Clean up translator (#1505)
* Remove unused: _removeUsedDefinitions * Remove unused: _scoreToTermFrequency * Remove unused: _getTermTagsScoreSum * Add RegexUtil * Update Translator to use RegexUtil * Update sw.js * Update tests
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@ -208,6 +208,7 @@
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"ext/js/dom/simple-dom-parser.js",
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"ext/js/general/cache-map.js",
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"ext/js/general/object-property-accessor.js",
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"ext/js/general/regex-util.js",
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"ext/js/general/text-source-map.js",
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"ext/js/language/deinflector.js",
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"ext/js/language/dictionary-data-util.js",
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@ -39,6 +39,7 @@
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<script src="/js/dom/native-simple-dom-parser.js"></script>
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<script src="/js/general/cache-map.js"></script>
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<script src="/js/general/object-property-accessor.js"></script>
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<script src="/js/general/regex-util.js"></script>
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<script src="/js/general/text-source-map.js"></script>
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<script src="/js/language/deinflector.js"></script>
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<script src="/js/language/dictionary-data-util.js"></script>
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93
ext/js/general/regex-util.js
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93
ext/js/general/regex-util.js
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@ -0,0 +1,93 @@
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/*
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* Copyright (C) 2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/**
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* This class provides some general utility functions for regular expressions.
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*/
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class RegexUtil {
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/**
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* Applies string.replace using a regular expression and replacement string as arguments.
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* A source map of the changes is also maintained.
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* @param text A string of the text to replace.
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* @param sourceMap An instance of `TextSourceMap` which corresponds to `text`.
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* @param pattern A regular expression to use as the replacement.
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* @param replacement A replacement string that follows the format of the standard
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* JavaScript regular expression replacement string.
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* @return A new string with the pattern replacements applied and the source map updated.
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*/
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static applyTextReplacement(text, sourceMap, pattern, replacement) {
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const isGlobal = pattern.global;
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if (isGlobal) { pattern.lastIndex = 0; }
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for (let loop = true; loop; loop = isGlobal) {
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const match = pattern.exec(text);
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if (match === null) { break; }
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const matchText = match[0];
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const index = match.index;
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const actualReplacement = this.applyMatchReplacement(replacement, match);
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const actualReplacementLength = actualReplacement.length;
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const delta = actualReplacementLength - (matchText.length > 0 ? matchText.length : -1);
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text = `${text.substring(0, index)}${actualReplacement}${text.substring(index + matchText.length)}`;
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pattern.lastIndex += delta;
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if (actualReplacementLength > 0) {
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sourceMap.insert(index, ...(new Array(actualReplacementLength).fill(0)));
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sourceMap.combine(index - 1 + actualReplacementLength, matchText.length);
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} else {
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sourceMap.combine(index, matchText.length);
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}
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}
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return text;
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}
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/**
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* Applies the replacement string for a given regular expression match.
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* @param replacement The replacement string that follows the format of the standard
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* JavaScript regular expression replacement string.
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* @param match A match object returned from RegExp.match.
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* @return A new string with the pattern replacement applied.
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*/
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static applyMatchReplacement(replacement, match) {
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const pattern = this._matchReplacementPattern;
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pattern.lastIndex = 0;
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return replacement.replace(pattern, (g0, g1, g2) => {
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if (typeof g1 !== 'undefined') {
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const matchIndex = Number.parseInt(g1, 10);
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if (matchIndex >= 1 && matchIndex <= match.length) {
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return match[matchIndex];
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}
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} else if (typeof g2 !== 'undefined') {
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const {groups} = match;
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if (typeof groups === 'object' && groups !== null && Object.prototype.hasOwnProperty.call(groups, g2)) {
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return groups[g2];
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}
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} else {
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switch (g0) {
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case '$': return '$';
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case '&': return match[0];
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case '`': return replacement.substring(0, match.index);
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case '\'': return replacement.substring(match.index + g0.length);
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}
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}
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return g0;
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});
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}
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}
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// eslint-disable-next-line no-underscore-dangle
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RegexUtil._matchReplacementPattern = /\$(?:\$|&|`|'|(\d\d?)|<([^>]*)>)/g;
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@ -17,6 +17,7 @@
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/* global
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* Deinflector
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* RegexUtil
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* TextSourceMap
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*/
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@ -534,24 +535,6 @@ class Translator {
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);
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}
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_removeUsedDefinitions(definitions, termInfoMap, usedDefinitions) {
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for (let i = 0, ii = definitions.length; i < ii; ++i) {
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const definition = definitions[i];
