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- using System.Collections.Generic;
- using System.Text;
- using System.Linq.Expressions;
- using System.Reflection;
- using System.Reflection.Emit;
- using System.Threading;
- using System.Linq;
- using System;
- namespace Ant.ORM
- {
- public static class DynamicQueryable
- {
- public static IQueryable<T> Where<T>(this IQueryable<T> source, string predicate, params object[] values)
- {
- return (IQueryable<T>)Where((IQueryable)source, predicate, values);
- }
- public static IQueryable Where(this IQueryable source, string predicate, params object[] values)
- {
- if (source == null) throw new ArgumentNullException("source");
- if (predicate == null) throw new ArgumentNullException("predicate");
- LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType, typeof(bool), predicate, values);
- return source.Provider.CreateQuery(
- Expression.Call(
- typeof(Queryable), "Where",
- new Type[] { source.ElementType },
- source.Expression, Expression.Quote(lambda)));
- }
- public static IQueryable Select(this IQueryable source, string selector, params object[] values)
- {
- if (source == null) throw new ArgumentNullException("source");
- if (selector == null) throw new ArgumentNullException("selector");
- LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType, null, selector, values);
- return source.Provider.CreateQuery(
- Expression.Call(
- typeof(Queryable), "Select",
- new Type[] { source.ElementType, lambda.Body.Type },
- source.Expression, Expression.Quote(lambda)));
- }
- public static IQueryable<T> DynamicOrderBy<T>(this IQueryable<T> source, string ordering, params object[] values)
- {
- return (IQueryable<T>)DynamicOrderBy((IQueryable)source, ordering, values);
- }
- public static IQueryable DynamicOrderBy(this IQueryable source, string ordering, params object[] values)
- {
- if (source == null) throw new ArgumentNullException("source");
- if (ordering == null) throw new ArgumentNullException("ordering");
- ParameterExpression[] parameters = new ParameterExpression[] {
- Expression.Parameter(source.ElementType, "") };
- ExpressionParser parser = new ExpressionParser(parameters, ordering, values);
- IEnumerable<DynamicOrdering> orderings = parser.ParseOrdering();
- Expression queryExpr = source.Expression;
- string methodAsc = "OrderBy";
- string methodDesc = "OrderByDescending";
- foreach (DynamicOrdering o in orderings)
- {
- queryExpr = Expression.Call(
- typeof(Queryable), o.Ascending ? methodAsc : methodDesc,
- new Type[] { source.ElementType, o.Selector.Type },
- queryExpr, Expression.Quote(Expression.Lambda(o.Selector, parameters)));
- methodAsc = "ThenBy";
- methodDesc = "ThenByDescending";
- }
- return source.Provider.CreateQuery(queryExpr);
- }
- public static IQueryable Take(this IQueryable source, int count)
- {
- if (source == null) throw new ArgumentNullException("source");
- return source.Provider.CreateQuery(
- Expression.Call(
- typeof(Queryable), "Take",
- new Type[] { source.ElementType },
- source.Expression, Expression.Constant(count)));
- }
- public static IQueryable Skip(this IQueryable source, int count)
- {
- if (source == null) throw new ArgumentNullException("source");
- return source.Provider.CreateQuery(
- Expression.Call(
- typeof(Queryable), "Skip",
- new Type[] { source.ElementType },
- source.Expression, Expression.Constant(count)));
- }
- public static IQueryable GroupBy(this IQueryable source, string keySelector, string elementSelector, params object[] values)
- {
- if (source == null) throw new ArgumentNullException("source");
- if (keySelector == null) throw new ArgumentNullException("keySelector");
- if (elementSelector == null) throw new ArgumentNullException("elementSelector");
- LambdaExpression keyLambda = DynamicExpression.ParseLambda(source.ElementType, null, keySelector, values);
- LambdaExpression elementLambda = DynamicExpression.ParseLambda(source.ElementType, null, elementSelector, values);
- return source.Provider.CreateQuery(
- Expression.Call(
- typeof(Queryable), "GroupBy",
- new Type[] { source.ElementType, keyLambda.Body.Type, elementLambda.Body.Type },
- source.Expression, Expression.Quote(keyLambda), Expression.Quote(elementLambda)));
- }
- public static bool Any(this IQueryable source)
- {
- if (source == null) throw new ArgumentNullException("source");
- return (bool)source.Provider.Execute(
- Expression.Call(
- typeof(Queryable), "Any",
- new Type[] { source.ElementType }, source.Expression));
- }
- public static int Count(this IQueryable source)
- {
- if (source == null) throw new ArgumentNullException("source");
- return (int)source.Provider.Execute(
- Expression.Call(
- typeof(Queryable), "Count",
- new Type[] { source.ElementType }, source.Expression));
- }
- }
- public abstract class DynamicClass
- {
- public override string ToString()
- {
- PropertyInfo[] props = this.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
- StringBuilder sb = new StringBuilder();
- sb.Append("{");
- for (int i = 0; i < props.Length; i++)
- {
- if (i > 0) sb.Append(", ");
- sb.Append(props[i].Name);
- sb.Append("=");
- sb.Append(props[i].GetValue(this, null));
- }
- sb.Append("}");
- return sb.ToString();
- }
- }
- public class DynamicProperty
- {
- string name;
- Type type;
- public DynamicProperty(string name, Type type)
- {
- if (name == null) throw new ArgumentNullException("name");
- if (type == null) throw new ArgumentNullException("type");
- this.name = name;
- this.type = type;
- }
- public string Name
- {
- get { return name; }
- }
- public Type Type
- {
- get { return type; }
- }
- }
- public static class DynamicExpression
- {
- public static Expression Parse(Type resultType, string expression, params object[] values)
- {
- ExpressionParser parser = new ExpressionParser(null, expression, values);
- return parser.Parse(resultType);
- }
- public static LambdaExpression ParseLambda(Type itType, Type resultType, string expression, params object[] values)
- {
- return ParseLambda(new ParameterExpression[] { Expression.Parameter(itType, "") }, resultType, expression, values);
- }
- public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type resultType, string expression, params object[] values)
- {
- ExpressionParser parser = new ExpressionParser(parameters, expression, values);
- return Expression.Lambda(parser.Parse(resultType), parameters);
- }
- public static Expression<Func<T, S>> ParseLambda<T, S>(string expression, params object[] values)
- {
- return (Expression<Func<T, S>>)ParseLambda(typeof(T), typeof(S), expression, values);
- }
- public static Type CreateClass(params DynamicProperty[] properties)
- {
- return ClassFactory.Instance.GetDynamicClass(properties);
- }
- public static Type CreateClass(IEnumerable<DynamicProperty> properties)
- {
- return ClassFactory.Instance.GetDynamicClass(properties);
