1 files changed, 297 insertions, 0 deletions
diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
new file mode 100644
index 00000000..7ad7d410
--- /dev/null
+++ b/ext/bg/js/database.js
@@ -0,0 +1,297 @@
+/*
+ * Copyright (C) 2016  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 <http://www.gnu.org/licenses/>.
+ */
+
+
+class Database {
+    constructor() {
+        this.db = null;
+        this.tagMetaCache = {};
+    }
+
+    prepare() {
+        if (this.db !== null) {
+            return Promise.reject('database already initialized');
+        }
+
+        this.db = new Dexie('dict');
+        this.db.version(1).stores({
+            terms: '++id,dictionary,expression,reading',
+            kanji: '++,dictionary,character',
+            tagMeta: '++,dictionary',
+            dictionaries: '++,title,version',
+        });
+
+        return this.db.open();
+    }
+
+    purge() {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        this.db.close();
+        return this.db.delete().then(() => {
+            this.db = null;
+            this.tagMetaCache = {};
+            return this.prepare();
+        });
+    }
+
+    findTerm(term, dictionaries) {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        const results = [];
+        return this.db.terms.where('expression').equals(term).or('reading').equals(term).each(row => {
+            if (dictionaries.includes(row.dictionary)) {
+                results.push({
+                    expression: row.expression,
+                    reading: row.reading,
+                    tags: splitField(row.tags),
+                    rules: splitField(row.rules),
+                    glossary: row.glossary,
+                    score: row.score,
+                    dictionary: row.dictionary,
+                    id: row.id
+                });
+            }
+        }).then(() => {
+            return this.cacheTagMeta(dictionaries);
+        }).then(() => {
+            for (const result of results) {
+                result.tagMeta = this.tagMetaCache[result.dictionary] || {};
+            }
+
+            return results;
+        });
+    }
+
+    findKanji(kanji, dictionaries) {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        const results = [];
+        return this.db.kanji.where('character').equals(kanji).each(row => {
+            if (dictionaries.includes(row.dictionary)) {
+                results.push({
+                    character: row.character,
+                    onyomi: splitField(row.onyomi),
+                    kunyomi: splitField(row.kunyomi),
+                    tags: splitField(row.tags),
+                    glossary: row.meanings,
+                    dictionary: row.dictionary
+                });
+            }
+        }).then(() => {
+            return this.cacheTagMeta(dictionaries);
+        }).then(() => {
+            for (const result of results) {
+                result.tagMeta = this.tagMetaCache[result.dictionary] || {};
+            }
+
+            return results;
+        });
+    }
+
+    cacheTagMeta(dictionaries) {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        const promises = [];
+        for (const dictionary of dictionaries) {
+            if (this.tagMetaCache[dictionary]) {
+                continue;
+            }
+
+            const tagMeta = {};
+            promises.push(
+                this.db.tagMeta.where('dictionary').equals(dictionary).each(row => {
+                    tagMeta[row.name] = {category: row.category, notes: row.notes, order: row.order};
+                }).then(() => {
+                    this.tagMetaCache[dictionary] = tagMeta;
+                })
+            );
+        }
+
+        return Promise.all(promises);
+    }
+
+    getDictionaries() {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        return this.db.dictionaries.toArray();
+    }
+
+    deleteDictionary(title, callback) {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        return this.db.dictionaries.where('title').equals(title).first(info => {
+            if (!info) {
+                return;
+            }
+
+            let termCounter = Promise.resolve(0);
+            if (info.hasTerms) {
+                termCounter = this.db.terms.where('dictionary').equals(title).count();
+            }
+
+            let kanjiCounter = Promise.resolve(0);
+            if (info.hasKanji) {
+                kanjiCounter = this.db.kanji.where('dictionary').equals(title).count();
+            }
+
+            return Promise.all([termCounter, kanjiCounter]).then(([termCount, kanjiCount]) => {
+                const rowLimit = 500;
+                const totalCount = termCount + kanjiCount;
+                let deletedCount = 0;
+
+                let termDeleter = Promise.resolve();
+                if (info.hasTerms) {
+                    const termDeleterFunc = () => {
+                        return this.db.terms.where('dictionary').equals(title).limit(rowLimit).delete().then(count => {
+                            if (count === 0) {
+                                return Promise.resolve();
+                            }
+
+                            deletedCount += count;
+                            if (callback) {
+                                callback(totalCount, deletedCount);
+                            }
+
+                            return termDeleterFunc();
+                        });
+                    };
+
+                    termDeleter = termDeleterFunc();
+                }
+
+                let kanjiDeleter = Promise.resolve();
+                if (info.hasKanji) {
+                    const kanjiDeleterFunc = () => {
+                        return this.db.kanji.where('dictionary').equals(title).limit(rowLimit).delete().then(count => {
+                            if (count === 0) {
+                                return Promise.resolve();
+                            }
+
+                            deletedCount += count;
+                            if (callback) {
+                                callback(totalCount, deletedCount);
+                            }
+
+                            return kanjiDeleterFunc();
+                        });
+                    };
+
+                    kanjiDeleter = kanjiDeleterFunc();
+                }
+
+                return Promise.all([termDeleter, kanjiDeleter]);
+            });
+        }).then(() => {
+            return this.db.tagMeta.where('dictionary').equals(title).delete();
+        }).then(() => {
+            return this.db.dictionaries.where('title').equals(title).delete();
+        }).then(() => {
+            delete this.cacheTagMeta[title];
+        });
+    }
+
+    importDictionary(indexUrl, callback) {
+        if (this.db === null) {
+            return Promise.reject('database not initialized');
+        }
+
+        let summary = null;
+        const indexLoaded = (title, version, tagMeta, hasTerms, hasKanji) => {
+            summary = {title, hasTerms, hasKanji, version};
+            return this.db.dictionaries.where('title').equals(title).count().then(count => {
+                if (count > 0) {
+                    return Promise.reject(`dictionary "${title}" is already imported`);
+                }
+
+                return this.db.dictionaries.add({title, version, hasTerms, hasKanji}).then(() => {
+                    const rows = [];
+                    for (const tag in tagMeta || {}) {
+                        const meta = tagMeta[tag];
+                        const row = sanitizeTag({
+                            name: tag,
+                            category: meta.category,
+                            notes: meta.notes,
+                            order: meta.order,
+                            dictionary: title
+                        });
+
+                        rows.push(row);
+                    }
+
+                    return this.db.tagMeta.bulkAdd(rows);
+                });
+            });
+        };
+
+        const termsLoaded = (title, entries, total, current) => {
+            const rows = [];
+            for (const [expression, reading, tags, rules, score, ...glossary] of entries) {
+                rows.push({
+                    expression,
+                    reading,
+                    tags,
+                    rules,
+                    score,
+                    glossary,
+                    dictionary: title
+                });
+            }
+
+            return this.db.terms.bulkAdd(rows).then(() => {
+                if (callback) {
+                    callback(total, current, indexUrl);
+                }
+            });
+        };
+
+        const kanjiLoaded = (title, entries, total, current)  => {
+            const rows = [];
+            for (const [character, onyomi, kunyomi, tags, ...meanings] of entries) {
+                rows.push({
+                    character,
+                    onyomi,
+                    kunyomi,
+                    tags,
+                    meanings,
+                    dictionary: title
+                });
+            }
+
+            return this.db.kanji.bulkAdd(rows).then(() => {
+                if (callback) {
+                    callback(total, current, indexUrl);
+                }
+            });
+        };
+
+        return importJsonDb(indexUrl, indexLoaded, termsLoaded, kanjiLoaded).then(() => summary);
+    }
+}