MrClay\Cli::validate PHP Method

    public function validate()
    {
        $options = '';
        $this->errors = array();
        $this->values = array();
        $this->_stdin = null;
        if ($this->isHelpRequest) {
            return false;
        }
        $lettersUsed = '';
        foreach ($this->_args as $letter => $arg) {
            /* @var Arg $arg  */
            $options .= $letter;
            $lettersUsed .= $letter;
            if ($arg->mayHaveValue || $arg->mustHaveValue) {
                $options .= $arg->mustHaveValue ? ':' : '::';
            }
        }
        $this->debug['argv'] = $GLOBALS['argv'];
        $argvCopy = array_slice($GLOBALS['argv'], 1);
        $o = getopt($options);
        $this->debug['getopt_options'] = $options;
        $this->debug['getopt_return'] = $o;
        foreach ($this->_args as $letter => $arg) {
            /* @var Arg $arg  */
            $this->values[$letter] = false;
            if (isset($o[$letter])) {
                if (is_bool($o[$letter])) {
                    // remove from argv copy
                    $k = array_search("-{$letter}", $argvCopy);
                    if ($k !== false) {
                        array_splice($argvCopy, $k, 1);
                    }
                    if ($arg->mustHaveValue) {
                        $this->addError($letter, "Missing value");
                    } else {
                        $this->values[$letter] = true;
                    }
                } else {
                    // string
                    $this->values[$letter] = $o[$letter];
                    $v =& $this->values[$letter];
                    // remove from argv copy
                    // first look for -ovalue or -o=value
                    $pattern = "/^-{$letter}=?" . preg_quote($v, '/') . "\$/";
                    $foundInArgv = false;
                    foreach ($argvCopy as $k => $argV) {
                        if (preg_match($pattern, $argV)) {
                            array_splice($argvCopy, $k, 1);
                            $foundInArgv = true;
                            break;
                        }
                    }
                    if (!$foundInArgv) {
                        // space separated
                        $k = array_search("-{$letter}", $argvCopy);
                        if ($k !== false) {
                            array_splice($argvCopy, $k, 2);
                        }
                    }
                    // check that value isn't really another option
                    if (strlen($lettersUsed) > 1) {
                        $pattern = "/^-[" . str_replace($letter, '', $lettersUsed) . "]/i";
                        if (preg_match($pattern, $v)) {
                            $this->addError($letter, "Value was read as another option: %s", $v);
                            return false;
                        }
                    }
                    if ($arg->assertFile || $arg->assertDir) {
                        if ($v[0] !== '/' && $v[0] !== '~') {
                            $this->values["{$letter}.raw"] = $v;
                            $v = getcwd() . "/{$v}";
                        }
                    }
                    if ($arg->assertFile) {
                        if ($arg->useAsInfile) {
                            $this->_stdin = $v;
                        } elseif ($arg->useAsOutfile) {
                            $this->_stdout = $v;
                        }
                        if ($arg->assertReadable && !is_readable($v)) {
                            $this->addError($letter, "File not readable: %s", $v);
                            continue;
                        }
                        if ($arg->assertWritable) {
                            if (is_file($v)) {
                                if (!is_writable($v)) {
                                    $this->addError($letter, "File not writable: %s", $v);
                                }
                            } else {
                                if (!is_writable(dirname($v))) {
                                    $this->addError($letter, "Directory not writable: %s", dirname($v));
                                }
                            }
                        }
                    } elseif ($arg->assertDir && $arg->assertWritable && !is_writable($v)) {
                        $this->addError($letter, "Directory not readable: %s", $v);
                    }
                }
            } else {
                if ($arg->isRequired()) {
                    $this->addError($letter, "Missing");
                }
            }
        }
        $this->moreArgs = $argvCopy;
        reset($this->moreArgs);
        return empty($this->errors);
    }