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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| program AdventOfCode8; | ||
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| {$APPTYPE CONSOLE} | ||
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| {$R *.res} | ||
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| uses | ||
| System.SysUtils, System.Generics.Collections, System.RegularExpressions, System.Math, | ||
| GpStreams, GpTextStream; | ||
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| type | ||
| TRegisters = class(TDictionary<string, integer>) | ||
| public | ||
| function Max: integer; | ||
| end; | ||
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| TInstruction = class | ||
| strict private | ||
| FParser: TRegEx; | ||
| FRegister: string; | ||
| FIncrement: integer; | ||
| FCondReg: string; | ||
| FCondOper: string; | ||
| FCondValue: integer; | ||
| protected | ||
| function Test(reg: TRegisters): boolean; | ||
| public | ||
| constructor Create; | ||
| procedure Parse(const s: string); | ||
| function Execute(reg: TRegisters): integer; | ||
| end; | ||
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| { TRegisters } | ||
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| function TRegisters.Max: integer; | ||
| var | ||
| i: Integer; | ||
| begin | ||
| Result := 0; | ||
| for i in Values do | ||
| if i > Result then | ||
| Result := i; | ||
| end; | ||
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| { TInstruction } | ||
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| constructor TInstruction.Create; | ||
| begin | ||
| FParser := TRegEx.Create('([a-z]+)\s+(dec|inc)\s+([\-0-9]+)\s+if\s+([a-z]+)\s+([^\s]+)+\s+([\-0-9]+)', [roIgnoreCase]); | ||
| end; | ||
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| function TInstruction.Execute(reg: TRegisters): integer; | ||
| var | ||
| regValue: integer; | ||
| begin | ||
| if Test(reg) then begin | ||
| if not reg.TryGetValue(FRegister, regValue) then | ||
| regValue := 0; | ||
| Result := regValue + FIncrement; | ||
| reg.AddOrSetValue(FRegister, Result); | ||
| end; | ||
| end; | ||
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| procedure TInstruction.Parse(const s: string); | ||
| var | ||
| match: TMatch; | ||
| mult : integer; | ||
| begin | ||
| match := FParser.Match(s); | ||
| if not match.Success then | ||
| raise Exception.Create('Invalid input: ' + s); | ||
| FRegister := match.Groups[1].Value; | ||
| mult := 1; | ||
| if SameText(match.Groups[2].Value, 'dec') then | ||
| mult := -1; | ||
| FIncrement := StrToInt(match.Groups[3].Value) * mult; | ||
| FCondReg := match.Groups[4].Value; | ||
| FCondOper := match.Groups[5].Value; | ||
| FCondValue := StrToInt(match.Groups[6].Value); | ||
| end; | ||
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| function TInstruction.Test(reg: TRegisters): boolean; | ||
| var | ||
| regValue: integer; | ||
| begin | ||
| if not reg.TryGetValue(FCondReg, regValue) then | ||
| regValue := 0; | ||
| if FCondOper = '==' then | ||
| Result := regValue = FCondValue | ||
| else if FCondOper = '!=' then | ||
| Result := regValue <> FCondValue | ||
| else if FCondOper = '<' then | ||
| Result := regValue < FCondValue | ||
| else if FCondOper = '<=' then | ||
| Result := regValue <= FCondValue | ||
| else if FCondOper = '>' then | ||
| Result := regValue > FCondValue | ||
| else if FCondOper = '>=' then | ||
| Result := regValue >= FCondValue | ||
| else | ||
| raise Exception.Create('Invalid conditional test: ' + FCondOper); | ||
| end; | ||
|
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| function PartA(const fileName: string): integer; | ||
| var | ||
| inst: TInstruction; | ||
| reg : TRegisters; | ||
| s : string; | ||
| begin | ||
| reg := TRegisters.Create; | ||
| try | ||
| inst := TInstruction.Create; | ||
| try | ||
| for s in EnumLines(AutoDestroyStream(SafeCreateFileStream(fileName, fmOpenRead)).Stream) do begin | ||
| inst.Parse(s); | ||
| inst.Execute(reg); | ||
| end; | ||
| finally FreeAndNil(inst); end; | ||
| Result := reg.Max; | ||
| finally FreeAndNil(reg); end; | ||
| end; | ||
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| function PartB(const fileName: string): integer; | ||
| var | ||
| inst: TInstruction; | ||
| reg : TRegisters; | ||
| s : string; | ||
| begin | ||
| Result := 0; | ||
| reg := TRegisters.Create; | ||
| try | ||
| inst := TInstruction.Create; | ||
| try | ||
| for s in EnumLines(AutoDestroyStream(SafeCreateFileStream(fileName, fmOpenRead)).Stream) do begin | ||
| inst.Parse(s); | ||
| Result := Max(Result, inst.Execute(reg)); | ||
| end; | ||
| finally FreeAndNil(inst); end; | ||
| finally FreeAndNil(reg); end; | ||
| end; | ||
|
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| begin | ||
| try | ||
| Assert(PartA('..\..\AdventOfCode8test.txt') = 1, 'PartA test failed'); | ||
| Assert(PartB('..\..\AdventOfCode8test.txt') = 10, 'PartB test failed'); | ||
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| Writeln(PartA('..\..\AdventOfCode8.txt')); | ||
| Writeln(PartB('..\..\AdventOfCode8.txt')); | ||
| except | ||
| on E: Exception do | ||
| Writeln(E.ClassName, ': ', E.Message); | ||
| end; | ||
| Readln; | ||
| end. |
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