CRM/Core/CodeGen/Specification.php

   1 <?php
   2
   3 /**
   4  * Read the schema specification and parse into internal data structures
   5  */
   6 class CRM_Core_CodeGen_Specification {
   7   public $tables;
   8   public $database;
   9
  10   protected $classNames;
  11
  12   /**
  13    * Read and parse.
  14    *
  15    * @param $schemaPath
  16    * @param string $buildVersion
  17    *   Which version of the schema to build.
  18    * @param bool $verbose
  19    */
  20   public function parse($schemaPath, $buildVersion, $verbose = TRUE) {
  21     $this->buildVersion = $buildVersion;
  22
  23     if ($verbose) {
  24       echo "Parsing schema description " . $schemaPath . "\n";
  25     }
  26     $dbXML = CRM_Core_CodeGen_Util_Xml::parse($schemaPath);
  27
  28     if ($verbose) {
  29       echo "Extracting database information\n";
  30     }
  31     $this->database = &$this->getDatabase($dbXML);
  32
  33     $this->classNames = [];
  34
  35     // TODO: peel DAO-specific stuff out of getTables, and spec reading into its own class
  36     if ($verbose) {
  37       echo "Extracting table information\n";
  38     }
  39     $this->tables = $this->getTables($dbXML, $this->database);
  40
  41     $this->resolveForeignKeys($this->tables, $this->classNames);
  42     $this->tables = $this->orderTables($this->tables);
  43
  44     // add archive tables here
  45     foreach ($this->tables as $name => $table) {
  46       if ($table['archive'] == 'true') {
  47         $name = 'archive_' . $table['name'];
  48         $table['name'] = $name;
  49         $table['archive'] = 'false';
  50         if (isset($table['foreignKey'])) {
  51           foreach ($table['foreignKey'] as $fkName => $fkValue) {
  52             if ($this->tables[$fkValue['table']]['archive'] == 'true') {
  53               $table['foreignKey'][$fkName]['table'] = 'archive_' . $table['foreignKey'][$fkName]['table'];
  54               $table['foreignKey'][$fkName]['uniqName']
  55                 = str_replace('FK_', 'FK_archive_', $table['foreignKey'][$fkName]['uniqName']);
  56             }
  57           }
  58           $archiveTables[$name] = $table;
  59         }
  60       }
  61     }
  62   }
  63
  64   /**
  65    * @param $dbXML
  66    *
  67    * @return array
  68    */
  69   public function &getDatabase(&$dbXML) {
  70     $database = ['name' => trim((string ) $dbXML->name)];
  71
  72     $attributes = '';
  73     $this->checkAndAppend($attributes, $dbXML, 'character_set', 'DEFAULT CHARACTER SET ', '');
  74     $this->checkAndAppend($attributes, $dbXML, 'collate', 'COLLATE ', '');
  75     $database['attributes'] = $attributes;
  76
  77     $tableAttributes_modern = $tableAttributes_simple = '';
  78     $this->checkAndAppend($tableAttributes_modern, $dbXML, 'table_type', 'ENGINE=', '');
  79     $this->checkAndAppend($tableAttributes_simple, $dbXML, 'table_type', 'TYPE=', '');
  80     $database['tableAttributes_modern'] = trim($tableAttributes_modern . ' ' . $attributes);
  81     $database['tableAttributes_simple'] = trim($tableAttributes_simple);
  82
  83     $database['comment'] = $this->value('comment', $dbXML, '');
  84
  85     return $database;
  86   }
  87
  88   /**
  89    * @param $dbXML
  90    * @param $database
  91    *
  92    * @return array
  93    */
  94   public function getTables($dbXML, &$database) {
  95     $tables = [];
  96     foreach ($dbXML->tables as $tablesXML) {
  97       foreach ($tablesXML->table as $tableXML) {
  98         if ($this->value('drop', $tableXML, 0) > 0 && version_compare($this->value('drop', $tableXML, 0), $this->buildVersion, '<=')) {
  99           continue;
 100         }
 101
 102         if (version_compare($this->value('add', $tableXML, 0), $this->buildVersion, '<=')) {
 103           $this->getTable($tableXML, $database, $tables);
 104         }
 105       }
 106     }
 107
 108     return $tables;
 109   }
 110
 111   /**
 112    * @param $tables
 113    * @param string $classNames
 114    */
 115   public function resolveForeignKeys(&$tables, &$classNames) {