- }
- }
- internal class DynamicOrdering
- {
- public Expression Selector;
- public bool Ascending;
- }
- internal class Signature : IEquatable<Signature>
- {
- public DynamicProperty[] properties;
- public int hashCode;
- public Signature(IEnumerable<DynamicProperty> properties)
- {
- this.properties = properties.ToArray();
- hashCode = 0;
- foreach (DynamicProperty p in properties)
- {
- hashCode ^= p.Name.GetHashCode() ^ p.Type.GetHashCode();
- }
- }
- public override int GetHashCode()
- {
- return hashCode;
- }
- public override bool Equals(object obj)
- {
- return obj is Signature ? Equals((Signature)obj) : false;
- }
- public bool Equals(Signature other)
- {
- if (properties.Length != other.properties.Length) return false;
- for (int i = 0; i < properties.Length; i++)
- {
- if (properties[i].Name != other.properties[i].Name ||
- properties[i].Type != other.properties[i].Type) return false;
- }
- return true;
- }
- }
- internal class ClassFactory
- {
- public static readonly ClassFactory Instance = new ClassFactory();
- static ClassFactory() { } // Trigger lazy initialization of static fields
- ModuleBuilder module;
- Dictionary<Signature, Type> classes;
- int classCount;
- ReaderWriterLock rwLock;
- private ClassFactory()
- {
- AssemblyName name = new AssemblyName("DynamicClasses");
- AssemblyBuilder assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(name, AssemblyBuilderAccess.Run);
- #if ENABLE_LINQ_PARTIAL_TRUST
- new ReflectionPermission(PermissionState.Unrestricted).Assert();
- #endif
- try
- {
- module = assembly.DefineDynamicModule("Module");
- }
- finally
- {
- #if ENABLE_LINQ_PARTIAL_TRUST
- PermissionSet.RevertAssert();
- #endif
- }
- classes = new Dictionary<Signature, Type>();
- rwLock = new ReaderWriterLock();
- }
- public Type GetDynamicClass(IEnumerable<DynamicProperty> properties)
- {
- rwLock.AcquireReaderLock(Timeout.Infinite);
- try
- {
- Signature signature = new Signature(properties);
- Type type;
- if (!classes.TryGetValue(signature, out type))
- {
- type = CreateDynamicClass(signature.properties);
- classes.Add(signature, type);
- }
- return type;
- }
- finally
- {
- rwLock.ReleaseReaderLock();
- }
- }
- Type CreateDynamicClass(DynamicProperty[] properties)
- {
- LockCookie cookie = rwLock.UpgradeToWriterLock(Timeout.Infinite);
- try
- {
- string typeName = "DynamicClass" + (classCount + 1);
- #if ENABLE_LINQ_PARTIAL_TRUST
- new ReflectionPermission(PermissionState.Unrestricted).Assert();
- #endif
- try
- {
- TypeBuilder tb = this.module.DefineType(typeName, TypeAttributes.Class |
- TypeAttributes.Public, typeof(DynamicClass));
- FieldInfo[] fields = GenerateProperties(tb, properties);
- GenerateEquals(tb, fields);
- GenerateGetHashCode(tb, fields);
- Type result = tb.CreateType();
- classCount++;
- return result;
- }
- finally
- {
- #if ENABLE_LINQ_PARTIAL_TRUST
- PermissionSet.RevertAssert();
- #endif
- }
- }
- finally
- {
- rwLock.DowngradeFromWriterLock(ref cookie);
- }
- }
- FieldInfo[] GenerateProperties(TypeBuilder tb, DynamicProperty[] properties)
- {
- FieldInfo[] fields = new FieldBuilder[properties.Length];
- for (int i = 0; i < properties.Length; i++)
- {
- DynamicProperty dp = properties[i];
- FieldBuilder fb = tb.DefineField("_" + dp.Name, dp.Type, FieldAttributes.Private);
- PropertyBuilder pb = tb.DefineProperty(dp.Name, PropertyAttributes.HasDefault, dp.Type, null);
- MethodBuilder mbGet = tb.DefineMethod("get_" + dp.Name,
- MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig,
- dp.Type, Type.EmptyTypes);
- ILGenerator genGet = mbGet.GetILGenerator();
- genGet.Emit(OpCodes.Ldarg_0);
- genGet.Emit(OpCodes.Ldfld, fb);
- genGet.Emit(OpCodes.Ret);
- MethodBuilder mbSet = tb.DefineMethod("set_" + dp.Name,
- MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig,
- null, new Type[] { dp.Type });
- ILGenerator genSet = mbSet.GetILGenerator();
- genSet.Emit(OpCodes.Ldarg_0);
- genSet.Emit(OpCodes.Ldarg_1);
- genSet.Emit(OpCodes.Stfld, fb);
- genSet.Emit(OpCodes.Ret);
- pb.SetGetMethod(mbGet);
- pb.SetSetMethod(mbSet);
- fields[i] = fb;
- }
- return fields;
- }
- void GenerateEquals(TypeBuilder tb, FieldInfo[] fields)
- {
- MethodBuilder mb = tb.DefineMethod("Equals",
- MethodAttributes.Public | MethodAttributes.ReuseSlot |
- MethodAttributes.Virtual | MethodAttributes.HideBySig,
- typeof(bool), new Type[] { typeof(object) });
- ILGenerator gen = mb.GetILGenerator();
- LocalBuilder other = gen.DeclareLocal(tb);
- Label next = gen.DefineLabel();
- gen.Emit(OpCodes.Ldarg_1);
- gen.Emit(OpCodes.Isinst, tb);
- gen.Emit(OpCodes.Stloc, other);
- gen.Emit(OpCodes.Ldloc, other);
- gen.Emit(OpCodes.Brtrue_S, next);
- gen.Emit(OpCodes.Ldc_I4_0);
- gen.Emit(OpCodes.Ret);
- gen.MarkLabel(next);
- foreach (FieldInfo field in fields)
- {
- Type ft = field.FieldType;
- Type ct = typeof(EqualityComparer<>).MakeGenericType(ft);
- next = gen.DefineLabel();
- gen.EmitCall(OpCodes.Call, ct.GetMethod("get_Default"), null);
- gen.Emit(OpCodes.Ldarg_0);
- gen.Emit(OpCodes.Ldfld, field);
- gen.Emit(OpCodes.Ldloc, other);
- gen.Emit(OpCodes.Ldfld, field);
- gen.EmitCall(OpCodes.Callvirt, ct.GetMethod("Equals", new Type[] { ft, ft }), null);
- gen.Emit(OpCodes.Brtrue_S, next);
- gen.Emit(OpCodes.Ldc_I4_0);
- gen.Emit(OpCodes.Ret);
- gen.MarkLabel(next);
- }
- gen.Emit(OpCodes.Ldc_I4_1);
- gen.Emit(OpCodes.Ret);
- }
- void GenerateGetHashCode(TypeBuilder tb, FieldInfo[] fields)
- {
- MethodBuilder mb = tb.DefineMethod("GetHashCode",
- MethodAttributes.Public | MethodAttributes.ReuseSlot |
- MethodAttributes.Virtual | MethodAttributes.HideBySig,
- typeof(int), Type.EmptyTypes);
- ILGenerator gen = mb.GetILGenerator();
- gen.Emit(OpCodes.Ldc_I4_0);
- foreach (FieldInfo field in fields)
- {
- Type ft = field.FieldType;
- Type ct = typeof(EqualityComparer<>).MakeGenericType(ft);
- gen.EmitCall(OpCodes.Call, ct.GetMethod("get_Default"), null);
- gen.Emit(OpCodes.Ldarg_0);
- gen.Emit(OpCodes.Ldfld, field);
- gen.EmitCall(OpCodes.Callvirt, ct.GetMethod("GetHashCode", new Type[] { ft }), null);
- gen.Emit(OpCodes.Xor);
- }
- gen.Emit(OpCodes.Ret);
- }
- }
- public sealed class ParseException : Exception
- {
- int position;
- public ParseException(string message, int position)
- : base(message)
- {
- this.position = position;
- }
- public int Position
- {
- get { return position; }
- }
- public override string ToString()
- {
- return string.Format(Res.ParseExceptionFormat, Message, position);
- }
- }
- internal class ExpressionParser
- {
- struct Token
- {
- public TokenId id;
- public string text;
- public int pos;
- }
- enum TokenId
- {
- Unknown,
- End,
- Identifier,
- StringLiteral,
- IntegerLiteral,
- RealLiteral,
- Exclamation,
- Percent,
- Amphersand,
- OpenParen,
- CloseParen,
- Asterisk,
- Plus,
- Comma,
- Minus,
- Dot,
- Slash,
- Colon,
- LessThan,
- Equal,
- GreaterThan,
- Question,
