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// Copyright (c) 2021-2023 Brendan Molloy <brendan@bbqsrc.net>,
// Ilya Solovyiov <ilya.solovyiov@gmail.com>,
// Kai Ren <tyranron@gmail.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! [Cucumber Expressions][0] [AST] into [`Regex`] expansion.
//!
//! Follows original [production rules][1].
//!
//! [`Regex`]: regex::Regex
//! [0]: https://github.com/cucumber/cucumber-expressions#readme
//! [1]: https://git.io/J159T
//! [AST]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
pub mod parameters;
use std::{fmt, iter, str, vec};
use derive_more::{Display, Error, From};
use either::Either;
use nom::{AsChar, InputIter};
use regex::Regex;
use crate::{
parse, Alternation, Alternative, Expression, Optional, Parameter,
SingleAlternation, SingleExpression, Spanned,
};
pub use self::parameters::{
Provider as ParametersProvider, WithCustom as WithCustomParameters,
};
#[allow(clippy::multiple_inherent_impl)] // because of `into-regex` feature
impl<'s> Expression<Spanned<'s>> {
/// Parses the given `input` as an [`Expression`], and immediately expands
/// it into the appropriate [`Regex`].
///
/// # Parameter types
///
/// Text between curly braces references a *parameter type*.
/// [Cucumber Expressions][0] come with the following
/// [built-in parameter types][1]:
///
/// | Parameter Type | Description |
/// | --------------- | ---------------------------------------------- |
/// | `{int}` | Matches integers |
/// | `{float}` | Matches floats |
/// | `{word}` | Matches words without whitespace |
/// | `{string}` | Matches single-quoted or double-quoted strings |
/// | `{}` anonymous | Matches anything (`/.*/`) |
///
/// To expand an [`Expression`] with custom parameter types in addition to
/// the built-in ones, use [`Expression::regex_with_parameters()`].
///
/// # Errors
///
/// See [`Error`] for more details.
///
/// [`Error`]: enum@Error
/// [0]: https://github.com/cucumber/cucumber-expressions#readme
/// [1]: https://github.com/cucumber/cucumber-expressions#parameter-types
pub fn regex<Input: AsRef<str> + ?Sized>(
input: &'s Input,
) -> Result<Regex, Error<Spanned<'s>>> {
let re_str = Expression::parse(input)?
.into_regex_char_iter()
.collect::<Result<String, _>>()?;
Regex::new(&re_str).map_err(Into::into)
}
/// Parses the given `input` as an [`Expression`], and immediately expands
/// it into the appropriate [`Regex`], considering the custom defined
/// `parameters` in addition to [default ones][1].
///
/// # Errors
///
/// See [`Error`] for more details.
///
/// # Example
///
/// ```rust
/// # use std::collections::HashMap;
/// #
/// # use cucumber_expressions::Expression;
/// #
/// let parameters = HashMap::from([("color", "[Rr]ed|[Gg]reen|[Bb]lue")]);
/// let re = Expression::regex_with_parameters(
/// "{word} has {color} eyes",
/// ¶meters,
/// )
/// .unwrap();
///
/// assert_eq!(
/// re.as_str(),
/// "^([^\\s]+) has ([Rr]ed|[Gg]reen|[Bb]lue) eyes$",
/// );
/// ```
///
/// [`Error`]: enum@Error
/// [1]: https://github.com/cucumber/cucumber-expressions#parameter-types
pub fn regex_with_parameters<Input, Parameters>(
input: &'s Input,
parameters: Parameters,
) -> Result<Regex, Error<Spanned<'s>>>
where
Input: AsRef<str> + ?Sized,
Parameters: Clone + ParametersProvider<Spanned<'s>>,
Parameters::Value: InputIter,
<Parameters::Value as InputIter>::Item: AsChar,
{
let re_str = Expression::parse(input)?
.with_parameters(parameters)
.into_regex_char_iter()
.collect::<Result<String, _>>()?;
Regex::new(&re_str).map_err(Into::into)
}
/// Creates a parser, parsing [`Expression`]s and immediately expanding them
/// into appropriate [`Regex`]es, considering the custom defined
/// `parameters` in addition to [default ones][1].
