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jsvar.d
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jsvar.d
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/*
FIXME:
pointer to member functions can give a way to wrap things
we'll pass it an opaque object as this and it will unpack and call the method
we can also auto-generate getters and setters for properties with this method
and constructors, so the script can create class objects too
*/
/**
jsvar provides a D type called 'var' that works similarly to the same in Javascript.
It is weakly and dynamically typed, but interops pretty easily with D itself:
var a = 10;
a ~= "20";
assert(a == "1020");
var a = function(int b, int c) { return b+c; };
// note the second set of () is because of broken @property
assert(a()(10,20) == 30);
var a = var.emptyObject;
a.foo = 30;
assert(a["foo"] == 30);
var b = json!q{
"foo":12,
"bar":{"hey":[1,2,3,"lol"]}
};
assert(b.bar.hey[1] == 2);
You can also use var.fromJson, a static method, to quickly and easily
read json or var.toJson to write it.
Also, if you combine this with my new arsd.script module, you get pretty
easy interop with a little scripting language that resembles a cross between
D and Javascript - just like you can write in D itself using this type.
Properties:
* note that @property doesn't work right in D, so the opDispatch properties
will require double parenthesis to call as functions.
* Properties inside a var itself are set specially:
obj.propName._object = new PropertyPrototype(getter, setter);
D structs can be turned to vars, but it is a copy.
Wrapping D native objects is coming later, the current ways suck. I really needed
properties to do them sanely at all, and now I have it. A native wrapped object will
also need to be set with _object prolly.
*/
module arsd.jsvar;
version=new_std_json;
import std.stdio;
import std.traits;
import std.conv;
import std.json;
// uda for wrapping classes
enum Scriptable;
/*
PrototypeObject FIXME:
make undefined variables reaction overloadable in PrototypeObject, not just a switch
script FIXME:
the Expression should keep scriptFilename and lineNumber around for error messages
it should consistently throw on missing semicolons
*) in operator
*) nesting comments, `` string literals
*) opDispatch overloading
*) properties???//
a.prop on the rhs => a.prop()
a.prop on the lhs => a.prop(rhs);
if opAssign, it can just do a.prop(a.prop().opBinary!op(rhs));
But, how do we mark properties in var? Can we make them work this way in D too?
0) add global functions to the object (or at least provide a convenience function to make a pre-populated global object)
1) ensure operator precedence is sane
2) a++ would prolly be nice, and def -a
4) switches?
10) __FILE__ and __LINE__ as default function arguments should work like in D
16) stack traces on script exceptions
17) an exception type that we can create in the script
14) import???????/ it could just attach a particular object to the local scope, and the module decl just giving the local scope a name
there could be a super-global object that is the prototype of the "global" used here
then you import, and it pulls moduleGlobal.prototype = superGlobal.modulename... or soemthing.
to get the vars out in D, you'd have to be aware of this, since you pass the superglobal
hmmm maybe not worth it
though maybe to export vars there could be an explicit export namespace or something.
6) gotos? labels? labeled break/continue?
18) what about something like ruby's blocks or macros? parsing foo(arg) { code } is easy enough, but how would we use it?
var FIXME:
user defined operator overloading on objects, including opCall, opApply, and more
flesh out prototype objects for Array, String, and Function
looserOpEquals
it would be nice if delegates on native types could work
*/
/*
Script notes:
the one type is var. It works just like the var type in D from arsd.jsvar.
(it might be fun to try to add other types, and match D a little better here! We could allow implicit conversion to and from var, but not on the other types, they could get static checking. But for now it is only var. BTW auto is an alias for var right now)
There is no comma operator, but you can use a scope as an expression: a++, b++; can be written as {a++;b++;}
*/
version(test_script)
struct Foop {
int a = 12;
string n = "hate";
void speak() { writeln(n, " ", a); n = "love"; writeln(n, " is what it is now"); }
void speak2() { writeln("speak2 ", n, " ", a); }
}
version(test_script)
void main() {
import arsd.script;
writeln(interpret("x*x + 3*x;", var(["x":3])));
{
var a = var.emptyObject;
a.qweq = 12;
}
// the WrappedNativeObject is disgusting
// but works. sort of.
