private static Expression ParseAddExpression(Scanner scanner)
{
Expression left = ParseMultiplyExpression(scanner);
while (true)
{
if (scanner.TryGetDelimiter("+"))
{
Expression right = ParseMultiplyExpression(scanner);
left = new AddExpression(left,right);
}
else if (scanner.TryGetDelimiter("-"))
{
Expression right = ParseMultiplyExpression(scanner);
left = new SubtractExpression(left,right);
}
else
{
return left;
}
}
}
private static Expression ParseAssigmentExpression(Scanner scanner)
{
Expression left = ParseLogicalOrExpression(scanner);
if (scanner.TryGetDelimiter("="))
{
Expression right = ParseAssigmentExpression(scanner);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("+="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new AddExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("-="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new SubtractExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("*="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new MultiplyExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("/="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new DivideExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("%="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new ModuloExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("<<="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new LeftShiftExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter(">>="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new RightShiftExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("&="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new BitwiseAndExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("^="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new BitwiseXorExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("|="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new BitwiseOrExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("&&="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new LogicalAndExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("^^="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new LogicalXorExpression(left,right);
return new AssignmentExpression(left,right);
}
else if (scanner.TryGetDelimiter("||="))
{
Expression right = ParseAssigmentExpression(scanner);
right = new LogicalOrExpression(left,right);
return new AssignmentExpression(left,right);
}
else
{
return left;
}
}