///
/// [1]: https://github.com/cucumber/cucumber-expressions#parameter-types
pub const fn with_parameters<P: ParametersProvider<Spanned<'s>>>(
self,
parameters: P,
) -> WithCustomParameters<Self, P> {
WithCustomParameters {
element: self,
parameters,
}
}
}
/// Possible errors while parsing `Input` representing a
/// [Cucumber Expression][0] and expanding it into a [`Regex`].
///
/// [0]: https://github.com/cucumber/cucumber-expressions#readme
#[derive(Clone, Debug, Display, Error, From)]
pub enum Error<Input>
where
Input: fmt::Display,
{
/// Parsing error.
#[display(fmt = "Parsing failed: {}", _0)]
Parsing(parse::Error<Input>),
/// Expansion error.
#[display(fmt = "Failed to expand regex: {}", _0)]
Expansion(ParameterError<Input>),
/// [`Regex`] creation error.
#[display(fmt = "Regex creation failed: {}", _0)]
Regex(regex::Error),
}
/// Possible [`Parameter`] errors being used in an [`Expression`].
#[derive(Clone, Debug, Display, Error)]
pub enum ParameterError<Input>
where
Input: fmt::Display,
{
/// [`Parameter`] not found.
#[display(fmt = "Parameter `{}` not found.", _0)]
NotFound(Input),
/// Failed to rename [`Regex`] capturing group.
#[display(
fmt = "Failed to rename capturing groups in regex `{}` of \
parameter `{}`: {}",
re,
parameter,
err
)]
RenameRegexGroup {
/// [`Parameter`] name.
parameter: Input,
/// [`Regex`] of the [`Parameter`].
re: String,
/// [`Error`] of parsing the [`Regex`] with renamed capturing groups.
///
/// [`Error`]: regex_syntax::Error
err: Box<regex_syntax::Error>,
},
}
/// Expansion of a [Cucumber Expressions][0] [AST] element into a [`Regex`] by
/// producing a [`char`]s [`Iterator`] following original [production rules][1].
///
/// [0]: https://github.com/cucumber/cucumber-expressions#readme
/// [1]: https://git.io/J159T
/// [AST]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
pub trait IntoRegexCharIter<Input: fmt::Display> {
/// Type of an [`Iterator`] performing the expansion.
type Iter: Iterator<Item = Result<char, ParameterError<Input>>>;
/// Consumes this [AST] element returning an [`Iterator`] over [`char`]s
/// transformable into a [`Regex`].
///
/// [AST]: https://github.com/cucumber/cucumber-expressions#readme
fn into_regex_char_iter(self) -> Self::Iter;
}
impl<Input> IntoRegexCharIter<Input> for Expression<Input>
where
Input: Clone + fmt::Display + InputIter,
<Input as InputIter>::Item: AsChar,
{
type Iter = ExpressionIter<Input>;
fn into_regex_char_iter(self) -> Self::Iter {
let into_regex_char_iter: fn(_) -> _ =
IntoRegexCharIter::into_regex_char_iter;
iter::once(Ok('^'))
.chain(self.0.into_iter().flat_map(into_regex_char_iter))
.chain(iter::once(Ok('$')))
}
}
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// [`IntoRegexCharIter::Iter`] for an [`Expression`].
type ExpressionIter<Input> = iter::Chain<
iter::Chain<
iter::Once<Result<char, ParameterError<Input>>>,
iter::FlatMap<
vec::IntoIter<SingleExpression<Input>>,
<SingleExpression<Input> as IntoRegexCharIter<Input>>::Iter,
fn(
SingleExpression<Input>,
)
-> <SingleExpression<Input> as IntoRegexCharIter<Input>>::Iter,
>,
>,
iter::Once<Result<char, ParameterError<Input>>>,
>;
impl<Input> IntoRegexCharIter<Input> for SingleExpression<Input>
where
Input: Clone + fmt::Display + InputIter,
<Input as InputIter>::Item: AsChar,
{
type Iter = SingleExpressionIter<Input>;
fn into_regex_char_iter(self) -> Self::Iter {
use Either::{Left, Right};
let ok: fn(_) -> _ = Ok;
let as_char: fn(_) -> _ = AsChar::as_char;
match self {
Self::Alternation(alt) => Left(alt.into_regex_char_iter()),
Self::Optional(opt) => Right(Left(opt.into_regex_char_iter())),
Self::Parameter(p) => Right(Right(Left(p.into_regex_char_iter()))),
Self::Text(t) | Self::Whitespaces(t) => Right(Right(Right(
EscapeForRegex::new(t.iter_elements().map(as_char)).map(ok),
))),
}
}
}
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// [`IntoRegexCharIter::Iter`] for a [`SingleExpression`].
