Routines
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C3AE: Parser: Count Item References
Used by the routines at Parser_ValidateDirectObject, C490, C4B7 and Action_Shout.
Count how many tokens in the user input refer to game items.
Input
A The number of references to items in the user input tokens
F
Parser_CountItems C3AE LD HL,$BD66 Set a pointer to UserInput_Token_1 in HL.
C3B1 LD B,$0A Set a token count in B of 0A which is the total length of the user input tokens.
C3B3 LD E,$00 Initialise the item counter held in E to 00.
Parser_CountItems_Loop C3B5 LD A,(HL) Fetch a user input token.
C3B6 CP $FF Jump to Parser_CountItems_Process if the terminator character (FF) has been reached.
C3B8 JR Z,Parser_CountItems_Process
C3BA PUSH HL Stash the token pointer and token counter on the stack.
C3BB PUSH BC
C3BC LD HL,($BD1E) HL=*Pointer_ObjectList.
C3BF LD BC,($BD2A) BC=*Count_Objects.
C3C3 CPIR CPIR.
C3C5 POP BC Restore the token counter and token pointer from the stack.
C3C6 POP HL
C3C7 JR NZ,Parser_CountItems_Skip Jump to Parser_CountItems_Skip if this token doesn't refer to a game item.
This token does point to a game item, so increase the item counter.
C3C9 INC E Increment item counter by one.
Parser_CountItems_Skip C3CA INC HL Move to the next token.
C3CB DJNZ Parser_CountItems_Loop Decrease the token counter by one and loop back to Parser_CountItems_Loop until all the tokens have been evaluated.
Parser_CountItems_Process C3CD XOR A Transfer the item count into A and set flags accordingly.
C3CE OR E
C3CF RET Return.
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