Reverted to local copies of Tesseract trainddata in order to remain self-contained.

src/core/operations/OpticalCharacterRecognition.mjs

@@ -12,6 +12,7 @@ import { isImage } from "../lib/FileType.mjs";
 import { toBase64 } from "../lib/Base64.mjs";
 import { isWorkerEnvironment } from "../Utils.mjs";
 
+import process from "process";
 import { createWorker } from "tesseract.js";
 
 /**
@@ -36,78 +37,6 @@ class OpticalCharacterRecognition extends Operation {
                 name: "Show confidence",
                 type: "boolean",
                 value: true
-            },
-            {
-                name: "Language",
-                type: "editableOptionShort",
-                value: [
-                    { name: "Afrikaans", value: "afr" },
-                    { name: "Arabic", value: "ara" },
-                    { name: "Azerbaijani", value: "aze" },
-                    { name: "Belarusian", value: "bel" },
-                    { name: "Bengali", value: "ben" },
-                    { name: "Bulgarian", value: "bul" },
-                    { name: "Catalan", value: "cat" },
-                    { name: "Czech", value: "ces" },
-                    { name: "Chinese", value: "chi_sim" },
-                    { name: "Traditional Chinese", value: "chi_tra" },
-                    { name: "Cherokee", value: "chr" },
-                    { name: "Danish", value: "dan" },
-                    { name: "German", value: "deu" },
-                    { name: "Greek", value: "ell" },
-                    { name: "English", value: "eng" },
-                    { name: "English (Old)", value: "enm" },
-                    { name: "Internet Meme", value: "meme" },
-                    { name: "Esperanto", value: "epo" },
-                    { name: "Esperanto alternative", value: "epo_alt" },
-                    { name: "Estonian", value: "est" },
-                    { name: "Basque", value: "eus" },
-                    { name: "Finnish", value: "fin" },
-                    { name: "French", value: "fra" },
-                    { name: "Frankish", value: "frk" },
-                    { name: "French (Old)", value: "frm" },
-                    { name: "Galician", value: "glg" },
-                    { name: "Ancient Greek", value: "grc" },
-                    { name: "Hebrew", value: "heb" },
-                    { name: "Hindi", value: "hin" },
-                    { name: "Croatian", value: "hrv" },
-                    { name: "Hungarian", value: "hun" },
-                    { name: "Indonesian", value: "ind" },
-                    { name: "Icelandic", value: "isl" },
-                    { name: "Italian", value: "ita" },
-                    { name: "Italian (Old)", value: "ita_old" },
-                    { name: "Japanese", value: "jpn" },
-                    { name: "Kannada", value: "kan" },
-                    { name: "Korean", value: "kor" },
-                    { name: "Latvian", value: "lav" },
-                    { name: "Lithuanian", value: "lit" },
-                    { name: "Malayalam", value: "mal" },
-                    { name: "Macedonian", value: "mkd" },
-                    { name: "Maltese", value: "mlt" },
-                    { name: "Malay", value: "msa" },
-                    { name: "Dutch", value: "nld" },
-                    { name: "Norwegian", value: "nor" },
-                    { name: "Polish", value: "pol" },
-                    { name: "Portuguese", value: "por" },
-                    { name: "Romanian", value: "ron" },
-                    { name: "Russian", value: "rus" },
-                    { name: "Slovakian", value: "slk" },
-                    { name: "Slovenian", value: "slv" },
-                    { name: "Spanish", value: "spa" },
-                    { name: "Old Spanish", value: "spa_old" },
-                    { name: "Albanian", value: "sqi" },
-                    { name: "Serbian (Latin)", value: "srp" },
-                    { name: "Swahili", value: "swa" },
-                    { name: "Swedish", value: "swe" },
-                    { name: "Tamil", value: "tam" },
-                    { name: "Telugu", value: "tel" },
-                    { name: "Tagalog", value: "tgl" },
-                    { name: "Thai", value: "tha" },
-                    { name: "Turkish", value: "tur" },
-                    { name: "Ukrainian", value: "ukr" },
-                    { name: "Vietnamese", value: "vie" },
-                ],
-                defaultIndex: 14
             }
         ];
     }
@@ -118,19 +47,24 @@ class OpticalCharacterRecognition extends Operation {
      * @returns {string}
      */
     async run(input, args) {
-        const [showConfidence, language] = args;
+        const [showConfidence] = args;
 
         if (!isWorkerEnvironment()) throw new OperationError("This operation only works in a browser");
 
         const type = isImage(input);
         if (!type) {
-            throw new OperationError("Unsupported file type (supported: jpg,png,pbm,bmp) or no file provided\nOpen an image as input using the toolbar.");
+            throw new OperationError("Unsupported file type (supported: jpg,png,pbm,bmp) or no file provided");
         }
 
+        const assetDir = isWorkerEnvironment() ? `${self.docURL}/assets/` : `${process.cwd()}/src/core/vendor/`;
+
         try {
             self.sendStatusMessage("Spinning up Tesseract worker...");
             const image = `data:${type};base64,${toBase64(input)}`;
             const worker = createWorker({
+                workerPath: `${assetDir}tesseract/worker.min.js`,
+                langPath: `${assetDir}tesseract/lang-data`,
+                corePath: `${assetDir}tesseract/tesseract-core.wasm.js`,
                 logger: progress => {
                     if (isWorkerEnvironment()) {
                         self.sendStatusMessage(`Status: ${progress.status}${progress.status === "recognizing text" ? ` - ${(parseFloat(progress.progress)*100).toFixed(2)}%`: "" }`);
@@ -138,10 +72,10 @@ class OpticalCharacterRecognition extends Operation {
                 }
             });
             await worker.load();
-            self.sendStatusMessage(`Loading ${language} language pack...`);
-            await worker.loadLanguage(language);
+            self.sendStatusMessage(`Loading English language pack...`);
+            await worker.loadLanguage("eng");
             self.sendStatusMessage("Intialising Tesseract API...");
-            await worker.initialize(language);
+            await worker.initialize("eng");
             self.sendStatusMessage("Finding text...");
             const result = await worker.recognize(image);