Merge pull request #362 from toasted-nutbread/more-type-refactoring

More type refactoring

7 files changed, 201 insertions, 197 deletions

diff --git a/ext/bg/js/audio.js b/ext/bg/js/audio.js
index 6389528b..0ecfd5c4 100644
--- a/ext/bg/js/audio.js
+++ b/ext/bg/js/audio.js
@@ -168,10 +168,8 @@ async function audioInject(definition, fields, sources, optionsContext) {
     }
 
     try {
-        let audioSourceDefinition = definition;
-        if (hasOwn(definition, 'expressions')) {
-            audioSourceDefinition = definition.expressions[0];
-        }
+        const expressions = definition.expressions;
+        const audioSourceDefinition = Array.isArray(expressions) ? expressions[0] : definition;
 
         const {url} = await audioGetFromSources(audioSourceDefinition, sources, optionsContext, true);
         if (url !== null) {
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index a4d085e0..16dffc85 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -319,7 +319,8 @@ class Backend {
 
     async _onApiTermsFind({text, details, optionsContext}) {
         const options = await this.getOptions(optionsContext);
-        const [definitions, length] = await this.translator.findTerms(text, details, options);
+        const mode = options.general.resultOutputMode;
+        const [definitions, length] = await this.translator.findTerms(mode, text, details, options);
         definitions.splice(options.general.maxResults);
         return {length, definitions};
     }
@@ -329,9 +330,9 @@ class Backend {
         const results = [];
         while (text.length > 0) {
             const term = [];
-            const [definitions, sourceLength] = await this.translator.findTermsInternal(
+            const [definitions, sourceLength] = await this.translator.findTerms(
+                'simple',
                 text.substring(0, options.scanning.length),
-                dictEnabledSet(options),
                 {},
                 options
             );
diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index 453cf15f..1f6810cf 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -149,15 +149,15 @@ class Database {
         await Promise.all(promises);
     }
 
-    async findTermsBulk(termList, titles, wildcard) {
+    async findTermsBulk(termList, dictionaries, wildcard) {
         this._validate();
 
         const promises = [];
-        const visited = {};
+        const visited = new Set();
         const results = [];
         const processRow = (row, index) => {
-            if (titles.includes(row.dictionary) && !hasOwn(visited, row.id)) {
-                visited[row.id] = true;
+            if (dictionaries.has(row.dictionary) && !visited.has(row.id)) {
+                visited.add(row.id);
                 results.push(Database._createTerm(row, index));
             }
         };
@@ -184,13 +184,13 @@ class Database {
         return results;
     }
 
-    async findTermsExactBulk(termList, readingList, titles) {
+    async findTermsExactBulk(termList, readingList, dictionaries) {
         this._validate();
 
         const promises = [];
         const results = [];
         const processRow = (row, index) => {
-            if (row.reading === readingList[index] && titles.includes(row.dictionary)) {
+            if (row.reading === readingList[index] && dictionaries.has(row.dictionary)) {
                 results.push(Database._createTerm(row, index));
             }
         };
@@ -234,16 +234,16 @@ class Database {
         return results;
     }
 
-    async findTermMetaBulk(termList, titles) {
-        return this._findGenericBulk('termMeta', 'expression', termList, titles, Database._createTermMeta);
+    async findTermMetaBulk(termList, dictionaries) {
+        return this._findGenericBulk('termMeta', 'expression', termList, dictionaries, Database._createTermMeta);
     }
 
-    async findKanjiBulk(kanjiList, titles) {
-        return this._findGenericBulk('kanji', 'character', kanjiList, titles, Database._createKanji);
+    async findKanjiBulk(kanjiList, dictionaries) {
+        return this._findGenericBulk('kanji', 'character', kanjiList, dictionaries, Database._createKanji);
     }
 
-    async findKanjiMetaBulk(kanjiList, titles) {
-        return this._findGenericBulk('kanjiMeta', 'character', kanjiList, titles, Database._createKanjiMeta);
+    async findKanjiMetaBulk(kanjiList, dictionaries) {
+        return this._findGenericBulk('kanjiMeta', 'character', kanjiList, dictionaries, Database._createKanjiMeta);
     }
 
     async findTagForTitle(name, title) {
@@ -572,13 +572,13 @@ class Database {
         return count > 0;
     }
 
