Routines
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42105: Handler: Match Item
Used by the routine at Handler_UserInput.
Output
F The carry flag is set to indicate that an item was found
Handler_MatchItem 42105 PUSH HL Stash HL, DE, BC and IX on the stack.
42106 PUSH DE
42107 PUSH BC
42108 PUSH IX
Search the vocabulary from the address written into this instruction, which starts as Table_Vocabulary.
42110 LD HL,45293 A comma separates synonyms and 255 ends the table.
42113 LD C,0
42115 JR MatchItem_Word
Step to the next synonym. Each comma advances the token number.
MatchItem_NextWord 42117 LD E,B Skip a comma and keep the token number of the word before it.
42118 LD D,0
42120 ADD HL,DE
42121 LD A,(HL)
42122 CP 44
42124 JR Z,Handler_MatchItem_0
42126 INC C
42127 JR MatchItem_Word
Handler_MatchItem_0 42129 INC HL
The vocabulary is exhausted.
MatchItem_Word 42130 LD A,(HL) Jump to MatchItem_Return if the word is the 255 terminator.
42131 CP 255
42133 JR Z,MatchItem_Return
Compare the four-letter buffer at FourLetterBuffer with this word.
42135 LD IX,41285 Four letters, starting at FourLetterBuffer.
42139 LD B,4
MatchItem_Letter 42141 LD A,(IX+0) This letter does not match, so try the next synonym.
42144 CP (HL)
42145 JR NZ,MatchItem_NextWord
42147 INC HL The next letter of both words.
42148 INC IX
42150 DJNZ MatchItem_Letter
The word matched, so return its token with the carry set.
42152 LD A,C The token number is the count of commas passed on the way.
42153 SCF
Hand back the registers the search borrowed.
MatchItem_Return 42154 POP IX Restore IX, BC, DE and HL from the stack.
42156 POP BC
42157 POP DE
42158 POP HL
42159 RET Return.
View the equivalent code in;
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