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+/*
+ * Copyright (C) 2021  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * DictionaryDataUtil
+ */
+
+/**
+ * This class is used to convert the internal dictionary entry format to the
+ * format used by Anki, for backwards compatibility.
+ */
+class AnkiNoteDataCreator {
+    /**
+     * Creates a new instance.
+     * @param japaneseUtil An instance of `JapaneseUtil`.
+     */
+    constructor(japaneseUtil) {
+        this._japaneseUtil = japaneseUtil;
+    }
+
+    /**
+     * Creates a compatibility representation of the specified data.
+     * @param marker The marker that is being used for template rendering.
+     * @returns An object used for rendering Anki templates.
+     */
+    create(marker, {
+        definition: dictionaryEntry,
+        resultOutputMode,
+        mode,
+        glossaryLayoutMode,
+        compactTags,
+        context,
+        injectedMedia=null
+    }) {
+        const self = this;
+        const definition = this.createCachedValue(this._getDefinition.bind(this, dictionaryEntry, injectedMedia, context, resultOutputMode));
+        const uniqueExpressions = this.createCachedValue(this._getUniqueExpressions.bind(this, dictionaryEntry));
+        const uniqueReadings = this.createCachedValue(this._getUniqueReadings.bind(this, dictionaryEntry));
+        const context2 = this.createCachedValue(this._getPublicContext.bind(this, context));
+        const pitches = this.createCachedValue(this._getPitches.bind(this, dictionaryEntry));
+        const pitchCount = this.createCachedValue(this._getPitchCount.bind(this, pitches));
+        return {
+            marker,
+            get definition() { return self.getCachedValue(definition); },
+            glossaryLayoutMode,
+            compactTags,
+            group: (resultOutputMode === 'group'),
+            merge: (resultOutputMode === 'merge'),
+            modeTermKanji: (mode === 'term-kanji'),
+            modeTermKana: (mode === 'term-kana'),
+            modeKanji: (mode === 'kanji'),
+            compactGlossaries: (glossaryLayoutMode === 'compact'),
+            get uniqueExpressions() { return self.getCachedValue(uniqueExpressions); },
+            get uniqueReadings() { return self.getCachedValue(uniqueReadings); },
+            get pitches() { return self.getCachedValue(pitches); },
+            get pitchCount() { return self.getCachedValue(pitchCount); },
+            get context() { return self.getCachedValue(context2); }
+        };
+    }
+
+    /**
+     * Creates a deferred-evaluation value.
+     * @param getter The function to invoke to get the return value.
+     * @returns An object which can be passed into `getCachedValue`.
+     */
+    createCachedValue(getter) {
+        return {getter, hasValue: false, value: void 0};
+    }
+
+    /**
+     * Gets the value of a cached object.
+     * @param item An object that was returned from `createCachedValue`.
+     * @returns The result of evaluating the getter, which is cached after the first invocation.
+     */
+    getCachedValue(item) {
+        if (item.hasValue) { return item.value; }
+        const value = item.getter();
+        item.value = value;
+        item.hasValue = true;
+        return value;
+    }
+
+    // Private
+
+    _asObject(value) {
+        return (typeof value === 'object' && value !== null ? value : {});
+    }
+
+    _getPrimarySource(dictionaryEntry) {
+        for (const headword of dictionaryEntry.headwords) {
+            for (const source of headword.sources) {
+                if (source.isPrimary) { return source; }
+            }
+        }
+        return null;
+    }
+
+    _getUniqueExpressions(dictionaryEntry) {
+        if (dictionaryEntry.type === 'term') {
+            const results = new Set();
+            for (const {term} of dictionaryEntry.headwords) {
+                results.add(term);
+            }
+            return [...results];
+        } else {
+            return [];
+        }
+    }
+
+    _getUniqueReadings(dictionaryEntry) {
+        if (dictionaryEntry.type === 'term') {
+            const results = new Set();
+            for (const {reading} of dictionaryEntry.headwords) {
+                results.add(reading);
+            }
+            return [...results];
+        } else {
+            return [];
+        }
+    }
+
+    _getPublicContext(context) {
+        let {documentTitle} = this._asObject(context);
+        if (typeof documentTitle !== 'string') { documentTitle = ''; }
+        return {
+            document: {
