375 lines
14 KiB
Rust
375 lines
14 KiB
Rust
use style::{Colour, Style};
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use std::fmt;
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use write::AnyWrite;
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// ---- generating ANSI codes ----
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impl Style {
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/// Write any bytes that go *before* a piece of text to the given writer.
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fn write_prefix<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
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// If there are actually no styles here, then don’t write *any* codes
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// as the prefix. An empty ANSI code may not affect the terminal
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// output at all, but a user may just want a code-free string.
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if self.is_plain() {
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return Ok(());
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}
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// Write the codes’ prefix, then write numbers, separated by
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// semicolons, for each text style we want to apply.
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write!(f, "\x1B[")?;
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let mut written_anything = false;
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{
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let mut write_char = |c| {
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if written_anything { write!(f, ";")?; }
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written_anything = true;
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write!(f, "{}", c)?;
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Ok(())
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};
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if self.is_bold { write_char('1')? }
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if self.is_dimmed { write_char('2')? }
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if self.is_italic { write_char('3')? }
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if self.is_underline { write_char('4')? }
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if self.is_blink { write_char('5')? }
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if self.is_reverse { write_char('7')? }
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if self.is_hidden { write_char('8')? }
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if self.is_strikethrough { write_char('9')? }
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}
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// The foreground and background colours, if specified, need to be
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// handled specially because the number codes are more complicated.
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// (see `write_background_code` and `write_foreground_code`)
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if let Some(bg) = self.background {
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if written_anything { write!(f, ";")?; }
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written_anything = true;
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bg.write_background_code(f)?;
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}
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if let Some(fg) = self.foreground {
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if written_anything { write!(f, ";")?; }
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fg.write_foreground_code(f)?;
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}
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// All the codes end with an `m`, because reasons.
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write!(f, "m")?;
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Ok(())
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}
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/// Write any bytes that go *after* a piece of text to the given writer.
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fn write_suffix<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
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if self.is_plain() {
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Ok(())
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}
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else {
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write!(f, "{}", RESET)
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}
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}
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}
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/// The code to send to reset all styles and return to `Style::default()`.
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pub static RESET: &str = "\x1B[0m";
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impl Colour {
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fn write_foreground_code<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
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match *self {
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Colour::Black => write!(f, "30"),
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Colour::Red => write!(f, "31"),
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Colour::Green => write!(f, "32"),
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Colour::Yellow => write!(f, "33"),
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Colour::Blue => write!(f, "34"),
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Colour::Purple => write!(f, "35"),
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Colour::Cyan => write!(f, "36"),
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Colour::White => write!(f, "37"),
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Colour::Fixed(num) => write!(f, "38;5;{}", &num),
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Colour::RGB(r,g,b) => write!(f, "38;2;{};{};{}", &r, &g, &b),
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}
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}
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fn write_background_code<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
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match *self {
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Colour::Black => write!(f, "40"),
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Colour::Red => write!(f, "41"),
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Colour::Green => write!(f, "42"),
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Colour::Yellow => write!(f, "43"),
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Colour::Blue => write!(f, "44"),
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Colour::Purple => write!(f, "45"),
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Colour::Cyan => write!(f, "46"),
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Colour::White => write!(f, "47"),
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Colour::Fixed(num) => write!(f, "48;5;{}", &num),
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Colour::RGB(r,g,b) => write!(f, "48;2;{};{};{}", &r, &g, &b),
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}
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}
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}
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/// Like `ANSIString`, but only displays the style prefix.
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///
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/// This type implements the `Display` trait, meaning it can be written to a
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/// `std::fmt` formatting without doing any extra allocation, and written to a
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/// string with the `.to_string()` method. For examples, see
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/// [`Style::prefix`](struct.Style.html#method.prefix).
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#[derive(Clone, Copy, Debug)]
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pub struct Prefix(Style);
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/// Like `ANSIString`, but only displays the difference between two
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/// styles.
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///
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/// This type implements the `Display` trait, meaning it can be written to a
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/// `std::fmt` formatting without doing any extra allocation, and written to a
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/// string with the `.to_string()` method. For examples, see
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/// [`Style::infix`](struct.Style.html#method.infix).
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#[derive(Clone, Copy, Debug)]
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pub struct Infix(Style, Style);
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/// Like `ANSIString`, but only displays the style suffix.
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///
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/// This type implements the `Display` trait, meaning it can be written to a
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/// `std::fmt` formatting without doing any extra allocation, and written to a
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/// string with the `.to_string()` method. For examples, see
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/// [`Style::suffix`](struct.Style.html#method.suffix).
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#[derive(Clone, Copy, Debug)]
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pub struct Suffix(Style);
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impl Style {
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/// The prefix bytes for this style. These are the bytes that tell the
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/// terminal to use a different colour or font style.
