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scriptparser.class.php
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<?php
/**
* This class parses HadesScripts
*
* @license http://opensource.org/licenses/bsd-license
* @author Christian Neff <[email protected]>
* @author Miles Kaufmann <http://www.twmagic.com>
*/
class scriptparser {
public $silent = false;
public $throwErrors = true;
public $libsDir = 'scriptlibs';
public $variables = array();
public $functions = array();
public $namespace = null;
private $messages = array();
private $_line = 0;
private $_zone = null;
private $_level = 0;
private $_capture = false;
private $_cache = array();
public function __construct($libs = array('math', 'string', 'array')) {
foreach ($libs as $lib) {
$class = 'scriptlib_'.$lib;
$namespace = str_replace('_', ':', $lib);
include $this->libsDir.'/'.$class.'.class.php';
$this->importFunctions($class, $namespace);
}
}
public function __get($varName) {
if ($varName[0] != '_') {
return $this->$varName;
}
}
public function execute($code, $zone = null, $protected = false, $vars = array()) {
// protected mode active?
if ($protected) {
$varsBackup = array();
// walk through all registered variables
foreach ($this->variables as $varName => $varRecord) {
// if a variable is local, back it up and unset it
if ($this->variables[$varName]->scope == 0) {
$varsBackup[$varName] = $varRecord;
unset($this->variables[$varName]);
}
}
// if there are predefined variables given, add them to the variable registry
if (is_array($vars) && !empty($vars)) {
foreach ($vars as $varName => $varValue) {
$this->declareVariable($varName, $varValue);
}
}
}
$lines = explode("\n", $code);
$lineCount = count($lines);
$block = new scriptparser_blockStack($this->_level);
for ($lineNumber = 1; $lineNumber <= $lineCount; $lineNumber++) {
$this->_line = $lineNumber;
$this->_zone = $zone;
$line = trim($lines[$lineNumber-1]);
if ($line != '' && substr($line, 0, 1) != ';') {
if (!preg_match('/^([a-zA-Z_][\w:]*)(?:\s+(.+))*$/', $line, $matches))
return $this->_triggerMessage('Invalid command', 2);
$command = $matches[1]; $parameters = (isSet($matches[2]) ? $matches[2] : false);
switch ($command) {
case 'return':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
$return = $this->evaluateFormula($parameters);
break 2;
case 'echo':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
$message = $this->evaluateFormula($parameters);
if (!$this->silent) {
echo $message;
} else {
$this->_triggerMessage($message, 0);
}
break;
case 'eval':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
$code = (string) $this->evaluateFormula($parameters);
$this->execute($code);
break;
case 'import':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
$file = (string) $this->evaluateFormula($parameters);
$this->executeFile($file);
break;
case 'namespace':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
if ($parameters == 'global') {
$this->namespace = null;
} else {
$this->namespace = (string) $this->evaluateFormula($parameters);
}
break;
case 'var':
case 'global':
case 'const':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
// what type?
if ($command == 'var') {
$varType = 0;
} elseif ($command == 'global') {
$varType = 1;
} elseif ($command == 'const') {
$varType = 2;
}
// syntax okay?
if ($parameters) {
$vars = $this->_walkAssignList($parameters);
} else {
return _triggerMessage('Invalid syntax', 2);
}
// declare each variable
foreach ($vars as $varName => $varValue) {
// make sure that it is not declared yet
if (isSet($this->variables[$varName])) {
$this->_triggerMessage('Cannot redeclare variable $'.$varName);
continue;
}
// stick it in the variable array
$this->declareVariable($varName, !is_null($varValue) ? $varValue : false, $varType);
}
break;
case 'set':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!$block->get('active'))
continue;
if (!preg_match('/^\$([a-zA-Z_][\w\.]*)\s*(=|\+|-|\*|\/)\s*(.+)$/', $parameters, $matches))
return $this->_triggerMessage('Invalid syntax', 2);
$varPath = $matches[1]; $varOperation = $matches[2]; $varValue = $matches[3];
list($varName) = explode('.', $varPath);
// make sure we're not re-assigning a constant
if ($this->variables[$varName]->scope == 2) {
$this->_triggerMessage('Cannot set constant $'.$varName);
continue;
}
// operation type?
