regex_automata::nfa::thompson::pikevm

Struct Builder

source
pub struct Builder { /* private fields */ }
Available on crate features nfa-thompson and nfa-pikevm only.
Expand description

A builder for a PikeVM.

This builder permits configuring options for the syntax of a pattern, the NFA construction and the PikeVM construction. This builder is different from a general purpose regex builder in that it permits fine grain configuration of the construction process. The trade off for this is complexity, and the possibility of setting a configuration that might not make sense. For example, there are two different UTF-8 modes:

Generally speaking, callers will want to either enable all of these or disable all of these.

§Example

This example shows how to disable UTF-8 mode in the syntax and the regex itself. This is generally what you want for matching on arbitrary bytes.

use regex_automata::{
    nfa::thompson::{self, pikevm::PikeVM},
    util::syntax,
    Match,
};

let re = PikeVM::builder()
    .syntax(syntax::Config::new().utf8(false))
    .thompson(thompson::Config::new().utf8(false))
    .build(r"foo(?-u:[^b])ar.*")?;
let mut cache = re.create_cache();

let haystack = b"\xFEfoo\xFFarzz\xE2\x98\xFF\n";
let expected = Some(Match::must(0, 1..9));
let got = re.find_iter(&mut cache, haystack).next();
assert_eq!(expected, got);
// Notice that `(?-u:[^b])` matches invalid UTF-8,
// but the subsequent `.*` does not! Disabling UTF-8
// on the syntax permits this.
//
// N.B. This example does not show the impact of
// disabling UTF-8 mode on a PikeVM Config, since that
// only impacts regexes that can produce matches of
// length 0.
assert_eq!(b"foo\xFFarzz", &haystack[got.unwrap().range()]);

Implementations§

source§

impl Builder

source

pub fn new() -> Builder

Create a new PikeVM builder with its default configuration.

source

pub fn build(&self, pattern: &str) -> Result<PikeVM, BuildError>

Available on crate feature syntax only.

Build a PikeVM from the given pattern.

If there was a problem parsing or compiling the pattern, then an error is returned.

source

pub fn build_many<P: AsRef<str>>( &self, patterns: &[P], ) -> Result<PikeVM, BuildError>

Available on crate feature syntax only.

Build a PikeVM from the given patterns.

source

pub fn build_from_nfa(&self, nfa: NFA) -> Result<PikeVM, BuildError>

Build a PikeVM directly from its NFA.

Note that when using this method, any configuration that applies to the construction of the NFA itself will of course be ignored, since the NFA given here is already built.

source

pub fn configure(&mut self, config: Config) -> &mut Builder

Apply the given PikeVM configuration options to this builder.

source

pub fn syntax(&mut self, config: Config) -> &mut Builder

Available on crate feature syntax only.

Set the syntax configuration for this builder using syntax::Config.

This permits setting things like case insensitivity, Unicode and multi line mode.

These settings only apply when constructing a PikeVM directly from a pattern.

source

pub fn thompson(&mut self, config: Config) -> &mut Builder

Available on crate feature syntax only.

Set the Thompson NFA configuration for this builder using nfa::thompson::Config.

This permits setting things like if additional time should be spent shrinking the size of the NFA.

These settings only apply when constructing a PikeVM directly from a pattern.

Trait Implementations§

source§

impl Clone for Builder

source§

fn clone(&self) -> Builder

Returns a copy of the value. Read more
1.6.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl Debug for Builder

source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> CloneToUninit for T
where T: Clone,

source§

unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for T
where T: Clone,

source§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

source§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.