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///
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/// # Examples
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///
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/// ```
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/// use ansi_term::{Style, Colour::Blue};
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///
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/// let style = Style::default().bold();
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/// assert_eq!("\x1b[1m",
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/// style.prefix().to_string());
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///
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/// let style = Blue.bold();
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/// assert_eq!("\x1b[1;34m",
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/// style.prefix().to_string());
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///
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/// let style = Style::default();
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/// assert_eq!("",
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/// style.prefix().to_string());
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/// ```
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pub fn prefix(self) -> Prefix {
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Prefix(self)
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}
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/// The infix bytes between this style and `next` style. These are the bytes
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/// that tell the terminal to change the style to `next`. These may include
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/// a reset followed by the next colour and style, depending on the two styles.
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///
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/// # Examples
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///
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/// ```
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/// use ansi_term::{Style, Colour::Green};
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///
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/// let style = Style::default().bold();
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/// assert_eq!("\x1b[32m",
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/// style.infix(Green.bold()).to_string());
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///
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/// let style = Green.normal();
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/// assert_eq!("\x1b[1m",
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/// style.infix(Green.bold()).to_string());
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///
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/// let style = Style::default();
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/// assert_eq!("",
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/// style.infix(style).to_string());
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/// ```
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pub fn infix(self, next: Style) -> Infix {
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Infix(self, next)
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}
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/// The suffix for this style. These are the bytes that tell the terminal
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/// to reset back to its normal colour and font style.
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///
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/// # Examples
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///
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/// ```
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/// use ansi_term::{Style, Colour::Green};
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///
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/// let style = Style::default().bold();
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/// assert_eq!("\x1b[0m",
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/// style.suffix().to_string());
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///
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/// let style = Green.normal().bold();
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/// assert_eq!("\x1b[0m",
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/// style.suffix().to_string());
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///
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/// let style = Style::default();
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/// assert_eq!("",
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/// style.suffix().to_string());
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/// ```
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pub fn suffix(self) -> Suffix {
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Suffix(self)
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}
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}
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impl Colour {
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/// The prefix bytes for this colour as a `Style`. These are the bytes
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/// that tell the terminal to use a different colour or font style.
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///
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/// See also [`Style::prefix`](struct.Style.html#method.prefix).
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///
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/// # Examples
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///
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/// ```
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/// use ansi_term::Colour::Green;
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///
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/// assert_eq!("\x1b[0m",
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/// Green.suffix().to_string());
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/// ```
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pub fn prefix(self) -> Prefix {
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Prefix(self.normal())
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}
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/// The infix bytes between this colour and `next` colour. These are the bytes
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/// that tell the terminal to use the `next` colour, or to do nothing if
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/// the two colours are equal.
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///
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/// See also [`Style::infix`](struct.Style.html#method.infix).
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///
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/// # Examples
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///
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/// ```
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/// use ansi_term::Colour::{Red, Yellow};
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///
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/// assert_eq!("\x1b[33m",
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/// Red.infix(Yellow).to_string());
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/// ```
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pub fn infix(self, next: Colour) -> Infix {
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Infix(self.normal(), next.normal())
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}
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/// The suffix for this colour as a `Style`. These are the bytes that
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/// tell the terminal to reset back to its normal colour and font style.
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///
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/// See also [`Style::suffix`](struct.Style.html#method.suffix).
