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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
///! Utilities for the implementation of JSAPI proxy handlers.
use dom::bindings::utils::delete_property_by_id;
use dom::bindings::utils::is_dom_proxy;
use js::jsapi::{JSContext, jsid, JSPropertyDescriptor, JSObject, JSString, jschar};
use js::jsapi::{JS_GetPropertyDescriptorById, JS_NewUCString, JS_malloc, JS_free};
use js::jsapi::{JS_DefinePropertyById, JS_NewObjectWithGivenProto};
use js::jsapi::{JS_ReportErrorFlagsAndNumber, JS_StrictPropertyStub};
use js::jsapi::{JSREPORT_WARNING, JSREPORT_STRICT, JSREPORT_STRICT_MODE_ERROR};
use js::jsval::ObjectValue;
use js::glue::GetProxyExtra;
use js::glue::{GetObjectProto, GetObjectParent, SetProxyExtra, GetProxyHandler};
use js::glue::InvokeGetOwnPropertyDescriptor;
use js::glue::RUST_js_GetErrorMessage;
use js::{JSPROP_GETTER, JSPROP_ENUMERATE, JSPROP_READONLY, JSRESOLVE_QUALIFIED};
use libc;
use std::mem;
use std::ptr;
use std::string;
use std::mem::size_of;
static JSPROXYSLOT_EXPANDO: u32 = 0;
pub extern fn getPropertyDescriptor(cx: *mut JSContext, proxy: *mut JSObject,
id: jsid, set: bool,
desc: *mut JSPropertyDescriptor)
-> bool {
unsafe {
let handler = GetProxyHandler(proxy);
if !InvokeGetOwnPropertyDescriptor(handler, cx, proxy, id, set, desc) {
return false;
}
if (*desc).obj.is_not_null() {
return true;
}
//let proto = JS_GetPrototype(proxy);
let proto = GetObjectProto(proxy);
if proto.is_null() {
(*desc).obj = ptr::mut_null();
return true;
}
JS_GetPropertyDescriptorById(cx, proto, id, JSRESOLVE_QUALIFIED, desc) != 0
}
}
pub fn defineProperty_(cx: *mut JSContext, proxy: *mut JSObject, id: jsid,
desc: *mut JSPropertyDescriptor) -> bool {
static JSMSG_GETTER_ONLY: libc::c_uint = 160;
unsafe {
//FIXME: Workaround for https://github.com/mozilla/rust/issues/13385
let setter: *const libc::c_void = mem::transmute((*desc).setter);
let setter_stub: *const libc::c_void = mem::transmute(JS_StrictPropertyStub);
if ((*desc).attrs & JSPROP_GETTER) != 0 && setter == setter_stub {
return JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT |
JSREPORT_STRICT_MODE_ERROR,
Some(RUST_js_GetErrorMessage), ptr::mut_null(),
JSMSG_GETTER_ONLY) != 0;
}
let expando = EnsureExpandoObject(cx, proxy);
if expando.is_null() {
return false;
}
return JS_DefinePropertyById(cx, expando, id, (*desc).value, (*desc).getter,
(*desc).setter, (*desc).attrs) != 0;
}
}
pub extern fn defineProperty(cx: *mut JSContext, proxy: *mut JSObject, id: jsid,
desc: *mut JSPropertyDescriptor) -> bool {
defineProperty_(cx, proxy, id, desc)
}
pub extern fn delete_(cx: *mut JSContext, proxy: *mut JSObject, id: jsid,
bp: *mut bool) -> bool {
unsafe {
let expando = EnsureExpandoObject(cx, proxy);
if expando.is_null() {
return false;
}
return delete_property_by_id(cx, expando, id, &mut *bp);
}
}
pub fn _obj_toString(cx: *mut JSContext, className: *const libc::c_char) -> *mut JSString {
unsafe {
let name = string::raw::from_buf(className as *const i8 as *const u8);
let nchars = "[object ]".len() + name.len();
let chars: *mut jschar = JS_malloc(cx, (nchars + 1) as libc::size_t * (size_of::<jschar>() as libc::size_t)) as *mut jschar;
if chars.is_null() {
return ptr::mut_null();
}
let result = format!("[object {}]", name);
let result = result.as_slice();
for (i, c) in result.chars().enumerate() {
*chars.offset(i as int) = c as jschar;
}
*chars.offset(nchars as int) = 0;
let jsstr = JS_NewUCString(cx, chars, nchars as libc::size_t);
if jsstr.is_null() {
JS_free(cx, chars as *mut libc::c_void);
}
jsstr
}
}
pub fn GetExpandoObject(obj: *mut JSObject) -> *mut JSObject {
unsafe {
assert!(is_dom_proxy(obj));
let val = GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
if val.is_undefined() {
ptr::mut_null()
} else {
val.to_object()
}
}
}
pub fn EnsureExpandoObject(cx: *mut JSContext, obj: *mut JSObject) -> *mut JSObject {
unsafe {
assert!(is_dom_proxy(obj));
let mut expando = GetExpandoObject(obj);
if expando.is_null() {
expando = JS_NewObjectWithGivenProto(cx, ptr::mut_null(),
ptr::mut_null(),
GetObjectParent(obj));
if expando.is_null() {
return ptr::mut_null();
}
SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, ObjectValue(&*expando));
}
return expando;
}
}
pub fn FillPropertyDescriptor(desc: &mut JSPropertyDescriptor, obj: *mut JSObject, readonly: bool) {
desc.obj = obj;
desc.attrs = if readonly { JSPROP_READONLY } else { 0 } | JSPROP_ENUMERATE;
desc.getter = None;
desc.setter = None;
desc.shortid = 0;
}
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