/**
* Implementation of “simple”.
*
* @return mixed
* @throws \Hoa\Compiler\Exception
* @throws \Hoa\Compiler\Exception\Rule
*/
protected function simple(&$pNodeId)
{
if ('capturing_' === $this->getCurrentToken()) {
$this->consumeToken();
$rule = $this->choice($pNodeId);
if (null === $rule) {
return null;
}
if ('_capturing' != $this->getCurrentToken()) {
return null;
}
$this->consumeToken();
return $rule;
}
if ('skipped' === $this->getCurrentToken()) {
$tokenName = trim($this->getCurrentToken('value'), ':');
if (']' === substr($tokenName, -1)) {
$uId = (int) substr($tokenName, strpos($tokenName, '[') + 1, -1);
$tokenName = substr($tokenName, 0, strpos($tokenName, '['));
} else {
$uId = -1;
}
$exists = false;
foreach ($this->_tokens as $namespace => $tokens) {
foreach ($tokens as $token => $value) {
if ($token === $tokenName || substr($token, 0, strpos($token, ':')) === $tokenName) {
$exists = true;
break 2;
}
}
}
if (false == $exists) {
throw new Compiler\Exception('Token ::%s:: does not exist in%s.', 3, [$tokenName, $this->_rule]);
}
$name = count($this->_createdRules) + 1;
$this->_createdRules[$name] = new Token($name, $tokenName, null, $uId);
$this->consumeToken();
return $name;
}
if ('kept' === $this->getCurrentToken()) {
$tokenName = trim($this->getCurrentToken('value'), '<>');
if (']' === substr($tokenName, -1)) {
$uId = (int) substr($tokenName, strpos($tokenName, '[') + 1, -1);
$tokenName = substr($tokenName, 0, strpos($tokenName, '['));
} else {
$uId = -1;
}
$exists = false;
foreach ($this->_tokens as $namespace => $tokens) {
foreach ($tokens as $token => $value) {
if ($token === $tokenName || substr($token, 0, strpos($token, ':')) === $tokenName) {
$exists = true;
break 2;
}
}
}
if (false == $exists) {
throw new Compiler\Exception('Token <%s> does not exist in%s.', 4, [$tokenName, $this->_rule]);
}
$name = count($this->_createdRules) + 1;
$token = new Token($name, $tokenName, null, $uId);
$token->setKept(true);
$this->_createdRules[$name] = $token;
$this->consumeToken();
return $name;
}
if ('named' === $this->getCurrentToken()) {
$tokenName = rtrim($this->getCurrentToken('value'), '()');
if (false === array_key_exists($tokenName, $this->_rules) && false === array_key_exists('#' . $tokenName, $this->_rules)) {
throw new Compiler\Exception\Rule('Rule %s() does not exist.', 5, $tokenName);
}
if (0 == $this->_currentState && 'EOF' === $this->getNextToken()) {
$name = count($this->_createdRules) + 1;
$this->_createdRules[$name] = new Concatenation($name, [$tokenName], null);
} else {
$name = $tokenName;
}
$this->consumeToken();
return $name;
}
return null;
}
/**
* Complete a token (namespace and representation).
* It returns the next namespace.
*
* @param \Hoa\Compiler\Llk\Rule\Token $token Token.
* @return string
*/
protected function completeToken(Compiler\Llk\Rule\Token $token)
{
if (null !== $token->getRepresentation()) {
return $this->_currentNamespace;
}
$name = $token->getTokenName();
$token->setNamespace($this->_currentNamespace);
$toNamespace = $this->_currentNamespace;
if (isset($this->_tokens[$this->_currentNamespace][$name])) {
$token->setRepresentation($this->_tokens[$this->_currentNamespace][$name]);
} else {
foreach ($this->_tokens[$this->_currentNamespace] as $_name => $regex) {
if (false === strpos($_name, ':')) {
continue;
}
list($_name, $toNamespace) = explode(':', $_name, 2);
if ($_name === $name) {
break;
}
}
$token->setRepresentation($regex);
}
return $toNamespace;
}
