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// Copyright (c) 2018 The predicates-rs Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/license/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.
use std::ffi;
use std::fmt;
use std::str;
use crate::reflection;
#[cfg(feature = "normalize-line-endings")]
use crate::str::normalize::NormalizedPredicate;
use crate::Predicate;
/// Predicate adaper that trims the variable being tested.
///
/// This is created by `pred.trim()`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct TrimPredicate<P>
where
P: Predicate<str>,
{
p: P,
}
impl<P> Predicate<str> for TrimPredicate<P>
where
P: Predicate<str>,
{
fn eval(&self, variable: &str) -> bool {
self.p.eval(variable.trim())
}
fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<reflection::Case<'a>> {
self.p.find_case(expected, variable.trim())
}
}
impl<P> reflection::PredicateReflection for TrimPredicate<P>
where
P: Predicate<str>,
{
fn children<'a>(&'a self) -> Box<dyn Iterator<Item = reflection::Child<'a>> + 'a> {
let params = vec![reflection::Child::new("predicate", &self.p)];
Box::new(params.into_iter())
}
}
impl<P> fmt::Display for TrimPredicate<P>
where
P: Predicate<str>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.p)
}
}
/// Predicate adaper that converts a `str` predicate to byte predicate.
///
/// This is created by `pred.from_utf8()`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Utf8Predicate<P>
where
P: Predicate<str>,
{
p: P,
}
impl<P> Predicate<ffi::OsStr> for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn eval(&self, variable: &ffi::OsStr) -> bool {
variable.to_str().map(|s| self.p.eval(s)).unwrap_or(false)
}
fn find_case<'a>(
&'a self,
expected: bool,
variable: &ffi::OsStr,
) -> Option<reflection::Case<'a>> {
let var_str = variable.to_str();
match (expected, var_str) {
(_, Some(var_str)) => self.p.find_case(expected, var_str).map(|child| {
child.add_product(reflection::Product::new("var as str", var_str.to_owned()))
}),
(true, None) => None,
(false, None) => Some(
reflection::Case::new(Some(self), false)
.add_product(reflection::Product::new("error", "Invalid UTF-8 string")),
),
}
}
}
impl<P> Predicate<[u8]> for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn eval(&self, variable: &[u8]) -> bool {
str::from_utf8(variable)
.map(|s| self.p.eval(s))
.unwrap_or(false)
}
fn find_case<'a>(&'a self, expected: bool, variable: &[u8]) -> Option<reflection::Case<'a>> {
let var_str = str::from_utf8(variable);
match (expected, var_str) {
(_, Ok(var_str)) => self.p.find_case(expected, var_str).map(|child| {
child.add_product(reflection::Product::new("var as str", var_str.to_owned()))
}),
(true, Err(_)) => None,
(false, Err(err)) => Some(
reflection::Case::new(Some(self), false)
.add_product(reflection::Product::new("error", err)),
),
}
}
}
impl<P> reflection::PredicateReflection for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn children<'a>(&'a self) -> Box<dyn Iterator<Item = reflection::Child<'a>> + 'a> {
let params = vec![reflection::Child::new("predicate", &self.p)];
Box::new(params.into_iter())
}
}
impl<P> fmt::Display for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.p)
}
}
/// `Predicate` extension adapting a `str` Predicate.
pub trait PredicateStrExt
where
Self: Predicate<str>,
Self: Sized,
{
/// Returns a `TrimPredicate` that ensures the data passed to `Self` is trimmed.
///
/// # Examples
///
/// ```
/// use predicates::prelude::*;
///
/// let predicate_fn = predicate::str::is_empty().trim();
/// assert_eq!(true, predicate_fn.eval(" "));
/// assert_eq!(false, predicate_fn.eval(" Hello "));
/// ```
fn trim(self) -> TrimPredicate<Self> {
TrimPredicate { p: self }
}
/// Returns a `Utf8Predicate` that adapts `Self` to a `[u8]` `Predicate`.
///
/// # Examples
///
/// ```
/// use predicates::prelude::*;
/// use std::ffi::OsStr;
///
/// let predicate_fn = predicate::str::is_empty().not().from_utf8();
/// assert_eq!(true, predicate_fn.eval(OsStr::new("Hello")));
/// assert_eq!(false, predicate_fn.eval(OsStr::new("")));
/// let variable: &[u8] = b"";
/// assert_eq!(false, predicate_fn.eval(variable));
/// ```
fn from_utf8(self) -> Utf8Predicate<Self> {
Utf8Predicate { p: self }
}
/// Returns a `NormalizedPredicate` that ensures
/// the newlines within the data passed to `Self` is normalised.
///
/// # Examples
///
/// ```
/// use predicates::prelude::*;
///
/// let predicate_fn = predicate::eq("Hello World!\n").normalize();
/// assert_eq!(true, predicate_fn.eval("Hello World!\n"));
/// assert_eq!(true, predicate_fn.eval("Hello World!\r"));
/// assert_eq!(true, predicate_fn.eval("Hello World!\r\n"));
/// assert_eq!(false, predicate_fn.eval("Goodbye"));
/// ```
///
#[cfg(feature = "normalize-line-endings")]
fn normalize(self) -> NormalizedPredicate<Self> {
NormalizedPredicate { p: self }
}
}
impl<P> PredicateStrExt for P where P: Predicate<str> {}