| static private GetBinaryBinder ( TokenType tokenType ) : System.Runtime.CompilerServices.CallSiteBinder | ||
| tokenType | TokenType | |
| return | System.Runtime.CompilerServices.CallSiteBinder | |
private static Expression GetCompareAST(IList <ParseNode> nodes, int start, Expression context, Expression chain = null)
{
//Rewrite chained compare expressions to chained AND expressions, e.g. 5>4>3> --> 5>4 AND 4>3
Debug.Assert(nodes.Count >= 3 && nodes.Count % 2 == 1);
Expression result;
if (start == 0)
{
result = chain;
}
else
{
var link = Expression.Dynamic(DLRUtil.GetBinaryBinder(nodes[start - 1].Token.Type),
typeof(object),
nodes[start - 2].GetAST(context),
nodes[start].GetAST(context));
chain = chain != null
? Expression.Dynamic(DLRUtil.GetBinaryBinder(TokenType.AND),
typeof(object),
link,
chain)
: link;
result = GetCompareAST(nodes, start - 2, context, chain);
}
return(result);
}
private static Expression GetBinaryAST(IList <ParseNode> nodes, int start, Expression context)
{
//chain from left to right
//2 + 3 + 4 is calculated as (2+3)+4, 15%12%5 as (15%12)%5
Debug.Assert(nodes.Count >= 3 && nodes.Count % 2 == 1);
return(start == 0
? nodes[start].GetAST(context)
: Expression.Dynamic(DLRUtil.GetBinaryBinder(nodes[start - 1].Token.Type),
typeof(object),
GetBinaryAST(nodes, start - 2, context),
nodes[start].GetAST(context)));
}
private static Expression GetBinaryAST(IList <ParseNode> nodes, int start, Expression context)
{
//chain from left to right
//2 + 3 + 4 is calculated as (2+3)+4, 15%12%5 as (15%12)%5
Debug.Assert(nodes.Count >= 3 && nodes.Count % 2 == 1);
Expression result;
if (start == 0)
{
result = nodes[start].GetAST(context);
}
else
{
var tokenType = nodes[start - 1].Token.Type;
var left = GetBinaryAST(nodes, start - 2, context);
var right = nodes[start].GetAST(context);
if (tokenType == TokenType.AND)
{
result = Expression.AndAlso(
Expression.Convert(left, typeof(bool)),
Expression.Convert(right, typeof(bool)));
}
else if (tokenType == TokenType.OR)
{
result = Expression.OrElse(
Expression.Convert(left, typeof(bool)),
Expression.Convert(right, typeof(bool)));
}
else
{
result = Expression.Dynamic(
DLRUtil.GetBinaryBinder(tokenType),
typeof(object),
left,
right);
}
}
return(result);
}