+                title: documentTitle
+            }
+        };
+    }
+
+    _getPitches(dictionaryEntry) {
+        const results = [];
+        if (dictionaryEntry.type === 'term') {
+            for (const {dictionary, pitches} of DictionaryDataUtil.getPitchAccentInfos(dictionaryEntry)) {
+                const pitches2 = [];
+                for (const {terms, reading, position, tags, exclusiveTerms, exclusiveReadings} of pitches) {
+                    pitches2.push({
+                        expressions: terms,
+                        reading,
+                        position,
+                        tags,
+                        exclusiveExpressions: exclusiveTerms,
+                        exclusiveReadings
+                    });
+                }
+                results.push({dictionary, pitches: pitches2});
+            }
+        }
+        return results;
+    }
+
+    _getPitchCount(cachedPitches) {
+        const pitches = this.getCachedValue(cachedPitches);
+        return pitches.reduce((i, v) => i + v.pitches.length, 0);
+    }
+
+    _getDefinition(dictionaryEntry, injectedMedia, context, resultOutputMode) {
+        switch (dictionaryEntry.type) {
+            case 'term':
+                return this._getTermDefinition(dictionaryEntry, injectedMedia, context, resultOutputMode);
+            case 'kanji':
+                return this._getKanjiDefinition(dictionaryEntry, injectedMedia, context);
+            default:
+                return {};
+        }
+    }
+
+    _getKanjiDefinition(dictionaryEntry, injectedMedia, context) {
+        const self = this;
+
+        const {character, dictionary, onyomi, kunyomi, definitions} = dictionaryEntry;
+
+        const {
+            screenshotFileName=null,
+            clipboardImageFileName=null,
+            clipboardText=null,
+            audioFileName=null
+        } = this._asObject(injectedMedia);
+
+        let {url} = this._asObject(context);
+        if (typeof url !== 'string') { url = ''; }
+
+        const stats = this.createCachedValue(this._getKanjiStats.bind(this, dictionaryEntry));
+        const tags = this.createCachedValue(this._convertTags.bind(this, dictionaryEntry.tags));
+        const frequencies = this.createCachedValue(this._getKanjiFrequencies.bind(this, dictionaryEntry));
+        const cloze = this.createCachedValue(this._getCloze.bind(this, dictionaryEntry, context));
+
+        return {
+            type: 'kanji',
+            character,
+            dictionary,
+            onyomi,
+            kunyomi,
+            glossary: definitions,
+            get tags() { return self.getCachedValue(tags); },
+            get stats() { return self.getCachedValue(stats); },
+            get frequencies() { return self.getCachedValue(frequencies); },
+            screenshotFileName,
+            clipboardImageFileName,
+            clipboardText,
+            audioFileName,
+            url,
+            get cloze() { return self.getCachedValue(cloze); }
+        };
+    }
+
+    _getKanjiStats(dictionaryEntry) {
+        const results = {};
+        for (const [key, value] of Object.entries(dictionaryEntry.stats)) {
+            results[key] = value.map(this._convertKanjiStat.bind(this));
+        }
+        return results;
+    }
+
+    _convertKanjiStat({name, category, content, order, score, dictionary, value}) {
+        return {
+            name,
+            category,
+            notes: content,
+            order,
+            score,
+            dictionary,
+            value
+        };
+    }
+
+    _getKanjiFrequencies(dictionaryEntry) {
+        const results = [];
+        for (const {index, dictionary, dictionaryIndex, dictionaryPriority, character, frequency} of dictionaryEntry.frequencies) {
+            results.push({
+                index,
+                dictionary,
+                dictionaryOrder: {
+                    index: dictionaryIndex,
+                    priority: dictionaryPriority
+                },
+                character,
+                frequency
+            });
+        }
+        return results;
+    }
+
+    _getTermDefinition(dictionaryEntry, injectedMedia, context, resultOutputMode) {
+        const self = this;
+
+        let type = 'term';
+        switch (resultOutputMode) {
+            case 'group': type = 'termGrouped'; break;
+            case 'merge': type = 'termMerged'; break;
+        }
+
+        const {id, inflections, score, dictionaryIndex, dictionaryPriority, sourceTermExactMatchCount} = dictionaryEntry;
+
+        const {