/*
Foop foop2;
var foop;
foop._object = new WrappedNativeObject!Foop(foop2);
foop.speak()();
foop.a = 25;
writeln(foop.n);
foop.speak2()();
return;
*/
import arsd.script;
struct Test {
int a = 10;
string name = "ten";
}
auto globals = var.emptyObject;
globals.lol = 100;
globals.rofl = 23;
globals.arrtest = var.emptyArray;
globals.write._function = (var _this, var[] args) {
string s;
foreach(a; args)
s ~= a.get!string;
writeln("script said: ", s);
return var(null);
};
// call D defined functions in script
globals.func = (var a, var b) { writeln("Hello, world! You are : ", a, " and ", b); };
globals.ex = () { throw new ScriptRuntimeException("test", 1); };
globals.fun = { return var({ writeln("hello inside!"); }); };
import std.file;
writeln(interpret(readText("scripttest_code.d"), globals));
globals.ten = 10.0;
globals.five = 5.0;
writeln(interpret(q{
var a = json!q{ };
a.b = json!q{ };
a.b.c = 10;
a;
}, globals));
/*
globals.minigui = json!q{};
import arsd.minigui;
globals.minigui.createWindow = {
var v;
auto mw = new MainWindow();
v._object = new OpaqueNativeObject!(MainWindow)(mw);
v.loop = { mw.loop(); };
return v;
};
*/
repl(globals);
writeln("BACK IN D!");
globals.c()(10); // call script defined functions in D (note: this runs the interpreter)
//writeln(globals._getMember("lol", false));
return;
var k,l ;
var j = json!q{
"hello": {
"data":[1,2,"giggle",4]
},
"world":20
};
writeln(j.hello.data[2]);
Test t;
var rofl = t;
writeln(rofl.name);
writeln(rofl.a);
rofl.a = "20";
rofl.name = "twenty";
t = rofl.get!Test;
writeln(t);
var a1 = 10;
a1 -= "5";
a1 /= 2;
writeln(a1);
var a = 10;
var b = 20;
a = b;
b = 30;
a += 100.2;
writeln(a);
var c = var.emptyObject;
c.a = b;
var d = c;
d.b = 50;
writeln(c.b);
writeln(d.toJson());
var e = a + b;
writeln(a, " + ", b, " = ", e);
e = function(var lol) {
writeln("hello with ",lol,"!");
return lol + 10;
};
writeln(e("15"));
if(var("ass") > 100)
writeln(var("10") / "3");
}
template json(string s) {
// ctfe doesn't support the unions std.json uses :(
//enum json = var.fromJsonObject(s);
// FIXME we should at least validate string s at compile time
var json() {
return var.fromJson("{" ~ s ~ "}");
}
}
// literals
// var a = varArray(10, "cool", 2);
// assert(a[0] == 10); assert(a[1] == "cool"); assert(a[2] == 2);
var varArray(T...)(T t) {
var a = var.emptyArray;
foreach(arg; t)
a ~= var(arg);
return a;
}
// var a = varObject("cool", 10, "bar", "baz");
// assert(a.cool == 10 && a.bar == "baz");
var varObject(T...)(T t) {
var a = var.emptyObject;
string lastString;
foreach(idx, arg; t) {
static if(idx % 2 == 0) {
lastString = arg;
} else {
assert(lastString !is null);
a[lastString] = arg;
lastString = null;
}
}
return a;
}
private real stringToNumber(string s) {
real r;
try {
r = to!real(s);
} catch (Exception e) {
r = real.nan;
}
return r;
}
private bool realIsInteger(real r) {
return (r == cast(long) r);
}
// helper template for operator overloading
private var _op(alias _this, alias this2, string op, T)(T t) if(op == "~") {
static if(is(T == var)) {
if(t.payloadType() == var.Type.Array)
return _op!(_this, this2, op)(t._payload._array);
else if(t.payloadType() == var.Type.String)
return _op!(_this, this2, op)(t._payload._string);
//else
//return _op!(_this, this2, op)(t.get!string);
}
if(this2.payloadType() == var.Type.Array) {
auto l = this2._payload._array;
static if(isArray!T && !isSomeString!T)
foreach(item; t)
l ~= var(item);
else
l ~= var(t);
_this._type = var.Type.Array;
_this._payload._array = l;
return _this;
} else if(this2.payloadType() == var.Type.String) {
auto l = this2._payload._string;
l ~= var(t).get!string; // is this right?
