parser/htmlparser/src/nsParserService.cpp

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  38
  39 #include "nsDOMError.h"
  40 #include "nsIAtom.h"
  41 #include "nsParserService.h"
  42 #include "nsHTMLEntities.h"
  43 #include "nsElementTable.h"
  44 #include "nsICategoryManager.h"
  45 #include "nsCategoryManagerUtils.h"
  46
  47 extern "C" int MOZ_XMLCheckQName(const char* ptr, const char* end,
  48                                  int ns_aware, const char** colon);
  49
  50 nsParserService::nsParserService() : mEntries(0)
  51 {
  52   mHaveNotifiedCategoryObservers = PR_FALSE;
  53 }
  54
  55 nsParserService::~nsParserService()
  56 {
  57   nsObserverEntry *entry = nsnull;
  58   while( (entry = static_cast<nsObserverEntry*>(mEntries.Pop())) ) {
  59     NS_RELEASE(entry);
  60   }
  61 }
  62
  63 NS_IMPL_ISUPPORTS1(nsParserService, nsIParserService)
  64
  65 PRInt32
  66 nsParserService::HTMLAtomTagToId(nsIAtom* aAtom) const
  67 {
  68   nsAutoString tagName;
  69   aAtom->ToString(tagName);
  70
  71   return nsHTMLTags::LookupTag(tagName);
  72 }
  73
  74 PRInt32
  75 nsParserService::HTMLCaseSensitiveAtomTagToId(nsIAtom* aAtom) const
  76 {
  77   return nsHTMLTags::CaseSensitiveLookupTag(aAtom);
  78 }
  79
  80 PRInt32
  81 nsParserService::HTMLStringTagToId(const nsAString& aTag) const
  82 {
  83   return nsHTMLTags::LookupTag(aTag);
  84 }
  85
  86 const PRUnichar*
  87 nsParserService::HTMLIdToStringTag(PRInt32 aId) const
  88 {
  89   return nsHTMLTags::GetStringValue((nsHTMLTag)aId);
  90 }
  91
  92 nsIAtom*
  93 nsParserService::HTMLIdToAtomTag(PRInt32 aId) const
  94 {
  95   return nsHTMLTags::GetAtom((nsHTMLTag)aId);
  96 }
  97
  98 NS_IMETHODIMP
  99 nsParserService::HTMLConvertEntityToUnicode(const nsAString& aEntity,
 100                                             PRInt32* aUnicode) const
 101 {
 102   *aUnicode = nsHTMLEntities::EntityToUnicode(aEntity);
 103
 104   return NS_OK;
 105 }
 106
 107 NS_IMETHODIMP
 108 nsParserService::HTMLConvertUnicodeToEntity(PRInt32 aUnicode,
 109                                             nsCString& aEntity) const
 110 {
 111   const char* str = nsHTMLEntities::UnicodeToEntity(aUnicode);
 112   if (str) {
 113     aEntity.Assign(str);
 114   }
 115
 116   return NS_OK;
 117 }
 118
 119 NS_IMETHODIMP
 120 nsParserService::IsContainer(PRInt32 aId, PRBool& aIsContainer) const
 121 {
 122   aIsContainer = nsHTMLElement::IsContainer((eHTMLTags)aId);
 123
 124   return NS_OK;
 125 }
 126
 127 NS_IMETHODIMP
 128 nsParserService::IsBlock(PRInt32 aId, PRBool& aIsBlock) const
 129 {
 130   if((aId>eHTMLTag_unknown) && (aId<eHTMLTag_userdefined)) {
 131     aIsBlock=((gHTMLElements[aId].IsMemberOf(kBlock))       ||
 132               (gHTMLElements[aId].IsMemberOf(kBlockEntity)) ||
 133               (gHTMLElements[aId].IsMemberOf(kHeading))     ||
 134               (gHTMLElements[aId].IsMemberOf(kPreformatted))||
 135               (gHTMLElements[aId].IsMemberOf(kList)));
 136   }
 137   else {
 138     aIsBlock = PR_FALSE;
 139   }
 140
 141   return NS_OK;
 142 }
 143
 144 NS_IMETHODIMP
 145 nsParserService::RegisterObserver(nsIElementObserver* aObserver,
 146                                   const nsAString& aTopic,
 147                                   const eHTMLTags* aTags)
 148 {
 149   nsresult result = NS_OK;
 150   nsObserverEntry* entry = GetEntry(aTopic);
 151
 152   if(!entry) {
 153     result = CreateEntry(aTopic,&entry);
