Fix: Embedded language position updates properly

workspace.openTextDocument would not update the document when and new version get saved, which had for result to give a non-updated position.

client/src/language/utils.ts

@@ -3,17 +3,43 @@
  * Licensed under the MIT License. See License.txt in the project root for license information.
  * ------------------------------------------------------------------------------------------ */
 
-import { type TextDocument, type Position, workspace } from 'vscode'
+import fs from 'fs'
+
+import { type TextDocument, Position } from 'vscode'
 
 import { type EmbeddedLanguageDocInfos } from '../lib/src/types/embedded-languages'
+import { logger } from '../lib/src/utils/OutputLogger'
 
 export const getEmbeddedLanguageDocPosition = async (
   originalTextDocument: TextDocument,
   embeddedLanguageDocInfos: EmbeddedLanguageDocInfos,
   originalPosition: Position
-): Promise<Position> => {
+): Promise<Position | undefined> => {
   const originalOffset = originalTextDocument.offsetAt(originalPosition)
   const embeddedLanguageDocOffset = embeddedLanguageDocInfos.characterIndexes[originalOffset]
-  const embeddedLanguageDoc = await workspace.openTextDocument(embeddedLanguageDocInfos.uri.replace('file://', ''))
-  return embeddedLanguageDoc.positionAt(embeddedLanguageDocOffset)
+  try {
+    const embeddedLanguageDocContent = await new Promise<string>((resolve, reject) => {
+      fs.readFile(embeddedLanguageDocInfos.uri.replace('file://', ''), { encoding: 'utf-8' },
+        (error, data) => { error !== null ? reject(error) : resolve(data) }
+      )
+    })
+    return getPosition(embeddedLanguageDocContent, embeddedLanguageDocOffset)
+  } catch (error) {
+    logger.error(`Failed to get embedded language document position: ${error as any}`)
+    return undefined
+  }
+}
+
+const getPosition = (documentContent: string, offset: number): Position => {
+  let line = 0
+  let character = 0
+  for (let i = 0; i < offset; i++) {
+    if (documentContent[i] === '\n') {
+      line++
+      character = 0
+    } else {
+      character++
+    }
+  }
+  return new Position(line, character)
 }