_this._type = var.Type.String;
_this._payload._string = l;
return _this;
} else {
auto l = this2.get!string;
l ~= var(t).get!string;
_this._type = var.Type.String;
_this._payload._string = l;
return _this;
}
assert(0);
}
// FIXME: maybe the bitops should be moved out to another function like ~ is
private var _op(alias _this, alias this2, string op, T)(T t) if(op != "~") {
static if(is(T == var)) {
if(t.payloadType() == var.Type.Integral)
return _op!(_this, this2, op)(t._payload._integral);
if(t.payloadType() == var.Type.Floating)
return _op!(_this, this2, op)(t._payload._floating);
if(t.payloadType() == var.Type.String)
return _op!(_this, this2, op)(t._payload._string);
assert(0, to!string(t.payloadType()));
} else {
if(this2.payloadType() == var.Type.Integral) {
auto l = this2._payload._integral;
static if(isIntegral!T) {
mixin("l "~op~"= t;");
_this._type = var.Type.Integral;
_this._payload._integral = l;
return _this;
} else static if(isFloatingPoint!T) {
static if(op == "&" || op == "|" || op == "^") {
this2._type = var.Type.Integral;
long f = l;
mixin("f "~op~"= cast(long) t;");
_this._type = var.Type.Integral;
_this._payload._integral = f;
} else {
this2._type = var.Type.Floating;
real f = l;
mixin("f "~op~"= t;");
_this._type = var.Type.Floating;
_this._payload._floating = f;
}
return _this;
} else static if(isSomeString!T) {
auto rhs = stringToNumber(t);
if(realIsInteger(rhs)) {
mixin("l "~op~"= cast(long) rhs;");
_this._type = var.Type.Integral;
_this._payload._integral = l;
} else{
static if(op == "&" || op == "|" || op == "^") {
long f = l;
mixin("f "~op~"= cast(long) rhs;");
_this._type = var.Type.Integral;
_this._payload._integral = f;
} else {
real f = l;
mixin("f "~op~"= rhs;");
_this._type = var.Type.Floating;
_this._payload._floating = f;
}
}
return _this;
}
} else if(this2.payloadType() == var.Type.Floating) {
auto f = this._payload._floating;
static if(isIntegral!T || isFloatingPoint!T) {
static if(op == "&" || op == "|" || op == "^") {
long argh = cast(long) f;
mixin("argh "~op~"= cast(long) t;");
_this._type = var.Type.Integral;
_this._payload._integral = argh;
} else {
mixin("f "~op~"= t;");
_this._type = var.Type.Floating;
_this._payload._floating = f;
}
return _this;
} else static if(isSomeString!T) {
auto rhs = stringToNumber(t);
static if(op == "&" || op == "|" || op == "^") {
long pain = cast(long) f;
mixin("pain "~op~"= cast(long) rhs;");
_this._type = var.Type.Integral;
_this._payload._floating = pain;
} else {
mixin("f "~op~"= rhs;");
_this._type = var.Type.Floating;
_this._payload._floating = f;
}
return _this;
} else assert(0);
} else if(this2.payloadType() == var.Type.String) {
static if(op == "&" || op == "|" || op == "^") {
long r = cast(long) stringToNumber(this2._payload._string);
long rhs;
} else {
real r = stringToNumber(this2._payload._string);
real rhs;
}
static if(isSomeString!T) {
rhs = cast(typeof(rhs)) stringToNumber(t);
} else {
rhs = to!(typeof(rhs))(t);
}
mixin("r " ~ op ~ "= rhs;");
static if(is(typeof(r) == real)) {
_this._type = var.Type.Floating;
_this._payload._floating = r;
} else static if(is(typeof(r) == long)) {
_this._type = var.Type.Integral;
_this._payload._integral = r;
} else static assert(0);
return _this;
} else {
// the operation is nonsensical, we should throw or ignore it
