runtime.js

module.exports.load = function(nqp, CodeRef, Capture, containerSpecs) {
  const Null = nqp.Null;
  let op = {};

  let Scalar, True, False, Int, Num, Str, Code, Mu, Any, ContainerDescriptor, Routine;

  let Iterable;

  let defaultContainerDescriptor;

  op.p6settypes = function(types) {
    Scalar = types.content.get('Scalar');
    True = types.content.get('True');
    False = types.content.get('False');
    Int = types.content.get('Int');
    Num = types.content.get('Num');
    Str = types.content.get('Str');
    Code = types.content.get('Code');
    Mu = types.content.get('Mu');
    Any = types.content.get('Any');
    Nil = types.content.get('Nil');
    Routine = types.content.get('Routine');
    ContainerDescriptor = types.content.get('ContainerDescriptor');
    Signature = types.content.get('Signature');

    defaultContainerDescriptor = ContainerDescriptor._STable.REPR.allocate(ContainerDescriptor._STable);

    defaultContainerDescriptor.$$bindattr(ContainerDescriptor, '$!of', Mu);

    defaultContainerDescriptor.$$bindattr_s(ContainerDescriptor, '$!name', "<element>");
    defaultContainerDescriptor.$$bindattr_i(ContainerDescriptor, '$!rw', 1);
    defaultContainerDescriptor.$$bindattr(ContainerDescriptor, '$!default', Any);

    return types;
  };

  op.p6bool = function(value) {
    return value ? True : False;
  };

  op.p6definite = function(obj) {
    return (obj === Null || obj.typeObject_) ? False : True;
  };

  op.p6typecheckrv = function(ctx, rv, routine, bypassType) {
    const sig = routine.$$getattr(Code, '$!signature');
    const rtype = sig.$$getattr(Signature, '$!returns');
    if (rtype !== Null && nqp.op.objprimspec(rtype) === 0) {
      const decontValue = rv.$$decont(ctx);
      if (decontValue.$$istype(ctx, rtype) === 0 && decontValue.$$istype(ctx, bypassType) === 0) {
        const thrower = getThrower("X::TypeCheck::Return");
        if (thrower === Null) {
            ctx.die("Type check failed for return value");
        } else {
            thrower.$$call(ctx, null, decontValue, rtype);
        }
      }
    }

    return rv;
  };

  op.p6setfirstflag = function(codeObj) {
    firstPhaserCodeBlock = codeObj.$$getattr(Code, "$!do");
    return codeObj;
  };

  op.p6takefirstflag = function(ctx) {
    const matches = firstPhaserCodeBlock === ctx.codeRef();
    firstPhaserCodeBlock = Null;
    return matches ? 1 : 0;
  };

  const prePhaserFrames = [];

  op.p6setpre = function(ctx) {
    prePhaserFrames.push(ctx);
    return Null;
  };

  op.p6clearpre = function(ctx) {
    const index = prePhaserFrames.indexOf(ctx);
    if (index !== -1) {
      prePhaserFrames.splice(index, 1);
    }
    return Null;
  };

  op.p6inpre = function(ctx) {
    const index = prePhaserFrames.indexOf(ctx.$$caller);
    if (index !== -1) {
      prePhaserFrames.splice(index, 1);
      return 1;
    } else {
      return 0;
    }
  };

  function isRWScalar(check) {
    if (check._STable === Scalar._STable && !check.typeObject_) {
      let desc = check.$$getattr(Scalar, '$!descriptor');
      if (desc === Null) {
        return false;
      }
      return desc.$$getattr_i(ContainerDescriptor, '$!rw') !== 0;
    }
    return false;
  }

  op.p6decontrv = function(ctx, routine, retval) {
    if (isRWScalar(retval)) {
      let isRW = routine.$$getattr_i(Routine, '$!rw');
      if (isRW === 0) {
        const deconted = retval.$$decont(ctx);

        if (Iterable !== undefined && deconted.$$istype(ctx, Iterable) == 0) {
          return deconted;
        } else {
          let roCont = Scalar._STable.REPR.allocate(Scalar._STable);
          roCont.$$bindattr(Scalar, '$!value', deconted);
          return roCont;
        }
      }
    } else if (retval._STable && retval._STable.REPR instanceof nqp.NativeRef) {
      let isRW = routine.$$getattr_i(Routine, '$!rw');
      if (isRW === 0) {
        return retval.$$decont(ctx);
      }
    }
    return retval;
  };

  op.p6box_i = function(int) {
    var repr = Int._STable.REPR;
    var boxed = repr.allocate(Int._STable);
    boxed.$$setInt(int);
    return boxed;
  };

  op.p6box_n = function(num) {
    var repr = Num._STable.REPR;
    var boxed = repr.allocate(Num._STable);
    boxed.$$setNum(num);
    return boxed;
  };

  op.p6box_s = function(str) {
    var repr = Str._STable.REPR;
    var boxed = repr.allocate(Str._STable);
    boxed.$$setStr(str);
    return boxed;
  };

  op.p6captureouters2 = function(ctx, capList, target) {
    var cf = target.outerCtx;

    if (cf === Null) {
      return capList;
    }

    var elems = capList.$$elems();

    for (var i = 0; i < elems; i++) {
        var codeObj = capList.$$atpos(i);

        var closure = codeObj.$$getattr(Code, "$!do");

        var ctxToDiddle = closure.outerCtx;
        if (ctxToDiddle) {
          ctxToDiddle.$$outer = cf;
        } else {
          console.log("can't diddle", closure);
        }
    }

    return capList;
  };

  op.p6capturelex = function(ctx, codeObj) {
    var closure = codeObj.$$getattr(Code, "$!do");
    var wantedStaticInfo = closure.staticCode.outerCodeRef;

    if (ctx.codeRef().staticCode === wantedStaticInfo) {
      closure.outerCtx = ctx;
      closure.capture(closure.staticCode.freshBlock());
    } else {
      /* HACK - workaround for rakudo bugs */
      //console.log("HORRIBLE hack - p6capturelex will do nothing");
    }

    return codeObj;
  };

  op.p6capturelexwhere = function(ctx, codeObj) {
    var closure = codeObj.$$getattr(Code, "$!do");
    var wantedStaticInfo = closure.staticCode.outerCodeRef;

    var find = ctx;

    while (find) {
        if (find.codeRef().staticCode === wantedStaticInfo) {
          closure.outerCtx = find;
          closure.capture(closure.staticCode.freshBlock());
          return codeObj;
        }
        find = find.$$caller;
    }
  //  console.log("HORRIBLE hack - p6capturelexwhere will do nothing");

    return codeObj;
  };

  op.p6var = function(cont) {
    if (cont.$$iscont && cont.$$iscont()) {
      var wrapper = Scalar._STable.REPR.allocate(Scalar._STable);
      wrapper.$$bindattr(Scalar, '$!value', cont);
      return wrapper;
    } else {
      return cont;
    }
  }

  op.p6bindassert = function(ctx, value, type) {
    if (type !== Mu) {
      if (value.$$decont(ctx).$$istype(ctx, type) == 0) {
        const thrower = getThrower("X::TypeCheck::Binding");

        if (thrower === null) {
          ctx.die("Type check failed in binding");
        } else {
          thrower.$$call(ctx, null, value, type);
        }
      }
    }
    return value;
  };

  op.p6setitertype = function(type) {
    Iterable = type;
    return type;
  };

  op.p6store = function(ctx, cont, value) {
    if (cont.$$assign) {
      cont.$$assign(ctx, value.$$decont(ctx));
    } else {
      if (!cont.STORE) {
        // TODO throw typed exception X::Assignment::RO
        ctx.die("Cannot assign to a non-container");
      } else {
        cont.STORE(ctx, null, cont, value);
      }
    }
    return cont;
  };

  const p6HLL = nqp.getHLL('perl6');

  op.p6argvmarray = function(ctx, args) {
    var array = [];
    for (var i=2; i < args.length; i++) {
      array[i-2] = nqp.op.hllizefor(ctx, nqp.arg(p6HLL, args[i]), 'perl6');
    }
    return nqp.createArray(array);
  };

  op.p6recont_ro = function(cont) {
    if (isRWScalar(cont)) {
      let roCont = Scalar._STable.REPR.allocate(Scalar._STable);
      roCont.$$bindattr(Scalar, '$!value', cont.$$decont(null));
      return roCont;
    }
    return cont;
  };

  op.p6scalarfromdesc = function(desc) {
    if (desc === Null || desc.typeObject_)
        desc = defaultContainerDescriptor;

    let defVal = desc.$$getattr(ContainerDescriptor, '$!default');

    let cont = Scalar._STable.REPR.allocate(Scalar._STable);

    cont.$$bindattr(Scalar, '$!descriptor', desc);

    cont.$$bindattr(Scalar, '$!value', defVal);

    return cont;

  };

  op.p6decodelocaltime = function(sinceEpoch) {
    let date = new Date(sinceEpoch * 1000);

    return nqp.createArray([
      date.getSeconds(),
      date.getMinutes(),
      date.getHours(),
      date.getDate(),
      date.getMonth()+1,
      date.getFullYear()
    ]);
  }

  op.p6finddispatcher = function(ctx, usage) {
    let dispatcher;
    let search = ctx.$$caller;
    while (search) {
      /* Do we have a dispatcher here? */
      if (search.hasOwnProperty(["$*DISPATCHER"])) {
        dispatcher = search["$*DISPATCHER"];
        if (dispatcher.typeObject_) {
          dispatcher = dispatcher.vivify_for(ctx, null, dispatcher, search.codeRef().codeObj, search, new Capture(search.$$args[1], Array.prototype.slice.call(search.$$args, 2)));
          search["$*DISPATCHER"] = dispatcher;
        }
        return dispatcher;
      }
      search = search.$$caller;
    }

