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d9ca529356
libripgrep is not any one library, but rather, a collection of libraries that roughly separate the following key distinct phases in a grep implementation: 1. Pattern matching (e.g., by a regex engine). 2. Searching a file using a pattern matcher. 3. Printing results. Ultimately, both (1) and (3) are defined by de-coupled interfaces, of which there may be multiple implementations. Namely, (1) is satisfied by the `Matcher` trait in the `grep-matcher` crate and (3) is satisfied by the `Sink` trait in the `grep2` crate. The searcher (2) ties everything together and finds results using a matcher and reports those results using a `Sink` implementation. Closes #162
91 lines
2.1 KiB
Rust
91 lines
2.1 KiB
Rust
use std::io::{self, Write};
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use termcolor::{ColorSpec, WriteColor};
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/// A writer that counts the number of bytes that have been successfully
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/// written.
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#[derive(Clone, Debug)]
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pub struct CounterWriter<W> {
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wtr: W,
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count: u64,
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total_count: u64,
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}
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impl<W: Write> CounterWriter<W> {
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pub fn new(wtr: W) -> CounterWriter<W> {
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CounterWriter { wtr: wtr, count: 0, total_count: 0 }
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}
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}
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impl<W> CounterWriter<W> {
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/// Returns the total number of bytes written since construction or the
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/// last time `reset` was called.
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pub fn count(&self) -> u64 {
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self.count
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}
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/// Returns the total number of bytes written since construction.
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pub fn total_count(&self) -> u64 {
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self.total_count + self.count
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}
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/// Resets the number of bytes written to `0`.
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pub fn reset_count(&mut self) {
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self.total_count += self.count;
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self.count = 0;
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}
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/// Clear resets all counting related state for this writer.
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///
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/// After this call, the total count of bytes written to the underlying
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/// writer is erased and reset.
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#[allow(dead_code)]
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pub fn clear(&mut self) {
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self.count = 0;
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self.total_count = 0;
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}
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#[allow(dead_code)]
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pub fn get_ref(&self) -> &W {
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&self.wtr
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}
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pub fn get_mut(&mut self) -> &mut W {
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&mut self.wtr
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}
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pub fn into_inner(self) -> W {
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self.wtr
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}
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}
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impl<W: Write> Write for CounterWriter<W> {
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fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
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let n = self.wtr.write(buf)?;
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self.count += n as u64;
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Ok(n)
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}
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fn flush(&mut self) -> Result<(), io::Error> {
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self.wtr.flush()
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}
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}
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impl<W: WriteColor> WriteColor for CounterWriter<W> {
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fn supports_color(&self) -> bool {
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self.wtr.supports_color()
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}
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fn set_color(&mut self, spec: &ColorSpec) -> io::Result<()> {
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self.wtr.set_color(spec)
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}
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fn reset(&mut self) -> io::Result<()> {
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self.wtr.reset()
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}
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fn is_synchronous(&self) -> bool {
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self.wtr.is_synchronous()
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}
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}
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