129 lines
3.6 KiB
Plaintext
129 lines
3.6 KiB
Plaintext
'use strict';
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var types = require('../../types.cjs');
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var index = require('../../scoring/index.cjs');
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/*
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*-------------------------------------------------------------------------------
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* repeats (aaa, abcabcabc) ------------------------------
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*-------------------------------------------------------------------------------
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*/
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class MatchRepeat extends types.MatcherBaseClass {
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constructor(options) {
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super(options);
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this.scoring = new index(options);
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}
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// eslint-disable-next-line max-statements
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match({
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password,
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omniMatch
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}) {
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const matches = [];
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let lastIndex = 0;
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while (lastIndex < password.length) {
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const greedyMatch = this.getGreedyMatch(password, lastIndex);
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const lazyMatch = this.getLazyMatch(password, lastIndex);
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if (greedyMatch == null) {
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break;
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}
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const {
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match,
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baseToken
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} = this.setMatchToken(greedyMatch, lazyMatch);
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if (match) {
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const j = match.index + match[0].length - 1;
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const baseGuesses = this.getBaseGuesses(baseToken, omniMatch);
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matches.push(this.normalizeMatch(baseToken, j, match, baseGuesses));
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lastIndex = j + 1;
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}
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}
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const hasPromises = matches.some(match => {
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return match instanceof Promise;
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});
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if (hasPromises) {
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// eslint-disable-next-line @typescript-eslint/await-thenable
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return Promise.all(matches);
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}
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return matches;
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}
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// eslint-disable-next-line max-params
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normalizeMatch(baseToken, j, match, baseGuesses) {
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const baseMatch = {
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pattern: 'repeat',
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i: match.index,
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j,
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token: match[0],
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baseToken,
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baseGuesses: 0,
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repeatCount: match[0].length / baseToken.length
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};
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if (baseGuesses instanceof Promise) {
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return baseGuesses.then(resolvedBaseGuesses => {
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return {
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...baseMatch,
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baseGuesses: resolvedBaseGuesses
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};
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});
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}
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return {
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...baseMatch,
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baseGuesses
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};
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}
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getGreedyMatch(password, lastIndex) {
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const greedy = /(.+)\1+/g;
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greedy.lastIndex = lastIndex;
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return greedy.exec(password);
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}
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getLazyMatch(password, lastIndex) {
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const lazy = /(.+?)\1+/g;
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lazy.lastIndex = lastIndex;
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return lazy.exec(password);
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}
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setMatchToken(greedyMatch, lazyMatch) {
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const lazyAnchored = /^(.+?)\1+$/;
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let match;
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let baseToken = '';
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if (lazyMatch && greedyMatch[0].length > lazyMatch[0].length) {
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// greedy beats lazy for 'aabaab'
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// greedy: [aabaab, aab]
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// lazy: [aa, a]
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match = greedyMatch;
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// greedy's repeated string might itself be repeated, eg.
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// aabaab in aabaabaabaab.
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// run an anchored lazy match on greedy's repeated string
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// to find the shortest repeated string
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const temp = lazyAnchored.exec(match[0]);
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if (temp) {
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baseToken = temp[1];
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}
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} else {
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// lazy beats greedy for 'aaaaa'
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// greedy: [aaaa, aa]
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// lazy: [aaaaa, a]
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match = lazyMatch;
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if (match) {
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baseToken = match[1];
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}
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}
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return {
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match,
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baseToken
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};
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}
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getBaseGuesses(baseToken, omniMatch) {
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const matches = omniMatch.match(baseToken);
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if (matches instanceof Promise) {
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return matches.then(resolvedMatches => {
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const baseAnalysis = this.scoring.mostGuessableMatchSequence(baseToken, resolvedMatches);
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return baseAnalysis.guesses;
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});
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}
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const baseAnalysis = this.scoring.mostGuessableMatchSequence(baseToken, matches);
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return baseAnalysis.guesses;
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}
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}
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module.exports = MatchRepeat;
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//# sourceMappingURL=matching.cjs.map
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