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| </pre><pre class="rust"><code><span class="doccomment">/*! |
| A library for finding occurrences of many patterns at once. This library |
| provides multiple pattern search principally through an implementation of the |
| [Aho-Corasick algorithm](https://en.wikipedia.org/wiki/Aho%E2%80%93Corasick_algorithm), |
| which builds a fast finite state machine for executing searches in linear time. |
| |
| Additionally, this library provides a number of configuration options for |
| building the automaton that permit controlling the space versus time trade |
| off. Other features include simple ASCII case insensitive matching, finding |
| overlapping matches, replacements, searching streams and even searching and |
| replacing text in streams. |
| |
| Finally, unlike most other Aho-Corasick implementations, this one |
| supports enabling [leftmost-first](MatchKind::LeftmostFirst) or |
| [leftmost-longest](MatchKind::LeftmostLongest) match semantics, using a |
| (seemingly) novel alternative construction algorithm. For more details on what |
| match semantics means, see the [`MatchKind`] type. |
| |
| # Overview |
| |
| This section gives a brief overview of the primary types in this crate: |
| |
| * [`AhoCorasick`] is the primary type and represents an Aho-Corasick automaton. |
| This is the type you use to execute searches. |
| * [`AhoCorasickBuilder`] can be used to build an Aho-Corasick automaton, and |
| supports configuring a number of options. |
| * [`Match`] represents a single match reported by an Aho-Corasick automaton. |
| Each match has two pieces of information: the pattern that matched and the |
| start and end byte offsets corresponding to the position in the haystack at |
| which it matched. |
| |
| # Example: basic searching |
| |
| This example shows how to search for occurrences of multiple patterns |
| simultaneously. Each match includes the pattern that matched along with the |
| byte offsets of the match. |
| |
| ``` |
| use aho_corasick::{AhoCorasick, PatternID}; |
| |
| let patterns = &["apple", "maple", "Snapple"]; |
| let haystack = "Nobody likes maple in their apple flavored Snapple."; |
| |
| let ac = AhoCorasick::new(patterns).unwrap(); |
| let mut matches = vec![]; |
| for mat in ac.find_iter(haystack) { |
| matches.push((mat.pattern(), mat.start(), mat.end())); |
| } |
| assert_eq!(matches, vec![ |
| (PatternID::must(1), 13, 18), |
| (PatternID::must(0), 28, 33), |
| (PatternID::must(2), 43, 50), |
| ]); |
| ``` |
| |
| # Example: case insensitivity |
| |
| This is like the previous example, but matches `Snapple` case insensitively |
| using `AhoCorasickBuilder`: |
| |
| ``` |
| use aho_corasick::{AhoCorasick, PatternID}; |
| |
| let patterns = &["apple", "maple", "snapple"]; |
| let haystack = "Nobody likes maple in their apple flavored Snapple."; |
| |
| let ac = AhoCorasick::builder() |
| .ascii_case_insensitive(true) |
| .build(patterns) |
| .unwrap(); |
| let mut matches = vec![]; |
| for mat in ac.find_iter(haystack) { |
| matches.push((mat.pattern(), mat.start(), mat.end())); |
| } |
| assert_eq!(matches, vec![ |
| (PatternID::must(1), 13, 18), |
| (PatternID::must(0), 28, 33), |
| (PatternID::must(2), 43, 50), |
| ]); |
| ``` |
| |
| # Example: replacing matches in a stream |
| |
| This example shows how to execute a search and replace on a stream without |
| loading the entire stream into memory first. |
| |
| ``` |
| # #[cfg(feature = "std")] { |
| use aho_corasick::AhoCorasick; |
| |
| # fn example() -> Result<(), std::io::Error> { |
| let patterns = &["fox", "brown", "quick"]; |
| let replace_with = &["sloth", "grey", "slow"]; |
| |
| // In a real example, these might be `std::fs::File`s instead. All you need to |
| // do is supply a pair of `std::io::Read` and `std::io::Write` implementations. |
| let rdr = "The quick brown fox."; |
| let mut wtr = vec![]; |
| |
| let ac = AhoCorasick::new(patterns).unwrap(); |
| ac.try_stream_replace_all(rdr.as_bytes(), &mut wtr, replace_with)?; |
| assert_eq!(b"The slow grey sloth.".to_vec(), wtr); |
| # Ok(()) }; example().unwrap() |
| # } |
| ``` |
| |
| # Example: finding the leftmost first match |
| |
| In the textbook description of Aho-Corasick, its formulation is typically |
| structured such that it reports all possible matches, even when they overlap |
| with another. In many cases, overlapping matches may not be desired, such as |
| the case of finding all successive non-overlapping matches like you might with |
| a standard regular expression. |
| |