var i = 0;
return i;
}
}
assert(0);
}
struct var {
public this(T)(T t) {
static if(is(T == var))
this = t;
else
this.opAssign(t);
}
public var _copy() {
final switch(payloadType()) {
case Type.Integral:
case Type.Boolean:
case Type.Floating:
case Type.Function:
case Type.String:
// since strings are immutable, we can pretend they are value types too
return this; // value types don't need anything special to be copied
case Type.Array:
var cp;
cp = this._payload._array[];
return cp;
case Type.Object:
var cp;
if(this._payload._object !is null)
cp._object = this._payload._object.copy;
return cp;
}
}
public bool opCast(T:bool)() {
final switch(this._type) {
case Type.Object:
return this._payload._object !is null;
case Type.Array:
return this._payload._array.length != 0;
case Type.String:
return this._payload._string.length != 0;
case Type.Integral:
return this._payload._integral != 0;
case Type.Floating:
return this._payload._floating != 0;
case Type.Boolean:
return this._payload._boolean;
case Type.Function:
return this._payload._function !is null;
}
}
public int opApply(scope int delegate(ref var) dg) {
foreach(i, item; this)
if(auto result = dg(item))
return result;
return 0;
}
public int opApply(scope int delegate(var, ref var) dg) {
if(this.payloadType() == Type.Array) {
foreach(i, ref v; this._payload._array)
if(auto result = dg(var(i), v))
return result;
} else if(this.payloadType() == Type.Object && this._payload._object !is null) {
// FIXME: if it offers input range primitives, we should use them
// FIXME: user defined opApply on the object
foreach(k, ref v; this._payload._object)
if(auto result = dg(var(k), v))
return result;
} else if(this.payloadType() == Type.String) {
// this is to prevent us from allocating a new string on each character, hopefully limiting that massively
static immutable string chars = makeAscii!();
foreach(i, dchar c; this._payload._string) {
var lol = "";
if(c < 128)
lol._payload._string = chars[c .. c + 1];
else
lol._payload._string = to!string(""d ~ c); // blargh, how slow can we go?
if(auto result = dg(var(i), lol))
return result;
}
}
// throw invalid foreach aggregate
return 0;
}
public T opCast(T)() {
return this.get!T;
}
public auto ref putInto(T)(ref T t) {
return t = this.get!T;
}
// if it is var, we'll just blit it over
public var opAssign(T)(T t) if(!is(T == var)) {
static if(isFloatingPoint!T) {
this._type = Type.Floating;
this._payload._floating = t;
} else static if(isIntegral!T) {
this._type = Type.Integral;
this._payload._integral = t;
} else static if(isCallable!T) {
this._type = Type.Function;
static if(is(T == typeof(this._payload._function))) {
this._payload._function = t;
} else
this._payload._function = delegate var(var _this, var[] args) {
var ret;
ParameterTypeTuple!T fargs;
foreach(idx, a; fargs) {
if(idx == args.length)
break;
cast(Unqual!(typeof(a))) fargs[idx] = args[idx].get!(typeof(a));
}
static if(is(ReturnType!t == void)) {
t(fargs);
} else {
ret = t(fargs);
}
return ret;
};
} else static if(isSomeString!T) {
this._type = Type.String;
this._payload._string = to!string(t);
} else static if(is(T : PrototypeObject)) {
// support direct assignment of pre-made implementation objects
// so prewrapped stuff can be easily passed.
