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73f07d709c
<!-- Please describe your changes on the following line: --> --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: --> - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors - [ ] These changes fix #__ (github issue number if applicable). <!-- Either: --> - [ ] There are tests for these changes OR - [x] These changes do not require tests because the tree printing code is untested and this is just a correction of a build fix. <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> These were converted from inline UTF-8 to escape sequences, but the sequences should be in hexadecimal instead of decimal. Source-Repo: https://github.com/servo/servo Source-Revision: 717e438b64522b632d62991dc69e9131584db0f6
66 lines
1.8 KiB
Rust
66 lines
1.8 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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/// 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.
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pub fn new_level(&mut self, 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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println!("\u{251C}\u{2500} {}", title);
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self.level = 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 = 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 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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println!("{} {}", prefix, queued_item);
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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{9492}\u{9472}");
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}
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}
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