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/++
Base reflection utilities.
License: $(HTTP www.apache.org/licenses/LICENSE-2.0, Apache-2.0)
Authors: Ilia Ki
Macros:
+/
module mir.reflection;
import std.meta;
import std.traits: Parameters, isSomeFunction, FunctionAttribute, functionAttributes, EnumMembers, isAggregateType;
import mir.internal.meta: hasUDA, getUDAs;
import mir.functional: Tuple;
import mir.exception: toMutable;
deprecated
package alias isSomeStruct = isAggregateType;
/++
Attribute to force member serialization for static fields, compiletime `enum` members and non-property methods.
+/
enum reflectSerde;
/++
Match types like `std.typeconst: Nullable`.
+/
template isStdNullable(T)
{
import std.traits : hasMember;
private __gshared T* aggregate;
enum bool isStdNullable =
hasMember!(T, "isNull") &&
hasMember!(T, "get") &&
hasMember!(T, "nullify") &&
is(typeof(__traits(getMember, aggregate, "isNull")()) == bool) &&
!is(typeof(__traits(getMember, aggregate, "get")()) == void) &&
is(typeof(__traits(getMember, aggregate, "nullify")()) == void);
}
///
version(mir_core_test) unittest
{
import std.typecons;
static assert(isStdNullable!(Nullable!double));
}
///
version(mir_core_test) unittest
{
import mir.algebraic;
static assert(isStdNullable!(Nullable!double));
}
/// Attribute for deprecated API
struct reflectDeprecated(string target)
{
///
string msg;
/++
Number in an issue tracker. Not mandatory.
+/
uint issueNumber = uint.max;
/++
Should be kind of version number if one can be given.
Can be something else if that's not possible. Not mandatory.
+/
string removalTime;
}
/// Attribute to rename methods, types and functions
template ReflectName(string target)
{
///
struct ReflectName(Args...)
{
///
string name;
}
}
/// ditto
template reflectName(string target = null, Args...)
{
///
auto reflectName(string name)
{
alias TargetName = ReflectName!target;
return TargetName!Args(name);
}
}
///
version(mir_core_test) unittest
{
enum E { A, B, C }
struct S
{
@reflectName("A")
int a;
@reflectName!"c++"("B")
int b;
@reflectName!("C", double)("cd")
@reflectName!("C", float)("cf")
F c(F)()
{
return b;
}
}
import std.traits: hasUDA;
alias UniName = ReflectName!null;
alias CppName = ReflectName!"c++";
alias CName = ReflectName!"C";
static assert(hasUDA!(S.a, UniName!()("A")));
static assert(hasUDA!(S.b, CppName!()("B")));
// static assert(hasUDA!(S.c, ReflectName)); // doesn't work for now
static assert(hasUDA!(S.c, CName));
static assert(hasUDA!(S.c, CName!double));
static assert(hasUDA!(S.c, CName!float));
static assert(hasUDA!(S.c, CName!double("cd")));
static assert(hasUDA!(S.c, CName!float("cf")));
}
/// Attribute to rename methods, types and functions
template ReflectMeta(string target, string[] fields)
{
///
struct ReflectMeta(Args...)
{
///
Args args;
static foreach(i, field; fields)
mixin(`alias ` ~ field ~` = args[` ~ i.stringof ~`];`);
}
}
/// ditto
template reflectMeta(string target, string[] fields)
{
///
auto reflectMeta(Args...)(Args args)
if (args.length <= fields.length)
{
alias TargetMeta = ReflectMeta!(target, fields);
return TargetMeta!Args(args);
}
}
///
version(mir_core_test) unittest
{
enum E { A, B, C }
struct S
{
int a;
@reflectMeta!("c++", ["type"])(E.C)
int b;
}
import std.traits: hasUDA;
alias CppMeta = ReflectMeta!("c++", ["type"]);
static assert(CppMeta!E(E.C).type == E.C);
static assert(!hasUDA!(S.a, CppMeta!E(E.A)));
static assert(hasUDA!(S.b, CppMeta!E(E.C)));
}
/++
Attribute to ignore a reflection target
+/
template reflectIgnore(string target)
{
enum reflectIgnore;
}
///
version(mir_core_test) unittest
{
struct S
{
@reflectIgnore!"c++"
int a;
}
import std.traits: hasUDA;
static assert(hasUDA!(S.a, reflectIgnore!"c++"));
}
/// Attribute for documentation and unittests
struct ReflectDoc(string target)
{
///
string text;
///
reflectUnittest!target test;
///
@safe pure nothrow @nogc
this(string text)
{
this.text = text;
}
///
@safe pure nothrow @nogc
this(string text, reflectUnittest!target test)
{
this.text = text;
this.test = test;
}
///
void toString(W)(scope ref W w) scope const
{
w.put(cast()this.text);
if (this.test.text.length)
{
w.put("\nExample usage:\n");
w.put(cast()this.test.text);
}
}
///
@safe pure nothrow
string toString()() scope const
{
return this.text ~ "\nExample usage:\n" ~ this.test.text;
}
}
/++
Attribute for documentation.
