1 | <?php |
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2 | |||
3 | namespace SilverStripe\View; |
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4 | |||
5 | use ArrayIterator; |
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6 | use Exception; |
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7 | use InvalidArgumentException; |
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8 | use IteratorAggregate; |
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9 | use LogicException; |
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10 | use SilverStripe\Core\ClassInfo; |
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11 | use SilverStripe\Core\Config\Config; |
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12 | use SilverStripe\Core\Config\Configurable; |
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13 | use SilverStripe\Core\Convert; |
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14 | use SilverStripe\Core\Extensible; |
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15 | use SilverStripe\Core\Injector\Injectable; |
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16 | use SilverStripe\Core\Injector\Injector; |
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17 | use SilverStripe\Core\Manifest\ModuleResourceLoader; |
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18 | use SilverStripe\Dev\Debug; |
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19 | use SilverStripe\Dev\Deprecation; |
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20 | use SilverStripe\ORM\ArrayLib; |
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21 | use SilverStripe\ORM\FieldType\DBField; |
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22 | use SilverStripe\ORM\FieldType\DBHTMLText; |
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23 | use SilverStripe\View\SSViewer; |
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24 | use UnexpectedValueException; |
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25 | |||
26 | /** |
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27 | * A ViewableData object is any object that can be rendered into a template/view. |
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28 | * |
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29 | * A view interrogates the object being currently rendered in order to get data to render into the template. This data |
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30 | * is provided and automatically escaped by ViewableData. Any class that needs to be available to a view (controllers, |
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31 | * {@link DataObject}s, page controls) should inherit from this class. |
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32 | */ |
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33 | class ViewableData implements IteratorAggregate |
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34 | { |
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35 | use Extensible { |
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36 | defineMethods as extensibleDefineMethods; |
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37 | } |
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38 | use Injectable; |
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39 | use Configurable; |
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40 | |||
41 | /** |
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42 | * An array of objects to cast certain fields to. This is set up as an array in the format: |
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43 | * |
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44 | * <code> |
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45 | * public static $casting = array ( |
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46 | * 'FieldName' => 'ClassToCastTo(Arguments)' |
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47 | * ); |
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48 | * </code> |
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49 | * |
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50 | * @var array |
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51 | * @config |
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52 | */ |
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53 | private static $casting = array( |
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54 | 'CSSClasses' => 'Varchar' |
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55 | ); |
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56 | |||
57 | /** |
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58 | * The default object to cast scalar fields to if casting information is not specified, and casting to an object |
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59 | * is required. |
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60 | * |
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61 | * @var string |
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62 | * @config |
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63 | */ |
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64 | private static $default_cast = 'Text'; |
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65 | |||
66 | /** |
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67 | * @var array |
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68 | */ |
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69 | private static $casting_cache = array(); |
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70 | |||
71 | // ----------------------------------------------------------------------------------------------------------------- |
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72 | |||
73 | /** |
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74 | * A failover object to attempt to get data from if it is not present on this object. |
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75 | * |
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76 | * @var ViewableData |
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77 | */ |
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78 | protected $failover; |
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79 | |||
80 | /** |
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81 | * @var ViewableData |
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82 | */ |
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83 | protected $customisedObject; |
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84 | |||
85 | /** |
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86 | * @var array |
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87 | */ |
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88 | private $objCache = array(); |
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89 | |||
90 | public function __construct() |
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91 | { |
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92 | } |
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93 | |||
94 | // ----------------------------------------------------------------------------------------------------------------- |
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95 | |||
96 | // FIELD GETTERS & SETTERS ----------------------------------------------------------------------------------------- |
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97 | |||
98 | /** |
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99 | * Check if a field exists on this object or its failover. |
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100 | * Note that, unlike the core isset() implementation, this will return true if the property is defined |
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101 | * and set to null. |
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102 | * |
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103 | * @param string $property |
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104 | * @return bool |
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105 | */ |
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106 | public function __isset($property) |
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107 | { |
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108 | // getField() isn't a field-specific getter and shouldn't be treated as such |
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109 | if (strtolower($property) !== 'field' && $this->hasMethod($method = "get$property")) { |
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110 | return true; |
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111 | } |
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112 | if ($this->hasField($property)) { |
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113 | return true; |
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114 | } |
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115 | if ($this->failover) { |