switch ($varOperation) {
case '=':
$varValueResult = $varValue;
break;
case '+':
$variable = $this->getVariable($varPath);
if (is_array($variable)) {
array_push($variable, $varValue);
$varValueResult = $variable;
} elseif (is_string($variable)) {
$varValueResult = $variable . $varValue;
} else {
$varValueResult = $variable + $varValue;
}
break;
case '-':
$variable = $this->getVariable($varPath);
if (is_string($variable)) {
$varValueResult = str_replace($varValue, '', $variable);
} else {
$varValueResult = $variable - $varValue;
}
break;
case '*':
$varValueResult = $this->getVariable($varPath) * $varValue;
break;
case '/':
$varValueResult = $this->getVariable($varPath) / $varValue;
break;
default:
$this->_triggerMessage('Invalid assignment operator \''.$varOperation.'\'');
break;
}
// stick it in the variable array
$this->setVariable($varPath, $varValueResult);
break;
case 'if':
$this->_level++;
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
$active = false;
if ($block->get('active', 1)) {
if ((bool) $this->evaluateFormula($parameters))
$active = true;
}
$block->update('if', $active);
break;
case 'elseif':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
$active = false;
if ($this->_capture) {
$this->_cache[] = $line;
continue;
}
if ($block->get('active', 1) && !$block->get('done')) {
if ((bool) $this->evaluateFormula($parameters)) {
$active = true;
}
}
$block->update('if', $active);
break;
case 'else':
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
$active = false;
if ($block->get('active', 1) && !$block->get('done')) {
$active = true;
}
$block->update('if', $active);
break;
case 'while':
$this->_level++;
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
$active = false; $loopBegin = false;
if ($block->get('active', 1) && ($block->isRegistered() ? $block->get('active') : true)) {
if ((bool) $this->evaluateFormula($parameters)) {
$active = true;
$loopBegin = $lineNumber;
}
}
$block->update('while', $active, array('loopBegin' => $loopBegin));
break;
case 'for':
$this->_level++;
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!preg_match('/^\$([a-zA-Z_]\w*)\s*=\s*(.+)\s+to\s+(.+)$/', $parameters, $matches))
return $this->_triggerMessage('Invalid syntax in for block', 2);
$varName = $matches[1];
$varStart = $this->evaluateFormula($matches[2]);
if (preg_match('/^(.+)\s+step\s+(.+)$/', $matches[3], $submatches)) {
$varEnd = (int) $this->evaluateFormula($submatches[1]);
$varStep = (int) $this->evaluateFormula($submatches[2]);
} else {
$varEnd = (int) $this->evaluateFormula($matches[3]);
$varStep = 1;
}
if ($block->get('active', 1) && !$block->isRegistered()) {
$block->update('for', true, array('loopBegin' => $lineNumber));
$this->declareVariable($varName, $varStart);
} elseif ($block->get('active', 1) && $this->variables[$varName]->value != $varEnd) {
if ($varEnd > $varStart) {
$this->variables[$varName]->value += $varStep;
} elseif ($varEnd < $varStart) {
$this->variables[$varName]->value -= $varStep;
}
} else {
$block->update('for', false);
}
break;
case 'foreach':
$this->_level++;
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
if (!preg_match('/^\$([a-zA-Z_]\w*)\s+in\s+(.+)$/', $parameters, $matches))
return $this->_triggerMessage('Invalid variable name for foreach block', 2);
$varName = $matches[1];
$inputArray = $this->evaluateFormula($matches[2]);
if (!is_array($inputArray))
return $this->_triggerMessage("Invalid argument supplied for foreach block", 2);
$active = false; $loopBegin = false; $activeNow = true; $iterationNow = 0;
