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Routines |
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Used by the routine at GameLoop.
Matches the first word token from the user's command against the verb word tokens table. If a match is found, it calculates the verb index and jumps to the corresponding verb handler routine. If no match is found, it displays "I Don't Understand" and returns.
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Set up to search the verb word tokens table for the first word token.
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| Handler_MatchVerb | C556 | LD HL,($BD26) | Set a pointer to *Pointer_VerbWordTokens in HL. | |
| C559 | LD BC,($BD2C) | Load *Count_VerbTokens tokens into BC for the search. | ||
| C55D | LD A,($BD66) | Get the *UserInput_Token_1 from the user input. | ||
| C560 | CPIR | Search the verb word tokens table for a matching token. | ||
| C562 | JR Z,VerbMatched | Jump to VerbMatched if a match was found (Z flag is set). | ||
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The token doesn't match any verb. Display an error message: "I don't understand.".
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| C564 | LD HL,$BD91 | HL=Messaging_IDontUnderstand. | ||
| C567 | CALL PrintStringAndNewline | Call PrintStringAndNewline. | ||
| C56A | RET | Return. | ||
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A verb was matched! Calculate its index in the table and jump to its handler routine.
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| VerbMatched | C56B | LD A,($BD2C) | Calculate the verb index: A=*Count_VerbTokens-C (total tokens minus remaining tokens after match). | |
| C56E | SUB C | |||
| C56F | DEC A | Adjust the index (decrease by one, as indices are zero-based). | ||
| C570 | LD E,A | Store the verb index in E for the table lookup. | ||
| C571 | LD IX,($BD20) | Set a pointer to *Pointer_JumpTable_Verbs in IX. | ||
| C575 | CALL GetTableEntry | Call GetTableEntry to get the address of the verb handler routine for this index. | ||
| C578 | JP (HL) | Jump to the verb handler routine to execute the command. | ||
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