ComponentHelper.php

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<?php

/* Copyright (c) 2016 Richard Klees <richard.klees@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\UI\Implementation\Component;

trait ComponentHelper {
        protected function checkArg($which, $check, $message) {
                assert('is_string($which)');
                assert('is_bool($check)');
                assert('is_string($message)');
                if (!$check) {
                        throw new \InvalidArgumentException("Argument '$which': $message");
                }
        }

        protected function checkIntArg($which, $value) {
                $this->checkArg($which, is_int($value), $this->wrongTypeMessage("integer", $value));
        }

        protected function checkStringArg($which, $value) {
                $this->checkArg($which, is_string($value), $this->wrongTypeMessage("string", $value));
        }

        protected function checkArgInstanceOf($which, $value, $class) {
                $this->checkArg($which, $value instanceof $class, $this->wrongTypeMessage($class, $value));
        }

        protected function checkArgIsElement($which, $value, $array, $name) {
                if (!is_object($value)) {
                        $message = "expected $name, got '$value'";
                }
                else {
                        $message = "expected $name, got object."; 
                }
                $message = 
                $this->checkArg($which, in_array($value, $array), $message);
        }

        protected function checkArgList($which, array &$values, \Closure $check, \Closure $message) {
                $failed_k = null;
                $failed_v = null;
                foreach ($values as $key => $value) {
                        $ok = $check($key, $value);
                        if (!$ok) {
                                $failed_k = $key;
                                $failed_v = $value;
                                break;
                        }
                }

                if ($failed_k !== null) {
                        $m = $message($failed_k, $failed_v);
                }
                else {
                        $m = "";
                }

                $this->checkArg($which, $failed_k === null, $m);
        }

        protected function checkArgListElements($which, array &$values, &$classes) {
                $classes = $this->toArray($classes);
                $this->checkArgList
                        ( $which
                        , $values
                        , function($_, $value) use (&$classes) {
                                foreach ($classes as $cls) {
                                        if ($cls === "string" && is_string($value)) {
                                                return true;
                                        }
                                        if ($cls === "int" && is_int($value)) {
                                                return true;
                                        }
                                        else if ($value instanceof $cls) {
                                                return true;
                                        }
                                }
                                return false;
                        }
                        , function ($_, $failed) use (&$classes) {
                                return $this->wrongTypeMessage(implode(", ", $classes), $failed);
                        });
        }

        protected function toArray($value) {
                if (is_array($value)) {
                        return $value;
                }
                return array($value);
        }

        protected function wrongTypeMessage($expected, $value) {
                $type = gettype($value);
                if (!is_object($value) && !is_array($value)) {
                        return "expected $expected, got $type '$value'";
                }
                else {
                        if (is_object($value)) {
                                $type = get_class($value);
                        }
                        return "expected $expected, got $type";
                }
        }
}