if ($block->isRegistered()) {
$activeNow = $block->get('active');
$iterationNow = $block->get('iteration');
} else {
$this->declareVariable($varName, array());
}
if ($block->get('active', 1) && $activeNow) {
$last = count($inputArray)-1;
$keys = array_keys($inputArray);
$values = array_values($inputArray);
$offset = $iterationNow;
if ($offset <= $last) {
$active = true;
$loopBegin = $lineNumber;
$this->variables[$varName]->value['key'] = $keys[$offset];
$this->variables[$varName]->value['value'] = $values[$offset];
}
}
$block->update('foreach', $active, array('loopBegin' => $loopBegin));
break;
case 'macro':
$this->_level++;
if ($block->get('type') == 'macro') {
$this->_cache[] = $line;
continue;
}
// fetch name and raw arguments
if (preg_match('/^([a-zA-Z_]\w*)\s+(.+)$/', $parameters, $matches)) {
$funcName = $matches[1];
$funcArgsList = $matches[2];
} elseif (preg_match('/^[a-zA-Z_]\w*$/', $parameters)) {
$funcName = $parameters;
$funcArgsList = false;
} else {
return $this->_triggerMessage('Invalid syntax in function definition', 2);
}
// make sure it isn't defined yet
if (isSet($this->functions[$funcName]))
return $this->_triggerMessage('Cannot redefine function {'.$funcName.'}', 2);
// get the arguments
$funcArgs = array(); $funcArgDefaults = array();
if ($funcArgsList) {
foreach ($this->_walkAssignList($funcArgsList) as $key => $value) {
$funcArgs[] = $key;
if (!is_null($value))
$funcArgDefaults[$key] = $value;
}
}
// register block
$options = array(
'name' => $funcName,
'args' => $funcArgs,
'argDefaults' => $funcArgDefaults
);
$block->update('macro', true, $options);
break;
case 'end':
if ($block->get('loop') && $block->get('active')) {
$lineNumber = $block->get('loopBegin')-1;
} else {
if ($block->get('type') == 'macro') {
$sequence = implode("\n", $this->_cache); $this->_cache = array();
$this->createFunction($this->namespace, $block->get('name'), $sequence, $block->get('args'), $block->get('argDefaults'));
}
$block->remove();
}
$this->_level--;
break;
default:
if (!$block->get('active'))
continue;
// get function name and check if the function exists
if (!isSet($this->functions[$command]))
return $this->_triggerMessage('Call to undefined function {'.$command.'}', 2);
// build arguments array
if ($parameters) {
$funcArgs = $this->_walkValueList($parameters);
} else {
$funcArgs = array();
}
// cast the function
$this->castFunction($command, $funcArgs);
break;
}
}
}
// is the level higher than 0? if yes, there is a missing block end
if ($this->_level > 0)
return $this->_triggerMessage('Missing block end', 2);
// protected mode active?
if ($protected) {
// remove all temporarily added local variables
foreach ($this->variables as $varName => $varRecord) {
if ($this->variables[$varName]->scope == 0) {
unset($this->variables[$varName]);
}
}
// restore all previously backed up variables to the variable registry
$this->variables = array_merge($this->variables, $varsBackup);
}
return (isSet($return) ? $return : true);
}
public function executeFile($file) {
if (($code = file_get_contents($file)) === false)
return trigger_error('scriptparser: Could not open script file \''.$file.'\'', E_USER_ERROR);
return $this->execute($code, realpath($file));
}
public function evaluateFormula($formula) {
$tokens = $this->_tokenizeFormula($formula);
if ($tokens === false)
return false;
return $this->_computeFormula($tokens);
}
public function getVariable($path) {
$pathParts = explode('.', $path);
$name = $pathParts[0];
$key = array_slice($pathParts, 1);
// generate skeleton
$varSkeleton = "\$this->variables['{$name}']->value";