-    async _findGenericBulk(tableName, indexName, indexValueList, titles, createResult) {
+    async _findGenericBulk(tableName, indexName, indexValueList, dictionaries, createResult) {
         this._validate();
 
         const promises = [];
         const results = [];
         const processRow = (row, index) => {
-            if (titles.includes(row.dictionary)) {
+            if (dictionaries.has(row.dictionary)) {
                 results.push(createResult(row, index));
             }
         };
diff --git a/ext/bg/js/dictionary.js b/ext/bg/js/dictionary.js
index 491632a0..f5c5b21b 100644
--- a/ext/bg/js/dictionary.js
+++ b/ext/bg/js/dictionary.js
@@ -16,18 +16,21 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-/*global utilSetEqual, utilSetIntersection, apiTemplateRender*/
+/*global apiTemplateRender*/
 
 function dictEnabledSet(options) {
-    const dictionaries = {};
-    for (const title in options.dictionaries) {
-        const dictionary = options.dictionaries[title];
-        if (dictionary.enabled) {
-            dictionaries[title] = dictionary;
-        }
+    const enabledDictionaryMap = new Map();
+    const optionsDictionaries = options.dictionaries;
+    for (const title in optionsDictionaries) {
+        if (!hasOwn(optionsDictionaries, title)) { continue; }
+        const dictionary = optionsDictionaries[title];
+        if (!dictionary.enabled) { continue; }
+        enabledDictionaryMap.set(title, {
+            priority: dictionary.priority || 0,
+            allowSecondarySearches: !!dictionary.allowSecondarySearches
+        });
     }
-
-    return dictionaries;
+    return enabledDictionaryMap;
 }
 
 function dictConfigured(options) {
@@ -40,28 +43,15 @@ function dictConfigured(options) {
     return false;
 }
 
-function dictRowsSort(rows, options) {
-    return rows.sort((ra, rb) => {
-        const pa = (options.dictionaries[ra.title] || {}).priority || 0;
-        const pb = (options.dictionaries[rb.title] || {}).priority || 0;
-        if (pa > pb) {
-            return -1;
-        } else if (pa < pb) {
-            return 1;
-        } else {
-            return 0;
-        }
-    });
-}
-
 function dictTermsSort(definitions, dictionaries=null) {
     return definitions.sort((v1, v2) => {
         let i;
         if (dictionaries !== null) {
-            i = (
-                ((dictionaries[v2.dictionary] || {}).priority || 0) -
-                ((dictionaries[v1.dictionary] || {}).priority || 0)
-            );
+            const dictionaryInfo1 = dictionaries.get(v1.dictionary);
+            const dictionaryInfo2 = dictionaries.get(v2.dictionary);
+            const priority1 = typeof dictionaryInfo1 !== 'undefined' ? dictionaryInfo1.priority : 0;
+            const priority2 = typeof dictionaryInfo2 !== 'undefined' ? dictionaryInfo2.priority : 0;
+            i = priority2 - priority1;
             if (i !== 0) { return i; }
         }
 
@@ -79,20 +69,16 @@ function dictTermsSort(definitions, dictionaries=null) {
 }
 
 function dictTermsUndupe(definitions) {
-    const definitionGroups = {};
+    const definitionGroups = new Map();
     for (const definition of definitions) {
-        const definitionExisting = definitionGroups[definition.id];
-        if (!hasOwn(definitionGroups, definition.id) || definition.expression.length > definitionExisting.expression.length) {
-            definitionGroups[definition.id] = definition;
+        const id = definition.id;
+        const definitionExisting = definitionGroups.get(id);
+        if (typeof definitionExisting === 'undefined' || definition.expression.length > definitionExisting.expression.length) {
+            definitionGroups.set(id, definition);
         }
     }
 
