Mozilla/mozilla/htmlparser/src/nsHTMLEntities.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The Original Code is Mozilla Communicator client code.
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#include "nsHTMLEntities.h"



#include "nsString.h"
#include "nsCRT.h"
#include "prtypes.h"
#include "pldhash.h"

struct EntityNode {
  const char* mStr; // never owns buffer
  PRInt32       mUnicode;
};

struct EntityNodeEntry : public PLDHashEntryHdr
{
  const EntityNode* node;
}; 

PR_STATIC_CALLBACK(const void*)
  getStringKey(PLDHashTable*, PLDHashEntryHdr* aHdr)
{
  const EntityNodeEntry* entry = NS_STATIC_CAST(const EntityNodeEntry*, aHdr);
  return entry->node->mStr;
}

PR_STATIC_CALLBACK(const void*)
  getUnicodeKey(PLDHashTable*, PLDHashEntryHdr* aHdr)
{
  const EntityNodeEntry* entry = NS_STATIC_CAST(const EntityNodeEntry*, aHdr);
  return NS_INT32_TO_PTR(entry->node->mUnicode);
}

PR_STATIC_CALLBACK(PRBool)
  matchNodeString(PLDHashTable*, const PLDHashEntryHdr* aHdr,
                  const void* key)
{
  const EntityNodeEntry* entry = NS_STATIC_CAST(const EntityNodeEntry*, aHdr);
  const char* str = NS_STATIC_CAST(const char*, key);
  return (nsCRT::strcmp(entry->node->mStr, str) == 0);
}

PR_STATIC_CALLBACK(PRBool)
  matchNodeUnicode(PLDHashTable*, const PLDHashEntryHdr* aHdr,
                   const void* key)
{
  const EntityNodeEntry* entry = NS_STATIC_CAST(const EntityNodeEntry*, aHdr);
  const PRInt32 ucode = NS_PTR_TO_INT32(key);
  return (entry->node->mUnicode == ucode);
}

PR_STATIC_CALLBACK(PLDHashNumber)
  hashUnicodeValue(PLDHashTable*, const void* key)
{
  // key is actually the unicode value
  return PLDHashNumber(key);
  }


static const PLDHashTableOps EntityToUnicodeOps = {
  PL_DHashAllocTable,
  PL_DHashFreeTable,
  getStringKey,
  PL_DHashStringKey,
  matchNodeString,
  PL_DHashMoveEntryStub,
  PL_DHashClearEntryStub,
  PL_DHashFinalizeStub,
  nsnull,
}; 

static const PLDHashTableOps UnicodeToEntityOps = {
  PL_DHashAllocTable,
  PL_DHashFreeTable,
  getUnicodeKey,
  hashUnicodeValue,
  matchNodeUnicode,
  PL_DHashMoveEntryStub,
  PL_DHashClearEntryStub,
  PL_DHashFinalizeStub,
  nsnull,
};

PLDHashTable gEntityToUnicode = { 0 };
PLDHashTable gUnicodeToEntity = { 0 };

#define HTML_ENTITY(_name, _value) { #_name, _value },
static const EntityNode gEntityArray[] = {
#include "nsHTMLEntityList.h"
};
#undef HTML_ENTITY

#define NS_HTML_ENTITY_COUNT ((PRInt32)(sizeof(gEntityArray) / sizeof(gEntityArray[0])))

void
nsHTMLEntities::AddRefTable(void) 
{
  if (!gEntityToUnicode.ops)
    PL_DHashTableInit(&gEntityToUnicode, &EntityToUnicodeOps,
                      nsnull, sizeof(EntityNodeEntry), NS_HTML_ENTITY_COUNT);
                         
  if (!gUnicodeToEntity.ops)
    PL_DHashTableInit(&gUnicodeToEntity, &UnicodeToEntityOps,
                      nsnull, sizeof(EntityNodeEntry), NS_HTML_ENTITY_COUNT);

  PRUint32 i;
  for (i=0; i<NS_HTML_ENTITY_COUNT; i++) {
    EntityNodeEntry* entry;

