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<?php
/**
* The Gravity Forms Query Condition class.
*/
class GF_Query_Condition {
/**
* @var string The chosen operator.
*/
private $_operator = null;
/**
* @var array Boolean combined expressions.
*/
private $_expressions = array();
/**
* @var mixed The left-hand expression.
*/
private $_left = null;
/**
* @var mixed The right-hand expression.
*/
private $_right = null;
/**
* @const string The AND operator.
*/
const _AND = 'AND';
/**
* @const string The AND operator.
*/
const _OR = 'OR';
/**
* @const string The less than operator.
*/
const LT = '<';
/**
* @const string The less than or equal to operator.
*/
const LTE = '<=';
/**
* @const string The greater than operator.
*/
const GT = '>';
/**
* @const string The greater than or equal to operator.
*/
const GTE = '>=';
/**
* @const string The equal to operator.
*/
const EQ = '=';
/**
* @const string The not equal to operator.
*/
const NEQ = '!=';
/**
* @const string The IN operator.
*/
const IN = 'IN';
/**
* @const string The NOT IN operator.
*/
const NIN = 'NOT IN';
/**
* @const string The LIKE operator.
*/
const LIKE = 'LIKE';
/**
* @const string The NOT LIKE operator.
*/
const NLIKE = 'NOT LIKE';
/**
* @const string The BETWEEN operator.
*/
const BETWEEN = 'BETWEEN';
/**
* @const string The NOT BETWEEN operator.
*/
const NBETWEEN = 'NOT BETWEEN';
/**
* @const string The inverse IN operator.
*/
const CONTAINS = 'CONTAINS';
/**
* @const string The inverse NIN operator.
*/
const NCONTAINS = 'NCONTAINS';
/**
* @const string The IS operator.
*/
const IS = 'IS';
/**
* @const string The IS NOT operator.
*/
const ISNOT = 'IS NOT';
/**
* @const string NULL.
*/
const NULL = 'NULL';
/**
* A condition.
*
* @param GF_Query_Column|GF_Query_Call|GF_Query_Literal|null $left The left-hand expression.
* @param string|null $operator The operator.
* @param GF_Query_Column|GF_Query_Call|GF_Query_Literal|GF_Query_Series|null $right The right-hand expression.
*
* @return GF_Query_Condition $this This condition.
*/
public function __construct( $left = null, $operator = null, $right = null ) {
$allowed_ops = array( self::LT, self::LTE, self::GT, self::GTE, self::EQ, self::NEQ, self::IN, self::NIN, self::LIKE, self::NLIKE, self::BETWEEN, self::NBETWEEN, self::CONTAINS, self::NCONTAINS, self::IS, self::ISNOT );
/**
* Left-hand expression, non Series.
*/
if ( self::is_valid_expression_type( $left ) && ! $left instanceof GF_Query_Series ) {
$this->_left = $left;
}
/**
* The operator.
*/
if ( in_array( $operator, $allowed_ops ) ) {
$this->_operator = $operator;
}
/**
* Right-hand expression, non Series.
*/
if ( self::is_valid_expression_type( $right ) ) {
$this->_right = $right;
}
}
/**
* Tie several conditions together with an AND relationship.
*
* Accepts any number of GF_Query_Condition objects.
*
* @return GF_Query_Condition The condition.
*/
public static function _and() {
$conditions = array();
foreach ( func_get_args() as $arg ) {
if ( $arg instanceof GF_Query_Condition ) {
$conditions[] = $arg;
}
}
$_this = new self();
$_this->_operator = self::_AND;
$_this->_expressions = $conditions;
return $_this;
}
/**
* Tie several conditions together with an OR relationship.
*
* Accepts any number of GF_Query_Condition objects.
*
* @return GF_Query_Condition The condition.
*/
public static function _or() {
$conditions = array();
foreach ( func_get_args() as $arg ) {
if ( $arg instanceof GF_Query_Condition ) {
$conditions[] = $arg;
}
}
$_this = new self();
$_this->_operator = self::_OR;
$_this->_expressions = $conditions;
return $_this;
}
/**
* Compile the expressions into a SQL string.
