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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/. */
//! WebIDL constants.
use js::jsapi::{HandleObject, JSContext, JSPROP_ENUMERATE, JSPROP_PERMANENT};
use js::jsapi::{JSPROP_READONLY, JS_DefineProperty};
use js::jsval::{BooleanValue, DoubleValue, Int32Value, JSVal, NullValue, UInt32Value};
use libc;
/// Representation of an IDL constant.
#[derive(Clone)]
pub struct ConstantSpec {
/// name of the constant.
pub name: &'static [u8],
/// value of the constant.
pub value: ConstantVal,
}
/// Representation of an IDL constant value.
#[derive(Clone)]
#[allow(dead_code)]
pub enum ConstantVal {
/// `long` constant.
IntVal(i32),
/// `unsigned long` constant.
UintVal(u32),
/// `double` constant.
DoubleVal(f64),
/// `boolean` constant.
BoolVal(bool),
/// `null` constant.
NullVal,
}
impl ConstantSpec {
/// Returns a `JSVal` that represents the value of this `ConstantSpec`.
pub fn get_value(&self) -> JSVal {
match self.value {
ConstantVal::NullVal => NullValue(),
ConstantVal::IntVal(i) => Int32Value(i),
ConstantVal::UintVal(u) => UInt32Value(u),
ConstantVal::DoubleVal(d) => DoubleValue(d),
ConstantVal::BoolVal(b) => BooleanValue(b),
}
}
}
/// Defines constants on `obj`.
/// Fails on JSAPI failure.
pub unsafe fn define_constants(
cx: *mut JSContext,
obj: HandleObject,
constants: &[ConstantSpec]) {
for spec in constants {
rooted!(in(cx) let value = spec.get_value());
assert!(JS_DefineProperty(cx,
obj,
spec.name.as_ptr() as *const libc::c_char,
value.handle(),
JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT,
None,
None));
}
}
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