1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340
|
package otto
// _constructFunction
type _constructFunction func(*_object, []Value) Value
// 13.2.2 [[Construct]]
func defaultConstruct(fn *_object, argumentList []Value) Value {
object := fn.runtime.newObject()
object.class = "Object"
prototype := fn.get("prototype")
if prototype.kind != valueObject {
prototype = toValue_object(fn.runtime.global.ObjectPrototype)
}
object.prototype = prototype._object()
this := toValue_object(object)
value := fn.call(this, argumentList, false, nativeFrame)
if value.kind == valueObject {
return value
}
return this
}
// _nativeFunction
type _nativeFunction func(FunctionCall) Value
// ===================== //
// _nativeFunctionObject //
// ===================== //
type _nativeFunctionObject struct {
name string
file string
line int
call _nativeFunction // [[Call]]
construct _constructFunction // [[Construct]]
}
func (runtime *_runtime) _newNativeFunctionObject(name, file string, line int, native _nativeFunction, length int) *_object {
self := runtime.newClassObject("Function")
self.value = _nativeFunctionObject{
name: name,
file: file,
line: line,
call: native,
construct: defaultConstruct,
}
self.defineProperty("name", toValue_string(name), 0000, false)
self.defineProperty("length", toValue_int(length), 0000, false)
return self
}
func (runtime *_runtime) newNativeFunctionObject(name, file string, line int, native _nativeFunction, length int) *_object {
self := runtime._newNativeFunctionObject(name, file, line, native, length)
self.defineOwnProperty("caller", _property{
value: _propertyGetSet{
runtime._newNativeFunctionObject("get", "internal", 0, func(fc FunctionCall) Value {
for sc := runtime.scope; sc != nil; sc = sc.outer {
if sc.frame.fn == self {
if sc.outer == nil || sc.outer.frame.fn == nil {
return nullValue
}
return runtime.toValue(sc.outer.frame.fn)
}
}
return nullValue
}, 0),
&_nilGetSetObject,
},
mode: 0000,
}, false)
return self
}
// =================== //
// _bindFunctionObject //
// =================== //
type _bindFunctionObject struct {
target *_object
this Value
argumentList []Value
}
func (runtime *_runtime) newBoundFunctionObject(target *_object, this Value, argumentList []Value) *_object {
self := runtime.newClassObject("Function")
self.value = _bindFunctionObject{
target: target,
this: this,
argumentList: argumentList,
}
length := int(toInt32(target.get("length")))
length -= len(argumentList)
if length < 0 {
length = 0
}
self.defineProperty("name", toValue_string("bound "+target.get("name").String()), 0000, false)
self.defineProperty("length", toValue_int(length), 0000, false)
self.defineProperty("caller", Value{}, 0000, false) // TODO Should throw a TypeError
self.defineProperty("arguments", Value{}, 0000, false) // TODO Should throw a TypeError
return self
}
// [[Construct]]
func (fn _bindFunctionObject) construct(argumentList []Value) Value {
object := fn.target
switch value := object.value.(type) {
case _nativeFunctionObject:
return value.construct(object, fn.argumentList)
case _nodeFunctionObject:
argumentList = append(fn.argumentList, argumentList...)
return object.construct(argumentList)
}
panic(fn.target.runtime.panicTypeError())
}
// =================== //
// _nodeFunctionObject //
// =================== //
type _nodeFunctionObject struct {
node *_nodeFunctionLiteral
stash _stash
}
func (runtime *_runtime) newNodeFunctionObject(node *_nodeFunctionLiteral, stash _stash) *_object {
self := runtime.newClassObject("Function")
self.value = _nodeFunctionObject{
node: node,
stash: stash,
}
self.defineProperty("name", toValue_string(node.name), 0000, false)
self.defineProperty("length", toValue_int(len(node.parameterList)), 0000, false)
self.defineOwnProperty("caller", _property{
value: _propertyGetSet{
runtime.newNativeFunction("get", "internal", 0, func(fc FunctionCall) Value {
for sc := runtime.scope; sc != nil; sc = sc.outer {
if sc.frame.fn == self {
if sc.outer == nil || sc.outer.frame.fn == nil {
return nullValue
}
return runtime.toValue(sc.outer.frame.fn)
}
}
return nullValue
}),
&_nilGetSetObject,
},
mode: 0000,
}, false)
return self
}
// ======= //
// _object //
// ======= //
func (self *_object) isCall() bool {
switch fn := self.value.(type) {
case _nativeFunctionObject:
return fn.call != nil
case _bindFunctionObject:
return true
case _nodeFunctionObject:
return true
}
return false
}
func (self *_object) call(this Value, argumentList []Value, eval bool, frame _frame) Value {
switch fn := self.value.(type) {
case _nativeFunctionObject:
// Since eval is a native function, we only have to check for it here
if eval {
eval = self == self.runtime.eval // If eval is true, then it IS a direct eval
}
// Enter a scope, name from the native object...
