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|
use std::{borrow::Cow, cell::OnceCell, fmt, io, path::Path, time};
use {
bstr::ByteVec,
grep_matcher::{Captures, LineTerminator, Match, Matcher},
grep_searcher::{
LineIter, Searcher, SinkContext, SinkContextKind, SinkError, SinkMatch,
},
};
use crate::{hyperlink::HyperlinkPath, MAX_LOOK_AHEAD};
/// A type for handling replacements while amortizing allocation.
pub(crate) struct Replacer<M: Matcher> {
space: Option<Space<M>>,
}
struct Space<M: Matcher> {
/// The place to store capture locations.
caps: M::Captures,
/// The place to write a replacement to.
dst: Vec<u8>,
/// The place to store match offsets in terms of `dst`.
matches: Vec<Match>,
}
impl<M: Matcher> fmt::Debug for Replacer<M> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let (dst, matches) = self.replacement().unwrap_or((&[], &[]));
f.debug_struct("Replacer")
.field("dst", &dst)
.field("matches", &matches)
.finish()
}
}
impl<M: Matcher> Replacer<M> {
/// Create a new replacer for use with a particular matcher.
///
/// This constructor does not allocate. Instead, space for dealing with
/// replacements is allocated lazily only when needed.
pub(crate) fn new() -> Replacer<M> {
Replacer { space: None }
}
/// Executes a replacement on the given haystack string by replacing all
/// matches with the given replacement. To access the result of the
/// replacement, use the `replacement` method.
///
/// This can fail if the underlying matcher reports an error.
pub(crate) fn replace_all<'a>(
&'a mut self,
searcher: &Searcher,
matcher: &M,
mut haystack: &[u8],
range: std::ops::Range<usize>,
replacement: &[u8],
) -> io::Result<()> {
// See the giant comment in 'find_iter_at_in_context' below for why we
// do this dance.
let is_multi_line = searcher.multi_line_with_matcher(&matcher);
if is_multi_line {
if haystack[range.end..].len() >= MAX_LOOK_AHEAD {
haystack = &haystack[..range.end + MAX_LOOK_AHEAD];
}
} else {
// When searching a single line, we should remove the line
// terminator. Otherwise, it's possible for the regex (via
// look-around) to observe the line terminator and not match
// because of it.
let mut m = Match::new(0, range.end);
trim_line_terminator(searcher, haystack, &mut m);
haystack = &haystack[..m.end()];
}
{
let &mut Space { ref mut dst, ref mut caps, ref mut matches } =
self.allocate(matcher)?;
dst.clear();
matches.clear();
replace_with_captures_in_context(
matcher,
haystack,
range.clone(),
caps,
dst,
|caps, dst| {
let start = dst.len();
caps.interpolate(
|name| matcher.capture_index(name),
haystack,
replacement,
dst,
);
let end = dst.len();
matches.push(Match::new(start, end));
true
},
)
.map_err(io::Error::error_message)?;
}
Ok(())
}
/// Return the result of the prior replacement and the match offsets for
/// all replacement occurrences within the returned replacement buffer.
///
/// If no replacement has occurred then `None` is returned.
pub(crate) fn replacement<'a>(
&'a self,
) -> Option<(&'a [u8], &'a [Match])> {
match self.space {
None => None,
Some(ref space) => {
if space.matches.is_empty() {
None
} else {
Some((&space.dst, &space.matches))
}
}
}
}
/// Clear space used for performing a replacement.
///
/// Subsequent calls to `replacement` after calling `clear` (but before
/// executing another replacement) will always return `None`.
pub(crate) fn clear(&mut self) {
if let Some(ref mut space) = self.space {
space.dst.clear();
space.matches.clear();
}
}
/// Allocate space for replacements when used with the given matcher and
/// return a mutable reference to that space.
///
/// This can fail if allocating space for capture locations from the given
/// matcher fails.
fn allocate(&mut self, matcher: &M) -> io::Result<&mut Space<M>> {
if self.space.is_none() {
let caps =
matcher.new_captures().map_err(io::Error::error_message)?;
self.space = Some(Space { caps, dst: vec![], matches: vec![] });
}
Ok(self.space.as_mut().unwrap())
}
}
/// A simple layer of abstraction over either a match or a contextual line
/// reported by the searcher.
///
/// In particular, this provides an API that unions the `SinkMatch` and
/// `SinkContext` types while also exposing a list of all individual match
/// locations.
///
/// While this serves as a convenient mechanism to abstract over `SinkMatch`
/// and `SinkContext`, this also provides a way to abstract over replacements.
/// Namely, after a replacement, a `Sunk` value can be constructed using the
/// results of the replacement instead of the bytes reported directly by the
/// searcher.
#[derive(Debug)]
pub(crate) struct Sunk<'a> {
bytes: &'a [u8],
absolute_byte_offset: u64,
line_number: Option<u64>,
context_kind: Option<&'a SinkContextKind>,
matches: &'a [Match],
original_matches: &'a [Match],
}
impl<'a> Sunk<'a> {
#[inline]
pub(crate) fn empty() -> Sunk<'static> {
Sunk {
bytes: &[],
absolute_byte_offset: 0,
line_number: None,
context_kind: None,
matches: &[],
original_matches: &[],
}
}
#[inline]
pub(crate) fn from_sink_match(
sunk: &'a SinkMatch<'a>,
original_matches: &'a [Match],
replacement: Option<(&'a [u8], &'a [Match])>,
) -> Sunk<'a> {
let (bytes, matches) =
replacement.unwrap_or_else(|| (sunk.bytes(), original_matches));
Sunk {
bytes,
absolute_byte_offset: sunk.absolute_byte_offset(),
line_number: sunk.line_number(),
context_kind: None,
matches,
original_matches,
}
}
#[inline]
pub(crate) fn from_sink_context(
sunk: &'a SinkContext<'a>,
original_matches: &'a [Match],
replacement: Option<(&'a [u8],
|