private getErrorsForConfigUI()

in Extension/src/LanguageServer/configurations.ts [1365:1459]
74 lines of code
26 McCabe index (conditional complexity)

    private getErrorsForConfigUI(configIndex: number): ConfigurationErrors {
        const errors: ConfigurationErrors = {};
        if (!this.configurationJson) {
            return errors;
        }
        const isWindows: boolean = os.platform() === 'win32';
        const config: Configuration = this.configurationJson.configurations[configIndex];

        // Check if config name is unique.
        errors.name = this.isConfigNameUnique(config.name);

        // Validate compilerPath
        let resolvedCompilerPath: string | undefined = this.resolvePath(config.compilerPath, isWindows);
        const compilerPathAndArgs: util.CompilerPathAndArgs = util.extractCompilerPathAndArgs(resolvedCompilerPath);
        if (resolvedCompilerPath
            // Don't error cl.exe paths because it could be for an older preview build.
            && compilerPathAndArgs.compilerName.toLowerCase() !== "cl.exe"
            && compilerPathAndArgs.compilerName.toLowerCase() !== "cl") {
            resolvedCompilerPath = resolvedCompilerPath.trim();

            // Error when the compiler's path has spaces without quotes but args are used.
            // Except, exclude cl.exe paths because it could be for an older preview build.
            const compilerPathNeedsQuotes: boolean =
                (compilerPathAndArgs.additionalArgs && compilerPathAndArgs.additionalArgs.length > 0) &&
                !resolvedCompilerPath.startsWith('"') &&
                compilerPathAndArgs.compilerPath !== undefined &&
                compilerPathAndArgs.compilerPath.includes(" ");

            const compilerPathErrors: string[] = [];
            if (compilerPathNeedsQuotes) {
                compilerPathErrors.push(localize("path.with.spaces", 'Compiler path with spaces and arguments is missing double quotes " around the path.'));
            }

            // Get compiler path without arguments before checking if it exists
            resolvedCompilerPath = compilerPathAndArgs.compilerPath;
            if (resolvedCompilerPath) {
                let pathExists: boolean = true;
                const existsWithExeAdded: (path: string) => boolean = (path: string) => isWindows && !path.startsWith("/") && fs.existsSync(path + ".exe");
                if (!fs.existsSync(resolvedCompilerPath)) {
                    if (existsWithExeAdded(resolvedCompilerPath)) {
                        resolvedCompilerPath += ".exe";
                    } else if (!this.rootUri) {
                        pathExists = false;
                    } else {
                        // Check again for a relative path.
                        const relativePath: string = this.rootUri.fsPath + path.sep + resolvedCompilerPath;
                        if (!fs.existsSync(relativePath)) {
                            if (existsWithExeAdded(resolvedCompilerPath)) {
                                resolvedCompilerPath += ".exe";
                            } else {
                                pathExists = false;
                            }
                        } else {
                            resolvedCompilerPath = relativePath;
                        }
                    }
                }

                if (!pathExists) {
                    const message: string = localize('cannot.find', "Cannot find: {0}", resolvedCompilerPath);
                    compilerPathErrors.push(message);
                } else if (compilerPathAndArgs.compilerPath === "") {
                    const message: string = localize("cannot.resolve.compiler.path", "Invalid input, cannot resolve compiler path");
                    compilerPathErrors.push(message);
                } else if (!util.checkFileExistsSync(resolvedCompilerPath)) {
                    const message: string = localize("path.is.not.a.file", "Path is not a file: {0}", resolvedCompilerPath);
                    compilerPathErrors.push(message);
                }

                if (compilerPathErrors.length > 0) {
                    errors.compilerPath = compilerPathErrors.join('\n');
                }
            }
        }

        // Validate paths (directories)
        errors.includePath = this.validatePath(config.includePath);
        errors.macFrameworkPath = this.validatePath(config.macFrameworkPath);
        errors.browsePath = this.validatePath(config.browse ? config.browse.path : undefined);

        // Validate files
        errors.forcedInclude = this.validatePath(config.forcedInclude, false, true);
        errors.compileCommands = this.validatePath(config.compileCommands, false);
        errors.databaseFilename = this.validatePath((config.browse ? config.browse.databaseFilename : undefined), false);

        // Validate intelliSenseMode
        if (isWindows) {
            const intelliSenesModeError: string = this.validateIntelliSenseMode(config);
            if (intelliSenesModeError.length > 0) {
                errors.intelliSenseMode = intelliSenesModeError;
            }
        }

        return errors;
    }