rt := self.runtime
if rt.scope != nil && !eval {
rt.enterFunctionScope(rt.scope.lexical, this)
rt.scope.frame = _frame{
native: true,
nativeFile: fn.file,
nativeLine: fn.line,
callee: fn.name,
file: nil,
fn: self,
}
defer func() {
rt.leaveScope()
}()
}
return fn.call(FunctionCall{
runtime: self.runtime,
eval: eval,
This: this,
ArgumentList: argumentList,
Otto: self.runtime.otto,
})
case _bindFunctionObject:
// TODO Passthrough site, do not enter a scope
argumentList = append(fn.argumentList, argumentList...)
return fn.target.call(fn.this, argumentList, false, frame)
case _nodeFunctionObject:
rt := self.runtime
stash := rt.enterFunctionScope(fn.stash, this)
rt.scope.frame = _frame{
callee: fn.node.name,
file: fn.node.file,
fn: self,
}
defer func() {
rt.leaveScope()
}()
callValue := rt.cmpl_call_nodeFunction(self, stash, fn.node, this, argumentList)
if value, valid := callValue.value.(_result); valid {
return value.value
}
return callValue
}
panic(self.runtime.panicTypeError("%v is not a function", toValue_object(self)))
}
func (self *_object) construct(argumentList []Value) Value {
switch fn := self.value.(type) {
case _nativeFunctionObject:
if fn.call == nil {
panic(self.runtime.panicTypeError("%v is not a function", toValue_object(self)))
}
if fn.construct == nil {
panic(self.runtime.panicTypeError("%v is not a constructor", toValue_object(self)))
}
return fn.construct(self, argumentList)
case _bindFunctionObject:
return fn.construct(argumentList)
case _nodeFunctionObject:
return defaultConstruct(self, argumentList)
}
panic(self.runtime.panicTypeError("%v is not a function", toValue_object(self)))
}
// 15.3.5.3
func (self *_object) hasInstance(of Value) bool {
if !self.isCall() {
// We should not have a hasInstance method
panic(self.runtime.panicTypeError())
}
if !of.IsObject() {
return false
}
prototype := self.get("prototype")
if !prototype.IsObject() {
panic(self.runtime.panicTypeError())
}
prototypeObject := prototype._object()
value := of._object().prototype
for value != nil {
if value == prototypeObject {
return true
}
value = value.prototype
}
return false
}
// ============ //
// FunctionCall //
// ============ //
// FunctionCall is an encapsulation of a JavaScript function call.
type FunctionCall struct {
runtime *_runtime
_thisObject *_object
eval bool // This call is a direct call to eval
This Value
ArgumentList []Value
Otto *Otto
}
// Argument will return the value of the argument at the given index.
//
// If no such argument exists, undefined is returned.
func (self FunctionCall) Argument(index int) Value {
return valueOfArrayIndex(self.ArgumentList, index)
}
func (self FunctionCall) getArgument(index int) (Value, bool) {
return getValueOfArrayIndex(self.ArgumentList, index)
}
func (self FunctionCall) slice(index int) []Value {
if index < len(self.ArgumentList) {
return self.ArgumentList[index:]
}
return []Value{}
}
func (self *FunctionCall) thisObject() *_object {
if self._thisObject == nil {
this := self.This.resolve() // FIXME Is this right?
self._thisObject = self.runtime.toObject(this)
}
return self._thisObject
}
func (self *FunctionCall) thisClassObject(class string) *_object {
thisObject := self.thisObject()
if thisObject.class != class {
panic(self.runtime.panicTypeError())
}
return self._thisObject
}
func (self FunctionCall) toObject(value Value) *_object {
return self.runtime.toObject(value)
}
// CallerLocation will return file location information (file:line:pos) where this function is being called.
func (self FunctionCall) CallerLocation() string {
// see error.go for location()
return self.runtime.scope.outer.frame.location()
}
|