public IList <EbnfMessage> DeclareImplicitTerminals()
{
var result = new List <EbnfMessage>();
var terms = new HashSet <EbnfExpression>();
var done = new HashSet <EbnfExpression>();
foreach (var prod in Productions)
{
_VisitFetchTerminals(prod.Value.Expression, terms);
if (prod.Value.Expression.IsTerminal)
{
done.Add(prod.Value.Expression);
}
}
foreach (var term in terms)
{
if (!done.Contains(term))
{
var prod = new EbnfProduction();
prod.Expression = ((ICloneable)term).Clone() as EbnfExpression;
var newId = _GetImplicitTermId();
Productions.Add(newId, prod);
result.Add(new EbnfMessage(EbnfErrorLevel.Message, -1, "Terminal was implicitly declared.", term.Line, term.Column, term.Position));
}
}
return(result);
}
static void _ReadProduction(EbnfDocument doc, EbnfParser parser)
{
parser.Read();
var id = parser.Value;
var prod = new EbnfProduction();
parser.Read();
if (EbnfParser.lt == parser.SymbolId)
{
parser.Read();
_ReadAttributes(prod.Attributes, parser);
parser.Read();
}
parser.Read();
prod.Expression = _ReadExpressions(parser);
}
static void _ParseAttribute(EbnfDocument doc, string id, EbnfProduction prod, ParseContext pc)
{
pc.TrySkipCCommentsAndWhiteSpace();
var attrid = _ParseIdentifier(pc);
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting('=', '>', ',');
object val = true;
if ('=' == pc.Current)
{
pc.Advance();
val = pc.ParseJsonValue();
}
pc.Expecting(',', '>');
prod.Attributes[attrid] = val;
pc.TrySkipCCommentsAndWhiteSpace();
}
static void _ParseAttributes(EbnfDocument doc, string id, EbnfProduction prod, ParseContext pc)
{
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting('<');
pc.Advance();
while (-1 != pc.Current && '>' != pc.Current)
{
_ParseAttribute(doc, id, prod, pc);
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting(',', '>');
if (',' == pc.Current)
{
pc.Advance();
}
}
pc.Expecting('>');
pc.Advance();
pc.TrySkipCCommentsAndWhiteSpace();
}
static void _ParseProduction(EbnfDocument doc, ParseContext pc)
{
pc.TrySkipCCommentsAndWhiteSpace();
var line = pc.Line;
var column = pc.Column;
var position = pc.Position;
var id = _ParseIdentifier(pc);
pc.TrySkipCCommentsAndWhiteSpace();
var prod = doc.Productions.TryGetValue(id, null);
if (null == prod)
{
prod = new EbnfProduction();
doc.Productions.Add(id, prod);
}
if ('<' == pc.Current)
{
_ParseAttributes(doc, id, prod, pc);
pc.TrySkipCCommentsAndWhiteSpace();
}
pc.Expecting('=');
pc.Advance();
pc.Expecting();
var expr = _ParseExpression(doc, pc);
pc.TrySkipCCommentsAndWhiteSpace();
pc.Expecting(';');
pc.Advance();
pc.TrySkipCCommentsAndWhiteSpace();
// transform this into an OrExpression with the previous
if (null != prod.Expression)
{
prod.Expression = new EbnfOrExpression(prod.Expression, expr);
}
else
{
prod.Expression = expr;
}
prod.SetPositionInfo(line, column, position);
}