Move dictionary import functionality into a new class

3 files changed, 269 insertions, 232 deletions

diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 3ef7c62c..1e8c979f 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -25,6 +25,7 @@
  * BackendApiForwarder
  * ClipboardMonitor
  * Database
+ * DictionaryImporter
  * JsonSchema
  * Mecab
  * Translator
@@ -45,6 +46,7 @@
 class Backend {
     constructor() {
         this.database = new Database();
+        this.dictionaryImporter = new DictionaryImporter();
         this.translator = new Translator(this.database);
         this.anki = new AnkiNull();
         this.mecab = new Mecab();
@@ -300,7 +302,7 @@ class Backend {
     }
 
     async importDictionary(archiveSource, onProgress, details) {
-        return await this.translator.database.importDictionary(archiveSource, onProgress, details);
+        return await this.dictionaryImporter.import(this.database, archiveSource, onProgress, details);
     }
 
     // Message handlers
diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index 269ad57e..7a4d094b 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -366,172 +366,6 @@ class Database {
         });
     }
 
-    async importDictionary(archiveSource, onProgress, details) {
-        this._validate();
-        const hasOnProgress = (typeof onProgress === 'function');
-
-        // Read archive
-        const archive = await JSZip.loadAsync(archiveSource);
-
-        // Read and validate index
-        const indexFileName = 'index.json';
-        const indexFile = archive.files[indexFileName];
-        if (!indexFile) {
-            throw new Error('No dictionary index found in archive');
-        }
-
-        const index = JSON.parse(await indexFile.async('string'));
-
-        const indexSchema = await this._getSchema('/bg/data/dictionary-index-schema.json');
-        Database._validateJsonSchema(index, indexSchema, indexFileName);
-
-        const dictionaryTitle = index.title;
-        const version = index.format || index.version;
-
-        if (!dictionaryTitle || !index.revision) {
-            throw new Error('Unrecognized dictionary format');
-        }
-
-        // Verify database is not already imported
-        if (await this.dictionaryExists(dictionaryTitle)) {
-            throw new Error('Dictionary is already imported');
-        }
-
-        // Data format converters
-        const convertTermBankEntry = (entry) => {
-            if (version === 1) {
-                const [expression, reading, definitionTags, rules, score, ...glossary] = entry;
-                return {expression, reading, definitionTags, rules, score, glossary};
-            } else {
-                const [expression, reading, definitionTags, rules, score, glossary, sequence, termTags] = entry;
-                return {expression, reading, definitionTags, rules, score, glossary, sequence, termTags};
-            }
-        };
-
-        const convertTermMetaBankEntry = (entry) => {
-            const [expression, mode, data] = entry;
-            return {expression, mode, data};
-        };
-
-        const convertKanjiBankEntry = (entry) => {
-            if (version === 1) {
-                const [character, onyomi, kunyomi, tags, ...meanings] = entry;
-                return {character, onyomi, kunyomi, tags, meanings};
-            } else {
-                const [character, onyomi, kunyomi, tags, meanings, stats] = entry;
-                return {character, onyomi, kunyomi, tags, meanings, stats};
-            }
-        };
-
-        const convertKanjiMetaBankEntry = (entry) => {
-            const [character, mode, data] = entry;
-            return {character, mode, data};
-        };
-
-        const convertTagBankEntry = (entry) => {
-            const [name, category, order, notes, score] = entry;
-            return {name, category, order, notes, score};
-        };
-
-        // Archive file reading
-        const readFileSequence = async (fileNameFormat, convertEntry, schema) => {
-            const results = [];
-            for (let i = 1; true; ++i) {
-                const fileName = fileNameFormat.replace(/\?/, `${i}`);
-                const file = archive.files[fileName];
-                if (!file) { break; }
-
-                const entries = JSON.parse(await file.async('string'));
-                Database._validateJsonSchema(entries, schema, fileName);
-
-                for (let entry of entries) {
-                    entry = convertEntry(entry);
-                    entry.dictionary = dictionaryTitle;
-                    results.push(entry);
-                }
-            }
-            return results;
-        };
-
-        // Load schemas
-        const dataBankSchemaPaths = this.constructor._getDataBankSchemaPaths(version);
-        const dataBankSchemas = await Promise.all(dataBankSchemaPaths.map((path) => this._getSchema(path)));
-
-        // Load data
-        const termList      = await readFileSequence('term_bank_?.json',       convertTermBankEntry,      dataBankSchemas[0]);
-        const termMetaList  = await readFileSequence('term_meta_bank_?.json',  convertTermMetaBankEntry,  dataBankSchemas[1]);
-        const kanjiList     = await readFileSequence('kanji_bank_?.json',      convertKanjiBankEntry,     dataBankSchemas[2]);
-        const kanjiMetaList = await readFileSequence('kanji_meta_bank_?.json', convertKanjiMetaBankEntry, dataBankSchemas[3]);
-        const tagList       = await readFileSequence('tag_bank_?.json',        convertTagBankEntry,       dataBankSchemas[4]);
-
-        // Old tags
-        const indexTagMeta = index.tagMeta;
-        if (typeof indexTagMeta === 'object' && indexTagMeta !== null) {
-            for (const name of Object.keys(indexTagMeta)) {
-                const {category, order, notes, score} = indexTagMeta[name];
-                tagList.push({name, category, order, notes, score});
-            }
-        }
-
-        // Prefix wildcard support
-        const prefixWildcardsSupported = !!details.prefixWildcardsSupported;
-        if (prefixWildcardsSupported) {
-            for (const entry of termList) {
-                entry.expressionReverse = stringReverse(entry.expression);
-                entry.readingReverse = stringReverse(entry.reading);
-            }
-        }
-
-        // Add dictionary
-        const summary = {
-            title: dictionaryTitle,
-            revision: index.revision,
-            sequenced: index.sequenced,
-            version,
-            prefixWildcardsSupported
-        };
-
-        await this.bulkAdd('dictionaries', [summary], 0, 1);
-
-        // Add data
-        const errors = [];
-        const total = (
-            termList.length +
-            termMetaList.length +
-            kanjiList.length +
-            kanjiMetaList.length +
-            tagList.length
-        );
-        let loadedCount = 0;
-        const maxTransactionLength = 1000;
-
-        const bulkAdd = async (objectStoreName, entries) => {
-            const ii = entries.length;
-            for (let i = 0; i < ii; i += maxTransactionLength) {
-                const count = Math.min(maxTransactionLength, ii - i);
-
-                try {
-                    await this.bulkAdd(objectStoreName, entries, i, count);
-                } catch (e) {
-                    errors.push(e);
-                }
-
-                loadedCount += count;
-                if (hasOnProgress) {
-                    onProgress(total, loadedCount);
-                }
-            }
-        };
-
-        await bulkAdd('terms', termList);
-        await bulkAdd('termMeta', termMetaList);
-        await bulkAdd('kanji', kanjiList);
-        await bulkAdd('kanjiMeta', kanjiMetaList);
-        await bulkAdd('tagMeta', tagList);
-
-        return {result: summary, errors};
-    }
-
     // Private
 
