/**
* Extracts the name of affected column.
*
* @param Parser $parser The instance that requests parsing.
* @param TokensList $list The list of tokens to be parsed.
* @param Token $token The token that is being parsed.
*
* @return void
*/
public function after(Parser $parser, TokensList $list, Token $token)
{
// Parsing operation.
++$list->idx;
$this->options->merge(OptionsFragment::parse($parser, $list, static::$OPTIONS));
// Parsing affected field.
++$list->idx;
$this->altered = FieldFragment::parse($parser, $list);
//
parent::after($parser, $list, $token);
}
/**
* Parses the additional options fragment at the end.
*
* @param Parser $parser The instance that requests parsing.
* @param TokensList $list The list of tokens to be parsed.
* @param Token $token The token that is being parsed.
*
* @return void
*/
public function after(Parser $parser, TokensList $list, Token $token)
{
// [some options] is going to be parsed first.
//
// There is a parser specified in `Parser::$KEYWORD_PARSERS`
// which parses the name of the tables.
//
// Finally, we parse here [some more options] and that's all.
++$list->idx;
$this->options->merge(OptionsFragment::parse($parser, $list, static::$OPTIONS));
}
/**
* @param Parser $parser The parser that serves as context.
* @param TokensList $list The list of tokens that are being parsed.
* @param array $options Parameters for parsing.
*
* @return ReferencesKeyword
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new ReferencesKeyword();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ----------------------[ table ]---------------------> 1
*
* 1 ---------------------[ columns ]--------------------> 2
*
* 2 ---------------------[ options ]--------------------> -1
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
* @var Token
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping whitespaces and comments.
if ($token->type === Token::TYPE_WHITESPACE || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($state === 0) {
$ret->table = $token->value;
$state = 1;
} else {
if ($state === 1) {
$ret->columns = ArrayFragment::parse($parser, $list)->values;
$state = 2;
} else {
if ($state === 2) {
$ret->options = OptionsFragment::parse($parser, $list, static::$REFERENCES_OPTIONS);
++$list->idx;
break;
}
}
}
}
--$list->idx;
return $ret;
}
/**
* @param Parser $parser The parser that serves as context.
* @param TokensList $list The list of tokens that are being parsed.
* @param array $options Parameters for parsing.
*
* @return DataTypeFragment[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new DataTypeFragment();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -------------------[ data type ]--------------------> 1
*
* 1 ----------------[ size and options ]----------------> 2
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
* @var Token
*/
$token = $list->tokens[$list->idx];
// Skipping whitespaces and comments.
if ($token->type === Token::TYPE_WHITESPACE || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($state === 0) {
$ret->name = strtoupper($token->value);
if ($token->type !== Token::TYPE_KEYWORD || !($token->flags & Token::FLAG_KEYWORD_DATA_TYPE)) {
$parser->error('Unrecognized data type.', $token);
}
$state = 1;
} elseif ($state === 1) {
if ($token->type === Token::TYPE_OPERATOR && $token->value === '(') {
$size = ArrayFragment::parse($parser, $list);
++$list->idx;
$ret->parameters = $ret->name === 'ENUM' || $ret->name === 'SET' ? $size->raw : $size->values;
}
$ret->options = OptionsFragment::parse($parser, $list, static::$DATA_TYPE_OPTIONS);
++$list->idx;
break;
}
}
if (empty($ret->name)) {
return null;
}
--$list->idx;
return $ret;
}
/**
* Parses the statements defined by the tokens list.
*
* @param Parser $parser The instance that requests parsing.
* @param TokensList $list The list of tokens to be parsed.
*
* @return void
*/
public function parse(Parser $parser, TokensList $list)
{
$this->first = $list->idx;
/**
* Whether options were parsed or not.
* For statements that do not have any options this is set to `true` by
* default.
* @var bool
*/
$parsedOptions = isset(static::$OPTIONS) ? false : true;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
* @var Token
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Only keywords are relevant here. Other parts of the query are
// processed in the functions below.
if ($token->type !== Token::TYPE_KEYWORD) {
continue;
}
/**
* The name of the class that is used for parsing.
* @var string
*/
$class = null;
/**
* The name of the field where the result of the parsing is stored.
* @var string
*/
$field = null;
/**
* Parser's options.
* @var array
*/
$options = array();
if (!empty(Parser::$KEYWORD_PARSERS[$token->value])) {
$class = Parser::$KEYWORD_PARSERS[$token->value]['class'];
$field = Parser::$KEYWORD_PARSERS[$token->value]['field'];
if (!empty(Parser::$KEYWORD_PARSERS[$token->value]['options'])) {
$options = Parser::$KEYWORD_PARSERS[$token->value]['options'];
}
}
if (!empty(Parser::$STATEMENT_PARSERS[$token->value])) {
if (!$parsedOptions) {
++$list->idx;
// Skipping keyword.