- OpenBracket,
- CloseBracket,
- Bar,
- ExclamationEqual,
- DoubleAmphersand,
- LessThanEqual,
- LessGreater,
- DoubleEqual,
- GreaterThanEqual,
- DoubleBar
- }
- interface ILogicalSignatures
- {
- void F(bool x, bool y);
- void F(bool? x, bool? y);
- }
- interface IArithmeticSignatures
- {
- void F(int x, int y);
- void F(uint x, uint y);
- void F(long x, long y);
- void F(ulong x, ulong y);
- void F(float x, float y);
- void F(double x, double y);
- void F(decimal x, decimal y);
- void F(int? x, int? y);
- void F(uint? x, uint? y);
- void F(long? x, long? y);
- void F(ulong? x, ulong? y);
- void F(float? x, float? y);
- void F(double? x, double? y);
- void F(decimal? x, decimal? y);
- }
- interface IRelationalSignatures : IArithmeticSignatures
- {
- void F(string x, string y);
- void F(char x, char y);
- void F(DateTime x, DateTime y);
- void F(TimeSpan x, TimeSpan y);
- void F(char? x, char? y);
- void F(DateTime? x, DateTime? y);
- void F(TimeSpan? x, TimeSpan? y);
- }
- interface IEqualitySignatures : IRelationalSignatures
- {
- void F(bool x, bool y);
- void F(bool? x, bool? y);
- }
- interface IAddSignatures : IArithmeticSignatures
- {
- void F(DateTime x, TimeSpan y);
- void F(TimeSpan x, TimeSpan y);
- void F(DateTime? x, TimeSpan? y);
- void F(TimeSpan? x, TimeSpan? y);
- }
- interface ISubtractSignatures : IAddSignatures
- {
- void F(DateTime x, DateTime y);
- void F(DateTime? x, DateTime? y);
- }
- interface INegationSignatures
- {
- void F(int x);
- void F(long x);
- void F(float x);
- void F(double x);
- void F(decimal x);
- void F(int? x);
- void F(long? x);
- void F(float? x);
- void F(double? x);
- void F(decimal? x);
- }
- interface INotSignatures
- {
- void F(bool x);
- void F(bool? x);
- }
- interface IEnumerableSignatures
- {
- void Where(bool predicate);
- void Any();
- void Any(bool predicate);
- void All(bool predicate);
- void Count();
- void Count(bool predicate);
- void Min(object selector);
- void Max(object selector);
- void Sum(int selector);
- void Sum(int? selector);
- void Sum(long selector);
- void Sum(long? selector);
- void Sum(float selector);
- void Sum(float? selector);
- void Sum(double selector);
- void Sum(double? selector);
- void Sum(decimal selector);
- void Sum(decimal? selector);
- void Average(int selector);
- void Average(int? selector);
- void Average(long selector);
- void Average(long? selector);
- void Average(float selector);
- void Average(float? selector);
- void Average(double selector);
- void Average(double? selector);
- void Average(decimal selector);
- void Average(decimal? selector);
- }
- static readonly Type[] predefinedTypes = {
- typeof(Object),
- typeof(Boolean),
- typeof(Char),
- typeof(String),
- typeof(SByte),
- typeof(Byte),
- typeof(Int16),
- typeof(UInt16),
- typeof(Int32),
- typeof(UInt32),
- typeof(Int64),
- typeof(UInt64),
- typeof(Single),
- typeof(Double),
- typeof(Decimal),
- typeof(DateTime),
- typeof(TimeSpan),
- typeof(Guid),
- typeof(Math),
- typeof(Convert)
- };
- static readonly Expression trueLiteral = Expression.Constant(true);
- static readonly Expression falseLiteral = Expression.Constant(false);
- static readonly Expression nullLiteral = Expression.Constant(null);
- static readonly string keywordIt = "it";
- static readonly string keywordIif = "iif";
- static readonly string keywordNew = "new";
- static Dictionary<string, object> keywords;
- Dictionary<string, object> symbols;
- IDictionary<string, object> externals;
- Dictionary<Expression, string> literals;
- ParameterExpression it;
- string text;
- int textPos;
- int textLen;
- char ch;
- Token token;
- public ExpressionParser(ParameterExpression[] parameters, string expression, object[] values)
- {
- if (expression == null) throw new ArgumentNullException("expression");
- if (keywords == null) keywords = CreateKeywords();
- symbols = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
- literals = new Dictionary<Expression, string>();
- if (parameters != null) ProcessParameters(parameters);
- if (values != null) ProcessValues(values);
- text = expression;
- textLen = text.Length;
- SetTextPos(0);
- NextToken();
- }
- void ProcessParameters(ParameterExpression[] parameters)
- {
- foreach (ParameterExpression pe in parameters)
- if (!String.IsNullOrEmpty(pe.Name))
- AddSymbol(pe.Name, pe);
- if (parameters.Length == 1 && String.IsNullOrEmpty(parameters[0].Name))
- it = parameters[0];
- }
- void ProcessValues(object[] values)
- {
- for (int i = 0; i < values.Length; i++)
- {
- object value = values[i];
- if (i == values.Length - 1 && value is IDictionary<string, object>)
- {
- externals = (IDictionary<string, object>)value;
- }
- else
- {
- AddSymbol("@" + i.ToString(System.Globalization.CultureInfo.InvariantCulture), value);
- }
- }
- }
- void AddSymbol(string name, object value)
- {
- if (symbols.ContainsKey(name))
- throw ParseError(Res.DuplicateIdentifier, name);
- symbols.Add(name, value);
- }
- public Expression Parse(Type resultType)
- {
- int exprPos = token.pos;
- Expression expr = ParseExpression();
- if (resultType != null)
- if ((expr = PromoteExpression(expr, resultType, true)) == null)
- throw ParseError(exprPos, Res.ExpressionTypeMismatch, GetTypeName(resultType));
- ValidateToken(TokenId.End, Res.SyntaxError);
- return expr;
- }
- #pragma warning disable 0219
- public IEnumerable<DynamicOrdering> ParseOrdering()
- {
- List<DynamicOrdering> orderings = new List<DynamicOrdering>();
- while (true)
- {
- Expression expr = ParseExpression();
- bool ascending = true;
- if (TokenIdentifierIs("asc") || TokenIdentifierIs("ascending"))
- {
- NextToken();
- }
- else if (TokenIdentifierIs("desc") || TokenIdentifierIs("descending"))
- {
- NextToken();
- ascending = false;
- }
- orderings.Add(new DynamicOrdering { Selector = expr, Ascending = ascending });
- if (token.id != TokenId.Comma) break;
- NextToken();
- }
- ValidateToken(TokenId.End, Res.SyntaxError);
- return orderings;
- }
- #pragma warning restore 0219
- // ?: operator
- Expression ParseExpression()
- {
- int errorPos = token.pos;
- Expression expr = ParseLogicalOr();
- if (token.id == TokenId.Question)
- {
- NextToken();
- Expression expr1 = ParseExpression();
- ValidateToken(TokenId.Colon, Res.ColonExpected);
- NextToken();
- Expression expr2 = ParseExpression();
- expr = GenerateConditional(expr, expr1, expr2, errorPos);
- }
- return expr;
- }
- // ||, or operator
- Expression ParseLogicalOr()
- {
- Expression left = ParseLogicalAnd();
- while (token.id == TokenId.DoubleBar || TokenIdentifierIs("or"))
- {
- Token op = token;
- NextToken();
- Expression right = ParseLogicalAnd();
- CheckAndPromoteOperands(typeof(ILogicalSignatures), op.text, ref left, ref right, op.pos);
- left = Expression.OrElse(left, right);
- }
- return left;
- }
- // &&, and operator
- Expression ParseLogicalAnd()
- {
