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395 lines (351 loc) · 11.2 KB
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var TypedObjects = (function () {
"use strict";
var TYPED_OBJECT = {}
function Storage(arrayBuffer, isOpaque) {
this.arrayBuffer = arrayBuffer;
this.opaque = isOpaque;
if (isOpaque)
// we pretend reference type size is 1 byte
this.opaqueBuffer = new Array(this.arrayBuffer.byteLength);
}
function setReadOnly(obj, name, value) {
Object.defineProperty(obj, name,
{ value: value, writable: false, configurable: false });
}
function valueType(size, View, name) {
var result = {}
result._size = size;
result._createView = function(s, byteOffset, length) {
return new View(s.arrayBuffer, byteOffset, length);
}
result._createView.BYTES_PER_ELEMENT = View.BYTES_PER_ELEMENT;
result._getItem = function(view, offset) { return view[offset]; };
result._setItem = function(view, offset, v) { view[offset] = v; };
result._name = name;
result._alignment = size;
result._clazz = TYPED_OBJECT;
result._size = size;
result._opaque = false;
setReadOnly(result, 'variable', false);
setReadOnly(result, 'opaque', false);
setReadOnly(result, 'byteLength', size);
setReadOnly(result, 'byteAlignment', size);
return result;
}
function padTo(size, elemSize) {
if (size % elemSize == 0) return size;
return size + (elemSize - (size % elemSize));
}
// Emulate typed array for structs and arrays
function StructView(S) {
var result = function(storage, offset, length) {
if (!offset) {
offset = 0;
length = storage.arrayBuffer.byteLength / S._alignment;
}
this._storage = storage;
this._offset = offset;
}
result.prototype.getItem = function(index) {
return new S(this._storage, this._offset + index * S._alignment);
}
result.prototype.setItem = function(index, v) {
new S(this._storage, this._offset + index * S._alignment, v);
}
return function(s, o, l) { return new result(s, o, l); }
}
var OpaqueView = function(storage, offset, length) {
this._storage = storage;
}
OpaqueView.prototype.getItem = function(index) {
return this._storage.opaqueBuffer[index];
}
OpaqueView.prototype.setItem = function(index, v) {
this._storage.opaqueBuffer[index] = v;
}
var createOpaqueView = function(s, o, l) { return new OpaqueView(s, o, l); }
createOpaqueView.BYTES_PER_ELEMENT = 1;
function referenceType(name) {
var result = {};
result._size = 1;
result._createView = createOpaqueView;
result._getItem = function(view, offset) { return view.getItem(offset); };
result._setItem = function(view, offset, v) { view.setItem(offset, v); };
result._name = name;
result._alignment = 1;
result._clazz = TYPED_OBJECT;
result._size = 1;
result._opaque = true;
return result;
}
var any = referenceType("any");
var object = referenceType("object");
var string = referenceType("string"); // TODO: string conversions
function StructType(typeObj) {
var props = Object.getOwnPropertyNames(typeObj);
var internals = {};
var viewTypes = [];
var viewAccessors = [];
var fieldOffsets = {};
var fieldTypes = {};
var size = 0;
var maxElemAlign = 0;
var opaque = false;
for (var i = 0; i < props.length; i++) {
var pName = props[i];
var pType = typeObj[pName];
if (pType._clazz !== TYPED_OBJECT)
throw new TypeError("Property " + pName + ": unknown type");
if (typeof pType._size == "undefined")
throw new TypeError("Type " + pType._name + " is variable-length");
size = padTo(size, pType._alignment);
var viewTypeIdx = viewTypes.indexOf(pType._createView);
if (viewTypeIdx < 0) {
viewTypeIdx = viewTypes.length;
viewTypes.push(pType._createView);
}
internals[pName] = {
viewTypeIdx : viewTypeIdx,
offset : size / pType._alignment,
byteOffset : size,
type : pType
}
fieldOffsets[pName] = size;
fieldTypes[pName] = pType;
if (pType._alignment > maxElemAlign) {
maxElemAlign = pType._alignment;
}
size += pType._size;
opaque = opaque || pType._opaque;
}
size = padTo(size, maxElemAlign);
var result = function(o, offset, o1) {
var views = new Array(viewTypes.length);
var storage;
if (o instanceof ArrayBuffer) {
if (opaque)
throw new TypeError("Can't create opaque type over ArrayBuffer");
var ab = o;
o = new Storage(ab, false);
}
if (o instanceof Storage) {
storage = o;
if (opaque && !storage.opaque)
throw new TypeError("Can't create opaque type over non-opaque storage");
for (var i = 0; i < viewTypes.length; i++) {
views[i] = viewTypes[i](storage, offset, size / viewTypes[i].BYTES_PER_ELEMENT);
}
} else {
var storage = new Storage(new ArrayBuffer(size), opaque);
for (var i = 0; i < viewTypes.length; i++) {
views[i] = viewTypes[i](storage);
}
}
var opaqueInstance = opaque || storage.opaque;
for (var i = 0; i < props.length; i++) {
var obj = this;
(function() {
var pName = props[i];
var internalDescr = internals[pName];
var view = views[internalDescr.viewTypeIdx];
var offset = internalDescr.offset;
Object.defineProperty(
obj,
pName,
{ configurable: false,
enumerable: true,
get: function() {
return internalDescr.type._getItem(view, offset); },
set: function(v) {