if (!empty($key)) {
foreach ($key as $keyPart) {
if (preg_match('/^\d+$/', $keyPart)) {
$varSkeleton .= '['.$keyPart.']';
} elseif (preg_match('/^[a-zA-Z_]\w*$/', $keyPart)) {
$varSkeleton .= '[\''.$keyPart.'\']';
} else {
trigger_error('scriptparser: Invalid key name for variable', E_USER_WARNING);
return null;
}
}
}
// get the variable
return eval("return (isSet(\$this->variables['{$name}']) ? {$varSkeleton} : false);");
}
public function declareVariable($name, $value, $scope = 0) {
if (strpos($name, '.') !== false) {
trigger_error('scriptparser: Declaring a variable\'s subvalue is illegal', E_USER_WARNING);
return false;
}
$this->variables[$name] = new scriptparser_variable($value, $scope);
return true;
}
public function setVariable($path, $value) {
$pathParts = explode('.', $path);
$name = $pathParts[0];
// is it not yet declared? then declare it as local variable
if (!isSet($this->variables[$name]))
$this->declareVariable($name, $value, 0);
// get the key
$key = array_slice($pathParts, 1);
// generate skeleton
$varSkeleton = "\$this->variables['{$name}']->value";
if (!empty($key)) {
foreach ($key as $keyPart) {
if (preg_match('/^\d+$/', $keyPart)) {
$varSkeleton .= "[{$keyPart}]";
} elseif (preg_match('/^[a-zA-Z_]\w*$/', $keyPart)) {
$varSkeleton .= "['{$keyPart}']";
} else {
trigger_error('scriptparser: Invalid key name for variable', E_USER_WARNING);
return null;
}
}
}
// get the variable
eval("\$varRef =& {$varSkeleton};");
$varRef = $value;
return true;
}
public function castFunction($name, array $arguments) {
// is function defined?
if (isSet($this->functions[$name])) {
$func = $this->functions[$name];
} else {
trigger_error('scriptparser: Call to undefined function {'.$name.'}', E_USER_WARNING);
return false;
}
// make a list of predefined variables (arguments)
$predefinedVars = array();
foreach ($func->arguments as $argIndex => $argName) {
if (isSet($arguments[$argIndex])) {
$predefinedVars[$argName] = $arguments[$argIndex];
} elseif (isSet($func->argDefaults[$argName])) {
$predefinedVars[$argName] = $func->argDefaults[$argName];
} else {
$this->_triggerMessage('No default value for argument $'.$argName.' of {'.$name.'}');
$predefinedVars[$argName] = false;
}
}
// what type?
if ($func->type == 'callback') {
// is it a PHP callback...
return call_user_func_array($func->sequence, $predefinedVars);
} elseif ($func->type = 'code') {
// ... or some HadesScript code?
return $this->execute($func->sequence, '{'.$name.'}', true, $predefinedVars);
} else {
// something else
return false;
}
}
public function createFunction($namespace = null, $name, $sequence, array $arguments, array $argDefaults = array()) {
$func = new scriptparser_function($name, $sequence, $arguments, $argDefaults);
if (is_string($namespace))
$name = $namespace . ':' . $name;
$this->functions[$name] = $func;
return true;
}
public function importFunctions($class, $namespace = null) {
if (!class_exists($class)) {
trigger_error('scriptparser: Class \''.$class.'\' does not exist', E_USER_WARNING);
return false;
}
$reflectClass = new ReflectionClass($class);
foreach ($reflectClass->getMethods() as $reflectMethod) {
$funcName = $reflectMethod->name;
$funcArgs = array(); $funcArgDefaults = array();
if ($reflectMethod->getNumberOfParameters() > 0) {
foreach ($reflectMethod->getParameters() as $reflectParameter) {
$funcArgs[] = $reflectParameter->name;
if ($reflectParameter->isOptional()) {
$funcArgDefaults[$reflectParameter->name] = $reflectParameter->getDefaultValue();
}
}
}
