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flygard-core/.agents/docs/cpp-scripts.md

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C++ scripts

Scripts inherit from a ScriptObject subclass (SpellScript, AuraScript, CreatureScript, InstanceMapScript, GameObjectScript, CommandScript, …). Two registration styles coexist:

  • Spell / aura scripts: RegisterSpellScript(ClassName) (or RegisterSpellAndAuraScriptPair(...)) inside AddSC_<name>().
  • Creature scripts: prefer RegisterCreatureAI(ClassName) for new code; legacy zones still use new ClassName();. Match the surrounding pattern.

Then declare and call AddSC_<name>() from the regional loader (Spells/spells_script_loader.cpp, EasternKingdoms/eastern_kingdoms_script_loader.cpp, …).

SmartAI (data-driven creature behaviour) lives in the world DB's smart_scripts table, not C++ (engine: src/server/game/AI/SmartScripts/). For new creature behaviour prefer SmartAI (via the SQL update workflow); reach for CreatureScript only when SmartAI's event/action vocabulary isn't enough.

Module hooks (e.g. OnPlayerLogin, OnWorldUpdate, OnSpellCast) are declared in src/server/game/Scripting/ScriptDefines/*.h. Implement by inheriting the matching base (PlayerScript, WorldScript, …) and registering with new MyClass(); (or its RegisterXxxScript macro) inside AddSC_<name>(). Full list: https://www.azerothcore.org/wiki/hooks-script.

Conventions:

  • Script ids (action/event/data/phase) get named enum entries — never raw literals, even when the file already uses them: add the entry and convert that literal's every call site and handler in the same change.
  • A SpellScript/AuraScript without a matching spell_script_names row is inert — ship the binding SQL update in the same change as the C++ registration.
  • Never add UNIT_FLAG* / UNIT_FLAG2* / UNIT_DYNFLAG* values without sniff or upstream evidence; the same flag used in another script is not evidence.
  • Trigger NPCs (creature_template.flags_extra 0x80) have no threat list — SelectTarget / AddThreat / UpdateVictim chains on them silently do nothing. A never-evading helper NPC left on a boss's threatened-by list also stalls the boss's evade/reset forever; make such helpers IMMUNE_TO_NPC.
  • A spell id missing from Wowhead is inconclusive — check the world DB's spell_dbc table (server-side spells) before concluding a sniffed id doesn't exist.

Custom (non-upstream) scripts go in src/server/scripts/Custom/ (gitignored).