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3398fc017b
For a long time, `gfx_traits` has held a lot of things unrelated to graphics and also unrelated to the `gfx` crate (which is mostly about fonts). This is a cleanup which does a few things: 1. Move non `gfx` crate things out of `gfx_traits`. This is important in order to prevent dependency cycles with a different integration between layout, script, and fonts. 2. Rename the `msg` crate to `base`. It didn't really contain anything to do with messages and instead mostly holds ids, which are used across many different crates in Servo. This new crate will hold the *rare* data types that are widely used. Details: - All BackgroundHangMonitor-related things from base to a new `background_hang_monitor_api` crate. - Moved `TraversalDirection` to `script_traits` - Moved `Epoch`-related things from `gfx_traits` to `base`. - Moved `PrintTree` to base. This should be widely useful in Servo. - Moved `WebrenderApi` from `base` to `webrender_traits` and renamed it to `WebRenderFontApi`.
89 lines
2.5 KiB
Rust
89 lines
2.5 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 https://mozilla.org/MPL/2.0/. */
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/// A struct that makes it easier to print out a pretty tree of data, which
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/// can be visually scanned more easily.
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pub struct PrintTree {
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/// The current level of recursion.
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level: u32,
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/// An item which is queued up, so that we can determine if we need
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/// a mid-tree prefix or a branch ending prefix.
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queued_item: Option<String>,
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}
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impl PrintTree {
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pub fn new(title: String) -> PrintTree {
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println!("\u{250c} {}", title);
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PrintTree {
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level: 1,
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queued_item: None,
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}
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}
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/// Descend one level in the tree with the given title string.
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pub fn new_level(&mut self, queued_title: String) {
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self.flush_queued_item("\u{251C}\u{2500}");
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self.print_level_prefix();
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let items: Vec<&str> = queued_title.split('\n').collect();
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println!("\u{251C}\u{2500} {}", items[0]);
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for i in 1..items.len() {
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self.print_level_child_indentation();
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print!("{}", items[i]);
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if i < items.len() {
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println!();
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}
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}
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self.level += 1;
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}
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/// Ascend one level in the tree.
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pub fn end_level(&mut self) {
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self.flush_queued_item("\u{2514}\u{2500}");
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self.level -= 1;
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}
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/// Add an item to the current level in the tree.
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pub fn add_item(&mut self, text: String) {
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self.flush_queued_item("\u{251C}\u{2500}");
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self.queued_item = Some(text);
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}
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fn print_level_prefix(&self) {
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for _ in 0..self.level {
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print!("\u{2502} ");
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}
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}
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fn print_level_child_indentation(&self) {
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for _ in 0..(self.level + 1) {
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print!("\u{2502} ");
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}
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print!("{}", " ".repeat(7));
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}
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fn flush_queued_item(&mut self, prefix: &str) {
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if let Some(queued_item) = self.queued_item.take() {
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self.print_level_prefix();
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let items: Vec<&str> = queued_item.split('\n').collect();
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println!("{} {}", prefix, items[0]);
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for i in 1..items.len() {
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self.print_level_child_indentation();
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print!("{}", items[i]);
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if i < items.len() {
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println!();
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}
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}
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}
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}
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}
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impl Drop for PrintTree {
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fn drop(&mut self) {
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self.flush_queued_item("\u{2514}\u{2500}");
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}
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}
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