private InputElement MakeInputElement(InputElementTag tag)
{
var res = new InputElement
(new Location(fileName, startPos, startLine, startColumn, currentPos, currentLine, currentColumn),
tag,
sb.ToString());
sb = new StringBuilder();
startPos = currentPos;
startLine = currentLine;
startColumn = currentColumn;
if (IsSignificantTag(tag))
{
lastSignificantTag = tag;
wasInExpressionContext = false;
}
return res;
}
private void PopClosePunctuator(InputElement closeElem)
{
if (openPunctuators.Count == 0)
{
var openStr = default(string);
switch (closeElem.Tag)
{
case InputElementTag.RParen:
openStr = "(";
break;
case InputElementTag.RBrace:
openStr = "{";
break;
case InputElementTag.RSquare:
openStr = "[";
break;
default:
throw new InvalidOperationException("not a bracket");
}
throw MsgError("punctuator", String.Format("no opening '{0}' to match closing '{1}'", openStr, closeElem.Value));
}
else
{
var openElem = openPunctuators[openPunctuators.Count - 1];
openPunctuators.RemoveAt(openPunctuators.Count - 1);
if (closeElem.Tag == InputElementTag.RParen && openElem.Tag == InputElementTag.LParen ||
closeElem.Tag == InputElementTag.RBrace && openElem.Tag == InputElementTag.LBrace ||
closeElem.Tag == InputElementTag.RSquare && openElem.Tag == InputElementTag.LSquare)
return;
throw MsgError
("punctuator", String.Format("closing '{0}' does not match opening '{1}' at ({2}, {3})", closeElem.Value, openElem.Value, openElem.Loc.StartLine, openElem.Loc.StartColumn));
}
}
private void PushOpenPunctuator(InputElement openElem)
{
openPunctuators.Add(openElem);
}
private void Regurgitate(InputElement ie)
{
lookahead.Push(ie);
}
public Parser(Lexer lexer)
{
this.lexer = lexer;
lookahead = new Seq<InputElement>();
lastLineTerminator = null;
pendingComments = null;
pendingCommentsLoc = null;
}
private void PushOpenPunctuator(InputElement openElem)
{
openPunctuators.Add(openElem);
}