private static void AppendValue(Context context, Expression prop, UriToken token)
{
Type actualType = Nullable(prop.Type);
MethodInfo formattableMethod = actualType == prop.Type
? MethodOfTemplateCompiler_ToStringFormattable
: MethodOfTemplateCompiler_NullableToStringFormattable;
MethodInfo toStringMethod = actualType == prop.Type
? MethodOfTemplateCompiler_ToString
: MethodOfTemplateCompiler_NullableToString;
Expression toString;
if (TypeofIFormattable.IsAssignableFrom(actualType))
{
MethodInfo method = formattableMethod.MakeGenericMethod(actualType);
toString = Expression.Call(null, method, prop, token.FormatConstant, token.DefaultConstant);
}
else
{
MethodInfo method = toStringMethod.MakeGenericMethod(actualType);
toString = Expression.Call(null, method, prop, token.DefaultConstant);
}
toString = Expression.Call(QueryBuilder, MethodofUrlBuilder_Append, toString);
context.Add(toString);
}
private static void AppendQuery(Context context, UriQuery query)
{
if (query.Value.Count == 1 && query.Value[0].Type != UriTokenType.Literal)
{
UriToken value = query.Value[0];
MemberExpression prop = Expression.PropertyOrField(context.Target, value.Name);
Type propType = Nullable(prop.Type);
if (value.Type == UriTokenType.Collection)
{
MethodInfo getEnumerator = Enumerator(propType);
if (getEnumerator != null)
{
AppendCollection(context, prop, getEnumerator, query.Name, value);
}
else
{
throw new InvalidOperationException(Invariant($"An enumerable was expected for {value.Name}."));
}
return;
}
if (value.SubName != null)
{
if (propType.IsEnum)
{
AppendEnum(context, prop, query.Name, value);
}
else
{
throw new InvalidOperationException(Invariant($"An enum was expected for {value.Name}."));
}
return;
}
if (value.Default == null)
{
AppendNullable(context, prop, query.Name, value);
return;
}
}
context.Add(Expression.Call(QueryBuilder, MethodofUrlBuilder_StartParameter));
for (var i = 0; i < query.Name.Count; i++)
{
AppendToken(context, query.Name[i]);
}
context.Add(Expression.Call(QueryBuilder, MethodofUrlBuilder_StartValue));
for (var i = 0; i < query.Value.Count; i++)
{
AppendToken(context, query.Value[i]);
}
}
private static void AppendToken(Context context, UriToken token)
{
if (token.Type == UriTokenType.Literal)
{
context.Add(Expression.Call(QueryBuilder, MethodofUrlBuilder_Append, token.DefaultConstant));
}
else
{
Expression prop = Expression.PropertyOrField(context.Target, token.Name);
AppendValue(context, prop, token);
}
}
private static void AppendCollection(Context context, MemberExpression prop, MethodInfo getEnumerator, IReadOnlyList <UriToken> name, UriToken value)
{
Expression nonNull = Nullable(prop);
MethodCallExpression createEnumerator = Expression.Call(nonNull, getEnumerator, null);
ParameterExpression enumerator = context.Add(createEnumerator.Type, "e");
MemberExpression current = Expression.Property(enumerator, nameof(System.Collections.IEnumerator.Current));
MethodCallExpression moveNext = Expression.Call(enumerator, MethodofIEnumerator_MoveNext, null);
List <Expression> statements = StartQueryParameter(context, name);
AppendValue(context.With(statements), current, value);
LabelTarget brk = Expression.Label("Exit " + prop.Member.Name);
LoopExpression loop = Expression.Loop(
Expression.IfThenElse(
moveNext,
Expression.Block(statements),
Expression.Break(brk)),
brk
);
TryExpression t = Expression.TryFinally(
Expression.Block(
Expression.Assign(enumerator, createEnumerator),
loop),
Expression.Call(enumerator, MethodofIDisposable_Dispose)
);
context.Add(IsNull(prop, t));
}
private static void AppendEnum(Context context, MemberExpression prop, IReadOnlyList <UriToken> name, UriToken value)
{
Expression nonNull = Nullable(prop);
var isFlags = nonNull.Type.GetCustomAttribute <FlagsAttribute>() != null;
ConstantExpression enumMember = Expression.Constant(Enum.Parse(nonNull.Type, value.SubName));
List <Expression> statements = StartQueryParameter(context, name);
if (value.Default != null)
{
statements.Add(Expression.Call(QueryBuilder, MethodofUrlBuilder_Append, value.DefaultConstant));
}
Expression condition = isFlags
? (Expression)Expression.Call(enumMember, MethodofEnum_HasFlag, Expression.Convert(enumMember, TypeofEnum))
: Expression.Equal(nonNull, enumMember);
condition = Expression.IfThen(condition, Expression.Block(statements));
context.Add(IsNull(prop, condition));
}
private static void AppendNullable(Context context, MemberExpression prop, IReadOnlyList <UriToken> name, UriToken value)
{
List <Expression> statements = StartQueryParameter(context, name);
AppendValue(context.With(statements), prop, value);
context.Add(IsNull(prop, Expression.Block(statements)));
}