- Expression left = ParseComparison();
- while (token.id == TokenId.DoubleAmphersand || TokenIdentifierIs("and"))
- {
- Token op = token;
- NextToken();
- Expression right = ParseComparison();
- CheckAndPromoteOperands(typeof(ILogicalSignatures), op.text, ref left, ref right, op.pos);
- left = Expression.AndAlso(left, right);
- }
- return left;
- }
- // =, ==, !=, <>, >, >=, <, <= operators
- Expression ParseComparison()
- {
- Expression left = ParseAdditive();
- while (token.id == TokenId.Equal || token.id == TokenId.DoubleEqual ||
- token.id == TokenId.ExclamationEqual || token.id == TokenId.LessGreater ||
- token.id == TokenId.GreaterThan || token.id == TokenId.GreaterThanEqual ||
- token.id == TokenId.LessThan || token.id == TokenId.LessThanEqual)
- {
- Token op = token;
- NextToken();
- Expression right = ParseAdditive();
- bool isEquality = op.id == TokenId.Equal || op.id == TokenId.DoubleEqual ||
- op.id == TokenId.ExclamationEqual || op.id == TokenId.LessGreater;
- if (isEquality && !left.Type.IsValueType && !right.Type.IsValueType)
- {
- if (left.Type != right.Type)
- {
- if (left.Type.IsAssignableFrom(right.Type))
- {
- right = Expression.Convert(right, left.Type);
- }
- else if (right.Type.IsAssignableFrom(left.Type))
- {
- left = Expression.Convert(left, right.Type);
- }
- else
- {
- throw IncompatibleOperandsError(op.text, left, right, op.pos);
- }
- }
- }
- else if (IsEnumType(left.Type) || IsEnumType(right.Type))
- {
- if (left.Type != right.Type)
- {
- Expression e;
- if ((e = PromoteExpression(right, left.Type, true)) != null)
- {
- right = e;
- }
- else if ((e = PromoteExpression(left, right.Type, true)) != null)
- {
- left = e;
- }
- else
- {
- throw IncompatibleOperandsError(op.text, left, right, op.pos);
- }
- }
- }
- else
- {
- CheckAndPromoteOperands(isEquality ? typeof(IEqualitySignatures) : typeof(IRelationalSignatures),
- op.text, ref left, ref right, op.pos);
- }
- switch (op.id)
- {
- case TokenId.Equal:
- case TokenId.DoubleEqual:
- left = GenerateEqual(left, right);
- break;
- case TokenId.ExclamationEqual:
- case TokenId.LessGreater:
- left = GenerateNotEqual(left, right);
- break;
- case TokenId.GreaterThan:
- left = GenerateGreaterThan(left, right);
- break;
- case TokenId.GreaterThanEqual:
- left = GenerateGreaterThanEqual(left, right);
- break;
- case TokenId.LessThan:
- left = GenerateLessThan(left, right);
- break;
- case TokenId.LessThanEqual:
- left = GenerateLessThanEqual(left, right);
- break;
- }
- }
- return left;
- }
- // +, -, & operators
- Expression ParseAdditive()
- {
- Expression left = ParseMultiplicative();
- while (token.id == TokenId.Plus || token.id == TokenId.Minus ||
- token.id == TokenId.Amphersand)
- {
- Token op = token;
- NextToken();
- Expression right = ParseMultiplicative();
- switch (op.id)
- {
- case TokenId.Plus:
- if (left.Type == typeof(string) || right.Type == typeof(string))
- goto case TokenId.Amphersand;
- CheckAndPromoteOperands(typeof(IAddSignatures), op.text, ref left, ref right, op.pos);
- left = GenerateAdd(left, right);
- break;
- case TokenId.Minus:
- CheckAndPromoteOperands(typeof(ISubtractSignatures), op.text, ref left, ref right, op.pos);
- left = GenerateSubtract(left, right);
- break;
- case TokenId.Amphersand:
- left = GenerateStringConcat(left, right);
- break;
- }
- }
- return left;
- }
- // *, /, %, mod operators
- Expression ParseMultiplicative()
- {
- Expression left = ParseUnary();
- while (token.id == TokenId.Asterisk || token.id == TokenId.Slash ||
- token.id == TokenId.Percent || TokenIdentifierIs("mod"))
- {
- Token op = token;
- NextToken();
- Expression right = ParseUnary();
- CheckAndPromoteOperands(typeof(IArithmeticSignatures), op.text, ref left, ref right, op.pos);
- switch (op.id)
- {
- case TokenId.Asterisk:
- left = Expression.Multiply(left, right);
- break;
- case TokenId.Slash:
- left = Expression.Divide(left, right);
- break;
- case TokenId.Percent:
- case TokenId.Identifier:
- left = Expression.Modulo(left, right);
- break;
- }
- }
- return left;
- }
- // -, !, not unary operators
- Expression ParseUnary()
- {
- if (token.id == TokenId.Minus || token.id == TokenId.Exclamation ||
- TokenIdentifierIs("not"))
- {
- Token op = token;
- NextToken();
- if (op.id == TokenId.Minus && (token.id == TokenId.IntegerLiteral ||
- token.id == TokenId.RealLiteral))
- {
- token.text = "-" + token.text;
- token.pos = op.pos;
- return ParsePrimary();
- }
- Expression expr = ParseUnary();
- if (op.id == TokenId.Minus)
- {
- CheckAndPromoteOperand(typeof(INegationSignatures), op.text, ref expr, op.pos);
- expr = Expression.Negate(expr);
- }
- else
- {
- CheckAndPromoteOperand(typeof(INotSignatures), op.text, ref expr, op.pos);
- expr = Expression.Not(expr);
- }
- return expr;
- }
- return ParsePrimary();
- }
- Expression ParsePrimary()
- {
- Expression expr = ParsePrimaryStart();
- while (true)
- {
- if (token.id == TokenId.Dot)
- {
- NextToken();
- expr = ParseMemberAccess(null, expr);
- }
- else if (token.id == TokenId.OpenBracket)
- {
- expr = ParseElementAccess(expr);
- }
- else
- {
- break;
- }
- }
- return expr;
- }
- Expression ParsePrimaryStart()
- {
- switch (token.id)
- {
- case TokenId.Identifier:
- return ParseIdentifier();
- case TokenId.StringLiteral:
- return ParseStringLiteral();
- case TokenId.IntegerLiteral:
- return ParseIntegerLiteral();
- case TokenId.RealLiteral:
- return ParseRealLiteral();
- case TokenId.OpenParen:
- return ParseParenExpression();
- default:
- throw ParseError(Res.ExpressionExpected);
- }
- }
- Expression ParseStringLiteral()
- {
- ValidateToken(TokenId.StringLiteral);
- char quote = token.text[0];
- string s = token.text.Substring(1, token.text.Length - 2);
- int start = 0;
- while (true)
- {
- int i = s.IndexOf(quote, start);
- if (i < 0) break;
- s = s.Remove(i, 1);
- start = i + 1;
- }
- if (quote == '\'')
- {
- if (s.Length != 1)
- throw ParseError(Res.InvalidCharacterLiteral);
- NextToken();
- return CreateLiteral(s[0], s);
- }
- NextToken();
- return CreateLiteral(s, s);
- }
- Expression ParseIntegerLiteral()
- {
- ValidateToken(TokenId.IntegerLiteral);
- string text = token.text;
- if (text[0] != '-')
- {
- ulong value;
- if (!UInt64.TryParse(text, out value))
- throw ParseError(Res.InvalidIntegerLiteral, text);
- NextToken();
- if (value <= (ulong)Int32.MaxValue) return CreateLiteral((int)value, text);
- if (value <= (ulong)UInt32.MaxValue) return CreateLiteral((uint)value, text);
- if (value <= (ulong)Int64.MaxValue) return CreateLiteral((long)value, text);
- return CreateLiteral(value, text);
- }
- else
- {
- long value;
- if (!Int64.TryParse(text, out value))
- throw ParseError(Res.InvalidIntegerLiteral, text);
- NextToken();
- if (value >= Int32.MinValue && value <= Int32.MaxValue)
- return CreateLiteral((int)value, text);
- return CreateLiteral(value, text);
- }
- }
- Expression ParseRealLiteral()
