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Encrypting Editor Notepad Replacement

, 28 Jul 2014 CPOL
A C# .NET 3.5 (Win7) Windows Forms Application with source code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace CryptPad
{
	public partial class Replace : Form
	{
		CryptPad Crypt_Pad;

		public Replace ()
		{
			InitializeComponent ();
			this.Font = SystemFonts.MessageBoxFont;
		}

		private void Replace_Load (object sender, EventArgs e)
		{
			Crypt_Pad = (CryptPad) this.Owner;
			this.textFind.Text = Crypt_Pad.find_string;
			comboBoxPatterns.Tag = textFind;
			this.textReplace.Text = Crypt_Pad.replace_string;
			this.checkBoxRegEx.Checked = null != Crypt_Pad.find_regex;
			this.comboBoxPatterns.SelectedIndexChanged += new System.EventHandler (Crypt_Pad.comboBoxPatterns_SelectedIndexChanged);
			this.comboBoxPatterns.Click += new System.EventHandler (Crypt_Pad.comboBoxPatterns_Click);
			UpdateFindNextButton ();
			Crypt_Pad.Position (this);
		}

		private void Replace_FormClosed (object sender, FormClosedEventArgs e)
		{
			Crypt_Pad.replace_Form = null;
		}

		private void textFind_Enter (object sender, EventArgs e)
		{
			comboBoxPatterns.Tag = textFind;
			comboBoxPatterns.Items.Clear ();
			comboBoxPatterns.Items.AddRange (Crypt_Pad.combo_search);
			comboBoxPatterns.Items.AddRange (Crypt_Pad.combo_base);
			if (checkBoxRegEx.Checked)
				comboBoxPatterns.Items.AddRange (Crypt_Pad.combo_regex_find);
			comboBoxPatterns.Text = (string) comboBoxPatterns.Items[0];
		}

		private void textFind_TextChanged (object sender, EventArgs e)
		{
			UpdateFindNextButton ();
		}

		private void textReplace_Enter (object sender, EventArgs e)
		{
			comboBoxPatterns.Tag = textReplace;
			comboBoxPatterns.Items.Clear ();
			comboBoxPatterns.Items.AddRange (Crypt_Pad.combo_replacement);
			comboBoxPatterns.Items.AddRange (Crypt_Pad.combo_base);
			if (checkBoxRegEx.Checked)
				comboBoxPatterns.Items.AddRange (Crypt_Pad.combo_regex_replace);
			comboBoxPatterns.Text = (string) comboBoxPatterns.Items[0];
		}

		private void checkBoxRegEx_CheckedChanged (object sender, EventArgs e)
		{
			((TextBox) comboBoxPatterns.Tag).Focus ();
		}

		private void UpdateFindNextButton ()
		{
			if (0 < this.textFind.Text.Length)
			{
				this.buttonFindNext.Enabled = true;
				this.buttonReplace.Enabled = true;
				this.buttonReplaceAll.Enabled = true;
			}
			else
			{
				this.buttonFindNext.Enabled = false;
				this.buttonReplace.Enabled = false;
				this.buttonReplaceAll.Enabled = false;
			}
		}

		private void buttonFindNext_Click (object sender, EventArgs e)
		{
			Crypt_Pad.replace_string = this.textReplace.Text;
			Crypt_Pad.checkBoxMatchCase = this.checkBoxMatchCase.Checked;
			if (Crypt_Pad.checkBoxRegEx (this.checkBoxRegEx.Checked, this.textFind.Text))
				return;
			Crypt_Pad.FindNext (true);
			Crypt_Pad.Position (this);
		}

