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Copyright 2021 Anton Krotov |
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This file is part of CEdit. |
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CEdit is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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CEdit is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with CEdit. If not, see . |
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*) |
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MODULE ChangeLog; |
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IMPORT List, Lines, (*API,*) SYSTEM; |
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TYPE |
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tIntItem = POINTER TO RECORD (List.tItem) |
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adr, val: INTEGER |
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END; |
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tBoolItem = POINTER TO RECORD (List.tItem) |
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adr: INTEGER; val: BOOLEAN |
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END; |
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(* |
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tUntypedPtr = POINTER TO RECORD (List.tItem) |
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p: INTEGER |
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END; |
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tTypedPtr = POINTER TO RECORD (List.tItem) |
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p: List.tItem |
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END; |
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*) |
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tGuard* = POINTER TO RECORD (List.tItem) |
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END; |
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VAR |
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Log*: List.tList; |
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guard: tGuard; |
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isLast: BOOLEAN; |
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PROCEDURE isLastGuard* (guard: tGuard): BOOLEAN; |
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VAR |
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item: List.tItem; |
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res: BOOLEAN; |
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BEGIN |
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IF guard # NIL THEN |
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item := Log.last; |
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WHILE ~(item IS tGuard) DO |
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item := item.prev |
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END; |
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res := guard = item |
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ELSE |
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res := TRUE |
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END |
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RETURN res |
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END isLastGuard; |
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PROCEDURE isFirstGuard* (guard: tGuard): BOOLEAN; |
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VAR |
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item: List.tItem; |
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BEGIN |
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ASSERT(guard # NIL); |
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item := Log.first; |
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WHILE ~(item IS tGuard) DO |
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item := item.next |
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END |
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RETURN guard = item |
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END isFirstGuard; |
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PROCEDURE setGuard* (_guard: tGuard); |
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BEGIN |
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guard := _guard; |
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isLast := isLastGuard(_guard) |
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END setGuard; |
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PROCEDURE redo* (item: List.tItem); |
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BEGIN |
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IF item IS tIntItem THEN |
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SYSTEM.PUT(item(tIntItem).adr, item(tIntItem).val) |
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ELSIF item IS tBoolItem THEN |
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SYSTEM.PUT(item(tBoolItem).adr, item(tBoolItem).val) |
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END |
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END redo; |
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PROCEDURE clear (guard: tGuard); |
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VAR |
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item: List.tItem; |
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(*res: INTEGER;*) |
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BEGIN |
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isLast := TRUE; |
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REPEAT |
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item := List.pop(Log); |
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IF item # guard THEN |
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(* |
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IF item IS tUntypedPtr THEN |
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res := API._DISPOSE(item(tUntypedPtr).p) |
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ELSIF item IS tTypedPtr THEN |
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DISPOSE(item(tTypedPtr).p) |
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END;*) |
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DISPOSE(item) |
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END |
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UNTIL item = guard; |
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List.append(Log, item) |
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END clear; |
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PROCEDURE changeWord (adrV, adrX: INTEGER); |
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VAR |
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item: tIntItem; |
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BEGIN |
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NEW(item); |
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item.adr := adrV; |
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SYSTEM.GET(adrX, item.val); |
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IF ~isLast THEN |
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clear(guard) |
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END; |
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List.append(Log, item) |
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END changeWord; |
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PROCEDURE changeBool (VAR v: BOOLEAN; x: BOOLEAN); |
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VAR |
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item: tBoolItem; |
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BEGIN |
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NEW(item); |
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item.adr := SYSTEM.ADR(v); |
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item.val := x; |
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IF ~isLast THEN |
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clear(guard) |
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END; |
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List.append(Log, item) |
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END changeBool; |
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PROCEDURE changeInt (VAR v: INTEGER; x: INTEGER); |
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BEGIN |
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changeWord(SYSTEM.ADR(v), SYSTEM.ADR(x)) |
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END changeInt; |
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PROCEDURE changePtr (VAR v: List.tItem; x: List.tItem); |
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BEGIN |
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changeWord(SYSTEM.ADR(v), SYSTEM.ADR(x)) |
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END changePtr; |
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(* |
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PROCEDURE typedPtr (p: List.tItem); |
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VAR |
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item: tTypedPtr; |
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BEGIN |
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NEW(item); |
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item.p := p; |
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List.append(Log, item) |
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END typedPtr; |
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PROCEDURE untypedPtr (p: INTEGER); |
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VAR |
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item: tUntypedPtr; |
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BEGIN |
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NEW(item); |
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item.p := p; |
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List.append(Log, item) |
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END untypedPtr; |
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*) |
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BEGIN |
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guard := NIL; |
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isLast := TRUE; |
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List.init(changeInt, changePtr); |
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Lines.init(changeInt, changePtr, changeBool(*, typedPtr, untypedPtr*)); |
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Log := List.create(NIL) |
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END ChangeLog. |