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-rw-r--r--examples/print-tree-actions.rs177
1 files changed, 177 insertions, 0 deletions
diff --git a/examples/print-tree-actions.rs b/examples/print-tree-actions.rs
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+// Copyright 2014-2017 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.
+
+#[macro_use]
+extern crate html5ever;
+
+use std::borrow::Cow;
+use std::collections::HashMap;
+use std::default::Default;
+use std::io;
+
+use html5ever::parse_document;
+use html5ever::tendril::*;
+use html5ever::tree_builder::{
+ AppendNode, AppendText, ElementFlags, NodeOrText, QuirksMode, TreeSink,
+};
+use html5ever::{Attribute, ExpandedName, QualName};
+
+struct Sink {
+ next_id: usize,
+ names: HashMap<usize, QualName>,
+}
+
+impl Sink {
+ fn get_id(&mut self) -> usize {
+ let id = self.next_id;
+ self.next_id += 2;
+ id
+ }
+}
+
+impl TreeSink for Sink {
+ type Handle = usize;
+ type Output = Self;
+ fn finish(self) -> Self {
+ self
+ }
+
+ fn parse_error(&mut self, msg: Cow<'static, str>) {
+ println!("Parse error: {}", msg);
+ }
+
+ fn get_document(&mut self) -> usize {
+ 0
+ }
+
+ fn get_template_contents(&mut self, target: &usize) -> usize {
+ if let Some(expanded_name!(html "template")) = self.names.get(target).map(|n| n.expanded())
+ {
+ target + 1
+ } else {
+ panic!("not a template element")
+ }
+ }
+
+ fn set_quirks_mode(&mut self, mode: QuirksMode) {
+ println!("Set quirks mode to {:?}", mode);
+ }
+
+ fn same_node(&self, x: &usize, y: &usize) -> bool {
+ x == y
+ }
+
+ fn elem_name(&self, target: &usize) -> ExpandedName {
+ self.names.get(target).expect("not an element").expanded()
+ }
+
+ fn create_element(&mut self, name: QualName, _: Vec<Attribute>, _: ElementFlags) -> usize {
+ let id = self.get_id();
+ println!("Created {:?} as {}", name, id);
+ self.names.insert(id, name);
+ id
+ }
+
+ fn create_comment(&mut self, text: StrTendril) -> usize {
+ let id = self.get_id();
+ println!("Created comment \"{}\" as {}", escape_default(&text), id);
+ id
+ }
+
+ #[allow(unused_variables)]
+ fn create_pi(&mut self, target: StrTendril, value: StrTendril) -> usize {
+ unimplemented!()
+ }
+
+ fn append(&mut self, parent: &usize, child: NodeOrText<usize>) {
+ match child {
+ AppendNode(n) => println!("Append node {} to {}", n, parent),
+ AppendText(t) => println!("Append text to {}: \"{}\"", parent, escape_default(&t)),
+ }
+ }
+
+ fn append_before_sibling(&mut self, sibling: &usize, new_node: NodeOrText<usize>) {
+ match new_node {
+ AppendNode(n) => println!("Append node {} before {}", n, sibling),
+ AppendText(t) => println!("Append text before {}: \"{}\"", sibling, escape_default(&t)),
+ }
+ }
+
+ fn append_based_on_parent_node(
+ &mut self,
+ element: &Self::Handle,
+ _prev_element: &Self::Handle,
+ child: NodeOrText<Self::Handle>,
+ ) {
+ self.append_before_sibling(element, child);
+ }
+
+ fn append_doctype_to_document(
+ &mut self,
+ name: StrTendril,
+ public_id: StrTendril,
+ system_id: StrTendril,
+ ) {
+ println!("Append doctype: {} {} {}", name, public_id, system_id);
+ }
+
+ fn add_attrs_if_missing(&mut self, target: &usize, attrs: Vec<Attribute>) {
+ assert!(self.names.contains_key(target), "not an element");
+ println!("Add missing attributes to {}:", target);
+ for attr in attrs.into_iter() {
+ println!(" {:?} = {}", attr.name, attr.value);
+ }
+ }
+
+ fn associate_with_form(
+ &mut self,
+ _target: &usize,
+ _form: &usize,
+ _nodes: (&usize, Option<&usize>),
+ ) {
+ // No form owner support.
+ }
+
+ fn remove_from_parent(&mut self, target: &usize) {
+ println!("Remove {} from parent", target);
+ }
+
+ fn reparent_children(&mut self, node: &usize, new_parent: &usize) {
+ println!("Move children from {} to {}", node, new_parent);
+ }
+
+ fn mark_script_already_started(&mut self, node: &usize) {
+ println!("Mark script {} as already started", node);
+ }
+
+ fn set_current_line(&mut self, line_number: u64) {
+ println!("Set current line to {}", line_number);
+ }
+
+ fn pop(&mut self, elem: &usize) {
+ println!("Popped element {}", elem);
+ }
+}
+
+// FIXME: Copy of str::escape_default from std, which is currently unstable
+pub fn escape_default(s: &str) -> String {
+ s.chars().flat_map(|c| c.escape_default()).collect()
+}
+
+fn main() {
+ let sink = Sink {
+ next_id: 1,
+ names: HashMap::new(),
+ };
+ let stdin = io::stdin();
+ parse_document(sink, Default::default())
+ .from_utf8()
+ .read_from(&mut stdin.lock())
+ .unwrap();
+}