+/
template reflectDoc(string target = null)
{
///
ReflectDoc!target reflectDoc(string text)
{
return ReflectDoc!target(text);
}
///
ReflectDoc!target reflectDoc(string text, reflectUnittest!target test)
{
return ReflectDoc!target(text, test);
}
}
/++
+/
template reflectGetDocs(string target, alias symbol)
{
static if (hasUDA!(symbol, ReflectDoc!target))
static immutable(ReflectDoc!target[]) reflectGetDocs = [getUDAs!(symbol, ReflectDoc!target)];
else
static immutable(ReflectDoc!target[]) reflectGetDocs = null;
}
/// ditto
template reflectGetDocs(string target)
{
///
alias reflectGetDocs(alias symbol) = .reflectGetDocs!(target, symbol);
/// ditto
immutable(ReflectDoc!target)[] reflectGetDocs(T)(T value)
@safe pure nothrow @nogc
if (is(T == enum))
{
foreach (i, member; EnumMembers!T)
{{
alias all = __traits(getAttributes, EnumMembers!T[i]);
}}
static immutable ReflectDoc!target[][EnumMembers!T.length] docs = [staticMap!(reflectGetDocs, EnumMembers!T)];
import mir.enums: getEnumIndex;
uint index = void;
if (getEnumIndex(value, index))
return docs[index];
assert(0);
}
}
///
version(mir_core_test) unittest
{
enum E
{
@reflectDoc("alpha")
a,
@reflectDoc!"C#"("Beta", reflectUnittest!"C#"("some c# code"))
@reflectDoc("beta")
b,
c,
}
alias Doc = ReflectDoc!null;
alias CSDoc = ReflectDoc!"C#";
static assert(reflectGetDocs!null(E.a) == [Doc("alpha")]);
static assert(reflectGetDocs!"C#"(E.b) == [CSDoc("Beta", reflectUnittest!"C#"("some c# code"))]);
static assert(reflectGetDocs!null(E.b) == [Doc("beta")]);
static assert(reflectGetDocs!null(E.c) is null);
struct S
{
@reflectDoc("alpha")
@reflectDoc!"C#"("Alpha")
int a;
}
static assert(reflectGetDocs!(null, S.a) == [Doc("alpha")]);
static assert(reflectGetDocs!("C#", S.a) == [CSDoc("Alpha")]);
import std.conv: to;
static assert(CSDoc("Beta", reflectUnittest!"C#"("some c# code")).to!string == "Beta\nExample usage:\nsome c# code");
}
/++
Attribute for extern unit-test.
+/
struct reflectUnittest(string target)
{
///
string text;
@safe pure nothrow @nogc:
this(string text)
{
this.text = text;
}
this(const typeof(this) other)
{
this.text = other.text;
}
}
/++
+/
template reflectGetUnittest(string target, alias symbol)
{
static if (hasUDA!(symbol, reflectUnittest!target))
enum string reflectGetUnittest = getUDA!(symbol, reflectUnittest).text;
else
enum string reflectGetUnittest = null;
}
/// ditto
template reflectGetUnittest(string target)
{
///
alias reflectGetUnittest(alias symbol) = .reflectGetUnittest!(target, symbol);
///
string reflectGetUnittest(T)(T value)
if (is(T == enum))
{
foreach (i, member; EnumMembers!T)
{{
alias all = __traits(getAttributes, EnumMembers!T[i]);
}}
static immutable string[EnumMembers!T.length] tests = [staticMap!(reflectGetUnittest, EnumMembers!T)];
import mir.enums: getEnumIndex;
uint index = void;
if (getEnumIndex(value, index))
return tests[index];
assert(0);
}
}
///
version(mir_core_test) unittest
{
enum E
{
@reflectUnittest!"c++"("assert(E::a == 0);")
a,
@reflectUnittest!"c++"("assert(E::b == 1);")
b,
c,
}
static assert(reflectGetUnittest!"c++"(E.a) == "assert(E::a == 0);");
static assert(reflectGetUnittest!"c++"(E.b) == "assert(E::b == 1);");
static assert(reflectGetUnittest!"c++"(E.c) is null);
struct S
{
@reflectUnittest!"c++"("alpha")
int a;
}
static assert(reflectGetUnittest!("c++", S.a) == "alpha");
}
/++
Returns: single UDA.
