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Code Editor : Shell.php

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/*
(c) 2006 Jan Kneschke <jan@kneschke.de>

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

/**
* A interactive PHP Shell
*
* The more I work with other languages like python and ruby I like their way how they
* work on problems. While PHP is very forgiving on errors, it is weak on the debugging
* side. It was missing a simple to use interactive shell for years. Python and Ruby have
* their ipython and iruby shell which give you a direct way to interact with the objects.
* No need to write a script and execute it afterwards.
*
* Starting the Shell:
*
* The package contains a shell wrapper for windows and unix:
* <pre>
* sh>  php-shell.sh
* win> php-shell
* </pre>
*
* Both are calling the wrapper script <code>php -q php-shell-cmd.php</code>
*
* Inline Help
*
* <pre>
* PHP-Shell - Version 0.2.0, with readline() support
* (c) 2006, Jan Kneschke <jan@kneschke.de>
*
* >> use '?' to open the inline help
*
* >> ?
* "inline help for the PHP-shell
*
*   >> ?
*     print this help
*   >> ? <topic>
*     get the doccomment for a class, method, property or function
*   >> p <var>
*     execute a verbose print (if implemented)
*   >> quit
*     leave shell
* "
* >> ? PHP_Shell
* </pre>
* Alternatives
*
* - http://david.acz.org/phpa/
* - http://www.hping.org/phpinteractive/
* - the embedded interactive php-shell: $ php -a
*
* @package PHP
*/

/**
* PHP_Shell
*
* a interactive PHP Shell with tab-completion and history
* it can catch FATAL errors before executing the code
*
* Extensions are provided through three side-classes:
*
* - PHP_Shell_Commands
* - PHP_Shell_Options
* - PHP_Shell_Extensions
*
* @package PHP
*/

require_once(dirname(__FILE__)."/Shell/Commands.php");
require_once(dirname(__FILE__)."/Shell/Options.php"); /* for the tab-complete */

class PHP_Shell {
    /**
    * current code-buffer
    * @var string
    */
    protected $code;

/**
    * set if readline support is enabled
    * @var bool
    */
    protected $have_readline;

/**
    * current version of the class
    * @var string
    */
    protected $version = '0.3.1';

/**
    *
    */
    protected $stdin;

protected $code_buffer;

public $has_semicolon=false;

/**
    * init the shell and change if readline support is available
    */
    public function __construct() {
        $this->code = '';

$this->stdin = null;

$this->have_readline = function_exists('readline');

if ($this->have_readline) {
            readline_completion_function('__shell_readline_complete');
        }

$this->use_readline = true;

$cmd = PHP_Shell_Commands::getInstance();

$cmd->registerCommand('#^quit$#', $this, 'cmdQuit', 'quit', 'leaves the shell');
        $cmd->registerCommand('#^\?$#', $this, 'cmdHelp', '?', 'show this help');
        $cmd->registerCommand('#^\?\s+license$#', $this, 'cmdLicense', '? license', 'show license of the shell');
    }

/**
    * parse the PHP code
    *
    * we parse before we eval() the code to
    * - fetch fatal errors before they come up
    * - know about where we have to wait for closing braces
    *
    * @return int 0 if a executable statement is in the code-buffer, non-zero otherwise
    */
    public function parse() {
        ## remove empty lines
        if (trim($this->code) == '') return 1;

$t = token_get_all('<?php '.$this->code.' ?>');

$need_semicolon = 1; /* do we need a semicolon to complete the statement ? */
        $need_return = 1;    /* can we prepend a return to the eval-string ? */
        $open_comment = 0;   /* a open multi-line comment */
        $eval = '';          /* code to be eval()'ed later */
        $braces = array();   /* to track if we need more closing braces */

