how to mark keywords in RichEditControl - devexpress

Question

I am using DevExpress RichEditControl in WindowsForm.
I am trying to let the user type sql statements.
How can I change the the color of the keyword to BLUE such as SELECT, FROM, ORDER BY hen the user types it?

Answer 1

Take a look at RichEditControl's Syntax Highlighting feature.
Related example: How to implement T-SQL language syntax highlighting by creating Syntax Highlight Tokens manually

Answer 2

You can implement it in two ways.
1.Implement simplified syntax highlighting for the T-SQL language by registering the ISyntaxHighlightService.
2.You can use the DevExpress.CodeParser library. It can be utilized to parse text in the following languages:C#,Visual Basic,JavaScript,HTML,XAML,CSS
This code is for the first one. you can highlight the keywords you want.
Code Example is available here https://www.devexpress.com/Support/Center/Example/Details/E4139.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
richEditControl1.ActiveViewType = DevExpress.XtraRichEdit.RichEditViewType.Draft;
richEditControl1.ReplaceService<ISyntaxHighlightService>(new CustomSyntaxHighlightService(richEditControl1.Document));
}
}
public class CustomSyntaxHighlightService : ISyntaxHighlightService
{
readonly Document document;
SyntaxHighlightProperties defaultSettings = new SyntaxHighlightProperties()
{
ForeColor = Color.Black
};
SyntaxHighlightProperties keywordSettings = new SyntaxHighlightProperties()
{
ForeColor = Color.Blue
};
SyntaxHighlightProperties stringSettings = new SyntaxHighlightProperties()
{
ForeColor = Color.Green
};
string[] keywords = new string[]
{
"INSERT", "SELECT", "CREATE", "TABLE", "USE", "IDENTITY", "ON", "OFF", "NOT", "NULL", "WITH", "SET" "ORDER BY"
};
public CustomSyntaxHighlightService(Document document)
{
this.document = document;
}
private List<SyntaxHighlightToken> ParseTokens()
{
List<SyntaxHighlightToken> tokens = new List<SyntaxHighlightToken>();
DocumentRange[] ranges = null;
ranges = document.FindAll("'", SearchOptions.None);
for (int i = 0; i < ranges.Length / 2; i++)
{
tokens.Add(new SyntaxHighlightToken(ranges[i * 2].Start.ToInt(),
ranges[i * 2 + 1].Start.ToInt() - ranges[i * 2].Start.ToInt() + 1, stringSettings));
}
for (int i = 0; i < keywords.Length; i++)
{
ranges = document.FindAll(keywords[i], SearchOptions.CaseSensitive | SearchOptions.WholeWord);
for (int j = 0; j < ranges.Length; j++)
{
if (!IsRangeInTokens(ranges[j], tokens))
tokens.Add(new SyntaxHighlightToken(ranges[j].Start.ToInt(), ranges[j].Length, keywordSettings));
}
}
tokens.Sort(new SyntaxHighlightTokenComparer());
AddPlainTextTokens(tokens);
return tokens;
}
private void AddPlainTextTokens(List<SyntaxHighlightToken> tokens)
{
int count = tokens.Count;
if (count == 0)
{
tokens.Add(new SyntaxHighlightToken(0, document.Range.End.ToInt(), defaultSettings));
return;
}
tokens.Insert(0, new SyntaxHighlightToken(0, tokens[0].Start, defaultSettings));
for (int i = 1; i < count; i++)
{
tokens.Insert(i * 2, new SyntaxHighlightToken(tokens[i * 2 - 1].End,tokens[i * 2].Start - tokens[i * 2 - 1].End, defaultSettings));
}
tokens.Add(new SyntaxHighlightToken(tokens[count * 2 - 1].End,document.Range.End.ToInt() - tokens[count * 2 - 1].End, defaultSettings));
}
private bool IsRangeInTokens(DocumentRange range, List<SyntaxHighlightToken> tokens)
{
for (int i = 0; i < tokens.Count; i++)
{
if (range.Start.ToInt() >= tokens[i].Start && range.End.ToInt() <= tokens[i].End)
return true;
}
return false;
}
public void ForceExecute()
{
Execute();
}
public void Execute()
{
document.ApplySyntaxHighlight(ParseTokens());
}
}
public class SyntaxHighlightTokenComparer : IComparer<SyntaxHighlightToken>
{
public int Compare(SyntaxHighlightToken x, SyntaxHighlightToken y)
{
return x.Start - y.Start;
}
}
If you want to implement using DevExpress.CodeParser library
here is the code sample https://www.devexpress.com/Support/Center/Example/Details/E2993