Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents RichTextBox1 As System.Windows.Forms.RichTextBox
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.RichTextBox1 = New System.Windows.Forms.RichTextBox()
        Me.MainMenu1 = New System.Windows.Forms.MainMenu()
        Me.MenuItem1 = New System.Windows.Forms.MenuItem()
        Me.MenuItem2 = New System.Windows.Forms.MenuItem()
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
        Me.SuspendLayout()
        '
        'RichTextBox1
        '
        Me.RichTextBox1.Anchor = (((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                    Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.RichTextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 15.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(178, Byte))
        Me.RichTextBox1.Location = New System.Drawing.Point(8, 8)
        Me.RichTextBox1.Name = "RichTextBox1"
        Me.RichTextBox1.Size = New System.Drawing.Size(584, 244)
        Me.RichTextBox1.TabIndex = 0
        Me.RichTextBox1.Text = ""
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        '
        'MenuItem1
        '
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2})
        Me.MenuItem1.Text = "File"
        '
        'MenuItem2
        '
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Open"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(600, 258)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.RichTextBox1})
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        OpenFileDialog1.DefaultExt = "TXT"
        OpenFileDialog1.Filter = "Text Files|*.TXT"
        OpenFileDialog1.FilterIndex = 1
        OpenFileDialog1.ShowDialog()
        If OpenFileDialog1.FileName = "" Then Exit Sub
        Dim TReader As System.IO.StreamReader
        TReader = New System.IO.StreamReader(OpenFileDialog1.FileName, System.Text.Encoding.Default)
        Dim Rt As New RichTextBox()
        Rt.Font = New Font(Rt.Font.Name, 20, FontStyle.Bold)
        Rt.SelectionAlignment = HorizontalAlignment.Right
        Rt.Text = TReader.ReadToEnd
        TReader.Close()
        TReader = Nothing
        ' تلوين علامات الترقيم
        Dim Ch() As Char = {".", ":", "؟", "?", "!", "،", "ـ ", "(", ")", "[", "]", "{", "}", """"}
        Dim Pos As Integer = -1
        Do
            Pos = Rt.Find(Ch, Pos + 1)
            If Pos = -1 Then Exit Do
            Rt.SelectionStart = Pos
            Rt.SelectionLength = 1
            Rt.SelectionColor = Color.Blue
        Loop

        ' تلوين الكلمات التي تبدأ بحرف @
        Dim EndOfWord As Integer, L As Integer = Rt.TextLength
        Pos = -1
        Ch = New Char() {" ", vbCr, ".", ":", "؟", "?", "!", "،", "ـ ", "(", ")", "[", "]", "{", "}", """"}
        Do
            Pos = Rt.Find("@", Pos + 1, RichTextBoxFinds.MatchCase)
            If Pos = -1 Or Pos >= L - 1 Then Exit Do
            ' حذف علامة @.. لاحظ أنّها محدّدة الآن في النصّ
            Rt.SelectedText = ""
            ' الآن صارت بداية الكلمة في نفس موضع العلامة المحذوفة
            Rt.SelectionStart = Pos
            EndOfWord = Rt.Find(Ch, Pos)
            If EndOfWord = -1 Then
                ' هذه آخر كلمة في النصّ
                Rt.SelectionLength = L - Pos
            Else
                Rt.SelectionLength = EndOfWord - Pos
            End If
            Rt.SelectionColor = Color.Red
        Loop
        RichTextBox1.Rtf = Rt.Rtf
    End Sub

    Private Sub RichTextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles RichTextBox1.KeyPress
        Select Case e.KeyChar
            Case ".", ":", "؟", "?", "!", "،", "ـ ", "(", ")", "[", "]", "{", "}", """"
                RichTextBox1.SelectionColor = Color.Blue
            Case Else
                RichTextBox1.SelectionColor = Color.Black
        End Select
    End Sub
End Class