private IExpr ParseAdditiveExpression()
{
IExpr expr = ParseMultiplicativeExpression();
while (mHeadToken == TokenType.Plus ||
mHeadToken == TokenType.Minus)
{
SourceInfo info = mLexer.GetSourceInfo();
ValueSymbol selector = null;
switch (mHeadToken)
{
case TokenType.Plus:
selector = ValueSymbol.Intern("+");
break;
case TokenType.Minus:
selector = ValueSymbol.Intern("-");
break;
}
LookAhead();
IList<IExpr> argExprs = new List<IExpr> {
ParseMultiplicativeExpression()
};
expr = new ExprSend(expr, selector, argExprs, info);
}
return expr;
}
private IExpr ParseSubscriptionAssignment(ExprSend sendExpr)
{
SourceInfo info = mLexer.GetSourceInfo();
List<IExpr> argExprs = new List<IExpr>();
argExprs.AddRange(sendExpr.ArgExprs);
LookAhead();
argExprs.Add(ParseExpression());
return new ExprSend(
sendExpr.RecvExpr,
ValueSymbol.Intern("[]="),
argExprs,
info
);
}
private IExpr ParseEqualityExpression()
{
IExpr expr = ParseRelationalExpression();
if (mHeadToken == TokenType.DoubleEqual)
{
SourceInfo info = mLexer.GetSourceInfo();
ValueSymbol selector = null;
switch (mHeadToken)
{
case TokenType.DoubleEqual:
selector = ValueSymbol.Intern("==");
break;
}
LookAhead();
IList<IExpr> argExprs = new List<IExpr> {
ParseRelationalExpression()
};
expr = new ExprSend(expr, selector, argExprs, info);
}
return expr;
}
