static void Set(ConcurrentDictionary<Type,ConcurrentDictionary<Type,LambdaInfo>> expressions, Type from, Type to, LambdaInfo expr)
{
ConcurrentDictionary<Type,LambdaInfo> dic;
if (!expressions.TryGetValue(from, out dic))
expressions[from] = dic = new ConcurrentDictionary<Type, LambdaInfo>();
dic[to] = expr;
}
public LambdaInfo Create(MappingSchema mappingSchema, Type from, Type to)
{
var ex = ConvertBuilder.GetConverter(mappingSchema, from, to);
var lm = ex.Item1.Compile();
var ret = new LambdaInfo(ex.Item1, ex.Item2, lm, ex.Item3);
Set(_expressions, from, to , ret);
return ret;
}
SqlQuery.Condition ParseAnyCondition(SetType setType, Expression expr, LambdaInfo lambda, Expression inExpr)
{
throw new NotImplementedException();
/*
var sql = CurrentSql;
var cs = _convertSource;
CurrentSql = new SqlQuery();
var associationList = new Dictionary<QuerySource,QuerySource>();
_convertSource = (s,l) =>
{
var t = s as QuerySource.Table;
if (t != null && t.ParentAssociation != null)
{
if (ParentQueries.Count > 0)
{
foreach (var parentQuery in ParentQueries)
{
var parent = parentQuery.Parent;
while (parent is QuerySource.SubQuerySourceColumn)
parent = ((QuerySource.SubQuerySourceColumn)parent).SourceColumn;
if (parent.Find(t.ParentAssociation))
{
var orig = t;
t = CreateTable(new SqlQuery(), l);
associationList.Add(t, orig);
var csql = CurrentSql.From.Tables.Count == 0 ? t.SqlQuery : CurrentSql;
foreach (var c in orig.ParentAssociationJoin.Condition.Conditions)
{
var predicate = (SqlQuery.Predicate.ExprExpr)c.Predicate;
csql.Where
.Expr(predicate.Expr1)
.Equal
.Field(t.Columns[((SqlField)predicate.Expr2).Name].Field);
}
s = t;
break;
}
}
}
}
else
s = cs(s, l);
return s;
};
var query = ParseSequence(expr)[0];
var any = CurrentSql;
_convertSource = cs;
if (lambda != null)
{
if (setType == SetType.All)
{
var e = Expression.Not(lambda.Body);
//var pi = new NotParseInfo(e, lambda.Body);
lambda = new LambdaInfo(e, lambda.Parameters);
}
if (inExpr == null || query.Fields.Count != 1)
ParseWhere(lambda, query);
}
any.ParentSql = sql;
CurrentSql = sql;
SqlQuery.Condition cond;
if (inExpr != null && query.Fields.Count == 1)
{
query.Select(this);
var ex = ParseExpression(inExpr);
cond = new SqlQuery.Condition(false, new SqlQuery.Predicate.InSubQuery(ex, false, any));
}
else
cond = new SqlQuery.Condition(setType == SetType.All, new SqlQuery.Predicate.FuncLike(SqlFunction.CreateExists(any)));
ParsingTracer.DecIndentLevel();
return cond;
*/
}
/// <summary>
/// Visit lambda expression for scope tracking and closure emitting purposes.
/// </summary>
/// <typeparam name="T">The type of the delegate represented by the lambda expression.</typeparam>
/// <param name="node">The lambda expression to rewrite.</param>
/// <returns>The rewritten lambda expression.</returns>
protected override Expression VisitLambda <T>(Expression <T> node)
{
//
// Allocate a slot for information about the rewritten lambda expression and thunk
// type. We add a temporary empty value to the dictionary slot here in order to
// boost the count of entries. This causes the index to be logically numbered in
// the order the lambda expressions were visited.
//
var index = _lambdas.Count;
_lambdas[index] = default;
//
// Introduce a new scope and keep track of the original scope in order to restore
// it after visiting child expressions.
//
var currentScope = _scope;
try
{
var scope = _analysis[node];
_scope = new CompilerScope(currentScope, scope);
var body = default(Expression);
if (!scope.HasHoistedLocals && !scope.NeedsClosure)
{
body = Visit(node.Body);
}
else
{
//
// Visit the body and append it to the builder. Note that hoisted locals
// (i.e. parameters) are copied into the closure.