     _validate() {
@@ -540,71 +374,6 @@ class Database {
         }
     }
 
-    async _getSchema(fileName) {
-        let schemaPromise = this._schemas.get(fileName);
-        if (typeof schemaPromise !== 'undefined') {
-            return schemaPromise;
-        }
-
-        schemaPromise = requestJson(chrome.runtime.getURL(fileName), 'GET');
-        this._schemas.set(fileName, schemaPromise);
-        return schemaPromise;
-    }
-
-    static _validateJsonSchema(value, schema, fileName) {
-        try {
-            JsonSchema.validate(value, schema);
-        } catch (e) {
-            throw Database._formatSchemaError(e, fileName);
-        }
-    }
-
-    static _formatSchemaError(e, fileName) {
-        const valuePathString = Database._getSchemaErrorPathString(e.info.valuePath, 'dictionary');
-        const schemaPathString = Database._getSchemaErrorPathString(e.info.schemaPath, 'schema');
-
-        const e2 = new Error(`Dictionary has invalid data in '${fileName}' for value '${valuePathString}', validated against '${schemaPathString}': ${e.message}`);
-        e2.data = e;
-
-        return e2;
-    }
-
-    static _getSchemaErrorPathString(infoList, base='') {
-        let result = base;
-        for (const [part] of infoList) {
-            switch (typeof part) {
-                case 'string':
-                    if (result.length > 0) {
-                        result += '.';
-                    }
-                    result += part;
-                    break;
-                case 'number':
-                    result += `[${part}]`;
-                    break;
-            }
-        }
-        return result;
-    }
-
-    static _getDataBankSchemaPaths(version) {
-        const termBank = (
-            version === 1 ?
-            '/bg/data/dictionary-term-bank-v1-schema.json' :
-            '/bg/data/dictionary-term-bank-v3-schema.json'
-        );
-        const termMetaBank = '/bg/data/dictionary-term-meta-bank-v3-schema.json';
-        const kanjiBank = (
-            version === 1 ?
-            '/bg/data/dictionary-kanji-bank-v1-schema.json' :
-            '/bg/data/dictionary-kanji-bank-v3-schema.json'
-        );
-        const kanjiMetaBank = '/bg/data/dictionary-kanji-meta-bank-v3-schema.json';
-        const tagBank = '/bg/data/dictionary-tag-bank-v3-schema.json';
-
-        return [termBank, termMetaBank, kanjiBank, kanjiMetaBank, tagBank];
-    }
-
     async _findGenericBulk(tableName, indexName, indexValueList, dictionaries, createResult) {
         this._validate();
 
