public function testMerge()
{
$left = new TextNode('foo', new Context('bar'));
$right = new TextNode('baz', new Context('qux'));
$merged = TextNode::merge($left, $right);
$this->assertEquals(new TextNode('foobaz'), $merged);
}
private function visitText(Element $element)
{
$nodes = array();
// Walk childs and merge adjacent text nodes if needed
$last = null;
$last_index = -1;
foreach ($element->getChildren() as $child) {
$node = $child->accept($this);
// Merge text nodes together
if ($last instanceof AST\TextNode && $node instanceof AST\TextNode) {
// Prevent merge once a context is set
if ($last->hasContext()) {
throw new Exception('Unexpected text node after context');
}
$nodes[$last_index] = $last = AST\TextNode::merge($last, $node);
} else {
$nodes[] = $node;
$last = $node;
$last_index++;
}
}
// Once nodes are merged, we just "AND" them all together.
$root = null;
foreach ($nodes as $index => $node) {
if (!$root) {
$root = $node;
continue;
}
if ($node instanceof AST\Context) {
if ($root instanceof AST\ContextAbleInterface) {
$root = $root->withContext($node);
} else {
throw new Exception('Unexpected context after non-contextualizable node');
}
} elseif ($node instanceof AST\Node) {
$root = new AST\Boolean\AndExpression($root, $node);
} else {
throw new Exception('Unexpected node type inside text node.');
}
}
return $root;
}
