feat: add proper fallback and saf uri handling for ischeck (Acode-Foundation#1814)

Author: bajrangCoder

src/lib/editorFile.js

@@ -612,39 +612,55 @@ export default class EditorFile {
 		const protocol = Url.getProtocol(this.#uri);
 		const text = this.session.getValue();
 
+		// Helper for JS-based comparison (used as fallback)
+		const jsCompare = async (fileUri) => {
+			const fs = fsOperation(fileUri);
+			const oldText = await fs.readFile(this.encoding);
+			return await system.compareTexts(oldText, text);
+		};
+
 		if (/s?ftp:/.test(protocol)) {
-			// if file is a ftp or sftp file, get file content from cached file.
-			// remove ':' from protocol because cache file of remote files are
-			// stored as ftp102525465N i.e. protocol + id
-			// Cache files are local file:// URIs, so native file reading works
+			// FTP/SFTP files use cached local file
 			const cacheFilename = protocol.slice(0, -1) + this.id;
 			const cacheFileUri = Url.join(CACHE_STORAGE, cacheFilename);
 
 			try {
 				return await system.compareFileText(cacheFileUri, this.encoding, text);
 			} catch (error) {
-				console.error("Native compareFileText failed:", error);
-				return false;
+				console.error(
+					"Native compareFileText failed, using JS fallback:",
+					error,
+				);
+				try {
+					return await jsCompare(cacheFileUri);
+				} catch (fallbackError) {
+					console.error(fallbackError);
+					return false;
+				}
 			}
 		}
 
 		if (/^(file|content):/.test(protocol)) {
-			// file:// and content:// URIs can be handled by native Android code
-			// Native reads file AND compares in background thread
+			// file:// and content:// URIs - try native first, fallback to JS
 			try {
 				return await system.compareFileText(this.uri, this.encoding, text);
 			} catch (error) {
-				console.error("Native compareFileText failed:", error);
-				return false;
+				console.error(
+					"Native compareFileText failed, using JS fallback:",
+					error,
+				);
+				try {
+					return await jsCompare(this.uri);
+				} catch (fallbackError) {
+					console.error(fallbackError);
+					return false;
+				}
 			}
 		}
 
+		// Other protocols - JS reads file, native compares strings
 		try {
-			const fs = fsOperation(this.uri);
-			const oldText = await fs.readFile(this.encoding);
-
-			// Offload string comparison to background thread
-			return await system.compareTexts(oldText, text);
+			return await jsCompare(this.uri);
 		} catch (error) {
 			console.error(error);
 			return false;

src/plugins/system/android/com/foxdebug/system/System.java

@@ -89,6 +89,7 @@
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.net.Uri;
+import android.provider.DocumentsContract;
 import android.provider.Settings;
 
 import androidx.core.content.ContextCompat;
@@ -681,11 +682,32 @@ private void compareFileText(
                 Path path = file.toPath();
                 fileContent = new String(Files.readAllBytes(path), charset);
 
-            } else {
-                // Handle content:// URIs
+            } else if ("content".equalsIgnoreCase(uri.getScheme())) {
+                // Handle content:// URIs (including SAF tree URIs)
                 InputStream inputStream = null;
                 try {
-                    inputStream = context.getContentResolver().openInputStream(uri);
+                    String uriString = fileUri;
+                    Uri resolvedUri = uri;
+                    
+                    // Check if this is a SAF tree URI with :: separator
+                    if (uriString.contains("::")) {
+                        try {
+                            // Split into tree URI and document ID
+                            String[] parts = uriString.split("::", 2);
+                            String treeUriStr = parts[0];
+                            String docId = parts[1];
+                            
+                            // Build document URI directly from tree URI and document ID
+                            Uri treeUri = Uri.parse(treeUriStr);
+                            resolvedUri = DocumentsContract.buildDocumentUriUsingTree(treeUri, docId);
+                        } catch (Exception e) {
+                            callback.error("SAF_FALLBACK: Invalid SAF URI format - " + e.getMessage());
+                            return;
+                        }
+                    }
+                    
+                    // Try to open the resolved URI
+                    inputStream = context.getContentResolver().openInputStream(resolvedUri);
 
                     if (inputStream == null) {
                         callback.error("Cannot open file");
@@ -710,6 +732,9 @@ private void compareFileText(
                         } catch (IOException ignored) {}
                     }
                 }
+            } else {
+                callback.error("Unsupported URI scheme: " + uri.getScheme());
+                return;
             }
 
             // check length first