Struct Printer

pub struct Printer { /* private fields */ }

A printer for a regular expression’s high-level intermediate representation.

A printer converts a high-level intermediate representation (HIR) to a regular expression pattern string. This particular printer uses constant stack space and heap space proportional to the size of the HIR.

Since this printer is only using the HIR, the pattern it prints will likely not resemble the original pattern at all. For example, a pattern like \pL will have its entire class written out.

The purpose of this printer is to provide a means to mutate an HIR and then build a regular expression from the result of that mutation. (A regex library could provide a constructor from this HIR explicitly, but that creates an unnecessary public coupling between the regex library and this specific HIR representation.)

Implementations

impl Printer

pub fn new() -> Printer

Create a new printer.

pub fn print<W: Write>(&mut self, hir: &Hir, wtr: W) -> Result

Print the given Ast to the given writer. The writer must implement fmt::Write. Typical implementations of fmt::Write that can be used here are a fmt::Formatter (which is available in fmt::Display implementations) or a &mut String.

Trait Implementations

impl Debug for Printer

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

Formats the value using the given formatter.