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nsImageMapUtils.cpp

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#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsCOMPtr.h"
#include "nsIDocument.h"
#include "nsIHTMLDocument.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNode.h"
#include "nsIDOMElement.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsImageMapUtils.h"

/*static*/
already_AddRefed<nsIDOMHTMLMapElement>
nsImageMapUtils::FindImageMap(nsIDocument *aDocument, 
                                                    const nsAString &aUsemap)
{
  if (!aDocument)
    return nsnull;

  // We used to strip the whitespace from the usemap value as a Quirk,
  // but it was too quirky and didn't really work correctly - see bug
  // 87050

  if (aUsemap.IsEmpty())
    return nsnull;

  nsAString::const_iterator start, end;
  aUsemap.BeginReading(start);
  aUsemap.EndReading(end);

  PRInt32 hash = aUsemap.FindChar('#');
  if (hash > -1) {
    // aUsemap contains a '#', set start to point right after the '#'
    start.advance(hash + 1);

    if (start == end) {
      return nsnull; // aUsemap == "#"
    }
  } else {
    return nsnull;
  }

  const nsAString& usemap = Substring(start, end);

  nsCOMPtr<nsIHTMLDocument> htmlDoc(do_QueryInterface(aDocument));
  if (htmlDoc) {
    nsIDOMHTMLMapElement* map = htmlDoc->GetImageMap(usemap);
    NS_IF_ADDREF(map);
    return map;
  } else {
    // For XHTML elements embedded in non-XHTML documents we get the
    // map by id since XHTML requires that where a "name" attribute
    // was used in HTML 4.01, the "id" attribute must be used in
    // XHTML. The attribute "name" is officially deprecated.  This
    // simplifies our life becase we can simply get the map with
    // getElementById().
    nsCOMPtr<nsIDOMDocument> domDoc(do_QueryInterface(aDocument));
    if (domDoc) {
      nsCOMPtr<nsIDOMElement> element;
      domDoc->GetElementById(usemap, getter_AddRefs(element));

      if (element) {
        nsIDOMHTMLMapElement* map;
        CallQueryInterface(element, &map);
        return map;
      }
    }
  }
  
  return nsnull;
}

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