Routines
Prev: 46432 Up: Map Next: 46500
46453: Match Phrase Tokens
Used by the routines at Handler_DispatchPhrase, Action_Light, Action_Rub, Action_Say and Action_Attack.
Match Phrase Tokens.
Input
HL A pointer to phrase token data
Output
F The Z flag is set if the input matches any pattern
MatchPhraseTokens 46453 EX DE,HL Move the phrase token pointer into DE.
46454 JR MatchPhraseTokens_Next Start the match at the first pattern byte, MatchPhraseTokens_Next.
Match_PhraseTokens_Loop 46456 INC DE Advance DE to the next byte.
MatchPhraseTokens_Next 46457 LD HL,44847 Point HL at the second word token.
46460 JR Match_PhraseTokens_Compare Compare the command from its first word at Match_PhraseTokens_Compare.
MatchPhraseTokens_Loop 46462 INC HL Advance HL to the next byte.
46463 INC DE Advance DE to the next byte.
Match_PhraseTokens_Compare 46464 LD A,(DE) Read the next vocabulary byte into A.
46465 CP (HL) Branch to MatchPhraseTokens_Loop when the byte at HL means the values match.
46466 JR Z,MatchPhraseTokens_Loop
46468 CP 254 Branch to Match_PhraseTokens_Alternative when 254 means the values differ.
46470 JR NZ,Match_PhraseTokens_Alternative
46472 LD A,(HL) Accept the phrase when the command has ended.
46473 CP 255
46475 RET
Match_PhraseTokens_Alternative 46476 CP 253 Branch to Match_PhraseTokens_Skip when 253 means the values differ.
46478 JR NZ,Match_PhraseTokens_Skip
46480 LD A,(HL) Match this alternative when the command has ended, and try the next one when the player typed another word.
46481 CP 255
46483 JR NZ,Match_PhraseTokens_Loop
46485 RET
Match_PhraseTokens_Skip 46486 INC DE Advance DE to the next byte.
46487 LD A,(DE) Read the next vocabulary byte into A.
46488 CP 254 Branch to Match_PhraseTokens_Done when 254 means the values match.
46490 JR Z,Match_PhraseTokens_Done
46492 CP 253 Branch to Match_PhraseTokens_Skip when 253 means the values differ.
46494 JR NZ,Match_PhraseTokens_Skip
46496 JR Match_PhraseTokens_Loop Try the next phrase alternative at Match_PhraseTokens_Loop.
Match_PhraseTokens_Done 46498 OR A Test A so the following branch can see whether it is zero.
46499 RET Return.
View the equivalent code in;
Prev: 46432 Up: Map Next: 46500