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use unicode_normalization::UnicodeNormalization as _;
use unicode_width::UnicodeWidthChar as _;
/// Represents a single terminal cell.
#[derive(Clone, Debug, Default, Eq, PartialEq)]
pub struct Cell {
contents: String,
attrs: crate::attrs::Attrs,
}
impl Cell {
pub(crate) fn set(&mut self, c: String, a: crate::attrs::Attrs) {
self.contents = c;
self.attrs = a;
}
pub(crate) fn append(&mut self, c: char) {
self.contents.push(c);
// some fonts have combined characters but can't render combining
// characters correctly, so try to prefer precombined characters when
// possible
if !unicode_normalization::is_nfc(&self.contents) {
self.contents = self.contents.nfc().collect();
}
}
pub(crate) fn clear(&mut self, bgcolor: crate::attrs::Color) {
self.contents.clear();
self.attrs.clear();
self.attrs.bgcolor = bgcolor;
}
/// Returns the text contents of the cell.
///
/// Can include multiple unicode characters if combining characters are
/// used, but will contain at most one character with a non-zero character
/// width.
pub fn contents(&self) -> &str {
&self.contents
}
/// Returns whether the cell contains any text data.
pub fn has_contents(&self) -> bool {
self.contents != ""
}
/// Returns whether the text data in the cell represents a wide character.
pub fn is_wide(&self) -> bool {
// strings in this context should always be an arbitrary character
// followed by zero or more zero-width characters, so we should only
// have to look at the first character
let width = self
.contents
.chars()
.next()
.map_or(0, |c| c.width().unwrap_or(0));
width > 1
}
pub(crate) fn attrs(&self) -> &crate::attrs::Attrs {
&self.attrs
}
/// Returns the foreground color of the cell.
pub fn fgcolor(&self) -> crate::attrs::Color {
self.attrs.fgcolor
}
/// Returns the background color of the cell.
pub fn bgcolor(&self) -> crate::attrs::Color {
self.attrs.bgcolor
}
/// Returns whether the cell should be rendered with the bold text
/// attribute.
pub fn bold(&self) -> bool {
self.attrs.bold()
}
/// Returns whether the cell should be rendered with the italic text
/// attribute.
pub fn italic(&self) -> bool {
self.attrs.italic()
}
/// Returns whether the cell should be rendered with the underlined text
/// attribute.
pub fn underline(&self) -> bool {
self.attrs.underline()
}
/// Returns whether the cell should be rendered with the inverse text
/// attribute.
pub fn inverse(&self) -> bool {
self.attrs.inverse()
}
}
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