From 16593408981d59e1bd3ad4de14071f45a8116d81 Mon Sep 17 00:00:00 2001
From: toasted-nutbread <toasted-nutbread@users.noreply.github.com>
Date: Sat, 23 Nov 2019 21:48:24 -0500
Subject: Add support for prefix wildcards

---
 ext/bg/js/database.js   | 30 +++++++++++++++++++++++-------
 ext/bg/js/search.js     | 10 +++++++---
 ext/bg/js/translator.js |  8 ++++----
 ext/mixed/js/core.js    |  4 ++++
 4 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index a20d5f15..2d309f85 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -28,7 +28,7 @@ class Database {
         }
 
         try {
-            this.db = await Database.open('dict', 4, (db, transaction, oldVersion) => {
+            this.db = await Database.open('dict', 5, (db, transaction, oldVersion) => {
                 Database.upgrade(db, transaction, oldVersion, [
                     {
                         version: 2,
@@ -76,6 +76,15 @@ class Database {
                                 indices: ['dictionary', 'expression', 'reading', 'sequence']
                             }
                         }
+                    },
+                    {
+                        version: 5,
+                        stores: {
+                            terms: {
+                                primaryKey: {keyPath: 'id', autoIncrement: true},
+                                indices: ['dictionary', 'expression', 'reading', 'sequence', 'expressionReverse', 'readingReverse']
+                            }
+                        }
                     }
                 ]);
             });
@@ -143,14 +152,17 @@ class Database {
             }
         };
 
+        const useWildcard = !!wildcard;
+        const prefixWildcard = wildcard === 'prefix';
+
         const dbTransaction = this.db.transaction(['terms'], 'readonly');
         const dbTerms = dbTransaction.objectStore('terms');
-        const dbIndex1 = dbTerms.index('expression');
-        const dbIndex2 = dbTerms.index('reading');
+        const dbIndex1 = dbTerms.index(prefixWildcard ? 'expressionReverse' : 'expression');
+        const dbIndex2 = dbTerms.index(prefixWildcard ? 'readingReverse' : 'reading');
 
         for (let i = 0; i < termList.length; ++i) {
-            const term = termList[i];
-            const query = wildcard ? IDBKeyRange.bound(term, `${term}\uffff`, false, false) : IDBKeyRange.only(term);
+            const term = prefixWildcard ? stringReverse(termList[i]) : termList[i];
+            const query = useWildcard ? IDBKeyRange.bound(term, `${term}\uffff`, false, false) : IDBKeyRange.only(term);
             promises.push(
                 Database.getAll(dbIndex1, query, i, processRow),
                 Database.getAll(dbIndex2, query, i, processRow)
@@ -377,7 +389,9 @@ class Database {
                         rules,
                         score,
                         glossary,
-                        dictionary: summary.title
+                        dictionary: summary.title,
+                        expressionReverse: stringReverse(expression),
+                        readingReverse: stringReverse(reading)
                     });
                 }
             } else {
@@ -391,7 +405,9 @@ class Database {
                         glossary,
                         sequence,
                         termTags,
-                        dictionary: summary.title
+                        dictionary: summary.title,
+                        expressionReverse: stringReverse(expression),
+                        readingReverse: stringReverse(reading)
                     });
                 }
             }
diff --git a/ext/bg/js/search.js b/ext/bg/js/search.js
index d2e0fd56..67a78075 100644
--- a/ext/bg/js/search.js
+++ b/ext/bg/js/search.js
@@ -207,10 +207,14 @@ class DisplaySearch extends Display {
     async onSearchQueryUpdated(query, animate) {
         try {
             const details = {};
-            const match = /[*\uff0a]+$/.exec(query);
+            const match = /^([*\uff0a]*)([\w\W]*?)([*\uff0a]*)$/.exec(query);
             if (match !== null) {
-                details.wildcard = true;
-                query = query.substring(0, query.length - match[0].length);
+                if (match[1]) {
+                    details.wildcard = 'prefix';
+                } else if (match[3]) {
+                    details.wildcard = 'suffix';
+                }
+                query = match[2];
             }
 
             const valid = (query.length > 0);
diff --git a/ext/bg/js/translator.js b/ext/bg/js/translator.js
index 202014c9..0f3d0aa0 100644
--- a/ext/bg/js/translator.js
+++ b/ext/bg/js/translator.js
@@ -230,7 +230,7 @@ class Translator {
         const titles = Object.keys(dictionaries);
         const deinflections = (
             details.wildcard ?
-            await this.findTermWildcard(text, titles) :
+            await this.findTermWildcard(text, titles, details.wildcard) :
             await this.findTermDeinflections(text, titles)
         );
 
@@ -268,8 +268,8 @@ class Translator {
         return [definitions, length];
     }
 
-    async findTermWildcard(text, titles) {
-        const definitions = await this.database.findTermsBulk([text], titles, true);
+    async findTermWildcard(text, titles, wildcard) {
+        const definitions = await this.database.findTermsBulk([text], titles, wildcard);
         if (definitions.length === 0) {
             return [];
         }
@@ -308,7 +308,7 @@ class Translator {
             deinflectionArray.push(deinflection);
         }
 
-        const definitions = await this.database.findTermsBulk(uniqueDeinflectionTerms, titles, false);
+        const definitions = await this.database.findTermsBulk(uniqueDeinflectionTerms, titles, null);
 
         for (const definition of definitions) {
             const definitionRules = Deinflector.rulesToRuleFlags(definition.rules);
diff --git a/ext/mixed/js/core.js b/ext/mixed/js/core.js
index f0c04457..b9536391 100644
--- a/ext/mixed/js/core.js
+++ b/ext/mixed/js/core.js
@@ -118,6 +118,10 @@ function toIterable(value) {
     throw new Error('Could not convert to iterable');
 }
 
+function stringReverse(string) {
+    return string.split('').reverse().join('').replace(/([\uDC00-\uDFFF])([\uD800-\uDBFF])/g, '$2$1');
+}
+
 
 /*
  * Async utilities
-- 
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