Routines
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46500: Parser: Count Item References
Used by the routines at ParserValidateDirectObject, Parser_ValidateInputTokens and ParserValidateAnyDirectObject.
Parser: Count Item References.
Output
A The number of references to items in the user input tokens
E As A
F The Z flag is set when there are no items present in the input
ParserCountItemReferences 46500 LD HL,44846 Set a pointer to the first word token in HL.
46503 LD B,10 Set a token count in B of 10 which is the total length of the user input tokens.
46505 LD E,0 Initialise the item counter held in E to 0.
Parser_CountItems_Loop 46507 LD A,(HL) Fetch a user input token.
46508 CP 255 Jump to Parser_CountItems_Process if the terminator character (255) has been reached.
46510 JR Z,Parser_CountItems_Process
46512 PUSH HL Remember the token and the count while the object list is searched.
46513 PUSH BC
46514 LD HL,(44770) Load the pointer for the character-set pointer into HL.
46517 LD BC,(44786) Fetch the count of the number of items in the table from the object count.
46521 CPIR Search to see if the item room ID is in the table.
46523 POP BC Restore BC, HL from the stack.
46524 POP HL
46525 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.
46527 INC E Increment item counter by one.
Parser_CountItems_Skip 46528 INC HL Move to the next token.
46529 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 46531 XOR A Leave the number of items named in the command in A. The zero flag is set when none were named.
46532 OR E
46533 RET Return.
View the equivalent code in;
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