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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 https://mozilla.org/MPL/2.0/. */
use std::{ptr, slice};
use js::conversions::{
latin1_to_string, ConversionResult, FromJSValConvertible, ToJSValConvertible,
};
use js::error::throw_type_error;
use js::jsapi::{
JSContext, JSString, JS_DeprecatedStringHasLatin1Chars, JS_GetLatin1StringCharsAndLength,
JS_GetTwoByteStringCharsAndLength, JS_NewStringCopyN,
};
use js::jsval::{ObjectValue, StringValue};
use js::rust::{maybe_wrap_value, HandleValue, MutableHandleValue, ToString};
use servo_config::opts;
use crate::reflector::Reflector;
use crate::str::{ByteString, DOMString, USVString};
// http://heycam.github.io/webidl/#es-USVString
impl ToJSValConvertible for USVString {
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
self.0.to_jsval(cx, rval);
}
}
/// Behavior for stringification of `JSVal`s.
#[derive(Clone, PartialEq)]
pub enum StringificationBehavior {
/// Convert `null` to the string `"null"`.
Default,
/// Convert `null` to the empty string.
Empty,
}
// https://heycam.github.io/webidl/#es-DOMString
impl ToJSValConvertible for DOMString {
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
(**self).to_jsval(cx, rval);
}
}
// https://heycam.github.io/webidl/#es-DOMString
impl FromJSValConvertible for DOMString {
type Config = StringificationBehavior;
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
null_behavior: StringificationBehavior,
) -> Result<ConversionResult<DOMString>, ()> {
if null_behavior == StringificationBehavior::Empty && value.get().is_null() {
Ok(ConversionResult::Success(DOMString::new()))
} else {
match ptr::NonNull::new(ToString(cx, value)) {
Some(jsstr) => Ok(ConversionResult::Success(jsstring_to_str(cx, jsstr))),
None => {
debug!("ToString failed");
Err(())
},
}
}
}
}
/// Convert the given `JSString` to a `DOMString`. Fails if the string does not
/// contain valid UTF-16.
///
/// # Safety
/// cx and s must point to valid values.
pub unsafe fn jsstring_to_str(cx: *mut JSContext, s: ptr::NonNull<JSString>) -> DOMString {
let latin1 = JS_DeprecatedStringHasLatin1Chars(s.as_ptr());
DOMString::from_string(if latin1 {
latin1_to_string(cx, s.as_ptr())
} else {
let mut length = 0;
let chars = JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), s.as_ptr(), &mut length);
assert!(!chars.is_null());
let potentially_ill_formed_utf16 = slice::from_raw_parts(chars, length);
let mut s = String::with_capacity(length);
for item in char::decode_utf16(potentially_ill_formed_utf16.iter().cloned()) {
match item {
Ok(c) => s.push(c),
Err(_) => {
// FIXME: Add more info like document URL in the message?
macro_rules! message {
() => {
"Found an unpaired surrogate in a DOM string. \
If you see this in real web content, \
please comment on https://github.com/servo/servo/issues/6564"
};
}
if opts::get().debug.replace_surrogates {
error!(message!());
s.push('\u{FFFD}');
} else {
panic!(concat!(
message!(),
" Use `-Z replace-surrogates` \
on the command line to make this non-fatal."
));
}
},
}
}
s
})
}
// http://heycam.github.io/webidl/#es-USVString
impl FromJSValConvertible for USVString {
type Config = ();
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
_: (),
) -> Result<ConversionResult<USVString>, ()> {
let Some(jsstr) = ptr::NonNull::new(ToString(cx, value)) else {
debug!("ToString failed");
return Err(());
};
let latin1 = JS_DeprecatedStringHasLatin1Chars(jsstr.as_ptr());
if latin1 {
// FIXME(ajeffrey): Convert directly from DOMString to USVString
return Ok(ConversionResult::Success(USVString(String::from(
jsstring_to_str(cx, jsstr),
))));
}
let mut length = 0;
let chars = JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), jsstr.as_ptr(), &mut length);
assert!(!chars.is_null());
let char_vec = slice::from_raw_parts(chars, length);
Ok(ConversionResult::Success(USVString(
String::from_utf16_lossy(char_vec),
)))
}
}
// http://heycam.github.io/webidl/#es-ByteString
impl ToJSValConvertible for ByteString {
unsafe fn to_jsval(&self, cx: *mut JSContext, mut rval: MutableHandleValue) {
let jsstr = JS_NewStringCopyN(
cx,
self.as_ptr() as *const libc::c_char,
self.len() as libc::size_t,
);
if jsstr.is_null() {
panic!("JS_NewStringCopyN failed");
}
rval.set(StringValue(&*jsstr));
}
}
// http://heycam.github.io/webidl/#es-ByteString
impl FromJSValConvertible for ByteString {
type Config = ();
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
_option: (),
) -> Result<ConversionResult<ByteString>, ()> {
let string = ToString(cx, value);
if string.is_null() {
debug!("ToString failed");
return Err(());
}
let latin1 = JS_DeprecatedStringHasLatin1Chars(string);
if latin1 {
let mut length = 0;
let chars = JS_GetLatin1StringCharsAndLength(cx, ptr::null(), string, &mut length);
assert!(!chars.is_null());
let char_slice = slice::from_raw_parts(chars as *mut u8, length);
return Ok(ConversionResult::Success(ByteString::new(
char_slice.to_vec(),
)));
}
let mut length = 0;
let chars = JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), string, &mut length);
let char_vec = slice::from_raw_parts(chars, length);
if char_vec.iter().any(|&c| c > 0xFF) {
throw_type_error(cx, "Invalid ByteString");
Err(())
} else {
Ok(ConversionResult::Success(ByteString::new(
char_vec.iter().map(|&c| c as u8).collect(),
)))
}
}
}
impl ToJSValConvertible for Reflector {
unsafe fn to_jsval(&self, cx: *mut JSContext, mut rval: MutableHandleValue) {
let obj = self.get_jsobject().get();
assert!(!obj.is_null());
rval.set(ObjectValue(obj));
maybe_wrap_value(cx, rval);
}
}
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