public virtual void OnStyleNeeded(StyleNeededEventArgs e)
{
if (StyleNeeded != null)
{
StyleNeeded(this, e);
}
}
protected virtual void DoHighlighting()
{
if (parser == null)
{
return;
}
//parse text
ParseTree tree;
try
{
tree = parser.Parse(Text);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message); //oops...
return;
}
//highlight errors
if (tree.Status == ParseTreeStatus.Error)
{
ClearStyle(GetStyleIndexMask(new[] { WavyStyle }));
foreach (var msg in tree.ParserMessages)
{
var loc = msg.Location;
var place = new Place(loc.Column, loc.Line);
var r = new Range(this, place, place);
var f = r.GetFragment(@"[\S]");
f.SetStyle(WavyStyle);
}
return;
}
//highlight syntax
ClearStyle(StyleIndex.All);
foreach (var t in tree.Tokens)
{
var arg = new StyleNeededEventArgs(t);
OnStyleNeeded(arg);
if (arg.Cancel)
{
continue;
}
if (arg.Style != null)
{
GetTokenRange(t).SetStyle(arg.Style);
continue;
}
switch (t.Terminal.GetType().Name)
{
case "KeyTerm":
if ((t.Terminal.Flags & TermFlags.IsKeyword) != 0) //keywords are highlighted only
{
GetTokenRange(t).SetStyle(SyntaxHighlighter.KeywordStyle);
}
break;
case "NumberLiteral":
GetTokenRange(t).SetStyle(SyntaxHighlighter.NumberStyle);
break;
case "StringLiteral":
GetTokenRange(t).SetStyle(SyntaxHighlighter.StringStyle);
break;
case "CommentTerminal":
GetTokenRange(t).SetStyle(SyntaxHighlighter.CommentStyle);
break;
}
}
}
