262 lines
7.8 KiB
Rust
262 lines
7.8 KiB
Rust
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use std::convert::TryFrom;
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use std::fmt;
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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pub enum Unit {
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// Absolute units
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/// Pixels
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Px,
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/// Millimeters
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Mm,
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/// Inches
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In,
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/// Centimeters
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Cm,
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/// Quarter-millimeters
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Q,
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/// Points
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Pt,
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/// Picas
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Pc,
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// Font relative units
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/// Font size of the parent element
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Em,
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/// Font size of the root element
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Rem,
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/// Line height of the element
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Lh,
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Percent,
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/// x-height of the element's font
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Ex,
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/// The advance measure (width) of the glyph "0" of the element's font
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Ch,
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/// Represents the "cap height" (nominal height of capital letters) of the element’s font
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Cap,
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/// Equal to the used advance measure of the "水" (CJK water ideograph, U+6C34) glyph found in the font used to render it
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Ic,
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/// Equal to the computed value of the line-height property on the root element (typically <html>), converted to an absolute length
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Rlh,
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// Viewport relative units
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/// 1% of the viewport's width
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Vw,
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/// 1% of the viewport's height
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Vh,
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/// 1% of the viewport's smaller dimension
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Vmin,
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/// 1% of the viewport's larger dimension
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Vmax,
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/// Equal to 1% of the size of the initial containing block, in the direction of the root element’s inline axis
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Vi,
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/// Equal to 1% of the size of the initial containing block, in the direction of the root element’s block axis
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Vb,
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// Angle units
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/// Represents an angle in degrees. One full circle is 360deg
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Deg,
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/// Represents an angle in gradians. One full circle is 400grad
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Grad,
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/// Represents an angle in radians. One full circle is 2π radians which approximates to 6.2832rad
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Rad,
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/// Represents an angle in a number of turns. One full circle is 1turn
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Turn,
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// Time units
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/// Represents a time in seconds
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S,
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/// Represents a time in milliseconds
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Ms,
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// Frequency units
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/// Represents a frequency in hertz
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Hz,
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/// Represents a frequency in kilohertz
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Khz,
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// Resolution units
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/// Represents the number of dots per inch
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Dpi,
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/// Represents the number of dots per centimeter
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Dpcm,
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/// Represents the number of dots per px unit
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Dppx,
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/// Alias for dppx
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X,
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/// Represents a fraction of the available space in the grid container
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Fr,
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/// Unspecified unit
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None,
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}
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impl TryFrom<&str> for Unit {
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type Error = &'static str;
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fn try_from(unit: &str) -> Result<Self, Self::Error> {
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match unit.to_ascii_lowercase().as_bytes() {
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b"px" => Ok(Unit::Px),
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b"mm" => Ok(Unit::Mm),
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b"in" => Ok(Unit::In),
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b"cm" => Ok(Unit::Cm),
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b"Q" => Ok(Unit::Q),
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b"pt" => Ok(Unit::Pt),
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b"pc" => Ok(Unit::Pc),
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b"em" => Ok(Unit::Em),
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b"rem" => Ok(Unit::Rem),
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b"lh" => Ok(Unit::Lh),
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b"%" => Ok(Unit::Percent),
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b"ex" => Ok(Unit::Ex),
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b"ch" => Ok(Unit::Ch),
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b"cap" => Ok(Unit::Cap),
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b"ic" => Ok(Unit::Ic),
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b"rlh" => Ok(Unit::Rlh),
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b"vw" => Ok(Unit::Vw),
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b"vh" => Ok(Unit::Vh),
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b"vmin" => Ok(Unit::Vmin),
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b"vmax" => Ok(Unit::Vmax),
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b"vi" => Ok(Unit::Vi),
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b"vb" => Ok(Unit::Vb),
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b"deg" => Ok(Unit::Deg),
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b"grad" => Ok(Unit::Grad),
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b"rad" => Ok(Unit::Rad),
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b"turn" => Ok(Unit::Turn),
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b"s" => Ok(Unit::S),
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b"ms" => Ok(Unit::Ms),
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b"Hz" => Ok(Unit::Hz),
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b"kHz" => Ok(Unit::Khz),
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b"dpi" => Ok(Unit::Dpi),
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b"dpcm" => Ok(Unit::Dpcm),
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b"dppx" | b"x" => Ok(Unit::Dppx),
