Change @... completion items

In addition to removing the _SYMBOL appendix also convert the AT_ prefix to @.

Change-Id: I97179084043f1177a958e11d57ca2450df15707b

Author: mike-lischke

gui/frontend/src/parsing/mysql/MySQLCodeCompletion.ts

@@ -695,6 +695,11 @@ export const getCodeCompletionItems = (caretLine: number, caretOffset: number, d
             entry = unquote(entry);
         }
 
+        // Second step to build a usable entry string is to check for certain MRS tokens, which start with `AT_`.
+        if (entry.startsWith("AT_")) {
+            entry = "@" + entry.substring(3);
+        }
+
         let isFunction = false;
         if (candidate[1].length > 0) {
             // A function call?

gui/frontend/src/parsing/worker/RdbmsLanguageService.ts

@@ -144,20 +144,27 @@ export class RdbmsLanguageService {
 
             this.pool.runTask(infoData).then((taskId: number, result: ILanguageWorkerResultData): void => {
                 if (!model.isDisposed() && result.completions) {
-                    const info = model.getWordUntilPosition(position);
+                    // Determine what has been written so far, by going back from the current position until we find
+                    // a whitespace character or the start of the line.
+                    const line = model.getLineContent(position.lineNumber);
+                    let index = position.column - 1;
+                    while (index > 0 && !/\s/.test(line[index - 1])) {
+                        --index;
+                    }
+
                     const replaceRange = context.fromLocal({
                         startLineNumber: position.lineNumber,
-                        startColumn: info.startColumn,
+                        startColumn: index + 1,
                         endLineNumber: position.lineNumber,
-                        endColumn: info.endColumn,
+                        endColumn: position.column,
                     });
 
                     this.transformCompletionItems(result.completions, replaceRange).then((suggestions) => {
                         if (suggestions.length === 0) {
                             // Add a special item here if nothing was found.
                             // Otherwise we get some meaningless default suggestions.
                             suggestions.push({
-                                label: "No Suggestions.",
+                                label: "No Suggestions",
                                 kind: languages.CompletionItemKind.Text,
                                 range: replaceRange,
                                 insertText: "",