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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace frictionlessdata\datapackage\Validators;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use frictionlessdata\datapackage\Registry;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * validate a datapackage descriptor  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * checks the profile attribute to determine which schema to validate with.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class DatapackageValidator extends BaseValidator  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getSchemaValidationErrorClass()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return 'frictionlessdata\\datapackage\\Validators\\DatapackageValidationError';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function getValidationProfile()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return Registry::getDatapackageValidationProfile($this->descriptor);  | 
            
                            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function getDescriptorForValidation()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // add base path to uri fields - it runs before validations, so need to validate the attributes we need  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // TODO: find a more elegant way to do it with support for registring custom url fields  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $descriptor = clone $this->descriptor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($descriptor->resources) && is_array($descriptor->resources)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($descriptor->resources as &$resource) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (is_object($resource)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $resource = clone $resource;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    if (isset($resource->path) && is_array($resource->path)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        foreach ($resource->path as &$url) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            if (is_string($url)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                                $url = 'file://'.$url;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $descriptor;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function validateSchema()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::validateSchema();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->getValidationProfile() != 'data-package') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            // all schemas must be an extension of datapackage spec  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->validateSchemaUrl(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->convertValidationSchemaFilenameToUrl(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $this->getJsonSchemaFileFromRegistry('data-package') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function validateKeys()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->descriptor->resources as $resourceDescriptor) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($this->resourceValidate($resourceDescriptor) as $error) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->errors[] = $error;  | 
            
                            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function resourceValidate($resourceDescriptor)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return ResourceValidator::validate($resourceDescriptor, $this->basePath);  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function getJsonSchemaFileFromRegistry($profile)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($filename = Registry::getJsonSchemaFile($profile)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $filename;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return parent::getJsonSchemaFileFromRegistry($profile);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: