Add offline spell-checking

src/espells.ts

@@ -0,0 +1,45 @@
+import {Language, SpellChecker, Suggestion} from "@/spellChecker";
+import { Espells } from "espells"
+
+export class ESpellChecker implements SpellChecker {
+
+    spellchecker: Espells
+    loadedLanguages: Language[]
+
+    constructor(languages: {aff: string, dic: string, language: Language}[]) {
+        this.spellchecker = new Espells({aff: languages[0].aff, dic: languages.map(l => l.dic)})
+        this.loadedLanguages = languages.map(l => l.language)
+    }
+
+    async check(text: string, _: string[]): Promise<Suggestion[]> {
+
+        let suggestions: Suggestion[] = []
+
+        const regex =   /[\w']+/g;
+        let match;
+
+        while ((match = regex.exec(text)) !== null) {
+            const word = match[0];
+            const counter = match.index;
+            const {correct} = this.spellchecker.lookup(word)
+            if(!correct) {
+                const hsSuggestions = this.spellchecker.suggest(word)
+                    suggestions.push({
+                        typeName: "UnknownWord",
+                        message: word,
+                        shortMessage: "Misspelled word",
+                        replacements: hsSuggestions,
+                        offset: counter,
+                        length: word.length
+                    })
+            }
+        }
+
+        return suggestions
+    }
+
+    async getLanguages(): Promise<Language[]> {
+        return this.loadedLanguages
+    }
+
+}