- {
- ValidateToken(TokenId.RealLiteral);
- string text = token.text;
- object value = null;
- char last = text[text.Length - 1];
- if (last == 'F' || last == 'f')
- {
- float f;
- if (Single.TryParse(text.Substring(0, text.Length - 1), out f)) value = f;
- }
- else
- {
- double d;
- if (Double.TryParse(text, out d)) value = d;
- }
- if (value == null) throw ParseError(Res.InvalidRealLiteral, text);
- NextToken();
- return CreateLiteral(value, text);
- }
- Expression CreateLiteral(object value, string text)
- {
- ConstantExpression expr = Expression.Constant(value);
- literals.Add(expr, text);
- return expr;
- }
- Expression ParseParenExpression()
- {
- ValidateToken(TokenId.OpenParen, Res.OpenParenExpected);
- NextToken();
- Expression e = ParseExpression();
- ValidateToken(TokenId.CloseParen, Res.CloseParenOrOperatorExpected);
- NextToken();
- return e;
- }
- Expression ParseIdentifier()
- {
- ValidateToken(TokenId.Identifier);
- object value;
- if (keywords.TryGetValue(token.text, out value))
- {
- if (value is Type) return ParseTypeAccess((Type)value);
- if (value == (object)keywordIt) return ParseIt();
- if (value == (object)keywordIif) return ParseIif();
- if (value == (object)keywordNew) return ParseNew();
- NextToken();
- return (Expression)value;
- }
- if (symbols.TryGetValue(token.text, out value) ||
- externals != null && externals.TryGetValue(token.text, out value))
- {
- Expression expr = value as Expression;
- if (expr == null)
- {
- expr = Expression.Constant(value);
- }
- else
- {
- LambdaExpression lambda = expr as LambdaExpression;
- if (lambda != null) return ParseLambdaInvocation(lambda);
- }
- NextToken();
- return expr;
- }
- if (it != null) return ParseMemberAccess(null, it);
- throw ParseError(Res.UnknownIdentifier, token.text);
- }
- Expression ParseIt()
- {
- if (it == null)
- throw ParseError(Res.NoItInScope);
- NextToken();
- return it;
- }
- Expression ParseIif()
- {
- int errorPos = token.pos;
- NextToken();
- Expression[] args = ParseArgumentList();
- if (args.Length != 3)
- throw ParseError(errorPos, Res.IifRequiresThreeArgs);
- return GenerateConditional(args[0], args[1], args[2], errorPos);
- }
- Expression GenerateConditional(Expression test, Expression expr1, Expression expr2, int errorPos)
- {
- if (test.Type != typeof(bool))
- throw ParseError(errorPos, Res.FirstExprMustBeBool);
- if (expr1.Type != expr2.Type)
- {
- Expression expr1as2 = expr2 != nullLiteral ? PromoteExpression(expr1, expr2.Type, true) : null;
- Expression expr2as1 = expr1 != nullLiteral ? PromoteExpression(expr2, expr1.Type, true) : null;
- if (expr1as2 != null && expr2as1 == null)
- {
- expr1 = expr1as2;
- }
- else if (expr2as1 != null && expr1as2 == null)
- {
- expr2 = expr2as1;
- }
- else
- {
- string type1 = expr1 != nullLiteral ? expr1.Type.Name : "null";
- string type2 = expr2 != nullLiteral ? expr2.Type.Name : "null";
- if (expr1as2 != null && expr2as1 != null)
- throw ParseError(errorPos, Res.BothTypesConvertToOther, type1, type2);
- throw ParseError(errorPos, Res.NeitherTypeConvertsToOther, type1, type2);
- }
- }
- return Expression.Condition(test, expr1, expr2);
- }
- Expression ParseNew()
- {
- NextToken();
- ValidateToken(TokenId.OpenParen, Res.OpenParenExpected);
- NextToken();
- List<DynamicProperty> properties = new List<DynamicProperty>();
- List<Expression> expressions = new List<Expression>();
- while (true)
- {
- int exprPos = token.pos;
- Expression expr = ParseExpression();
- string propName;
- if (TokenIdentifierIs("as"))
- {
- NextToken();
- propName = GetIdentifier();
- NextToken();
- }
- else
- {
- MemberExpression me = expr as MemberExpression;
- if (me == null) throw ParseError(exprPos, Res.MissingAsClause);
- propName = me.Member.Name;
- }
- expressions.Add(expr);
- properties.Add(new DynamicProperty(propName, expr.Type));
- if (token.id != TokenId.Comma) break;
- NextToken();
- }
- ValidateToken(TokenId.CloseParen, Res.CloseParenOrCommaExpected);
- NextToken();
- Type type = DynamicExpression.CreateClass(properties);
- MemberBinding[] bindings = new MemberBinding[properties.Count];
- for (int i = 0; i < bindings.Length; i++)
- bindings[i] = Expression.Bind(type.GetProperty(properties[i].Name), expressions[i]);
- return Expression.MemberInit(Expression.New(type), bindings);
- }
- Expression ParseLambdaInvocation(LambdaExpression lambda)
- {
- int errorPos = token.pos;
- NextToken();
- Expression[] args = ParseArgumentList();
- MethodBase method;
- if (FindMethod(lambda.Type, "Invoke", false, args, out method) != 1)
- throw ParseError(errorPos, Res.ArgsIncompatibleWithLambda);
- return Expression.Invoke(lambda, args);
- }
- Expression ParseTypeAccess(Type type)
- {
- int errorPos = token.pos;
- NextToken();
- if (token.id == TokenId.Question)
- {
- if (!type.IsValueType || IsNullableType(type))
- throw ParseError(errorPos, Res.TypeHasNoNullableForm, GetTypeName(type));
- type = typeof(Nullable<>).MakeGenericType(type);
- NextToken();
- }
- if (token.id == TokenId.OpenParen)
- {
- Expression[] args = ParseArgumentList();
- MethodBase method;
- switch (FindBestMethod(type.GetConstructors(), args, out method))
- {
- case 0:
- if (args.Length == 1)
- return GenerateConversion(args[0], type, errorPos);
- throw ParseError(errorPos, Res.NoMatchingConstructor, GetTypeName(type));
- case 1:
- return Expression.New((ConstructorInfo)method, args);
- default:
- throw ParseError(errorPos, Res.AmbiguousConstructorInvocation, GetTypeName(type));
- }
- }
- ValidateToken(TokenId.Dot, Res.DotOrOpenParenExpected);
- NextToken();
- return ParseMemberAccess(type, null);
- }
- Expression GenerateConversion(Expression expr, Type type, int errorPos)
- {
- Type exprType = expr.Type;
- if (exprType == type) return expr;
- if (exprType.IsValueType && type.IsValueType)
- {
- if ((IsNullableType(exprType) || IsNullableType(type)) &&
- GetNonNullableType(exprType) == GetNonNullableType(type))
- return Expression.Convert(expr, type);
- if ((IsNumericType(exprType) || IsEnumType(exprType)) &&
- (IsNumericType(type)) || IsEnumType(type))
- return Expression.ConvertChecked(expr, type);
- }
- if (exprType.IsAssignableFrom(type) || type.IsAssignableFrom(exprType) ||
- exprType.IsInterface || type.IsInterface)
- return Expression.Convert(expr, type);
- 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;
- }
- }
- 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();
- 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);
- 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,
- 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);
- }
- }
- class MethodData
- {
- public MethodBase MethodBase;
- public ParameterInfo[] Parameters;
- public Expression[] Args;
- }
- int FindBestMethod(IEnumerable<MethodBase> methods, Expression[] args, out MethodBase method)
- {
- MethodData[] applicable = methods.