$methods = array();  /* to track duplicate methods in a class declaration */
        $ts = array();       /* tokens without whitespaces */

foreach ($t as $ndx => $token) {
            if (is_array($token)) {
                $ignore = 0;

switch($token[0]) {
                case T_WHITESPACE:
                case T_OPEN_TAG:
                case T_CLOSE_TAG:
                    $ignore = 1;
                    break;
                case T_FOREACH:
                case T_DO:
                case T_WHILE:
                case T_FOR:

case T_IF:
                case T_RETURN:

case T_CLASS:
                case T_FUNCTION:
                case T_INTERFACE:

case T_PRINT:
                case T_ECHO:

case T_COMMENT:
                case T_UNSET:

case T_INCLUDE:
                case T_REQUIRE:
                case T_INCLUDE_ONCE:
                case T_REQUIRE_ONCE:
                case T_TRY:
                case T_SWITCH:
                case T_DEFAULT:
                case T_CASE:
                case T_BREAK:
                case T_DOC_COMMENT:
                    $need_return = 0;
                    break;
                case T_EMPTY:
                case T_ISSET:
                case T_EVAL:
                case T_EXIT:

case T_VARIABLE:
                case T_STRING:
                case T_NEW:
                case T_EXTENDS:
                case T_IMPLEMENTS:
                case T_OBJECT_OPERATOR:
                case T_DOUBLE_COLON:
                case T_INSTANCEOF:

case T_CATCH:
                case T_THROW:

case T_ELSE:
                case T_AS:
                case T_LNUMBER:
                case T_DNUMBER:
                case T_CONSTANT_ENCAPSED_STRING:
                case T_ENCAPSED_AND_WHITESPACE:
                case T_CHARACTER:
                case T_ARRAY:
                case T_DOUBLE_ARROW:

case T_CONST:
                case T_PUBLIC:
                case T_PROTECTED:
                case T_PRIVATE:
                case T_ABSTRACT:
                case T_STATIC:
                case T_VAR:

case T_INC:
                case T_DEC:
                case T_SL:
                case T_SL_EQUAL:
                case T_SR:
                case T_SR_EQUAL:

case T_IS_EQUAL:
                case T_IS_IDENTICAL:
                case T_IS_GREATER_OR_EQUAL:
                case T_IS_SMALLER_OR_EQUAL:

case T_BOOLEAN_OR:
                case T_LOGICAL_OR:
                case T_BOOLEAN_AND:
                case T_LOGICAL_AND:
                case T_LOGICAL_XOR:
                case T_MINUS_EQUAL:
                case T_PLUS_EQUAL:
                case T_MUL_EQUAL:
                case T_DIV_EQUAL:
                case T_MOD_EQUAL:
                case T_XOR_EQUAL:
                case T_AND_EQUAL:
                case T_OR_EQUAL:

case T_FUNC_C:
                case T_CLASS_C:
                case T_LINE:
                case T_FILE:

case T_BOOL_CAST:
                case T_INT_CAST:
                case T_STRING_CAST:

/* just go on */
                    break;
                default:
                    /* debug unknown tags*/
                    error_log(sprintf("unknown tag: %d (%s): %s".PHP_EOL, $token[0], token_name($token[0]), $token[1]));

break;
                }
                if (!$ignore) {
                    $eval .= $token[1]." ";
                    $ts[] = array("token" => $token[0], "value" => $token[1]);
                }
            } else {
                $ts[] = array("token" => $token, "value" => '');

$last = count($ts) - 1;

switch ($token) {
                case '(':
                    /* walk backwards through the tokens */

if ($last >= 4 &&
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_OBJECT_OPERATOR &&
                        $ts[$last - 3]['token'] == ')' ) {
                        /* func()->method()
                        *
                        * we can't know what func() is return, so we can't
                        * say if the method() exists or not
                        *
                        */
                    } else if ($last >= 3 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[0]['token'] != T_ABSTRACT && /* if we are not in a class definition */
                        $ts[1]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_OBJECT_OPERATOR &&
                        $ts[$last - 3]['token'] == T_VARIABLE ) {

