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// Copyright 2014 The html5ever Project Developers. See the // COPYRIGHT file at the top-level directory of this distribution. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. //! The interface for consumers of the tree builder (and thus the //! parser overall). use tokenizer::Attribute; use std::borrow::Cow; use string_cache::QualName; use tendril::StrTendril; pub use self::QuirksMode::{Quirks, LimitedQuirks, NoQuirks}; pub use self::NodeOrText::{AppendNode, AppendText}; /// A document's quirks mode. #[derive(PartialEq, Eq, Copy, Clone, Hash, Debug)] pub enum QuirksMode { Quirks, LimitedQuirks, NoQuirks, } /// Something which can be inserted into the DOM. /// /// Adjacent sibling text nodes are merged into a single node, so /// the sink may not want to allocate a `Handle` for each. pub enum NodeOrText<Handle> { AppendNode(Handle), AppendText(StrTendril), } /// Whether to interrupt further parsing of the current input until /// the next explicit resumption of the tokenizer, or continue without /// any interruption. #[derive(PartialEq, Eq, Copy, Clone, Hash, Debug)] pub enum NextParserState { Suspend, Continue, } /// Types which can process tree modifications from the tree builder. pub trait TreeSink { /// `Handle` is a reference to a DOM node. The tree builder requires /// that a `Handle` implements `Clone` to get another reference to /// the same node. type Handle: Clone; /// Signal a parse error. fn parse_error(&mut self, msg: Cow<'static, str>); /// Get a handle to the `Document` node. fn get_document(&mut self) -> Self::Handle; /// Get a handle to a template's template contents. The tree builder /// promises this will never be called with something else than /// a template element. fn get_template_contents(&self, target: Self::Handle) -> Self::Handle; /// Do two handles refer to the same node? fn same_node(&self, x: Self::Handle, y: Self::Handle) -> bool; /// What is the name of this element? /// /// Should never be called on a non-element node; /// feel free to `panic!`. fn elem_name(&self, target: Self::Handle) -> QualName; /// Set the document's quirks mode. fn set_quirks_mode(&mut self, mode: QuirksMode); /// Create an element. /// /// When creating a template element (`name == qualname!(HTML, template)`), /// an associated document fragment called the "template contents" should /// also be created. Later calls to self.get_template_contents() with that /// given element return it. /// https://html.spec.whatwg.org/multipage/#htmltemplateelement fn create_element(&mut self, name: QualName, attrs: Vec<Attribute>) -> Self::Handle; /// Create a comment node. fn create_comment(&mut self, text: StrTendril) -> Self::Handle; /// Append a node as the last child of the given node. If this would /// produce adjacent sibling text nodes, it should concatenate the text /// instead. /// /// The child node will not already have a parent. fn append(&mut self, parent: Self::Handle, child: NodeOrText<Self::Handle>); /// Append a node as the sibling immediately before the given node. If that node /// has no parent, do nothing and return Err(new_node). /// /// The tree builder promises that `sibling` is not a text node. However its /// old previous sibling, which would become the new node's previous sibling, /// could be a text node. If the new node is also a text node, the two should /// be merged, as in the behavior of `append`. /// /// NB: `new_node` may have an old parent, from which it should be removed. fn append_before_sibling(&mut self, sibling: Self::Handle, new_node: NodeOrText<Self::Handle>) -> Result<(), NodeOrText<Self::Handle>>; /// Append a `DOCTYPE` element to the `Document` node. fn append_doctype_to_document(&mut self, name: StrTendril, public_id: StrTendril, system_id: StrTendril); /// Add each attribute to the given element, if no attribute with that name /// already exists. The tree builder promises this will never be called /// with something else than an element. fn add_attrs_if_missing(&mut self, target: Self::Handle, attrs: Vec<Attribute>); /// Detach the given node from its parent. fn remove_from_parent(&mut self, target: Self::Handle); /// Remove all the children from node and append them to new_parent. fn reparent_children(&mut self, node: Self::Handle, new_parent: Self::Handle); /// Mark a HTML `<script>` element as "already started". fn mark_script_already_started(&mut self, node: Self::Handle); /// Indicate that a `<script>` element is complete. fn complete_script(&mut self, _node: Self::Handle) -> NextParserState { NextParserState::Continue } } /// Trace hooks for a garbage-collected DOM. pub trait Tracer { type Handle; /// Upon a call to `trace_handles`, the tree builder will call this method /// for each handle in its internal state. fn trace_handle(&self, node: Self::Handle); }