// additive_expression: multiplicative_expression ( <add_op> multiplicative_expression )*
private Expression ParseAdditiveExpression()
{
Expression ret = ParseMultiplicativeExpression();
if (ret == null)
return ret;
while (IsAdditiveToken(PeekToken()))
{
Token t = NextToken();
var start = ret.StartIndex;
ret = new BinaryExpression(t.Kind, ret, ParseMultiplicativeExpression());
ret.SetLoc(_globalParent, start, GetEnd());
}
return ret;
}
// equality_expression: relational_expression ( <eq_op> relational_expression )*
private Expression ParseEqualityExpression()
{
Expression ret = ParseRelationalExpression();
if (ret == null)
return ret;
if (IsEqualityToken(PeekToken()))
{
Token t = NextToken();
var start = ret.StartIndex;
ret = new BinaryExpression(t.Kind, ret, ParseEqualityExpression());
ret.SetLoc(_globalParent, start, GetEnd());
}
return ret;
}
// logical_or_expression: logical_and_expression ( '||' logical_and_expression )*
private Expression ParseLogicalOrExpression()
{
Expression ret = ParseLogicalAndExpression();
if (ret == null)
return ret;
while (MaybeEat(TokenKind.LogicalOr))
{
var start = ret.StartIndex;
ret = new BinaryExpression(TokenKind.LogicalOr, ret, ParseLogicalAndExpression());
ret.SetLoc(_globalParent, start, GetEnd());
}
return ret;
}