 116     foreach (array_keys($tables) as $name) {
 117       $this->resolveForeignKey($tables, $classNames, $name);
 118     }
 119   }
 120
 121   /**
 122    * @param $tables
 123    * @param string $classNames
 124    * @param string $name
 125    */
 126   public function resolveForeignKey(&$tables, &$classNames, $name) {
 127     if (!array_key_exists('foreignKey', $tables[$name])) {
 128       return;
 129     }
 130
 131     foreach (array_keys($tables[$name]['foreignKey']) as $fkey) {
 132       $ftable = $tables[$name]['foreignKey'][$fkey]['table'];
 133       if (!array_key_exists($ftable, $classNames)) {
 134         echo "$ftable is not a valid foreign key table in $name\n";
 135         continue;
 136       }
 137       $tables[$name]['foreignKey'][$fkey]['className'] = $classNames[$ftable];
 138       $tables[$name]['foreignKey'][$fkey]['fileName'] = str_replace('_', '/', $classNames[$ftable]) . '.php';
 139       $tables[$name]['fields'][$fkey]['FKClassName'] = $classNames[$ftable];
 140     }
 141   }
 142
 143   /**
 144    * @param $tables
 145    *
 146    * @return array
 147    */
 148   public function orderTables(&$tables) {
 149     $ordered = [];
 150
 151     while (!empty($tables)) {
 152       foreach (array_keys($tables) as $name) {
 153         if ($this->validTable($tables, $ordered, $name)) {
 154           $ordered[$name] = $tables[$name];
 155           unset($tables[$name]);
 156         }
 157       }
 158     }
 159     return $ordered;
 160   }
 161
 162   /**
 163    * @param $tables
 164    * @param int $valid
 165    * @param string $name
 166    *
 167    * @return bool
 168    */
 169   public function validTable(&$tables, &$valid, $name) {
 170     if (!array_key_exists('foreignKey', $tables[$name])) {
 171       return TRUE;
 172     }
 173
 174     foreach (array_keys($tables[$name]['foreignKey']) as $fkey) {
 175       $ftable = $tables[$name]['foreignKey'][$fkey]['table'];
 176       if (!array_key_exists($ftable, $valid) && $ftable !== $name) {
 177         return FALSE;
 178       }
 179     }
 180     return TRUE;
 181   }
 182
 183   /**
 184    * @param $tableXML
 185    * @param $database
 186    * @param $tables
 187    */
 188   public function getTable($tableXML, &$database, &$tables) {
 189     $name = trim((string ) $tableXML->name);
 190     $klass = trim((string ) $tableXML->class);
 191     $base = $this->value('base', $tableXML);
 192     $sourceFile = "xml/schema/{$base}/{$klass}.xml";
 193     $daoPath = "{$base}/DAO/";
 194     $baoPath = __DIR__ . '/../../../' . str_replace(' ', '', "{$base}/BAO/");
 195     $useBao = $this->value('useBao', $tableXML, file_exists($baoPath . $klass . '.php'));
 196     $pre = str_replace('/', '_', $daoPath);
 197     $this->classNames[$name] = $pre . $klass;
 198
 199     $localizable = FALSE;
 200     foreach ($tableXML->field as $fieldXML) {
 201       if ($fieldXML->localizable) {
 202         $localizable = TRUE;
 203         break;
 204       }
 205     }
 206
 207     $titleFromClass = preg_replace('/([a-z])([A-Z])/', '$1 $2', $klass);
 208     $table = [
 209       'name' => $name,
 210       'base' => $daoPath,
 211       'sourceFile' => $sourceFile,
 212       'fileName' => $klass . '.php',
 213       'objectName' => $klass,
 214       'title' => $tableXML->title ?? $titleFromClass,
 215       'titlePlural' => $tableXML->titlePlural ?? CRM_Utils_String::pluralize($tableXML->title ?? $titleFromClass),
 216       'icon' => $tableXML->icon ?? NULL,
 217       'add' => $tableXML->add ?? NULL,
 218       'paths' => (array) ($tableXML->paths ?? []),
 219       'labelName' => substr($name, 8),
 220       'className' => $this->classNames[$name],
 221       'bao' => ($useBao ? str_replace('DAO', 'BAO', $this->classNames[$name]) : $this->classNames[$name]),
 222       'entity' => $klass,
 223       'attributes_simple' => trim($database['tableAttributes_simple']),
 224       'attributes_modern' => trim($database['tableAttributes_modern']),
 225       'comment' => $this->value('comment', $tableXML),
 226       'localizable' => $localizable,
 227       'log' => $this->value('log', $tableXML, 'false'),
 228       'archive' => $this->value('archive', $tableXML, 'false'),
 229     ];
 230
 231     $fields = [];
 232     foreach ($tableXML->field as $fieldXML) {
 233       if ($this->value('drop', $fieldXML, 0) > 0 && version_compare($this->value('drop', $fieldXML, 0), $this->buildVersion, '<=')) {
 234         continue;
 235       }
 236
 237       if (version_compare($this->value('add', $fieldXML, 0), $this->buildVersion, '<=')) {
 238         $this->getField($fieldXML, $fields);
 239       }
 240     }
 241
 242     $table['fields'] = &$fields;
 243
 244     if ($this->value('primaryKey', $tableXML)) {
 245       $this->getPrimaryKey($tableXML->primaryKey, $fields, $table);
 246     }
 247
 248     if ($this->value('index', $tableXML)) {
 249       $index = [];
 250       foreach ($tableXML->index as $indexXML) {
 251         if ($this->value('drop', $indexXML, 0) > 0 && version_compare($this->value('drop', $indexXML, 0), $this->buildVersion, '<=')) {
 252           continue;
 253         }
 254
 255         $this->getIndex($indexXML, $fields, $index);
 256       }
 257       CRM_Core_BAO_SchemaHandler::addIndexSignature($name, $index);
 258       $table['index'] = &$index;
 259     }
 260
 261     if ($this->value('foreignKey', $tableXML)) {
 262       $foreign = [];
 263       foreach ($tableXML->foreignKey as $foreignXML) {
 264
 265         if ($this->value('drop', $foreignXML, 0) > 0 && version_compare($this->value('drop', $foreignXML, 0), $this->buildVersion, '<=')) {
 266           continue;
 267         }
 268         if (version_compare($this->value('add', $foreignXML, 0), $this->buildVersion, '<=')) {
 269           $this->getForeignKey($foreignXML, $fields, $foreign, $name);
 270         }
 271       }
 272       $table['foreignKey'] = &$foreign;
 273     }
 274
 275     if ($this->value('dynamicForeignKey', $tableXML)) {
 276       $dynamicForeign = [];
 277       foreach ($tableXML->dynamicForeignKey as $foreignXML) {
 278         if ($this->value('drop', $foreignXML, 0) > 0 && version_compare($this->value('drop', $foreignXML, 0), $this->buildVersion, '<=')) {
 279           continue;
 280         }
 281         if (version_compare($this->value('add', $foreignXML, 0), $this->buildVersion, '<=')) {
 282           $this->getDynamicForeignKey($foreignXML, $dynamicForeign, $name);
 283         }
 284       }
 285       $table['dynamicForeignKey'] = $dynamicForeign;
 286     }
 287
 288     $tables[$name] = &$table;
 289   }
 290
 291   /**
 292    * @param $fieldXML
 293    * @param $fields
 294    */
 295   public function getField(&$fieldXML, &$fields) {
 296     $name = trim((string ) $fieldXML->name);
 297     $field = ['name' => $name, 'localizable' => ((bool) $fieldXML->localizable) ? 1 : 0];
 298     $type = (string ) $fieldXML->type;
 299     switch ($type) {
 300       case 'varchar':
 301       case 'char':
 302         $field['length'] = (int) $fieldXML->length;
 303         $field['sqlType'] = "$type({$field['length']})";
 304         $field['phpType'] = 'string';
 305         $field['crmType'] = 'CRM_Utils_Type::T_STRING';
 306         $field['size'] = $this->getSize($fieldXML);
 307         break;
 308
 309       case 'text':
 310         $field['sqlType'] = $field['phpType'] = $type;
 311         $field['crmType'] = 'CRM_Utils_Type::T_' . strtoupper($type);
 312         // CRM-13497 see fixme below
 313         $field['rows'] = isset($fieldXML->html) ? $this->value('rows', $fieldXML->html) : NULL;
 314         $field['cols'] = isset($fieldXML->html) ? $this->value('cols', $fieldXML->html) : NULL;
 315         break;
 316
 317       break;
 318
 319       case 'datetime':
 320         $field['sqlType'] = $field['phpType'] = $type;
 321         $field['crmType'] = 'CRM_Utils_Type::T_DATE + CRM_Utils_Type::T_TIME';
 322         break;
 323
 324       case 'boolean':
 325         // need this case since some versions of mysql do not have boolean as a valid column type and hence it
 326         // is changed to tinyint. hopefully after 2 yrs this case can be removed.
 327         $field['sqlType'] = 'tinyint';
 328         $field['phpType'] = 'bool';
 329         $field['crmType'] = 'CRM_Utils_Type::T_' . strtoupper($type);
 330         break;
 331
 332       case 'decimal':
 333         $length = $fieldXML->length ? $fieldXML->length : '20,2';
 334         $field['sqlType'] = 'decimal(' . $length . ')';
 335         $field['phpType'] = 'float';
 336         $field['crmType'] = 'CRM_Utils_Type::T_MONEY';
 337         $field['precision'] = $length . ',';
 338         break;
 339
 340       case 'float':
 341         $field['sqlType'] = 'double';
 342         $field['phpType'] = 'float';
 343         $field['crmType'] = 'CRM_Utils_Type::T_FLOAT';
 344         break;
 345
 346       default:
 347         $field['phpType'] = $this->value('phpType', $fieldXML, $type);
 348         $field['sqlType'] = $type;
 349         if ($type == 'int unsigned' || $type == 'tinyint') {
 350           $field['phpType'] = 'int';
 351           $field['crmType'] = 'CRM_Utils_Type::T_INT';
 352         }
 353         else {
 354           $field['crmType'] = $this->value('crmType', $fieldXML, 'CRM_Utils_Type::T_' . strtoupper($type));
 355         }
 356         break;
 357     }
 358
 359     $field['required'] = $this->value('required', $fieldXML);
 360     $field['collate'] = $this->value('collate', $fieldXML);
 361     $field['comment'] = $this->value('comment', $fieldXML);
 362     $field['default'] = $this->value('default', $fieldXML);
 363     $field['import'] = $this->value('import', $fieldXML);
 364     if ($this->value('export', $fieldXML)) {
 365       $field['export'] = $this->value('export', $fieldXML);
 366     }
 367     else {
 368       $field['export'] = $this->value('import', $fieldXML);
 369     }
 370     $field['rule'] = $this->value('rule', $fieldXML);
 371     $field['title'] = $this->value('title', $fieldXML);
 372     if (!$field['title']) {
 373       $field['title'] = $this->composeTitle($name);
 374     }
 375     $field['headerPattern'] = $this->value('headerPattern', $fieldXML);
 376     $field['dataPattern'] = $this->value('dataPattern', $fieldXML);
 377     $field['uniqueName'] = $this->value('uniqueName', $fieldXML);
 378     $field['uniqueTitle'] = $this->value('uniqueTitle', $fieldXML);
 379     $field['serialize'] = $this->value('serialize', $fieldXML);
 380     $field['html'] = $this->value('html', $fieldXML);
 381     $field['contactType'] = $this->value('contactType', $fieldXML);
 382     if (isset($fieldXML->permission)) {
 383       $field['permission'] = trim($this->value('permission', $fieldXML));
 384       $field['permission'] = $field['permission'] ? array_filter(array_map('trim', explode(',', $field['permission']))) : [];
 385       if (isset($fieldXML->permission->or)) {
 386         $field['permission'][] = array_filter(array_map('trim', explode(',', $fieldXML->permission->or)));
 387       }
 388     }
 389     if (!empty($field['html'])) {
 390       $validOptions = [
 391         'type',
 392         'formatType',
 393         'label',
 394         'controlField',
 395         /* Fixme: prior to CRM-13497 these were in a flat structure
 396         // CRM-13497 moved them to be nested within 'html' but there's no point
 397         // making that change in the DAOs right now since we are in the process of
 398         // moving to docrtine anyway.
 399         // So translating from nested xml back to flat structure for now.
 400         'rows',
 401         'cols',
 402         'size', */
 403       ];
 404       $field['html'] = [];
 405       foreach ($validOptions as $htmlOption) {
 406         if (!empty($fieldXML->html->$htmlOption)) {
 407           $field['html'][$htmlOption] = $this->value($htmlOption, $fieldXML->html);
 408         }
 409       }
 410     }
 411
 412     // in multilingual context popup, we need extra information to create appropriate widget
 413     if ($fieldXML->localizable) {
 414       if (isset($fieldXML->html)) {
 415         $field['widget'] = (array) $fieldXML->html;
 416       }
 417       else {
 418         // default
 419         $field['widget'] = ['type' => 'Text'];
 420       }
 421       if (isset($fieldXML->required)) {
 422         $field['widget']['required'] = $this->value('required', $fieldXML);
 423       }
 424     }
 425     if (isset($fieldXML->localize_context)) {
 426       $field['localize_context'] = $fieldXML->localize_context;
 427     }
 428     $field['add'] = $this->value('add', $fieldXML);
 429     $field['pseudoconstant'] = $this->value('pseudoconstant', $fieldXML);
 430     if (!empty($field['pseudoconstant'])) {
 431       //ok this is a bit long-winded but it gets there & is consistent with above approach
 432       $field['pseudoconstant'] = [];
 433       $validOptions = [
 434         // Fields can specify EITHER optionGroupName OR table, not both
 435         // (since declaring optionGroupName means we are using the civicrm_option_value table)
 436         'optionGroupName',
 437         'table',
 438         // If table is specified, keyColumn and labelColumn are also required
 439         'keyColumn',
 440         'labelColumn',
 441         // Non-translated machine name for programmatic lookup. Defaults to 'name' if that column exists
 442         'nameColumn',
 443         // Column to fetch in "abbreviate" context
 444         'abbrColumn',
 445         // Where clause snippet (will be joined to the rest of the query with AND operator)
 446         'condition',
 447         // callback function incase of static arrays
 448         'callback',
 449         // Path to options edit form
 450         'optionEditPath',
 451       ];
 452       foreach ($validOptions as $pseudoOption) {
 453         if (!empty($fieldXML->pseudoconstant->$pseudoOption)) {
 454           $field['pseudoconstant'][$pseudoOption] = $this->value($pseudoOption, $fieldXML->pseudoconstant);
 455         }
 456       }
 457       if (!isset($field['pseudoconstant']['optionEditPath']) && !empty($field['pseudoconstant']['optionGroupName'])) {
 458         $field['pseudoconstant']['optionEditPath'] = 'civicrm/admin/options/' . $field['pseudoconstant']['optionGroupName'];
 459       }
 460       // For now, fields that have option lists that are not in the db can simply
 461       // declare an empty pseudoconstant tag and we'll add this placeholder.
 462       // That field's BAO::buildOptions fn will need to be responsible for generating the option list
 463       if (empty($field['pseudoconstant'])) {
 464         $field['pseudoconstant'] = 'not in database';
 465       }
 466     }
 467     $fields[$name] = &$field;
 468   }
 469
 470   /**
 471    * @param string $name
 472    *
 473    * @return string
 474    */
 475   public function composeTitle($name) {
 476     $names = explode('_', strtolower($name));
 477     $title = '';
 478     for ($i = 0; $i < count($names); $i++) {
 479       if ($names[$i] === 'id' || $names[$i] === 'is') {
 480         // id's do not get titles
 481         return NULL;
 482       }
 483
 484       if ($names[$i] === 'im') {
 485         $names[$i] = 'IM';
 486       }
 487       else {
 488         $names[$i] = ucfirst(trim($names[$i]));
 489       }
 490
 491       $title = $title . ' ' . $names[$i];
 492     }
 493     return trim($title);
 494   }
 495
 496   /**
 497    * @param object $primaryXML
 498    * @param array $fields
 499    * @param array $table
 500    */
 501   public function getPrimaryKey(&$primaryXML, &$fields, &$table) {
 502     $name = trim((string ) $primaryXML->name);
 503
 504     // set the autoincrement property of the field
 505     $auto = $this->value('autoincrement', $primaryXML);
 506     if (isset($fields[$name])) {
 507       $fields[$name]['autoincrement'] = $auto;
 508     }
 509     $fields[$name]['autoincrement'] = $auto;
 510     $primaryKey = [
 511       'name' => $name,
 512       'autoincrement' => $auto,
 513     ];
 514
 515     // populate fields
 516     foreach ($primaryXML->fieldName as $v) {
 517       $fieldName = (string) ($v);
 518       $length = (string) ($v['length']);
 519       if (strlen($length) > 0) {
 520         $fieldName = "$fieldName($length)";
 521       }
 522       $primaryKey['field'][] = $fieldName;
 523     }
 524
 525     // when field array is empty set it to the name of the primary key.
 526     if (empty($primaryKey['field'])) {
 527       $primaryKey['field'][] = $name;
 528     }
 529
 530     // all fieldnames have to be defined and should exist in schema.
 531     foreach ($primaryKey['field'] as $fieldName) {
 532       if (!$fieldName) {
 533         echo "Invalid field defination for index $name\n";
 534         return;
 535       }
 536       $parenOffset = strpos($fieldName, '(');
 537       if ($parenOffset > 0) {
 538         $fieldName = substr($fieldName, 0, $parenOffset);
 539       }
 540       if (!array_key_exists($fieldName, $fields)) {
 541         echo "Table does not contain $fieldName\n";
 542         print_r($fields);
 543         exit();
 544       }
 545     }
 546
 547     $table['primaryKey'] = &$primaryKey;
 548   }
 549
 550   /**
 551    * @param $indexXML
 552    * @param $fields
 553    * @param $indices
 554    */
 555   public function getIndex(&$indexXML, &$fields, &$indices) {
 556     //echo "\n\n*******************************************************\n";
 557     //echo "entering getIndex\n";
 558
 559     $index = [];
 560     // empty index name is fine
 561     $indexName = trim((string) $indexXML->name);
 562     $index['name'] = $indexName;
 563     $index['field'] = [];
 564
 565     // populate fields
 566     foreach ($indexXML->fieldName as $v) {
 567       $fieldName = (string) ($v);
 568       $length = (string) ($v['length']);
 569       if (strlen($length) > 0) {
 570         $fieldName = "$fieldName($length)";
 571       }
 572       $index['field'][] = $fieldName;
 573     }
 574
 575     $index['localizable'] = FALSE;
 576     foreach ($index['field'] as $fieldName) {
 577       if (isset($fields[$fieldName]) and $fields[$fieldName]['localizable']) {
 578         $index['localizable'] = TRUE;
 579         break;
 580       }
 581     }
 582
 583     // check for unique index
 584     if ($this->value('unique', $indexXML)) {
 585       $index['unique'] = TRUE;
 586     }
 587
 588     // field array cannot be empty
 589     if (empty($index['field'])) {
 590       echo "No fields defined for index $indexName\n";
 591       return;
 592     }
 593
 594     // all fieldnames have to be defined and should exist in schema.