-    const definitionsUnique = [];
-    for (const key in definitionGroups) {
-        definitionsUnique.push(definitionGroups[key]);
-    }
-
-    return definitionsUnique;
+    return [...definitionGroups.values()];
 }
 
 function dictTermsCompressTags(definitions) {
@@ -123,35 +109,35 @@ function dictTermsCompressTags(definitions) {
 }
 
 function dictTermsGroup(definitions, dictionaries) {
-    const groups = {};
+    const groups = new Map();
     for (const definition of definitions) {
-        const key = [definition.source, definition.expression];
-        key.push(...definition.reasons);
+        const key = [definition.source, definition.expression, ...definition.reasons];
         if (definition.reading) {
             key.push(definition.reading);
         }
 
         const keyString = key.toString();
-        if (hasOwn(groups, keyString)) {
-            groups[keyString].push(definition);
-        } else {
-            groups[keyString] = [definition];
+        let groupDefinitions = groups.get(keyString);
+        if (typeof groupDefinitions === 'undefined') {
+            groupDefinitions = [];
+            groups.set(keyString, groupDefinitions);
         }
+
+        groupDefinitions.push(definition);
     }
 
     const results = [];
-    for (const key in groups) {
-        const groupDefs = groups[key];
-        const firstDef = groupDefs[0];
-        dictTermsSort(groupDefs, dictionaries);
+    for (const groupDefinitions of groups.values()) {
+        const firstDef = groupDefinitions[0];
+        dictTermsSort(groupDefinitions, dictionaries);
         results.push({
-            definitions: groupDefs,
+            definitions: groupDefinitions,
             expression: firstDef.expression,
             reading: firstDef.reading,
             furiganaSegments: firstDef.furiganaSegments,
             reasons: firstDef.reasons,
             termTags: firstDef.termTags,
-            score: groupDefs.reduce((p, v) => v.score > p ? v.score : p, Number.MIN_SAFE_INTEGER),
+            score: groupDefinitions.reduce((p, v) => v.score > p ? v.score : p, Number.MIN_SAFE_INTEGER),
             source: firstDef.source
         });
     }
@@ -159,6 +145,30 @@ function dictTermsGroup(definitions, dictionaries) {
     return dictTermsSort(results);
 }
 
+function dictAreSetsEqual(set1, set2) {
+    if (set1.size !== set2.size) {
+        return false;
+    }
+
+    for (const value of set1) {
+        if (!set2.has(value)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+function dictGetSetIntersection(set1, set2) {
+    const result = [];
+    for (const value of set1) {
+        if (set2.has(value)) {
+            result.push(value);
+        }
+    }
+    return result;
+}
+
 function dictTermsMergeBySequence(definitions, mainDictionary) {
     const sequencedDefinitions = new Map();
     const nonSequencedDefinitions = [];
@@ -189,89 +199,103 @@ function dictTermsMergeBySequence(definitions, mainDictionary) {
     return [sequencedDefinitions, nonSequencedDefinitions];
 }
 
-function dictTermsMergeByGloss(result, definitions, appendTo, mergedIndices) {
-    const definitionsByGloss = appendTo || {};
-    for (const [index, definition] of definitions.entries()) {
-        if (appendTo) {
-            let match = false;
-            for (const expression of result.expressions.keys()) {
-                if (definition.expression === expression) {
-                    for (const reading of result.expressions.get(expression).keys()) {
-                        if (definition.reading === reading) {
-                            match = true;
-                            break;
-                        }
-                    }
-                }
-                if (match) {
-                    break;
-                }
-            }
+function dictTermsMergeByGloss(result, definitions, appendTo=null, mergedIndices=null) {
+    const definitionsByGloss = appendTo !== null ? appendTo : new Map();
 
-            if (!match) {
-                continue;
-            } else if (mergedIndices) {
+    const resultExpressionsMap = result.expressions;
+    const resultExpressionSet = result.expression;
+    const resultReadingSet = result.reading;
+    const resultSource = result.source;
+
+    for (const [index, definition] of definitions.entries()) {
+        const {expression, reading} = definition;
+
+        if (mergedIndices !== null) {
+            const expressionMap = resultExpressionsMap.get(expression);
+            if (
+                typeof expressionMap !== 'undefined' &&
+                typeof expressionMap.get(reading) !== 'undefined'
+            ) {
                 mergedIndices.add(index);
+            } else {
+                continue;
             }
         }
 
         const gloss = JSON.stringify(definition.glossary.concat(definition.dictionary));
-        if (!definitionsByGloss[gloss]) {
-            definitionsByGloss[gloss] = {
+        let glossDefinition = definitionsByGloss.get(gloss);
+        if (typeof glossDefinition === 'undefined') {
+            glossDefinition = {
                 expression: new Set(),
                 reading: new Set(),
                 definitionTags: [],
                 glossary: definition.glossary,
-                source: result.source,
+                source: resultSource,
                 reasons: [],
                 score: definition.score,
                 id: definition.id,
                 dictionary: definition.dictionary
             };
+            definitionsByGloss.set(gloss, glossDefinition);
         }
 