this._type = Type.Object;
this._payload._object = t;
} else static if(is(T == class)) {
// auto-wrap other classes with reference semantics
this._type = Type.Object;
this._payload._object = wrapNativeObject(t);
} else static if(is(T == struct) || isAssociativeArray!T) {
// copy structs and assoc arrays by value into a var object
this._type = Type.Object;
auto obj = new PrototypeObject();
this._payload._object = obj;
static if(is(T == struct))
foreach(member; __traits(allMembers, T)) {
static if(__traits(compiles, __traits(getMember, t, member))) {
static if(is(typeof(__traits(getMember, t, member)) == function)) {
// skipping these because the delegate we get isn't going to work anyway; the object may be dead and certainly won't be updated
//this[member] = &__traits(getMember, proxyObject, member);
} else
this[member] = __traits(getMember, t, member);
}
} else {
// assoc array
foreach(l, v; t) {
this[var(l)] = var(v);
}
}
} else static if(isArray!T) {
this._type = Type.Array;
var[] arr;
arr.length = t.length;
static if(!is(T == void[])) // we can't append a void array but it is nice to support x = [];
foreach(i, item; t)
arr[i] = var(item);
this._payload._array = arr;
} else static if(is(T == bool)) {
this._type = Type.Boolean;
this._payload._boolean = t;
} else static if(isSomeChar!T) {
this._type = Type.String;
this._payload._string = "";
import std.utf;
char[4] ugh;
auto size = encode(ugh, t);
this._payload._string = ugh[0..size].idup;
}// else static assert(0, "unsupported type");
return this;
}
public size_t opDollar() {
return this.length().get!size_t;
}
public var opOpAssign(string op, T)(T t) {
if(payloadType() == Type.Object) {
var* operator = this._payload._object._peekMember("opOpAssign", true);
if(operator !is null && operator._type == Type.Function)
return operator.call(this, op, t);
}
return _op!(this, this, op, T)(t);
}
public var opBinary(string op, T)(T t) {
var n;
if(payloadType() == Type.Object) {
var* operator = this._payload._object._peekMember("opBinary", true);
if(operator !is null && operator._type == Type.Function) {
return operator.call(this, op, t);
}
}
return _op!(n, this, op, T)(t);
}
public var opBinaryRight(string op, T)(T s) {
return var(s).opBinary!op(this);
}
// this in foo
public var* opBinary(string op : "in", T)(T s) {
var rhs = var(s);
return rhs.opBinaryRight!"in"(this);
}
// foo in this
public var* opBinaryRight(string op : "in", T)(T s) {
// this needs to be an object
return var(s).get!string in this._object._properties;
}
public var apply(var _this, var[] args) {
if(this.payloadType() == Type.Function) {
assert(this._payload._function !is null);
return this._payload._function(_this, args);
} else if(this.payloadType() == Type.Object) {
assert(this._payload._object !is null, this.toString());
var* operator = this._payload._object._peekMember("opCall", true);
if(operator !is null && operator._type == Type.Function)
return operator.apply(_this, args);
}
version(jsvar_throw)
throw new DynamicTypeException(this, Type.Function);
var ret;
return ret;
}
public var call(T...)(var _this, T t) {
var[] args;
foreach(a; t) {
args ~= var(a);
}
return this.apply(_this, args);
}
public var opCall(T...)(T t) {
return this.call(this, t);
}
public string toString() {
return this.get!string;
}
public T get(T)() if(!is(T == void)) {
static if(is(T == var)) {
return this;
} else static if(__traits(compiles, T(this))) {
return T(this);
} else static if(__traits(compiles, new T(this))) {
return new T(this);
} else
final switch(payloadType) {
case Type.Boolean:
static if(is(T == bool))
return this._payload._boolean;
else static if(isFloatingPoint!T || isIntegral!T)
return cast(T) (this._payload._boolean ? 1 : 0); // the cast is for enums, I don't like this so FIXME
else static if(isSomeString!T)
return this._payload._boolean ? "true" : "false";
else
return T.init;
case Type.Object:
static if(isAssociativeArray!T) {
T ret;
if(this._payload._object !is null)
foreach(k, v; this._payload._object._properties)
ret[to!(KeyType!T)(k)] = v.get!(ValueType!T);
return ret;
} else static if(is(T : PrototypeObject)) {
// they are requesting an implementation object, just give it to them
return cast(T) this._payload._object;
} else static if(is(T == struct) || is(T == class)) {
// first, we'll try to give them back the native object we have, if we have one
static if(is(T : Object)) {
if(auto wno = cast(WrappedNativeObject) this._payload._object) {
auto no = cast(T) wno.getObject();
if(no !is null)
return no;
}
}
// failing that, generic struct or class getting: try to fill in the fields by name
T t;
bool initialized = true;
static if(is(T == class)) {
static if(__traits(compiles, new T()))
t = new T();
else
initialized = false;
}
if(initialized)
foreach(i, a; t.tupleof) {
cast(Unqual!(typeof((a)))) t.tupleof[i] = this[t.tupleof[i].stringof[2..$]].get!(typeof(a));
}
return t;
} else static if(isSomeString!T) {
if(this._object !is null)
return this._object.toString();
return "null";
} else
return T.init;
case Type.Integral:
static if(isFloatingPoint!T || isIntegral!T)
return to!T(this._payload._integral);
else static if(isSomeString!T)
return to!string(this._payload._integral);
else
return T.init;
case Type.Floating:
static if(isFloatingPoint!T || isIntegral!T)
return to!T(this._payload._floating);
else static if(isSomeString!T)
return to!string(this._payload._floating);
else
return T.init;
case Type.String:
static if(__traits(compiles, to!T(this._payload._string))) {
try {
return to!T(this._payload._string);
} catch (Exception e) { return T.init; }
} else
return T.init;
case Type.Array:
import std.range;
auto pl = this._payload._array;
static if(isSomeString!T) {
return to!string(pl);
} else static if(isArray!T) {
T ret;
static if(is(ElementType!T == void)) {
static assert(0, "try wrapping the function to get rid of void[] args");
//alias getType = ubyte;
} else
alias getType = ElementType!T;
foreach(item; pl)
ret ~= item.get!(getType);
return ret;
} else
return T.init;
// is it sane to translate anything else?