 154     NS_ENSURE_SUCCESS(result,result);
 155   }
 156
 157   while (*aTags) {
 158     if (*aTags <= NS_HTML_TAG_MAX) {
 159       entry->AddObserver(aObserver,*aTags);
 160     }
 161     ++aTags;
 162   }
 163
 164   return result;
 165 }
 166
 167 NS_IMETHODIMP
 168 nsParserService::UnregisterObserver(nsIElementObserver* aObserver,
 169                                     const nsAString& aTopic)
 170 {
 171   PRInt32 count = mEntries.GetSize();
 172
 173   for (PRInt32 i=0; i < count; ++i) {
 174     nsObserverEntry* entry = static_cast<nsObserverEntry*>(mEntries.ObjectAt(i));
 175     if (entry && entry->Matches(aTopic)) {
 176       entry->RemoveObserver(aObserver);
 177     }
 178   }
 179
 180   return NS_OK;
 181 }
 182
 183 NS_IMETHODIMP
 184 nsParserService::GetTopicObservers(const nsAString& aTopic,
 185                                    nsIObserverEntry** aEntry) {
 186   nsresult result = NS_OK;
 187   nsObserverEntry* entry = GetEntry(aTopic);
 188
 189   if (!entry) {
 190     return NS_ERROR_NULL_POINTER;
 191   }
 192
 193   NS_ADDREF(*aEntry = entry);
 194
 195   return result;
 196 }
 197
 198 nsresult
 199 nsParserService::CheckQName(const nsAString& aQName,
 200                             PRBool aNamespaceAware,
 201                             const PRUnichar** aColon)
 202 {
 203   const char* colon;
 204   const PRUnichar *begin, *end;
 205   begin = aQName.BeginReading();
 206   end = aQName.EndReading();
 207   int result = MOZ_XMLCheckQName(reinterpret_cast<const char*>(begin),
 208                                  reinterpret_cast<const char*>(end),
 209                                  aNamespaceAware, &colon);
 210   *aColon = reinterpret_cast<const PRUnichar*>(colon);
 211
 212   if (result == 0) {
 213     return NS_OK;
 214   }
 215
 216   // MOZ_EXPAT_EMPTY_QNAME || MOZ_EXPAT_INVALID_CHARACTER
 217   if (result == (1 << 0) || result == (1 << 1)) {
 218     return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
 219   }
 220
 221   return NS_ERROR_DOM_NAMESPACE_ERR;
 222 }
 223
 224 class nsMatchesTopic : public nsDequeFunctor{
 225   const nsAString& mString;
 226 public:
 227   PRBool matched;
 228   nsObserverEntry* entry;
 229   nsMatchesTopic(const nsAString& aString):mString(aString),matched(PR_FALSE){}
 230   virtual void* operator()(void* anObject){
 231     entry=static_cast<nsObserverEntry*>(anObject);
 232     matched=mString.Equals(entry->mTopic);
 233     return matched ? nsnull : anObject;
 234   }
 235 };
 236
 237 // XXX This may be more efficient as a HashTable instead of linear search
 238 nsObserverEntry*
 239 nsParserService::GetEntry(const nsAString& aTopic)
 240 {
 241   if (!mHaveNotifiedCategoryObservers) {
 242     mHaveNotifiedCategoryObservers = PR_TRUE;
 243     NS_CreateServicesFromCategory("parser-service-category",
 244                                   static_cast<nsISupports*>(static_cast<void*>(this)),
 245                                   "parser-service-start");
 246   }
 247
 248   nsMatchesTopic matchesTopic(aTopic);
 249   mEntries.FirstThat(*&matchesTopic);
 250   return matchesTopic.matched?matchesTopic.entry:nsnull;
 251 }
 252
 253 nsresult
 254 nsParserService::CreateEntry(const nsAString& aTopic, nsObserverEntry** aEntry)
 255 {
 256   *aEntry = new nsObserverEntry(aTopic);
 257
 258   if (!*aEntry) {
 259     return NS_ERROR_OUT_OF_MEMORY;
 260   }
 261
 262   NS_ADDREF(*aEntry);
 263   mEntries.Push(*aEntry);
 264
 265   return NS_OK;
 266 }