/* $object->method( */

/* catch (Exception $e) does not set $e in $GLOBALS[] */
                        $in_catch = 0;

foreach ($ts as $v) {
                            if ($v['token'] == T_CATCH) {
                                $in_catch = 1;
                            }
                        }

if (!$in_catch) {
                            /* $object has to exist and has to be a object */
                            $objname = $ts[$last - 3]['value'];

if (!isset($GLOBALS[ltrim($objname, '$')])) {
                                throw new Exception(sprintf('Variable \'%s\' is not set', $objname));
                            }
                            $object = $GLOBALS[ltrim($objname, '$')];

if (!is_object($object)) {
                                throw new Exception(sprintf('Variable \'%s\' is not a class', $objname));
                            }

$method = $ts[$last - 1]['value'];

/* obj */

if (!method_exists($object, $method)) {
                                throw new Exception(sprintf("Variable %s (Class '%s') doesn't have a method named '%s'",
                                    $objname, get_class($object), $method));
                            }
                        }
                    } else if ($last >= 3 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_VARIABLE &&
                        $ts[$last - 2]['token'] == T_OBJECT_OPERATOR &&
                        $ts[$last - 3]['token'] == T_VARIABLE ) {

/* $object->$method( */

/* $object has to exist and has to be a object */
                        $objname = $ts[$last - 3]['value'];

if (!isset($GLOBALS[ltrim($objname, '$')])) {
                            throw new Exception(sprintf('Variable \'%s\' is not set', $objname));
                        }
                        $object = $GLOBALS[ltrim($objname, '$')];

if (!is_object($object)) {
                            throw new Exception(sprintf('Variable \'%s\' is not a class', $objname));
                        }

$methodname = $ts[$last - 1]['value'];

if (!isset($GLOBALS[ltrim($methodname, '$')])) {
                            throw new Exception(sprintf('Variable \'%s\' is not set', $methodname));
                        }
                        $method = $GLOBALS[ltrim($methodname, '$')];

/* obj */

} else if ($last >= 6 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_OBJECT_OPERATOR &&
                        $ts[$last - 3]['token'] == ']' &&
                            /* might be anything as index */
                        $ts[$last - 5]['token'] == '[' &&
                        $ts[$last - 6]['token'] == T_VARIABLE ) {

/* $object[...]->method( */

/* $object has to exist and has to be a object */
                        $objname = $ts[$last - 6]['value'];

if (!isset($GLOBALS[ltrim($objname, '$')])) {
                            throw new Exception(sprintf('Variable \'%s\' is not set', $objname));
                        }
                        $array = $GLOBALS[ltrim($objname, '$')];

if (!is_array($array)) {
                            throw new Exception(sprintf('Variable \'%s\' is not a array', $objname));
                        }

$andx = $ts[$last - 4]['value'];

if (!isset($array[$andx])) {
                            throw new Exception(sprintf('%s[\'%s\'] is not set', $objname, $andx));
                        }

$object = $array[$andx];

if (!is_object($object)) {
                            throw new Exception(sprintf('Variable \'%s\' is not a class', $objname));
                        }

$method = $ts[$last - 1]['value'];

/* obj */

} else if ($last >= 3 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_DOUBLE_COLON &&
                        $ts[$last - 3]['token'] == T_STRING ) {

/* Class::method() */

/* $object has to exist and has to be a object */
                        $classname = $ts[$last - 3]['value'];

if (!class_exists($classname)) {
                            throw new Exception(sprintf('Class \'%s\' doesn\'t exist', $classname));
                        }

$method = $ts[$last - 1]['value'];

if (!in_array($method, get_class_methods($classname))) {
                            throw new Exception(sprintf("Class '%s' doesn't have a method named '%s'",
                                $classname, $method));
                        }
                    } else if ($last >= 3 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_VARIABLE &&
                        $ts[$last - 2]['token'] == T_DOUBLE_COLON &&
                        $ts[$last - 3]['token'] == T_STRING ) {

