static Object.Object evalHashLiteral(ast.HashLiteral node, Object.Environment env)
{
Dictionary <Object.HashKey, Object.HashPair> pairs = new Dictionary <Object.HashKey, Object.HashPair>();
foreach (KeyValuePair <ast.Expression, ast.Expression> _node_pair in node.Pairs)
{
Object.Object key = Eval(_node_pair.Key, env);
if (isError(key))
{
return(key);
}
if (!(key is Object.Hashable))
{
return(newError("unusable as hash key: {0}", key.Type()));
}
Object.Hashable hashKey = (Object.Hashable)key;
Object.Object value = Eval(_node_pair.Value, env);
if (isError(value))
{
return(value);
}
Object.HashKey hashed = hashKey.HashKey();
pairs.Add(hashed, new Object.HashPair {
Key = key, Value = value
});
}
return(new Object.Hash {
Pairs = pairs
});
}
static Object.Object buildHash(int startIndex, int endIndex, out error _err)
{
Dictionary <Object.HashKey, Object.HashPair> hashedPairs = new Dictionary <Object.HashKey, Object.HashPair>();
for (int i = startIndex; i < endIndex; i += 2)
{
Object.Object key = vm.stack[i];
Object.Object value = vm.stack[i + 1];
Object.HashPair pair = new Object.HashPair {
Key = key, Value = value
};
if (!(key is Object.Hashable))
{
_err = string.Format("unusable as hash key: {0}", key.Type());
return(null);
}
Object.Hashable hashKey = (Object.Hashable)key;
hashedPairs.Add(hashKey.HashKey(), pair);
}
_err = null;
return(new Object.Hash {
Pairs = hashedPairs
});
}
static Object.Object evalHashIndexExpression(Object.Object hash, Object.Object index)
{
Object.Hash hashObject = (Object.Hash)hash;
if (!(index is Object.Hashable))
{
return(newError("unusable as hash key: {0}", index.Type()));
}
Object.Hashable key = (Object.Hashable)index;
Object.HashPair pair;
if (!hashObject.Pairs.TryGetValue(key.HashKey(), out pair))
{
return(NULL);
}
return(pair.Value);
}
static error executeHashIndex(Object.Object hash, Object.Object index)
{
Object.Hash hashObject = (Object.Hash)hash;
if (!(index is Object.Hashable))
{
return(string.Format("unusable as hash key: {0}", index.Type()));
}
Object.Hashable key = (Object.Hashable)index;
Object.HashPair pair;
if (!hashObject.Pairs.TryGetValue(key.HashKey(), out pair))
{
return(push(Null));
}
return(push(pair.Value));
}