$this->createFunction($namespace, $funcName, array($class, $funcName), $funcArgs, $funcArgDefaults);
}
return true;
}
private function _tokenizeFormula($expression) {
$index = 0;
$stack = new scriptparser_mathStack;
$output = array();
$depth = array('std' => 0, 'sts' => 0, 'arr' => 0, 'fnc' => 0);
$escape = false;
$buffer = '';
$expectingOperator = false; // we use this for syntax-checking and determining if a '-' is a negation
// all allowed operators
$operators = array('+', '-', '*', '/', '%', '^', '_');
$operatorsRightAssoc = array('+' => 0, '-' => 0, '*' => 0, '/' => 0, '%' => 0, '_' => 0, '^' => 1);
$operatorsPrecedence = array('+' => 0, '-' => 0, '*' => 1, '/' => 1, '%' => 1, '_' => 1, '^' => 2);
$expression = trim($expression);
while (true) {
// get the first character at the current index
$char = $expression[$index];
// find out if we're currently at the beginning of a number/variable/parenthesis/operand
$atBeginning = preg_match('/^([a-zA-Z_]+|\$[a-zA-Z_][\w\.]*|\d+(?:\.\d*)?|\.\d+|\()/', substr($expression, $index), $match);
if ($char == "'" && $depth['arr'] == 0 && $depth['fnc'] == 0 && $depth['std'] == 0) {
$buffer .= $char;
$index++;
if ($depth['sts'] == 0) {
$depth['sts']++;
$expectingOperator = false;
} elseif (!$escape) {
$depth['sts']--;
$output[] = $buffer;
$buffer = '';
$expectingOperator = true;
}
} elseif ($char == '"' && $depth['arr'] == 0 && $depth['fnc'] == 0 && $depth['sts'] == 0) {
$buffer .= $char;
$index++;
if ($depth['std'] == 0) {
$depth['std']++;
$expectingOperator = false;
} elseif (!$escape) {
$depth['std']--;
$output[] = $buffer;
$buffer = '';
$expectingOperator = true;
}
} elseif ($char == '[' && $depth['fnc'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$buffer .= $char;
$index++;
$depth['arr']++;
$expectingOperator = false;
} elseif ($char == ']' && $depth['fnc'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$buffer .= $char;
$index++;
if ($depth['arr'] >= 1) {
$depth['arr']--;
if ($depth['arr'] == 0) {
$output[] = $buffer;
$buffer = '';
$expectingOperator = true;
}
} else {
return $this->_triggerMessage('Unexpected closing array delimiter', 2);
}
} elseif ($char == '{' && $depth['arr'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$buffer .= $char;
$index++;
$depth['fnc']++;
$expectingOperator = false;
} elseif ($char == '}' && $depth['arr'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$buffer .= $char;
$index++;
if ($depth['fnc'] >= 1) {
$depth['fnc']--;
if ($depth['fnc'] == 0) {
$output[] = $buffer;
$buffer = '';
$expectingOperator = true;
}
} else {
return $this->_triggerMessage('Unexpected closing function call delimiter', 2);
}
} elseif (!$escape && $char == '\\' && ($depth['sts'] == 1 || $depth['std'] == 1)) {
$buffer .= '\\';
$escape = true;
$index++;
} elseif ($depth['sts'] == 1 || $depth['std'] == 1 || $depth['arr'] >= 1 || $depth['fnc'] >= 1) {
$escape = false;
$buffer .= $char;
$index++;
} elseif ($char == '-' && !$expectingOperator) {
// is it a negation instead of a minus? put a negation on the stack
$stack->push('_');
$index++;
} elseif ($char == '_') {
// we have to explicitly deny this, because it's legal on the stack and therefore not in the
// input expression
return $this->_triggerMessage('Unexpected character \'_\'', 2);
} elseif ((in_array($char, $operators) || in_array($char, array('&', '|', '~', '=', '!', '<', '>')) || $atBeginning) && $expectingOperator) {
// are we putting an operator on the stack?
if ($atBeginning) {
// are we expecting an operator but have a number/variable/function/opening parenthesis?