$this->options = OptionsFragment::parse($parser, $list, static::$OPTIONS);
$parsedOptions = true;
}
} else {
if ($class === null) {
// There is no parser for this keyword and isn't the beggining
// of a statement (so no options) either.
$parser->error('Unrecognized keyword "' . $token->value . '".', $token);
continue;
}
}
$this->before($parser, $list, $token);
// Parsing this keyword.
if ($class !== null) {
++$list->idx;
// Skipping keyword.
$this->{$field} = $class::parse($parser, $list, $options);
}
$this->after($parser, $list, $token);
}
$this->last = $list->idx--;
// Go back to last used token.
}
/**
* Parsing the `CREATE` statement.
*
* @param Parser $parser The instance that requests parsing.
* @param TokensList $list The list of tokens to be parsed.
* @param Token $token The token that is being parsed.
*
* @return void
*/
public function before(Parser $parser, TokensList $list, Token $token)
{
++$list->idx;
$this->name = CreateDefFragment::parse($parser, $list);
if ($this->options->has('TABLE')) {
++$list->idx;
$this->fields = FieldDefFragment::parse($parser, $list);
++$list->idx;
$this->entityOptions = OptionsFragment::parse($parser, $list, CreateDefFragment::$TABLE_OPTIONS);
} elseif ($this->options->has('PROCEDURE') || $this->options->has('FUNCTION')) {
++$list->idx;
$this->parameters = ParamDefFragment::parse($parser, $list);
if ($this->options->has('FUNCTION')) {
$token = $list->getNextOfType(Token::TYPE_KEYWORD);
if ($token->value !== 'RETURNS') {
$parser->error('\'RETURNS\' keyword was expected.', $token);
} else {
++$list->idx;
$this->return = DataTypeFragment::parse($parser, $list);
}
}
++$list->idx;
$this->entityOptions = OptionsFragment::parse($parser, $list, CreateDefFragment::$FUNC_OPTIONS);
++$list->idx;
$this->body = array();
for (; $list->idx < $list->count; ++$list->idx) {
$token = $list->tokens[$list->idx];
$this->body[] = $token;
if ($token->type === Token::TYPE_KEYWORD && $token->value === 'END') {
break;
}
}
}
}
/**
* @param Parser $parser The parser that serves as context.
* @param TokensList $list The list of tokens that are being parsed.
* @param array $options Parameters for parsing.
*
* @return FieldDefFragment[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new FieldDefFragment();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -----------------------[ ( ]------------------------> 1
*
* 1 --------------------[ CONSTRAINT ]------------------> 1
* 1 -----------------------[ key ]----------------------> 2
* 1 -------------[ constraint / column name ]-----------> 2
*
* 2 --------------------[ data type ]-------------------> 3
*
* 3 ---------------------[ options ]--------------------> 4
*
* 4 --------------------[ REFERENCES ]------------------> 4
*
* 5 ------------------------[ , ]-----------------------> 1
* 5 ------------------------[ ) ]-----------------------> -1
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
* @var Token
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping whitespaces and comments.
if ($token->type === Token::TYPE_WHITESPACE || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($state === 0) {
if ($token->type === Token::TYPE_OPERATOR && $token->value === '(') {
$state = 1;
}
} elseif ($state === 1) {
if ($token->type === Token::TYPE_KEYWORD && $token->value === 'CONSTRAINT') {
$expr->isConstraint = true;
} elseif ($token->type === Token::TYPE_KEYWORD && $token->flags & Token::FLAG_KEYWORD_KEY) {
$expr->key = KeyFragment::parse($parser, $list);
$state = 4;
} else {
$expr->name = $token->value;
if (!$expr->isConstraint) {
$state = 2;
}
}
} elseif ($state === 2) {
$expr->type = DataTypeFragment::parse($parser, $list);
$state = 3;
} elseif ($state === 3) {
$expr->options = OptionsFragment::parse($parser, $list, static::$FIELD_OPTIONS);
$state = 4;
} elseif ($state === 4) {
if ($token->type === Token::TYPE_KEYWORD && $token->value === 'REFERENCES') {
++$list->idx;
// Skipping keyword 'REFERENCES'.
$expr->references = ReferencesKeyword::parse($parser, $list);
} else {
--$list->idx;
}
$state = 5;
} else {
if ($state === 5) {
if (!empty($expr->type) || !empty($expr->key)) {
$ret[] = $expr;
}
$expr = new FieldDefFragment();
if ($token->value === ',') {
$state = 1;
continue;
} elseif ($token->value === ')') {
++$list->idx;
break;
}
}
}
}
// Last iteration was not saved.
if (!empty($expr->type) || !empty($expr->key)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
