private void RenderTimer_Tick(object sender, EventArgs e)
{
RenderTimer.Enabled = false;
CharFA <string> fa = null;
try
{
var ast = RegexExpression.Parse(Regex.Text);
fa = ast.ToFA("Accept");
}
catch (Exception ex)
{
Status.Text = string.Format("Error Parsing Regex: {0}", ex.Message);
}
if (null != fa)
{
// mark our states for displaying the DFA later
foreach (var ffa in fa.FillClosure())
{
ffa.Tag = ffa;
}
try
{
var kvp = fa.Lex(Input.Text.GetEnumerator(), "#ERROR");
if (kvp.Value.Length != Input.Text.Length)
{
Status.Text = string.Format("Input error at {0}", kvp.Value.Length);
}
else
{
Status.Text = "Successfully Lexed.";
}
}
catch (Exception eex)
{
Status.Text = string.Format("Input error: {0}", eex.Message);
}
var options = new CharFA <string> .DotGraphOptions();
options.DebugString = Input.Text;
var dfa = fa.ToDfa();
dfa.TrimDuplicates();
try
{
using (var stm = fa.RenderToStream("jpg", false, options))
NfaGraph.Image = Image.FromStream(stm);
} catch
{
}
options.StatePrefix = @"Q";
options.DebugSourceNfa = fa;
try
{
using (var stm = dfa.RenderToStream("jpg", false, options))
DfaGraph.Image = Image.FromStream(stm);
}
catch { }
}
}
public LexRule(string left, string right)
{
Left = left;
Right = RegexExpression.Parse(right);
}
internal static LexDocument Parse(ParseContext pc)
{
var result = new LexDocument();
while (-1 != pc.Current)
{
var line = pc.Line;
var column = pc.Column;
var position = pc.Position;
LexNode.SkipCommentsAndWhitespace(pc);
while ('\n' == pc.Current)
{
pc.Advance();
LexNode.SkipCommentsAndWhitespace(pc);
}
var id = LexNode.ParseIdentifier(pc);
if (string.IsNullOrEmpty(id))
{
pc.Advance();
LexNode.SkipCommentsAndWhitespace(pc);
continue;
}
LexNode.SkipCommentsAndWhitespace(pc);
pc.Expecting(':', '-', '=');
if (':' == pc.Current) // attribute set
{
pc.Advance();
var d = new LexAttributeList();
while (-1 != pc.Current && '\n' != pc.Current)
{
var attr = LexAttribute.Parse(pc);
d.Add(attr);
LexNode.SkipCommentsAndWhitespace(pc);
pc.Expecting('\n', ',', -1);
if (',' == pc.Current)
{
pc.Advance();
}
}
result.AttributeSets.Add(id, d);
LexNode.SkipCommentsAndWhitespace(pc);
}
else if ('=' == pc.Current)
{
pc.Advance();
LexNode.SkipCommentsAndWhitespace(pc);
pc.Expecting('\'');
pc.Advance();
var l = pc.CaptureBuffer.Length;
pc.TryReadUntil('\'', '\\', false);
pc.Expecting('\'');
pc.Advance();
var rx = pc.GetCapture(l);
// make sure to capture the line numbers properly:
var rpc = ParseContext.Create(rx);
rpc.EnsureStarted();
rpc.SetLocation(pc.Line, pc.Column, pc.Position);
var rule = new LexRule(id, RegexExpression.Parse(rpc));
rule.SetLocation(line, column, position);
result.Rules.Add(rule);
}
else if ('-' == pc.Current)
{
pc.TrySkipUntil('\n', true);
}
LexNode.SkipCommentsAndWhitespace(pc);
if ('\n' == pc.Current)
{
pc.Advance();
}
}
return(result);
}