*
* @param GF_Query $query The query.
*
* @return string The SQL string.
*/
public function sql( $query ) {
global $wpdb;
/**
* Both expressions are given.
*/
if ( $this->operator && $this->left && $this->right ) {
/**
* Meta field.
*/
if ( $this->left instanceof GF_Query_Column && ( ! $this->left->is_entry_column() && ! $this->left->is_meta_column() ) && $this->left->field_id ) {
/**
* A meta field needs some extra conditions: "meta_key", "meta_value", and sometimes EXISTS.
*/
$alias = $query->_alias( $this->left->field_id, $this->left->source, 'm' );
if ( $this->left->field_id == GF_Query_Column::META ) {
// Global meta search doesn't require a meta_key clause.
$compare_condition = new self(
new GF_Query_Column( 'meta_value', $this->left->source, $alias ),
$this->operator,
$this->right
);
return $query->_where_unwrap( $compare_condition );
}
/**
* Multi-input fields are processed in a more complex way.
*
* If a non-specific input is requested (radio, checkboxes, usually)
* we have to include all the input ids in the query.
*/
if ( is_numeric( $this->left->field_id ) && intval( $this->left->field_id ) == $this->left->field_id ) {
if ( ( $field = GFFormsModel::get_field( GFAPI::get_form( $this->left->source ), $this->left->field_id ) ) && $field->get_entry_inputs() ) {
/**
* EQ and NEQ require an unordered comparison of all the values for the entry.
*/
if ( in_array( $this->operator, array( self::EQ, self::NEQ ) ) && $this->right instanceof GF_Query_Series ) {
$compare_conditions = array();
foreach ( $this->right->values as $literal ) {
$subquery = $wpdb->prepare( sprintf( "SELECT 1 FROM `%s` WHERE `meta_key` LIKE %%s AND `meta_value` = %s AND `entry_id` = `%s`.`id`",
GFFormsModel::get_entry_meta_table_name(), $literal->sql( $query ), $query->_alias( null, $this->left->source ) ),
sprintf( '%d.%%', $this->left->field_id ) );
$compare_condition = new self( new GF_Query_Call( sprintf( '%sEXISTS', $this->operator == self::NEQ ? 'NOT ' : '' ), array( $subquery ) ) );
$compare_conditions []= $compare_condition->sql( $query );
}
$subquery = $wpdb->prepare( sprintf( "SELECT COUNT(1) FROM `%s` WHERE `meta_key` LIKE %%s AND `entry_id` = `%s`.`id`",
GFFormsModel::get_entry_meta_table_name(), $query->_alias( null, $this->left->source ) ),
sprintf( '%d.%%', $this->left->field_id ) );
/**
* Add length comparison to make sure all the needed values are found
* and no extra ones exist.
*/
$compare_conditions []= sprintf( "(%s) %s %d", $subquery, $this->operator == self::NEQ ? '!=' : '=', count( $compare_conditions ) );
return sprintf( "(%s)", implode( $this->operator == self::NEQ ? ' OR ' : ' AND ', $compare_conditions ) );
/**
* Inverse contains.
*/
} elseif ( in_array( $this->operator, array( self::CONTAINS, self::NCONTAINS ) ) ) {
$subquery = $wpdb->prepare( sprintf( "SELECT 1 FROM `%s` WHERE `meta_key` LIKE %%s AND `meta_value` = %s AND `entry_id` = `%s`.`id`",
GFFormsModel::get_entry_meta_table_name(), $this->right->sql( $query ), $query->_alias( null, $this->left->source ) ),
sprintf( '%d.%%', $this->left->field_id ) );
$compare_condition = new self( new GF_Query_Call( sprintf( '%sEXISTS', $this->operator == self::NCONTAINS ? 'NOT ' : '' ), array( $subquery ) ) );
return $compare_condition->sql( $query );
/**
* One of.