+/
template getUDA(alias symbol, alias attribute)
{
private alias all = getUDAs!(symbol, attribute);
static if (all.length != 1)
static assert(0, "Exactly one " ~ attribute.stringof ~ " attribute is required, " ~ "got " ~ all.length.stringof);
else
{
static if (is(typeof(all[0])))
enum getUDA = all[0];
else
alias getUDA = all[0];
}
}
/// ditto
template getUDA(T, string member, alias attribute)
{
private alias all = getUDAs!(T, member, attribute);
static if (all.length != 1)
static assert(0, "Exactly one " ~ attribute.stringof ~ " attribute is required, " ~ "got " ~ all.length.stringof);
else
{
static if (is(typeof(all[0])))
enum getUDA = all[0];
else
alias getUDA = all[0];
}
}
/++
Checks if T has a field member.
+/
enum bool isOriginalMember(T, string member) = __traits(identifier, __traits(getMember, T, member)) == member;
///
version(mir_core_test) unittest
{
struct D
{
int a;
alias b = a;
}
static assert(isOriginalMember!(D, "a"));
static assert(!isOriginalMember!(D, "b"));
}
/++
Checks if T has a field member.
+/
enum bool hasField(T, string member) = __traits(compiles, (ref T aggregate) { return __traits(getMember, aggregate, member).offsetof; });
deprecated("use 'hasField' instead") alias isField = hasField;
///
version(mir_core_test) unittest
{
struct D
{
int gi;
}
struct I
{
int f;
D base;
alias base this;
void gi(double ) @property {}
void gi(uint ) @property {}
}
struct S
{
int d;
I i;
alias i this;
int gm() @property {return 0;}
int gc() const @property {return 0;}
void gs(int) @property {}
}
static assert(!hasField!(S, "gi"));
static assert(!hasField!(S, "gs"));
static assert(!hasField!(S, "gc"));
static assert(!hasField!(S, "gm"));
static assert(!hasField!(S, "gi"));
static assert(hasField!(S, "d"));
static assert(hasField!(S, "f"));
static assert(hasField!(S, "i"));
}
/// with classes
version(mir_core_test) unittest
{
class I
{
int f;
void gi(double ) @property {}
void gi(uint ) @property {}
}
class S
{
int d;
I i;
alias i this;
int gm() @property {return 0;}
int gc() const @property {return 0;}
void gs(int) @property {}
}
static assert(!hasField!(S, "gi"));
static assert(!hasField!(S, "gs"));
static assert(!hasField!(S, "gc"));
static assert(!hasField!(S, "gm"));
static assert(hasField!(S, "d"));
static assert(hasField!(S, "f"));
static assert(hasField!(S, "i"));
}
/++
Checks if member is property.
+/
template isProperty(T, string member)
{
private __gshared T* aggregate;
static if (__traits(compiles, isSomeFunction!(__traits(getMember, *aggregate, member))))
{
static if (isSomeFunction!(__traits(getMember, *aggregate, member)))
{
enum bool isProperty = isPropertyImpl!(__traits(getMember, *aggregate, member));
}
else
{
enum bool isProperty = false;
}
}
else
enum bool isProperty = false;
}
///
version(mir_core_test) unittest
{
struct D
{
int y;
void gf(double ) @property {}
void gf(uint ) @property {}
}
struct I
{
int f;
D base;
alias base this;
void gi(double ) @property {}
void gi(uint ) @property {}
}
struct S
{
int d;
I i;
alias i this;
int gm() @property {return 0;}
int gc() const @property {return 0;}
void gs(int) @property {}
}
static assert(isProperty!(S, "gf"));
static assert(isProperty!(S, "gi"));
static assert(isProperty!(S, "gs"));
static assert(isProperty!(S, "gc"));
static assert(isProperty!(S, "gm"));
static assert(!isProperty!(S, "d"));
static assert(!isProperty!(S, "f"));
static assert(!isProperty!(S, "y"));
}
version(mir_core_test) unittest
{
struct S
{
@reflectSerde enum s = "str";
enum t = "str";
}
static assert(hasUDA!(S, "s", reflectSerde));
static assert(!hasUDA!(S, "t", reflectSerde));
}
/++
Returns: list of the setter properties.