type SingleExpressionIter<Input> = Either<
<Alternation<Input> as IntoRegexCharIter<Input>>::Iter,
Either<
<Optional<Input> as IntoRegexCharIter<Input>>::Iter,
Either<
<Parameter<Input> as IntoRegexCharIter<Input>>::Iter,
iter::Map<
EscapeForRegex<
iter::Map<
<Input as InputIter>::IterElem,
fn(<Input as InputIter>::Item) -> char,
>,
>,
MapOkChar<Input>,
>,
>,
>,
>;
impl<Input> IntoRegexCharIter<Input> for Alternation<Input>
where
Input: fmt::Display + InputIter,
<Input as InputIter>::Item: AsChar,
{
type Iter = AlternationIter<Input>;
fn into_regex_char_iter(self) -> Self::Iter {
let ok: fn(_) -> _ = Ok;
let single_alt: fn(SingleAlternation<Input>) -> _ = |alt| {
let into_regex_char_iter: fn(_) -> _ =
IntoRegexCharIter::into_regex_char_iter;
alt.into_iter()
.flat_map(into_regex_char_iter)
.chain(iter::once(Ok('|')))
};
"(?:"
.chars()
.map(ok)
.chain(SkipLast::new(self.0.into_iter().flat_map(single_alt)))
.chain(iter::once(Ok(')')))
}
}
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// [`IntoRegexCharIter::Iter`] for an [`Alternation`].
type AlternationIter<I> = iter::Chain<
iter::Chain<
iter::Map<str::Chars<'static>, MapOkChar<I>>,
SkipLast<
iter::FlatMap<
vec::IntoIter<SingleAlternation<I>>,
AlternationIterInner<I>,
fn(SingleAlternation<I>) -> AlternationIterInner<I>,
>,
>,
>,
iter::Once<Result<char, ParameterError<I>>>,
>;
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// Inner type of an [`AlternationIter`].
type AlternationIterInner<I> = iter::Chain<
iter::FlatMap<
vec::IntoIter<Alternative<I>>,
<Alternative<I> as IntoRegexCharIter<I>>::Iter,
fn(Alternative<I>) -> <Alternative<I> as IntoRegexCharIter<I>>::Iter,
>,
iter::Once<Result<char, ParameterError<I>>>,
>;
impl<Input> IntoRegexCharIter<Input> for Alternative<Input>
where
Input: fmt::Display + InputIter,
<Input as InputIter>::Item: AsChar,
{
type Iter = AlternativeIter<Input>;
fn into_regex_char_iter(self) -> Self::Iter {
use Either::{Left, Right};
let as_char: fn(<Input as InputIter>::Item) -> char = AsChar::as_char;
match self {
Self::Optional(opt) => Left(opt.into_regex_char_iter()),
Self::Text(text) => Right(
EscapeForRegex::new(text.iter_elements().map(as_char)).map(Ok),
),
}
}
}
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// [`IntoRegexCharIter::Iter`] for an [`Alternative`].
type AlternativeIter<Input> = Either<
<Optional<Input> as IntoRegexCharIter<Input>>::Iter,
iter::Map<
EscapeForRegex<
iter::Map<
<Input as InputIter>::IterElem,
fn(<Input as InputIter>::Item) -> char,
>,
>,
MapOkChar<Input>,
>,
>;
impl<Input> IntoRegexCharIter<Input> for Optional<Input>
where
Input: fmt::Display + InputIter,
<Input as InputIter>::Item: AsChar,
{
type Iter = OptionalIter<Input>;
fn into_regex_char_iter(self) -> Self::Iter {
let as_char: fn(<Input as InputIter>::Item) -> char = AsChar::as_char;
"(?:"
.chars()
.chain(EscapeForRegex::new(self.0.iter_elements().map(as_char)))
.chain(")?".chars())
.map(Ok)
}
}
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// [`IntoRegexCharIter::Iter`] for an [`Optional`].
type OptionalIter<Input> = iter::Map<
iter::Chain<
iter::Chain<
str::Chars<'static>,
EscapeForRegex<
iter::Map<
<Input as InputIter>::IterElem,
fn(<Input as InputIter>::Item) -> char,
>,
>,
>,
str::Chars<'static>,
>,
MapOkChar<Input>,
>;
/// Function pointer describing [`Ok`].
type MapOkChar<Input> = fn(char) -> Result<char, ParameterError<Input>>;
impl<Input> IntoRegexCharIter<Input> for Parameter<Input>
where
Input: Clone + fmt::Display + InputIter,
<Input as InputIter>::Item: AsChar,
{
type Iter = ParameterIter<Input>;
fn into_regex_char_iter(self) -> Self::Iter {
use Either::{Left, Right};
let eq = |i: &Input, str: &str| {
i.iter_elements().map(AsChar::as_char).eq(str.chars())
};
if eq(&self.input, "int") {
Left(Left(r#"((?:-?\d+)|(?:\d+))"#.chars().map(Ok)))
} else if eq(&self.input, "float") {
// Regex in other implementations has lookaheads. As `regex` crate
// doesn't support them, we use `f32`/`f64` grammar instead:
// https://doc.rust-lang.org/stable/std/primitive.f64.html#grammar
// Provided grammar is a superset of the original one:
// - supports `e` as exponent in addition to `E`
// - supports trailing comma: `1.`
// - supports `inf` and `NaN`
Left(Left(
"([+-]?(?:inf\
|NaN\
|(?:\\d+|\\d+\\.\\d*|\\d*\\.\\d+)(?:[eE][+-]?\\d+)?\
))"
.chars()
.map(Ok),
))
} else if eq(&self.input, "word") {
Left(Left(r#"([^\s]+)"#.chars().map(Ok)))
} else if eq(&self.input, "string") {
Left(Right(
OwnedChars::new(format!(
"(?:\
\"(?P<__{id}_0>[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*)\"\
|'(?P<__{id}_1>[^'\\\\]*(?:\\\\.[^'\\\\]*)*)'\
)",
id = self.id,
))
.map(Ok),
))
} else if eq(&self.input, "") {
Left(Left(r#"(.*)"#.chars().map(Ok)))
} else {
Right(iter::once(Err(ParameterError::NotFound(self.input))))
}
}
}
// TODO: Replace with TAIT, once stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// [`IntoRegexCharIter::Iter`] for a [`Parameter`].
type ParameterIter<Input> = Either<
Either<
iter::Map<
str::Chars<'static>,
fn(char) -> Result<char, ParameterError<Input>>,
>,
iter::Map<OwnedChars, fn(char) -> Result<char, ParameterError<Input>>>,
>,
iter::Once<Result<char, ParameterError<Input>>>,
>;
/// [`Iterator`] for skipping a last [`Item`].
///
/// [`Item`]: Iterator::Item
pub struct SkipLast<Iter: Iterator> {
/// Inner [`Iterator`] to skip the last [`Item`] from.
