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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/. */
use js::jsapi::{JSBool, JSContext};
use js::jsapi::{JS_ValueToUint64, JS_ValueToInt64};
use js::jsapi::{JS_ValueToECMAUint32, JS_ValueToECMAInt32};
use js::jsapi::{JS_ValueToUint16, JS_ValueToNumber, JS_ValueToBoolean};
use js::jsval::JSVal;
use js::jsval::{NullValue, BooleanValue, Int32Value, UInt32Value};
use js::glue::RUST_JS_NumberValue;
pub trait ToJSValConvertible {
fn to_jsval(&self, cx: *JSContext) -> JSVal;
}
pub trait FromJSValConvertible<T> {
fn from_jsval(cx: *JSContext, val: JSVal, option: T) -> Result<Self, ()>;
}
unsafe fn convert_from_jsval<T: Default>(
cx: *JSContext, value: JSVal,
convert_fn: extern "C" unsafe fn(*JSContext, JSVal, *T) -> JSBool) -> Result<T, ()> {
let mut ret = Default::default();
if convert_fn(cx, value, &mut ret as *mut T as *T) == 0 {
Err(())
} else {
Ok(ret)
}
}
impl ToJSValConvertible for bool {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
BooleanValue(*self)
}
}
impl FromJSValConvertible<()> for bool {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<bool, ()> {
let result = unsafe { convert_from_jsval(cx, val, JS_ValueToBoolean) };
result.map(|b| b != 0)
}
}
impl ToJSValConvertible for i8 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
Int32Value(*self as i32)
}
}
impl FromJSValConvertible<()> for i8 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<i8, ()> {
let result = unsafe { convert_from_jsval(cx, val, JS_ValueToECMAInt32) };
result.map(|v| v as i8)
}
}
impl ToJSValConvertible for u8 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
Int32Value(*self as i32)
}
}
impl FromJSValConvertible<()> for u8 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<u8, ()> {
let result = unsafe { convert_from_jsval(cx, val, JS_ValueToECMAInt32) };
result.map(|v| v as u8)
}
}
impl ToJSValConvertible for i16 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
Int32Value(*self as i32)
}
}
impl FromJSValConvertible<()> for i16 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<i16, ()> {
let result = unsafe { convert_from_jsval(cx, val, JS_ValueToECMAInt32) };
result.map(|v| v as i16)
}
}
impl ToJSValConvertible for u16 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
Int32Value(*self as i32)
}
}
impl FromJSValConvertible<()> for u16 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<u16, ()> {
unsafe { convert_from_jsval(cx, val, JS_ValueToUint16) }
}
}
impl ToJSValConvertible for i32 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
Int32Value(*self)
}
}
impl FromJSValConvertible<()> for i32 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<i32, ()> {
unsafe { convert_from_jsval(cx, val, JS_ValueToECMAInt32) }
}
}
impl ToJSValConvertible for u32 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
UInt32Value(*self)
}
}
impl FromJSValConvertible<()> for u32 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<u32, ()> {
unsafe { convert_from_jsval(cx, val, JS_ValueToECMAUint32) }
}
}
impl ToJSValConvertible for i64 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
unsafe {
RUST_JS_NumberValue(*self as f64)
}
}
}
impl FromJSValConvertible<()> for i64 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<i64, ()> {
unsafe { convert_from_jsval(cx, val, JS_ValueToInt64) }
}
}
impl ToJSValConvertible for u64 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
unsafe {
RUST_JS_NumberValue(*self as f64)
}
}
}
impl FromJSValConvertible<()> for u64 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<u64, ()> {
unsafe { convert_from_jsval(cx, val, JS_ValueToUint64) }
}
}
impl ToJSValConvertible for f32 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
unsafe {
RUST_JS_NumberValue(*self as f64)
}
}
}
impl FromJSValConvertible<()> for f32 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<f32, ()> {
let result = unsafe { convert_from_jsval(cx, val, JS_ValueToNumber) };
result.map(|f| f as f32)
}
}
impl ToJSValConvertible for f64 {
fn to_jsval(&self, _cx: *JSContext) -> JSVal {
unsafe {
RUST_JS_NumberValue(*self)
}
}
}
impl FromJSValConvertible<()> for f64 {
fn from_jsval(cx: *JSContext, val: JSVal, _option: ()) -> Result<f64, ()> {
unsafe { convert_from_jsval(cx, val, JS_ValueToNumber) }
}
}
impl<T: ToJSValConvertible> ToJSValConvertible for Option<T> {
fn to_jsval(&self, cx: *JSContext) -> JSVal {
match self {
&Some(ref value) => value.to_jsval(cx),
&None => NullValue(),
}
}
}
impl<X: Default, T: FromJSValConvertible<X>> FromJSValConvertible<()> for Option<T> {
fn from_jsval(cx: *JSContext, value: JSVal, _: ()) -> Result<Option<T>, ()> {
if value.is_null_or_undefined() {
Ok(None)
} else {
let option: X = Default::default();
let result: Result<T, ()> = FromJSValConvertible::from_jsval(cx, value, option);
result.map(Some)
}
}
}
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