github.com/yrj2011/jx-test-infra@v0.0.0-20190529031832-7a2065ee98eb/prow/cmd/deck/static/fuzzy-search.js (about) 1 /* 2 Copyright 2018 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 (function(window) { 18 var FuzzySearch = function(dict) { 19 dict.sort(); 20 /** {Array<string>} **/ 21 this.dict = dict; 22 /** 23 * Returns true if the string contains all the pattern characters. 24 * @param {string} pttn 25 * @param {string} str 26 * @return {boolean} 27 */ 28 this.basicMatch = function(pttn, str) { 29 var i = 0, j = 0; 30 while (i < pttn.length && j < str.length) { 31 if (pttn[i].toLowerCase() === str[j].toLowerCase()) i += 1; 32 j += 1; 33 } 34 return i === pttn.length; 35 }; 36 37 /** 38 * Sorts dict function. The higher the score, the lower index the string is. If two 39 * strings have the same score, sort by alphabetical order. 40 * @param {string} a 41 * @param {string} b 42 * @return {number} 43 */ 44 this.sortFn = function(a, b) { 45 if (a.score === b.score) { 46 return a.str < b.str ? -1 : (a.str > b.str ? 1 : 0); 47 } 48 return a.score > b.score ? -1 : 1; 49 }; 50 51 /** 52 * Calculates the score that a matching can get. The string is calculated based on 4 53 * criteria: 54 * 1. +3 score for the matching that occurs near the beginning of the string. 55 * 2. +5 score for the matching that is not an alphabetical character. 56 * 3. +3 score for the matching that the string character is upper case. 57 * 4. +10 score for the matching that matches the uppercase which is just before a 58 * separator. 59 * @param {number} i 60 * @param {string} str 61 * @return {number} 62 */ 63 this.calcScore = function(i, str) { 64 var score = 0; 65 var isAlphabetical = function (c) { 66 return (c > 64 && c < 91) || (c > 96 && c < 123); 67 }; 68 // Bonus if the matching is near the start of the string 69 if (i < 3) { 70 score += 3; 71 } 72 // Bonus if the matching is not a alphabetical character 73 if (!isAlphabetical(str.charCodeAt(i))) { 74 score += 5; 75 } 76 // Bonus if the matching is an UpperCase character 77 if (str[i].toUpperCase() === str[i]) { 78 score += 3; 79 } 80 81 // Bonus if matching after a separator 82 var separatorBehind = (i === 0 || !isAlphabetical(str.charCodeAt(i - 1))); 83 if (separatorBehind && isAlphabetical(str.charCodeAt(i))) { 84 score += 10; 85 score += (str[i].toUpperCase() === str[i] ? 5 : 0); 86 } 87 return score; 88 }; 89 90 /** 91 * Get maximum score that a string can get against the pattern. 92 * @param {string} pttn 93 * @param {string} str 94 * @return {number} 95 */ 96 this.getMaxScore = function(pttn, str) { 97 // Rewards perfect match a value of Number.MAX_SAFE_INTEGER 98 if (pttn === str) { 99 return Number.MAX_SAFE_INTEGER; 100 } 101 var i = 0; 102 while (i < Math.min(pttn.length, str.length) && pttn[i] === str[i]) { 103 i++; 104 } 105 var streak = i; 106 var score = []; 107 for (i = 0; i < 2; i++) { 108 score[i] = []; 109 for (var j = 0 ; j < str.length; j++) { 110 score[i][j] = 0; 111 } 112 } 113 for (i = 0; i < pttn.length; i++) { 114 var t = i % 2; 115 for (j = 0; j < str.length; j++) { 116 var scoreVal = pttn[i].toLowerCase() === str[j].toLowerCase() ? 117 this.calcScore(j, str) : Number.MIN_SAFE_INTEGER; 118 if (streak > 4 && i === streak - 1 && j === streak - 1) { 119 scoreVal += 10 * streak; 120 } 121 if (i === 0) { 122 score[t][j] = scoreVal; 123 if (j > 0) score[t][j] = Math.max(score[t][j], score[t][j-1]); 124 } else { 125 if (j > 0) { 126 score[t][j] = Math.max(score[t][j], score[t][j-1]); 127 score[t][j] = Math.max(score[t][j], score[Math.abs(t-1)][j-1] + scoreVal); 128 } 129 } 130 } 131 } 132 return score[(pttn.length - 1) % 2][str.length - 1]; 133 }; 134 }; 135 136 /** 137 * Returns a list of string from dictionary that matches against the pattern. 138 * @param {string} pattern 139 * @return {Array<string>} 140 */ 141 FuzzySearch.prototype.search = function(pattern) { 142 if (!this.dict || !this.dict.length === 0) { 143 return []; 144 } 145 if (!pattern || pattern.length === 0) { 146 return this.dict; 147 } 148 var dictScr = []; 149 for (var i = 0; i < this.dict.length; i++) { 150 if (this.basicMatch(pattern, this.dict[i])) { 151 dictScr.push({ 152 str: this.dict[i], 153 score: this.getMaxScore(pattern, this.dict[i]) 154 }); 155 } 156 } 157 dictScr.sort(this.sortFn); 158 159 var result = []; 160 for (i = 0; i < dictScr.length; i++) { 161 if (dictScr[i].score === 0) continue; 162 result.push(dictScr[i].str); 163 } 164 return result; 165 }; 166 167 /** 168 * Sets the dictionary for the fuzzy search. 169 * @param {Array<string>} dict 170 */ 171 FuzzySearch.prototype.setDict = function(dict) { 172 dict.sort(); 173 this.dict = dict; 174 }; 175 176 window.FuzzySearch = FuzzySearch; 177 })(window);