#type-with_pos" class="anchor"></a><code><span><span class="keyword">type</span> <span>'a with_pos</span></span><span> = </span><span>{</span></code><ol><li id="type-with_pos.pos" class="def record field anchored"><a href="#type-with_pos.pos" class="anchor"></a><code><span>pos : int;</span></code></li><li id="type-with_pos.data" class="def record field anchored"><a href="#type-with_pos.data" class="anchor"></a><code><span>data : <span class="type-var">'a</span>;</span></code></li></ol><code><span>}</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-with_pos"><a href="#val-with_pos" class="anchor"></a><code><span><span class="keyword">val</span> with_pos : <span><span><span class="type-var">'a</span> list</span> <span class="arrow">&#45;&gt;</span></span> <span><span><span class="type-var">'a</span> <a href="#type-with_pos">with_pos</a></span> list</span></span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-mismatch"><a href="#type-mismatch" class="anchor"></a><code><span><span class="keyword">type</span> <span>('l, 'r, 'diff) mismatch</span></span><span> = </span></code><ol><li id="type-mismatch.Name" class="def variant constructor anchored"><a href="#type-mismatch.Name" class="anchor"></a><code><span>| </span><span><span class="constructor">Name</span> <span class="keyword">of</span> </span><span>{</span></code><ol><li id="type-mismatch.pos" class="def record field anchored"><a href="#type-mismatch.pos" class="anchor"></a><code><span>pos : int;</span></code></li><li id="type-mismatch.got" class="def record field anchored"><a href="#type-mismatch.got" class="anchor"></a><code><span>got : string;</span></code></li><li id="type-mismatch.expected" class="def record field anchored"><a href="#type-mismatch.expected" class="anchor"></a><code><span>expected : string;</span></code></li><li id="type-mismatch.types_match" class="def record field anchored"><a href="#type-mismatch.types_match" class="anchor"></a><code><span>types_match : bool;</span></code></li></ol><code><span>}</span></code></li><li id="type-mismatch.Type" class="def variant constructor anchored"><a href="#type-mismatch.Type" class="anchor"></a><code><span>| </span><span><span class="constructor">Type</span> <span class="keyword">of</span> </span><span>{</span></code><ol><li id="type-mismatch.pos" class="def record field anchored"><a href="#type-mismatch.pos" class="anchor"></a><code><span>pos : int;</span></code></li><li id="type-mismatch.got" class="def record field anchored"><a href="#type-mismatch.got" class="anchor"></a><code><span>got : <span class="type-var">'l</span>;</span></code></li><li id="type-mismatch.expected" class="def record field anchored"><a href="#type-mismatch.expected" class="anchor"></a><code><span>expected : <span class="type-var">'r</span>;</span></code></li><li id="type-mismatch.reason" class="def record field anchored"><a href="#type-mismatch.reason" class="anchor"></a><code><span>reason : <span class="type-var">'diff</span>;</span></code></li></ol><code><span>}</span></code></li></ol></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-change"><a href="#type-change" class="anchor"></a><code><span><span class="keyword">type</span> <span>('l, 'r, 'diff) change</span></span><span> = </span></code><ol><li id="type-change.Change" class="def variant constructor anchored"><a href="#type-change.Change" class="anchor"></a><code><span>| </span><span><span class="constructor">Change</span> <span class="keyword">of</span> <span><span>(<span class="type-var">'l</span>, <span class="type-var">'r</span>, <span class="type-var">'diff</span>)</span> <a href="#type-mismatch">mismatch</a></span></span></code></li><li id="type-change.Swap" class="def variant constructor anchored"><a href="#type-change.Swap" class="anchor"></a><code><span>| </span><span><span class="constructor">Swap</span> <span class="keyword">of</span> </span><span>{</span></code><ol><li id="type-change.pos" class="def record field anchored"><a href="#type-change.pos" class="anchor"></a><code><span>pos : int * int;</span></code></li><li id="type-change.first" class="def record field anchored"><a href="#type-change.first" class="anchor"></a><code><span>first : string;</span></code></li><li id="type-change.last" class="def record field anchored"><a href="#type-change.last" class="anchor"></a><code><span>last : string;</span></code></li></ol><code><span>}</span></code></li><li id="type-change.Move" class="def variant constructor anchored"><a href="#type-change.Move" class="anchor"></a><code><span>| </span><span><span class="constructor">Move</span> <span class="keyword">of</span> </span><span>{</span></code><ol><li id="type-change.name" class="def record field anchored"><a href="#type-change.name" class="anchor"></a><code><span>name : string;</span></code></li><li id="type-change.got" class="def record field anchored"><a href="#type-change.got" class="anchor"></a><code><span>got : int;</span></code></li><li id="type-change.expected" class="def record field anchored"><a href="#type-change.expected" class="anchor"></a><code><span>expected : int;</span></code></li></ol><code><span>}</span></code></li><li id="type-change.Insert" class="def variant constructor anchored"><a href="#type-change.Insert" class="anchor"></a><code><span>| </span><span><span class="constructor">Insert</span> <span class="keyword">of</span> </span><span>{</span></code><ol><li id="type-change.pos" class="def record field anchored"><a href="#type-change.pos" class="anchor"></a><code><span>pos : int;</span></code></li><li id="type-change.insert" class="def record field anchored"><a href="#type-change.insert" class="anchor"></a><code><span>insert : <span class="type-var">'r</span>;</span></code></li></ol><code><span>}</span></code></li><li id="type-change.Delete" class="def variant constructor anchored"><a href="#type-change.Delete" class="anchor"></a><code><span>| </span><span><span class="constructor">Delete</span> <span class="keyword">of</span> </span><span>{</span></code><ol><li id="type-change.pos" class="def record field anchored"><a href="#type-change.pos" class="anchor"></a><code><span>pos : int;</span></code></li><li id="type-change.delete" class="def record field anchored"><a href="#type-change.delete" class="anchor"></a><code><span>delete : <span class="type-var">'l</span>;</span></code></li></ol><code><span>}</span></code></li></ol></div><div class="spec-doc"><p>This specialized version of changes introduces two composite changes: <code>Move</code> and <code>Swap</code></p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-prefix"><a href="#val-prefix" class="anchor"></a><code><span><span class="keyword">val</span> prefix : <span><a href="../Stdlib/Format/index.html#type-formatter">Stdlib.Format.formatter</a> <span class="arrow">&#45;&gt;</span></span> <span><span><span>(<span class="type-var">'l</span>, <span class="type-var">'r</span>, <span class="type-var">'diff</span>)</span> <a href="#type-change">change</a></span> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-Define"><a href="#module-Define" class="anchor"></a><code><span><span class="keyword">module</span> <a href="Define/index.html">Define</a></span><span> (<a href="Define/argument-1-D/index.html">D</a> : <a href="../Diffing/module-type-Defs/index.html">Diffing.Defs</a> <span class="keyword">with</span> <span><span class="keyword">type</span> <a href="../Diffing/module-type-Defs/index.html#type-eq">eq</a> := unit</span>) : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div></div></body></html>
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