diff --git a/ext/bg/js/dictionary-importer.js b/ext/bg/js/dictionary-importer.js
new file mode 100644
index 00000000..589e7656
--- /dev/null
+++ b/ext/bg/js/dictionary-importer.js
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2020  Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * 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
+ * JSZip
+ * JsonSchema
+ * requestJson
+ */
+
+class DictionaryImporter {
+    constructor() {
+        this._schemas = new Map();
+    }
+
+    async import(database, archiveSource, onProgress, details) {
+        if (!database) {
+            throw new Error('Invalid database');
+        }
+        if (!database.isPrepared()) {
+            throw new Error('Database is not ready');
+        }
+
+        const hasOnProgress = (typeof onProgress === 'function');
+
+        // Read archive
+        const archive = await JSZip.loadAsync(archiveSource);
+
+        // Read and validate index
+        const indexFileName = 'index.json';
+        const indexFile = archive.files[indexFileName];
+        if (!indexFile) {
+            throw new Error('No dictionary index found in archive');
+        }
+
+        const index = JSON.parse(await indexFile.async('string'));
+
+        const indexSchema = await this._getSchema('/bg/data/dictionary-index-schema.json');
+        this._validateJsonSchema(index, indexSchema, indexFileName);
+
+        const dictionaryTitle = index.title;
+        const version = index.format || index.version;
+
+        if (!dictionaryTitle || !index.revision) {
+            throw new Error('Unrecognized dictionary format');
+        }
+
+        // Verify database is not already imported
+        if (await database.dictionaryExists(dictionaryTitle)) {
+            throw new Error('Dictionary is already imported');
+        }
+
+        // Data format converters
+        const convertTermBankEntry = (entry) => {
+            if (version === 1) {
+                const [expression, reading, definitionTags, rules, score, ...glossary] = entry;
+                return {expression, reading, definitionTags, rules, score, glossary};
+            } else {
+                const [expression, reading, definitionTags, rules, score, glossary, sequence, termTags] = entry;
+                return {expression, reading, definitionTags, rules, score, glossary, sequence, termTags};
+            }
+        };
+
+        const convertTermMetaBankEntry = (entry) => {
+            const [expression, mode, data] = entry;
+            return {expression, mode, data};
+        };
+
+        const convertKanjiBankEntry = (entry) => {
+            if (version === 1) {
+                const [character, onyomi, kunyomi, tags, ...meanings] = entry;
+                return {character, onyomi, kunyomi, tags, meanings};
+            } else {
+                const [character, onyomi, kunyomi, tags, meanings, stats] = entry;
+                return {character, onyomi, kunyomi, tags, meanings, stats};
+            }
+        };
+
+        const convertKanjiMetaBankEntry = (entry) => {
+            const [character, mode, data] = entry;
+            return {character, mode, data};
+        };
+
+        const convertTagBankEntry = (entry) => {
+            const [name, category, order, notes, score] = entry;
+            return {name, category, order, notes, score};
+        };
+
+        // Archive file reading
+        const readFileSequence = async (fileNameFormat, convertEntry, schema) => {
+            const results = [];
+            for (let i = 1; true; ++i) {
+                const fileName = fileNameFormat.replace(/\?/, `${i}`);
+                const file = archive.files[fileName];
+                if (!file) { break; }
+
+                const entries = JSON.parse(await file.async('string'));
+                this._validateJsonSchema(entries, schema, fileName);
+
+                for (let entry of entries) {
+                    entry = convertEntry(entry);
+                    entry.dictionary = dictionaryTitle;
+                    results.push(entry);
+                }
+            }
+            return results;
+        };
+
+        // Load schemas
+        const dataBankSchemaPaths = this._getDataBankSchemaPaths(version);
+        const dataBankSchemas = await Promise.all(dataBankSchemaPaths.map((path) => this._getSchema(path)));
+
+        // Load data
+        const termList      = await readFileSequence('term_bank_?.json',       convertTermBankEntry,      dataBankSchemas[0]);
+        const termMetaList  = await readFileSequence('term_meta_bank_?.json',  convertTermMetaBankEntry,  dataBankSchemas[1]);
+        const kanjiList     = await readFileSequence('kanji_bank_?.json',      convertKanjiBankEntry,     dataBankSchemas[2]);
