Scripts/Spell: extend SpellScript class: add target aura accessors and functions which prevent various effects of the spell from being executed. Check out SpellScript.h for details

--HG--
branch : trunk

src/server/game/Entities/Unit/Unit.cpp

@@ -1578,7 +1578,7 @@ bool Unit::IsDamageReducedByArmor(SpellSchoolMask schoolMask, SpellEntry const *
 
         // bleeding effects are not reduced by armor
         if (effIndex != MAX_SPELL_EFFECTS && spellInfo->EffectApplyAuraName[effIndex] == SPELL_AURA_PERIODIC_DAMAGE)
-            if (GetSpellMechanicMask(spellInfo, effIndex) & MECHANIC_BLEED)
+            if (GetSpellMechanicMask(spellInfo, effIndex) & (1<<MECHANIC_BLEED))
                 return false;
     }
     return true;

src/server/game/Spells/Spell.cpp

@@ -1404,6 +1404,8 @@ SpellMissInfo Spell::DoSpellHitOnUnit(Unit *unit, const uint32 effectMask, bool
     if (m_spellInfo->speed && (unit->IsImmunedToDamage(m_spellInfo) || unit->IsImmunedToSpell(m_spellInfo)))
         return SPELL_MISS_IMMUNE;
 
+    PrepareTargetHitForScripts();
+
     if (unit->GetTypeId() == TYPEID_PLAYER)
     {
         unit->ToPlayer()->GetAchievementMgr().StartTimedAchievement(ACHIEVEMENT_TIMED_TYPE_SPELL_TARGET, m_spellInfo->Id);
@@ -1639,6 +1641,8 @@ void Spell::DoAllEffectOnTarget(GOTargetInfo *target)
     if (!go)
         return;
 
+    PrepareTargetHitForScripts();
+
     for (uint32 effectNumber = 0; effectNumber < 3; ++effectNumber)
         if (effectMask & (1 << effectNumber))
             HandleEffects(NULL, NULL, go, effectNumber);
@@ -1658,6 +1662,8 @@ void Spell::DoAllEffectOnTarget(ItemTargetInfo *target)
     if (!target->item || !effectMask)
         return;
 
+    PrepareTargetHitForScripts();
+
     for (uint32 effectNumber = 0; effectNumber < 3; ++effectNumber)
         if (effectMask & (1 << effectNumber))
             HandleEffects(NULL, target->item, NULL, effectNumber);
@@ -3255,6 +3261,8 @@ void Spell::cast(bool skipCheck)
     // CAST SPELL
     SendSpellCooldown();
 
+    PrepareTargetHitForScripts();
+
     for (uint32 i = 0; i < 3; ++i)
     {
         switch(m_spellInfo->Effect[i])
@@ -3419,6 +3427,8 @@ void Spell::_handle_immediate_phase()
     // handle some immediate features of the spell here
     HandleThreatSpells(m_spellInfo->Id);
 
+    PrepareTargetHitForScripts();
+
     m_needSpellLog = IsNeedSendToClient();
     for (uint32 j = 0; j < 3; ++j)
     {
@@ -4667,17 +4677,22 @@ void Spell::HandleEffects(Unit *pUnitTarget,Item *pItemTarget,GameObject *pGOTar
     //we do not need DamageMultiplier here.
     damage = CalculateDamage(i, NULL);
 
+    // execute script effect handler hooks and check if effects was prevented
+    bool preventDefault = false;
     for(std::list<SpellScript *>::iterator scritr = m_loadedScripts.begin(); scritr != m_loadedScripts.end() ; ++scritr)
     {
         std::list<SpellScript::EffectHandler>::iterator effEndItr = (*scritr)->EffectHandlers.end(), effItr = (*scritr)->EffectHandlers.begin();
         for(; effItr != effEndItr ; ++effItr)
         {
-            if ((*effItr).IsEffectAffected(m_spellInfo, i))
+            // effect execution can be prevented
+            if (!(*scritr)->_IsEffectPrevented((SpellEffIndex)i) && (*effItr).IsEffectAffected(m_spellInfo, i))
                 (*effItr).Call(*scritr, (SpellEffIndex)i);
         }
+        if (!preventDefault)
+            preventDefault = (*scritr)->_IsDefaultEffectPrevented((SpellEffIndex)i);
     }
 
-    if (eff < TOTAL_SPELL_EFFECTS)
+    if (!preventDefault && eff < TOTAL_SPELL_EFFECTS)
     {
         (this->*SpellEffects[eff])(i);
     }
@@ -7290,3 +7305,11 @@ void Spell::LoadScripts()
         ++itr;
     }
 }
+
+void Spell::PrepareTargetHitForScripts()
+{
+    for(std::list<SpellScript *>::iterator scritr = m_loadedScripts.begin(); scritr != m_loadedScripts.end() ; ++scritr)
+    {
+        (*scritr)->_InitHit();
+    }
+}

src/server/game/Spells/Spell.h

@@ -672,6 +672,7 @@ class Spell
 
         // Scripting system
         void LoadScripts();
+        void PrepareTargetHitForScripts();
         std::list<SpellScript *> m_loadedScripts;
 
