/**
* Tests ExpParser::parse
*/
public function testParse()
{
$this->dataContext['no_prefix_id']->Ee = 1;
$actualResult = ExpParser::parse($this->tokenStream, $this->dataContext);
$this->assertEquals(new Token(ExpType::$STRING, 'no_prefix_id.Ee > 0'), $actualResult);
$this->dataContext['no_prefix_id']->Ee = -1;
$actualResult = ExpParser::parse($this->tokenStream, $this->dataContext);
$this->assertEquals(new Token(ExpType::$STRING, 'no_prefix_id.Ee <= 0'), $actualResult);
}
/**
* Evaluates the given $expression using the $dataContext as variable source.
*
* Internally the ExpressionParser uses a infix to postfix conversion to easily
* be able to evaluate mathematical expressions
*
* @param string $expression
* @param array $dataContext
* @return string evaluated result or an exception of failure
*/
public static function evaluate($expression, $dataContext)
{
$outputTokens = ExpLexer::process($expression);
$result = ExpParser::parse($outputTokens, $dataContext);
return $result->value;
}
private static function findNextCloseSymbol($tokenStream, $startPos)
{
$stackDepth = 0;
for ($i = $startPos; $i < count($tokenStream); $i++) {
$token = $tokenStream[$i];
if ($stackDepth == 0 && ExpParser::isCloseSymbol($token, false)) {
break;
}
if (ExpParser::isOpenSymbol($token)) {
$stackDepth++;
}
if (ExpParser::isCloseSymbol($token)) {
$stackDepth--;
}
}
return $i;
}