*/
} elseif ( in_array( $this->operator, array( self::IN, self::NIN ) ) && $this->right instanceof GF_Query_Series ) {
$subquery = $wpdb->prepare( sprintf( "SELECT 1 FROM `%s` WHERE `meta_key` LIKE %%s AND `meta_value` IN (%s) AND `entry_id` = `%s`.`id`",
GFFormsModel::get_entry_meta_table_name(), str_replace( '%', '%%', $this->right->sql( $query, ', ' ) ), $query->_alias( null, $this->left->source ) ),
sprintf( '%d.%%', $this->left->field_id ) );
$compare_condition = new self( new GF_Query_Call( sprintf( '%sEXISTS', $this->operator == self::NIN ? 'NOT ' : '' ), array( $subquery ) ) );
return $compare_condition->sql( $query );
/**
* Everything else.
*/
} else {
$operator = $this->operator;
$is_negative = in_array( $operator, array( self::NLIKE, self::NBETWEEN, self::NEQ ) );
if ( $is_negative ) {
/**
* Convert operator to positive, since we're doing it the NOT EXISTS way.
*/
switch ( $operator ) {
case self::NLIKE:
$operator = self::LIKE;
break;
case self::NBETWEEN:
$operator = self::BETWEEN;
break;
case self::NEQ:
$operator = self::EQ;
break;
}
}
$subquery = $wpdb->prepare( sprintf( "SELECT 1 FROM `%s` WHERE `meta_key` LIKE %%s AND `meta_value` %s %s AND `entry_id` = `%s`.`id`",
GFFormsModel::get_entry_meta_table_name(), $operator, str_replace( '%', '%%', $this->right->sql( $query ) ), $query->_alias( null, $this->left->source ) ),
sprintf( '%d.%%', $this->left->field_id ) );
$compare_condition = new self( new GF_Query_Call( sprintf( '%sEXISTS', $is_negative ? 'NOT ' : '' ), array( $subquery ) ) );
return $compare_condition->sql( $query );
}
}
}
$compare_condition = self::_and(
new self(
new GF_Query_Column( 'meta_key', $this->left->source, $alias ),
self::EQ,
new GF_Query_Literal( $this->left->field_id )
),
new self(
new GF_Query_Column( 'meta_value', $this->left->source, $alias ),
$this->operator,
$this->right
)
);
if ( ( in_array( $this->operator, array( self::NIN, self::NBETWEEN ) ) && ! in_array( new GF_Query_Literal(''), $this->right->values ) )
|| ( $this->operator == self::NEQ && ! $this->right->value == '')
|| ( $this->operator == self::EQ && $this->right->value == '' )
) {
/**
* Empty string comparisons and negative comparisons need a NOT EXISTS clause to grab entries that
* don't have the value set in the first place.
*/
$subquery = $wpdb->prepare( sprintf( "SELECT 1 FROM `%s` WHERE `meta_key` = %%s AND `entry_id` = `%s`.`id`",
GFFormsModel::get_entry_meta_table_name(), $query->_alias( null, $this->left->source ) ), $this->left->field_id );
$not_exists = new self( new GF_Query_Call( 'NOT EXISTS', array( $subquery ) ) );
return $query->_where_unwrap( self::_or( $not_exists, $compare_condition ) );
}
return $query->_where_unwrap( $compare_condition );
}
if ( ( $left = $this->left_sql( $query ) ) && ( $right = $this->right_sql( $query ) ) ) {
if ( in_array( $this->operator, array( self::NBETWEEN, self::BETWEEN ) ) ) {
return "($left {$this->operator} $right)";
}
if ( $this->left instanceof GF_Query_Column && $this->left->is_nullable_entry_column() ) {
if ( ( $this->operator == self::EQ && empty ( $this->right->value ) ) || ( $this->operator == self::NEQ && ! empty ( $this->right->value ) ) ) {
$right .= ' OR ' . $left . ' IS NULL)';
$left = "($left";
}
}
if ( $this->left instanceof GF_Query_Column && $this->left->is_entry_column() && $this->left->source ) {
if ( $query->is_multisource() && $this->left->field_id != 'form_id' ) {
$alias = $query->_alias( null, $this->left->source );
$left = "(`$alias`.`form_id` = {$this->left->source} AND $left";
$right .= ')';
}
}
return "$left {$this->operator} $right";
}
}
if ( $this->left && ( $this->left instanceof GF_Query_Call || $this->left instanceof GF_Query_Column ) ) {
return $this->left_sql( $query );
}
return '';
}
/**
* Checks whether the expression is of a valid type.