case Type.Function:
static if(isSomeString!T)
return "<function>";
else static if(isDelegate!T) {
// making a local copy because otherwise the delegate might refer to a struct on the stack and get corrupted later or something
auto func = this._payload._function;
// the static helper lets me pass specific variables to the closure
static T helper(typeof(func) func) {
return delegate ReturnType!T (ParameterTypeTuple!T args) {
var[] arr;
foreach(arg; args)
arr ~= var(arg);
var ret = func(var(null), arr);
static if(is(ReturnType!T == void))
return;
else
return ret.get!(ReturnType!T);
};
}
return helper(func);
} else
return T.init;
// FIXME: we just might be able to do better for both of these
//break;
}
}
public T nullCoalesce(T)(T t) {
if(_type == Type.Object && _payload._object is null)
return t;
return this.get!T;
}
public int opCmp(T)(T t) {
auto f = this.get!real;
static if(is(T == var))
auto r = t.get!real;
else
auto r = t;
return cast(int)(f - r);
}
public bool opEquals(T)(T t) {
return this.opEquals(var(t));
}
public bool opEquals(T:var)(T t) const {
// FIXME: should this be == or === ?
if(this._type != t._type)
return false;
final switch(this._type) {
case Type.Object:
return _payload._object is t._payload._object;
case Type.Integral:
return _payload._integral == t._payload._integral;
case Type.Boolean:
return _payload._boolean == t._payload._boolean;
case Type.Floating:
return _payload._floating == t._payload._floating; // FIXME: approxEquals?
case Type.String:
return _payload._string == t._payload._string;
case Type.Function:
return _payload._function is t._payload._function;
case Type.Array:
return _payload._array == t._payload._array;
}
assert(0);
}
public enum Type {
Object, Array, Integral, Floating, String, Function, Boolean
}
public Type payloadType() {
return _type;
}
private Type _type;
private union Payload {
PrototypeObject _object;
var[] _array;
long _integral;
real _floating;
string _string;
bool _boolean;
var delegate(var _this, var[] args) _function;
}
public void _function(var delegate(var, var[]) f) {
this._payload._function = f;
this._type = Type.Function;
}
/*
public void _function(var function(var, var[]) f) {
var delegate(var, var[]) dg;
dg.ptr = null;
dg.funcptr = f;
this._function = dg;
}
*/
public void _object(PrototypeObject obj) {
this._type = Type.Object;
this._payload._object = obj;
}
public PrototypeObject _object() {
if(this._type == Type.Object)
return this._payload._object;
return null;
}
package Payload _payload;
private void _requireType(Type t, string file = __FILE__, size_t line = __LINE__){
if(this.payloadType() != t)
throw new DynamicTypeException(this, t, file, line);
}
public var opSlice(var e1, var e2) {
return this.opSlice(e1.get!ptrdiff_t, e2.get!ptrdiff_t);
}
public var opSlice(ptrdiff_t e1, ptrdiff_t e2) {
if(this.payloadType() == Type.Array) {
if(e1 > _payload._array.length)
e1 = _payload._array.length;
if(e2 > _payload._array.length)
e2 = _payload._array.length;
return var(_payload._array[e1 .. e2]);
}
if(this.payloadType() == Type.String) {
if(e1 > _payload._string.length)
e1 = _payload._string.length;
if(e2 > _payload._string.length)
e2 = _payload._string.length;
return var(_payload._string[e1 .. e2]);
}