public function rewriteExpression(ExpressionInterface $expression)
{
/** @var AlternativeExpression $expression */
$alternatives = $expression->getAlternatives();
$alternative = current($alternatives);
$key = key($alternatives);
$rewritten = $this->getRecursiveHandler()->rewriteExpression($alternative);
return new RewrittenExpressionContainer($rewritten->getExpression(), new AlternativeResultSimplifier($key, $rewritten->getResultRewriter()));
}
public function flattenExpression(ExpressionInterface $expression)
{
/** @var $expression AlternativeExpression */
$expressions = array($expression);
foreach ($expression->getAlternatives() as $alternative) {
$expressions = array_merge($expressions, $this->getRecursiveHandler()->flattenExpression($alternative));
}
return array_unique($expressions, SORT_REGULAR);
}
public function isPotentiallyEmpty(ExpressionInterface $expression)
{
/** @var $expression AlternativeExpression */
$potentially_empty = false;
foreach ($expression->getAlternatives() as $alternative) {
$alternative_is_potentially_empty = $this->getRecursiveHandler()->isPotentiallyEmpty($alternative) === true;
$potentially_empty = $potentially_empty || $alternative_is_potentially_empty;
}
return $potentially_empty;
}
public function rewriteExpression(ExpressionInterface $expression)
{
/** @var AlternativeExpression $expression */
$rewritten_alternatives = array_map(array($this->getRecursiveHandler(), "rewriteExpression"), $expression->getAlternatives());
$rewritten_alternative_expressions = array_map(function (RewrittenExpressionContainer $rewritten) {
return $rewritten->getExpression();
}, $rewritten_alternatives);
$rewritten_alternative_result_rewriters = array_map(function (RewrittenExpressionContainer $rewritten) {
return $rewritten->getResultRewriter();
}, $rewritten_alternatives);
return new RewrittenExpressionContainer(new AlternativeExpression($rewritten_alternative_expressions), new AlternativeExpressionResultRewriter($rewritten_alternative_result_rewriters));
}
public function compile(ExpressionInterface $expression)
{
/** @var $expression AlternativeExpression */
return new AlternativeParser(array_map(array($this->getRecursiveHandler(), "compile"), $expression->getAlternatives()));
}
