feat: add template extraction and composition utilities in json-templates

packages/core/json-templates/src/utils/index.ts

@@ -0,0 +1,44 @@
+/**
+ * This file is part of the NocoBase (R) project.
+ * Copyright (c) 2020-2024 NocoBase Co., Ltd.
+ * Authors: NocoBase Team.
+ *
+ * This project is dual-licensed under AGPL-3.0 and NocoBase Commercial License.
+ * For more information, please refer to: https://www.nocobase.com/agreement.
+ */
+
+import { escapeSpecialChars, escape, revertEscape } from '../escape';
+import engine from '../engine';
+
+type Filter = {
+  name: string;
+  handler: any;
+  args: string[];
+};
+
+export function extractTemplateElements(template: string) {
+  const escapedTemplate = escape(template ?? '');
+  const fullVariable = engine.fullVariablesSync(escapeSpecialChars(escapedTemplate))[0] ?? '';
+  const variableSegments = engine.variableSegmentsSync(escapedTemplate)[0] ?? [];
+  const parsedTemplate = engine.parse(escapedTemplate)[0] ?? {};
+
+  const filters =
+    //@ts-ignore
+    parsedTemplate?.value?.filters?.map(({ name, handler, args }) => ({
+      name,
+      handler,
+      args: args.map((arg) => arg.content),
+    })) ?? [];
+
+  return revertEscape({ fullVariable, variableSegments, filters });
+}
+
+const composeFilterTemplate = (filter: Filter) => {
+  return `${filter.name}${filter.args.length ? `:${filter.args.join(',')}` : ''}`;
+};
+
+export const composeTemplate = ({ fullVariable, filters }: { fullVariable: string; filters: any[] }) => {
+  const filtersTemplate = filters.map(composeFilterTemplate).join(' | ');
+  const innerTemplateStr = [fullVariable, filtersTemplate].filter(Boolean).join(' | ');
+  return `{{${innerTemplateStr}}}`;
+};