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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
30 lines
806 B
Rust
30 lines
806 B
Rust
/// Converts an arbitrary sequence of bytes to a literal suitable for building
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/// a regular expression.
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pub fn bytes_to_regex(bs: &[u8]) -> String {
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use std::fmt::Write;
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use regex_syntax::is_meta_character;
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let mut s = String::with_capacity(bs.len());
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for &b in bs {
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if b <= 0x7F && !is_meta_character(b as char) {
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write!(s, r"{}", b as char).unwrap();
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} else {
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write!(s, r"\x{:02x}", b).unwrap();
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}
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}
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s
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}
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/// Converts arbitrary bytes to a nice string.
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pub fn show_bytes(bs: &[u8]) -> String {
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use std::ascii::escape_default;
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use std::str;
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let mut nice = String::new();
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for &b in bs {
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let part: Vec<u8> = escape_default(b).collect();
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nice.push_str(str::from_utf8(&part).unwrap());
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}
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nice
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}
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