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///
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/// # Examples
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///
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/// ```
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/// use ansi_term::Colour::Purple;
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///
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/// assert_eq!("\x1b[0m",
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/// Purple.suffix().to_string());
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/// ```
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pub fn suffix(self) -> Suffix {
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Suffix(self.normal())
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}
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}
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impl fmt::Display for Prefix {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let f: &mut fmt::Write = f;
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self.0.write_prefix(f)
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}
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}
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impl fmt::Display for Infix {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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use difference::Difference;
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match Difference::between(&self.0, &self.1) {
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Difference::ExtraStyles(style) => {
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let f: &mut fmt::Write = f;
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style.write_prefix(f)
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},
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Difference::Reset => {
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let f: &mut fmt::Write = f;
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write!(f, "{}{}", RESET, self.1.prefix())
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},
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Difference::NoDifference => {
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Ok(()) // nothing to write
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},
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}
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}
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}
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impl fmt::Display for Suffix {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let f: &mut fmt::Write = f;
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self.0.write_suffix(f)
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}
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}
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#[cfg(test)]
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mod test {
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use style::Style;
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use style::Colour::*;
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macro_rules! test {
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($name: ident: $style: expr; $input: expr => $result: expr) => {
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#[test]
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fn $name() {
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assert_eq!($style.paint($input).to_string(), $result.to_string());
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let mut v = Vec::new();
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$style.paint($input.as_bytes()).write_to(&mut v).unwrap();
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assert_eq!(v.as_slice(), $result.as_bytes());
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}
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};
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}
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test!(plain: Style::default(); "text/plain" => "text/plain");
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test!(red: Red; "hi" => "\x1B[31mhi\x1B[0m");
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test!(black: Black.normal(); "hi" => "\x1B[30mhi\x1B[0m");
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test!(yellow_bold: Yellow.bold(); "hi" => "\x1B[1;33mhi\x1B[0m");
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test!(yellow_bold_2: Yellow.normal().bold(); "hi" => "\x1B[1;33mhi\x1B[0m");
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test!(blue_underline: Blue.underline(); "hi" => "\x1B[4;34mhi\x1B[0m");
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test!(green_bold_ul: Green.bold().underline(); "hi" => "\x1B[1;4;32mhi\x1B[0m");
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test!(green_bold_ul_2: Green.underline().bold(); "hi" => "\x1B[1;4;32mhi\x1B[0m");
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test!(purple_on_white: Purple.on(White); "hi" => "\x1B[47;35mhi\x1B[0m");
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test!(purple_on_white_2: Purple.normal().on(White); "hi" => "\x1B[47;35mhi\x1B[0m");
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test!(yellow_on_blue: Style::new().on(Blue).fg(Yellow); "hi" => "\x1B[44;33mhi\x1B[0m");
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test!(yellow_on_blue_2: Cyan.on(Blue).fg(Yellow); "hi" => "\x1B[44;33mhi\x1B[0m");
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test!(cyan_bold_on_white: Cyan.bold().on(White); "hi" => "\x1B[1;47;36mhi\x1B[0m");
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test!(cyan_ul_on_white: Cyan.underline().on(White); "hi" => "\x1B[4;47;36mhi\x1B[0m");
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test!(cyan_bold_ul_on_white: Cyan.bold().underline().on(White); "hi" => "\x1B[1;4;47;36mhi\x1B[0m");
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test!(cyan_ul_bold_on_white: Cyan.underline().bold().on(White); "hi" => "\x1B[1;4;47;36mhi\x1B[0m");
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test!(fixed: Fixed(100); "hi" => "\x1B[38;5;100mhi\x1B[0m");
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test!(fixed_on_purple: Fixed(100).on(Purple); "hi" => "\x1B[45;38;5;100mhi\x1B[0m");
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test!(fixed_on_fixed: Fixed(100).on(Fixed(200)); "hi" => "\x1B[48;5;200;38;5;100mhi\x1B[0m");
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test!(rgb: RGB(70,130,180); "hi" => "\x1B[38;2;70;130;180mhi\x1B[0m");
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test!(rgb_on_blue: RGB(70,130,180).on(Blue); "hi" => "\x1B[44;38;2;70;130;180mhi\x1B[0m");
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test!(blue_on_rgb: Blue.on(RGB(70,130,180)); "hi" => "\x1B[48;2;70;130;180;34mhi\x1B[0m");
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test!(rgb_on_rgb: RGB(70,130,180).on(RGB(5,10,15)); "hi" => "\x1B[48;2;5;10;15;38;2;70;130;180mhi\x1B[0m");
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test!(bold: Style::new().bold(); "hi" => "\x1B[1mhi\x1B[0m");
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test!(underline: Style::new().underline(); "hi" => "\x1B[4mhi\x1B[0m");
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test!(bunderline: Style::new().bold().underline(); "hi" => "\x1B[1;4mhi\x1B[0m");
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test!(dimmed: Style::new().dimmed(); "hi" => "\x1B[2mhi\x1B[0m");
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test!(italic: Style::new().italic(); "hi" => "\x1B[3mhi\x1B[0m");
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test!(blink: Style::new().blink(); "hi" => "\x1B[5mhi\x1B[0m");
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test!(reverse: Style::new().reverse(); "hi" => "\x1B[7mhi\x1B[0m");
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test!(hidden: Style::new().hidden(); "hi" => "\x1B[8mhi\x1B[0m");
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test!(stricken: Style::new().strikethrough(); "hi" => "\x1B[9mhi\x1B[0m");
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#[test]
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fn test_infix() {
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assert_eq!(Style::new().dimmed().infix(Style::new()).to_string(), "\x1B[0m");
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assert_eq!(White.dimmed().infix(White.normal()).to_string(), "\x1B[0m\x1B[37m");
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assert_eq!(White.normal().infix(White.bold()).to_string(), "\x1B[1m");
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assert_eq!(White.normal().infix(Blue.normal()).to_string(), "\x1B[34m");
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assert_eq!(Blue.bold().infix(Blue.bold()).to_string(), "");
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}
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}
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