		private void buttonReplace_Click (object sender, EventArgs e)
		{
			Crypt_Pad.replace_string = this.textReplace.Text;
			Crypt_Pad.checkBoxMatchCase = this.checkBoxMatchCase.Checked;
			if (Crypt_Pad.checkBoxRegEx (this.checkBoxRegEx.Checked, this.textFind.Text))
				return;
			string str_replace = Crypt_Pad.Unescape (Crypt_Pad.replace_string);
			if (null != Crypt_Pad.find_regex)
			{
				Match match = Crypt_Pad.find_regex.Match (Crypt_Pad.txtBody.SelectedText);
				if (match.Success)
				{
					string s = Crypt_Pad.find_regex.Replace (Crypt_Pad.txtBody.SelectedText, str_replace);
					Crypt_Pad.txtBody.Paste (s);
					Crypt_Pad.txtBody.SelectionStart -= s.Length;
					Crypt_Pad.txtBody.SelectionLength = s.Length;
				}
			}
			else
			{
				string str_find = Crypt_Pad.Unescape (Crypt_Pad.find_string);
				if (this.checkBoxMatchCase.Checked)
				{
					if (str_find == Crypt_Pad.txtBody.SelectedText)
					{
						Crypt_Pad.txtBody.Paste (str_replace);
						Crypt_Pad.txtBody.SelectionStart -= str_replace.Length;
						Crypt_Pad.txtBody.SelectionLength = str_replace.Length;
					}
				}
				else
				{
					if (str_find.Equals (Crypt_Pad.txtBody.SelectedText,
						StringComparison.CurrentCultureIgnoreCase))
					{
						Crypt_Pad.txtBody.Paste (str_replace);
						Crypt_Pad.txtBody.SelectionStart -= str_replace.Length;
						Crypt_Pad.txtBody.SelectionLength = str_replace.Length;
					}
				}
			}
			Crypt_Pad.FindNext (true);
			Crypt_Pad.Position (this);
		}

		private void buttonReplaceAll_Click (object sender, EventArgs e)
		{
			Crypt_Pad.RememberCaretPosition ();
			int i, j;
			Crypt_Pad.replace_string = this.textReplace.Text;
			Crypt_Pad.checkBoxMatchCase = this.checkBoxMatchCase.Checked;
			if (Crypt_Pad.checkBoxRegEx (this.checkBoxRegEx.Checked, this.textFind.Text))
				return;
			// first we determine if there are zero, one, or more matches
			string s = Crypt_Pad.txtBody.Text;
			string str_replace = Crypt_Pad.Unescape (Crypt_Pad.replace_string);
			if (null != Crypt_Pad.find_regex)
			{
				Match match = Crypt_Pad.find_regex.Match (s);
				if (!match.Success)
				{
					Crypt_Pad.RestoreCaretPosition ();
					Crypt_Pad.NotFound ();
					return;
				}
				int index = match.Groups[0].Index;
				int length = match.Groups[0].Value.Length;
				s = match.Groups[0].Value;
				match = match.NextMatch ();
				if (!match.Success)
				{
					s = Crypt_Pad.find_regex.Replace (s, str_replace);
					ReplaceSelect (index, length, s);
					return;
				}
				s = Crypt_Pad.find_regex.Replace (Crypt_Pad.txtBody.Text, str_replace);
				Crypt_Pad.txtBody.SelectAll ();
				Crypt_Pad.txtBody.Paste (s);
				Crypt_Pad.RestoreCaretPosition ();
				return;
			}
			// simple string replace
			string str_find = Crypt_Pad.Unescape (Crypt_Pad.find_string);
			if (checkBoxMatchCase.Checked)
			{
				i = s.IndexOf (str_find);
				j = s.LastIndexOf (str_find);
			}
			else
			{
				i = s.IndexOf (str_find, StringComparison.CurrentCultureIgnoreCase);
				j = s.LastIndexOf (str_find, StringComparison.CurrentCultureIgnoreCase);
			}
			// zero matches so give the error Notepad doesn't
			if (0 > i)
			{
				Crypt_Pad.RestoreCaretPosition ();
				Crypt_Pad.NotFound ();
				return;
			}
			// one match so change just that one for simple undo
			if (i == j)
			{
				ReplaceSelect (i, str_find.Length, str_replace);
				return;
			}
			// multiple matches so undo the whole shebang
			if (checkBoxMatchCase.Checked)
			{
				// easy to use standard function
				s = s.Replace (str_find, str_replace);
			}
			else
			{
				// harder to do our own
				j = str_find.Length;

				for (; ; )
				{
					s = s.Substring (0, i) + str_replace + s.Substring (i + j);
					i = s.IndexOf (str_find, i + str_replace.Length, StringComparison.CurrentCultureIgnoreCase);
					if (0 > i)
						break;
				}
			}
			Crypt_Pad.txtBody.SelectAll ();
			Crypt_Pad.txtBody.Paste (s);
			Crypt_Pad.RestoreCaretPosition ();
		}

