I'm doing syntax highlighting for an HTML rich text editor. The RTE is working fine except I want syntax highlighting. Here's what I've got so far:
This code is still in the making. ANyway, you can see that, if the key is not < (keycode 190) or SPACE it adds the character to a string called WORD. If ListBox2 (the list of keywords) contains WORD, it makes the text color blue. Now that worked fine. But I also wanted to clear WORD when these keys are pressed: <, =, "", and backspace
What I do in the ELSE section is simply try to filter out characters. Obviously, the code is nowhere close to done there, as I am attempting to use ASC, but don't know the keycodes for letters (any help here?). When I type SHIFT + <, the Chr(e.KeyCode) is this little cross sign. I don't want that there...I just want letters.
Here's my question: How can I get ONLY letters, no weird signs, no backspaces, just the letters in the word?
Code:
If e.KeyCode = Keys.Enter Then
Try
Dim text As String = RichTextBox1.Lines(RichTextBox1.GetLineFromCharIndex(RichTextBox1.SelectionStart))
Dim keyword As String = text.Substring(0, 5)
If keyword.StartsWith("<li>") Then
RichTextBox1.SelectionStart = RichTextBox1.GetFirstCharIndexOfCurrentLine()
RichTextBox1.SelectionStart = RichTextBox1.SelectionStart + text.Length
RichTextBox1.SelectedText = vbNewLine & "<li>"
e.SuppressKeyPress = True
End If
Catch ex As Exception
End Try
ElseIf e.KeyCode = Keys.Space Then
MsgBox(Word)
With Word
If ListBox2.Items.Contains(Word) = True Then
RichTextBox1.SelectionStart = RichTextBox1.SelectionStart - Word.Length
RichTextBox1.SelectionLength = Word.Length
RichTextBox1.SelectionColor = Color.Blue
RichTextBox1.SelectionStart = RichTextBox1.SelectionStart + Word.Length
RichTextBox1.SelectionLength = 0
RichTextBox1.SelectionColor = Color.Black
Else
RichTextBox1.SelectionColor = Color.Black
End If
Word = String.Empty
End With
ElseIf e.KeyCode = 190 Then
With Word
Try
If ListBox2.Items.Contains(Word) = True Then
RichTextBox1.SelectionStart = RichTextBox1.SelectionStart - Word.Length
RichTextBox1.SelectionLength = Word.Length
RichTextBox1.SelectionColor = Color.Blue
RichTextBox1.SelectionStart = RichTextBox1.SelectionStart + Word.Length
RichTextBox1.SelectionLength = 0
RichTextBox1.SelectionColor = Color.Black
Else
RichTextBox1.SelectionColor = Color.Black
End If
Word = String.Empty
Catch ex As Exception
If e.KeyCode = 16 Then
Word = String.Empty
End If
End Try
End With
Else
If Asc(Chr(e.KeyCode)) > -1 And Asc(Chr(e.KeyCode)) < 100 Then
Word = Word & Chr(e.KeyCode).ToString.ToLower
End If
End IfWhat I do in the ELSE section is simply try to filter out characters. Obviously, the code is nowhere close to done there, as I am attempting to use ASC, but don't know the keycodes for letters (any help here?). When I type SHIFT + <, the Chr(e.KeyCode) is this little cross sign. I don't want that there...I just want letters.
Here's my question: How can I get ONLY letters, no weird signs, no backspaces, just the letters in the word?