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ad198993b1
DOM structs embed their parent type as their first field. This
introduces a `.parent()` method to the DOM struct that returns its first
field, and codegens a type assert that ensures that `.parent()` returns
the parent struct.
This generates:
On `#[dom_struct]`:
```rust
impl HasParent for Type {
type Parent = ParentType;
fn as_parent(&self) -> ParentType {
&self.first_field
}
}
```
In the codegen files:
```rust
impl Type {
fn __assert_parent_type(&self) {
let _: &ParentType = self.as_parent();
}
}
````
108 lines
3.4 KiB
Rust
108 lines
3.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::bindings::codegen::Bindings::BlobBinding::BlobMethods;
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use dom::bindings::codegen::Bindings::FileReaderSyncBinding::{FileReaderSyncBinding, FileReaderSyncMethods};
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use dom::bindings::error::{Error, Fallible};
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use dom::bindings::reflector::{Reflector, reflect_dom_object};
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use dom::bindings::root::DomRoot;
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use dom::bindings::str::DOMString;
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use dom::blob::Blob;
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use dom::filereader::FileReaderSharedFunctionality;
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use dom::globalscope::GlobalScope;
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use dom_struct::dom_struct;
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use js::jsapi::{JSContext, JSObject};
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use js::typedarray::{ArrayBuffer, CreateWith};
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use std::ptr;
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use std::ptr::NonNull;
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#[dom_struct]
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pub struct FileReaderSync {
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reflector: Reflector,
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}
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impl FileReaderSync {
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pub fn new_inherited() -> FileReaderSync {
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FileReaderSync {
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reflector: Reflector::new(),
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}
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}
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pub fn new(global: &GlobalScope) -> DomRoot<FileReaderSync> {
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reflect_dom_object(
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Box::new(FileReaderSync::new_inherited()),
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global,
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FileReaderSyncBinding::Wrap,
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)
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}
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pub fn Constructor(global: &GlobalScope) -> Fallible<DomRoot<FileReaderSync>> {
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Ok(FileReaderSync::new(global))
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}
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fn get_blob_bytes(blob: &Blob) -> Result<Vec<u8>, Error> {
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blob.get_bytes().map_err(|_| Error::NotReadable)
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}
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}
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impl FileReaderSyncMethods for FileReaderSync {
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// https://w3c.github.io/FileAPI/#readAsBinaryStringSyncSection
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fn ReadAsBinaryString(&self, blob: &Blob) -> Fallible<DOMString> {
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// step 1
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let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
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// step 2
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Ok(DOMString::from(String::from_utf8_lossy(&blob_contents)))
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}
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// https://w3c.github.io/FileAPI/#readAsTextSync
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fn ReadAsText(&self, blob: &Blob, label: Option<DOMString>) -> Fallible<DOMString> {
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// step 1
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let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
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// step 2
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let blob_label = label.map(String::from);
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let blob_type = String::from(blob.Type());
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let output =
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FileReaderSharedFunctionality::text_decode(&blob_contents, &blob_type, &blob_label);
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Ok(output)
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}
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// https://w3c.github.io/FileAPI/#readAsDataURLSync-section
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fn ReadAsDataURL(&self, blob: &Blob) -> Fallible<DOMString> {
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// step 1
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let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
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// step 2
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let output =
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FileReaderSharedFunctionality::dataurl_format(&blob_contents, blob.Type().to_string());
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Ok(output)
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}
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#[allow(unsafe_code)]
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// https://w3c.github.io/FileAPI/#readAsArrayBufferSyncSection
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unsafe fn ReadAsArrayBuffer(
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&self,
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cx: *mut JSContext,
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blob: &Blob,
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) -> Fallible<NonNull<JSObject>> {
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// step 1
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let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
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// step 2
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rooted!(in(cx) let mut array_buffer = ptr::null_mut::<JSObject>());
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assert!(
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ArrayBuffer::create(
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cx,
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CreateWith::Slice(&blob_contents),
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array_buffer.handle_mut()
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).is_ok()
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);
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Ok(NonNull::new_unchecked(array_buffer.get()))
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}
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}
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