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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/. */
//! DOM bindings for `CharacterData`.
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::CharacterDataBinding::CharacterDataMethods;
use dom::bindings::codegen::UnionTypes::NodeOrString;
use dom::bindings::conversions::Castable;
use dom::bindings::error::{Error, ErrorResult, Fallible};
use dom::bindings::js::{LayoutJS, Root};
use dom::document::Document;
use dom::element::Element;
use dom::node::{Node, NodeDamage};
use std::borrow::ToOwned;
use std::cell::Ref;
use util::str::DOMString;
// https://dom.spec.whatwg.org/#characterdata
#[dom_struct]
pub struct CharacterData {
node: Node,
data: DOMRefCell<DOMString>,
}
impl CharacterData {
pub fn new_inherited(data: DOMString, document: &Document) -> CharacterData {
CharacterData {
node: Node::new_inherited(document),
data: DOMRefCell::new(data),
}
}
}
impl CharacterDataMethods for CharacterData {
// https://dom.spec.whatwg.org/#dom-characterdata-data
fn Data(&self) -> DOMString {
self.data.borrow().clone()
}
// https://dom.spec.whatwg.org/#dom-characterdata-data
fn SetData(&self, data: DOMString) {
*self.data.borrow_mut() = data;
self.content_changed();
}
// https://dom.spec.whatwg.org/#dom-characterdata-length
fn Length(&self) -> u32 {
self.data.borrow().chars().map(|c| c.len_utf16()).sum::<usize>() as u32
}
// https://dom.spec.whatwg.org/#dom-characterdata-substringdata
fn SubstringData(&self, offset: u32, count: u32) -> Fallible<DOMString> {
let data = self.data.borrow();
// Step 1.
let data_from_offset = match find_utf16_code_unit_offset(&data, offset) {
Some(offset_bytes) => &data[offset_bytes..],
// Step 2.
None => return Err(Error::IndexSize)
};
let substring = match find_utf16_code_unit_offset(data_from_offset, count) {
// Steps 3.
None => data_from_offset,
// Steps 4.
Some(count_bytes) => &data_from_offset[..count_bytes],
};
Ok(substring.to_owned())
}
// https://dom.spec.whatwg.org/#dom-characterdata-appenddatadata
fn AppendData(&self, data: DOMString) {
self.append_data(&*data);
}
// https://dom.spec.whatwg.org/#dom-characterdata-insertdataoffset-data
fn InsertData(&self, offset: u32, arg: DOMString) -> ErrorResult {
self.ReplaceData(offset, 0, arg)
}
// https://dom.spec.whatwg.org/#dom-characterdata-deletedataoffset-count
fn DeleteData(&self, offset: u32, count: u32) -> ErrorResult {
self.ReplaceData(offset, count, "".to_owned())
}
// https://dom.spec.whatwg.org/#dom-characterdata-replacedata
fn ReplaceData(&self, offset: u32, count: u32, arg: DOMString) -> ErrorResult {
let new_data = {
let data = self.data.borrow();
let (prefix, data_from_offset) = match find_utf16_code_unit_offset(&data, offset) {
Some(offset_bytes) => data.split_at(offset_bytes),
// Step 2.
None => return Err(Error::IndexSize)
};
let suffix = match find_utf16_code_unit_offset(data_from_offset, count) {
// Steps 3.
None => "",
Some(count_bytes) => &data_from_offset[count_bytes..],
};
// Step 4: Mutation observers.
// Step 5 to 7.
let mut new_data = String::with_capacity(prefix.len() + arg.len() + suffix.len());
new_data.push_str(prefix);
new_data.push_str(&arg);
new_data.push_str(suffix);
new_data
};
*self.data.borrow_mut() = new_data;
self.content_changed();
// FIXME: Once we have `Range`, we should implement step 8 to step 11
Ok(())
}
// https://dom.spec.whatwg.org/#dom-childnode-before
fn Before(&self, nodes: Vec<NodeOrString>) -> ErrorResult {
self.upcast::<Node>().before(nodes)
}
// https://dom.spec.whatwg.org/#dom-childnode-after
fn After(&self, nodes: Vec<NodeOrString>) -> ErrorResult {
self.upcast::<Node>().after(nodes)
}
// https://dom.spec.whatwg.org/#dom-childnode-replacewith
fn ReplaceWith(&self, nodes: Vec<NodeOrString>) -> ErrorResult {
self.upcast::<Node>().replace_with(nodes)
}
// https://dom.spec.whatwg.org/#dom-childnode-remove
fn Remove(&self) {
let node = self.upcast::<Node>();
node.remove_self();
}
// https://dom.spec.whatwg.org/#dom-nondocumenttypechildnode-previouselementsibling
fn GetPreviousElementSibling(&self) -> Option<Root<Element>> {
self.upcast::<Node>().preceding_siblings()
.filter_map(Root::downcast::<Element>).next()
}
// https://dom.spec.whatwg.org/#dom-nondocumenttypechildnode-nextelementsibling
fn GetNextElementSibling(&self) -> Option<Root<Element>> {
self.upcast::<Node>().following_siblings()
.filter_map(Root::downcast::<Element>).next()
}
}
impl CharacterData {
#[inline]
pub fn data(&self) -> Ref<DOMString> {
self.data.borrow()
}
#[inline]
pub fn append_data(&self, data: &str) {
self.data.borrow_mut().push_str(data);
self.content_changed();
}
fn content_changed(&self) {
let node = self.upcast::<Node>();
let document = node.owner_doc();
document.r().content_changed(node, NodeDamage::OtherNodeDamage);
}
}
#[allow(unsafe_code)]
pub trait LayoutCharacterDataHelpers {
unsafe fn data_for_layout(&self) -> &str;
}
#[allow(unsafe_code)]
impl LayoutCharacterDataHelpers for LayoutJS<CharacterData> {
#[inline]
unsafe fn data_for_layout(&self) -> &str {
&(*self.unsafe_get()).data.borrow_for_layout()
}
}
/// Given a number of UTF-16 code units from the start of the given string,
/// return the corresponding number of UTF-8 bytes.
///
/// s[find_utf16_code_unit_offset(s, o).unwrap()..] == s.to_utf16()[o..].to_utf8()
fn find_utf16_code_unit_offset(s: &str, offset: u32) -> Option<usize> {
let mut code_units = 0;
for (i, c) in s.char_indices() {
if code_units == offset {
return Some(i)
}
code_units += 1;
if c > '\u{FFFF}' {
if code_units == offset {
panic!("\n\n\
Would split a surrogate pair in CharacterData API.\n\
If you see this in real content, please comment with the URL\n\
on https://github.com/servo/servo/issues/6873\n\
\n");
}
code_units += 1;
}
}
if code_units == offset {
Some(s.len())
} else {
None
}
}
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