- Select(m => new MethodData { MethodBase = m, Parameters = m.GetParameters() }).
- Where(m => IsApplicable(m, args)).
- ToArray();
- if (applicable.Length > 1)
- {
- applicable = applicable.
- Where(m => applicable.All(n => m == n || IsBetterThan(args, m, n))).
- ToArray();
- }
- if (applicable.Length == 1)
- {
- MethodData md = applicable[0];
- for (int i = 0; i < args.Length; i++) args[i] = md.Args[i];
- method = md.MethodBase;
- }
- else
- {
- method = null;
- }
- return applicable.Length;
- }
- bool IsApplicable(MethodData method, Expression[] args)
- {
- if (method.Parameters.Length != args.Length) return false;
- Expression[] promotedArgs = new Expression[args.Length];
- for (int i = 0; i < args.Length; i++)
- {
- ParameterInfo pi = method.Parameters[i];
- if (pi.IsOut) return false;
- Expression promoted = PromoteExpression(args[i], pi.ParameterType, false);
- if (promoted == null) return false;
- promotedArgs[i] = promoted;
- }
- method.Args = promotedArgs;
- return true;
- }
- Expression PromoteExpression(Expression expr, Type type, bool exact)
- {
- if (expr.Type == type) return expr;
- if (expr is ConstantExpression)
- {
- ConstantExpression ce = (ConstantExpression)expr;
- if (ce == nullLiteral)
- {
- if (!type.IsValueType || IsNullableType(type))
- return Expression.Constant(null, type);
- }
- else
- {
- string text;
- if (literals.TryGetValue(ce, out text))
- {
- Type target = GetNonNullableType(type);
- Object value = null;
- switch (Type.GetTypeCode(ce.Type))
- {
- case TypeCode.Int32:
- case TypeCode.UInt32:
- case TypeCode.Int64:
- case TypeCode.UInt64:
- value = ParseNumber(text, target);
- break;
- case TypeCode.Double:
- if (target == typeof(decimal)) value = ParseNumber(text, target);
- break;
- case TypeCode.String:
- value = ParseEnum(text, target);
- break;
- }
- if (value != null)
- return Expression.Constant(value, type);
- }
- }
- }
- if (IsCompatibleWith(expr.Type, type))
- {
- if (type.IsValueType || exact) return Expression.Convert(expr, type);
- return expr;
- }
- return null;
- }
- static object ParseNumber(string text, Type type)
- {
- switch (Type.GetTypeCode(GetNonNullableType(type)))
- {
- case TypeCode.SByte:
- sbyte sb;
- if (sbyte.TryParse(text, out sb)) return sb;
- break;
- case TypeCode.Byte:
- byte b;
- if (byte.TryParse(text, out b)) return b;
- break;
- case TypeCode.Int16:
- short s;
- if (short.TryParse(text, out s)) return s;
- break;
- case TypeCode.UInt16:
- ushort us;
- if (ushort.TryParse(text, out us)) return us;
- break;
- case TypeCode.Int32:
- int i;
- if (int.TryParse(text, out i)) return i;
- break;
- case TypeCode.UInt32:
- uint ui;
- if (uint.TryParse(text, out ui)) return ui;
- break;
- case TypeCode.Int64:
- long l;
- if (long.TryParse(text, out l)) return l;
- break;
- case TypeCode.UInt64:
- ulong ul;
- if (ulong.TryParse(text, out ul)) return ul;
- break;
- case TypeCode.Single:
- float f;
- if (float.TryParse(text, out f)) return f;
- break;
- case TypeCode.Double:
- double d;
- if (double.TryParse(text, out d)) return d;
- break;
- case TypeCode.Decimal:
- decimal e;
- if (decimal.TryParse(text, out e)) return e;
- break;
- }
- return null;
- }
- static object ParseEnum(string name, Type type)
- {
- if (type.IsEnum)
- {
- MemberInfo[] memberInfos = type.FindMembers(MemberTypes.Field,
- BindingFlags.Public | BindingFlags.DeclaredOnly | BindingFlags.Static,
- Type.FilterNameIgnoreCase, name);
- if (memberInfos.Length != 0) return ((FieldInfo)memberInfos[0]).GetValue(null);
- }
- return null;
- }
- static bool IsCompatibleWith(Type source, Type target)
- {
- if (source == target) return true;
- if (!target.IsValueType) return target.IsAssignableFrom(source);
- Type st = GetNonNullableType(source);
- Type tt = GetNonNullableType(target);
- if (st != source && tt == target) return false;
- TypeCode sc = st.IsEnum ? TypeCode.Object : Type.GetTypeCode(st);
- TypeCode tc = tt.IsEnum ? TypeCode.Object : Type.GetTypeCode(tt);
- switch (sc)
- {
- case TypeCode.SByte:
- switch (tc)
- {
- case TypeCode.SByte:
- case TypeCode.Int16:
- case TypeCode.Int32:
- case TypeCode.Int64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.Byte:
- switch (tc)
- {
- case TypeCode.Byte:
- case TypeCode.Int16:
- case TypeCode.UInt16:
- case TypeCode.Int32:
- case TypeCode.UInt32:
- case TypeCode.Int64:
- case TypeCode.UInt64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.Int16:
- switch (tc)
- {
- case TypeCode.Int16:
- case TypeCode.Int32:
- case TypeCode.Int64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.UInt16:
- switch (tc)
- {
- case TypeCode.UInt16:
- case TypeCode.Int32:
- case TypeCode.UInt32:
- case TypeCode.Int64:
- case TypeCode.UInt64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.Int32:
- switch (tc)
- {
- case TypeCode.Int32:
- case TypeCode.Int64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.UInt32:
- switch (tc)
- {
- case TypeCode.UInt32:
- case TypeCode.Int64:
- case TypeCode.UInt64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.Int64:
- switch (tc)
- {
- case TypeCode.Int64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.UInt64:
- switch (tc)
- {
- case TypeCode.UInt64:
- case TypeCode.Single:
- case TypeCode.Double:
- case TypeCode.Decimal:
- return true;
- }
- break;
- case TypeCode.Single:
- switch (tc)
- {
- case TypeCode.Single:
- case TypeCode.Double:
- return true;
- }
- break;
- default:
- if (st == tt) return true;
- break;
- }
- return false;
- }
- static bool IsBetterThan(Expression[] args, MethodData m1, MethodData m2)
- {
- bool better = false;
- for (int i = 0; i < args.Length; i++)
- {
- int c = CompareConversions(args[i].Type,