///
/// [`Item`]: Iterator::Item
iter: iter::Peekable<Iter>,
}
impl<Iter> Clone for SkipLast<Iter>
where
Iter: Clone + Iterator,
Iter::Item: Clone,
{
fn clone(&self) -> Self {
Self {
iter: self.iter.clone(),
}
}
}
impl<Iter> fmt::Debug for SkipLast<Iter>
where
Iter: fmt::Debug + Iterator,
Iter::Item: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("SkipLast")
.field("iter", &self.iter)
.finish()
}
}
impl<Iter: Iterator> SkipLast<Iter> {
/// Creates a new [`SkipLast`] [`Iterator`].
pub fn new(iter: Iter) -> Self {
Self {
iter: iter.peekable(),
}
}
}
impl<Iter> Iterator for SkipLast<Iter>
where
Iter: Iterator,
{
type Item = Iter::Item;
fn next(&mut self) -> Option<Self::Item> {
let next = self.iter.next();
(self.iter.peek().is_some()).then_some(next).flatten()
}
}
// TODO: Make private, once TAIT stabilized:
// https://github.com/rust-lang/rust/issues/63063
/// Like [`str::Chars`] [`Iterator`], but owns its [`String`].
#[derive(Clone, Debug)]
pub struct OwnedChars {
/// Iterated [`String`].
str: String,
/// Current char number.
cur: usize,
}
impl OwnedChars {
/// Creates a new [`OwnedChars`] [`Iterator`].
#[must_use]
pub const fn new(str: String) -> Self {
Self { str, cur: 0 }
}
}
impl Iterator for OwnedChars {
type Item = char;
fn next(&mut self) -> Option<Self::Item> {
let char = self.str.chars().nth(self.cur)?;
self.cur += 1;
Some(char)
}
}
/// [`Iterator`] for escaping `^`, `$`, `[`, `]`, `(`, `)`, `{`, `}`, `.`, `|`,
/// `?`, `*`, `+` with `\`, and removing it for other [`char`]s.
///
/// # Example
///
/// ```rust
/// # use cucumber_expressions::expand::EscapeForRegex;
/// #
/// assert_eq!(
/// EscapeForRegex::new("\\\\text\\ (\\)\\".chars()).collect::<String>(),
/// "\\\\text \\(\\)",
/// );
/// ```
#[derive(Clone, Debug)]
pub struct EscapeForRegex<Iter: Iterator> {
/// Inner [`Iterator`] for escaping.
iter: iter::Peekable<Iter>,
/// [`Item`] that was escaped.
///
/// [`Item`]: Iterator::Item
was_escaped: Option<Iter::Item>,
}
impl<Iter: Iterator> EscapeForRegex<Iter> {
/// Creates a new [`EscapeForRegex`] [`Iterator`].
pub fn new(iter: Iter) -> Self {
Self {
iter: iter.peekable(),
was_escaped: None,
}
}
}
impl<Iter> Iterator for EscapeForRegex<Iter>
where
Iter: Iterator<Item = char>,
{
type Item = char;
fn next(&mut self) -> Option<Self::Item> {
let should_be_escaped = |c| "^$[]()\\{}.|?*+".contains(c);
if self.was_escaped.is_some() {
return self.was_escaped.take();
}
loop {
return match self.iter.next() {
Some('\\') => {
let c = *self.iter.peek()?;
if should_be_escaped(c) {
self.was_escaped = self.iter.next();
Some('\\')
} else {
continue;
}
}
Some(c) if should_be_escaped(c) => {
self.was_escaped = Some(c);
Some('\\')
}
Some(c) => Some(c),
None => None,
};
}
}
}
// All test examples from: <https://git.io/J159G>
// Naming of test cases is preserved.
