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Fix utils::prefix

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And add a few tests
This commit is contained in:
Alexandre Bury 2017-03-06 10:34:58 -08:00
parent b18ca17b73
commit 30cac851e7
1 changed files with 17 additions and 9 deletions
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26
src/utils/mod.rs
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@ -50,16 +50,12 @@ pub fn prefix<'a, I>(iter: I, available_width: usize, delimiter: &str) -> Prefix
let mut current_width = 0;
let sum = iter.take_while(|token| {
let needed_width = if current_width == 0 {
token.width()
} else {
// We also need to insert the delimiter, if not at the beginning.
token.width() + delimiter_width
};
if current_width + needed_width > available_width {
let width = token.width();
if current_width + width > available_width {
false
} else {
current_width += needed_width;
current_width += width;
current_width += delimiter_width;
true
}
})
@ -70,7 +66,7 @@ pub fn prefix<'a, I>(iter: I, available_width: usize, delimiter: &str) -> Prefix
// but only if the iterator was non empty.
let length = sum.saturating_sub(delimiter_len);
debug_assert!(current_width <= available_width);
debug_assert!(current_width <= available_width + delimiter_width);
Prefix {
length: length,
@ -98,3 +94,15 @@ pub fn suffix<'a, I>(iter: I, width: usize, delimiter: &str) -> Prefix
pub fn simple_suffix(text: &str, width: usize) -> Prefix {
suffix(text.graphemes(true), width, "")
}
#[cfg(test)]
mod tests {
use utils;
#[test]
fn test_prefix() {
assert_eq!(utils::prefix(" abra ".split(' '), 5, " ").length, 5);
assert_eq!(utils::prefix("abra a".split(' '), 5, " ").length, 4);
assert_eq!(utils::prefix("a a br".split(' '), 5, " ").length, 3);
}
}