Routines
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44719: Parser: Count Item References
Used by the routines at Parser_ValidateDirectObject, Parser_ValidateInputTokens and Parser_ValidateAnyDirectObject.
Count how many tokens in the user input refer to game items.
Output
A The number of references to items in the user input tokens
F The Z flag is set when there are no items present in the input
Parser_CountItems 44719 LD HL,43044 Set a pointer to UserInput_Token_1 in HL.
44722 LD B,10 Set a token count in B of 10 which is the total length of the user input tokens.
44724 LD E,0 Initialise the item counter held in E to 0.
Parser_CountItems_Loop 44726 LD A,(HL) Fetch a user input token.
44727 CP 255 Jump to Parser_CountItems_Process if the terminator character (255) has been reached.
44729 JR Z,Parser_CountItems_Process
44731 PUSH HL Stash the token pointer and token counter on the stack.
44732 PUSH BC
44733 LD HL,(42968) HL=*Pointer_ObjectList.
44736 LD BC,(42984) Fetch the count of the number of items in the table from *Count_Objects.
44740 CPIR Search to see if the item room ID is in the table.
44742 POP BC Restore the token counter and token pointer from the stack.
44743 POP HL
44744 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.
44746 INC E Increment item counter by one.
Parser_CountItems_Skip 44747 INC HL Move to the next token.
44748 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 44750 XOR A Transfer the item count into A and set flags accordingly.
44751 OR E
44752 RET Return.
View the equivalent code in The Jewels Of Babylon.
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