rust/src/libcoretest/str.rs

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.

use std::str::from_str;

#[test]
fn test_bool_from_str() {
    assert_eq!(from_str::<bool>("true"), Some(true));
    assert_eq!(from_str::<bool>("false"), Some(false));
    assert_eq!(from_str::<bool>("not even a boolean"), None);
}

fn check_contains_all_substrings(s: &str) {
    assert!(s.contains(""));
    for i in range(0, s.len()) {
        for j in range(i+1, s.len() + 1) {
            assert!(s.contains(s.slice(i, j)));
        }
    }
}

#[test]
fn strslice_issue_16589() {
    assert!("bananas".contains("nana"));

    // prior to the fix for #16589, x.contains("abcdabcd") returned false
    // test all substrings for good measure
    check_contains_all_substrings("012345678901234567890123456789bcdabcdabcd");
}

#[test]
fn strslice_issue_16878() {
    assert!(!"1234567ah012345678901ah".contains("hah"));
    assert!(!"00abc01234567890123456789abc".contains("bcabc"));
}


#[test]
fn test_strslice_contains() {
    let x = "There are moments, Jeeves, when one asks oneself, 'Do trousers matter?'";
    check_contains_all_substrings(x);
}

#[test]
fn test_rsplitn_char_iterator() {
    let data = "\nMäry häd ä little lämb\nLittle lämb\n";

    let mut split: Vec<&str> = data.rsplitn(3, ' ').collect();
    split.reverse();
    assert_eq!(split, vec!["\nMäry häd ä", "little", "lämb\nLittle", "lämb\n"]);

    let mut split: Vec<&str> = data.rsplitn(3, |&: c: char| c == ' ').collect();
    split.reverse();
    assert_eq!(split, vec!["\nMäry häd ä", "little", "lämb\nLittle", "lämb\n"]);

    // Unicode
    let mut split: Vec<&str> = data.rsplitn(3, 'ä').collect();
    split.reverse();
    assert_eq!(split, vec!["\nMäry häd ", " little l", "mb\nLittle l", "mb\n"]);

    let mut split: Vec<&str> = data.rsplitn(3, |&: c: char| c == 'ä').collect();
    split.reverse();
    assert_eq!(split, vec!["\nMäry häd ", " little l", "mb\nLittle l", "mb\n"]);
}

#[test]
fn test_split_char_iterator() {
    let data = "\nMäry häd ä little lämb\nLittle lämb\n";

    let split: Vec<&str> = data.split(' ').collect();
    assert_eq!( split, vec!["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);

    let mut rsplit: Vec<&str> = data.split(' ').rev().collect();
    rsplit.reverse();
    assert_eq!(rsplit, vec!["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);

    let split: Vec<&str> = data.split(|&: c: char| c == ' ').collect();
    assert_eq!( split, vec!["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);

    let mut rsplit: Vec<&str> = data.split(|&: c: char| c == ' ').rev().collect();
    rsplit.reverse();
    assert_eq!(rsplit, vec!["\nMäry", "häd", "ä", "little", "lämb\nLittle", "lämb\n"]);

    // Unicode
    let split: Vec<&str> = data.split('ä').collect();
    assert_eq!( split, vec!["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);

    let mut rsplit: Vec<&str> = data.split('ä').rev().collect();
    rsplit.reverse();
    assert_eq!(rsplit, vec!["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);

    let split: Vec<&str> = data.split(|&: c: char| c == 'ä').collect();
    assert_eq!( split, vec!["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);

    let mut rsplit: Vec<&str> = data.split(|&: c: char| c == 'ä').rev().collect();
    rsplit.reverse();
    assert_eq!(rsplit, vec!["\nM", "ry h", "d ", " little l", "mb\nLittle l", "mb\n"]);
}

#[test]
fn test_rev_split_char_iterator_no_trailing() {
    let data = "\nMäry häd ä little lämb\nLittle lämb\n";

    let mut split: Vec<&str> = data.split('\n').rev().collect();
    split.reverse();
    assert_eq!(split, vec!["", "Märy häd ä little lämb", "Little lämb", ""]);

    let mut split: Vec<&str> = data.split_terminator('\n').rev().collect();
    split.reverse();
    assert_eq!(split, vec!["", "Märy häd ä little lämb", "Little lämb"]);
}

#[test]
fn test_utf16_code_units() {
    use unicode::str::Utf16Encoder;
    assert_eq!(Utf16Encoder::new(vec!['é', '\U0001F4A9'].into_iter()).collect::<Vec<u16>>(),
               vec![0xE9, 0xD83D, 0xDCA9])
}