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116 | return isset($this->failover->$property); |
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117 | } |
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118 | |||
119 | return false; |
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120 | } |
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121 | |||
122 | /** |
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123 | * Get the value of a property/field on this object. This will check if a method called get{$property} exists, then |
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124 | * check if a field is available using {@link ViewableData::getField()}, then fall back on a failover object. |
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125 | * |
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126 | * @param string $property |
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127 | * @return mixed |
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128 | */ |
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129 | public function __get($property) |
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130 | { |
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131 | // getField() isn't a field-specific getter and shouldn't be treated as such |
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132 | if (strtolower($property) !== 'field' && $this->hasMethod($method = "get$property")) { |
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133 | return $this->$method(); |
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134 | } |
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135 | if ($this->hasField($property)) { |
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136 | return $this->getField($property); |
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137 | } |
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138 | if ($this->failover) { |
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139 | return $this->failover->$property; |
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140 | } |
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141 | |||
142 | return null; |
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143 | } |
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144 | |||
145 | /** |
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146 | * Set a property/field on this object. This will check for the existence of a method called set{$property}, then |
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147 | * use the {@link ViewableData::setField()} method. |
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148 | * |
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149 | * @param string $property |
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150 | * @param mixed $value |
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151 | */ |
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152 | public function __set($property, $value) |
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153 | { |
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154 | $this->objCacheClear(); |
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155 | if ($this->hasMethod($method = "set$property")) { |
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156 | $this->$method($value); |
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157 | } else { |
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158 | $this->setField($property, $value); |
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159 | } |
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160 | } |
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161 | |||
162 | /** |
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163 | * Set a failover object to attempt to get data from if it is not present on this object. |
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164 | * |
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165 | * @param ViewableData $failover |
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166 | */ |
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167 | public function setFailover(ViewableData $failover) |
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168 | { |
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169 | // Ensure cached methods from previous failover are removed |
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170 | if ($this->failover) { |
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171 | $this->removeMethodsFrom('failover'); |
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172 | } |
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173 | |||
174 | $this->failover = $failover; |
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175 | $this->defineMethods(); |
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176 | } |
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177 | |||
178 | /** |
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179 | * Get the current failover object if set |
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180 | * |
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181 | * @return ViewableData|null |
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182 | */ |
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183 | public function getFailover() |
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184 | { |
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185 | return $this->failover; |
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186 | } |
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187 | |||
188 | /** |
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189 | * Check if a field exists on this object. This should be overloaded in child classes. |
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190 | * |
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191 | * @param string $field |
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192 | * @return bool |
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193 | */ |
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194 | public function hasField($field) |
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195 | { |
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196 | return property_exists($this, $field); |
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197 | } |
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198 | |||
199 | /** |
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200 | * Get the value of a field on this object. This should be overloaded in child classes. |
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201 | * |
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202 | * @param string $field |
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203 | * @return mixed |
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204 | */ |
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205 | public function getField($field) |
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206 | { |
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207 | return $this->$field; |
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208 | } |
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209 | |||
210 | /** |
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211 | * Set a field on this object. This should be overloaded in child classes. |
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212 | * |
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213 | * @param string $field |
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214 | * @param mixed $value |
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215 | * @return $this |
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216 | */ |
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217 | public function setField($field, $value) |
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218 | { |
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219 | $this->objCacheClear(); |
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220 | $this->$field = $value; |
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221 | return $this; |
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222 | } |
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223 | |||
224 | // ----------------------------------------------------------------------------------------------------------------- |
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225 | |||
226 | /** |
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227 | * Add methods from the {@link ViewableData::$failover} object, as well as wrapping any methods prefixed with an |
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228 | * underscore into a {@link ViewableData::cachedCall()}. |
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229 | * |
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230 | * @throws LogicException |
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231 | */ |