| Unfortunately the "obvious" way to modify the Aho-Corasick algorithm to do |
| this doesn't always work in the expected way, since it will report matches as |
| soon as they are seen. For example, consider matching the regex `Samwise|Sam` |
| against the text `Samwise`. Most regex engines (that are Perl-like, or |
| non-POSIX) will report `Samwise` as a match, but the standard Aho-Corasick |
| algorithm modified for reporting non-overlapping matches will report `Sam`. |
| |
| A novel contribution of this library is the ability to change the match |
| semantics of Aho-Corasick (without additional search time overhead) such that |
| `Samwise` is reported instead. For example, here's the standard approach: |
| |
| ``` |
| use aho_corasick::AhoCorasick; |
| |
| let patterns = &["Samwise", "Sam"]; |
| let haystack = "Samwise"; |
| |
| let ac = AhoCorasick::new(patterns).unwrap(); |
| let mat = ac.find(haystack).expect("should have a match"); |
| assert_eq!("Sam", &haystack[mat.start()..mat.end()]); |
| ``` |
| |
| And now here's the leftmost-first version, which matches how a Perl-like |
| regex will work: |
| |
| ``` |
| use aho_corasick::{AhoCorasick, MatchKind}; |
| |
| let patterns = &["Samwise", "Sam"]; |
| let haystack = "Samwise"; |
| |
| let ac = AhoCorasick::builder() |
| .match_kind(MatchKind::LeftmostFirst) |
| .build(patterns) |
| .unwrap(); |
| let mat = ac.find(haystack).expect("should have a match"); |
| assert_eq!("Samwise", &haystack[mat.start()..mat.end()]); |
| ``` |
| |
| In addition to leftmost-first semantics, this library also supports |
| leftmost-longest semantics, which match the POSIX behavior of a regular |
| expression alternation. See [`MatchKind`] for more details. |
| |
| # Prefilters |
| |
| While an Aho-Corasick automaton can perform admirably when compared to more |
| naive solutions, it is generally slower than more specialized algorithms that |
| are accelerated using vector instructions such as SIMD. |
| |
| For that reason, this library will internally use a "prefilter" to attempt |
| to accelerate searches when possible. Currently, this library has several |
| different algorithms it might use depending on the patterns provided. Once the |
| number of patterns gets too big, prefilters are no longer used. |
| |
| While a prefilter is generally good to have on by default since it works |
| well in the common case, it can lead to less predictable or even sub-optimal |
| performance in some cases. For that reason, prefilters can be explicitly |
| disabled via [`AhoCorasickBuilder::prefilter`]. |
| |
| # Lower level APIs |
| |
| This crate also provides several sub-modules that collectively expose many of |
| the implementation details of the main [`AhoCorasick`] type. Most users of this |
| library can completely ignore the submodules and their contents, but if you |
| needed finer grained control, some parts of them may be useful to you. Here is |
| a brief overview of each and why you might want to use them: |
| |
| * The [`packed`] sub-module contains a lower level API for using fast |
| vectorized routines for finding a small number of patterns in a haystack. |
| You might want to use this API when you want to completely side-step using |
| Aho-Corasick automata. Otherwise, the fast vectorized routines are used |
| automatically as prefilters for `AhoCorasick` searches whenever possible. |
| * The [`automaton`] sub-module provides a lower level finite state |
| machine interface that the various Aho-Corasick implementations in |
| this crate implement. This sub-module's main contribution is the |
| [`Automaton`](automaton::Automaton) trait, which permits manually walking the |
| state transitions of an Aho-Corasick automaton. |
| * The [`dfa`] and [`nfa`] sub-modules provide DFA and NFA implementations of |
| the aforementioned `Automaton` trait. The main reason one might want to use |
| these sub-modules is to get access to a type that implements the `Automaton` |
| trait. (The top-level `AhoCorasick` type does not implement the `Automaton` |
| trait.) |
| |
| As mentioned above, if you aren't sure whether you need these sub-modules, |
| you should be able to safely ignore them and just focus on the [`AhoCorasick`] |
| type. |
| |
| # Crate features |
| |
| This crate exposes a few features for controlling dependency usage and whether |
| this crate can be used without the standard library. |
| |
| * **std** - |
| Enables support for the standard library. This feature is enabled by |
| default. When disabled, only `core` and `alloc` are used. At an API |
