Added solution for "Day 3: Gear Ratios", part 1, and added test project

AdventOfCode.lpi

@@ -41,6 +41,10 @@
         <Filename Value="USolver.pas"/>
         <IsPartOfProject Value="True"/>
       </Unit>
+      <Unit>
+        <Filename Value="solvers\UGearRatios.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
     </Units>
   </ProjectOptions>
   <CompilerOptions>

AdventOfCode.lpr

@@ -25,7 +25,7 @@ uses
   {$ENDIF}
   Classes, SysUtils, CustApp,
   USolver,
-  UTrebuchet, UCubeConundrum;
+  UTrebuchet, UCubeConundrum, UGearRatios;
 
 type
 
@@ -52,6 +52,7 @@ begin
   TTrebuchet.Run;
   TCubeConundrum.Run;
   engine := TSolverEngine.Create;
+  engine.RunAndFree(TGearRatios.Create);
   engine.Free;
 end;
 

USolver.pas

@@ -53,7 +53,6 @@ type
     procedure Init; virtual;
     procedure ProcessDataLine(const ALine: string); virtual; abstract;
     procedure Finish; virtual; abstract;
-    procedure Free; virtual;
     function GetDataFileName: string; virtual; abstract;
     function GetPuzzleName: string; virtual; abstract;
     function GetResultPart1: Integer; virtual;
@@ -80,11 +79,6 @@ begin
   FPart2 := 0;
 end;
 
-procedure TSolver.Free;
-begin
-  Free;
-end;
-
 function TSolver.GetResultPart1: Integer;
 begin
   Result := FPart1;

solvers/UGearRatios.pas

@@ -0,0 +1,147 @@
+{
+  Solutions to the Advent Of Code.
+  Copyright (C) 2023  Stefan Müller
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <http://www.gnu.org/licenses/>.
+}
+
+unit UGearRatios;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, USolver;
+
+const
+  CDigitChars = ['0'..'9'];
+  CNonSymbolChars = ['0'..'9', '.'];
+
+type
+
+  { TGearRatios }
+
+  TGearRatios = class(TSolver)
+  private
+    FPreviousLine, FLine: string;
+    procedure ProcessDataLineTriplet(const APreviousLine, ALine, ANextLine: string);
+  public
+    procedure ProcessDataLine(const ALine: string); override;
+    procedure Finish; override;
+    function GetDataFileName: string; override;
+    function GetPuzzleName: string; override;
+  end;
+
+implementation
+
+{ TGearRatios }
+
+procedure TGearRatios.ProcessDataLineTriplet(const APreviousLine, ALine, ANextLine: string);
+var
+  i, numberStart, numberLength, partNumber: Integer;
+  inNumber, isPartNumber: Boolean;
+begin
+  inNumber := False;
+
+  for i := 1 to ALine.Length do
+  begin
+    // Checks if number starts.
+    if not inNumber and (ALine[i] in CDigitChars) then
+    begin
+      inNumber := True;
+      numberStart := i;
+
+      // Checks for a symbol in the column before the first digit.
+      isPartNumber := (i > 1) and
+        (not (APreviousLine[i - 1] in CNonSymbolChars)
+        or not (ALine[i - 1] in CNonSymbolChars)
+        or not (ANextLine[i - 1] in CNonSymbolChars));
+    end;
+
+    // Checks for a symbol in the column of the current digit.
+    if inNumber and not isPartNumber and
+      (not (APreviousLine[i] in CNonSymbolChars)
+      or not (ANextLine[i] in CNonSymbolChars)) then
+    begin
+      isPartNumber := True;
+    end;
+
+    // Checks if number ends.
+    if inNumber and (not (ALine[i] in CDigitChars) or (i = ALine.Length)) then
+    begin
+      inNumber := False;
+
+      // Checks for a symbol in the column after the last digit.
+      if not (APreviousLine[i] in CNonSymbolChars)
+        or not (ALine[i] in CNonSymbolChars)
+        or not (ANextLine[i] in CNonSymbolChars) then
+      begin
+        isPartNumber := True;
+      end;
+
+      // Counts if it is a part number.
+      if isPartNumber then
+      begin
+        numberLength := i - numberStart;
+        if ALine[i] in CDigitChars then
+          Inc(numberLength);
+        partNumber := StrToInt(Copy(ALine, numberStart, numberLength));
+        Inc(FPart1, partNumber);
+      end;
+    end;
+  end;
+end;
+
+procedure TGearRatios.ProcessDataLine(const ALine: string);
+begin
+  if not (FLine = '') then
+  begin
+    // Processes lines 2 to n - 1 in calls for lines 3 to n.
+    ProcessDataLineTriplet(FPreviousLine, FLine, ALine);
+    FPreviousLine := FLine;
+    FLine := ALine;
+  end
+  else if not (FPreviousLine = '') then
+  begin
+    // Processes line 1 in call for line 2.
+    FLine := ALine;
+    // Duplicates the first line for the algorithm because it does not influence the result.
+    ProcessDataLineTriplet(FPreviousLine, FPreviousLine, FLine);
+  end
+  else
+    // Processes nothing in call for line 1.
+    FPreviousLine := ALine;
+end;
+
+procedure TGearRatios.Finish;
+begin
+  // Processes line n.
+  // Duplicates the last line for the algorithm because it does not influence the result.
+  if FLine = '' then
+    FLine := FPreviousLine;
+  ProcessDataLineTriplet(FPreviousLine, FLine, FLine);
+end;
+
+function TGearRatios.GetDataFileName: string;
+begin
+  Result := 'gear_ratios.txt';
+end;
+
+function TGearRatios.GetPuzzleName: string;
+begin
+  Result := 'Day 3: Gear Ratios';
+end;
+
+end.
+

