protected variablesRequest()

in src/debugAdapter/goDebug.ts [1679:1765]
82 lines of code
12 McCabe index (conditional complexity)

	protected variablesRequest(
		response: DebugProtocol.VariablesResponse,
		args: DebugProtocol.VariablesArguments
	): void {
		log('VariablesRequest');
		const vari = this.variableHandles.get(args.variablesReference);
		let variablesPromise: Promise<DebugProtocol.Variable[]> | undefined;
		const loadChildren = async (exp: string, v: DebugVariable) => {
			// from https://github.com/go-delve/delve/blob/master/Documentation/api/ClientHowto.md#looking-into-variables
			if (
				(v.kind === GoReflectKind.Struct && v.len > v.children.length) ||
				(v.kind === GoReflectKind.Interface && v.children.length > 0 && v.children[0].onlyAddr === true)
			) {
				await this.evaluateRequestImpl({ expression: exp }).then(
					(result) => {
						const variable = this.delve?.isApiV1 ? <DebugVariable>result : (<EvalOut>result).Variable;
						v.children = variable.children;
					},
					(err) => this.logDelveError(err, 'Failed to evaluate expression')
				);
			}
		};
		// expressions passed to loadChildren defined per
		// https://github.com/go-delve/delve/blob/master/Documentation/api/ClientHowto.md#loading-more-of-a-variable
		if (vari.kind === GoReflectKind.Array || vari.kind === GoReflectKind.Slice) {
			variablesPromise = Promise.all(
				vari.children.map((v, i) => {
					return loadChildren(`*(*"${v.type}")(${v.addr})`, v).then(
						(): DebugProtocol.Variable => {
							const { result, variablesReference } = this.convertDebugVariableToProtocolVariable(v);
							return {
								name: '[' + i + ']',
								value: result,
								evaluateName: vari.fullyQualifiedName + '[' + i + ']',
								variablesReference
							};
						}
					);
				})
			);
		} else if (vari.kind === GoReflectKind.Map) {
			variablesPromise = Promise.all(
				vari.children
					.map((_, i) => {
						// even indices are map keys, odd indices are values
						if (i % 2 === 0 && i + 1 < vari.children.length) {
							const mapKey = this.convertDebugVariableToProtocolVariable(vari.children[i]);
							return loadChildren(
								`${vari.fullyQualifiedName}.${vari.name}[${mapKey.result}]`,
								vari.children[i + 1]
							).then(() => {
								const mapValue = this.convertDebugVariableToProtocolVariable(vari.children[i + 1]);
								return {
									name: mapKey.result,
									value: mapValue.result,
									evaluateName: vari.fullyQualifiedName + '[' + mapKey.result + ']',
									variablesReference: mapValue.variablesReference
								} as DebugProtocol.Variable;
							});
						}
					})
					.filter((v): v is Promise<DebugProtocol.Variable> => !!v) // remove the null values created by combining keys and values
			);
		} else {
			variablesPromise = Promise.all(
				vari.children.map((v) => {
					return loadChildren(`*(*"${v.type}")(${v.addr})`, v).then(
						(): DebugProtocol.Variable => {
							const { result, variablesReference } = this.convertDebugVariableToProtocolVariable(v);

							return {
								name: v.name,
								value: result,
								evaluateName: v.fullyQualifiedName,
								variablesReference
							};
						}
					);
				})
			);
		}
		variablesPromise.then((variables) => {
			response.body = { variables };
			this.sendResponse(response);
			log('VariablesResponse', JSON.stringify(variables, null, ' '));
		});
	}