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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 dom::bindings::codegen::Bindings::TextDecoderBinding;
use dom::bindings::codegen::Bindings::TextDecoderBinding::TextDecoderMethods;
use dom::bindings::error::{Error, Fallible};
use dom::bindings::global::GlobalRef;
use dom::bindings::js::Root;
use dom::bindings::str::USVString;
use dom::bindings::trace::JSTraceable;
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use encoding::Encoding;
use encoding::label::encoding_from_whatwg_label;
use encoding::types::{DecoderTrap, EncodingRef};
use js::jsapi::JS_GetObjectAsArrayBufferView;
use js::jsapi::{JSContext, JSObject};
use std::borrow::ToOwned;
use std::{ptr, slice};
use util::str::DOMString;
#[dom_struct]
pub struct TextDecoder {
reflector_: Reflector,
#[ignore_heap_size_of = "Defined in rust-encoding"]
encoding: EncodingRef,
fatal: bool,
}
impl TextDecoder {
fn new_inherited(encoding: EncodingRef, fatal: bool) -> TextDecoder {
TextDecoder {
reflector_: Reflector::new(),
encoding: encoding,
fatal: fatal,
}
}
fn make_range_error() -> Fallible<Root<TextDecoder>> {
Err(Error::Range("The given encoding is not supported.".to_owned()))
}
pub fn new(global: GlobalRef, encoding: EncodingRef, fatal: bool) -> Root<TextDecoder> {
reflect_dom_object(box TextDecoder::new_inherited(encoding, fatal),
global,
TextDecoderBinding::Wrap)
}
/// https://encoding.spec.whatwg.org/#dom-textdecoder
pub fn Constructor(global: GlobalRef,
label: DOMString,
options: &TextDecoderBinding::TextDecoderOptions)
-> Fallible<Root<TextDecoder>> {
let encoding = match encoding_from_whatwg_label(&label) {
None => return TextDecoder::make_range_error(),
Some(enc) => enc
};
// The rust-encoding crate has WHATWG compatibility, so we are
// guaranteed to have a whatwg_name because we successfully got
// the encoding from encoding_from_whatwg_label.
// Use match + panic! instead of unwrap for better error message
match encoding.whatwg_name() {
None => panic!("Label {} fits valid encoding without valid name", label),
Some("replacement") => return TextDecoder::make_range_error(),
_ => ()
};
Ok(TextDecoder::new(global, encoding, options.fatal))
}
}
impl TextDecoderMethods for TextDecoder {
// https://encoding.spec.whatwg.org/#dom-textdecoder-encoding
fn Encoding(&self) -> DOMString {
self.encoding.whatwg_name().unwrap().to_owned()
}
// https://encoding.spec.whatwg.org/#dom-textdecoder-fatal
fn Fatal(&self) -> bool {
self.fatal
}
#[allow(unsafe_code)]
// https://encoding.spec.whatwg.org/#dom-textdecoder-decode
fn Decode(&self, _cx: *mut JSContext, input: Option<*mut JSObject>)
-> Fallible<USVString> {
let input = match input {
Some(input) => input,
None => return Ok(USVString("".to_owned())),
};
let mut length = 0;
let mut data = ptr::null_mut();
if unsafe { JS_GetObjectAsArrayBufferView(input, &mut length, &mut data).is_null() } {
return Err(Error::Type("Argument to TextDecoder.decode is not an ArrayBufferView".to_owned()));
}
let buffer = unsafe {
slice::from_raw_parts(data as *const _, length as usize)
};
let trap = if self.fatal {
DecoderTrap::Strict
} else {
DecoderTrap::Replace
};
match self.encoding.decode(buffer, trap) {
Ok(s) => Ok(USVString(s)),
Err(_) => Err(Error::Type("Decoding failed".to_owned())),
}
}
}
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