         // effect helpers

src/server/game/Spells/SpellMgr.cpp

@@ -3856,15 +3856,16 @@ void SpellMgr::LoadSpellCustomAttr()
         case 18500: // Wing Buffet
         case 33086: // Wild Bite
         case 49749: // Piercing Blow
+        case 52890: // Penetrating Strike
         case 53454: // Impale
         case 59446: // Impale
         case 62383: // Shatter
         case 64777: // Machine Gun
         case 65239: // Machine Gun
-        case 65919: // Pursuing Spikes
-        case 67858: // Pursuing Spikes
-        case 67859: // Pursuing Spikes
-        case 67860: // Pursuing Spikes
+        case 65919: // Impale
+        case 67858: // Impale
+        case 67859: // Impale
+        case 67860: // Impale
         case 69293: // Wing Buffet
         case 74439: // Machine Gun
             mSpellCustomAttr[i] |= SPELL_ATTR_CU_IGNORE_ARMOR;

src/server/game/Spells/SpellScript.cpp

@@ -19,6 +19,7 @@
 #include <string>
 #include "SpellScript.h"
 #include "Spell.h"
+#include "SpellAuras.h"
 
 bool _SpellScript::_Validate(SpellEntry const * entry, const char * scriptname)
 {
@@ -164,6 +165,12 @@ bool SpellScript::_Load(Spell * spell)
     return Load();
 }
 
+void SpellScript::_InitHit()
+{
+    m_hitPreventEffectMask = 0;
+    m_hitPreventDefaultEffectMask = 0;
+}
+
 Unit * SpellScript::GetCaster()
 {
      return m_spell->GetCaster();
@@ -237,6 +244,32 @@ void SpellScript::SetHitHeal(int32 heal)
     m_spell->m_healing = heal;
 }
 
+Aura* SpellScript::GetHitAura()
+{
+    if (!m_spell->m_spellAura)
+        return NULL;
+    if (m_spell->m_spellAura->IsRemoved())
+        return NULL;
+    return m_spell->m_spellAura;
+}
+
+void SpellScript::PreventHitAura()
+{
+    if (m_spell->m_spellAura)
+        m_spell->m_spellAura->Remove();
+}
+
+void SpellScript::PreventHitEffect(SpellEffIndex effIndex)
+{
+    m_hitPreventEffectMask |= 1 << effIndex;
+    PreventHitDefaultEffect(effIndex);
+}
+
+void SpellScript::PreventHitDefaultEffect(SpellEffIndex effIndex)
+{
+    m_hitPreventDefaultEffectMask |= 1 << effIndex;
+}
+
 int32 SpellScript::GetEffectValue()
 {
     return m_spell->damage;

src/server/game/Spells/SpellScript.h

@@ -26,6 +26,7 @@ class Unit;
 struct SpellEntry;
 class SpellScript;
 class Spell;
+class Aura;
 class Creature;
 class GameObject;
 class Player;
@@ -110,8 +111,13 @@ class SpellScript : public _SpellScript
     public:
         bool _Validate(SpellEntry const * entry, const char * scriptname);
         bool _Load(Spell * spell);
+        void _InitHit();
+        bool _IsEffectPrevented(SpellEffIndex effIndex) {return m_hitPreventEffectMask & (1<<effIndex);};
+        bool _IsDefaultEffectPrevented(SpellEffIndex effIndex) {return m_hitPreventDefaultEffectMask & (1<<effIndex);};
     private:
         Spell * m_spell;
+        uint8 m_hitPreventEffectMask;
+        uint8 m_hitPreventDefaultEffectMask;
     public:
         //
         // SpellScript interface
@@ -149,9 +155,27 @@ class SpellScript : public _SpellScript
         // setter/getter for for damage done by spell to target of spell hit
         int32 GetHitDamage();
         void SetHitDamage(int32 damage);
+        void PreventHitDamage() { SetHitDamage(0); };
         // setter/getter for for heal done by spell to target of spell hit
         int32 GetHitHeal();
         void SetHitHeal(int32 heal);
+        void PreventHitHeal() { SetHitHeal(0); };
+
+        // returns current spell hit target aura
+        Aura * GetHitAura();
+        // prevents applying aura on current spell hit target
+        void PreventHitAura();
+
+        // prevents effect execution on current spell hit target
+        // including other effect/hit scripts
+        // will not work on aura/damage/heal
+        // will not work if effects were already handled
+        void PreventHitEffect(SpellEffIndex effIndex);
+
+        // prevents default effect execution on current spell hit target
+        // will not work on aura/damage/heal effects
+        // will not work if effects were already handled
+        void PreventHitDefaultEffect(SpellEffIndex effIndex);
 
         // method avalible only in EffectHandler method
         int32 GetEffectValue();