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Rollup merge of rust-lang#89477 - Nicholas-Baron:compute_diff_rs, r=M…
…ark-Simulacrum Move items related to computing diffs to a separate file Work towards rust-lang#89475.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| use std::collections::VecDeque; | ||
| use std::fs::{File, FileType}; | ||
| use std::path::Path; | ||
|
|
||
| #[derive(Debug, PartialEq)] | ||
| pub enum DiffLine { | ||
| Context(String), | ||
| Expected(String), | ||
| Resulting(String), | ||
| } | ||
|
|
||
| #[derive(Debug, PartialEq)] | ||
| pub struct Mismatch { | ||
| pub line_number: u32, | ||
| pub lines: Vec<DiffLine>, | ||
| } | ||
|
|
||
| impl Mismatch { | ||
| fn new(line_number: u32) -> Mismatch { | ||
| Mismatch { line_number, lines: Vec::new() } | ||
| } | ||
| } | ||
|
|
||
| // Produces a diff between the expected output and actual output. | ||
| pub fn make_diff(expected: &str, actual: &str, context_size: usize) -> Vec<Mismatch> { | ||
| let mut line_number = 1; | ||
| let mut context_queue: VecDeque<&str> = VecDeque::with_capacity(context_size); | ||
| let mut lines_since_mismatch = context_size + 1; | ||
| let mut results = Vec::new(); | ||
| let mut mismatch = Mismatch::new(0); | ||
|
|
||
| for result in diff::lines(expected, actual) { | ||
| match result { | ||
| diff::Result::Left(str) => { | ||
| if lines_since_mismatch >= context_size && lines_since_mismatch > 0 { | ||
| results.push(mismatch); | ||
| mismatch = Mismatch::new(line_number - context_queue.len() as u32); | ||
| } | ||
|
|
||
| while let Some(line) = context_queue.pop_front() { | ||
| mismatch.lines.push(DiffLine::Context(line.to_owned())); | ||
| } | ||
|
|
||
| mismatch.lines.push(DiffLine::Expected(str.to_owned())); | ||
| line_number += 1; | ||
| lines_since_mismatch = 0; | ||
| } | ||
| diff::Result::Right(str) => { | ||
| if lines_since_mismatch >= context_size && lines_since_mismatch > 0 { | ||
| results.push(mismatch); | ||
| mismatch = Mismatch::new(line_number - context_queue.len() as u32); | ||
| } | ||
|
|
||
| while let Some(line) = context_queue.pop_front() { | ||
| mismatch.lines.push(DiffLine::Context(line.to_owned())); | ||
| } | ||
|
|
||
| mismatch.lines.push(DiffLine::Resulting(str.to_owned())); | ||
| lines_since_mismatch = 0; | ||
| } | ||
| diff::Result::Both(str, _) => { | ||
| if context_queue.len() >= context_size { | ||
| let _ = context_queue.pop_front(); | ||
| } | ||
|
|
||
| if lines_since_mismatch < context_size { | ||
| mismatch.lines.push(DiffLine::Context(str.to_owned())); | ||
| } else if context_size > 0 { | ||
| context_queue.push_back(str); | ||
| } | ||
|
|
||
| line_number += 1; | ||
| lines_since_mismatch += 1; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| results.push(mismatch); | ||
| results.remove(0); | ||
|
|
||
| results | ||
| } | ||
|
|
||
| pub(crate) fn write_diff(expected: &str, actual: &str, context_size: usize) -> String { | ||
| use std::fmt::Write; | ||
| let mut output = String::new(); | ||
| let diff_results = make_diff(expected, actual, context_size); | ||
| for result in diff_results { | ||
| let mut line_number = result.line_number; | ||
| for line in result.lines { | ||
| match line { | ||
| DiffLine::Expected(e) => { | ||
| writeln!(output, "-\t{}", e).unwrap(); | ||
| line_number += 1; | ||
| } | ||
| DiffLine::Context(c) => { | ||
| writeln!(output, "{}\t{}", line_number, c).unwrap(); | ||
| line_number += 1; | ||
| } | ||
| DiffLine::Resulting(r) => { | ||
| writeln!(output, "+\t{}", r).unwrap(); | ||
| } | ||
| } | ||
| } | ||
| writeln!(output).unwrap(); | ||
| } | ||
| output | ||
| } | ||
|
|
||
| /// Filters based on filetype and extension whether to diff a file. | ||
| /// | ||
| /// Returns whether any data was actually written. | ||
| pub(crate) fn write_filtered_diff<Filter>( | ||
| diff_filename: &str, | ||
| out_dir: &Path, | ||
| compare_dir: &Path, | ||
| verbose: bool, | ||
| filter: Filter, | ||
| ) -> bool | ||
| where | ||
| Filter: Fn(FileType, Option<&str>) -> bool, | ||
| { | ||
| use std::io::{Read, Write}; | ||
| let mut diff_output = File::create(diff_filename).unwrap(); | ||
| let mut wrote_data = false; | ||
| for entry in walkdir::WalkDir::new(out_dir) { | ||
| let entry = entry.expect("failed to read file"); | ||
| let extension = entry.path().extension().and_then(|p| p.to_str()); | ||
| if filter(entry.file_type(), extension) { | ||
| let expected_path = compare_dir.join(entry.path().strip_prefix(&out_dir).unwrap()); | ||
| let expected = if let Ok(s) = std::fs::read(&expected_path) { s } else { continue }; | ||
| let actual_path = entry.path(); | ||
| let actual = std::fs::read(&actual_path).unwrap(); | ||
| let diff = unified_diff::diff( | ||
| &expected, | ||
| &expected_path.to_string_lossy(), | ||
| &actual, | ||
| &actual_path.to_string_lossy(), | ||
| 3, | ||
| ); | ||
| wrote_data |= !diff.is_empty(); | ||
| diff_output.write_all(&diff).unwrap(); | ||
| } | ||
| } | ||
|
|
||
| if !wrote_data { | ||
| println!("note: diff is identical to nightly rustdoc"); | ||
| assert!(diff_output.metadata().unwrap().len() == 0); | ||
| return false; | ||
| } else if verbose { | ||
| eprintln!("printing diff:"); | ||
| let mut buf = Vec::new(); | ||
| diff_output.read_to_end(&mut buf).unwrap(); | ||
| std::io::stderr().lock().write_all(&mut buf).unwrap(); | ||
| } | ||
| true | ||
| } |
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