public function visitGrammar(GrammarNode $node)
{
$result = '';
if ($node->getNamespace() !== null) {
$result .= "namespace {$node->getNamespace()};\n\n";
}
if (count($node->getImports()) > 0) {
foreach ($node->getImports() as $import) {
$result .= "use {$import};\n";
}
$result .= "\n";
}
if ($node->getBase() === null) {
$result .= <<<EOS
class {$node->getName()}
{
protected \$string;
protected \$position;
protected \$value;
protected \$cache;
protected \$cut;
protected \$errors;
protected \$warnings;
EOS;
} else {
$result .= <<<EOS
class {$node->getName()} extends {$node->getBase()}
{
EOS;
}
$pieces = $this->getResults($node->getLength());
foreach ($pieces as $piece) {
$result .= <<<EOS
{$this->indent($piece)}
EOS;
}
if ($node->getStartSymbol() !== null) {
$result .= <<<EOS
private function line()
{
if (!empty(\$this->errors)) {
\$positions = array_keys(\$this->errors);
} else {
\$positions = array_keys(\$this->warnings);
}
return count(explode("\\n", substr(\$this->string, 0, max(\$positions))));
}
private function rest()
{
return '"' . substr(\$this->string, \$this->position) . '"';
}
protected function report(\$position, \$expecting)
{
if (\$this->cut) {
\$this->errors[\$position][] = \$expecting;
} else {
\$this->warnings[\$position][] = \$expecting;
}
}
private function expecting()
{
if (!empty(\$this->errors)) {
ksort(\$this->errors);
return end(\$this->errors)[0];
}
ksort(\$this->warnings);
return implode(', ', end(\$this->warnings));
}
public function parse(\$_string)
{
\$this->string = \$_string;
\$this->position = 0;
\$this->value = null;
\$this->cache = array();
\$this->cut = false;
\$this->errors = array();
\$this->warnings = array();
\$_success = \$this->parse{$node->getStartSymbol()}();
if (\$_success && \$this->position < strlen(\$this->string)) {
\$_success = false;
\$this->report(\$this->position, "end of file");
}
if (!\$_success) {
throw new \\InvalidArgumentException("Syntax error, expecting {\$this->expecting()} on line {\$this->line()}");
}
return \$this->value;
}
EOS;
}
$result .= <<<EOS
}
EOS;
$this->results[] = $result;
}
