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drafting the new clause parser

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zYne 2007-08-07 20:41:33 +00:00
parent 643a3ea86b
commit 2468d4e78d
1 changed files with 81 additions and 0 deletions
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81
lib/Doctrine/Query.php
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@ -456,6 +456,87 @@ class Doctrine_Query extends Doctrine_Query_Abstract implements Countable
$this->pendingSubqueries[] = array($subquery, $alias);
}
/**
* parseClause
* parses given DQL clause
*
* this method handles three tasks:
*
* 1. Converts all DQL functions to their native SQL equivalents
* 2. Converts all component references to their table alias equivalents
* 3. Quotes all identifiers
*
* @return string SQL string
*/
public function parseClause($clause)
{
$terms = Doctrine_Tokenizer::clauseExplode($clause, array(' ', '+', '-', '*', '/'));
$str = '';
foreach ($terms as $term) {
$pos = strpos($term[0], '(');
if ($pos !== false) {
$name = substr($term[0], 0, $pos);
if ($name !== '') {
$argStr = substr($term[0], ($pos + 1), -1);
$args = array();
// parse args
foreach (Doctrine_Tokenizer::sqlExplode($argStr, ',') as $expr) {
$args[] = $this->parseClause($expr);
}
// convert DQL function to its RDBMS specific equivalent
try {
$expr = call_user_func_array(array($this->_conn->expression, $name), $args);
} catch(Doctrine_Expression_Exception $e) {
throw new Doctrine_Query_Exception('Unknown function ' . $func . '.');
}
$term[0] = $expr;
} else {
$term[0] = '(' . Doctrine_Tokenizer::bracketTrim($term[0]) . ')';
}
} else {
if (substr($term[0], 0, 1) !== "'" && substr($term[0], -1) !== "'") {
if (strpos($term[0], '.') !== false) {
if ( ! is_numeric($term[0])) {
$e = explode('.', $term[0]);
$field = array_pop($e);
$componentAlias = implode('.', $e);
// check the existence of the component alias
if ( ! isset($this->_aliasMap[$componentAlias])) {
throw new Doctrine_Query_Exception('Unknown component alias ' . $componentAlias);
}
$table = $this->_aliasMap[$componentAlias]['table'];
$field = $table->getColumnName($field);
// check column existence
if ( ! $table->hasColumn($field)) {
throw new Doctrine_Query_Exception('Unknown column ' . $field);
}
$tableAlias = $this->getTableAlias($componentAlias);
// build sql expression
$term[0] = $this->_conn->quoteIdentifier($tableAlias)
. '.'
. $this->_conn->quoteIdentifier($field);
}
}
}
}
$str .= $term[0] . $term[1];
}
return $str;
}
/**
* parseAggregateFunction
* parses an aggregate function and returns the parsed form