/**
* Creates constraint object from tokens.
* <p>
* If parameter $constraintName is not passed then current position should point to the name of the constraint.
*
* @param Tokenizer $tokenizer Tokens collection.
* @param string $constraintName Optional name of the constraint.
*
* @return Constraint
*/
public static function create(Tokenizer $tokenizer, $constraintName = '')
{
if ($constraintName === false) {
$constraintName = '';
} elseif (!$constraintName) {
$constraintName = $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
}
$constraint = new self($constraintName);
$token = $tokenizer->getCurrentToken();
$level = $token->level;
$constraintDefinition = '';
do {
if ($token->level == $level && $token->text == ',') {
break;
}
if ($token->level < $level && $token->text == ')') {
break;
}
$constraintDefinition .= $token->text;
$token = $tokenizer->nextToken();
} while (!$tokenizer->endOfInput());
$constraint->setBody($constraintDefinition);
return $constraint;
}
private function token()
{
try {
$lexer = new Tokenizer($this->source);
$token = $lexer->nextToken();
while ($token->key !== Tokenizer::EOF_TYPE) {
echo $token;
$token = $lexer->nextToken();
}
} catch (LexerError $e) {
echo $e->getMessage();
}
}
/**
* Creates stored procedure object from tokens.
* <p>
* Current position should point to the type of the stored procedure (PROCEDURE, FUNCTION or TYPE).
* <p>
* Name may consist of two parts divided by '.'.
*
* @param Tokenizer $tokenizer Tokens collection.
*
* @return Procedure
*/
public static function create(Tokenizer $tokenizer)
{
$type = $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
$tokenizer->skipWhiteSpace();
$name = $tokenizer->getCurrentToken()->text;
$token = $tokenizer->nextToken();
if ($token->text === '.') {
$token = $tokenizer->nextToken();
$name .= '.' . $token->text;
}
$procedure = new self($name, $type);
$tokenizer->resetState();
$definition = '';
while (!$tokenizer->endOfInput()) {
$definition .= $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
}
$procedure->setBody($definition);
return $procedure;
}
/**
* Creates sequence object from tokens.
* <p>
* Current position should point to the name of the sequence.
*
* @param Tokenizer $tokenizer Tokens collection.
*
* @return Sequence
*/
public static function create(Tokenizer $tokenizer)
{
$name = $tokenizer->getCurrentToken()->text;
$sequence = new self($name);
$tokenizer->resetState();
$definition = '';
while (!$tokenizer->endOfInput()) {
$definition .= $tokenizer->getCurrentToken()->text;
$tokenizer->nextToken();
}
$sequence->setBody($definition);
return $sequence;
}
<?php
/**
* @author Elynton Fellipe Bazzo
* @author Andrei Siqueira
*/
require_once 'Lexer.php';
require_once 'Tokenizer.php';
require_once 'Token.php';
require_once 'LexerError.php';
$source = <<<END
1 + 1 / 2.3;
2.3 * -(4) - 2;
END;
try {
// Instanciamos o lexer
$lexer = new Tokenizer($source);
// Começamos pedindo o primeiro token
$token = $lexer->nextToken();
// Enquanto houver tokens, vamos imprimindo
// Não criamos uma tabela de símbolos porque não faria sentido se ela não
// teria uma saída
while ($token->key !== Tokenizer::EOF_TYPE) {
echo $token;
$token = $lexer->nextToken();
}
} catch (LexerError $e) {
echo $e->getMessage();
}