+            screenshotFileName=null,
+            clipboardImageFileName=null,
+            clipboardText=null,
+            audioFileName=null
+        } = this._asObject(injectedMedia);
+
+        let {url} = this._asObject(context);
+        if (typeof url !== 'string') { url = ''; }
+
+        const primarySource = this._getPrimarySource(dictionaryEntry);
+
+        const dictionaryNames = this.createCachedValue(this._getTermDictionaryNames.bind(this, dictionaryEntry));
+        const commonInfo = this.createCachedValue(this._getTermDictionaryEntryCommonInfo.bind(this, dictionaryEntry, type));
+        const termTags = this.createCachedValue(this._getTermTags.bind(this, dictionaryEntry, type));
+        const expressions = this.createCachedValue(this._getTermExpressions.bind(this, dictionaryEntry));
+        const frequencies = this.createCachedValue(this._getTermFrequencies.bind(this, dictionaryEntry));
+        const pitches = this.createCachedValue(this._getTermPitches.bind(this, dictionaryEntry));
+        const glossary = this.createCachedValue(this._getTermGlossaryArray.bind(this, dictionaryEntry, type));
+        const cloze = this.createCachedValue(this._getCloze.bind(this, dictionaryEntry, context));
+        const furiganaSegments = this.createCachedValue(this._getTermFuriganaSegments.bind(this, dictionaryEntry, type));
+
+        return {
+            type,
+            id: (type === 'term' ? id : void 0),
+            source: (primarySource !== null ? primarySource.transformedText : null),
+            rawSource: (primarySource !== null ? primarySource.originalText : null),
+            sourceTerm: (type !== 'termMerged' ? (primarySource !== null ? primarySource.deinflectedText : null) : void 0),
+            reasons: inflections,
+            score,
+            isPrimary: (type === 'term' ? dictionaryEntry.isPrimary : void 0),
+            sequence: (type === 'term' ? dictionaryEntry.sequence : void 0),
+            get dictionary() { return self.getCachedValue(dictionaryNames)[0]; },
+            dictionaryOrder: {
+                index: dictionaryIndex,
+                priority: dictionaryPriority
+            },
+            get dictionaryNames() { return self.getCachedValue(dictionaryNames); },
+            get expression() {
+                const {uniqueTerms} = self.getCachedValue(commonInfo);
+                return (type === 'term' || type === 'termGrouped' ? uniqueTerms[0] : uniqueTerms);
+            },
+            get reading() {
+                const {uniqueReadings} = self.getCachedValue(commonInfo);
+                return (type === 'term' || type === 'termGrouped' ? uniqueReadings[0] : uniqueReadings);
+            },
+            get expressions() { return self.getCachedValue(expressions); },
+            get glossary() { return self.getCachedValue(glossary); },
+            get definitionTags() { return type === 'term' ? self.getCachedValue(commonInfo).definitionTags : void 0; },
+            get termTags() { return self.getCachedValue(termTags); },
+            get definitions() { return self.getCachedValue(commonInfo).definitions; },
+            get frequencies() { return self.getCachedValue(frequencies); },
+            get pitches() { return self.getCachedValue(pitches); },
+            sourceTermExactMatchCount,
+            screenshotFileName,
+            clipboardImageFileName,
+            clipboardText,
+            audioFileName,
+            url,
+            get cloze() { return self.getCachedValue(cloze); },
+            get furiganaSegments() { return self.getCachedValue(furiganaSegments); }
+        };
+    }
+
+    _getTermDictionaryNames(dictionaryEntry) {
+        const dictionaryNames = new Set();
+        for (const {dictionary} of dictionaryEntry.definitions) {
+            dictionaryNames.add(dictionary);
+        }
+        return [...dictionaryNames];
+    }
+
+    _getTermDictionaryEntryCommonInfo(dictionaryEntry, type) {
+        const merged = (type === 'termMerged');
+        const hasDefinitions = (type !== 'term');
+
+        const allTermsSet = new Set();
+        const allReadingsSet = new Set();
+        for (const {term, reading} of dictionaryEntry.headwords) {
+            allTermsSet.add(term);
+            allReadingsSet.add(reading);
+        }
+        const uniqueTerms = [...allTermsSet];
+        const uniqueReadings = [...allReadingsSet];
+
+        const definitions = [];
+        const definitionTags = [];
+        for (const {tags, headwordIndices, entries, dictionary} of dictionaryEntry.definitions) {
