protected function walkFor(ForNode $for)
{
$variableNames = array();
foreach ($for->getBody() as $statement) {
foreach ($this->walk($statement) as $name => $_) {
$variableNames[$name] = true;
}
}
if ($for->getElseBody() !== null) {
foreach ($for->getElseBody() as $statement) {
foreach ($this->walk($statement) as $name => $_) {
$variableNames[$name] = true;
}
}
}
return $variableNames;
}
protected function walkFor(ForNode $for)
{
$ret = "for (\${$for->getVariableName()} = ";
$ret .= $this->walk($for->getFrom()) . ", ";
$toSym = $this->gensym();
$ret .= "{$toSym} = " . $this->walk($for->getTo()) . ", ";
$iterationsSym = $this->gensym();
$ret .= "{$iterationsSym} = 0; ";
$ret .= "\${$for->getVariableName()} <= {$toSym}; ";
$ret .= "\${$for->getVariableName()} += " . ($for->getStep() === null ? "1" : $this->walk($for->getStep()));
$ret .= ", ++{$iterationsSym}) {" . implode("", $this->walkEach((array) $for->getBody())) . "}";
$ret .= "if ({$iterationsSym} < 1) {" . implode("", $this->walkEach((array) $for->getElseBody())) . "}";
return $ret;
}
protected function walkFor(ForNode $for)
{
return new ForNode($for->getVariableName(), $for->getFrom(), $for->getTo(), $for->getStep(), $this->walkEach($for->getBody()), $this->walkEach($for->getElseBody()));
}
protected function walkFor(ForNode $for)
{
$this->walkEachDisallow($for->getBody(), "for");
$this->walkEachDisallow($for->getElseBody(), "forelse");
}