private Type GetExpressionType <T>(TokenSet set, ParameterExpression parameter, ICollection <ParameterExpression> lambdaParameters)
{
if (set == null)
{
return(null);
}
if (Regex.IsMatch(set.Left, @"^\(.*\)$") && set.Operation.IsCombinationOperation())
{
return(null);
}
if (set.Left.IsFunction())
{
var functionName = set.Left.GetFunctionName();
if (!string.IsNullOrWhiteSpace(functionName))
{
return(functionName.GetFunctionType());
}
}
var property = GetPropertyExpression <T>(set.Left, parameter, lambdaParameters) ?? GetPropertyExpression <T>(set.Right, parameter, lambdaParameters);
if (property != null)
{
return(property.Type);
}
var type = GetExpressionType <T>(set.Left.GetArithmeticToken(), parameter, lambdaParameters);
return(type ?? GetExpressionType <T>(set.Right.GetArithmeticToken(), parameter, lambdaParameters));
}
public static ICollection <TokenSet> GetTokens(this string expression)
{
var tokens = new Collection <TokenSet>();
if (string.IsNullOrWhiteSpace(expression))
{
return(tokens);
}
var cleanMatch = expression.EnclosedMatch();
if (cleanMatch.Success)
{
var match = cleanMatch.Groups[1].Value;
if (!HasOrphanedOpenParenthesis(match))
{
expression = match;
}
}
if (expression.IsImpliedBoolean())
{
return(tokens);
}
var blocks = GetBlocks(expression);
var openGroups = 0;
var startExpression = 0;
var currentTokens = new TokenSet();
for (var i = 0; i < blocks.Count; i++)
{
var netEnclosed = blocks[i].Count(c => c == '(') - blocks[i].Count(c => c == ')');
openGroups += netEnclosed;
if (openGroups == 0)
{
if (blocks[i].IsOperation())
{
var expression1 = startExpression;
if (string.IsNullOrWhiteSpace(currentTokens.Left))
{
var i1 = i;
Func <string, int, bool> leftPredicate = (x, j) => j >= expression1 && j < i1;
currentTokens.Left = string.Join(" ", blocks.Where(leftPredicate));
currentTokens.Operation = blocks[i];
startExpression = i + 1;
if (blocks[i].IsCombinationOperation())
{
currentTokens.Right = string.Join(" ", blocks.Where((x, j) => j > i));
tokens.Add(currentTokens);
return(tokens);
}
}
else
{
var i2 = i;
Func <string, int, bool> rightPredicate = (x, j) => j >= expression1 && j < i2;
currentTokens.Right = string.Join(" ", blocks.Where(rightPredicate));
tokens.Add(currentTokens);
startExpression = i + 1;
currentTokens = new TokenSet();
if (blocks[i].IsCombinationOperation())
{
tokens.Add(new TokenSet {
Operation = blocks[i].ToLowerInvariant()
});
}
}
}
}
}
var remainingToken = string.Join(" ", blocks.Where((x, j) => j >= startExpression));
if (!string.IsNullOrWhiteSpace(currentTokens.Left))
{
currentTokens.Right = remainingToken;
tokens.Add(currentTokens);
}
else if (remainingToken.IsEnclosed())
{
currentTokens.Left = remainingToken;
tokens.Add(currentTokens);
}
else if (tokens.Count > 0)
{
currentTokens.Left = remainingToken;
tokens.Add(currentTokens);
}
return(tokens);
}