-        definitionsByGloss[gloss].expression.add(definition.expression);
-        definitionsByGloss[gloss].reading.add(definition.reading);
+        glossDefinition.expression.add(expression);
+        glossDefinition.reading.add(reading);
 
-        result.expression.add(definition.expression);
-        result.reading.add(definition.reading);
+        resultExpressionSet.add(expression);
+        resultReadingSet.add(reading);
 
         for (const tag of definition.definitionTags) {
-            if (!definitionsByGloss[gloss].definitionTags.find((existingTag) => existingTag.name === tag.name)) {
-                definitionsByGloss[gloss].definitionTags.push(tag);
+            if (!glossDefinition.definitionTags.find((existingTag) => existingTag.name === tag.name)) {
+                glossDefinition.definitionTags.push(tag);
             }
         }
 
-        if (!appendTo) {
-            // result->expressions[ Expression1[ Reading1[ Tag1, Tag2 ] ], Expression2, ... ]
-            if (!result.expressions.has(definition.expression)) {
-                result.expressions.set(definition.expression, new Map());
+        if (appendTo === null) {
+            /*
+                Data layout:
+                resultExpressionsMap = new Map([
+                    [expression, new Map([
+                        [reading, new Map([
+                            [tagName, tagInfo],
+                            ...
+                        ])],
+                        ...
+                    ])],
+                    ...
+                ]);
+            */
+            let readingMap = resultExpressionsMap.get(expression);
+            if (typeof readingMap === 'undefined') {
+                readingMap = new Map();
+                resultExpressionsMap.set(expression, readingMap);
             }
-            if (!result.expressions.get(definition.expression).has(definition.reading)) {
-                result.expressions.get(definition.expression).set(definition.reading, []);
+
+            let termTagsMap = readingMap.get(reading);
+            if (typeof termTagsMap === 'undefined') {
+                termTagsMap = new Map();
+                readingMap.set(reading, termTagsMap);
             }
 
             for (const tag of definition.termTags) {
-                if (!result.expressions.get(definition.expression).get(definition.reading).find((existingTag) => existingTag.name === tag.name)) {
-                    result.expressions.get(definition.expression).get(definition.reading).push(tag);
+                if (!termTagsMap.has(tag.name)) {
+                    termTagsMap.set(tag.name, tag);
                 }
             }
         }
     }
 
-    for (const gloss in definitionsByGloss) {
-        const definition = definitionsByGloss[gloss];
-        definition.only = [];
-        if (!utilSetEqual(definition.expression, result.expression)) {
-            for (const expression of utilSetIntersection(definition.expression, result.expression)) {
-                definition.only.push(expression);
-            }
+    for (const definition of definitionsByGloss.values()) {
+        const only = [];
+        const expressionSet = definition.expression;
+        const readingSet = definition.reading;
+        if (!dictAreSetsEqual(expressionSet, resultExpressionSet)) {
+            only.push(...dictGetSetIntersection(expressionSet, resultExpressionSet));
         }
-        if (!utilSetEqual(definition.reading, result.reading)) {
-            for (const reading of utilSetIntersection(definition.reading, result.reading)) {
-                definition.only.push(reading);
-            }
+        if (!dictAreSetsEqual(readingSet, resultReadingSet)) {
+            only.push(...dictGetSetIntersection(readingSet, resultReadingSet));
         }
+        definition.only = only;
     }
 
     return definitionsByGloss;
diff --git a/ext/bg/js/settings/dictionaries.js b/ext/bg/js/settings/dictionaries.js
index adad76fb..427f47f0 100644
--- a/ext/bg/js/settings/dictionaries.js
+++ b/ext/bg/js/settings/dictionaries.js
@@ -491,15 +491,18 @@ function dictionaryErrorsShow(errors) {
     dialog.textContent = '';
 
     if (errors !== null && errors.length > 0) {
-        const uniqueErrors = {};
+        const uniqueErrors = new Map();
         for (let e of errors) {
             console.error(e);
             e = dictionaryErrorToString(e);
-            uniqueErrors[e] = hasOwn(uniqueErrors, e) ? uniqueErrors[e] + 1 : 1;
+            let count = uniqueErrors.get(e);
+            if (typeof count === 'undefined') {
+                count = 0;
+            }
+            uniqueErrors.set(e, count + 1);
         }
 