| level, enabling `std` enables `std::error::Error` trait impls for the |
| various error types, and higher level stream search routines such as |
| [`AhoCorasick::try_stream_find_iter`]. But the `std` feature is also required |
| to enable vectorized prefilters. Prefilters can greatly accelerate searches, |
| but generally only apply when the number of patterns is small (less than |
| ~100). |
| * **perf-literal** - |
| Enables support for literal prefilters that use vectorized routines from |
| external crates. This feature is enabled by default. If you're only using |
| Aho-Corasick for large numbers of patterns or otherwise can abide lower |
| throughput when searching with a small number of patterns, then it is |
| reasonable to disable this feature. |
| * **logging** - |
| Enables a dependency on the `log` crate and emits messages to aide in |
| diagnostics. This feature is disabled by default. |
| */ |
| |
| </span><span class="attribute">#![no_std] |
| #![deny(missing_docs)] |
| #![deny(rustdoc::broken_intra_doc_links)] |
| #![cfg_attr(docsrs, feature(doc_auto_cfg))] |
| |
| </span><span class="kw">extern crate </span>alloc; |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"std"</span>))] |
| </span><span class="kw">extern crate </span>std; |
| |
| <span class="attribute">#[cfg(doctest)] |
| </span><span class="macro">doc_comment::doctest!</span>(<span class="string">"../README.md"</span>); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">pub use </span><span class="kw">crate</span>::ahocorasick::StreamFindIter; |
| <span class="kw">pub use crate</span>::{ |
| ahocorasick::{ |
| AhoCorasick, AhoCorasickBuilder, AhoCorasickKind, FindIter, |
| FindOverlappingIter, |
| }, |
| util::{ |
| error::{BuildError, MatchError, MatchErrorKind}, |
| primitives::{PatternID, PatternIDError}, |
| search::{Anchored, Input, Match, MatchKind, Span, StartKind}, |
| }, |
| }; |
| |
| <span class="attribute">#[macro_use] |
| </span><span class="kw">mod </span>macros; |
| |
| <span class="kw">mod </span>ahocorasick; |
| <span class="kw">pub mod </span>automaton; |
| <span class="kw">pub mod </span>dfa; |
| <span class="kw">pub mod </span>nfa; |
| <span class="kw">pub mod </span>packed; |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests; |
| <span class="comment">// I wrote out the module for implementing fst::Automaton only to later realize |
| // that this would make fst a public dependency and fst is not at 1.0 yet. I |
| // decided to just keep the code in tree, but build it only during tests. |
| // |
| // TODO: I think I've changed my mind again. I'm considering pushing it out |
| // into either a separate crate or into 'fst' directly as an optional feature. |
| // #[cfg(test)] |
| // #[allow(dead_code)] |
| // mod transducer; |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>util; |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>testoibits { |
| <span class="kw">use </span>std::panic::{RefUnwindSafe, UnwindSafe}; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">fn </span>assert_all<T: Send + Sync + UnwindSafe + RefUnwindSafe>() {} |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>oibits_main() { |
| assert_all::<AhoCorasick>(); |
| assert_all::<AhoCorasickBuilder>(); |
| assert_all::<AhoCorasickKind>(); |
| assert_all::<FindIter>(); |
| assert_all::<FindOverlappingIter>(); |
| |
| assert_all::<BuildError>(); |
| assert_all::<MatchError>(); |
| assert_all::<MatchErrorKind>(); |
| |
| assert_all::<Anchored>(); |
| assert_all::<Input>(); |
| assert_all::<Match>(); |
| assert_all::<MatchKind>(); |
| assert_all::<Span>(); |
| assert_all::<StartKind>(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>oibits_automaton() { |
| <span class="kw">use crate</span>::{automaton, dfa::DFA}; |
| |
| assert_all::<automaton::FindIter<DFA>>(); |
| assert_all::<automaton::FindOverlappingIter<DFA>>(); |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span>assert_all::<automaton::StreamFindIter<DFA, std::io::Stdin>>(); |
| assert_all::<automaton::OverlappingState>(); |
| |
| assert_all::<automaton::Prefilter>(); |
| assert_all::<automaton::Candidate>(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>oibits_packed() { |
| <span class="kw">use </span><span class="kw">crate</span>::packed; |
| |
| assert_all::<packed::Config>(); |
| assert_all::<packed::Builder>(); |
| assert_all::<packed::Searcher>(); |
| assert_all::<packed::FindIter>(); |
| assert_all::<packed::MatchKind>(); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="aho_corasick" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |