public function MigrateXMLReader::__construct in Migrate 6.2

Same name and namespace in other branches

1. 7.2 plugins/sources/xml.inc \MigrateXMLReader::__construct()

Prepares our extensions to the XMLReader object.

Parameters

$xml_url: URL of the XML file to be parsed.

$element_query: Query string in a restricted xpath format, for selecting elements to be returned by the interator. Supported syntax:

• The full path to the element must be specified; i.e., /file/article rather than //article.
• The elements may be filtered by attribute value by appending [@attribute="value"].

$id_query: Query string to the unique identifier for an element, relative to the root of that element. This supports the full xpath syntax.

File

plugins/sources/xml.inc, line 682

Support for migration from XML sources.

Class

MigrateXMLReader

Makes an XMLReader object iterable, returning elements matching a restricted xpath-like syntax.

Code

public function __construct($xml_url, $element_query, $id_query) {
  $this->reader = new XMLReader();
  $this->url = $xml_url;
  $this->elementQuery = $element_query;
  $this->idQuery = $id_query;

  // Suppress errors during parsing, so we can pick them up after
  libxml_use_internal_errors(TRUE);

  // Parse the element query. First capture group is the element path, second
  // (if present) is the attribute.
  preg_match_all('|^/([^\\[]+)(.*)$|', $element_query, $matches);
  $element_path = $matches[1][0];
  $this->elementsToMatch = explode('/', $element_path);
  $attribute_query = $matches[2][0];
  if ($attribute_query) {

    // Matches [@attribute="value"] (with either single- or double-quotes).
    preg_match_all('|^\\[@([^=]+)=[\'"](.*)[\'"]\\]$|', $attribute_query, $matches);
    $this->attributeName = $matches[1][0];
    $this->attributeValue = $matches[2][0];
  }
}