#373 - Arabic diacritics

src/search/query.ts

@@ -13,9 +13,9 @@ export class Query {
   }
   #inQuotes: string[]
 
-  constructor(text = '', options: { ignoreDiacritics: boolean }) {
+  constructor(text = '', options: { ignoreDiacritics: boolean, ignoreArabicDiacritics: boolean}) {
     if (options.ignoreDiacritics) {
-      text = removeDiacritics(text)
+      text = removeDiacritics(text, options.ignoreArabicDiacritics)
     }
     const parsed = parse(text.toLowerCase(), {
       tokenize: true,

src/search/search-engine.ts

@@ -304,7 +304,12 @@ export class SearchEngine {
         const title = document?.path.toLowerCase() ?? ''
         const content = (document?.cleanedContent ?? '').toLowerCase()
         return exactTerms.every(
-          q => content.includes(q) || removeDiacritics(title).includes(q)
+          q =>
+            content.includes(q) ||
+            removeDiacritics(
+              title,
+              this.plugin.settings.ignoreArabicDiacritics
+            ).includes(q)
         )
       })
     }
@@ -434,7 +439,7 @@ export class SearchEngine {
       },
       processTerm: (term: string) =>
         (this.plugin.settings.ignoreDiacritics
-          ? removeDiacritics(term)
+          ? removeDiacritics(term, this.plugin.settings.ignoreArabicDiacritics)
           : term
         ).toLowerCase(),
       idField: 'path',

src/settings.ts

@@ -32,6 +32,8 @@ export interface OmnisearchSettings extends WeightingSettings {
   downrankedFoldersFilters: string[]
   /** Ignore diacritics when indexing files */
   ignoreDiacritics: boolean
+  ignoreArabicDiacritics: boolean
+
   /** Extensions of plain text files to index, in addition to .md */
   indexedFileTypes: string[]
   /** Enable PDF indexing */
@@ -661,6 +663,17 @@ export class SettingsTab extends PluginSettingTab {
         })
       )
 
+      new Setting(containerEl)
+      .setName('Ignore Arabic diacritics (beta)')
+      .setDesc(diacriticsDesc)
+      .addToggle(toggle =>
+        toggle.setValue(settings.ignoreArabicDiacritics).onChange(async v => {
+          await database.clearCache()
+          settings.ignoreArabicDiacritics = v
+          await saveSettings(this.plugin)
+        })
+      )
+
     // Disable Omnisearch
     const disableDesc = new DocumentFragment()
     disableDesc.createSpan({}, span => {
@@ -720,6 +733,7 @@ export function getDefaultSettings(app: App): OmnisearchSettings {
     hideExcluded: false,
     downrankedFoldersFilters: [] as string[],
     ignoreDiacritics: true,
+    ignoreArabicDiacritics: false,
     indexedFileTypes: [] as string[],
     PDFIndexing: false,
     officeIndexing: false,

src/tools/text-processing.ts

@@ -115,7 +115,7 @@ export class TextProcessor {
     const originalText = text
     // text = text.toLowerCase().replace(new RegExp(SEPARATORS, 'gu'), ' ')
     if (this.plugin.settings.ignoreDiacritics) {
-      text = removeDiacritics(text)
+      text = removeDiacritics(text, this.plugin.settings.ignoreArabicDiacritics)
     }
     const startTime = new Date().getTime()
     let match: RegExpExecArray | null = null

src/tools/utils.ts

@@ -109,15 +109,30 @@ export function getTagsFromMetadata(metadata: CachedMetadata | null): string[] {
 /**
  * https://stackoverflow.com/a/37511463
  */
-export function removeDiacritics(str: string): string {
-  // Japanese diacritics that should be distinguished
-  const excludeDiacritics: string[] = ['\\u30FC', '\\u309A', '\\u3099']
-  const regexpExclude: string = excludeDiacritics.join('|')
-  const regexp: RegExp = new RegExp(`(?!${regexpExclude})\\p{Diacritic}`, 'gu')
-
+export function removeDiacritics(str: string, arabic = false): string {
   if (str === null || str === undefined) {
     return ''
   }
+
+  // Japanese diacritics that should be distinguished
+  const japaneseDiacritics: string[] = ['\\u30FC', '\\u309A', '\\u3099']
+  const regexpExclude: string = japaneseDiacritics.join('|')
+  const regexp: RegExp = new RegExp(`(?!${regexpExclude})\\p{Diacritic}`, 'gu')
+
+  if (arabic) {
+    // Arabic diacritics
+    // https://stackoverflow.com/a/40959537
+    str = str
+      .replace(/([^\u0621-\u063A\u0641-\u064A\u0660-\u0669a-zA-Z 0-9])/g, '')
+      .replace(/(آ|إ|أ)/g, 'ا')
+      .replace(/(ة)/g, 'ه')
+      .replace(/(ئ|ؤ)/g, 'ء')
+      .replace(/(ى)/g, 'ي')
+    for (let i = 0; i < 10; i++) {
+      str.replace(String.fromCharCode(0x660 + i), String.fromCharCode(48 + i))
+    }
+  }
+
   // Keep backticks for code blocks, because otherwise they are removed by the .normalize() function
   // https://stackoverflow.com/a/36100275
   str = str.replaceAll('`', '[__omnisearch__backtick__]')