Parse SassScript to a set of tokens in RPN
using the Shunting Yard Algorithm.
| public parse ( string $expression, SassContext $context, integer $environment = self::DEFAULT_ENV ) : array | ||
| $expression | string | expression to parse |
| $context | SassContext | the context in which the expression is parsed |
| $environment | integer | the environment in which the expression is parsed |
| 리턴 | array | tokens in RPN |
public static function colour_stops()
{
$args = func_get_args();
$list = array();
foreach ($args as $arg) {
if ($arg instanceof SassColour) {
$list[] = new CompassColourStop($arg);
} elseif ($arg instanceof SassString) {
# We get a string as the result of concatenation
# So we have to reparse the expression
$colour = $stop = null;
if (empty($parser)) {
$parser = new SassScriptParser();
}
$expr = $parser->parse($arg->value, SassScriptParser::$context);
$x = array_pop($expr);
if ($x instanceof SassColour) {
$colour = $x;
} elseif ($x instanceof SassScriptOperation) {
if ($x->operator != 'concat') {
# This should never happen.
throw new SassScriptFunctionException("Couldn't parse a colour stop from: {value}", array('{value}' => $arg->value), SassScriptParser::$context->node);
}
$colour = $expr[0];
$stop = $expr[1];
} else {
throw new SassScriptFunctionException("Couldn't parse a colour stop from: {value}", array('{value}' => $arg->value), SassScriptParser::$context->node);
}
$list[] = new CompassColourStop($colour, $stop);
} else {
throw new SassScriptFunctionException('Not a valid color stop: {arg}', array('{arg}' => $arg->value), SassScriptParser::$context->node);
}
}
return new CompassList($list);
}