		/// <summary> Common to regex and simple single case replace
		/// </summary>
		/// <param name="i"></param>
		/// <param name="j"></param>
		/// <param name="s"></param>
		private void ReplaceSelect (int i, int j, string s)
		{
			Crypt_Pad.txtBody.Select (i, j);
			Crypt_Pad.txtBody.Paste (s);
			Crypt_Pad.SelectScroll (i, s.Length);
			Messagebox_Class.Messagebox.Show ("Selected the only replacement.");
			Crypt_Pad.SelectScroll (i, s.Length);
			Crypt_Pad.RestoreCaretPosition ();
			return;
		}

		private void buttonCancel_Click (object sender, EventArgs e)
		{
			this.Close ();
		}

		private void contextMenuStripFind_Opening (object sender, CancelEventArgs e)
		{
			toolStripMenuUndo.Enabled = textFind.CanUndo;
			toolStripMenuPaste.Enabled = Clipboard.ContainsText ();
			if (0 < textFind.SelectionLength)
			{
				toolStripMenuCut.Enabled = true;
				toolStripMenuCopy.Enabled = true;
				toolStripMenuDelete.Enabled = true;
			}
			else
			{
				toolStripMenuCut.Enabled = false;
				toolStripMenuCopy.Enabled = false;
				toolStripMenuDelete.Enabled = false;
			}
		}

		private void toolStripMenuUndo_Click (object sender, EventArgs e)
		{
			textFind.Undo ();
		}

		private void toolStripMenuCut_Click (object sender, EventArgs e)
		{
			string s = textFind.SelectedText;
			if (!checkBoxRegEx.Checked)
				s = Crypt_Pad.Unescape (s);
			Clipboard.SetText (s);
			textFind.Paste ("");
		}

		private void toolStripMenuCopy_Click (object sender, EventArgs e)
		{
			string s = textFind.SelectedText;
			if (!checkBoxRegEx.Checked)
				s = Crypt_Pad.Unescape (s);
			Clipboard.SetText (s);
		}

		private void toolStripMenuPaste_Click (object sender, EventArgs e)
		{
			string s = Clipboard.GetText ();
			if (!checkBoxRegEx.Checked)
				s = Crypt_Pad.Escape (s);
			textFind.Paste (s);
		}

		private void toolStripMenuDelete_Click (object sender, EventArgs e)
		{
			if (0 == this.textFind.SelectionLength)
				textFind.SelectionLength = 1;
			textFind.Paste ("");
		}

		private void toolStripMenuSelectAll_Click (object sender, EventArgs e)
		{
			textFind.SelectAll ();
		}

		private void contextMenuStripReplace_Opening (object sender, CancelEventArgs e)
		{
			toolStripReplaceMenuUndo.Enabled = textReplace.CanUndo;
			toolStripReplaceMenuPaste.Enabled = Clipboard.ContainsText ();
			if (0 < textReplace.SelectionLength)
			{
				toolStripReplaceMenuCut.Enabled = true;
				toolStripReplaceMenuCopy.Enabled = true;
				toolStripReplaceMenuDelete.Enabled = true;
			}
			else
			{
				toolStripReplaceMenuCut.Enabled = false;
				toolStripReplaceMenuCopy.Enabled = false;
				toolStripReplaceMenuDelete.Enabled = false;
			}
		}

		private void toolStripReplaceMenuUndo_Click (object sender, EventArgs e)
		{
			textReplace.Undo ();
		}

		private void toolStripReplaceMenuCut_Click (object sender, EventArgs e)
		{
			string s = textReplace.SelectedText;
			if (!checkBoxRegEx.Checked)
				s = Crypt_Pad.Unescape (s);
			Clipboard.SetText (s);
			textReplace.Paste ("");
		}

		private void toolStripReplaceMenuCopy_Click (object sender, EventArgs e)
		{
			string s = textReplace.SelectedText;
			if (!checkBoxRegEx.Checked)
				s = Crypt_Pad.Unescape (s);
			Clipboard.SetText (s);
		}

		private void toolStripReplaceMenuPaste_Click (object sender, EventArgs e)
		{
			string s = Clipboard.GetText ();
			if (!checkBoxRegEx.Checked)
				s = Crypt_Pad.Escape (s);
			textReplace.Paste (s);
		}

		private void toolStripReplaceMenuDelete_Click (object sender, EventArgs e)
		{
			if (0 == this.textReplace.SelectionLength)
				textReplace.SelectionLength = 1;
			textReplace.Paste ("");
		}

		private void toolStripReplaceMenuSelectAll_Click (object sender, EventArgs e)
		{
			textReplace.SelectAll ();
		}

	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Frank T. Clark
Systems Engineer Three Angels Broadcasting Network
United States United States
I am a Software Systems Design Engineer experienced with IEEE standards and the entire IEEE software development life cycle. Concept Exploration, Requirements, Design, Implementation, Test, Installation and Checkout, Operation and Maintenance. I enjoy working with people and solving customer problems.

I am currently employed as Information Technology Staff in the religious satellite broadcasting industry.

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