lib/Twig/lib/Twig/Environment.php
public function compileSource($source, $name = null)
    {
        if (!$source instanceof Twig_Source) {
            @trigger_error(sprintf('Passing a string as the $source argument of %s() is deprecated since version 1.27. Pass a Twig_Source instance instead.', __METHOD__), E_USER_DEPRECATED);
            $source = new Twig_Source($source, $name);
        }

        try {
            return $this->compile($this->parse($this->tokenize($source)));
        } catch (Twig_Error $e) {
            $e->setSourceContext($source);
            throw $e;
        } catch (Exception $e) {
            throw new Twig_Error_Syntax(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $source, $e);
        }
    }
public function compileSource($source, $name = null)
    {
        if (!$source instanceof Twig_Source) {
            @trigger_error(sprintf('Passing a string as the $source argument of %s() is deprecated since version 1.27. Pass a Twig_Source instance instead.', __METHOD__), E_USER_DEPRECATED);
            $source = new Twig_Source($source, $name);
        }

        try {
            return $this->compile($this->parse($this->tokenize($source)));
        } catch (Twig_Error $e) {
            $e->setSourceContext($source);
            throw $e;
        } catch (Exception $e) {
            throw new Twig_Error_Syntax(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $source, $e);
        }
    }
Compiles a template source code.

@param string|Twig_Source $source The template source code
@param string             $name   The template name (deprecated)

@return string The compiled PHP source code

@throws Twig_Error_Syntax When there was an error during tokenizing, parsing or compiling