/* $var::method() */

/* $object has to exist and has to be a object */
                        $classname = $ts[$last - 3]['value'];

if (!class_exists($classname)) {
                            throw new Exception(sprintf('Class \'%s\' doesn\'t exist', $classname));
                        }

$methodname = $ts[$last - 1]['value'];

if (!in_array($method, get_class_methods($classname))) {
                            throw new Exception(sprintf("Class '%s' doesn't have a method named '%s'",
                                $classname, $method));
                        }

} else if ($last >= 2 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_NEW ) {

/* new Class() */

/* don't care about this in a class ... { ... } */

$classname = $ts[$last - 1]['value'];

if (!class_exists($classname)) {
                            throw new Exception(sprintf('Class \'%s\' doesn\'t exist', $classname));
                        }

$r = new ReflectionClass($classname);

if ($r->isAbstract()) {
                            throw new Exception(sprintf("Can't instantiate abstract Class '%s'", $classname));
                        }

if (!$r->isInstantiable()) {
                            throw new Exception(sprintf('Class \'%s\' can\'t be instantiated. Is the class abstract ?', $classname));
                        }

} else if ($last >= 2 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_FUNCTION ) {

/* make sure we are not a in class definition */

/* function a() */

$func = $ts[$last - 1]['value'];

if (function_exists($func)) {
                            throw new Exception(sprintf('Function \'%s\' is already defined', $func));
                        }
                    } else if ($last >= 4 &&
                        $ts[0]['token'] == T_CLASS &&
                        $ts[1]['token'] == T_STRING &&
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_FUNCTION ) {

/* make sure we are not a in class definition */

/* class a { .. function a() ... } */

$func = $ts[$last - 1]['value'];
                        $classname = $ts[1]['value'];

if (isset($methods[$func])) {
                            throw new Exception(sprintf("Can't redeclare method '%s' in Class '%s'", $func, $classname));
                        }

$methods[$func] = 1;

} else if ($last >= 1 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[0]['token'] != T_ABSTRACT && /* if we are not in a class definition */
                        $ts[1]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_STRING ) {
                        /* func() */
                        $funcname = $ts[$last - 1]['value'];

if (!function_exists($funcname)) {
                            throw new Exception(sprintf("Function %s() doesn't exist", $funcname));
                        }
                    } else if ($last >= 1 &&
                        $ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_VARIABLE ) {

/* $object has to exist and has to be a object */
                        $funcname = $ts[$last - 1]['value'];

if (!isset($GLOBALS[ltrim($funcname, '$')])) {
                            throw new Exception(sprintf('Variable \'%s\' is not set', $funcname));
                        }
                        $func = $GLOBALS[ltrim($funcname, '$')];

if (!function_exists($func)) {
                            throw new Exception(sprintf("Function %s() doesn't exist", $func));
                        }

}

array_push($braces, $token);
                    break;
                case '{':
                    $need_return = 0;

if ($last >= 2 &&
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_CLASS ) {

/* class name { */

$classname = $ts[$last - 1]['value'];

if (class_exists($classname, false)) {
                            throw new Exception(sprintf("Class '%s' can't be redeclared", $classname));
                        }
                    } else if ($last >= 4 &&
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_EXTENDS &&
                        $ts[$last - 3]['token'] == T_STRING &&
                        $ts[$last - 4]['token'] == T_CLASS ) {

/* class classname extends classname { */

$classname = $ts[$last - 3]['value'];
                        $extendsname = $ts[$last - 1]['value'];

if (class_exists($classname, false)) {
                            throw new Exception(sprintf("Class '%s' can't be redeclared",
                                $classname));
                        }
                        if (!class_exists($extendsname, true)) {
                            throw new Exception(sprintf("Can't extend '%s' ... from not existing Class '%s'",
                                $classname, $extendsname));
                        }
                    } else if ($last >= 4 &&
                        $ts[$last - 1]['token'] == T_STRING &&
                        $ts[$last - 2]['token'] == T_IMPLEMENTS &&
                        $ts[$last - 3]['token'] == T_STRING &&
                        $ts[$last - 4]['token'] == T_CLASS ) {