// then it's an implicit multiplication
$char = '*';
$index--;
}
// the heart of the algorithm
// many thanks: http://en.wikipedia.org/wiki/Reverse_Polish_notation#The_algorithm_in_detail
while ($stack->count > 0 && ($operator2 = $stack->last()) && in_array($operator2, $operators) && ($operatorsRightAssoc[$char] ? $operatorsPrecedence[$char] < $operatorsPrecedence[$operator2] : $operatorsPrecedence[$char] <= $operatorsPrecedence[$operator2])) {
// pop stuff off the stack into the output
$output[] = $stack->pop();
}
// logical and comparison operators
if ($char == '&' || $char == '|' || $char == '~') {
$output[] = $stack->pop();
$stack->push($char);
$index++;
} elseif ($char == '=' || $char == '!') {
if ($expression[$index + 1] == '=' && $expression[$index + 2] == '=') {
$stack->push($char . '==');
$index += 3;
} elseif ($expression[$index + 1] == '=') {
$stack->push($char . '=');
$index += 2;
} else {
return $this->_triggerMessage('Unexpected character \''.$char.'\'', 2);
}
} elseif ($char == '<' || $char == '>') {
if ($expression[$index + 1] == '=') {
$stack->push($char . '=');
$index += 2;
} else {
$stack->push($char);
$index++;
}
} else {
$stack->push($char);
$index++;
}
// finally put our operator onto the stack
$expectingOperator = false;
} elseif ($char == ')' && $expectingOperator) {
// ready to close a parenthesis?
while (($operator2 = $stack->pop()) != '(') {
// pop off the stack back to the last (
if (is_null($operator2)) {
return $this->_triggerMessage('Unexpected closing parenthesis', 2);
} else {
$output[] = $operator2;
}
}
$index++;
} elseif ($char == '(' && !$expectingOperator) {
// that was easy
$stack->push('(');
$index++;
$allowNegation = true;
} elseif ($atBeginning && !$expectingOperator) {
// do we now have a variable/value?
$expectingOperator = true;
$val = $match[1];
$output[] = $val;
$index += strlen($val);
} elseif ($char == ')') {
// miscellaneous error checking
return $this->_triggerMessage('Unexpected closing parenthesis', 2);
} elseif (in_array($char, $operators) && !$expectingOperator) {
// unexpected operator
return $this->_triggerMessage('Unexpected operator \''.$char.'\'', 2);
} else {
// unknown character
return $this->_triggerMessage('Unexpected character \''.$char.'\'', 2);
}
if ($index == strlen($expression)) {
if (in_array($char, $operators)) {
return $this->_triggerMessage('Invalid or missing operand', 2);
} else {
break;
}
}
while ($depth['sts'] == 0 && $depth['std'] == 0 && $depth['arr'] == 0 && $depth['fnc'] == 0 && substr($expression, $index, 1) == ' ') {
// step the index past whitespace (pretty much turns whitespace into implicit multiplication
// if no operator is there)
$index++;
}
}
// is everything okay?
if ($depth['sts'] >= 1 || $depth['std'] >= 1)
return $this->_triggerMessage('Missing closing string delimiter', 2);
if ($depth['arr'] >= 1)
return $this->_triggerMessage('Missing closing array delimiter', 2);
if ($depth['fnc'] >= 1)
return $this->_triggerMessage('Missing closing function call delimiter', 2);
// pop everything off the stack and push onto output if there are (s on the stack, ()s were unbalanced
while (!is_null($char = $stack->pop())) {
if ($char == '(')
return $this->_triggerMessage('Missing closing parenthesis', 2);
$output[] = $char;
}
return $output;
}
private function _computeFormula(array $tokens, array $vars = array()) {
if ($tokens == false)
return false;
$operators = array('+', '-', '*', '/', '%', '^', '&', '|', '~', '==', '===', '!=', '!==', '<', '<=', '>', '>=');
$stack = new scriptparser_mathStack;
foreach ($tokens as $token) {
if (in_array($token, $operators)) {