    // add to Entity->Unicode table
    entry = NS_STATIC_CAST(EntityNodeEntry*,
                           PL_DHashTableOperate(&gEntityToUnicode,
                                                gEntityArray[i].mStr,
                                                PL_DHASH_ADD));
    NS_ASSERTION(entry, "Error adding an entry");
    entry->node = &gEntityArray[i];

    // add to Unicode->Entity table
    entry = NS_STATIC_CAST(EntityNodeEntry*,
                           PL_DHashTableOperate(&gUnicodeToEntity,
                                                NS_INT32_TO_PTR(gEntityArray[i].mUnicode),
                                                PL_DHASH_ADD));
    NS_ASSERTION(entry, "Error adding an entry");
    entry->node = &gEntityArray[i];

  }
    
}

void
nsHTMLEntities::ReleaseTable(void) 
{
  if (gEntityToUnicode.ops) {
    PL_DHashTableFinish(&gEntityToUnicode);
    gEntityToUnicode.ops = nsnull;
  }
  if (gUnicodeToEntity.ops) {
    PL_DHashTableFinish(&gUnicodeToEntity);
    gUnicodeToEntity.ops = nsnull;
  }

}

PRInt32 
nsHTMLEntities::EntityToUnicode(const nsCString& aEntity)
{
  NS_ASSERTION(gEntityToUnicode.ops, "no lookup table, needs addref");
  if (!gEntityToUnicode.ops)
    return -1;

    //this little piece of code exists because entities may or may not have the terminating ';'.
    //if we see it, strip if off for this test...

    if(';'==aEntity.Last()) {
      nsCAutoString temp(aEntity);
      temp.Truncate(aEntity.Length()-1);
      return EntityToUnicode(temp);
    }
      
  EntityNodeEntry* entry = 
    NS_STATIC_CAST(EntityNodeEntry*,
                   PL_DHashTableOperate(&gEntityToUnicode, aEntity.get(), PL_DHASH_LOOKUP));

  if (!entry || PL_DHASH_ENTRY_IS_FREE(entry))
  return -1;
        
  return entry->node->mUnicode;
}


PRInt32 
nsHTMLEntities::EntityToUnicode(const nsAString& aEntity) {
  nsCAutoString theEntity; theEntity.AssignWithConversion(aEntity);
  if(';'==theEntity.Last()) {
    theEntity.Truncate(theEntity.Length()-1);
  }

  return EntityToUnicode(theEntity);
}


const char*
nsHTMLEntities::UnicodeToEntity(PRInt32 aUnicode)
{
  NS_ASSERTION(gUnicodeToEntity.ops, "no lookup table, needs addref");
  EntityNodeEntry* entry =
    NS_STATIC_CAST(EntityNodeEntry*,
                   PL_DHashTableOperate(&gUnicodeToEntity, NS_INT32_TO_PTR(aUnicode), PL_DHASH_LOOKUP));
                   
  if (!entry || PL_DHASH_ENTRY_IS_FREE(entry))
  return nsnull;
    
  return entry->node->mStr;
}

#ifdef NS_DEBUG
#include <stdio.h>

class nsTestEntityTable {
public:
   nsTestEntityTable() {
     PRInt32 value;
     nsHTMLEntities::AddRefTable();

     // Make sure we can find everything we are supposed to
     for (int i = 0; i < NS_HTML_ENTITY_COUNT; ++i) {
       nsAutoString entity; entity.AssignWithConversion(gEntityArray[i].mStr);

       value = nsHTMLEntities::EntityToUnicode(entity);
       NS_ASSERTION(value != -1, "can't find entity");
       NS_ASSERTION(value == gEntityArray[i].mUnicode, "bad unicode value");

       entity.AssignWithConversion(nsHTMLEntities::UnicodeToEntity(value));
       NS_ASSERTION(entity.EqualsWithConversion(gEntityArray[i].mStr), "bad entity name");
     }

     // Make sure we don't find things that aren't there
     value = nsHTMLEntities::EntityToUnicode(nsCAutoString("@"));
     NS_ASSERTION(value == -1, "found @");
     value = nsHTMLEntities::EntityToUnicode(nsCAutoString("zzzzz"));
     NS_ASSERTION(value == -1, "found zzzzz");
     nsHTMLEntities::ReleaseTable();
   }
};
//nsTestEntityTable validateEntityTable;
#endif