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232 | public function defineMethods() |
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233 | { |
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234 | if ($this->failover && !is_object($this->failover)) { |
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235 | throw new LogicException("ViewableData::\$failover set to a non-object"); |
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236 | } |
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237 | if ($this->failover) { |
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238 | $this->addMethodsFrom('failover'); |
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239 | |||
240 | if (isset($_REQUEST['debugfailover'])) { |
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241 | $class = static::class; |
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242 | $failoverClass = get_class($this->failover); |
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243 | Debug::message("$class created with a failover class of {$failoverClass}"); |
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244 | } |
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245 | } |
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246 | $this->extensibleDefineMethods(); |
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247 | } |
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248 | |||
249 | /** |
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250 | * Merge some arbitrary data in with this object. This method returns a {@link ViewableData_Customised} instance |
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251 | * with references to both this and the new custom data. |
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252 | * |
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253 | * Note that any fields you specify will take precedence over the fields on this object. |
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254 | * |
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255 | * @param array|ViewableData $data |
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256 | * @return ViewableData_Customised |
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257 | */ |
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258 | public function customise($data) |
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259 | { |
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260 | if (is_array($data) && (empty($data) || ArrayLib::is_associative($data))) { |
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261 | $data = new ArrayData($data); |
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262 | } |
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263 | |||
264 | if ($data instanceof ViewableData) { |
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265 | return new ViewableData_Customised($this, $data); |
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266 | } |
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267 | |||
268 | throw new InvalidArgumentException( |
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269 | 'ViewableData->customise(): $data must be an associative array or a ViewableData instance' |
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270 | ); |
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271 | } |
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272 | |||
273 | /** |
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274 | * Return true if this object "exists" i.e. has a sensible value |
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275 | * |
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276 | * This method should be overriden in subclasses to provide more context about the classes state. For example, a |
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277 | * {@link DataObject} class could return false when it is deleted from the database |
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278 | * |
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279 | * @return bool |
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280 | */ |
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281 | public function exists() |
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282 | { |
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283 | return true; |
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284 | } |
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285 | |||
286 | /** |
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287 | * @return string the class name |
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288 | */ |
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289 | public function __toString() |
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290 | { |
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291 | return static::class; |
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292 | } |
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293 | |||
294 | /** |
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295 | * @return ViewableData |
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296 | */ |
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297 | public function getCustomisedObj() |
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298 | { |
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299 | return $this->customisedObject; |
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300 | } |
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301 | |||
302 | /** |
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303 | * @param ViewableData $object |
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304 | */ |
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305 | public function setCustomisedObj(ViewableData $object) |
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306 | { |
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307 | $this->customisedObject = $object; |
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308 | } |
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309 | |||
310 | // CASTING --------------------------------------------------------------------------------------------------------- |
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311 | |||
312 | /** |
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313 | * Return the "casting helper" (a piece of PHP code that when evaluated creates a casted value object) |
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314 | * for a field on this object. This helper will be a subclass of DBField. |
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315 | * |
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316 | * @param string $field |
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317 | * @return string Casting helper As a constructor pattern, and may include arguments. |
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318 | * @throws Exception |
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319 | */ |
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320 | public function castingHelper($field) |
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321 | { |
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322 | $specs = static::config()->get('casting'); |
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323 | if (isset($specs[$field])) { |
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324 | return $specs[$field]; |
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325 | } |
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326 | |||
327 | // If no specific cast is declared, fall back to failover. |
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328 | // Note that if there is a failover, the default_cast will always |
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329 | // be drawn from this object instead of the top level object. |
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330 | $failover = $this->getFailover(); |
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331 | if ($failover) { |
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332 | $cast = $failover->castingHelper($field); |
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333 | if ($cast) { |
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334 | return $cast; |
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335 | } |
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336 | } |
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337 | |||
338 | // Fall back to default_cast |
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339 | $default = $this->config()->get('default_cast'); |
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340 | if (empty($default)) { |
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341 | throw new Exception("No default_cast"); |
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342 | } |
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343 | return $default; |