*
* @param mixed $expression The expression to check.
*
* @return boolean Valid or not.
*/
public static function is_valid_expression_type( $expression ) {
return (
( $expression instanceof GF_Query_Literal ) ||
( $expression instanceof GF_Query_Column ) ||
( $expression instanceof GF_Query_Series ) ||
( $expression instanceof GF_Query_Call ) ||
( $expression === self::NULL )
);
}
/**
* The right expression.
*
* @return string The SQL string or null for the right expression.
*/
private function right_sql( $query ) {
/**
* (NOT) IN
*
* Only works with literal arrays, which can be made
* up of a Literal, Column or Call.
*/
if ( in_array( $this->operator, array( self::IN, self::NIN ) ) ) {
if ( ! $this->right instanceof GF_Query_Series ) {
return '';
}
return sprintf( '(%s)', $this->right->sql( $query, ', ' ) );
/**
* BETWEEN
*/
} elseif ( in_array( $this->operator, array( self::BETWEEN, self::NBETWEEN ) ) ) {
if ( ! $this->right instanceof GF_Query_Series ) {
return '';
}
return $this->right->sql( $query, ' AND ' );
} elseif ( in_array( $this->operator, array( self::IS, self::ISNOT ) ) ) {
if ( $this->right !== self::NULL ) {
return '';
}
return self::NULL;
}
return $this->right->sql( $query );
}
/**
* The left expression.
*
* @return string The SQL string or null for the left expression.
*/
private function left_sql( $query ) {
if ( $this->left instanceof GF_Query_Call ) {
$columns = array();
foreach ( $this->left->parameters as $c ) {
if ( $c instanceof GF_Query_Column ) {
$columns[] = $c;
}
}
/**
* Add a meta_key condition to a calls.
*/
if ( $columns ) {
$meta_key_conditions = array();
foreach ( $columns as $column ) {
$alias = $column->alias ? $column->alias : $query->_alias( $column->field_id, $column->source, 'm' );
$condition = new GF_Query_Condition(
new GF_Query_Column( 'meta_key', $column->source, $alias ),
GF_Query_Condition::EQ,
new GF_Query_Literal( $column->field_id )
);
$meta_key_conditions []= $condition->sql( $query );
}
return implode( ' AND ',
array_merge(
$meta_key_conditions,
array( $this->left->sql( $query ) )
)
);
}
}
return $this->left->sql( $query );
}
/**
* Retrieve all the columns present in the left, right clauses.
*
* @return array The columns.
*/
public function get_columns() {
$columns = array();
if ( $this->left instanceof GF_Query_Column ) {
$columns[] = $this->left;
}
if ( $this->right instanceof GF_Query_Column ) {
$columns[] = $this->right;
}
/**
* Support Calls
*/
if ( $this->left instanceof GF_Query_Call) {
$left_columns = array();
foreach ( $this->left->parameters as $c ) {
if ( $c instanceof GF_Query_Column ) {
$left_columns[] = $c;
}
}
$columns = array_merge( $columns, $left_columns );
}
/**
* Support series of columns.
*/
if ( $this->right instanceof GF_Query_Series ) {
$right_columns = array();
foreach ( $this->right->values as $c ) {
if ( $c instanceof GF_Query_Column ) {
$right_columns[] = $c;
}
}
$columns = array_merge( $columns, $right_columns );
}
return $columns;
}
/**
* Proxy read-only values.
*/
public function __get( $key ) {
switch ( $key ) :
case 'operator':
return $this->_operator;
case 'expressions':
return $this->_expressions;
case 'left':
return $this->_left;
case 'right':
return $this->_right;
case 'columns':
return $this->get_columns();
endswitch;
}
}
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