 595     foreach ($index['field'] as $fieldName) {
 596       if (!$fieldName) {
 597         echo "Invalid field defination for index $indexName\n";
 598         return;
 599       }
 600       $parenOffset = strpos($fieldName, '(');
 601       if ($parenOffset > 0) {
 602         $fieldName = substr($fieldName, 0, $parenOffset);
 603       }
 604       if (!array_key_exists($fieldName, $fields)) {
 605         echo "Table does not contain $fieldName\n";
 606         print_r($fields);
 607         exit();
 608       }
 609     }
 610     $indices[$indexName] = &$index;
 611   }
 612
 613   /**
 614    * @param $foreignXML
 615    * @param $fields
 616    * @param $foreignKeys
 617    * @param string $currentTableName
 618    */
 619   public function getForeignKey(&$foreignXML, &$fields, &$foreignKeys, &$currentTableName) {
 620     $name = trim((string ) $foreignXML->name);
 621
 622     /** need to make sure there is a field of type name */
 623     if (!array_key_exists($name, $fields)) {
 624       echo "foreign $name in $currentTableName does not have a field definition, ignoring\n";
 625       return;
 626     }
 627
 628     /** need to check for existence of table and key **/
 629     $table = trim($this->value('table', $foreignXML));
 630     $foreignKey = [
 631       'name' => $name,
 632       'table' => $table,
 633       'uniqName' => "FK_{$currentTableName}_{$name}",
 634       'key' => trim($this->value('key', $foreignXML)),
 635       'import' => $this->value('import', $foreignXML, FALSE),
 636       'export' => $this->value('import', $foreignXML, FALSE),
 637       // we do this matching in a separate phase (resolveForeignKeys)
 638       'className' => NULL,
 639       'onDelete' => $this->value('onDelete', $foreignXML, FALSE),
 640     ];
 641     $foreignKeys[$name] = &$foreignKey;
 642   }
 643
 644   /**
 645    * @param $foreignXML
 646    * @param $dynamicForeignKeys
 647    */
 648   public function getDynamicForeignKey(&$foreignXML, &$dynamicForeignKeys) {
 649     $foreignKey = [
 650       'idColumn' => trim($foreignXML->idColumn),
 651       'typeColumn' => trim($foreignXML->typeColumn),
 652       'key' => trim($this->value('key', $foreignXML)),
 653     ];
 654     $dynamicForeignKeys[] = $foreignKey;
 655   }
 656
 657   /**
 658    * @param $key
 659    * @param $object
 660    * @param null $default
 661    *
 662    * @return null|string
 663    */
 664   protected function value($key, &$object, $default = NULL) {
 665     if (isset($object->$key)) {
 666       return (string ) $object->$key;
 667     }
 668     return $default;
 669   }
 670
 671   /**
 672    * @param $attributes
 673    * @param $object
 674    * @param string $name
 675    * @param null $pre
 676    * @param null $post
 677    */
 678   protected function checkAndAppend(&$attributes, &$object, $name, $pre = NULL, $post = NULL) {
 679     if (!isset($object->$name)) {
 680       return;
 681     }
 682
 683     $value = $pre . trim($object->$name) . $post;
 684     $this->append($attributes, ' ', trim($value));
 685   }
 686
 687   /**
 688    * @param $str
 689    * @param $delim
 690    * @param $name
 691    */
 692   protected function append(&$str, $delim, $name) {
 693     if (empty($name)) {
 694       return;
 695     }
 696
 697     if (is_array($name)) {
 698       foreach ($name as $n) {
 699         if (empty($n)) {
 700           continue;
 701         }
 702         if (empty($str)) {
 703           $str = $n;
 704         }
 705         else {
 706           $str .= $delim . $n;
 707         }
 708       }
 709     }
 710     else {
 711       if (empty($str)) {
 712         $str = $name;
 713       }
 714       else {
 715         $str .= $delim . $name;
 716       }
 717     }
 718   }
 719
 720   /**
 721    * Sets the size property of a textfield.
 722    *
 723    * @param string $fieldXML
 724    *
 725    * @return null|string
 726    */
 727   protected function getSize($fieldXML) {
 728     // Extract from <size> tag if supplied
 729     if (!empty($fieldXML->html) && $this->value('size', $fieldXML->html)) {
 730       return $this->value('size', $fieldXML->html);
 731     }
 732     // Infer from <length> tag if <size> was not explicitly set or was invalid
 733     // This map is slightly different from CRM_Core_Form_Renderer::$_sizeMapper
 734     // Because we usually want fields to render as smaller than their maxlength
 735     $sizes = [
 736       2 => 'TWO',
 737       4 => 'FOUR',
 738       6 => 'SIX',
 739       8 => 'EIGHT',
 740       16 => 'TWELVE',
 741       32 => 'MEDIUM',
 742       64 => 'BIG',
 743     ];
 744     foreach ($sizes as $length => $name) {
 745       if ($fieldXML->length <= $length) {
 746         return "CRM_Utils_Type::$name";
 747       }
 748     }
 749     return 'CRM_Utils_Type::HUGE';
 750   }
 751
 752 }