/**
* Parses a non-bracketed expression
*
* Returns a ClauseGroup for a multi-part expression, or returns a string for an
* expression containing just one (<col> <test> <value>) part
*/
private function parse($clause)
{
// If the input string is essentially empty then return null
if (trim($clause) == '') {
return null;
}
// Ensure that ANDs and ORs are not mixed
$strAnd = ClauseGroup::BOOLEAN_AND;
$strOr = ClauseGroup::BOOLEAN_OR;
$boolAnd = strpos($clause, " {$strAnd} ") !== false;
$boolOr = strpos($clause, " {$strOr} ") !== false;
if ($boolAnd && $boolOr) {
throw new SyntaxError("Need to bracket ANDs and ORs to indicate precedence in clause <{$clause}>");
}
if ($boolOr) {
$split = $strOr;
} elseif ($boolAnd) {
$split = $strAnd;
} else {
$split = null;
}
// If applicable, split the clause into subclauses and decide the type
if ($split) {
$subClauses = explode(" {$split} ", $clause);
} else {
$subClauses = array($clause);
}
$group = new ClauseGroup();
$group->setType($split);
// Then add all the subclauses in
foreach ($subClauses as $subClause) {
if (trim($subClause) != '') {
QuotedStringParser::insertStrings($subClause, $this->strings);
$group->addSubclause($subClause);
}
}
// If there is only one subclause, return a string rather than a ClauseGroup
/*
$subClauseArray = $group->getSubclauses();
if (count($subClauseArray) == 1)
{
return $subClauseArray[0];
}
else
{
return $group;
}*/
return $group;
}
$g1->setType(ClauseGroup::BOOLEAN_AND);
$t->ok($result->equal($g1), 'decode a valid bracketed string containing ANDs and ORs');
$clause1 = "person.age IN (17,18,19,20)";
$clause2 = "person.height IN (100, 101)";
$result = $ca->analyse($clause1);
$rClause1 = $result->getFirstSubclause();
$g = new ClauseGroup();
$g->addSubclause($rClause1);
$t->ok($result->equal($g), 'decode a simple IN statement');
try {
$clause = $clause1 . ' OR ' . $clause2;
$result = $ca->analyse($clause);
$clauses = $result->getSubclauses();
$g->addSubclause($clauses[1]);
$g->setType(ClauseGroup::BOOLEAN_OR);
$ok = $result->equal($g);
} catch (Exception $e) {
$ok = false;
}
$t->ok($ok, 'decode a two IN statements');
$clause = "person.name IN ('person.age IN (1, 2, 3)')";
try {
$result = $ca->analyse($clause);
$rClause = $result->getFirstSubclause();
$g = new ClauseGroup();
$g->addSubclause($rClause);
$ok = $result->equal($g);
} catch (Exception $e) {
$ok = false;
}
$t->ok($ok, 'decode a simple IN statement containing a misleading IN string');