Note: The implementation ignores templates.
+/
template getSetters(T, string member)
{
static if (__traits(hasMember, T, member))
alias getSetters = Filter!(hasSingleArgument, Filter!(isPropertyImpl, __traits(getOverloads, T, member, true)));
else
alias getSetters = AliasSeq!();
}
///
version(mir_core_test) unittest
{
struct I
{
int f;
void gi(double ) @property {}
void gi(uint ) @property {}
}
struct S
{
int d;
I i;
alias i this;
int gm() @property {return 0;}
int gc() const @property {return 0;}
void gs(int) @property {}
}
static assert(getSetters!(S, "gi").length == 2);
static assert(getSetters!(S, "gs").length == 1);
static assert(getSetters!(S, "gc").length == 0);
static assert(getSetters!(S, "gm").length == 0);
static assert(getSetters!(S, "d").length == 0);
static assert(getSetters!(S, "f").length == 0);
}
/++
Returns: list of the serializable (public getters) members.
+/
enum string[] SerializableMembers(T) = [Filter!(ApplyLeft!(Serializable, T), SerdeFieldsAndProperties!T)];
///
version(mir_core_test) unittest
{
struct D
{
int y;
int gf() @property {return 0;}
}
struct I
{
int f;
D base;
alias base this;
int gi() @property {return 0;}
}
struct S
{
int d;
package int p;
enum s = "str";
@reflectSerde enum t = "str";
int gm() @property {return 0;}
private int q;
I i;
alias i this;
int gc() const @property {return 0;}
void gs(int) @property {}
}
static assert(SerializableMembers!S == ["y", "gf", "f", "gi", "d", "t", "gm", "gc"]);
static assert(SerializableMembers!(const S) == ["y", "f", "d", "t", "gc"]);
}
/++
Returns: list of the deserializable (public setters) members.
+/
enum string[] DeserializableMembers(T) = [Filter!(ApplyLeft!(Deserializable, T), SerdeFieldsAndProperties!T)];
///
version(mir_core_test) unittest
{
struct I
{
int f;
void ga(int) @property {}
}
struct S
{
int d;
package int p;
int gm() @property {return 0;}
void gm(int) @property {}
private int q;
I i;
alias i this;
void gc(int, int) @property {}
void gc(int) @property {}
}
S s;
// s.gc(0);
static assert (DeserializableMembers!S == ["f", "ga", "d", "gm", "gc"]);
static assert (DeserializableMembers!(const S) == []);
}
// This trait defines what members should be serialized -
// public members that are either readable and writable or getter properties
private template Serializable(T, string member)
{
static if (!isPublic!(T, member))
enum Serializable = false;
else
enum Serializable = isReadable!(T, member); // any readable is good
}
private enum bool hasSingleArgument(alias fun) = Parameters!fun.length == 1;
private enum bool hasZeroArguments(alias fun) = Parameters!fun.length == 0;
// This trait defines what members should be serialized -
// public members that are either readable and writable or setter properties
private template Deserializable(T, string member)
{
static if (!isPublic!(T, member))
enum Deserializable = false;
else
static if (isReadableAndWritable!(T, member))
enum Deserializable = true;
else
static if (getSetters!(T, member).length == 1)
enum Deserializable = is(typeof((ref T val){ __traits(getMember, val, member) = Parameters!(getSetters!(T, member)[0])[0].init; }));
else
enum Deserializable = false;
}
private enum SerdeFieldsAndProperties(T) = Reverse!(NoDuplicates!(Reverse!(SerdeFieldsAndPropertiesImpl!T)));
private static immutable exlMembers = [
"opAssign",
"opCast",
"opCmp",
"opEquals",
"opPostMove",
"toHash",
"toString",
"trustedGet",
"deserializeFromAsdf",
"deserializeFromIon",
];
private auto filterMembers(string[] members)
{
string[] ret;
L: foreach(member; members)
{
if (member.length >= 2 && (member[0 .. 2] == "__" || member[$ - 2 .. $] == "__"))
continue;
foreach(exlMember; exlMembers)
if (exlMember == member)