-        for (const e in uniqueErrors) {
-            const count = uniqueErrors[e];
+        for (const [e, count] of uniqueErrors.entries()) {
             const div = document.createElement('p');
             if (count > 1) {
                 div.textContent = `${e} `;
diff --git a/ext/bg/js/translator.js b/ext/bg/js/translator.js
index 3471cb01..a675a9f7 100644
--- a/ext/bg/js/translator.js
+++ b/ext/bg/js/translator.js
@@ -70,8 +70,8 @@ class Translator {
         return {sequencedDefinitions, defaultDefinitions};
     }
 
-    async getMergedSecondarySearchResults(text, expressionsMap, secondarySearchTitles) {
-        if (secondarySearchTitles.length === 0) {
+    async getMergedSecondarySearchResults(text, expressionsMap, secondarySearchDictionaries) {
+        if (secondarySearchDictionaries.size === 0) {
             return [];
         }
 
@@ -85,7 +85,7 @@ class Translator {
             }
         }
 
-        const definitions = await this.database.findTermsExactBulk(expressionList, readingList, secondarySearchTitles);
+        const definitions = await this.database.findTermsExactBulk(expressionList, readingList, secondarySearchDictionaries);
         for (const definition of definitions) {
             const definitionTags = await this.expandTags(definition.definitionTags, definition.dictionary);
             definitionTags.push(dictTagBuildSource(definition.dictionary));
@@ -101,7 +101,7 @@ class Translator {
         return definitions;
     }
 
-    async getMergedDefinition(text, dictionaries, sequencedDefinition, defaultDefinitions, secondarySearchTitles, mergedByTermIndices) {
+    async getMergedDefinition(text, dictionaries, sequencedDefinition, defaultDefinitions, secondarySearchDictionaries, mergedByTermIndices) {
         const result = sequencedDefinition.definitions;
         const rawDefinitionsBySequence = sequencedDefinition.rawDefinitions;
 
@@ -114,12 +114,11 @@ class Translator {
         }
 
         const definitionsByGloss = dictTermsMergeByGloss(result, rawDefinitionsBySequence);
-        const secondarySearchResults = await this.getMergedSecondarySearchResults(text, result.expressions, secondarySearchTitles);
+        const secondarySearchResults = await this.getMergedSecondarySearchResults(text, result.expressions, secondarySearchDictionaries);
 
         dictTermsMergeByGloss(result, defaultDefinitions.concat(secondarySearchResults), definitionsByGloss, mergedByTermIndices);
 
-        for (const gloss in definitionsByGloss) {
-            const definition = definitionsByGloss[gloss];
+        for (const definition of definitionsByGloss.values()) {
             dictTagsSort(definition.definitionTags);
             result.definitions.push(definition);
         }
@@ -128,7 +127,8 @@ class Translator {
 
         const expressions = [];
         for (const [expression, readingMap] of result.expressions.entries()) {
-            for (const [reading, termTags] of readingMap.entries()) {
+            for (const [reading, termTagsMap] of readingMap.entries()) {
+                const termTags = [...termTagsMap.values()];
                 const score = termTags.map((tag) => tag.score).reduce((p, v) => p + v, 0);
                 expressions.push(Translator.createExpression(expression, reading, dictTagsSort(termTags), Translator.scoreToTermFrequency(score)));
             }
@@ -141,14 +141,16 @@ class Translator {
         return result;
     }
 
