static void Rule()
{
Expect(1);
Node n;
Symbol s = Symbol.Find(t.val); //look if already known
if (s == null)
{
n = new Node(new Symbol(Node.nt, t.val));
}
else
{
if (s.typ == Node.nt)
{
String message = "ERROR: Nonterminal symbol " + t.val + " has been defined multiple times.";
EbnfForm.WriteLine(message);
n = new Node(new Symbol(0, "BUG"));
}
else //if only considered as terminal symbol until now
{
s.typ = Node.nt;
Symbol.terminalToNt(s.name);
Symbol.terminalToNt(s.name);
Node.terminalToNt(s.name);
n = Node.Find(s.name);
}
}
Expect(4);
Expr(out n.sym.graph);
Expect(5);
Graph.Finish(n.sym.graph);
}
private void menuItemHelpLink_Click(object sender, System.EventArgs e)
{
try {
System.Diagnostics.Process.Start("manual.html");
} catch {
EbnfForm.WriteLine("Help named manual.html was not found!");
}
}
private void SwitchToRule(Symbol s)
{
currentSymbol = s;
drawGrammar();
EbnfForm.WriteLine("Switched to rule: " + s.name + ".");
foreach (MenuItem mi in menuItemRules.MenuItems)
{
mi.Checked = false;
if (mi.Text == s.name)
{
mi.Checked = true;
}
}
}
static Token pt; // current peek token
public static void Init(string fileName)
{
FileStream s = null;
try {
s = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
Init(s);
} catch (IOException) {
EbnfForm.WriteLine("--- Cannot open file " + fileName);
//System.Environment.Exit(1);
} finally {
if (s != null)
{
s.Close();
}
}
}
private void SetCurrentSymbol(object sender, System.EventArgs e)
{
rulehistory.Clear();
foreach (MenuItem mi in menuItemRules.MenuItems)
{
mi.Checked = false;
}
MenuItem temp = (MenuItem)sender;
temp.Checked = true;
menuItemSave.Enabled = true;
menuItemCopy.Enabled = true;
currentSymbol = Symbol.Find(temp.Text);
rulehistory.Push(currentSymbol);
this.drawGrammar();
EbnfForm.WriteLine("Switched to rule: " + currentSymbol.name + ".");
}
public static string errMsgFormat = "-- line {0} col {1}: {2}"; // 0=line, 1=column, 2=text
public static void SynErr(int line, int col, int n)
{
string s;
switch (n)
{
case 0: s = "EOF expected"; break;
case 1: s = "ident expected"; break;
case 2: s = "terminal expected"; break;
case 3: s = "wrap expected"; break;
case 4: s = "\"=\" expected"; break;
case 5: s = "\".\" expected"; break;
case 6: s = "\"|\" expected"; break;
case 7: s = "\"(\" expected"; break;
case 8: s = "\")\" expected"; break;
case 9: s = "\"[\" expected"; break;
case 10: s = "\"]\" expected"; break;
case 11: s = "\"{\" expected"; break;
case 12: s = "\"}\" expected"; break;
case 13: s = "??? expected"; break;
case 14: s = "invalid Sym"; break;
default: s = "error " + n; break;
}
Console.WriteLine(Errors.errMsgFormat, line, col, s);
EbnfForm.WriteLine("ERROR: Line: " + line + " Col: " + col + ": " + s);
count++;
}
// save drawing in bitmap DrawArea as a jpeg file
private void menuItemSave_Click(object sender, System.EventArgs e)
{
ImageFormat format = ImageFormat.Gif;
SaveFileDialog sfd = new SaveFileDialog();
if (currentSymbol != null)
{
sfd.FileName = currentSymbol.name;
}
sfd.Filter = "GIF Files(*.GIF)|*.GIF|Windows Metafile (*.EMF)|*.EMF";
if (sfd.ShowDialog() == DialogResult.OK)
{
if (sfd.FileName.EndsWith(".EMF"))
{
saveEmf(sfd.FileName);
}
else
{
DrawArea.Save(sfd.FileName, format);
}
EbnfForm.WriteLine("Rule " + currentSymbol.name + " saved to " + sfd.FileName + ".");
}
sfd.Dispose();
}
private void btnEbnf_Click(object sender, EventArgs e)
{
var form = new EbnfForm();
form.Show();
}
private void LoadGrammar(String path)
{
//put shortcut in menu to top position
foreach (MenuItem mi in menuItemFile.MenuItems)
{
mi.Checked = false;
if (mi.Text == path)
{
mi.Index = 6;
mi.Checked = true;
break;
}
}
// Clear the existing nodes and symbols
Symbol.nonterminals = new ArrayList();
Symbol.terminals = new ArrayList();
Node.nodes = new ArrayList();
currentSymbol = null;
menuItemRules.MenuItems.Clear();
rulehistory.Clear();
Scanner.Init(path);
Parser.Parse();
Node.Optimize();
int i;
bool insert;
foreach (Symbol s in Symbol.nonterminals)
{
MenuItem m = new MenuItem(s.name);
i = 0;
insert = false;
foreach (MenuItem mi in menuItemRules.MenuItems)
{
if (m.Text.CompareTo(mi.Text) > 0)
{
i++;
}
else
{
menuItemRules.MenuItems.Add(i, m);
insert = true;
break;
}
}
if (i > 0 && !insert)
{
menuItemRules.MenuItems.Add(i, m);
}
if (menuItemRules.MenuItems.Count == 0)
{
menuItemRules.MenuItems.Add(m);
}
m.Click += new System.EventHandler(this.SetCurrentSymbol);
}
menuItemRules.Enabled = true;
this.drawGrammar();
EbnfForm.WriteLine("New grammar loaded from file " + path + ".");
}
// copy current symbol picture to clipboard
private void menuItemCopy_Click(object sender, System.EventArgs e)
{
EbnfForm.WriteLine("Rule " + currentSymbol.name + " copied to clipboard.");
Clipboard.SetDataObject(DrawArea, true);
}
