internal static XbnfExpression Parse(ParseContext pc)
{
XbnfExpression current = null;
XbnfExpression e;
long position;
int line;
int column;
pc.TrySkipCCommentsAndWhiteSpace();
position = pc.Position; line = pc.Line; column = pc.Column;
while (-1 != pc.Current && ']' != pc.Current && ')' != pc.Current && '}' != pc.Current && ';' != pc.Current)
{
pc.TrySkipCCommentsAndWhiteSpace();
position = pc.Position; line = pc.Line; column = pc.Column;
switch (pc.Current)
{
case '|':
pc.Advance();
position = pc.Position; line = pc.Line; column = pc.Column;
current = new XbnfOrExpression(current, Parse(pc));
current.SetLocation(line, column, position);
break;
case '(':
pc.Advance();
position = pc.Position; line = pc.Line; column = pc.Column;
e = Parse(pc);
current.SetLocation(line, column, position);
pc.Expecting(')');
pc.Advance();
e.SetLocation(line, column, position);
if (null == current)
{
current = e;
}
else
{
current = new XbnfConcatExpression(current, e);
}
break;
case '[':
pc.Advance();
e = new XbnfOptionalExpression(Parse(pc));
e.SetLocation(line, column, position);
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting(']');
pc.Advance();
if (null == current)
{
current = e;
}
else
{
current = new XbnfConcatExpression(current, e);
}
break;
case '{':
pc.Advance();
e = new XbnfRepeatExpression(Parse(pc));
e.SetLocation(line, column, position);
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting('}');
pc.Advance();
if ('+' == pc.Current)
{
pc.Advance();
((XbnfRepeatExpression)e).IsOptional = false;
}
if (null == current)
{
current = e;
}
else
{
current = new XbnfConcatExpression(current, e);
}
break;
case '\"':
e = new XbnfLiteralExpression(pc.ParseJsonString());
if (null == current)
{
current = e;
}
else
{
current = new XbnfConcatExpression(current, e);
}
e.SetLocation(line, column, position);
break;
case '\'':
pc.Advance();
pc.ClearCapture();
pc.TryReadUntil('\'', '\\', false);
pc.Expecting('\'');
pc.Advance();
e = new XbnfRegexExpression(pc.GetCapture());
if (null == current)
{
current = e;
}
else
{
current = new XbnfConcatExpression(current, e);
}
e.SetLocation(line, column, position);
break;
case ';':
case ']':
case ')':
case '}':
return(current);
default:
e = new XbnfRefExpression(ParseIdentifier(pc));
if (null == current)
{
current = e;
}
else
{
current = new XbnfConcatExpression(current, e);
}
e.SetLocation(line, column, position);
break;
}
}
pc.TrySkipCCommentsAndWhiteSpace();
return(current);
}
static IList <IList <string> > _GetDysRepeat(XbnfDocument d, ICollection <string> syms, IDictionary <XbnfExpression, string> tmap, IDictionary <string, XbnfAttributeList> attrs, IList <KeyValuePair <string, IList <string> > > rules, XbnfProduction p, XbnfRepeatExpression re)
{
string sid = null;
var sr = re.Expression as XbnfRefExpression;
if (null != d && null != sr)
{
sid = string.Concat(sr.Symbol, "list");
}
if (string.IsNullOrEmpty(sid))
{
var cc = re.Expression as XbnfConcatExpression;
if (null != cc)
{
sr = cc.Right as XbnfRefExpression;
if (null != sr)
{
sid = string.Concat(sr.Symbol, "listtail");
}
}
}
if (string.IsNullOrEmpty(sid))
{
sid = "implicitlist";
}
var listId = sid;
var i = 2;
var ss = listId;
while (syms.Contains(ss))
{
ss = string.Concat(listId, i.ToString());
++i;
}
syms.Add(ss);
var attr = new XbnfAttribute("collapsed", true);
var attrlist = new XbnfAttributeList();
attrlist.Add(attr);
attrs.Add(listId, attrlist);
var expr =
new XbnfOrExpression(
new XbnfConcatExpression(
new XbnfRefExpression(listId), re.Expression), re.Expression);
foreach (var nt in _GetDysjunctions(d, syms, tmap, attrs, rules, p, expr))
{
var l = new List <string>();
var r = new KeyValuePair <string, IList <string> >(listId, l);
foreach (var s in nt)
{
if (1 < r.Value.Count && null == s)
{
continue;
}
r.Value.Add(s);
}
rules.Add(r);
}
if (!re.IsOptional)
{
return(new List <IList <string> >(new IList <string>[] { new List <string>(new string[] { listId }) }));
}
else
{
var res = new List <IList <string> >();
res.Add(new List <string>(new string[] { listId }));
res.Add(new List <string>());
return(res);
}
}