-    async findTerms(text, details, options) {
-        switch (options.general.resultOutputMode) {
+    async findTerms(mode, text, details, options) {
+        switch (mode) {
             case 'group':
                 return await this.findTermsGrouped(text, details, options);
             case 'merge':
                 return await this.findTermsMerged(text, details, options);
             case 'split':
                 return await this.findTermsSplit(text, details, options);
+            case 'simple':
+                return await this.findTermsSimple(text, details, options);
             default:
                 return [[], 0];
         }
@@ -156,11 +158,10 @@ class Translator {
 
     async findTermsGrouped(text, details, options) {
         const dictionaries = dictEnabledSet(options);
-        const titles = Object.keys(dictionaries);
         const [definitions, length] = await this.findTermsInternal(text, dictionaries, details, options);
 
         const definitionsGrouped = dictTermsGroup(definitions, dictionaries);
-        await this.buildTermMeta(definitionsGrouped, titles);
+        await this.buildTermMeta(definitionsGrouped, dictionaries);
 
         if (options.general.compactTags) {
             for (const definition of definitionsGrouped) {
@@ -173,8 +174,12 @@ class Translator {
 
     async findTermsMerged(text, details, options) {
         const dictionaries = dictEnabledSet(options);
-        const secondarySearchTitles = Object.keys(options.dictionaries).filter((dict) => options.dictionaries[dict].allowSecondarySearches);
-        const titles = Object.keys(dictionaries);
+        const secondarySearchDictionaries = new Map();
+        for (const [title, dictionary] of dictionaries.entries()) {
+            if (!dictionary.allowSecondarySearches) { continue; }
+            secondarySearchDictionaries.set(title, dictionary);
+        }
+
         const [definitions, length] = await this.findTermsInternal(text, dictionaries, details, options);
         const {sequencedDefinitions, defaultDefinitions} = await this.getSequencedDefinitions(definitions, options.general.mainDictionary);
         const definitionsMerged = [];
@@ -186,7 +191,7 @@ class Translator {
                 dictionaries,
                 sequencedDefinition,
                 defaultDefinitions,
-                secondarySearchTitles,
+                secondarySearchDictionaries,
                 mergedByTermIndices
             );
             definitionsMerged.push(result);
@@ -198,7 +203,7 @@ class Translator {
             definitionsMerged.push(groupedDefinition);
         }
 
-        await this.buildTermMeta(definitionsMerged, titles);
+        await this.buildTermMeta(definitionsMerged, dictionaries);
 
         if (options.general.compactTags) {
             for (const definition of definitionsMerged) {
@@ -211,25 +216,28 @@ class Translator {
 
     async findTermsSplit(text, details, options) {
         const dictionaries = dictEnabledSet(options);
-        const titles = Object.keys(dictionaries);
         const [definitions, length] = await this.findTermsInternal(text, dictionaries, details, options);
 
-        await this.buildTermMeta(definitions, titles);
+        await this.buildTermMeta(definitions, dictionaries);
 
         return [definitions, length];
     }
 
+    async findTermsSimple(text, details, options) {
+        const dictionaries = dictEnabledSet(options);
+        return await this.findTermsInternal(text, dictionaries, details, options);
+    }
+
     async findTermsInternal(text, dictionaries, details, options) {
         text = Translator.getSearchableText(text, options);
         if (text.length === 0) {
             return [[], 0];
         }
 
-        const titles = Object.keys(dictionaries);
         const deinflections = (
             details.wildcard ?
-            await this.findTermWildcard(text, titles, details.wildcard) :
-            await this.findTermDeinflections(text, titles, options)
+            await this.findTermWildcard(text, dictionaries, details.wildcard) :
+            await this.findTermDeinflections(text, dictionaries, options)
         );
 
         let definitions = [];
@@ -271,8 +279,8 @@ class Translator {
         return [definitions, length];
     }
 
-    async findTermWildcard(text, titles, wildcard) {
-        const definitions = await this.database.findTermsBulk([text], titles, wildcard);
+    async findTermWildcard(text, dictionaries, wildcard) {
+        const definitions = await this.database.findTermsBulk([text], dictionaries, wildcard);
         if (definitions.length === 0) {
             return [];
         }
@@ -287,7 +295,7 @@ class Translator {
         }];
     }
 
-    async findTermDeinflections(text, titles, options) {
+    async findTermDeinflections(text, dictionaries, options) {
         const deinflections = this.getAllDeinflections(text, options);
 
         if (deinflections.length === 0) {
@@ -309,7 +317,7 @@ class Translator {
             deinflectionArray.push(deinflection);
         }
 