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344 | } |
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345 | |||
346 | /** |
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347 | * Get the class name a field on this object will be casted to. |
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348 | * |
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349 | * @param string $field |
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350 | * @return string |
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351 | */ |
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352 | public function castingClass($field) |
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353 | { |
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354 | // Strip arguments |
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355 | $spec = $this->castingHelper($field); |
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356 | return trim(strtok($spec, '(')); |
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357 | } |
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358 | |||
359 | /** |
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360 | * Return the string-format type for the given field. |
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361 | * |
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362 | * @param string $field |
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363 | * @return string 'xml'|'raw' |
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364 | */ |
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365 | public function escapeTypeForField($field) |
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366 | { |
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367 | $class = $this->castingClass($field) ?: $this->config()->get('default_cast'); |
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368 | |||
369 | // TODO: It would be quicker not to instantiate the object, but to merely |
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370 | // get its class from the Injector |
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371 | /** @var DBField $type */ |
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372 | $type = Injector::inst()->get($class, true); |
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373 | return $type->config()->get('escape_type'); |
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374 | } |
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375 | |||
376 | // TEMPLATE ACCESS LAYER ------------------------------------------------------------------------------------------- |
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377 | |||
378 | /** |
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379 | * Render this object into the template, and get the result as a string. You can pass one of the following as the |
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380 | * $template parameter: |
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381 | * - a template name (e.g. Page) |
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382 | * - an array of possible template names - the first valid one will be used |
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383 | * - an SSViewer instance |
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384 | * |
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385 | * @param string|array|SSViewer $template the template to render into |
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386 | * @param array $customFields fields to customise() the object with before rendering |
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387 | * @return DBHTMLText |
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388 | */ |
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389 | public function renderWith($template, $customFields = null) |
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390 | { |
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391 | if (!is_object($template)) { |
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392 | $template = SSViewer::create($template); |
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393 | } |
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394 | |||
395 | $data = $this->getCustomisedObj() ?: $this; |
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396 | |||
397 | if ($customFields instanceof ViewableData) { |
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398 | $data = $data->customise($customFields); |
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399 | } |
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400 | if ($template instanceof SSViewer) { |
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401 | return $template->process($data, is_array($customFields) ? $customFields : null); |
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402 | } |
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403 | |||
404 | throw new UnexpectedValueException( |
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405 | "ViewableData::renderWith(): unexpected " . get_class($template) . " object, expected an SSViewer instance" |
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|
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406 | ); |
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407 | } |
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408 | |||
409 | /** |
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410 | * Generate the cache name for a field |
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411 | * |
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412 | * @param string $fieldName Name of field |
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413 | * @param array $arguments List of optional arguments given |
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414 | * @return string |
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415 | */ |
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416 | protected function objCacheName($fieldName, $arguments) |
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417 | { |
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418 | return $arguments |
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419 | ? $fieldName . ":" . var_export($arguments, true) |
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420 | : $fieldName; |
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421 | } |
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422 | |||
423 | /** |
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424 | * Get a cached value from the field cache |
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425 | * |
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426 | * @param string $key Cache key |
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427 | * @return mixed |
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428 | */ |
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429 | protected function objCacheGet($key) |
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430 | { |
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431 | if (isset($this->objCache[$key])) { |
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432 | return $this->objCache[$key]; |
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433 | } |
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434 | return null; |
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435 | } |
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436 | |||
437 | /** |
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438 | * Store a value in the field cache |
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439 | * |
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440 | * @param string $key Cache key |
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441 | * @param mixed $value |
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442 | * @return $this |
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443 | */ |
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444 | protected function objCacheSet($key, $value) |
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445 | { |
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446 | $this->objCache[$key] = $value; |
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447 | return $this; |
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448 | } |
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449 | |||
450 | /** |
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451 | * Clear object cache |
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452 | * |
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453 | * @return $this |
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454 | */ |
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455 | protected function objCacheClear() |
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456 | { |
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457 | $this->objCache = []; |
