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|
//! Fork of `textwrap` crate
//!
//! Benefits of forking:
//! - Pull in only what we need rather than relying on the compiler to remove what we don't need
//! - `LineWrapper` is able to incrementally wrap which will help with `StyledStr
pub(crate) mod core;
#[cfg(feature = "wrap_help")]
pub(crate) mod word_separators;
#[cfg(feature = "wrap_help")]
pub(crate) mod wrap_algorithms;
#[cfg(feature = "wrap_help")]
pub(crate) fn wrap(content: &str, hard_width: usize) -> String {
let mut wrapper = wrap_algorithms::LineWrapper::new(hard_width);
let mut total = Vec::new();
for line in content.split_inclusive('\n') {
wrapper.reset();
let line = word_separators::find_words_ascii_space(line).collect::<Vec<_>>();
total.extend(wrapper.wrap(line));
}
total.join("")
}
#[cfg(not(feature = "wrap_help"))]
pub(crate) fn wrap(content: &str, _hard_width: usize) -> String {
content.to_owned()
}
#[cfg(test)]
#[cfg(feature = "wrap_help")]
mod test {
/// Compatibility shim to keep textwrap's tests
fn wrap(content: &str, hard_width: usize) -> Vec<String> {
super::wrap(content, hard_width)
.trim_end()
.split('\n')
.map(|s| s.to_owned())
.collect::<Vec<_>>()
}
#[test]
fn no_wrap() {
assert_eq!(wrap("foo", 10), vec!["foo"]);
}
#[test]
fn wrap_simple() {
assert_eq!(wrap("foo bar baz", 5), vec!["foo", "bar", "baz"]);
}
#[test]
fn to_be_or_not() {
assert_eq!(
wrap("To be, or not to be, that is the question.", 10),
vec!["To be, or", "not to be,", "that is", "the", "question."]
);
}
#[test]
fn multiple_words_on_first_line() {
assert_eq!(wrap("foo bar baz", 10), vec!["foo bar", "baz"]);
}
#[test]
fn long_word() {
assert_eq!(wrap("foo", 0), vec!["foo"]);
}
#[test]
fn long_words() {
assert_eq!(wrap("foo bar", 0), vec!["foo", "bar"]);
}
#[test]
fn max_width() {
assert_eq!(wrap("foo bar", usize::MAX), vec!["foo bar"]);
let text = "Hello there! This is some English text. \
It should not be wrapped given the extents below.";
assert_eq!(wrap(text, usize::MAX), vec![text]);
}
#[test]
fn leading_whitespace() {
assert_eq!(wrap(" foo bar", 6), vec![" foo", " bar"]);
}
#[test]
fn leading_whitespace_empty_first_line() {
// If there is no space for the first word, the first line
// will be empty. This is because the string is split into
// words like [" ", "foobar ", "baz"], which puts "foobar " on
// the second line. We never output trailing whitespace
assert_eq!(wrap(" foobar baz", 6), vec!["", " foobar", " baz"]);
}
#[test]
fn trailing_whitespace() {
// Whitespace is only significant inside a line. After a line
// gets too long and is broken, the first word starts in
// column zero and is not indented.
assert_eq!(wrap("foo bar baz ", 5), vec!["foo", "bar", "baz"]);
}
#[test]
fn issue_99() {
// We did not reset the in_whitespace flag correctly and did
// not handle single-character words after a line break.
assert_eq!(
wrap("aaabbbccc x yyyzzzwww", 9),
vec!["aaabbbccc", "x", "yyyzzzwww"]
);
}
#[test]
fn issue_129() {
// The dash is an em-dash which takes up four bytes. We used
// to panic since we tried to index into the character.
assert_eq!(wrap("x – x", 1), vec!["x", "–", "x"]);
}
}
|