tests/AdventOfCodeFPCUnit.fpcunit.ini

@@ -0,0 +1,15 @@
+[WindowState]
+Left=664
+Top=189
+Width=575
+Height=663
+
+[Tests]
+All Tests.Checked=1
+All Tests.Expanded=1
+TGearRatiosTestCase.Checked=1
+TGearRatiosTestCase.Expanded=1
+TGearRatiosTestCase.TestPuzzleExample.Checked=1
+TGearRatiosTestCase.TestPuzzleExample.Expanded=0
+TGearRatiosTestCase.TestEndOfLineNumber.Checked=1
+TGearRatiosTestCase.TestEndOfLineNumber.Expanded=0

tests/AdventOfCodeFPCUnit.lpi

@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="12"/>
+    <PathDelim Value="\"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <Title Value="AdventOfCodeFPCUnit"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <BuildModes>
+      <Item Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <UseFileFilters Value="True"/>
+    </PublishOptions>
+    <RunParams>
+      <FormatVersion Value="2"/>
+    </RunParams>
+    <RequiredPackages>
+      <Item>
+        <PackageName Value="fpcunittestrunner"/>
+      </Item>
+      <Item>
+        <PackageName Value="LCL"/>
+      </Item>
+      <Item>
+        <PackageName Value="FCL"/>
+      </Item>
+    </RequiredPackages>
+    <Units>
+      <Unit>
+        <Filename Value="AdventOfCodeFPCUnit.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+      <Unit>
+        <Filename Value="UGearRatiosTestCases.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+      <Unit>
+        <Filename Value="..\USolver.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <PathDelim Value="\"/>
+    <Target>
+      <Filename Value="AdventOfCodeFPCUnit"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <OtherUnitFiles Value="..\solvers;.."/>
+      <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Debugging>
+        <DebugInfoType Value="dsDwarf3"/>
+      </Debugging>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions>
+      <Item>
+        <Name Value="EAbort"/>
+      </Item>
+      <Item>
+        <Name Value="ECodetoolError"/>
+      </Item>
+      <Item>
+        <Name Value="EFOpenError"/>
+      </Item>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

tests/AdventOfCodeFPCUnit.lpr

@@ -0,0 +1,15 @@
+program AdventOfCodeFPCUnit;
+
+{$mode objfpc}{$H+}
+
+uses
+  Interfaces, Forms, GuiTestRunner, UGearRatiosTestCases, USolver;
+
+{$R *.res}
+
+begin
+  Application.Initialize;
+  Application.CreateForm(TGuiTestRunner, TestRunner);
+  Application.Run;
+end.
+

tests/UGearRatiosTestCases.pas

@@ -0,0 +1,83 @@
+{
+  Solutions to the Advent Of Code.
+  Copyright (C) 2023  Stefan Müller
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <http://www.gnu.org/licenses/>.
+}
+
+unit UGearRatiosTestCases;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, fpcunit, testregistry, UGearRatios;
+
+type
+
+  { TGearRatiosTestCase }
+
+  TGearRatiosTestCase = class(TTestCase)
+  protected
+    FSolver: TGearRatios;
+    procedure Setup; override;
+    procedure TearDown; override;
+  published
+    procedure TestPuzzleExample;
+    procedure TestEndOfLineNumber;
+  end;
+
+implementation
+
+{ TGearRatiosTestCase }
+
+procedure TGearRatiosTestCase.Setup;
+begin
+  FSolver := TGearRatios.Create;
+end;
+
+procedure TGearRatiosTestCase.TearDown;
+begin
+  FSolver.Free;
+end;
+
+procedure TGearRatiosTestCase.TestPuzzleExample;
+begin
+  FSolver.Init;
+  FSolver.ProcessDataLine('467..114..');
+  FSolver.ProcessDataLine('...*......');
+  FSolver.ProcessDataLine('..35..633.');
+  FSolver.ProcessDataLine('......#...');
+  FSolver.ProcessDataLine('617*......');
+  FSolver.ProcessDataLine('.....+.58.');
+  FSolver.ProcessDataLine('..592.....');
+  FSolver.ProcessDataLine('......755.');
+  FSolver.ProcessDataLine('...$.*....');
+  FSolver.ProcessDataLine('.664.598..');
+  FSolver.Finish;
+  AssertEquals('Result of part 1 calculation incorrect.', 4361, FSolver.GetResultPart1);
+end;
+
+procedure TGearRatiosTestCase.TestEndOfLineNumber;
+begin
+  FSolver.Init;
+  FSolver.ProcessDataLine('...$541');
+  FSolver.Finish;
+  AssertEquals('Result of part 1 calculation incorrect.', 541, FSolver.GetResultPart1);
+end;
+
+initialization
+
+  RegisterTest(TGearRatiosTestCase);
+end.