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458 | return $this; |
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459 | } |
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460 | |||
461 | /** |
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462 | * Get the value of a field on this object, automatically inserting the value into any available casting objects |
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463 | * that have been specified. |
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464 | * |
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465 | * @param string $fieldName |
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466 | * @param array $arguments |
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467 | * @param bool $cache Cache this object |
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468 | * @param string $cacheName a custom cache name |
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469 | * @return Object|DBField |
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470 | */ |
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471 | public function obj($fieldName, $arguments = [], $cache = false, $cacheName = null) |
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472 | { |
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473 | if (!$cacheName && $cache) { |
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474 | $cacheName = $this->objCacheName($fieldName, $arguments); |
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475 | } |
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476 | |||
477 | // Check pre-cached value |
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478 | $value = $cache ? $this->objCacheGet($cacheName) : null; |
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479 | if ($value !== null) { |
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480 | return $value; |
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481 | } |
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482 | |||
483 | // Load value from record |
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484 | if ($this->hasMethod($fieldName)) { |
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485 | $value = call_user_func_array(array($this, $fieldName), $arguments ?: []); |
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486 | } else { |
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487 | $value = $this->$fieldName; |
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488 | } |
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489 | |||
490 | // Cast object |
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491 | if (!is_object($value)) { |
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492 | // Force cast |
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493 | $castingHelper = $this->castingHelper($fieldName); |
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494 | $valueObject = Injector::inst()->create($castingHelper, $fieldName); |
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495 | $valueObject->setValue($value, $this); |
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496 | $value = $valueObject; |
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497 | } |
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498 | |||
499 | // Record in cache |
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500 | if ($cache) { |
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501 | $this->objCacheSet($cacheName, $value); |
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502 | } |
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503 | |||
504 | return $value; |
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505 | } |
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506 | |||
507 | /** |
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508 | * A simple wrapper around {@link ViewableData::obj()} that automatically caches the result so it can be used again |
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509 | * without re-running the method. |
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510 | * |
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511 | * @param string $field |
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512 | * @param array $arguments |
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513 | * @param string $identifier an optional custom cache identifier |
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514 | * @return Object|DBField |
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515 | */ |
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516 | public function cachedCall($field, $arguments = [], $identifier = null) |
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517 | { |
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518 | return $this->obj($field, $arguments, true, $identifier); |
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519 | } |
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520 | |||
521 | /** |
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522 | * Checks if a given method/field has a valid value. If the result is an object, this will return the result of the |
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523 | * exists method, otherwise will check if the result is not just an empty paragraph tag. |
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524 | * |
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525 | * @param string $field |
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526 | * @param array $arguments |
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527 | * @param bool $cache |
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528 | * @return bool |
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529 | */ |
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530 | public function hasValue($field, $arguments = [], $cache = true) |
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531 | { |
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532 | $result = $this->obj($field, $arguments, $cache); |
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533 | return $result->exists(); |
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534 | } |
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535 | |||
536 | /** |
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537 | * Get the string value of a field on this object that has been suitable escaped to be inserted directly into a |
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538 | * template. |
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539 | * |
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540 | * @param string $field |
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541 | * @param array $arguments |
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542 | * @param bool $cache |
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543 | * @return string |
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544 | */ |
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545 | public function XML_val($field, $arguments = [], $cache = false) |
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546 | { |
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547 | $result = $this->obj($field, $arguments, $cache); |
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548 | // Might contain additional formatting over ->XML(). E.g. parse shortcodes, nl2br() |
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549 | return $result->forTemplate(); |
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550 | } |
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551 | |||
552 | /** |
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553 | * Get an array of XML-escaped values by field name |
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554 | * |
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555 | * @param array $fields an array of field names |
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556 | * @return array |
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557 | */ |
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558 | public function getXMLValues($fields) |
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559 | { |
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560 | $result = []; |
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561 | |||
562 | foreach ($fields as $field) { |
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563 | $result[$field] = $this->XML_val($field); |
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564 | } |
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565 | |||
566 | return $result; |
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567 | } |
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568 | |||
569 | // ITERATOR SUPPORT ------------------------------------------------------------------------------------------------ |
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570 | |||
