protected scopesRequest()

in src/debugAdapter/goDebug.ts [1501:1662]
150 lines of code
22 McCabe index (conditional complexity)

	protected scopesRequest(response: DebugProtocol.ScopesResponse, args: DebugProtocol.ScopesArguments): void {
		log('ScopesRequest');
		// TODO(polinasok): this.stackFrameHandles.get should succeed as long as DA
		// clients behaves well. Find the documentation around stack frame management
		// and in case of a failure caused by misbehavior, consider to indicate it
		// in the error response.
		const [goroutineId, frameId] = this.stackFrameHandles.get(args.frameId);
		const listLocalVarsIn = { goroutineID: goroutineId, frame: frameId };
		this.delve.call<DebugVariable[] | ListVarsOut>(
			'ListLocalVars',
			this.delve.isApiV1 ? [listLocalVarsIn] : [{ scope: listLocalVarsIn, cfg: this.delve.loadConfig }],
			(err, out) => {
				if (err) {
					this.logDelveError(err, 'Failed to get list local variables');
					return this.sendErrorResponse(response, 2005, 'Unable to list locals: "{e}"', {
						e: err.toString()
					});
				}
				const locals = this.delve.isApiV1 ? <DebugVariable[]>out : (<ListVarsOut>out).Variables;
				log('locals', locals);
				this.addFullyQualifiedName(locals);
				const listLocalFunctionArgsIn = { goroutineID: goroutineId, frame: frameId };
				this.delve.call<DebugVariable[] | ListFunctionArgsOut>(
					'ListFunctionArgs',
					this.delve.isApiV1
						? [listLocalFunctionArgsIn]
						: [{ scope: listLocalFunctionArgsIn, cfg: this.delve.loadConfig }],
					(listFunctionErr, outArgs) => {
						if (listFunctionErr) {
							this.logDelveError(listFunctionErr, 'Failed to list function args');
							return this.sendErrorResponse(response, 2006, 'Unable to list args: "{e}"', {
								e: listFunctionErr.toString()
							});
						}
						const vars = this.delve.isApiV1
							? <DebugVariable[]>outArgs
							: (<ListFunctionArgsOut>outArgs).Args;
						log('functionArgs', vars);
						this.addFullyQualifiedName(vars);
						vars.push(...locals);
						// annotate shadowed variables in parentheses
						const shadowedVars = new Map<string, Array<number>>();
						for (let i = 0; i < vars.length; ++i) {
							if ((vars[i].flags & GoVariableFlags.VariableShadowed) === 0) {
								continue;
							}
							const varName = vars[i].name;
							if (!shadowedVars.has(varName)) {
								const indices = new Array<number>();
								indices.push(i);
								shadowedVars.set(varName, indices);
							} else {
								shadowedVars.get(varName).push(i);
							}
						}
						for (const svIndices of shadowedVars.values()) {
							// sort by declared line number in descending order
							svIndices.sort((lhs: number, rhs: number) => {
								return vars[rhs].DeclLine - vars[lhs].DeclLine;
							});
							// enclose in parentheses, one pair per scope
							for (let scope = 0; scope < svIndices.length; ++scope) {
								const svIndex = svIndices[scope];
								// start at -1 so scope of 0 has one pair of parens
								for (let count = -1; count < scope; ++count) {
									vars[svIndex].name = `(${vars[svIndex].name})`;
								}
							}
						}
						const scopes = new Array<Scope>();
						const localVariables: DebugVariable = {
							name: 'Local',
							addr: 0,
							type: '',
							realType: '',
							kind: 0,
							flags: 0,
							onlyAddr: false,
							DeclLine: 0,
							value: '',
							len: 0,
							cap: 0,
							children: vars,
							unreadable: '',
							fullyQualifiedName: '',
							base: 0
						};

						scopes.push(new Scope('Local', this.variableHandles.create(localVariables), false));
						response.body = { scopes };

						if (!this.showGlobalVariables) {
							this.sendResponse(response);
							log('ScopesResponse');
							return;
						}

						this.getPackageInfo(this.debugState).then((packageName) => {
							if (!packageName) {
								this.sendResponse(response);
								log('ScopesResponse');
								return;
							}
							const filter = `^${packageName}\\.`;
							this.delve.call<DebugVariable[] | ListVarsOut>(
								'ListPackageVars',
								this.delve.isApiV1 ? [filter] : [{ filter, cfg: this.delve.loadConfig }],
								(listPkgVarsErr, listPkgVarsOut) => {
									if (listPkgVarsErr) {
										this.logDelveError(listPkgVarsErr, 'Failed to list global vars');
										return this.sendErrorResponse(
											response,
											2007,
											'Unable to list global vars: "{e}"',
											{ e: listPkgVarsErr.toString() }
										);
									}
									const globals = this.delve.isApiV1
										? <DebugVariable[]>listPkgVarsOut
										: (<ListVarsOut>listPkgVarsOut).Variables;
									let initdoneIndex = -1;
									for (let i = 0; i < globals.length; i++) {
										globals[i].name = globals[i].name.substr(packageName.length + 1);
										if (initdoneIndex === -1 && globals[i].name === this.initdone) {
											initdoneIndex = i;
										}
									}
									if (initdoneIndex > -1) {
										globals.splice(initdoneIndex, 1);
									}
									log('global vars', globals);

									const globalVariables: DebugVariable = {
										name: 'Global',
										addr: 0,
										type: '',
										realType: '',
										kind: 0,
										flags: 0,
										onlyAddr: false,
										DeclLine: 0,
										value: '',
										len: 0,
										cap: 0,
										children: globals,
										unreadable: '',
										fullyQualifiedName: '',
										base: 0
									};
									scopes.push(
										new Scope('Global', this.variableHandles.create(globalVariables), false)
									);
									this.sendResponse(response);
									log('ScopesResponse');
								}
							);
						});
					}
				);
			}
		);
	}