Move DataDescription utility to flipper-plugin

Summary:
Another utility component used by DataInspector.

Colors have been hardcoded for now, to decouple from the classic Flipper color palette. Will organize this better later in this stack, and when addressing / adding support for dark mode.

Buttons, checkboxes, selects have been replaced by Antd's counterpart.

Unlike ManagedDataTable, the DataInspector is primarily moved rather than copied & adapted, as the underlying abstraction / API won't change significantly. So the changes here will immediately affect all plugins in Flipper using this component.

Reviewed By: passy

Differential Revision: D27603126

fbshipit-source-id: bacd48c9af2b591033e7f2352627f11acb4df589

desktop/flipper-plugin/src/utils/parseColor.tsx

@@ -0,0 +1,67 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+export function parseColor(
+  val: string | number,
+):
+  | {
+      r: number;
+      g: number;
+      b: number;
+      a: number;
+    }
+  | undefined
+  | null {
+  if (typeof val === 'number') {
+    const a = ((val >> 24) & 0xff) / 255;
+    const r = (val >> 16) & 0xff;
+    const g = (val >> 8) & 0xff;
+    const b = val & 0xff;
+    return {a, b, g, r};
+  }
+  if (typeof val !== 'string') {
+    return;
+  }
+  if (val[0] !== '#') {
+    return;
+  }
+
+  // remove leading hash
+  val = val.slice(1);
+
+  // only allow RGB and ARGB hex values
+  if (val.length !== 3 && val.length !== 6 && val.length !== 8) {
+    return;
+  }
+
+  // split every 2 characters
+  const parts = val.match(/.{1,2}/g);
+  if (!parts) {
+    return;
+  }
+
+  // get the alpha value
+  let a = 1;
+
+  // extract alpha if passed AARRGGBB
+  if (val.length === 8) {
+    a = parseInt(parts.shift() || '0', 16) / 255;
+  }
+
+  const size = val.length;
+  const [r, g, b] = parts.map((num) => {
+    if (size === 3) {
+      return parseInt(num + num, 16);
+    } else {
+      return parseInt(num, 16);
+    }
+  });
+
+  return {a, b, g, r};
+}