#[cfg(test)]
mod spec {
use super::{Error, Expression, ParameterError};
#[test]
fn alternation_with_optional() {
let expr = Expression::regex("a/b(c)")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^(?:a|b(?:c)?)$");
}
#[test]
fn alternation() {
let expr = Expression::regex("a/b c/d/e")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^(?:a|b) (?:c|d|e)$");
assert!(expr.is_match("a c"));
assert!(expr.is_match("b e"));
assert!(!expr.is_match("c e"));
assert!(!expr.is_match("a"));
assert!(!expr.is_match("a "));
}
#[test]
fn empty() {
let expr =
Expression::regex("").unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^$");
assert!(expr.is_match(""));
assert!(!expr.is_match("a"));
}
#[test]
fn escape_regex_characters() {
let expr = Expression::regex(r"^$[]\()\{}\\.|?*+")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), r"^\^\$\[\]\(\)\{\}\\\.\|\?\*\+$");
assert!(expr.is_match("^$[](){}\\.|?*+"));
}
#[test]
fn optional() {
let expr =
Expression::regex("(a)").unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^(?:a)?$");
assert!(expr.is_match(""));
assert!(expr.is_match("a"));
assert!(!expr.is_match("b"));
}
#[test]
fn parameter_int() {
let expr = Expression::regex("{int}")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^((?:-?\\d+)|(?:\\d+))$");
assert!(expr.is_match("123"));
assert!(expr.is_match("-123"));
assert!(!expr.is_match("+123"));
assert!(!expr.is_match("123."));
}
#[test]
fn parameter_float() {
let expr = Expression::regex("{float}")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(
expr.as_str(),
"^([+-]?(?:inf\
|NaN\
|(?:\\d+|\\d+\\.\\d*|\\d*\\.\\d+)(?:[eE][+-]?\\d+)?\
))$",
);
assert!(expr.is_match("+1"));
assert!(expr.is_match(".1"));
assert!(expr.is_match("-.1"));
assert!(expr.is_match("-1."));
assert!(expr.is_match("-1.1E+1"));
assert!(expr.is_match("-inf"));
assert!(expr.is_match("NaN"));
}
#[test]
fn parameter_word() {
let expr = Expression::regex("{word}")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^([^\\s]+)$");
assert!(expr.is_match("test"));
assert!(expr.is_match("\"test\""));
assert!(!expr.is_match("with space"));
}
#[test]
fn parameter_string() {
let expr = Expression::regex("{string}")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(
expr.as_str(),
"^(?:\
\"(?P<__0_0>[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*)\"\
|'(?P<__0_1>[^'\\\\]*(?:\\\\.[^'\\\\]*)*)'\
)$",
);
assert!(expr.is_match("\"\""));
assert!(expr.is_match("''"));
assert!(expr.is_match("'with \"'"));
assert!(expr.is_match("\"with '\""));
assert!(expr.is_match("\"with \\\" escaped\""));
assert!(expr.is_match("'with \\' escaped'"));
assert!(!expr.is_match("word"));
}
#[test]
fn multiple_string_parameters() {
let expr = Expression::regex("{string} {string}")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(
expr.as_str(),
"^(?:\
\"(?P<__0_0>[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*)\"\
|'(?P<__0_1>[^'\\\\]*(?:\\\\.[^'\\\\]*)*)'\
) (?:\
\"(?P<__1_0>[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*)\"\
|'(?P<__1_1>[^'\\\\]*(?:\\\\.[^'\\\\]*)*)'\
)$",
);
assert!(expr.is_match("\"\" ''"));
assert!(expr.is_match("'' \"\""));
assert!(expr.is_match("'with \"' \"\""));
assert!(expr.is_match("\"with '\" '\"'"));
assert!(expr.is_match("\"with \\\" escaped\" 'with \\' escaped'"));
assert!(expr.is_match("'with \\' escaped' \"with \\\" escaped\""));
}
#[test]
fn parameter_all() {
let expr =
Expression::regex("{}").unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^(.*)$");
assert!(expr.is_match("anything matches"));
}
#[test]
fn text() {
let expr =
Expression::regex("a").unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^a$");
assert!(expr.is_match("a"));
assert!(!expr.is_match("b"));
assert!(!expr.is_match("ab"));
}
#[test]
fn unicode() {
let expr = Expression::regex("Привет, Мир(ы)!")
.unwrap_or_else(|e| panic!("failed: {e}"));
assert_eq!(expr.as_str(), "^Привет, Мир(?:ы)?!$");
assert!(expr.is_match("Привет, Мир!"));
assert!(expr.is_match("Привет, Миры!"));
assert!(!expr.is_match("Hello world"));
}
#[test]
fn unknown_parameter() {
match Expression::regex("{custom}").unwrap_err() {
Error::Expansion(ParameterError::NotFound(not_found)) => {
assert_eq!(*not_found, "custom");
}
e @ (Error::Parsing(_) | Error::Regex(_) | Error::Expansion(_)) => {
panic!("wrong err: {e}");
}
}
}
}