// if the token is a binary operator, pop two values off the stack, do the operation, and push
// the result back on
if (is_null($operand2 = $stack->pop()))
return $this->_triggerMessage('Invalid second operand', 2);
if (is_null($operand1 = $stack->pop()))
return $this->_triggerMessage('Invalid first operand', 2);
switch ($token) {
case '+':
if (is_array($operand1) && is_array($operand2)) {
$stack->push(array_merge($operand1, $operand2));
} elseif (is_string($operand1)) {
$stack->push($operand1 . $operand2);
} else {
$stack->push($operand1 + $operand2);
}
break;
case '-':
if (is_array($operand1) && is_array($operand2)) {
$stack->push(array_diff($operand1, $operand2));
} else {
$stack->push($operand1 - $operand2);
}
break;
case '*':
$stack->push($operand1 * $operand2);
break;
case '/':
if ($operand2 == 0)
return $this->_triggerMessage('Division by zero');
$stack->push($operand1 / $operand2);
break;
case '%':
$stack->push($operand1 % $operand2);
break;
case '^':
$stack->push(pow($operand1, $operand2));
break;
case '&':
$stack->push($operand1 && $operand2);
break;
case '|':
$stack->push($operand1 || $operand2);
break;
case '~':
$stack->push($operand1 xor $operand2);
break;
case '==':
$stack->push($operand1 == $operand2);
break;
case '!=':
$stack->push($operand1 != $operand2);
break;
case '===':
$stack->push($operand1 === $operand2);
break;
case '!==':
$stack->push($operand1 !== $operand2);
break;
case '<':
$stack->push($operand1 < $operand2);
break;
case '<=':
$stack->push($operand1 <= $operand2);
break;
case '>':
$stack->push($operand1 > $operand2);
break;
case '>=':
$stack->push($operand1 >= $operand2);
break;
}
} elseif ($token == '_') {
// if the token is a unary operator, pop one value off the stack, do the operation, and push
// it back on
$stack->push(-1 * $stack->pop());
} elseif (preg_match('/^(true|false)$/i', $token) || is_numeric($token)) {
// it's a boolean value or a numeric value
eval('$stack->push('.$token.');');
} elseif ($this->_isEnclosure("'", $token, $result)) {
// it's a simple string
eval('$stack->push(\''.$result.'\');');
} elseif ($this->_isEnclosure('"', $token, $result)) {
// it's a double-quoted string
$string = str_replace('$', '\$', $result);
eval('$stack->push("'.$string.'");');
} elseif ($this->_isEnclosure(array('[', ']'), $token, $result)) {
// it's an array
if ($result == '') {
// the array is empty
$stack->push(array());
continue;
}
// get the values and push the result onto the stack
$pushVal = $this->_walkValueList($result, true);
$stack->push($pushVal);
} elseif ($this->_isEnclosure(array('{', '}'), $token, $result)) {
// it's a function call
if (preg_match('/^([a-zA-Z_][\w:]*)\s+(.+)$/', $result, $matches)) {
$funcName = $matches[1];
$funcArgsList = $matches[2];
} elseif (preg_match('/^[a-zA-Z_][\w:]*$/', $result)) {
$funcName = $result;
$funcArgsList = false;
} else {
return $this->_triggerMessage('Invalid syntax in function call', 2);
}
// check if the function already exists
if (!isSet($this->functions[$funcName]))
return $this->_triggerMessage('Call to undefined function {'.$funcName.'}', 2);
// build arguments array
if ($funcArgsList) {
$funcArgs = $this->_walkValueList($funcArgsList);
} else {
$funcArgs = array();
}
// cast the function and push the result onto the stack
$pushVal = $this->castFunction($funcName, $funcArgs);
$stack->push($pushVal);
} elseif (preg_match('/^\$([a-zA-Z_][\w\.]*)$/', $token, $matches)) {
// it's a value represented by a variable
$stack->push($this->getVariable($matches[1]));
} else {
// not a valid value
return $this->_triggerMessage('Invalid value \''.$token.'\'');
