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Diffstat (limited to 'vendor/nu-ansi-term/src/difference.rs')
| -rw-r--r-- | vendor/nu-ansi-term/src/difference.rs | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/vendor/nu-ansi-term/src/difference.rs b/vendor/nu-ansi-term/src/difference.rs deleted file mode 100644 index beee8ea25..000000000 --- a/vendor/nu-ansi-term/src/difference.rs +++ /dev/null @@ -1,174 +0,0 @@ -use super::Style; - -/// When printing out one colored string followed by another, use one of -/// these rules to figure out which *extra* control codes need to be sent. -#[derive(PartialEq, Clone, Copy, Debug)] -pub enum Difference { - /// Print out the control codes specified by this style to end up looking - /// like the second string's styles. - ExtraStyles(Style), - - /// Converting between these two is impossible, so just send a reset - /// command and then the second string's styles. - Reset, - - /// The before style is exactly the same as the after style, so no further - /// control codes need to be printed. - Empty, -} - -impl Difference { - /// Compute the 'style difference' required to turn an existing style into - /// the given, second style. - /// - /// For example, to turn green text into green bold text, it's redundant - /// to write a reset command then a second green+bold command, instead of - /// just writing one bold command. This method should see that both styles - /// use the foreground color green, and reduce it to a single command. - /// - /// This method returns an enum value because it's not actually always - /// possible to turn one style into another: for example, text could be - /// made bold and underlined, but you can't remove the bold property - /// without also removing the underline property. So when this has to - /// happen, this function returns None, meaning that the entire set of - /// styles should be reset and begun again. - pub fn between(first: &Style, next: &Style) -> Difference { - use self::Difference::*; - - // XXX(Havvy): This algorithm is kind of hard to replicate without - // having the Plain/Foreground enum variants, so I'm just leaving - // it commented out for now, and defaulting to Reset. - - if first == next { - return Empty; - } - - // Cannot un-bold, so must Reset. - if first.is_bold && !next.is_bold { - return Reset; - } - - if first.is_dimmed && !next.is_dimmed { - return Reset; - } - - if first.is_italic && !next.is_italic { - return Reset; - } - - // Cannot un-underline, so must Reset. - if first.is_underline && !next.is_underline { - return Reset; - } - - if first.is_blink && !next.is_blink { - return Reset; - } - - if first.is_reverse && !next.is_reverse { - return Reset; - } - - if first.is_hidden && !next.is_hidden { - return Reset; - } - - if first.is_strikethrough && !next.is_strikethrough { - return Reset; - } - - // Cannot go from foreground to no foreground, so must Reset. - if first.foreground.is_some() && next.foreground.is_none() { - return Reset; - } - - // Cannot go from background to no background, so must Reset. - if first.background.is_some() && next.background.is_none() { - return Reset; - } - - let mut extra_styles = Style::default(); - - if first.is_bold != next.is_bold { - extra_styles.is_bold = true; - } - - if first.is_dimmed != next.is_dimmed { - extra_styles.is_dimmed = true; - } - - if first.is_italic != next.is_italic { - extra_styles.is_italic = true; - } - - if first.is_underline != next.is_underline { - extra_styles.is_underline = true; - } - - if first.is_blink != next.is_blink { - extra_styles.is_blink = true; - } - - if first.is_reverse != next.is_reverse { - extra_styles.is_reverse = true; - } - - if first.is_hidden != next.is_hidden { - extra_styles.is_hidden = true; - } - - if first.is_strikethrough != next.is_strikethrough { - extra_styles.is_strikethrough = true; - } - - if first.foreground != next.foreground { - extra_styles.foreground = next.foreground; - } - - if first.background != next.background { - extra_styles.background = next.background; - } - - ExtraStyles(extra_styles) - } -} - -#[cfg(test)] -mod test { - use super::Difference::*; - use super::*; - use crate::style::Color::*; - use crate::style::Style; - - fn style() -> Style { - Style::new() - } - - macro_rules! test { - ($name: ident: $first: expr; $next: expr => $result: expr) => { - #[test] - fn $name() { - assert_eq!($result, Difference::between(&$first, &$next)); - } - }; - } - - test!(nothing: Green.normal(); Green.normal() => Empty); - test!(uppercase: Green.normal(); Green.bold() => ExtraStyles(style().bold())); - test!(lowercase: Green.bold(); Green.normal() => Reset); - test!(nothing2: Green.bold(); Green.bold() => Empty); - - test!(color_change: Red.normal(); Blue.normal() => ExtraStyles(Blue.normal())); - - test!(addition_of_blink: style(); style().blink() => ExtraStyles(style().blink())); - test!(addition_of_dimmed: style(); style().dimmed() => ExtraStyles(style().dimmed())); - test!(addition_of_hidden: style(); style().hidden() => ExtraStyles(style().hidden())); - test!(addition_of_reverse: style(); style().reverse() => ExtraStyles(style().reverse())); - test!(addition_of_strikethrough: style(); style().strikethrough() => ExtraStyles(style().strikethrough())); - - test!(removal_of_strikethrough: style().strikethrough(); style() => Reset); - test!(removal_of_reverse: style().reverse(); style() => Reset); - test!(removal_of_hidden: style().hidden(); style() => Reset); - test!(removal_of_dimmed: style().dimmed(); style() => Reset); - test!(removal_of_blink: style().blink(); style() => Reset); -} |