gdscript: allow color picking

Implement `DocumentColorProvider` by extracting Color expressions,
interpreting them, and replacing arguments in place when possible.

Author: paul-marechal

package.json

@@ -375,6 +375,21 @@
 					"type": "boolean",
 					"default": true,
 					"description": "Whether to enable inlay hints in GDResource (.tscn, .tres, etc) files"
+				},
+				"godotTools.colorPicker.precision": {
+					"type": "integer",
+					"default": 3,
+					"description": "Amount of decimals to include when using the color picker. 0 for arbitrary precision."
+				},
+				"godotTools.colorPicker.padValues": {
+					"type": "boolean",
+					"default": false,
+					"description": "Write either 1.2 (unpadded) or either 1.200 (padded)."
+				},
+				"godotTools.colorPicker.uppercaseHex": {
+					"type": "boolean",
+					"default": false,
+					"description": "Write either 0x008b8bff or either 0x008B8BFF."
 				}
 			}
 		},

src/extension.ts

@@ -5,6 +5,7 @@ import { attemptSettingsUpdate, get_extension_uri, clean_godot_path } from "./ut
 import {
 	GDInlayHintsProvider,
 	GDHoverProvider,
+	GDDocumentColorProvider,
 	GDDocumentDropEditProvider,
 	GDDocumentLinkProvider,
 	GDSemanticTokensProvider,
@@ -37,6 +38,7 @@ interface Extension {
 	lsp?: ClientConnectionManager;
 	debug?: GodotDebugger;
 	scenePreviewProvider?: ScenePreviewProvider;
+	colorProvider?: GDDocumentColorProvider;
 	linkProvider?: GDDocumentLinkProvider;
 	dropsProvider?: GDDocumentDropEditProvider;
 	hoverProvider?: GDHoverProvider;
@@ -58,6 +60,7 @@ export function activate(context: vscode.ExtensionContext) {
 	globals.lsp = new ClientConnectionManager(context);
 	globals.debug = new GodotDebugger(context);
 	globals.scenePreviewProvider = new ScenePreviewProvider(context);
+	globals.colorProvider = new GDDocumentColorProvider(context);
 	globals.linkProvider = new GDDocumentLinkProvider(context);
 	globals.dropsProvider = new GDDocumentDropEditProvider(context);
 	globals.hoverProvider = new GDHoverProvider(context);
@@ -101,14 +104,14 @@ async function initial_setup() {
 			break;
 		}
 		case "WRONG_VERSION": {
-			const message = `The specified Godot executable, '${godotPath}' is the wrong version. 
+			const message = `The specified Godot executable, '${godotPath}' is the wrong version.
 				The current project uses Godot v${projectVersion}, but the specified executable is Godot v${result.version}.
 				Extension features will not work correctly unless this is fixed.`;
 			prompt_for_godot_executable(message, settingName);
 			break;
 		}
 		case "INVALID_EXE": {
-			const message = `The specified Godot executable, '${godotPath}' is invalid. 
+			const message = `The specified Godot executable, '${godotPath}' is invalid.
 				Extension features will not work correctly unless this is fixed.`;
 			prompt_for_godot_executable(message, settingName);
 			break;