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docs(span): update docs and tests for Span (#427)
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@joshka
joshka authored Aug 25, 2023
1 parent 6d6ecee commit d0ee04a
Showing 1 changed file with 153 additions and 67 deletions.
220 changes: 153 additions & 67 deletions src/text/span.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,22 +6,66 @@ use unicode_width::UnicodeWidthStr;
use super::StyledGrapheme;
use crate::style::{Style, Styled};

/// A string where all graphemes have the same style.
/// Represents a part of a line that is contiguous and where all characters share the same style.
///
/// A `Span` is the smallest unit of text that can be styled. It is usually combined in the [`Line`]
/// type to represent a line of text where each `Span` may have a different style.
///
/// # Examples
///
/// A `Span` with `style` set to [`Style::default()`] can be created from a `&str`, a `String`, or
/// any type convertible to [`Cow<str>`].
///
/// ```rust
/// # use ratatui::prelude::*;
/// let span = Span::raw("test content");
/// let span = Span::raw(String::from("test content"));
/// let span = Span::from("test content");
/// let span = Span::from(String::from("test content"));
/// let span: Span = "test content".into();
/// let span: Span = String::from("test content").into();
/// ```
///
/// Styled spans can be created using [`Span::styled`] or by converting strings using methods from
/// the [`Stylize`] trait.
///
/// ```rust
/// # use ratatui::prelude::*;
/// let span = Span::styled("test content", Style::new().green());
/// let span = Span::styled(String::from("test content"), Style::new().green());
/// let span = "test content".green();
/// let span = String::from("test content").green();
/// ```
///
/// `Span` implements [`Stylize`], which allows it to be styled using the shortcut methods. Styles
/// applied are additive.
///
/// ```rust
/// # use ratatui::prelude::*;
/// let span = Span::raw("test content").green().on_yellow().italic();
/// let span = Span::raw(String::from("test content")).green().on_yellow().italic();
/// ```
///
/// [`Line`]: crate::text::Line
/// [`Stylize`]: crate::style::Stylize
/// [`Cow<str>`]: std::borrow::Cow
#[derive(Debug, Default, Clone, Eq, PartialEq, Hash)]
pub struct Span<'a> {
/// The content of the span as a Clone-on-write string.
pub content: Cow<'a, str>,
/// The style of the span.
pub style: Style,
}

impl<'a> Span<'a> {
/// Create a span with no style.
/// Create a span with the default style.
///
/// ## Examples
/// # Examples
///
/// ```rust
/// # use ratatui::text::Span;
/// Span::raw("My text");
/// Span::raw(String::from("My text"));
/// Span::raw("test content");
/// Span::raw(String::from("test content"));
/// ```
pub fn raw<T>(content: T) -> Span<'a>
where
Expand All @@ -33,16 +77,15 @@ impl<'a> Span<'a> {
}
}

/// Create a span with a style.
/// Create a span with the specified style.
///
/// # Examples
///
/// ```rust
/// # use ratatui::text::Span;
/// # use ratatui::style::{Color, Modifier, Style};
/// let style = Style::default().fg(Color::Yellow).add_modifier(Modifier::ITALIC);
/// Span::styled("My text", style);
/// Span::styled(String::from("My text"), style);
/// # use ratatui::prelude::*;
/// let style = Style::new().yellow().on_green().italic();
/// Span::styled("test content", style);
/// Span::styled(String::from("test content"), style);
/// ```
pub fn styled<T>(content: T, style: Style) -> Span<'a>
where
Expand All @@ -54,78 +97,72 @@ impl<'a> Span<'a> {
}
}

/// Returns the width of the content held by this span.
/// Returns the unicode width of the content held by this span.
pub fn width(&self) -> usize {
self.content.width()
}