internalDescr.type._setItem(view, offset, v); }
}
);
}) ();
}
if (!(o instanceof Storage) && o) {
for (var i = 0; i < props.length; i++) {
pName = props[i];
this[pName] = o[pName];
}
} else if (o1) {
for (var i = 0; i < props.length; i++) {
pName = props[i];
this[pName] = o1[pName];
}
}
this._opaque = opaqueInstance;
if (!opaqueInstance) {
this._storage = { buffer : storage.arrayBuffer,
byteOffset : offset ? offset : 0,
byteLength : size
}
}
Object.preventExtensions(this);
}
result._size = size;
result._alignment = maxElemAlign;
result._createView = StructView(result);
result._createView.BYTES_PER_ELEMENT = size;
result._getItem = function(view, offset) { return view.getItem(offset); };
result._setItem = function(view, offset, v) { view.setItem(offset, v); };
result._clazz = TYPED_OBJECT;
result._opaque = opaque;
setReadOnly(result, 'variable', false);
setReadOnly(result, 'opaque', opaque);
if (!opaque) {
setReadOnly(result, 'byteLength', size);
setReadOnly(result, 'byteAlignment', maxElemAlign);
setReadOnly(result, 'fieldOffsets', fieldOffsets);
}
setReadOnly(result, 'fieldTypes', fieldTypes);
if (!opaque) {
result.storage = function(o) {
if (o._opaque) throw new TypeError("Can't access storage of opaque instance");
return o._storage;
};
}
return result;
}
function ArrayType(elementType, length) {
if (elementType._clazz !== TYPED_OBJECT) {
throw new TypeError("Not a type");
}
if (typeof elementType._size == "undefined") {
throw new TypeError("Element type cannot be of variable length");
}
var fixedLength = typeof length != "undefined";
var opaque = elementType._opaque;
var result = function(o, byteOffset, o1) {
var self = this;
var view;
var viewLength;
byteOffset = byteOffset ? byteOffset : 0;
var storage;
if (fixedLength) {
viewLength = length;
if (o instanceof ArrayBuffer) {
if (opaque)
throw new TypeError("Can't create a view of opaque type over an array buffer");
o = new Storage(o, opaque);
}
if (o instanceof Storage) {
if (byteOffset % elementType._size != 0)
throw new RangeError("ArrayBuffer size must be a multiple of " + elementType._size);
storage = o;
view = elementType._createView(storage, byteOffset, viewLength);
} else {
var storage = new Storage(new ArrayBuffer(viewLength * elementType._size), opaque);
view = elementType._createView(storage);
}
} else {
viewLength = o;
var storage = new Storage(new ArrayBuffer(viewLength * elementType._size), opaque);
view = elementType._createView(storage, 0, viewLength);
}
for (var i = 0; i < viewLength; i++) {
(function() {
var off = i * elementType._size / elementType._alignment;
Object.defineProperty(
self,
i,
{ configurable:false,
enumerable:true,
get: function() {
return elementType._getItem(view, off);
},
set: function(v) {
elementType._setItem(view, off, v);
}
}
);
})()
}
var opaqueInstance = opaque || storage.opaque;
self._opaque = opaqueInstance;
Object.defineProperty(
self,
"length",
{ configurable:false,
enumerable:false,
writable:false,
value: viewLength
});
if (!opaqueInstance) {
Object.defineProperty(
self,
"byteOffset",
{ configurable:false,
enumerable:false,
writable:false,
value:byteOffset
});
Object.defineProperty(
self,
"byteLength",
{ configurable:false,
enumerable:false,
writeable:false,
value:elementType._size * viewLength
});
if (!opaqueInstance) {
self._storage = {
byteOffset: byteOffset,
byteLength: self.byteLength,
buffer: storage.arrayBuffer
}
}
}
if (fixedLength && !(o instanceof Storage) && o) {
for (i = 0; i < Math.min(viewLength, o.length); i++) {
self[i] = o[i];
}
} else if (o1) {
for (i = 0; i < Math.min(viewLength, o1.length); i++) {
self[i] = o1[i];
}
}
Object.preventExtensions(self);
}
if (fixedLength)
result._size = length * elementType._size;
result._alignment = elementType._alignment;
result._createView = StructView(result);
result._getItem = function(view, offset) { return view.getItem(offset); };
result._setItem = function(view, offset, v) { view.setItem(offset, v); };
result._clazz = TYPED_OBJECT;
result._opaque = opaque;
setReadOnly(result, 'variable', !fixedLength);
setReadOnly(result, 'opaque', opaque);
if (!opaque) {
if (fixedLength)
setReadOnly(result, 'byteLength', result._size);
setReadOnly(result, 'byteAlignment', result._alignment);
}
setReadOnly(result, 'elementType', elementType);
if (!opaque) {
result.storage = function(o) {
if (o._opaque) {
throw new TypeError("Can't access storage of opaque instance");
}
return o._storage;
}
}
return result;
}
return {
int8 : valueType(1, Int8Array, "int8"),
uint8 : valueType(1, Uint8Array, "uint8"),
uint8clamped : valueType(1, Uint8ClampedArray, "uint8"),
int16 : valueType(2, Int16Array, "int16"),
uint16 : valueType(2, Uint16Array, "uint16"),
int32 : valueType(4, Int32Array, "int32"),
uint32 : valueType(4, Uint32Array, "uint32"),
float32 : valueType(4, Float32Array, "float32"),
float64 : valueType(8, Float64Array, "float64"),
any : any,
object : object,
string : string,
StructType: StructType,
ArrayType: ArrayType
};
})();