/* class name implements interface { */

$classname = $ts[$last - 3]['value'];
                        $implements = $ts[$last - 1]['value'];

if (class_exists($classname, false)) {
                            throw new Exception(sprintf("Class '%s' can't be redeclared",
                                $classname));
                        }
                        if (!interface_exists($implements, false)) {
                            throw new Exception(sprintf("Can't implement not existing Interface '%s' for Class '%s'",
                                $implements, $classname));
                        }
                    }

array_push($braces, $token);
                    break;
                case '}':
                    $need_return = 0;
                case ')':
                    array_pop($braces);
                    break;
                case '[':
                    if ($ts[0]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[0]['token'] != T_ABSTRACT && /* if we are not in a class definition */
                        $ts[1]['token'] != T_CLASS && /* if we are not in a class definition */
                        $ts[$last - 1]['token'] == T_VARIABLE) {
                        /* $a[] only works on array and string */

/* $object has to exist and has to be a object */
                        $objname = $ts[$last - 1]['value'];

if (!isset($GLOBALS[ltrim($objname, '$')])) {
                            throw new Exception(sprintf('Variable \'%s\' is not set', $objname));
                        }
                        $obj = $GLOBALS[ltrim($objname, '$')];

if (is_object($obj)) {
                            throw new Exception(sprintf('Objects (%s) don\'t support array access operators', $objname));
                        }
                    }
                    break;
                }

$eval .= $token;
            }
        }

$last = count($ts) - 1;
        if ($last >= 2 &&
            $ts[$last - 0]['token'] == T_STRING &&
            $ts[$last - 1]['token'] == T_DOUBLE_COLON &&
            $ts[$last - 2]['token'] == T_STRING ) {

/* Class::constant */

/* $object has to exist and has to be a object */
            $classname = $ts[$last - 2]['value'];

if (!class_exists($classname)) {
                throw new Exception(sprintf('Class \'%s\' doesn\'t exist', $classname));
            }

$constname = $ts[$last - 0]['value'];

$c = new ReflectionClass($classname);
            if (!$c->hasConstant($constname)) {
                throw new Exception(sprintf("Class '%s' doesn't have a constant named '%s'",
                    $classname, $constname));
            }
        } else if ($last == 0 &&
            $ts[$last - 0]['token'] == T_VARIABLE ) {

/* $var */

$varname = $ts[$last - 0]['value'];

if (!isset($GLOBALS[ltrim($varname, '$')])) {
                throw new Exception(sprintf('Variable \'%s\' is not set', $varname));
            }
        }

$need_more = (count($braces) > 0) || $open_comment;

if ($need_more || ';' === $token) {
			$need_semicolon = 0;
        }

if ($need_return) {
            $eval = "return ".$eval;
        }

/* add a traling ; if necessary */
        if ($need_semicolon)
		{
			$this->has_semicolon = preg_match('/;\s*$/', $eval);
			$eval .= ';';
		}

if (!$need_more) {
            $this->code = $eval;
        }

return $need_more;
    }

/**
    * show the prompt and fetch a single line
    *
    * uses readline() if avaialbe
    *
    * @return string a input-line
    */
    public function readline() {
        if (empty($this->code)) print PHP_EOL;

$prompt = (empty($this->code)) ? '>> ' : '.. ';

if (count($this->code_buffer) > 0) {
            print $prompt;

