protected override void Push(IEnumerable <ParameterExpression> parameters)
{
var newScope = new Dictionary <ParameterExpression, ParameterExpression>();
foreach (var parameter in parameters)
{
var originalName = parameter.Name;
var newName = originalName;
if (string.IsNullOrWhiteSpace(originalName))
{
originalName = _unnamedParameterRenamePrefix;
newName = parameter.ToString();
}
// TODO: This can be optimized by providing prefix matching functionality in the syntax trie.
var i = 0;
while (_trie.Contains(newName))
{
newName = originalName + i++;
}
var newParameter = parameter;
if (newName != originalName)
{
newParameter = Expression.Parameter(parameter.Type, newName);
}
newScope[parameter] = newParameter;
_trie.Add(newName);
}
_environment.Push(newScope);
}
public Impl(string unnamedParameterRenamePrefix)
{
_unnamedParameterRenamePrefix = unnamedParameterRenamePrefix;
_trie = new SyntaxTrie();
_trie.Add(unnamedParameterRenamePrefix);
_environment = new Stack <Dictionary <ParameterExpression, ParameterExpression> >();
}