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const {expression, reading} = definition;
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const expressionMap = termInfoMap.get(expression);
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if (
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typeof expressionMap !== 'undefined' &&
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typeof expressionMap.get(reading) !== 'undefined'
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) {
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usedDefinitions.add(definition);
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} else {
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definitions.splice(i, 1);
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--i;
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--ii;
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}
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}
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}
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_getUniqueDefinitionTags(definitions) {
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const definitionTagsMap = new Map();
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for (const {definitionTags} of definitions) {
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@ -794,16 +777,6 @@ class Translator {
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// Simple helpers
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_scoreToTermFrequency(score) {
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if (score > 0) {
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return 'popular';
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} else if (score < 0) {
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return 'rare';
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} else {
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return 'normal';
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}
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}
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_getNameBase(name) {
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const pos = name.indexOf(':');
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return (pos >= 0 ? name.substring(0, pos) : name);
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@ -974,14 +947,6 @@ class Translator {
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// Reduction functions
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_getTermTagsScoreSum(termTags) {
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let result = 0;
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for (const {score} of termTags) {
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result += score;
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}
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return result;
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}
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_getSourceTermMatchCountSum(definitions) {
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let result = 0;
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for (const {sourceTermExactMatchCount} of definitions) {
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@ -1408,59 +1373,8 @@ class Translator {
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_applyTextReplacements(text, sourceMap, replacements) {
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for (const {pattern, replacement} of replacements) {
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text = this._applyTextReplacement(text, sourceMap, pattern, replacement);
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text = RegexUtil.applyTextReplacement(text, sourceMap, pattern, replacement);
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}
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return text;
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}
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_applyTextReplacement(text, sourceMap, pattern, replacement) {
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const isGlobal = pattern.global;
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if (isGlobal) { pattern.lastIndex = 0; }
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for (let loop = true; loop; loop = isGlobal) {
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const match = pattern.exec(text);
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if (match === null) { break; }
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const matchText = match[0];
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const index = match.index;
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const actualReplacement = this._applyMatchReplacement(replacement, match);
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const actualReplacementLength = actualReplacement.length;
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const delta = actualReplacementLength - (matchText.length > 0 ? matchText.length : -1);
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text = `${text.substring(0, index)}${actualReplacement}${text.substring(index + matchText.length)}`;
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pattern.lastIndex += delta;
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if (actualReplacementLength > 0) {
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sourceMap.insert(index, ...(new Array(actualReplacementLength).fill(0)));
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sourceMap.combine(index - 1 + actualReplacementLength, matchText.length);
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} else {
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sourceMap.combine(index, matchText.length);
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}
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}
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return text;
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}
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_applyMatchReplacement(replacement, match) {
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const pattern = /\$(?:\$|&|`|'|(\d\d?)|<([^>]*)>)/g;
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return replacement.replace(pattern, (g0, g1, g2) => {
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if (typeof g1 !== 'undefined') {
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const matchIndex = Number.parseInt(g1, 10);
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if (matchIndex >= 1 && matchIndex <= match.length) {
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return match[matchIndex];
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}
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} else if (typeof g2 !== 'undefined') {
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const {groups} = match;
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if (typeof groups === 'object' && groups !== null && Object.prototype.hasOwnProperty.call(groups, g2)) {
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return groups[g2];
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}
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} else {
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switch (g0) {
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case '$': return '$';
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case '&': return match[0];
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case '`': return replacement.substring(0, match.index);
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case '\'': return replacement.substring(match.index + g0.length);
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}
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}
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return g0;
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});
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}
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}
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@ -36,6 +36,7 @@ self.importScripts(
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'/js/dom/simple-dom-parser.js',
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'/js/general/cache-map.js',
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'/js/general/object-property-accessor.js',
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'/js/general/regex-util.js',
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'/js/general/text-source-map.js',
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'/js/language/deinflector.js',
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'/js/language/dictionary-data-util.js',
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@ -44,6 +44,7 @@ async function createVM() {
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'js/language/dictionary-importer.js',
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'js/data/database.js',
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'js/language/dictionary-database.js',
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'js/general/regex-util.js',
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'js/general/text-source-map.js',
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'js/language/deinflector.js',
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'js/language/translator.js'
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