$line = array_shift($this->code_buffer);

print $line.PHP_EOL;

return $line.PHP_EOL;
        }

if ($this->have_readline) {
            $l = readline($prompt);

readline_add_history($l);
        } else {
            print $prompt;

if (is_null($this->stdin)) {
                if (false === ($this->stdin = fopen("php://stdin", "r"))) {
                    return false;
                }
            }
            $l = fgets($this->stdin);
        }
        return $l;
    }

/**
    * get the inline help
    *
    * @return string the inline help as string
    */
    public function cmdHelp($l) {
        $o = 'Inline Help:'.PHP_EOL;

$cmds = PHP_Shell_Commands::getInstance()->getCommands();

$help = array();
        foreach ($cmds as $cmd) {
            $help[] = sprintf('  >> %s'.PHP_EOL.'    %s'.PHP_EOL,
                $cmd['command'],
                $cmd['description']
            );
        }

return var_export(implode("\n", $help), 1);
    }

/**
    * get the license string
    *
    * @return string the inline help as string
    */
    public function cmdLicense($l) {
        $o = <<<EOF
(c) 2006 Jan Kneschke <jan@kneschke.de>

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

return var_export($o, 1);
    }

/**
    * handle the 'quit' command
    *
    * @return bool false to leave the input() call
    * @see input
    */
    protected function cmdQuit($l) {
        return false;
    }

/**
    * handle the input line
    *
    * read the input and handle the commands of the shell
    *
    * @return bool false on 'quit' or EOF, true otherwise
    */
    public function input() {
        $l = $this->readline();

/* got EOF ? */
        if (false === $l) return false;

$l = trim($l);

if (empty($this->code)) {
            $this->verbose = 0;

$cmds = PHP_Shell_Commands::getInstance()->getCommands();

foreach ($cmds as $cmd) {
                if (preg_match($cmd['regex'], $l)) {
                    $obj = $cmd['obj'];
                    $func = $cmd['method'];

if (false === ($l = $obj->$func($l))) {
                        ## quit
                        return false;
                    }

if (is_array($l)) {
                        $this->code_buffer = $l;
                        $l = '';
                    }
                    break;
                }
            }
        }

$this->appendCode($l);

return true;
    }

/**
    * get the code-buffer
    *
    * @return string the code-buffer
    */
    public function getCode() {
		return $this->code;
        return $code;
    }

/**
    * reset the code-buffer
    */
    public function resetCode() {
		$this->has_semicolon=false;
        $this->code = '';
    }

/**
    * append code to the code-buffer
    *
    * @param string $code input buffer
    */
    public function appendCode($code) {
        if (strlen($code)) $code .= PHP_EOL;

$this->code .= $code;
    }

/**
    * check if readline support is enabled
    *
    * @return bool true if enabled, false otherwise
    */
    public function hasReadline() {
        return $this->have_readline;
    }

/**
    * get version of the class
    *
    * @return string version-string
    */
    public function getVersion() {
        return $this->version;
    }
}

/**
* a readline completion callback
*
* @param string $str linebuffer
* @param integer $pos position in linebuffer
* @return array list of possible matches
*/
function __shell_readline_complete($str, $pos) {
    $in = readline_info('line_buffer');

/**
    * parse the line-buffer backwards to see if we have a
    * - constant
    * - function
    * - variable
    */

$m = array();

if (preg_match('#\$([A-Za-z0-9_]+)->#', $in, $a)) {
        /* check for $o->... */
        $name = $a[1];

if (isset($GLOBALS[$name]) && is_object($GLOBALS[$name])) {
            $c = get_class_methods($GLOBALS[$name]);

foreach ($c as $v) {
                $m[] = $v.'(';
            }
            $c = get_class_vars(get_class($GLOBALS[$name]));

foreach ($c as $k => $v) {
                $m[] = $k;
            }

return $m;
        }
    } else if (preg_match('#\$([A-Za-z0-9_]+)\[([^\]]+)\]->#', $in, $a)) {
        /* check for $o[...]->... */
        $name = $a[1];

if (isset($GLOBALS[$name]) &&
            is_array($GLOBALS[$name]) &&
            isset($GLOBALS[$name][$a[2]])) {

