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string-processing-system [SORONIO] #14

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f2ff643
Create StringService.cs
lix-elle Feb 28, 2026
acb9ac4
Create StringProcessingApp
lix-elle Feb 28, 2026
5044152
Delete Services directory
lix-elle Feb 28, 2026
516edb5
Delete StringProcessingApp
lix-elle Feb 28, 2026
c5ae964
Create StringService.cs
lix-elle Feb 28, 2026
9a04015
Create StringView.cs
lix-elle Feb 28, 2026
ee32310
Create Program.cs
lix-elle Feb 28, 2026
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10 changes: 10 additions & 0 deletions StringProcessingApp/Program.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
using StringProcessingApp.Views;

class Program
{
static void Main(string[] args)
{
StringView view = new StringView();
view.Run();
}
}
40 changes: 40 additions & 0 deletions StringProcessingApp/Services/StringService.cs
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namespace StringProcessingApp.Services
{
public class StringService
{
private string originalText = "";
private string currentText = "";

public void SetText(string text)
{
originalText = text;
currentText = text;
}

public string GetCurrentText() => currentText;

public string ToUpperCase() => currentText = currentText.ToUpper();

public string ToLowerCase() => currentText = currentText.ToLower();

public int CountCharacters() => currentText.Length;

public bool ContainsWord(string word) => currentText.Contains(word);

public string ReplaceWord(string oldWord, string newWord)
=> currentText = currentText.Replace(oldWord, newWord);

public string ExtractSubstring(int startIndex, int length)
=> currentText.Substring(startIndex, length);

public string TrimSpaces() => currentText = currentText.Trim();

public string ResetText()
{
currentText = originalText;
return currentText;
}

public bool HasText() => !string.IsNullOrEmpty(currentText);
}
}
180 changes: 180 additions & 0 deletions StringProcessingApp/Views/StringView.cs
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using StringProcessingApp.Services;

namespace StringProcessingApp.Views
{
public class StringView
{
private readonly StringService _service = new StringService();

public void Run()
{
bool running = true;

while (running)
{
DisplayMenu();
Console.Write("Choose an option: ");
string? choice = Console.ReadLine();

Console.WriteLine();

switch (choice)
{
case "1":
EnterText();
break;
case "2":
ViewCurrentText();
break;
case "3":
ConvertToUpper();
break;
case "4":
ConvertToLower();
break;
case "5":
CountCharacters();
break;
case "6":
CheckContains();
break;
case "7":
ReplaceWord();
break;
case "8":
ExtractSubstring();
break;
case "9":
TrimSpaces();
break;
case "10":
ResetText();
break;
case "11":
running = false;
Console.WriteLine("Goodbye!");
break;
default:
Console.WriteLine("Invalid option. Please try again.");
break;
}

Console.WriteLine();
}
}

private void DisplayMenu()
{
Console.WriteLine("=============================");
Console.WriteLine(" STRING PROCESSING SYSTEM ");
Console.WriteLine("=============================");
Console.WriteLine("1. Enter Text");
Console.WriteLine("2. View Current Text");
Console.WriteLine("3. Convert to UPPERCASE");
Console.WriteLine("4. Convert to lowercase");
Console.WriteLine("5. Count Characters");
Console.WriteLine("6. Check if Contains Word");
Console.WriteLine("7. Replace Word");
Console.WriteLine("8. Extract Substring");
Console.WriteLine("9. Trim Spaces");
Console.WriteLine("10. Reset Text");
Console.WriteLine("11. Exit");
Console.WriteLine("=============================");
}

private void EnterText()
{
Console.Write("Enter your text: ");
string? input = Console.ReadLine();
if (!string.IsNullOrEmpty(input))
{
_service.SetText(input);
Console.WriteLine("Text saved successfully!");
}
else
{
Console.WriteLine("No text entered.");
}
}

private void ViewCurrentText()
{
if (!_service.HasText())
Console.WriteLine("No text entered yet.");
else
Console.WriteLine($"Current Text: \"{_service.GetCurrentText()}\"");
}

private void ConvertToUpper()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.WriteLine($"UPPERCASE: \"{_service.ToUpperCase()}\"");
}

private void ConvertToLower()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.WriteLine($"lowercase: \"{_service.ToLowerCase()}\"");
}

private void CountCharacters()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.WriteLine($"Character Count: {_service.CountCharacters()}");
}

private void CheckContains()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.Write("Enter word to search: ");
string? word = Console.ReadLine();
if (string.IsNullOrEmpty(word)) { Console.WriteLine("No word entered."); return; }
bool found = _service.ContainsWord(word);
Console.WriteLine(found
? $"✓ The text contains \"{word}\"."
: $"✗ The text does NOT contain \"{word}\".");
}

private void ReplaceWord()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.Write("Enter word to replace: ");
string? oldWord = Console.ReadLine();
Console.Write("Enter new word: ");
string? newWord = Console.ReadLine();
if (string.IsNullOrEmpty(oldWord) || newWord == null) { Console.WriteLine("Invalid input."); return; }
Console.WriteLine($"Result: \"{_service.ReplaceWord(oldWord, newWord)}\"");
}

private void ExtractSubstring()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.WriteLine($"Current Text: \"{_service.GetCurrentText()}\" (Length: {_service.CountCharacters()})");
Console.Write("Enter start index: ");
if (!int.TryParse(Console.ReadLine(), out int start)) { Console.WriteLine("Invalid index."); return; }
Console.Write("Enter length: ");
if (!int.TryParse(Console.ReadLine(), out int length)) { Console.WriteLine("Invalid length."); return; }

try
{
Console.WriteLine($"Substring: \"{_service.ExtractSubstring(start, length)}\"");
}
catch (ArgumentOutOfRangeException)
{
Console.WriteLine("Error: Index or length is out of range.");
}
}

private void TrimSpaces()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.WriteLine($"Trimmed: \"{_service.TrimSpaces()}\"");
}

private void ResetText()
{
if (!_service.HasText()) { Console.WriteLine("Please enter text first."); return; }
Console.WriteLine($"Text reset to: \"{_service.ResetText()}\"");
}
}
}