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Routines |
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Prepares a clause in the parser workspace before the grammar is tried.
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| InglishPrepareTheClause | 30068 | DEFB 0,0,0,0,0,0 | ||
| 30074 | DEFB 0 | |||
| 30075 | DEFB 0,0,0,0,0,0,0,0 | |||
| 30083 | DEFB 0,0 | |||
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This entry point is used by the routine at TurnReadAndTokeniseTheCommand.
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| InglishPrepareTheClause_0 | 30085 | LD IY,47560 | Point IY at the parser workspace. | |
| 30089 | XOR A | Clear the conjunction count. | ||
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This entry point is used by the routine at Command_FollowTheGrammarFlag.
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| InglishPrepareTheClause_1 | 30090 | LD (46875),A | Write A to 46875. | |
| 30093 | CALL Inglish_ClearTheMatcherPhase_0 | Call Inglish_ClearTheMatcherPhase_0 to clear the matcher phase. | ||
| 30096 | LD (46854),A | Write 0 to 46854. | ||
| 30099 | LD E,255 | The class marker starts at 255. | ||
| 30101 | LD A,(46874) | Read the matcher path flag. | ||
| 30104 | AND A | See whether the matcher path flag is zero. | ||
| 30105 | LD D,160 | Class 160 is used when a game is already in progress. | ||
| 30107 | JP NZ,InglishMatchOneWord_MarkTheClauseByte | If A is not zero jump to InglishMatchOneWord_MarkTheClauseByte. | ||
| 30110 | LD D,192 | Class 192 is used for a fresh game. | ||
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This entry point is used by the routines at InglishMatchOneWord and Command_MatchASpecialKey.
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| InglishPrepareTheClause_2 | 30112 | XOR A | Write 0 to 30074. | |
| 30113 | LD (30074),A | |||
| 30116 | LD A,E | Take the class marker 255 into A. | ||
| 30117 | OR 199 | Merge in 199. | ||
| 30119 | LD E,A | Keep the merged class flags in E. | ||
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Test the matcher phase.
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| 30120 | LD A,(46873) | Jump to InglishPrepareTheClause_BlankAParserSlot if *46873 is not 2. | ||
| 30123 | CP 2 | |||
| 30125 | JR NZ,InglishPrepareTheClause_BlankAParserSlot | |||
| 30127 | RES 1,E | Clear bit 1. | ||
| InglishPrepareTheClause_BlankAParserSlot | 30129 | CALL Inglish_BlankAParserSlot | Call Inglish_BlankAParserSlot to blank a parser slot. | |
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This entry point is used by the routines at InglishAcceptTheClause, InglishRestoreTheMatch, InglishRunTheGrammar, Inglish_AskWhat, CommandDispatchAControl, Command_FollowTheGrammarFlag and DisplayLocateHelpMessage.
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| InglishPrepareTheClause_3 | 30132 | LD HL,30075 | Write 0 to 10 bytes, starting from 30075 with Blanker. | |
| 30135 | LD B,10 | |||
| 30137 | CALL Blanker | |||
| 30140 | SET 4,E | Set bit 4. | ||
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This entry point is used by the routine at InglishTryTheNextClass.
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| InglishPrepareTheClause_4 | 30142 | CALL Inglish_ReadTheNextGrammarByte | Call Inglish_ReadTheNextGrammarByte to read the next grammar byte. | |
| 30145 | PUSH DE | Save DE. | ||
| 30146 | RRCA | Turn the grammar byte into a jump-table offset. | ||
| 30147 | RRCA | |||
| 30148 | RRCA | |||
| 30149 | LD E,A | Keep the jump-table offset in E. | ||
| 30150 | LD D,0 | The grammar-table offset's high byte is zero. | ||
| 30152 | LD HL,30162 | Point HL at entry DE of JumpTable. | ||
| 30155 | ADD HL,DE | |||
| 30156 | LD E,(HL) | Read the low byte of the handler. | ||
| 30157 | INC HL | Step to the high byte of the handler. | ||
| 30158 | LD D,(HL) | Read the high byte of the handler. | ||
| 30159 | EX DE,HL | Point HL at the handler. | ||
| 30160 | POP DE | Jump to the action handler the caller addressed. | ||
| 30161 | JP (HL) | |||
| JumpTable | 30162 | DEFW InglishAcceptTheClause | ||
| 30164 | DEFW InglishCheckTheWordClass | |||
| 30166 | DEFW InglishRejectAClass | |||
| 30168 | DEFW InglishRestoreTheMatch | |||
| 30170 | DEFW InglishClearTheMatchBit | |||
| 30172 | DEFW InglishRunTheGrammar | |||
| 30174 | DEFW InglishStepOverAGroup | |||
| 30176 | DEFW InglishWalkTheGrammar | |||
| 30178 | DEFW InglishTryTheNextClass | |||
| 30180 | DEFW Command_MatchASpecialKey | |||
| 30182 | DEFW InglishSaveTheMatch | |||
| 30184 | DEFW InglishMatchOneWord | |||
| 30186 | DEFW InglishClearTheRepeatFlag | |||
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