+            const definitionTags2 = [];
+            for (const tag of tags) {
+                definitionTags.push(this._convertTag(tag));
+                definitionTags2.push(this._convertTag(tag));
+            }
+            if (!hasDefinitions) { continue; }
+            const only = merged ? DictionaryDataUtil.getDisambiguations(dictionaryEntry.headwords, headwordIndices, allTermsSet, allReadingsSet) : void 0;
+            definitions.push({
+                dictionary,
+                glossary: entries,
+                definitionTags: definitionTags2,
+                only
+            });
+        }
+
+        return {
+            uniqueTerms,
+            uniqueReadings,
+            definitionTags,
+            definitions: hasDefinitions ? definitions : void 0
+        };
+    }
+
+    _getTermFrequencies(dictionaryEntry) {
+        const results = [];
+        const {headwords} = dictionaryEntry;
+        for (const {headwordIndex, dictionary, dictionaryIndex, dictionaryPriority, hasReading, frequency} of dictionaryEntry.frequencies) {
+            const {term, reading} = headwords[headwordIndex];
+            results.push({
+                index: results.length,
+                expressionIndex: headwordIndex,
+                dictionary,
+                dictionaryOrder: {
+                    index: dictionaryIndex,
+                    priority: dictionaryPriority
+                },
+                expression: term,
+                reading,
+                hasReading,
+                frequency
+            });
+        }
+        return results;
+    }
+
+    _getTermPitches(dictionaryEntry) {
+        const self = this;
+        const results = [];
+        const {headwords} = dictionaryEntry;
+        for (const {headwordIndex, dictionary, dictionaryIndex, dictionaryPriority, pitches} of dictionaryEntry.pronunciations) {
+            const {term, reading} = headwords[headwordIndex];
+            const cachedPitches = this.createCachedValue(this._getTermPitchesInner.bind(this, pitches));
+            results.push({
+                index: results.length,
+                expressionIndex: headwordIndex,
+                dictionary,
+                dictionaryOrder: {
+                    index: dictionaryIndex,
+                    priority: dictionaryPriority
+                },
+                expression: term,
+                reading,
+                get pitches() { return self.getCachedValue(cachedPitches); }
+            });
+        }
+        return results;
+    }
+
+    _getTermPitchesInner(pitches) {
+        const self = this;
+        const results = [];
+        for (const {position, tags} of pitches) {
+            const cachedTags = this.createCachedValue(this._convertTags.bind(this, tags));
+            results.push({
+                position,
+                get tags() { return self.getCachedValue(cachedTags); }
+            });
+        }
+        return results;
+    }
+
+    _getTermExpressions(dictionaryEntry) {
+        const self = this;
+        const results = [];
+        const {headwords} = dictionaryEntry;
+        for (let i = 0, ii = headwords.length; i < ii; ++i) {
+            const {term, reading, tags, sources: [{deinflectedText}]} = headwords[i];
+            const termTags = this.createCachedValue(this._convertTags.bind(this, tags));
+            const frequencies = this.createCachedValue(this._getTermExpressionFrequencies.bind(this, dictionaryEntry, i));
+            const pitches = this.createCachedValue(this._getTermExpressionPitches.bind(this, dictionaryEntry, i));
+            const termFrequency = this.createCachedValue(this._getTermExpressionTermFrequency.bind(this, termTags));
+            const furiganaSegments = this.createCachedValue(this._getTermHeadwordFuriganaSegments.bind(this, term, reading));
+            const item = {
+                sourceTerm: deinflectedText,
+                expression: term,
+                reading,
+                get termTags() { return self.getCachedValue(termTags); },
+                get frequencies() { return self.getCachedValue(frequencies); },
+                get pitches() { return self.getCachedValue(pitches); },
+                get furiganaSegments() { return self.getCachedValue(furiganaSegments); },
+                get termFrequency() { return self.getCachedValue(termFrequency); }
+            };
+            results.push(item);
+        }
+        return results;
+    }
+
+    _getTermExpressionFrequencies(dictionaryEntry, i) {
+        const results = [];