/// Returns an iterator over the graphemes held by this span.
///
/// `base_style` is the [`Style`] that will be patched with each grapheme [`Style`] to get
/// the resulting [`Style`].
/// `base_style` is the [`Style`] that will be patched with the `Span`'s `style` to get the
/// resulting [`Style`].
///
/// ## Examples
/// # Example
///
/// ```rust
/// # use ratatui::text::{Span, StyledGrapheme};
/// # use ratatui::style::{Color, Modifier, Style};
/// # use ratatui::{prelude::*, text::StyledGrapheme};
/// # use std::iter::Iterator;
/// let span = Span::styled("Text", Style::default().fg(Color::Yellow));
/// let style = Style::default().fg(Color::Green).bg(Color::Black);
/// let span = Span::styled("Test", Style::new().green().italic());
/// let style = Style::new().red().on_yellow();
/// assert_eq!(
/// span.styled_graphemes(style).collect::<Vec<StyledGrapheme>>(),
/// vec![
/// StyledGrapheme::new("T", Style::default().fg(Color::Yellow).bg(Color::Black)),
/// StyledGrapheme::new("e", Style::default().fg(Color::Yellow).bg(Color::Black)),
/// StyledGrapheme::new("x", Style::default().fg(Color::Yellow).bg(Color::Black)),
/// StyledGrapheme::new("t", Style::default().fg(Color::Yellow).bg(Color::Black)),
/// StyledGrapheme::new("T", Style::new().green().on_yellow().italic()),
/// StyledGrapheme::new("e", Style::new().green().on_yellow().italic()),
/// StyledGrapheme::new("s", Style::new().green().on_yellow().italic()),
/// StyledGrapheme::new("t", Style::new().green().on_yellow().italic()),
/// ],
/// );
/// ```
pub fn styled_graphemes(
&'a self,
base_style: Style,
) -> impl Iterator<Item = StyledGrapheme<'a>> {
UnicodeSegmentation::graphemes(self.content.as_ref(), true)
self.content
.as_ref()
.graphemes(true)
.filter(|g| *g != "\n")
.map(move |g| StyledGrapheme {
symbol: g,
style: base_style.patch(self.style),
})
.filter(|s| s.symbol != "\n")
}

/// Patches the style an existing Span, adding modifiers from the given style.
/// Patches the style of the Span, adding modifiers from the given style.
///
/// ## Examples
/// # Example
///
/// ```rust
/// # use ratatui::text::Span;
/// # use ratatui::style::{Color, Style, Modifier};
/// let style = Style::default().fg(Color::Yellow).add_modifier(Modifier::ITALIC);
/// let mut raw_span = Span::raw("My text");
/// let mut styled_span = Span::styled("My text", style);
///
/// assert_ne!(raw_span, styled_span);
///
/// raw_span.patch_style(style);
/// assert_eq!(raw_span, styled_span);
/// # use ratatui::prelude::*;
/// let mut span = Span::styled("test content", Style::new().green().italic());
/// span.patch_style(Style::new().red().on_yellow().bold());
/// assert_eq!(span.style, Style::new().red().on_yellow().italic().bold());
/// ```
pub fn patch_style(&mut self, style: Style) {
self.style = self.style.patch(style);
}

/// Resets the style of the Span.
/// Equivalent to calling `patch_style(Style::reset())`.
///
/// ## Examples
/// This is Equivalent to calling `patch_style(Style::reset())`.
///
/// ```rust
/// # use ratatui::text::Span;
/// # use ratatui::style::{Color, Style, Modifier};
/// let mut span = Span::styled("My text", Style::default().fg(Color::Yellow).add_modifier(Modifier::ITALIC));
/// # Example
///
/// ```rust
/// # use ratatui::prelude::*;
/// let mut span = Span::styled("Test Content", Style::new().green().on_yellow().italic());
/// span.reset_style();
/// assert_eq!(Style::reset(), span.style);
/// assert_eq!(span.style, Style::reset());
/// ```
pub fn reset_style(&mut self) {
self.patch_style(Style::reset());
Expand All @@ -143,6 +180,7 @@ where

impl<'a> Styled for Span<'a> {
type Item = Span<'a>;

fn style(&self) -> Style {
self.style
}
Expand All @@ -156,61 +194,109 @@ impl<'a> Styled for Span<'a> {
#[cfg(test)]
mod tests {
use super::*;
use crate::style::Stylize;