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b"fr" => Ok(Unit::Fr),
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_ => Err("invalid unit"),
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}
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}
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}
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impl Into<String> for Unit {
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fn into(self) -> String {
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match self {
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Unit::Px => "px",
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Unit::Mm => "mm",
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Unit::In => "in",
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Unit::Cm => "cm",
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Unit::Q => "Q",
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Unit::Pt => "pt",
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Unit::Pc => "pc",
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Unit::Em => "em",
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Unit::Rem => "rem",
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Unit::Lh => "lh",
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Unit::Percent => "%",
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Unit::Ex => "ex",
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Unit::Ch => "ch",
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Unit::Cap => "cap",
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Unit::Ic => "ic",
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Unit::Rlh => "rlh",
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Unit::Vw => "vw",
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Unit::Vh => "vh",
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Unit::Vmin => "vmin",
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Unit::Vmax => "vmax",
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Unit::Vi => "vi",
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Unit::Vb => "vb",
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Unit::Deg => "deg",
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Unit::Grad => "grad",
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Unit::Rad => "rad",
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Unit::Turn => "turn",
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Unit::S => "s",
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Unit::Ms => "ms",
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Unit::Hz => "Hz",
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Unit::Khz => "kHz",
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Unit::Dpi => "dpi",
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Unit::Dpcm => "dpcm",
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Unit::Dppx | Unit::X => "dppx",
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Unit::Fr => "fr",
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Unit::None => "",
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}
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.into()
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}
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}
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impl Into<&'static str> for Unit {
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fn into(self) -> &'static str {
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match self {
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Unit::Px => "px",
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Unit::Mm => "mm",
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Unit::In => "in",
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Unit::Cm => "cm",
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Unit::Q => "Q",
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Unit::Pt => "pt",
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Unit::Pc => "pc",
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Unit::Em => "em",
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Unit::Rem => "rem",
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Unit::Lh => "lh",
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Unit::Percent => "%",
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Unit::Ex => "ex",
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Unit::Ch => "ch",
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Unit::Cap => "cap",
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Unit::Ic => "ic",
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Unit::Rlh => "rlh",
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Unit::Vw => "vw",
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Unit::Vh => "vh",
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Unit::Vmin => "vmin",
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Unit::Vmax => "vmax",
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Unit::Vi => "vi",
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Unit::Vb => "vb",
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Unit::Deg => "deg",
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Unit::Grad => "grad",
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Unit::Rad => "rad",
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Unit::Turn => "turn",
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Unit::S => "s",
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Unit::Ms => "ms",
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Unit::Hz => "Hz",
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Unit::Khz => "kHz",
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Unit::Dpi => "dpi",
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Unit::Dpcm => "dpcm",
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Unit::Dppx | Unit::X => "dppx",
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Unit::Fr => "fr",
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Unit::None => "",
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}
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}
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}
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impl fmt::Display for Unit {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Unit::Px => write!(f, "px"),
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Unit::Mm => write!(f, "mm"),
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Unit::In => write!(f, "in"),
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Unit::Cm => write!(f, "cm"),
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Unit::Q => write!(f, "Q"),
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Unit::Pt => write!(f, "pt"),
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Unit::Pc => write!(f, "pc"),
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Unit::Em => write!(f, "em"),
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Unit::Rem => write!(f, "rem"),
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Unit::Lh => write!(f, "lh"),
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Unit::Percent => write!(f, "%"),
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Unit::Ex => write!(f, "ex"),
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Unit::Ch => write!(f, "ch"),
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Unit::Cap => write!(f, "cap"),
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Unit::Ic => write!(f, "ic"),
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Unit::Rlh => write!(f, "rlh"),
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Unit::Vw => write!(f, "vw"),
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Unit::Vh => write!(f, "vh"),
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Unit::Vmin => write!(f, "vmin"),
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Unit::Vmax => write!(f, "vmax"),
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Unit::Vi => write!(f, "vi"),
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Unit::Vb => write!(f, "vb"),
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Unit::Deg => write!(f, "deg"),
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Unit::Grad => write!(f, "grad"),
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Unit::Rad => write!(f, "rad"),
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Unit::Turn => write!(f, "turn"),
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Unit::S => write!(f, "s"),
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Unit::Ms => write!(f, "ms"),
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Unit::Hz => write!(f, "Hz"),
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Unit::Khz => write!(f, "kHz"),
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Unit::Dpi => write!(f, "dpi"),
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Unit::Dpcm => write!(f, "dpcm"),
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Unit::Dppx | Unit::X => write!(f, "dppx"),
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Unit::Fr => write!(f, "fr"),
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Unit::None => write!(f, ""),
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}
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}
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}
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