1 files changed, 263 insertions, 0 deletions
diff --git a/vendor/rustfix/src/lib.rs b/vendor/rustfix/src/lib.rs
new file mode 100644
index 0000000..f832233
--- /dev/null
+++ b/vendor/rustfix/src/lib.rs
@@ -0,0 +1,263 @@
+#![warn(rust_2018_idioms)]
+
+#[macro_use]
+extern crate log;
+#[cfg(test)]
+#[macro_use]
+extern crate proptest;
+
+use std::collections::HashSet;
+use std::ops::Range;
+
+use anyhow::Error;
+
+pub mod diagnostics;
+use crate::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 - 1)
+        })
+        .min()?;
+
+    let text_slice = span.text[0].text.chars().collect::<Vec<char>>();
+
+    // We subtract `1` because these highlights are 1-based
+    // Check the `min` so that it doesn't attempt to index out-of-bounds when
+    // the span points to the "end" of the line. For example, a line of
+    // "foo\n" with a highlight_start of 5 is intended to highlight *after*
+    // the line. This needs to compensate since the newline has been removed
+    // from the text slice.
+    let start = (span.text[0].highlight_start - 1).min(text_slice.len());
+    let end = (span.text[0].highlight_end - 1).min(text_slice.len());
+    let lead = text_slice[indent..start].iter().collect();
+    let mut body: String = text_slice[start..end].iter().collect();
+
+    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 we get a DiagnosticSpanLine where highlight_end > text.len(), we prevent an 'out of
+    // bounds' access by making sure the index is within the array bounds.
+    // `saturating_sub` is used in case of an empty file
+    let last_tail_index = last.highlight_end.min(last.text.len()).saturating_sub(1);
+    let last_slice = last.text.chars().collect::<Vec<char>>();
+
+    if span.text.len() > 1 {
+        body.push('\n');
+        body.push_str(
+            &last_slice[indent..last_tail_index]
+                .iter()
+                .collect::<String>(),
+        );
+    }
+    tail.push_str(&last_slice[last_tail_index..].iter().collect::<String>());
+    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(parse_snippet).collect();
+
+    let solutions: Vec<_> = diagnostic
+        .children
+        .iter()
+        .filter_map(|child| {
+            let replacements: Vec<_> = child
+                .spans
+                .iter()
+                .filter(|span| {
+                    use crate::diagnostics::Applicability::*;
+                    use crate::Filter::*;
+
+                    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()
+}