1 files changed, 85 insertions, 0 deletions
diff --git a/src/home/effect_commands.asm b/src/home/effect_commands.asm
new file mode 100644
index 0000000..9446d33
--- /dev/null
+++ b/src/home/effect_commands.asm
@@ -0,0 +1,85 @@
+; Checks if the command type at a is one of the commands of the attack or
+; card effect currently in use, and executes its associated function if so.
+; input:
+   ; a = command type to check
+   ; [wLoadedAttackEffectCommands] = pointer to list of commands of current attack or trainer card
+TryExecuteEffectCommandFunction:
+	push af
+	; grab pointer to command list from wLoadedAttackEffectCommands
+	ld hl, wLoadedAttackEffectCommands
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	pop af
+	call CheckMatchingCommand
+	jr nc, .execute_function
+	; return if no matching command was found
+	or a
+	ret
+
+.execute_function
+	; execute the function at [wEffectFunctionsBank]:hl
+	ldh a, [hBankROM]
+	push af
+	ld a, [wEffectFunctionsBank]
+	call BankswitchROM
+	or a
+	call CallHL
+	push af
+	; restore original bank and return
+	pop bc
+	pop af
+	call BankswitchROM
+	push bc
+	pop af
+	ret
+
+; input:
+  ; a = command type to check
+  ; hl = list of commands of current attack or trainer card
+; return nc if command type matching a is found, carry otherwise
+CheckMatchingCommand:
+	ld c, a
+	ld a, l
+	or h
+	jr nz, .not_null_pointer
+	; return carry if pointer is NULL
+	scf
+	ret
+
+.not_null_pointer
+	ldh a, [hBankROM]
+	push af
+	ld a, BANK(EffectCommands)
+	call BankswitchROM
+	; store the bank number of command functions ($b) in wEffectFunctionsBank
+	ld a, BANK("Effect Functions")
+	ld [wEffectFunctionsBank], a
+.check_command_loop
+	ld a, [hli]
+	or a
+	jr z, .no_more_commands
+	cp c
+	jr z, .matching_command_found
+	; skip function pointer for this command and move to the next one
+	inc hl
+	inc hl
+	jr .check_command_loop
+
+.matching_command_found
+	; load function pointer for this command
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	; restore bank and return nc
+	pop af
+	call BankswitchROM
+	or a
+	ret
+
+.no_more_commands
+	; restore bank and return c
+	pop af
+	call BankswitchROM
+	scf
+	ret