+        const {headwords, frequencies} = dictionaryEntry;
+        for (const {headwordIndex, dictionary, dictionaryIndex, dictionaryPriority, hasReading, frequency} of frequencies) {
+            if (headwordIndex !== i) { continue; }
+            const {term, reading} = headwords[headwordIndex];
+            results.push({
+                index: results.length,
+                expressionIndex: headwordIndex,
+                dictionary,
+                dictionaryOrder: {
+                    index: dictionaryIndex,
+                    priority: dictionaryPriority
+                },
+                expression: term,
+                reading,
+                hasReading,
+                frequency
+            });
+        }
+        return results;
+    }
+
+    _getTermExpressionPitches(dictionaryEntry, i) {
+        const self = this;
+        const results = [];
+        const {headwords, pronunciations} = dictionaryEntry;
+        for (const {headwordIndex, dictionary, dictionaryIndex, dictionaryPriority, pitches} of pronunciations) {
+            if (headwordIndex !== i) { continue; }
+            const {term, reading} = headwords[headwordIndex];
+            const cachedPitches = this.createCachedValue(this._getTermPitchesInner.bind(this, pitches));
+            results.push({
+                index: results.length,
+                expressionIndex: headwordIndex,
+                dictionary,
+                dictionaryOrder: {
+                    index: dictionaryIndex,
+                    priority: dictionaryPriority
+                },
+                expression: term,
+                reading,
+                get pitches() { return self.getCachedValue(cachedPitches); }
+            });
+        }
+        return results;
+    }
+
+    _getTermExpressionTermFrequency(cachedTermTags) {
+        const termTags = this.getCachedValue(cachedTermTags);
+        return DictionaryDataUtil.getTermFrequency(termTags);
+    }
+
+    _getTermGlossaryArray(dictionaryEntry, type) {
+        if (type === 'term') {
+            const results = [];
+            for (const {entries} of dictionaryEntry.definitions) {
+                results.push(...entries);
+            }
+            return results;
+        }
+        return void 0;
+    }
+
+    _getTermTags(dictionaryEntry, type) {
+        if (type !== 'termMerged') {
+            const results = [];
+            for (const {tag} of DictionaryDataUtil.groupTermTags(dictionaryEntry)) {
+                results.push(this._convertTag(tag));
+            }
+            return results;
+        }
+        return void 0;
+    }
+
+    _convertTags(tags) {
+        const results = [];
+        for (const tag of tags) {
+            results.push(this._convertTag(tag));
+        }
+        return results;
+    }
+
+    _convertTag({name, category, content, order, score, dictionaries, redundant}) {
+        return {
+            name,
+            category,
+            notes: (content.length > 0 ? content[0] : ''),
+            order,
+            score,
+            dictionary: (dictionaries.length > 0 ? dictionaries[0] : ''),
+            redundant
+        };
+    }
+
+    _getCloze(dictionaryEntry, context) {
+        let originalText = '';
+        switch (dictionaryEntry.type) {
+            case 'term':
+                {
+                    const primarySource = this._getPrimarySource(dictionaryEntry);
+                    if (primarySource !== null) { originalText = primarySource.originalText; }
+                }
+                break;
+            case 'kanji':
+                originalText = dictionaryEntry.character;
+                break;
+        }
+
+        const {sentence} = this._asObject(context);
+        let {text, offset} = this._asObject(sentence);
+        if (typeof text !== 'string') { text = ''; }
+        if (typeof offset !== 'number') { offset = 0; }
+
+        return {
+            sentence: text,
+            prefix: text.substring(0, offset),
+            body: text.substring(offset, offset + originalText.length),
+            suffix: text.substring(offset + originalText.length)
+        };
+    }
+
+    _getTermFuriganaSegments(dictionaryEntry, type) {
+        if (type === 'term') {
+            for (const {term, reading} of dictionaryEntry.headwords) {
+                return this._getTermHeadwordFuriganaSegments(term, reading);
+            }
+        }
+        return void 0;
+    }
+
+    _getTermHeadwordFuriganaSegments(term, reading) {
+        return this._japaneseUtil.distributeFurigana(term, reading);
+    }
+}