-        const definitions = await this.database.findTermsBulk(uniqueDeinflectionTerms, titles, null);
+        const definitions = await this.database.findTermsBulk(uniqueDeinflectionTerms, dictionaries, null);
 
         for (const definition of definitions) {
             const definitionRules = Deinflector.rulesToRuleFlags(definition.rules);
@@ -399,17 +407,12 @@ class Translator {
 
     async findKanji(text, options) {
         const dictionaries = dictEnabledSet(options);
-        const titles = Object.keys(dictionaries);
-        const kanjiUnique = {};
-        const kanjiList = [];
+        const kanjiUnique = new Set();
         for (const c of text) {
-            if (!hasOwn(kanjiUnique, c)) {
-                kanjiList.push(c);
-                kanjiUnique[c] = true;
-            }
+            kanjiUnique.add(c);
         }
 
-        const definitions = await this.database.findKanjiBulk(kanjiList, titles);
+        const definitions = await this.database.findKanjiBulk([...kanjiUnique], dictionaries);
         if (definitions.length === 0) {
             return definitions;
         }
@@ -429,12 +432,12 @@ class Translator {
             definition.stats = stats;
         }
 
-        await this.buildKanjiMeta(definitions, titles);
+        await this.buildKanjiMeta(definitions, dictionaries);
 
         return definitions;
     }
 
-    async buildTermMeta(definitions, titles) {
+    async buildTermMeta(definitions, dictionaries) {
         const terms = [];
         for (const definition of definitions) {
             if (definition.expressions) {
@@ -468,7 +471,7 @@ class Translator {
             term.frequencies = [];
         }
 
-        const metas = await this.database.findTermMetaBulk(expressionsUnique, titles);
+        const metas = await this.database.findTermMetaBulk(expressionsUnique, dictionaries);
         for (const {expression, mode, data, dictionary, index} of metas) {
             switch (mode) {
                 case 'freq':
@@ -480,14 +483,14 @@ class Translator {
         }
     }
 
-    async buildKanjiMeta(definitions, titles) {
+    async buildKanjiMeta(definitions, dictionaries) {
         const kanjiList = [];
         for (const definition of definitions) {
             kanjiList.push(definition.character);
             definition.frequencies = [];
         }
 
-        const metas = await this.database.findKanjiMetaBulk(kanjiList, titles);
+        const metas = await this.database.findKanjiMetaBulk(kanjiList, dictionaries);
         for (const {character, mode, data, dictionary, index} of metas) {
             switch (mode) {
                 case 'freq':
@@ -510,28 +513,29 @@ class Translator {
         const names = Object.keys(items);
         const tagMetaList = await this.getTagMetaList(names, title);
 
-        const stats = {};
+        const statsGroups = new Map();
         for (let i = 0; i < names.length; ++i) {
             const name = names[i];
             const meta = tagMetaList[i];
             if (meta === null) { continue; }
 
             const category = meta.category;
-            const group = (
-                hasOwn(stats, category) ?
-                stats[category] :
-                (stats[category] = [])
-            );
+            let group = statsGroups.get(category);
+            if (typeof group === 'undefined') {
+                group = [];
+                statsGroups.set(category, group);
+            }
 
             const stat = Object.assign({}, meta, {name, value: items[name]});
             group.push(dictTagSanitize(stat));
         }
 
+        const stats = {};
         const sortCompare = (a, b) => a.notes - b.notes;
-        for (const category in stats) {
-            stats[category].sort(sortCompare);
+        for (const [category, group] of statsGroups.entries()) {
+            group.sort(sortCompare);
+            stats[category] = group;
         }
-
         return stats;
     }
 
diff --git a/ext/bg/js/util.js b/ext/bg/js/util.js
index 333e814b..9ebd2ac4 100644
--- a/ext/bg/js/util.js
+++ b/ext/bg/js/util.js
@@ -59,32 +59,6 @@ function utilBackgroundFunctionIsolate(func) {
     return backgroundPage.utilFunctionIsolate(func);
 }
 
-function utilSetEqual(setA, setB) {
-    if (setA.size !== setB.size) {
-        return false;
-    }
-
-    for (const value of setA) {
-        if (!setB.has(value)) {
-            return false;
-        }
-    }
-
-    return true;
-}
-
-function utilSetIntersection(setA, setB) {
-    return new Set(
-        [...setA].filter((value) => setB.has(value))
-    );
-}
-
-function utilSetDifference(setA, setB) {
-    return new Set(
-        [...setA].filter((value) => !setB.has(value))
-    );
-}
-
 function utilStringHashCode(string) {
     let hashCode = 0;