    /* TODO - throw X::NoDispatcher */
    throw usage + ' is not in the dynamic scope of a dispatcher';
  };

  op.p6argsfordispatcher = function(ctx, dispatcher) {
    let search = ctx;
    while (search) {
      /* Do we have the dispatcher we're looking for? */
      if (search['$*DISPATCHER'] === dispatcher) {
        return new Capture(search.$$args[1], Array.prototype.slice.call(search.$$args, 2));
      }
      /* Follow dynamic chain. */
      search = search.$$caller;
    }
    throw 'Could not find arguments for dispatcher';
  };

  op.p6sink = function(ctx, obj) {
    if (obj.typeObject_ || obj === Null) return;
    if (obj.$$can(ctx, 'sink')) {
      obj.sink(ctx, null, obj);
    }
  };

  op.p6staticouter = function(ctx, codeRef) {
    if (!(codeRef instanceof CodeRef)) throw new nqp.NQPException("p6staticouter must be used on a CodeRef");
    return codeRef.staticCode.outerCodeRef;
  };

  function RakudoScalar(STable) {
    this.STable = STable;
  }

  RakudoScalar.prototype.configure = function(conf) {
    this.setupSTable();
  };

  function getThrower(type) {
    let exHash = nqp.op.gethllsym("perl6", "P6EX");
    return (exHash === Null ? Null : exHash.$$atkey(type));
  }

  RakudoScalar.prototype.setupSTable = function() {
    this.STable.addInternalMethod('$$assignunchecked', function(ctx, value) {
      let whence = this.$$getattr(Scalar, '$!whence');
      if (whence !== Null) whence.$$call(ctx, null);
      this.$$bindattr(Scalar, '$!value', value);
    });

    this.STable.addInternalMethod('$$assign', function(ctx, maybeValue) {
      /* TODO - checking */
      let desc = this.$$getattr(Scalar, '$!descriptor');
      let rw = desc === Null ? 0 : desc.$$getattr_i(ContainerDescriptor, '$!rw');

      if (!rw) {
        if (desc === Null) {
          let name = desc.$$getattr_s(ContainerDescriptor, '$!name');
          ctx.die("Cannot assign to a readonly variable (" + name + ") or a value");
        } else {
          ctx.die("Cannot assign to a readonly variable or a value");
        }
      }

      let value;
      if (maybeValue._STable && maybeValue._STable.WHAT === Nil) {
        value = desc.$$getattr(ContainerDescriptor, '$!default');
      } else {
        value = maybeValue;
        let of = desc.$$getattr(ContainerDescriptor, '$!of');
        if (of !== Mu && value.$$istype(ctx, of)=== 0) {
          let name = desc.$$getattr_s(ContainerDescriptor, '$!name');
          let thrower = getThrower("X::TypeCheck::Assignment");

          if (thrower === null) {
              ctx.die("Type check failed in assignment to '" + name + "'");
          } else {
              thrower.$$call(ctx, null, name, value, of);
          }
        }
      }

      let whence = this.$$getattr(Scalar, '$!whence');
      if (whence !== Null) whence.$$call(ctx, null);

      this.$$bindattr(Scalar, '$!value', value);
    });

    this.STable.addInternalMethod('$$decont', function(ctx) {
      return this.$$getattr(Scalar, '$!value');
    });

    this.STable.addInternalMethod('$$getInt', function(ctx) {
      return this.$$getattr(Scalar, '$!value').$$getInt();
    });

    this.STable.addInternalMethod('$$getStr', function(ctx) {
      return this.$$getattr(Scalar, '$!value').$$getStr();
    });

    this.STable.addInternalMethod('$$getNum', function(ctx) {
      return this.$$getattr(Scalar, '$!value').$$getNum();
    });

    this.STable.addInternalMethod('$$iscont', function() {
      return 1;
    });

    this.STable.addInternalMethod('$$isrwcont', function() {
      if (this.typeObject_) return 0;
      let desc = this.$$getattr(Scalar, '$!descriptor');
      return desc === Null ? 0 : desc.$$getattr_i(ContainerDescriptor, '$!rw');
    });
  };




  RakudoScalar.prototype.serialize = function(cursor) {
    /* No data to serialize. */
  };

  RakudoScalar.prototype.deserialize = function(cursor) {
    /* No data to deserialize. */
  };

  RakudoScalar.prototype.name = 'rakudo_scalar';

  containerSpecs.rakudo_scalar = RakudoScalar;

  nqp.loadOps({op: op});
};