<?php
namespace eMacros;
class GenericList extends \ArrayObject implements Expression {
public function evaluate(Scope $scope) {
//empty list
if (!isset($this[0])) {
throw new \BadFunctionCallException("No operation found.");
}
//determine which function must be called
$function = $this[0]->evaluate($scope);
if (is_callable($function) && is_object($function)) {
$parameters = array();
foreach ($this->shift() as $arg) {
$parameters[] = $arg->evaluate($scope);
}
return call_user_func_array($function, $parameters);
}
if ($function instanceof Applicable) {
return $function->apply($scope, $this->shift());
}
throw new \UnexpectedValueException(sprintf("Unexpected %s '%s' at the beginning of the list.",
substr(strrchr(strtolower(get_class($this[0])), '\\'), 1),
$this[0]->__toString()));
}
public function shift() {
if (!isset($this[0])) {
return;
}
return new self(array_slice($this->getArrayCopy(), 1));
}
public function __toString() {
$sarr = array();
foreach ($this as $expr) {
$sarr[] = $expr instanceof Expression ? $expr->__toString() : '...';
}
return '(' . join(' ', $sarr) . ')';
}
}
?>
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