$c = get_class_methods($GLOBALS[$name][$a[2]]);

foreach ($c as $v) {
                $m[] = $v.'(';
            }
            $c = get_class_vars(get_class($GLOBALS[$name][$a[2]]));

foreach ($c as $k => $v) {
                $m[] = $k;
            }
            return $m;
        }

} else if (preg_match('#([A-Za-z0-9_]+)::#', $in, $a)) {
        /* check for Class:: */
        $name = $a[1];

if (class_exists($name, false)) {
            $c = get_class_methods($name);

foreach ($c as $v) {
                $m[] = sprintf('%s::%s(', $name, $v);
            }

$cl = new ReflectionClass($name);
            $c = $cl->getConstants();

foreach ($c as $k => $v) {
                $m[] = sprintf('%s::%s', $name, $k);
            }

return $m;
        }
    } else if (preg_match('#\$([a-zA-Z]?[a-zA-Z0-9_]*)$#', $in)) {
        $m = array_keys($GLOBALS);

return $m;
    } else if (preg_match('#new #', $in)) {
        $c = get_declared_classes();

foreach ($c as $v) {
            $m[] = $v.'(';
        }

return $m;
    } else if (preg_match('#^:set #', $in)) {
        foreach (PHP_Shell_Options::getInstance()->getOptions() as $v) {
            $m[] = $v;
        }

return $m;
    }

$f = get_defined_functions();

foreach ($f['internal'] as $v) {
        $m[] = $v.'(';
    }

foreach ($f['user'] as $v) {
        $m[] = $v.'(';
    }

$c = get_declared_classes();

foreach ($c as $v) {
        $m[] = $v.'::';
    }

$c = get_defined_constants();

foreach ($c as $k => $v) {
        $m[] = $k;
    }

/* taken from http://de3.php.net/manual/en/reserved.php */
    $m[] = 'abstract';
    $m[] = 'and';
    $m[] = 'array(';
    $m[] = 'as';
    $m[] = 'break';
    $m[] = 'case';
    $m[] = 'catch';
    $m[] = 'class';
    $m[] = 'const';
    $m[] = 'continue';
    # $m[] = 'declare';
    $m[] = 'default';
    $m[] = 'die(';
    $m[] = 'do';
    $m[] = 'echo(';
    $m[] = 'else';
    $m[] = 'elseif';
    $m[] = 'empty(';
    # $m[] = 'enddeclare';
    $m[] = 'eval(';
    $m[] = 'exception';
    $m[] = 'extends';
    $m[] = 'exit(';
    $m[] = 'extends';
    $m[] = 'final';
    $m[] = 'for (';
    $m[] = 'foreach (';
    $m[] = 'function';
    $m[] = 'global';
    $m[] = 'if';
    $m[] = 'implements';
    $m[] = 'include "';
    $m[] = 'include_once "';
    $m[] = 'interface';
    $m[] = 'isset(';
    $m[] = 'list(';
    $m[] = 'new';
    $m[] = 'or';
    $m[] = 'print(';
    $m[] = 'private';
    $m[] = 'protected';
    $m[] = 'public';
    $m[] = 'require "';
    $m[] = 'require_once "';
    $m[] = 'return';
    $m[] = 'static';
    $m[] = 'switch (';
    $m[] = 'throw';
    $m[] = 'try';
    $m[] = 'unset(';
    # $m[] = 'use';
    $m[] = 'var';
    $m[] = 'while';
    $m[] = 'xor';
    $m[] = '__FILE__';
    $m[] = '__FUNCTION__';
    $m[] = '__CLASS__';
    $m[] = '__LINE__';
    $m[] = '__METHOD__';

# printf("%s ... %s\n", $str, $pos);
    return $m;
}

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