continue L;
ret ~= member;
}
return ret;
};
private template allMembers(T)
{
import std.meta: aliasSeqOf;
static if (isAggregateType!T)
alias allMembers = aliasSeqOf!(filterMembers([__traits(allMembers, T)]));
else
alias allMembers = AliasSeq!();
}
private template SerdeFieldsAndPropertiesImpl(T)
{
alias isProperty = ApplyLeft!(.isProperty, T);
alias hasField = ApplyLeft!(.hasField, T);
alias isOriginalMember = ApplyLeft!(.isOriginalMember, T);
private __gshared T* aggregate;
template hasReflectSerde(string member)
{
static if (is(typeof(__traits(getMember, *aggregate, member))))
enum hasReflectSerde = hasUDA!(T, member, reflectSerde);
else
enum hasReflectSerde = false;
}
alias isMember = templateAnd!(templateOr!(hasField, isProperty, hasReflectSerde), isOriginalMember);
static if (!is(immutable T == Tuple!Types, Types...) && __traits(getAliasThis, T).length)
{
alias A = typeof(__traits(getMember, aggregate, __traits(getAliasThis, T)));
static if (isAggregateType!T)
alias baseMembers = SerdeFieldsAndPropertiesImpl!A;
else
alias baseMembers = AliasSeq!();
alias members = Erase!(__traits(getAliasThis, T)[0], __traits(allMembers, T));
alias SerdeFieldsAndPropertiesImpl = AliasSeq!(baseMembers, Filter!(isMember, members));
}
else
{
import mir.algebraic;
static if (isVariant!T)
alias members = staticMap!(allMembers, T.AllowedTypes);
else
alias members = allMembers!T;
alias SerdeFieldsAndPropertiesImpl = AliasSeq!(Filter!(isMember, members));
}
}
// check if the member is readable
private template isReadable(T, string member)
{
private __gshared T* aggregate;
enum bool isReadable = __traits(compiles, { static fun(T)(auto ref T t) {} fun(__traits(getMember, *aggregate, member)); });
}
// check if the member is readable/writeble?
private template isReadableAndWritable(T, string member)
{
private __gshared T* aggregate;
enum bool isReadableAndWritable = __traits(compiles, __traits(getMember, *aggregate, member) = __traits(getMember, *aggregate, member));
}
package template isPublic(T, string member)
{
private __gshared T* aggregate;
static if (__traits(compiles, { auto _ = __traits(getProtection, __traits(getMember, *aggregate, member)); }))
enum bool isPublic = !__traits(getProtection, __traits(getMember, *aggregate, member)).privateOrPackage;
else
enum bool isPublic = false;
}
version(unittest)
{
final class ZipArchive
{
public:
static const ushort zip64ExtractVersion = 45;
}
}
version (mir_core_test) @nogc nothrow pure @safe unittest
{
static assert(!isPublic!(ZipArchive, "zip64ExtractVersion"));
}
// check if the member is property
private template isSetter(T, string member)
{
private __gshared T* aggregate;
static if (__traits(compiles, isSomeFunction!(__traits(getMember, *aggregate, member))))
{
static if (isSomeFunction!(__traits(getMember, *aggregate, member)))
{
enum bool isSetter = getSetters!(T, member).length > 0;;
}
else
{
enum bool isSetter = false;
}
}
else
enum bool isSetter = false;
}
private template isGetter(T, string member)
{
private __gshared T* aggregate;
static if (__traits(compiles, isSomeFunction!(__traits(getMember, *aggregate, member))))
{
static if (isSomeFunction!(__traits(getMember, *aggregate, member)))
{
enum bool isGetter = Filter!(hasZeroArguments, Filter!(isPropertyImpl, __traits(getOverloads, T, member, true))).length == 1;
}
else
{
enum bool isGetter = false;
}
}
else
enum bool isGetter = false;
}
private enum bool isPropertyImpl(alias member) = (functionAttributes!member & FunctionAttribute.property) != 0;
private bool privateOrPackage()(string protection)
{
return protection == "private" || protection == "package";
}
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