diff options
Diffstat (limited to 'node_modules/locutus/php/strings/similar_text.js')
-rw-r--r-- | node_modules/locutus/php/strings/similar_text.js | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/node_modules/locutus/php/strings/similar_text.js b/node_modules/locutus/php/strings/similar_text.js new file mode 100644 index 0000000..964182b --- /dev/null +++ b/node_modules/locutus/php/strings/similar_text.js @@ -0,0 +1,63 @@ +'use strict'; + +module.exports = function similar_text(first, second, percent) { + // eslint-disable-line camelcase + // discuss at: http://locutus.io/php/similar_text/ + // original by: RafaĆ Kukawski (http://blog.kukawski.pl) + // bugfixed by: Chris McMacken + // bugfixed by: Jarkko Rantavuori original by findings in stackoverflow (http://stackoverflow.com/questions/14136349/how-does-similar-text-work) + // improved by: Markus Padourek (taken from http://www.kevinhq.com/2012/06/php-similartext-function-in-javascript_16.html) + // example 1: similar_text('Hello World!', 'Hello locutus!') + // returns 1: 8 + // example 2: similar_text('Hello World!', null) + // returns 2: 0 + + if (first === null || second === null || typeof first === 'undefined' || typeof second === 'undefined') { + return 0; + } + + first += ''; + second += ''; + + var pos1 = 0; + var pos2 = 0; + var max = 0; + var firstLength = first.length; + var secondLength = second.length; + var p; + var q; + var l; + var sum; + + for (p = 0; p < firstLength; p++) { + for (q = 0; q < secondLength; q++) { + for (l = 0; p + l < firstLength && q + l < secondLength && first.charAt(p + l) === second.charAt(q + l); l++) {// eslint-disable-line max-len + // @todo: ^-- break up this crazy for loop and put the logic in its body + } + if (l > max) { + max = l; + pos1 = p; + pos2 = q; + } + } + } + + sum = max; + + if (sum) { + if (pos1 && pos2) { + sum += similar_text(first.substr(0, pos1), second.substr(0, pos2)); + } + + if (pos1 + max < firstLength && pos2 + max < secondLength) { + sum += similar_text(first.substr(pos1 + max, firstLength - pos1 - max), second.substr(pos2 + max, secondLength - pos2 - max)); + } + } + + if (!percent) { + return sum; + } + + return sum * 200 / (firstLength + secondLength); +}; +//# sourceMappingURL=similar_text.js.map
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