- m1.Parameters[i].ParameterType,
- m2.Parameters[i].ParameterType);
- if (c < 0) return false;
- if (c > 0) better = true;
- }
- return better;
- }
- // Return 1 if s -> t1 is a better conversion than s -> t2
- // Return -1 if s -> t2 is a better conversion than s -> t1
- // Return 0 if neither conversion is better
- static int CompareConversions(Type s, Type t1, Type t2)
- {
- if (t1 == t2) return 0;
- if (s == t1) return 1;
- if (s == t2) return -1;
- bool t1t2 = IsCompatibleWith(t1, t2);
- bool t2t1 = IsCompatibleWith(t2, t1);
- if (t1t2 && !t2t1) return 1;
- if (t2t1 && !t1t2) return -1;
- if (IsSignedIntegralType(t1) && IsUnsignedIntegralType(t2)) return 1;
- if (IsSignedIntegralType(t2) && IsUnsignedIntegralType(t1)) return -1;
- return 0;
- }
- Expression GenerateEqual(Expression left, Expression right)
- {
- return Expression.Equal(left, right);
- }
- Expression GenerateNotEqual(Expression left, Expression right)
- {
- return Expression.NotEqual(left, right);
- }
- Expression GenerateGreaterThan(Expression left, Expression right)
- {
- if (left.Type == typeof(string))
- {
- return Expression.GreaterThan(
- GenerateStaticMethodCall("Compare", left, right),
- Expression.Constant(0)
- );
- }
- return Expression.GreaterThan(left, right);
- }
- Expression GenerateGreaterThanEqual(Expression left, Expression right)
- {
- if (left.Type == typeof(string))
- {
- return Expression.GreaterThanOrEqual(
- GenerateStaticMethodCall("Compare", left, right),
- Expression.Constant(0)
- );
- }
- return Expression.GreaterThanOrEqual(left, right);
- }
- Expression GenerateLessThan(Expression left, Expression right)
- {
- if (left.Type == typeof(string))
- {
- return Expression.LessThan(
- GenerateStaticMethodCall("Compare", left, right),
- Expression.Constant(0)
- );
- }
- return Expression.LessThan(left, right);
- }
- Expression GenerateLessThanEqual(Expression left, Expression right)
- {
- if (left.Type == typeof(string))
- {
- return Expression.LessThanOrEqual(
- GenerateStaticMethodCall("Compare", left, right),
- Expression.Constant(0)
- );
- }
- return Expression.LessThanOrEqual(left, right);
- }
- Expression GenerateAdd(Expression left, Expression right)
- {
- if (left.Type == typeof(string) && right.Type == typeof(string))
- {
- return GenerateStaticMethodCall("Concat", left, right);
- }
- return Expression.Add(left, right);
- }
- Expression GenerateSubtract(Expression left, Expression right)
- {
- return Expression.Subtract(left, right);
- }
- Expression GenerateStringConcat(Expression left, Expression right)
- {
- return Expression.Call(
- null,
- typeof(string).GetMethod("Concat", new[] { typeof(object), typeof(object) }),
- new[] { left, right });
- }
- MethodInfo GetStaticMethod(string methodName, Expression left, Expression right)
- {
- return left.Type.GetMethod(methodName, new[] { left.Type, right.Type });
- }
- Expression GenerateStaticMethodCall(string methodName, Expression left, Expression right)
- {
- return Expression.Call(null, GetStaticMethod(methodName, left, right), new[] { left, right });
- }
- void SetTextPos(int pos)
- {
- textPos = pos;
- ch = textPos < textLen ? text[textPos] : '\0';
- }
- void NextChar()
- {
- if (textPos < textLen) textPos++;
- ch = textPos < textLen ? text[textPos] : '\0';
- }
- void NextToken()
- {
- while (Char.IsWhiteSpace(ch)) NextChar();
- TokenId t;
- int tokenPos = textPos;
- switch (ch)
- {
- case '!':
- NextChar();
- if (ch == '=')
- {
- NextChar();
- t = TokenId.ExclamationEqual;
- }
- else
- {
- t = TokenId.Exclamation;
- }
- break;
- case '%':
- NextChar();
- t = TokenId.Percent;
- break;
- case '&':
- NextChar();
- if (ch == '&')
- {
- NextChar();
- t = TokenId.DoubleAmphersand;
- }
- else
- {
- t = TokenId.Amphersand;
- }
- break;
- case '(':
- NextChar();
- t = TokenId.OpenParen;
- break;
- case ')':
- NextChar();
- t = TokenId.CloseParen;
- break;
- case '*':
- NextChar();
- t = TokenId.Asterisk;
- break;
- case '+':
- NextChar();
- t = TokenId.Plus;
- break;
- case ',':
- NextChar();
- t = TokenId.Comma;
- break;
- case '-':
- NextChar();
- t = TokenId.Minus;
- break;
- case '.':
- NextChar();
- t = TokenId.Dot;
- break;
- case '/':
- NextChar();
- t = TokenId.Slash;
- break;
- case ':':
- NextChar();
- t = TokenId.Colon;
- break;
- case '<':
- NextChar();
- if (ch == '=')
- {
- NextChar();
- t = TokenId.LessThanEqual;
- }
- else if (ch == '>')
- {
- NextChar();
- t = TokenId.LessGreater;
- }
- else
- {
- t = TokenId.LessThan;
- }
- break;
- case '=':
- NextChar();
- if (ch == '=')
- {
- NextChar();
- t = TokenId.DoubleEqual;
- }
- else
- {
- t = TokenId.Equal;
- }
- break;
- case '>':
- NextChar();
- if (ch == '=')
- {
- NextChar();
- t = TokenId.GreaterThanEqual;
- }
- else
- {
- t = TokenId.GreaterThan;
- }
- break;
- case '?':
- NextChar();
- t = TokenId.Question;
- break;
- case '[':
- NextChar();
- t = TokenId.OpenBracket;
- break;
- case ']':
- NextChar();
- t = TokenId.CloseBracket;
- break;
- case '|':
- NextChar();
- if (ch == '|')
- {
- NextChar();
- t = TokenId.DoubleBar;
- }
- else
- {
- t = TokenId.Bar;
- }
- break;
- case '"':
- case '\'':
- char quote = ch;
- do
- {
- NextChar();
- while (textPos < textLen && ch != quote) NextChar();
- if (textPos == textLen)
- throw ParseError(textPos, Res.UnterminatedStringLiteral);
- NextChar();
- } while (ch == quote);
- t = TokenId.StringLiteral;
- break;
- default:
- if (Char.IsLetter(ch) || ch == '@' || ch == '_')
- {
- do
- {
- NextChar();
- } while (Char.IsLetterOrDigit(ch) || ch == '_');
- t = TokenId.Identifier;
- break;
- }
- if (Char.IsDigit(ch))
- {
- t = TokenId.IntegerLiteral;
- do
- {
- NextChar();
- } while (Char.IsDigit(ch));
- if (ch == '.')