571 | /** |
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572 | * Return a single-item iterator so you can iterate over the fields of a single record. |
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573 | * |
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574 | * This is useful so you can use a single record inside a <% control %> block in a template - and then use |
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575 | * to access individual fields on this object. |
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576 | * |
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577 | * @return ArrayIterator |
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578 | */ |
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579 | public function getIterator() |
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580 | { |
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581 | return new ArrayIterator([$this]); |
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582 | } |
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583 | |||
584 | // UTILITY METHODS ------------------------------------------------------------------------------------------------- |
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585 | |||
586 | /** |
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587 | * Find appropriate templates for SSViewer to use to render this object |
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588 | * |
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589 | * @param string $suffix |
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590 | * @return array |
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591 | */ |
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592 | public function getViewerTemplates($suffix = '') |
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593 | { |
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594 | return SSViewer::get_templates_by_class(static::class, $suffix, self::class); |
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595 | } |
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596 | |||
597 | /** |
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598 | * When rendering some objects it is necessary to iterate over the object being rendered, to do this, you need |
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599 | * access to itself. |
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600 | * |
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601 | * @return ViewableData |
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602 | */ |
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603 | public function Me() |
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604 | { |
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605 | return $this; |
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606 | } |
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607 | |||
608 | /** |
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609 | * Return the directory if the current active theme (relative to the site root). |
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610 | * |
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611 | * This method is useful for things such as accessing theme images from your template without hardcoding the theme |
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612 | * page - e.g. <img src="$ThemeDir/images/something.gif">. |
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613 | * |
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614 | * This method should only be used when a theme is currently active. However, it will fall over to the current |
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615 | * project directory. |
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616 | * |
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617 | * @return string URL to the current theme |
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618 | * @deprecated 4.0.0:5.0.0 Use $resourcePath or $resourceURL template helpers instead |
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619 | */ |
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620 | public function ThemeDir() |
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621 | { |
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622 | Deprecation::notice('5.0', 'Use $resourcePath or $resourceURL template helpers instead'); |
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623 | $themes = SSViewer::get_themes(); |
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624 | foreach ($themes as $theme) { |
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625 | // Skip theme sets |
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626 | if (strpos($theme, '$') === 0) { |
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627 | continue; |
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628 | } |
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629 | // Map theme path to url |
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630 | $themePath = ThemeResourceLoader::inst()->getPath($theme); |
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631 | return ModuleResourceLoader::resourceURL($themePath); |
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632 | } |
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633 | |||
634 | return project(); |
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635 | } |
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636 | |||
637 | /** |
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638 | * Get part of the current classes ancestry to be used as a CSS class. |
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639 | * |
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640 | * This method returns an escaped string of CSS classes representing the current classes ancestry until it hits a |
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641 | * stop point - e.g. "Page DataObject ViewableData". |
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642 | * |
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643 | * @param string $stopAtClass the class to stop at (default: ViewableData) |
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644 | * @return string |
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645 | * @uses ClassInfo |
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646 | */ |
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647 | public function CSSClasses($stopAtClass = self::class) |
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648 | { |
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649 | $classes = []; |
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650 | $classAncestry = array_reverse(ClassInfo::ancestry(static::class)); |
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651 | $stopClasses = ClassInfo::ancestry($stopAtClass); |
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652 | |||
653 | foreach ($classAncestry as $class) { |
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654 | if (in_array($class, $stopClasses)) { |
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655 | break; |
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656 | } |
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657 | $classes[] = $class; |
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658 | } |
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659 | |||
660 | // optionally add template identifier |
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661 | if (isset($this->template) && !in_array($this->template, $classes)) { |
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662 | $classes[] = $this->template; |
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663 | } |
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664 | |||
665 | // Strip out namespaces |
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666 | $classes = preg_replace('#.*\\\\#', '', $classes); |
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667 | |||
668 | return Convert::raw2att(implode(' ', $classes)); |
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669 | } |
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670 | |||
671 | /** |
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672 | * Return debug information about this object that can be rendered into a template |
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673 | * |
||
674 | * @return ViewableData_Debugger |
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675 | */ |
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676 | public function Debug() |
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677 | { |
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678 | return new ViewableData_Debugger($this); |
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679 | } |
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680 | } |
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681 |