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throw ParseError(errorPos, Res.CannotConvertValue,
GetTypeName(exprType), GetTypeName(type));
}
Expression ParseMemberAccess(Type type, Expression instance) {
if (instance != null) type = instance.Type;
int errorPos = token.pos;
string id = GetIdentifier();
NextToken();
if (token.id == TokenId.OpenParen) {
if (instance != null && type != typeof(string)) {
Type enumerableType = FindGenericType(typeof(IEnumerable<>), type);
if (enumerableType != null) {
Type elementType = enumerableType.GetGenericArguments()[0];
return ParseAggregate(instance, elementType, id, errorPos);
}
}
Expression[] args = ParseArgumentList();
MethodBase mb;
switch (FindMethod(type, id, instance == null, args, out mb)) {
case 0:
throw ParseError(errorPos, Res.NoApplicableMethod,
id, GetTypeName(type));
case 1:
MethodInfo method = (MethodInfo)mb;
if (!IsPredefinedType(method.DeclaringType))
throw ParseError(errorPos, Res.MethodsAreInaccessible,
GetTypeName(method.DeclaringType));
if (method.ReturnType == typeof(void))
throw ParseError(errorPos, Res.MethodIsVoid,
id, GetTypeName(method.DeclaringType));
return Expression.Call(instance, (MethodInfo)method, args);
default:
throw ParseError(errorPos, Res.AmbiguousMethodInvocation,
id, GetTypeName(type));
}
}
else {
MemberInfo member = FindPropertyOrField(type, id, instance == null);
if (member == null)
throw ParseError(errorPos, Res.UnknownPropertyOrField,
id, GetTypeName(type));
return member is PropertyInfo ?
Expression.Property(instance, (PropertyInfo)member) :
Expression.Field(instance, (FieldInfo)member);
}
}
static Type FindGenericType(Type generic, Type type) {
while (type != null && type != typeof(object)) {
if (type.IsGenericType && type.GetGenericTypeDefinition() == generic) return type;
if (generic.IsInterface) {
foreach (Type intfType in type.GetInterfaces()) {
Type found = FindGenericType(generic, intfType);
if (found != null) return found;
}
}
118
type = type.BaseType;
}
return null;
}
Expression ParseAggregate(Expression instance, Type elementType, string methodName, int
errorPos) {
ParameterExpression outerIt = it;
ParameterExpression innerIt = Expression.Parameter(elementType, "");
it = innerIt;
Expression[] args = ParseArgumentList();
it = outerIt;
MethodBase signature;
if (FindMethod(typeof(IEnumerableSignatures), methodName, false, args, out signature) != 1)
throw ParseError(errorPos, Res.NoApplicableAggregate, methodName);
Type[] typeArgs;
if (signature.Name == "Min" || signature.Name == "Max") {
typeArgs = new Type[] { elementType, args[0].Type };
}
else {
typeArgs = new Type[] { elementType };
}
if (args.Length == 0) {
args = new Expression[] { instance };
}
else {
args = new Expression[] { instance, Expression.Lambda(args[0], innerIt) };
}
return Expression.Call(typeof(Enumerable), signature.Name, typeArgs, args);
}
Expression[] ParseArgumentList() {
ValidateToken(TokenId.OpenParen, Res.OpenParenExpected);
NextToken();
Expression[] args = token.id != TokenId.CloseParen ? ParseArguments() : new Expression[0];
ValidateToken(TokenId.CloseParen, Res.CloseParenOrCommaExpected);
NextToken();
return args;
}
Expression[] ParseArguments() {
List<Expression> argList = new List<Expression>();
while (true) {
argList.Add(ParseExpression());
if (token.id != TokenId.Comma) break;
NextToken();
}
return argList.ToArray();
}
Expression ParseElementAccess(Expression expr) {
int errorPos = token.pos;
ValidateToken(TokenId.OpenBracket, Res.OpenParenExpected);
NextToken();
Expression[] args = ParseArguments();
ValidateToken(TokenId.CloseBracket, Res.CloseBracketOrCommaExpected);
NextToken();
119
if (expr.Type.IsArray) {
if (expr.Type.GetArrayRank() != 1 || args.Length != 1)
throw ParseError(errorPos, Res.CannotIndexMultiDimArray);
Expression index = PromoteExpression(args[0], typeof(int), true);
if (index == null)
throw ParseError(errorPos, Res.InvalidIndex);
return Expression.ArrayIndex(expr, index);
}
else {
MethodBase mb;
switch (FindIndexer(expr.Type, args, out mb)) {
case 0:
throw ParseError(errorPos, Res.NoApplicableIndexer,
GetTypeName(expr.Type));
case 1:
return Expression.Call(expr, (MethodInfo)mb, args);
default:
throw ParseError(errorPos, Res.AmbiguousIndexerInvocation,
GetTypeName(expr.Type));
}
}
}
static bool IsPredefinedType(Type type) {
foreach (Type t in predefinedTypes) if (t == type) return true;
return false;
}
static bool IsNullableType(Type type) {
return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
}
static Type GetNonNullableType(Type type) {
return IsNullableType(type) ? type.GetGenericArguments()[0] : type;
}
static string GetTypeName(Type type) {
Type baseType = GetNonNullableType(type);
string s = baseType.Name;
if (type != baseType) s += '?';
return s;
}
static bool IsNumericType(Type type) {
return GetNumericTypeKind(type) != 0;
}
static bool IsSignedIntegralType(Type type) {
return GetNumericTypeKind(type) == 2;
}
static bool IsUnsignedIntegralType(Type type) {
return GetNumericTypeKind(type) == 3;
}
static int GetNumericTypeKind(Type type) {
type = GetNonNullableType(type);
120
if (type.IsEnum) return 0;
switch (Type.GetTypeCode(type)) {
case TypeCode.Char:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return 1;
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
return 2;
case TypeCode.Byte:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
return 3;
default:
return 0;
}
}
static bool IsEnumType(Type type) {
return GetNonNullableType(type).IsEnum;
}
void CheckAndPromoteOperand(Type signatures, string opName, ref Expression expr, int
errorPos) {
Expression[] args = new Expression[] { expr };
MethodBase method;
if (FindMethod(signatures, "F", false, args, out method) != 1)
throw ParseError(errorPos, Res.IncompatibleOperand,
opName, GetTypeName(args[0].Type));
expr = args[0];
}
void CheckAndPromoteOperands(Type signatures, string opName, ref Expression left, ref
Expression right, int errorPos) {
Expression[] args = new Expression[] { left, right };
MethodBase method;
if (FindMethod(signatures, "F", false, args, out method) != 1)
throw IncompatibleOperandsError(opName, left, right, errorPos);
left = args[0];
right = args[1];
}
Exception IncompatibleOperandsError(string opName, Expression left, Expression right, int pos)
{
return ParseError(pos, Res.IncompatibleOperands,
opName, GetTypeName(left.Type), GetTypeName(right.Type));
}
MemberInfo FindPropertyOrField(Type type, string memberName, bool staticAccess) {
BindingFlags flags = BindingFlags.Public | BindingFlags.DeclaredOnly |
(staticAccess ? BindingFlags.Static : BindingFlags.Instance);
foreach (Type t in SelfAndBaseTypes(type)) {
MemberInfo[] members = t.FindMembers(MemberTypes.Property | MemberTypes.Field,
121
flags, Type.FilterNameIgnoreCase, memberName);
if (members.Length != 0) return members[0];
}
return null;
}
int FindMethod(Type type, string methodName, bool staticAccess, Expression[] args, out
MethodBase method) {
BindingFlags flags = BindingFlags.Public | BindingFlags.DeclaredOnly |
(staticAccess ? BindingFlags.Static : BindingFlags.Instance);
foreach (Type t in SelfAndBaseTypes(type)) {
MemberInfo[] members = t.FindMembers(MemberTypes.Method,
flags, Type.FilterNameIgnoreCase, methodName);
int count = FindBestMethod(members.Cast<MethodBase>(), args, out method);
if (count != 0) return count;
}
method = null;
return 0;
}
int FindIndexer(Type type, Expression[] args, out MethodBase method) {
foreach (Type t in SelfAndBaseTypes(type)) {
MemberInfo[] members = t.GetDefaultMembers();
if (members.Length != 0) {
IEnumerable<MethodBase> methods = members.
OfType<PropertyInfo>().
Select(p => (MethodBase)p.GetGetMethod()).
Where(m => m != null);
int count = FindBestMethod(methods, args, out method);
if (count != 0) return count;
}
}
method = null;
return 0;
}
static IEnumerable<Type> SelfAndBaseTypes(Type type) {
if (type.IsInterface) {
List<Type> types = new List<Type>();
AddInterface(types, type);
return types;
}
return SelfAndBaseClasses(type);
}
static IEnumerable<Type> SelfAndBaseClasses(Type type) {
while (type != null) {
yield return type;
type = type.BaseType;
}
}
static void AddInterface(List<Type> types, Type type) {
if (!types.Contains(type)) {
types.Add(type);
foreach (Type t in type.GetInterfaces()) AddInterface(types, t);
}
Источник: https://baza.diplomsite.ru/previewfile/1781

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