- {
- t = TokenId.RealLiteral;
- NextChar();
- ValidateDigit();
- do
- {
- NextChar();
- } while (Char.IsDigit(ch));
- }
- if (ch == 'E' || ch == 'e')
- {
- t = TokenId.RealLiteral;
- NextChar();
- if (ch == '+' || ch == '-') NextChar();
- ValidateDigit();
- do
- {
- NextChar();
- } while (Char.IsDigit(ch));
- }
- if (ch == 'F' || ch == 'f') NextChar();
- break;
- }
- if (textPos == textLen)
- {
- t = TokenId.End;
- break;
- }
- throw ParseError(textPos, Res.InvalidCharacter, ch);
- }
- token.id = t;
- token.text = text.Substring(tokenPos, textPos - tokenPos);
- token.pos = tokenPos;
- }
- bool TokenIdentifierIs(string id)
- {
- return token.id == TokenId.Identifier && String.Equals(id, token.text, StringComparison.OrdinalIgnoreCase);
- }
- string GetIdentifier()
- {
- ValidateToken(TokenId.Identifier, Res.IdentifierExpected);
- string id = token.text;
- if (id.Length > 1 && id[0] == '@') id = id.Substring(1);
- return id;
- }
- void ValidateDigit()
- {
- if (!Char.IsDigit(ch)) throw ParseError(textPos, Res.DigitExpected);
- }
- void ValidateToken(TokenId t, string errorMessage)
- {
- if (token.id != t) throw ParseError(errorMessage);
- }
- void ValidateToken(TokenId t)
- {
- if (token.id != t) throw ParseError(Res.SyntaxError);
- }
- Exception ParseError(string format, params object[] args)
- {
- return ParseError(token.pos, format, args);
- }
- Exception ParseError(int pos, string format, params object[] args)
- {
- return new ParseException(string.Format(System.Globalization.CultureInfo.CurrentCulture, format, args), pos);
- }
- static Dictionary<string, object> CreateKeywords()
- {
- Dictionary<string, object> d = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
- d.Add("true", trueLiteral);
- d.Add("false", falseLiteral);
- d.Add("null", nullLiteral);
- d.Add(keywordIt, keywordIt);
- d.Add(keywordIif, keywordIif);
- d.Add(keywordNew, keywordNew);
- foreach (Type type in predefinedTypes) d.Add(type.Name, type);
- return d;
- }
- }
- static class Res
- {
- public const string DuplicateIdentifier = "The identifier '{0}' was defined more than once";
- public const string ExpressionTypeMismatch = "Expression of type '{0}' expected";
- public const string ExpressionExpected = "Expression expected";
- public const string InvalidCharacterLiteral = "Character literal must contain exactly one character";
- public const string InvalidIntegerLiteral = "Invalid integer literal '{0}'";
- public const string InvalidRealLiteral = "Invalid real literal '{0}'";
- public const string UnknownIdentifier = "Unknown identifier '{0}'";
- public const string NoItInScope = "No 'it' is in scope";
- public const string IifRequiresThreeArgs = "The 'iif' function requires three arguments";
- public const string FirstExprMustBeBool = "The first expression must be of type 'Boolean'";
- public const string BothTypesConvertToOther = "Both of the types '{0}' and '{1}' convert to the other";
- public const string NeitherTypeConvertsToOther = "Neither of the types '{0}' and '{1}' converts to the other";
- public const string MissingAsClause = "Expression is missing an 'as' clause";
- public const string ArgsIncompatibleWithLambda = "Argument list incompatible with lambda expression";
- public const string TypeHasNoNullableForm = "Type '{0}' has no nullable form";
- public const string NoMatchingConstructor = "No matching constructor in type '{0}'";
- public const string AmbiguousConstructorInvocation = "Ambiguous invocation of '{0}' constructor";
- public const string CannotConvertValue = "A value of type '{0}' cannot be converted to type '{1}'";
- public const string NoApplicableMethod = "No applicable method '{0}' exists in type '{1}'";
- public const string MethodsAreInaccessible = "Methods on type '{0}' are not accessible";
- public const string MethodIsVoid = "Method '{0}' in type '{1}' does not return a value";
- public const string AmbiguousMethodInvocation = "Ambiguous invocation of method '{0}' in type '{1}'";
- public const string UnknownPropertyOrField = "No property or field '{0}' exists in type '{1}'";
- public const string NoApplicableAggregate = "No applicable aggregate method '{0}' exists";
- public const string CannotIndexMultiDimArray = "Indexing of multi-dimensional arrays is not supported";
- public const string InvalidIndex = "Array index must be an integer expression";
- public const string NoApplicableIndexer = "No applicable indexer exists in type '{0}'";
- public const string AmbiguousIndexerInvocation = "Ambiguous invocation of indexer in type '{0}'";
- public const string IncompatibleOperand = "Operator '{0}' incompatible with operand type '{1}'";
- public const string IncompatibleOperands = "Operator '{0}' incompatible with operand types '{1}' and '{2}'";
- public const string UnterminatedStringLiteral = "Unterminated string literal";
- public const string InvalidCharacter = "Syntax error '{0}'";
- public const string DigitExpected = "Digit expected";
- public const string SyntaxError = "Syntax error";
- public const string TokenExpected = "{0} expected";
- public const string ParseExceptionFormat = "{0} (at index {1})";
- public const string ColonExpected = "':' expected";
- public const string OpenParenExpected = "'(' expected";
- public const string CloseParenOrOperatorExpected = "')' or operator expected";
- public const string CloseParenOrCommaExpected = "')' or ',' expected";
- public const string DotOrOpenParenExpected = "'.' or '(' expected";
- public const string OpenBracketExpected = "'[' expected";
- public const string CloseBracketOrCommaExpected = "']' or ',' expected";
- public const string IdentifierExpected = "Identifier expected";
- }
- }
- /* Test Code
- namespace Dynamic
- {
- class Program
- {
- static void Main(string[] args)
- {
- // For this sample to work, you need an active database server or SqlExpress.
- // Here is a connection to the Data sample project that ships with Microsoft Visual Studio 2008.
- string dbPath = Path.GetFullPath(Path.Combine(Application.StartupPath, @"..\..\..\..\Data\NORTHWND.MDF"));
- string sqlServerInstance = @".\SQLEXPRESS";
- string connString = "AttachDBFileName='" + dbPath + "';Server='" + sqlServerInstance + "';user instance=true;Integrated Security=SSPI;Connection Timeout=60";
- // Here is an alternate connect string that you can modify for your own purposes.
- // string connString = "server=test;database=northwind;user id=test;password=test";
- Northwind db = new Northwind(connString);
- db.Log = Console.Out;
- var query =
- db.Customers.Where("City == @0 and Orders.Count >= @1", "London", 10).
- OrderBy("CompanyName").
- Select("New(CompanyName as Name, Phone)");
- Console.WriteLine(query);
- Console.ReadLine();
- }
- }
- }
- }*/
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