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lib.rs
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lib.rs
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#[macro_use]
extern crate log;
#[macro_use]
extern crate failure;
#[cfg(test)]
#[macro_use]
extern crate proptest;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
use std::collections::HashSet;
use std::ops::Range;
use failure::Error;
pub mod diagnostics;
use diagnostics::{Diagnostic, DiagnosticSpan};
mod replace;
#[derive(Debug, Clone, Copy)]
pub enum Filter {
MachineApplicableOnly,
Everything,
}
pub fn get_suggestions_from_json<S: ::std::hash::BuildHasher>(
input: &str,
only: &HashSet<String, S>,
filter: Filter,
) -> serde_json::error::Result<Vec<Suggestion>> {
let mut result = Vec::new();
for cargo_msg in serde_json::Deserializer::from_str(input).into_iter::<Diagnostic>() {
// One diagnostic line might have multiple suggestions
result.extend(collect_suggestions(&cargo_msg?, only, filter));
}
Ok(result)
}
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub struct LinePosition {
pub line: usize,
pub column: usize,
}
impl std::fmt::Display for LinePosition {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}:{}", self.line, self.column)
}
}
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub struct LineRange {
pub start: LinePosition,
pub end: LinePosition,
}
impl std::fmt::Display for LineRange {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}-{}", self.start, self.end)
}
}
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
/// An error/warning and possible solutions for fixing it
pub struct Suggestion {
pub message: String,
pub snippets: Vec<Snippet>,
pub solutions: Vec<Solution>,
}
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Solution {
pub message: String,
pub replacements: Vec<Replacement>,
}
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Snippet {
pub file_name: String,
pub line_range: LineRange,
pub range: Range<usize>,
/// leading surrounding text, text to replace, trailing surrounding text
///
/// This split is useful for higlighting the part that gets replaced
pub text: (String, String, String),
}
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Replacement {
pub snippet: Snippet,
pub replacement: String,
}
fn parse_snippet(span: &DiagnosticSpan) -> Option<Snippet> {
// unindent the snippet
let indent = span.text
.iter()
.map(|line| {
let indent = line.text
.chars()
.take_while(|&c| char::is_whitespace(c))
.count();
std::cmp::min(indent, line.highlight_start)
})
.min()?;
let start = span.text[0].highlight_start - 1;
let end = span.text[0].highlight_end - 1;
let lead = span.text[0].text[indent..start].to_string();
let mut body = span.text[0].text[start..end].to_string();
for line in span.text.iter().take(span.text.len() - 1).skip(1) {
body.push('\n');
body.push_str(&line.text[indent..]);
}
let mut tail = String::new();
let last = &span.text[span.text.len() - 1];
if span.text.len() > 1 {
body.push('\n');
body.push_str(&last.text[indent..last.highlight_end - 1]);
}
tail.push_str(&last.text[last.highlight_end - 1..]);
Some(Snippet {
file_name: span.file_name.clone(),
line_range: LineRange {
start: LinePosition {
line: span.line_start,
column: span.column_start,
},
end: LinePosition {
line: span.line_end,
column: span.column_end,
},
},
range: (span.byte_start as usize)..(span.byte_end as usize),
text: (lead, body, tail),
})
}
fn collect_span(span: &DiagnosticSpan) -> Option<Replacement> {
let snippet = parse_snippet(span)?;
let replacement = span.suggested_replacement.clone()?;
Some(Replacement { snippet, replacement })
}
pub fn collect_suggestions<S: ::std::hash::BuildHasher>(
diagnostic: &Diagnostic,
only: &HashSet<String, S>,
filter: Filter,
) -> Option<Suggestion> {
if !only.is_empty() {
if let Some(ref code) = diagnostic.code {
if !only.contains(&code.code) {
// This is not the code we are looking for
return None;
}
} else {
// No code, probably a weird builtin warning/error
return None;
}
}
let snippets = diagnostic
.spans
.iter()
.filter_map(|span| parse_snippet(span))
.collect();
let solutions: Vec<_> = diagnostic
.children
.iter()
.filter_map(|child| {
let replacements: Vec<_> = child
.spans
.iter()
.filter(|span| {
use Filter::*;
use diagnostics::Applicability::*;
match (filter, &span.suggestion_applicability) {
(MachineApplicableOnly, Some(MachineApplicable)) => true,
(MachineApplicableOnly, _) => false,
(Everything, _) => true,
}
})
.filter_map(collect_span)
.collect();
if !replacements.is_empty() {
Some(Solution {
message: child.message.clone(),
replacements,
})
} else {
None
}
})
.collect();
if solutions.is_empty() {
None
} else {
Some(Suggestion {
message: diagnostic.message.clone(),
snippets,
solutions,
})
}
}
pub struct CodeFix {
data: replace::Data,
}
impl CodeFix {
pub fn new(s: &str) -> CodeFix {
CodeFix {
data: replace::Data::new(s.as_bytes()),
}
}
pub fn apply(&mut self, suggestion: &Suggestion) -> Result<(), Error> {
for sol in &suggestion.solutions {
for r in &sol.replacements {
self.data.replace_range(
r.snippet.range.start,
r.snippet.range.end.saturating_sub(1),
r.replacement.as_bytes(),
)?;
}
}
Ok(())
}
pub fn finish(&self) -> Result<String, Error> {
Ok(String::from_utf8(self.data.to_vec())?)
}
}
pub fn apply_suggestions(code: &str, suggestions: &[Suggestion]) -> Result<String, Error> {
let mut fix = CodeFix::new(code);
for suggestion in suggestions.iter().rev() {
fix.apply(suggestion)?;
}
fix.finish()
}