From c2d31e3a65d22fe501046a49fc304e9fe9f99d7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adina=20=C8=9Aeudan?= <adina.teudan.ext@knecon.com>
Date: Thu, 21 Sep 2023 00:27:43 +0300
Subject: [PATCH] RED-7571: Highlight and autocomplete drools keywords

---
 .../rules-screen/rules-screen.component.ts    | 36 ++++++++++++++-
 .../red-domain/src/lib/shared/editor.types.ts | 45 +++++++++++++++++++
 libs/red-domain/src/lib/shared/index.ts       |  1 +
 3 files changed, 80 insertions(+), 2 deletions(-)
 create mode 100644 libs/red-domain/src/lib/shared/editor.types.ts

diff --git a/apps/red-ui/src/app/modules/admin/screens/rules/rules-screen/rules-screen.component.ts b/apps/red-ui/src/app/modules/admin/screens/rules/rules-screen/rules-screen.component.ts
index a97a56f44..862110d60 100644
--- a/apps/red-ui/src/app/modules/admin/screens/rules/rules-screen/rules-screen.component.ts
+++ b/apps/red-ui/src/app/modules/admin/screens/rules/rules-screen/rules-screen.component.ts
@@ -3,7 +3,7 @@ import { PermissionsService } from '@services/permissions.service';
 import { IconButtonTypes, LoadingService, Toaster } from '@iqser/common-ui';
 import { RulesService } from '../../../services/rules.service';
 import { firstValueFrom } from 'rxjs';
-import { DOSSIER_TEMPLATE_ID, IRules } from '@red/domain';
+import { DOSSIER_TEMPLATE_ID, DroolsKeywords, IRules } from '@red/domain';
 import { EditorThemeService } from '@services/editor-theme.service';
 import { ComponentCanDeactivate } from '@guards/can-deactivate.guard';
 import { Debounce, getParam } from '@iqser/common-ui/lib/utils';
@@ -80,12 +80,13 @@ export class RulesScreenComponent implements OnInit, ComponentCanDeactivate {
         await this._initialize();
     }
 
-    onCodeEditorInit(editor: ICodeEditor) {
+    async onCodeEditorInit(editor: ICodeEditor): Promise<void> {
         this._codeEditor = editor;
         for (const theme of this._editorThemeService.themes) {
             (window as any).monaco.editor.defineTheme(theme, this._editorThemeService.configurations[theme]);
         }
         (window as any).monaco.editor.setTheme(this._editorThemeService.getTheme(true));
+        await this._configureSyntaxHighlighting();
         this._changeDetectorRef.detectChanges();
     }
 
@@ -130,6 +131,37 @@ export class RulesScreenComponent implements OnInit, ComponentCanDeactivate {
         this._loadingService.stop();
     }
 
+    private async _configureSyntaxHighlighting() {
+        const languages = (window as any).monaco.languages.getLanguages();
+        const javaLang = languages.find(l => l.id === 'java');
+        const { language: config } = await javaLang.loader();
+        DroolsKeywords.forEach(k => {
+            if (!config.keywords.includes(k)) {
+                config.keywords.push(k);
+            }
+        });
+        console.log({ config });
+
+        monaco.languages.registerCompletionItemProvider('java', {
+            provideCompletionItems: (model, position) => {
+                const word = model.getWordUntilPosition(position);
+                const range = {
+                    startLineNumber: position.lineNumber,
+                    endLineNumber: position.lineNumber,
+                    startColumn: word.startColumn,
+                    endColumn: word.endColumn,
+                };
+                const suggestions = config.keywords.map(k => ({
+                    label: k,
+                    kind: monaco.languages.CompletionItemKind.Keyword,
+                    insertText: k,
+                    range,
+                }));
+                return { suggestions };
+            },
+        });
+    }
+
     private _isNew(entry: string): boolean {
         return this.initialLines.indexOf(entry) < 0 && entry?.trim().length > 0;
     }
diff --git a/libs/red-domain/src/lib/shared/editor.types.ts b/libs/red-domain/src/lib/shared/editor.types.ts
new file mode 100644
index 000000000..77fbb0278
--- /dev/null
+++ b/libs/red-domain/src/lib/shared/editor.types.ts
@@ -0,0 +1,45 @@
+// https://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html/ch05.html#d0e2854
+
+export const DroolsKeywords = [
+    'lock-on-active',
+    'date-effective',
+    'date-expires',
+    'no-loop',
+    'auto-focus',
+    'activation-group',
+    'agenda-group',
+    'ruleflow-group',
+    'entry-point',
+    'duration',
+    'package',
+    'import',
+    'dialect',
+    'salience',
+    'enabled',
+    'attributes',
+    'rule',
+    'extend',
+    'when',
+    'then',
+    'template',
+    'query',
+    'declare',
+    'function',
+    'global',
+    'eval',
+    'not',
+    'in',
+    'or',
+    'and',
+    'exists',
+    'forall',
+    'accumulate',
+    'collect',
+    'from',
+    'action',
+    'reverse',
+    'result',
+    'end',
+    'over',
+    'init',
+];
diff --git a/libs/red-domain/src/lib/shared/index.ts b/libs/red-domain/src/lib/shared/index.ts
index b6973f8bf..8406e4be7 100644
--- a/libs/red-domain/src/lib/shared/index.ts
+++ b/libs/red-domain/src/lib/shared/index.ts
@@ -12,3 +12,4 @@ export * from './charts';
 export * from './app-config';
 export * from './system-preferences';
 export * from './component-rules';
+export * from './editor.types';