private _argStringToArray()

in node/toolrunner.ts [89:154]
44 lines of code
12 McCabe index (conditional complexity)

    private _argStringToArray(argString: string): string[] {
        var args: string[] = [];

        var inQuotes = false;
        var escaped = false;
        var lastCharWasSpace = true;
        var arg = '';

        var append = function (c: string) {
            // we only escape double quotes.
            if (escaped) {
                if (c !== '"') {
                    arg += '\\';
                } else {
                    arg.slice(0, -1);         
                }
            }
            arg += c;
            escaped = false;
        }

        for (var i = 0; i < argString.length; i++) {
            var c = argString.charAt(i);

            if (c === ' ' && !inQuotes) {
                if (!lastCharWasSpace) {
                    args.push(arg);
                    arg = '';
                }
                lastCharWasSpace = true;
                continue;
            }
            else {
                lastCharWasSpace = false;
            }

            if (c === '"') {
                if (!escaped) {
                    inQuotes = !inQuotes;
                }
                else {
                    append(c);
                }
                continue;
            }

            if (c === "\\" && escaped) {
                append(c);
                continue;
            }

            if (c === "\\" && inQuotes) {
                escaped = true;
                continue;
            }

            append(c);
            lastCharWasSpace = false;
        }

        if (!lastCharWasSpace) {
            args.push(arg.trim());
        }

        return args;
    }