static void _ParseIncludes(LexContext pc, IList <string> result)
{
pc.TrySkipCCommentsAndWhiteSpace();
while ('@' == pc.Current)
{
pc.Advance();
var s = XbnfNode.ParseIdentifier(pc);
if ("include" == s)
{
pc.TrySkipCCommentsAndWhiteSpace();
var lit = XbnfExpression.Parse(pc) as XbnfLiteralExpression;
if (!result.Contains(lit.Value))
{
result.Add(lit.Value);
}
pc.TryReadCCommentsAndWhitespace();
pc.Advance();
pc.TryReadCCommentsAndWhitespace();
}
else
{
while (-1 != pc.Current && ';' != pc.Current)
{
pc.Advance();
}
if (';' == pc.Current)
{
pc.Advance();
}
pc.TrySkipCCommentsAndWhiteSpace();
}
}
}
public override string ToString()
{
if (null == Document)
{
return("");
}
if (string.IsNullOrEmpty(Document.FileOrUrl))
{
return("@import <<in-memory>>;");
}
return("@import \"" + XbnfNode.Escape(Document.FileOrUrl) + "\";");
}
public string ToString(string fmt)
{
var sb = new StringBuilder();
for (int ic = Includes.Count, i = 0; i < ic; ++i)
{
sb.Append("@include ");
sb.Append("\"" + XbnfNode.Escape(Includes[i].Document.FileOrUrl) + "\"");
sb.AppendLine(";");
}
var oc = Options.Count;
if (0 < oc)
{
sb.Append("@options ");
for (var i = 0; i < oc; ++i)
{
if (0 != i)
{
sb.Append(", ");
}
sb.Append(Options[i]);
}
sb.AppendLine(";");
}
if ("gnc" == fmt)
{
for (int ic = Productions.Count, i = 0; i < ic; ++i)
{
sb.AppendLine(Productions[i].ToString("pnc"));
}
}
else if ("xc" == fmt)
{
for (int ic = Productions.Count, i = 0; i < ic; ++i)
{
sb.AppendLine(Productions[i].ToString("xc"));
}
}
else
{
for (int ic = Productions.Count, i = 0; i < ic; ++i)
{
sb.AppendLine(Productions[i].ToString());
}
}
return(sb.ToString());
}
static string _ToRegex(XbnfDocument d, XbnfExpression e, bool first, bool gplex = false)
{
var le = e as XbnfLiteralExpression;
if (null != le)
{
var s = _EscapeLiteral(XbnfNode.Escape(le.Value), !gplex);
if (gplex)
{
s = string.Concat("\"", s, "\"");
}
return(s);
}
var rxe = e as XbnfRegexExpression;
if (null != rxe)
{
var r = rxe.Value;
if (gplex)
{
r = r.Replace("\"", "\\\"");
}
return(first ? r : string.Concat("(", r, ")"));
}
var rfe = e as XbnfRefExpression;
if (null != rfe)
{
_ToRegex(d, d.Productions[rfe.Symbol].Expression, first, gplex);
}
var re = e as XbnfRepeatExpression;
if (null != re)
{
if (re.IsOptional)
{
return(string.Concat("(", _ToRegex(d, re.Expression, true, gplex), ")*"));
}
else
{
return(string.Concat("(", _ToRegex(d, re.Expression, true, gplex), ")+"));
}
}
var oe = e as XbnfOrExpression;
if (null != oe)
{
if (!first)
{
return(string.Concat("(", _ToRegex(d, oe.Left, false, gplex), "|", _ToRegex(d, oe.Right, false, gplex), ")"));
}
else
{
return(string.Concat(_ToRegex(d, oe.Left, false, gplex), "|", _ToRegex(d, oe.Right, false, gplex)));
}
}
var oc = e as XbnfConcatExpression;
if (null != oc)
{
return(string.Concat(_ToRegex(d, oc.Left, false, gplex), _ToRegex(d, oc.Right, false, gplex)));
}
var ope = e as XbnfOptionalExpression;
if (null != ope)
{
return(string.Concat("(", _ToRegex(d, ope.Expression, true, gplex), ")?"));
}
return("");
}
internal static XbnfDocument Parse(LexContext pc)
{
var result = new XbnfDocument();
if (!string.IsNullOrEmpty(pc.FileOrUrl))
{
result.SetFilename(pc.FileOrUrl);
}
while (-1 != pc.Current && '}' != pc.Current)
{
pc.TrySkipCCommentsAndWhiteSpace();
while ('@' == pc.Current) // directives
{
pc.Advance();
var l = pc.Line;
var c = pc.Column;
var p = pc.Position;
var str = XbnfNode.ParseIdentifier(pc);
if (0 == string.Compare("include", str, StringComparison.InvariantCulture))
{
result.Includes.Add(_ParseIncludePart(result, pc));
}
else if (0 == string.Compare("options", str, StringComparison.InvariantCulture))
{
if (0 < result.Options.Count)
{
throw new ExpectingException("Duplicate directive \"options\" specified", l, c, p, pc.FileOrUrl);
}
while (-1 != pc.Current && ';' != pc.Current)
{
l = pc.Line;
c = pc.Column;
p = pc.Position;
var opt = XbnfOption.Parse(pc);
opt.SetLocation(l, c, p);
result.Options.Add(opt);
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting(';', ',');
if (',' == pc.Current)
{
pc.Advance();
}
}
pc.Expecting(';');
pc.Advance();
if (0 == result.Options.Count)
{
throw new ExpectingException("Expection options but \"options\" directive was empty", l, c, p, pc.FileOrUrl);
}
}
else
{
throw new ExpectingException("Expecting \"include\" or \"options\"", l, c, p, pc.FileOrUrl, "include", "options");
}
pc.TrySkipCCommentsAndWhiteSpace();
}
if (pc.Current == '{')
{
pc.Advance();
var l = pc.Line;
var c = pc.Column;
var p = pc.Position;
var s = ReadCode(pc);
pc.Expecting('}');
pc.Advance();
var code = new XbnfCode(s);
code.SetLocation(l, c, p);
result.Code.Add(code);
}
else if (-1 != pc.Current)
{
if ('@' == pc.Current)
{
throw new ExpectingException("Expecting productions. Includes and options must be specified before any productions", pc.Line, pc.Column, pc.Position, pc.FileOrUrl, "Production");
}
result.Productions.Add(XbnfProduction.Parse(pc));
}
else // end of input
{
return(result);
}
// have to do this so trailing whitespace
// doesn't get read as a production
pc.TryReadCCommentsAndWhitespace();
}
return(result);
}