}
}
// when we're out of tokens, the stack should have a single element, the final result
if ($stack->count != 1)
trigger_error('scriptparser: Unexpected internal error', E_USER_ERROR);
return $stack->pop();
}
private function _isEnclosure($char, $input, &$result = null) {
if (is_array($char)) {
$charBefore = $char[0];
$charBeforeLen = strlen($charBefore);
$charAfter = $char[1];
$charAfterLen = strlen($charAfter);
if (substr($input, 0, $charBeforeLen) == $charBefore && substr($input, 0 - $charAfterLen, $charAfterLen) == $charAfter) {
$result = substr($input, $charBeforeLen, 0 - $charAfterLen);
return true;
}
} else {
$charLen = strlen($char);
if (substr($input, 0, $charLen) == $char && substr($input, 0 - $charLen, $charLen) == $char) {
$result = substr($input, $charLen, 0 - $charLen);
return true;
}
}
$result = null;
return false;
}
private function _walkValueList($input, $keying = false) {
$return = array(); $buffer = '';
$depth = array('std' => 0, 'sts' => 0, 'arr' => 0, 'fnc' => 0); $escape = false;
$end = strlen($input); $chars = str_split($input);
for ($pos = 0; $pos <= $end; $pos++) {
$char = $chars[$pos];
if ($char == "'" && $depth['arr'] == 0 && $depth['fnc'] == 0 && $depth['std'] == 0) {
if ($depth['sts'] == 0) {
$depth['sts']++;
} elseif (!$escape) {
$depth['sts']--;
}
} elseif ($char == '"' && $depth['arr'] == 0 && $depth['fnc'] == 0 && $depth['sts'] == 0) {
if ($depth['std'] == 0) {
$depth['std']++;
} elseif (!$escape) {
$depth['std']--;
}
} elseif ($char == '[' && $depth['fnc'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['arr']++;
} elseif ($char == ']' && $depth['fnc'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['arr']--;
} elseif ($char == '{' && $depth['arr'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['fnc']++;
} elseif ($char == '}' && $depth['arr'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['fnc']--;
} elseif (!$escape && $char == '\\' && ($depth['sts'] == 1 || $depth['std'] == 1)) {
$escape = true;
} else {
$escape = false;
}
$onTop = $depth['sts'] == 0 && $depth['std'] == 0 && $depth['arr'] == 0 && $depth['fnc'] == 0;
if (($char == ',' && $onTop) || $pos == $end) {
if ($keying && preg_match('/^([a-zA-Z_]\w*)\s*:\s*(.+)$/', $buffer, $matches)) {
$output[$matches[1]] = $this->evaluateFormula($matches[2]);
} else {
$return[] = $this->evaluateFormula($buffer);
}
$buffer = '';
} elseif ($char == ' ' && $onTop) {
continue;
} else {
$buffer .= $char;
}
}
return $return;
}
private function _walkAssignList($input) {
$return = array(); $buffer = '';
$depth = array('std' => 0, 'sts' => 0, 'arr' => 0, 'fnc' => 0); $escape = false;
$end = strlen($input); $chars = str_split($input);
for ($pos = 0; $pos <= $end; $pos++) {
$char = $chars[$pos];
if ($char == "'" && $depth['arr'] == 0 && $depth['fnc'] == 0 && $depth['std'] == 0) {
if ($depth['sts'] == 0) {
$depth['sts']++;
} elseif (!$escape) {
$depth['sts']--;
}
} elseif ($char == '"' && $depth['arr'] == 0 && $depth['fnc'] == 0 && $depth['sts'] == 0) {
if ($depth['std'] == 0) {
$depth['std']++;
} elseif (!$escape) {
$depth['std']--;
}
} elseif ($char == '[' && $depth['fnc'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['arr']++;
} elseif ($char == ']' && $depth['fnc'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['arr']--;
} elseif ($char == '{' && $depth['arr'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['fnc']++;
} elseif ($char == '}' && $depth['arr'] == 0 && $depth['sts'] == 0 && $depth['std'] == 0) {
$depth['fnc']--;
} elseif (!$escape && $char == '\\' && ($depth['sts'] == 1 || $depth['std'] == 1)) {
$escape = true;
} else {