#[test]
fn default() {
let span = Span::default();
assert_eq!(span.content, Cow::Borrowed(""));
assert_eq!(span.style, Style::default());
}

#[test]
fn raw_str() {
let span = Span::raw("test content");
assert_eq!(span.content, Cow::Borrowed("test content"));
assert_eq!(span.style, Style::default());
}

#[test]
fn raw_string() {
let content = String::from("test content");
let span = Span::raw(content.clone());
assert_eq!(span.content, Cow::Owned::<str>(content));
assert_eq!(span.style, Style::default());
}

#[test]
fn styled_str() {
let style = Style::new().red();
let span = Span::styled("test content", style);
assert_eq!(span.content, Cow::Borrowed("test content"));
assert_eq!(span.style, Style::new().red());
}

#[test]
fn styled_string() {
let content = String::from("test content");
let style = Style::new().green();
let span = Span::styled(content.clone(), style);
assert_eq!(span.content, Cow::Owned::<str>(content));
assert_eq!(span.style, style);
}

#[test]
fn from_ref_str_borrowed_cow() {
let content = "some string";
let content = "test content";
let span = Span::from(content);
assert_eq!(span.content, Cow::Borrowed(content));
assert_eq!(span.style, Style::default());
}

#[test]
fn from_string_ref_str_borrowed_cow() {
let content = String::from("some string");
let content = String::from("test content");
let span = Span::from(content.as_str());
assert_eq!(span.content, Cow::Borrowed(content.as_str()));
assert_eq!(span.style, Style::default());
}

#[test]
fn from_string_owned_cow() {
let content = String::from("some string");
let content_clone = content.clone();
let span = Span::from(content);
assert_eq!(span.content, Cow::Owned::<str>(content_clone));
let content = String::from("test content");
let span = Span::from(content.clone());
assert_eq!(span.content, Cow::Owned::<str>(content));
assert_eq!(span.style, Style::default());
}

#[test]
fn from_ref_string_borrowed_cow() {
let content = String::from("some string");
let content = String::from("test content");
let span = Span::from(&content);
assert_eq!(span.content, Cow::Borrowed(content.as_str()));
assert_eq!(span.style, Style::default());
}

#[test]
fn reset_should_set_style_reset() {
let mut span = Span::styled("test", Style::default().fg(crate::style::Color::Green));

assert_eq!(span.style, Style::default().fg(crate::style::Color::Green));

fn reset_style() {
let mut span = Span::styled("test content", Style::new().green());
span.reset_style();

assert_eq!(span.style, Style::reset());
assert_ne!(span.style, Style::default());
}

#[test]
fn patch_style() {
let mut span = Span::styled("test", Style::default().bg(crate::style::Color::Cyan));
let mut span = Span::styled("test content", Style::new().green().on_yellow());
span.patch_style(Style::new().red().bold());
assert_eq!(span.style, Style::new().red().on_yellow().bold());
}

assert_eq!(span.style, Style::default().bg(crate::style::Color::Cyan));
#[test]
fn width() {
assert_eq!(Span::raw("").width(), 0);
assert_eq!(Span::raw("test").width(), 4);
assert_eq!(Span::raw("test content").width(), 12);
}

span.patch_style(Style::default().fg(crate::style::Color::Green));
#[test]
fn stylize() {
let span = Span::raw("test content").green();
assert_eq!(span.content, Cow::Borrowed("test content"));
assert_eq!(span.style, Style::new().green());

assert_eq!(
span.style,
Style::default()
.bg(crate::style::Color::Cyan)
.fg(crate::style::Color::Green)
);
let span = Span::styled("test content", Style::new().green());
let stylized = span.on_yellow().bold();
assert_eq!(stylized.content, Cow::Borrowed("test content"));
assert_eq!(stylized.style, Style::new().green().on_yellow().bold());
}
}

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