//
var builder = _scope.Enter(count: 1, copyLocals: true);
builder.Append(Visit(node.Body));
body = builder.Finish(declareLocals: false);
}
//
// Use the closure parameter of the original scope (i.e. the parent to the
// scope representing the lambda) to derive information about the thunk type.
//
var closureParam = currentScope.Closure;
var thunkType = _thunkFactory.GetThunkType(typeof(T), closureParam.Type);
var innerDelegateType = GetInnerDelegateType(thunkType);
//
// Construct a lambda that's parameterized on the closure that's passed in,
// using the inner delegate type that the thunk expects. This becomes the
// rewritten lambda expression, which will be passed to the constructor of
// the thunk type in GetMethodTable.
//
var parameters = new ParameterExpression[node.Parameters.Count + 1];
parameters[0] = closureParam;
node.Parameters.CopyTo(parameters, index: 1);
var lambda = Expression.Lambda(innerDelegateType, body, parameters);
_lambdas[index] = new LambdaInfo(lambda, thunkType);
//
// Inside the expression tree, replace the lambda by a call to CreateDelegate
// on the thunk. The thunk is retrieved from the method table that's passed to
// the top-level lambda by indexing into the Thunks array.
//
var createDelegate = thunkType.GetMethod(nameof(ActionThunk <object> .CreateDelegate));
var methodTable = currentScope.Bind(_methodTable);
var createDelegateCall =
Expression.Call(
Expression.Convert(
Expression.ArrayIndex(
Expression.Field(
methodTable,
nameof(MethodTable.Thunks)
),
Expression.Constant(index)
),
thunkType
),
createDelegate,
closureParam
);
return(createDelegateCall);
}
finally
{
_scope = currentScope;
}
}
static void Set(ConcurrentDictionary <Type, ConcurrentDictionary <Type, LambdaInfo> > expressions, Type from, Type to, LambdaInfo expr)
{
ConcurrentDictionary <Type, LambdaInfo> dic;
if (!expressions.TryGetValue(from, out dic))
{
expressions[from] = dic = new ConcurrentDictionary <Type, LambdaInfo>();
}
dic[to] = expr;
}
public void Set(Type from, Type to, LambdaInfo expr)
{
Set(_expressions, from, to, expr);
}
static Expression ConverLetSubqueries(Expression expression)
{
var result = expression;
do
{
expression = result;
// Find let subqueries.
//
var dic = new Dictionary <MemberInfo, Expression>();
expression.Visit(ex =>
{
switch (ex.NodeType)
{
case ExpressionType.Call:
{
var me = (MethodCallExpression)ex;
LambdaInfo lambda = null;
if (me.Method.Name == "Select" &&
(me.IsQueryableMethod((_, l) => { lambda = l; return(true); }) ||
me.IsQueryableMethod(null, 2, _ => { }, l => lambda = l)))
{
lambda.Body.Visit(e =>
{
switch (e.NodeType)
{
case ExpressionType.New:
{
var ne = (NewExpression)e;
if (ne.Members == null || ne.Arguments.Count != ne.Members.Count)
{
break;
}
var args = ne.Arguments.Zip(ne.Members, (a, m) => new { a, m }).ToList();
var q =
from a in args
where
a.a.NodeType == ExpressionType.Call &&
a.a.Type != typeof(string) &&
!a.a.Type.IsArray &&
TypeHelper.GetGenericType(typeof(IEnumerable <>), a.a.Type) != null
select a;
foreach (var item in q)
{
dic.Add(item.m, item.a);
}
}
break;
}
});
}
}
break;
}
});
if (dic.Count == 0)
{
return(expression);
}
result = expression.Convert(ex =>
{
switch (ex.NodeType)
{
case ExpressionType.MemberAccess:
{
var me = (MemberExpression)ex;
var member = me.Member;
if (member is PropertyInfo)
{
member = ((PropertyInfo)member).GetGetMethod();
}
Expression arg;
if (dic.TryGetValue(member, out arg))
{
return(arg);
}
}
break;
}
return(ex);
});
} while (result != expression);
return(expression);
}
public void Set(Type from, Type to, LambdaInfo expr)
{
Set(_expressions, from, to, expr);
}