Query Manager

dashboards-observability/.gitignore

@@ -4,3 +4,4 @@ build/
 coverage/
 .cypress/screenshots
 .cypress/videos
+common/query_manager/antlr/output

dashboards-observability/common/query_manager/antlr/adaptors/case_insensitive_char_stream.ts

@@ -0,0 +1,60 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { CharStream } from 'antlr4ts';
+
+export class CaseInsensitiveCharStream {
+  private stream: CharStream;
+
+  get index(): number {
+    return this.stream.index;
+  }
+
+  get size(): number {
+    return this.stream.size;
+  }
+
+  get sourceName(): string {
+    return 'pplquery';
+  }
+
+  constructor(stream: CharStream) {
+    this.stream = stream;
+  }
+
+  LA(offset: number): number {
+    const c: number = this.stream.LA(offset);
+    if (c <= 0) {
+      return c;
+    }
+
+    // case insensitivity support for PPL
+    return String.fromCodePoint(c).toUpperCase().codePointAt(0)!;
+  }
+
+  consume(): void {
+    this.stream.consume();
+  }
+
+  mark(): number {
+    return this.stream.mark();
+  }
+
+  release(marker: number): void {
+    this.stream.release(marker);
+  }
+
+  seek(index: number): void {
+    this.stream.seek(index);
+  }
+
+  getText(interval: any): string {
+    return this.stream.getText(interval);
+  }
+
+  toString(): string {
+    return this.stream.toString();
+  }
+}