This commit is contained in:
Stephen Franceschelli 2019-07-30 13:41:05 -04:00
parent 596a6da241
commit c1a589c5b6
7078 changed files with 1882834 additions and 319 deletions

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/* eslint-disable no-nested-ternary */
'use strict';
var arr = [];
var charCodeCache = [];
module.exports = function (a, b) {
if (a === b) {
return 0;
}
var swap = a;
// Swapping the strings if `a` is longer than `b` so we know which one is the
// shortest & which one is the longest
if (a.length > b.length) {
a = b;
b = swap;
}
var aLen = a.length;
var bLen = b.length;
if (aLen === 0) {
return bLen;
}
if (bLen === 0) {
return aLen;
}
// Performing suffix trimming:
// We can linearly drop suffix common to both strings since they
// don't increase distance at all
// Note: `~-` is the bitwise way to perform a `- 1` operation
while (aLen > 0 && (a.charCodeAt(~-aLen) === b.charCodeAt(~-bLen))) {
aLen--;
bLen--;
}
if (aLen === 0) {
return bLen;
}
// Performing prefix trimming
// We can linearly drop prefix common to both strings since they
// don't increase distance at all
var start = 0;
while (start < aLen && (a.charCodeAt(start) === b.charCodeAt(start))) {
start++;
}
aLen -= start;
bLen -= start;
if (aLen === 0) {
return bLen;
}
var bCharCode;
var ret;
var tmp;
var tmp2;
var i = 0;
var j = 0;
while (i < aLen) {
charCodeCache[start + i] = a.charCodeAt(start + i);
arr[i] = ++i;
}
while (j < bLen) {
bCharCode = b.charCodeAt(start + j);
tmp = j++;
ret = j;
for (i = 0; i < aLen; i++) {
tmp2 = bCharCode === charCodeCache[start + i] ? tmp : tmp + 1;
tmp = arr[i];
ret = arr[i] = tmp > ret ? tmp2 > ret ? ret + 1 : tmp2 : tmp2 > tmp ? tmp + 1 : tmp2;
}
}
return ret;
};

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The MIT License (MIT)
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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{
"_from": "leven@^2.1.0",
"_id": "leven@2.1.0",
"_inBundle": false,
"_integrity": "sha1-wuep93IJTe6dNCAq6KzORoeHVYA=",
"_location": "/leven",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "leven@^2.1.0",
"name": "leven",
"escapedName": "leven",
"rawSpec": "^2.1.0",
"saveSpec": null,
"fetchSpec": "^2.1.0"
},
"_requiredBy": [
"/jest-validate"
],
"_resolved": "https://registry.npmjs.org/leven/-/leven-2.1.0.tgz",
"_shasum": "c2e7a9f772094dee9d34202ae8acce4687875580",
"_spec": "leven@^2.1.0",
"_where": "E:\\github\\setup-java\\node_modules\\jest-validate",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "sindresorhus.com"
},
"bugs": {
"url": "https://github.com/sindresorhus/leven/issues"
},
"bundleDependencies": false,
"deprecated": false,
"description": "Measure the difference between two strings using the fastest JS implementation of the Levenshtein distance algorithm",
"devDependencies": {
"ava": "^0.17.0",
"fast-levenshtein": "^2.0.5",
"ld": "^0.1.0",
"levdist": "^2.0.0",
"levenshtein": "^1.0.4",
"levenshtein-component": "0.0.1",
"levenshtein-edit-distance": "^2.0.0",
"matcha": "^0.7.0",
"natural": "^0.4.0",
"talisman": "^0.18.0",
"xo": "^0.16.0"
},
"engines": {
"node": ">=0.10.0"
},
"files": [
"index.js"
],
"homepage": "https://github.com/sindresorhus/leven#readme",
"keywords": [
"leven",
"levenshtein",
"distance",
"algorithm",
"algo",
"string",
"difference",
"diff",
"fast",
"fuzzy",
"similar",
"similarity",
"compare",
"comparison",
"edit",
"text",
"match",
"matching"
],
"license": "MIT",
"name": "leven",
"repository": {
"type": "git",
"url": "git+https://github.com/sindresorhus/leven.git"
},
"scripts": {
"bench": "matcha bench.js",
"test": "xo && ava"
},
"version": "2.1.0"
}

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# leven [![Build Status](https://travis-ci.org/sindresorhus/leven.svg?branch=master)](https://travis-ci.org/sindresorhus/leven)
> Measure the difference between two strings<br>
> The fastest JS implementation of the [Levenshtein distance](http://en.wikipedia.org/wiki/Levenshtein_distance) algorithm
## Install
```
$ npm install --save leven
```
## Usage
```js
const leven = require('leven');
leven('cat', 'cow');
//=> 2
```
## Benchmark
```
$ npm run bench
```
```
401,487 op/s » leven
371,707 op/s » talisman
264,191 op/s » levenshtein-edit-distance
152,923 op/s » fast-levenshtein
57,267 op/s » levenshtein-component
19,915 op/s » levdist
21,802 op/s » ld
18,079 op/s » natural
11,761 op/s » levenshtein
```
## Related
- [leven-cli](https://github.com/sindresorhus/leven-cli) - CLI for this module
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)