+        const kanjiMetaList = await readFileSequence('kanji_meta_bank_?.json', convertKanjiMetaBankEntry, dataBankSchemas[3]);
+        const tagList       = await readFileSequence('tag_bank_?.json',        convertTagBankEntry,       dataBankSchemas[4]);
+
+        // Old tags
+        const indexTagMeta = index.tagMeta;
+        if (typeof indexTagMeta === 'object' && indexTagMeta !== null) {
+            for (const name of Object.keys(indexTagMeta)) {
+                const {category, order, notes, score} = indexTagMeta[name];
+                tagList.push({name, category, order, notes, score});
+            }
+        }
+
+        // Prefix wildcard support
+        const prefixWildcardsSupported = !!details.prefixWildcardsSupported;
+        if (prefixWildcardsSupported) {
+            for (const entry of termList) {
+                entry.expressionReverse = stringReverse(entry.expression);
+                entry.readingReverse = stringReverse(entry.reading);
+            }
+        }
+
+        // Add dictionary
+        const summary = {
+            title: dictionaryTitle,
+            revision: index.revision,
+            sequenced: index.sequenced,
+            version,
+            prefixWildcardsSupported
+        };
+
+        database.bulkAdd('dictionaries', [summary], 0, 1);
+
+        // Add data
+        const errors = [];
+        const total = (
+            termList.length +
+            termMetaList.length +
+            kanjiList.length +
+            kanjiMetaList.length +
+            tagList.length
+        );
+        let loadedCount = 0;
+        const maxTransactionLength = 1000;
+
+        const bulkAdd = async (objectStoreName, entries) => {
+            const ii = entries.length;
+            for (let i = 0; i < ii; i += maxTransactionLength) {
+                const count = Math.min(maxTransactionLength, ii - i);
+
+                try {
+                    await database.bulkAdd(objectStoreName, entries, i, count);
+                } catch (e) {
+                    errors.push(e);
+                }
+
+                loadedCount += count;
+                if (hasOnProgress) {
+                    onProgress(total, loadedCount);
+                }
+            }
+        };
+
+        await bulkAdd('terms', termList);
+        await bulkAdd('termMeta', termMetaList);
+        await bulkAdd('kanji', kanjiList);
+        await bulkAdd('kanjiMeta', kanjiMetaList);
+        await bulkAdd('tagMeta', tagList);
+
+        return {result: summary, errors};
+    }
+
+    async _getSchema(fileName) {
+        let schemaPromise = this._schemas.get(fileName);
+        if (typeof schemaPromise !== 'undefined') {
+            return schemaPromise;
+        }
+
+        schemaPromise = requestJson(chrome.runtime.getURL(fileName), 'GET');
+        this._schemas.set(fileName, schemaPromise);
+        return schemaPromise;
+    }
+
+    _validateJsonSchema(value, schema, fileName) {
+        try {
+            JsonSchema.validate(value, schema);
+        } catch (e) {
+            throw this._formatSchemaError(e, fileName);
+        }
+    }
+
+    _formatSchemaError(e, fileName) {
+        const valuePathString = this._getSchemaErrorPathString(e.info.valuePath, 'dictionary');
+        const schemaPathString = this._getSchemaErrorPathString(e.info.schemaPath, 'schema');
+
+        const e2 = new Error(`Dictionary has invalid data in '${fileName}' for value '${valuePathString}', validated against '${schemaPathString}': ${e.message}`);
+        e2.data = e;
+
+        return e2;
+    }
+
+    _getSchemaErrorPathString(infoList, base='') {
+        let result = base;
+        for (const [part] of infoList) {
+            switch (typeof part) {
+                case 'string':
+                    if (result.length > 0) {
+                        result += '.';
+                    }
+                    result += part;
+                    break;
+                case 'number':
+                    result += `[${part}]`;
+                    break;
+            }
+        }
+        return result;
+    }
+
+    _getDataBankSchemaPaths(version) {
+        const termBank = (
+            version === 1 ?
+            '/bg/data/dictionary-term-bank-v1-schema.json' :
+            '/bg/data/dictionary-term-bank-v3-schema.json'
+        );
+        const termMetaBank = '/bg/data/dictionary-term-meta-bank-v3-schema.json';
+        const kanjiBank = (
+            version === 1 ?
+            '/bg/data/dictionary-kanji-bank-v1-schema.json' :
+            '/bg/data/dictionary-kanji-bank-v3-schema.json'
+        );
+        const kanjiMetaBank = '/bg/data/dictionary-kanji-meta-bank-v3-schema.json';
+        const tagBank = '/bg/data/dictionary-tag-bank-v3-schema.json';
+
+        return [termBank, termMetaBank, kanjiBank, kanjiMetaBank, tagBank];
+    }
+}