2020-01-04 22:55:04 -05:00
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use std::fmt;
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2020-03-19 16:24:31 -04:00
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pub(crate) use conversion::UNIT_CONVERSION_TABLE;
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2020-03-18 10:08:40 -04:00
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2020-03-19 16:24:31 -04:00
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mod conversion;
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2020-03-18 10:08:40 -04:00
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2020-01-22 00:54:43 -05:00
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#[derive(Clone, Debug, Eq, PartialEq)]
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2020-01-20 13:15:47 -05:00
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pub(crate) 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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/// 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
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/// 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
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/// (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
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/// 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
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/// 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 6.283rad
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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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// Other units
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/// Represents a fraction of the available space in the grid container
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Fr,
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Percent,
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/// Unknown unit
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Unknown(String),
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/// Unspecified unit
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None,
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/// Units multiplied together
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Mul(Vec<Unit>),
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}
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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pub(crate) enum UnitKind {
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Absolute,
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FontRelative,
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ViewportRelative,
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Angle,
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Time,
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Frequency,
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Resolution,
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Other,
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None,
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}
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impl Unit {
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pub fn comparable(&self, other: &Unit) -> bool {
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if other == &Unit::None {
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return true;
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}
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match self.kind() {
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UnitKind::FontRelative | UnitKind::ViewportRelative | UnitKind::Other => self == other,
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UnitKind::None => true,
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u => other.kind() == u,
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}
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}
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/// Used internally to determine if two units are comparable or not
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fn kind(&self) -> UnitKind {
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match self {
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Unit::Px | Unit::Mm | Unit::In | Unit::Cm | Unit::Q | Unit::Pt | Unit::Pc => {
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UnitKind::Absolute
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}
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Unit::Em
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| Unit::Rem
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| Unit::Lh
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| Unit::Ex
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| Unit::Ch
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| Unit::Cap
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| Unit::Ic
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| Unit::Rlh => UnitKind::FontRelative,
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Unit::Vw | Unit::Vh | Unit::Vmin | Unit::Vmax | Unit::Vi | Unit::Vb => {
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UnitKind::ViewportRelative
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}
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Unit::Deg | Unit::Grad | Unit::Rad | Unit::Turn => UnitKind::Angle,
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Unit::S | Unit::Ms => UnitKind::Time,
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Unit::Hz | Unit::Khz => UnitKind::Frequency,
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Unit::Dpi | Unit::Dpcm | Unit::Dppx | Unit::X => UnitKind::Resolution,
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Unit::None => UnitKind::None,
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Unit::Fr | Unit::Percent | Unit::Unknown(..) | Unit::Mul(..) => UnitKind::Other,
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}
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}
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}
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impl From<&String> for Unit {
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fn from(unit: &String) -> Self {
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match unit.to_ascii_lowercase().as_bytes() {
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b"px" => Unit::Px,
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b"mm" => Unit::Mm,
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b"in" => Unit::In,
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b"cm" => Unit::Cm,
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b"q" => Unit::Q,
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b"pt" => Unit::Pt,
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b"pc" => Unit::Pc,
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b"em" => Unit::Em,
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b"rem" => Unit::Rem,
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b"lh" => Unit::Lh,
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b"%" => Unit::Percent,
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b"ex" => Unit::Ex,
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b"ch" => Unit::Ch,
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b"cap" => Unit::Cap,
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b"ic" => Unit::Ic,
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b"rlh" => Unit::Rlh,
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b"vw" => Unit::Vw,
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b"vh" => Unit::Vh,
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b"vmin" => Unit::Vmin,
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b"vmax" => Unit::Vmax,
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b"vi" => Unit::Vi,
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b"vb" => Unit::Vb,
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b"deg" => Unit::Deg,
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b"grad" => Unit::Grad,
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b"rad" => Unit::Rad,
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b"turn" => Unit::Turn,
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b"s" => Unit::S,
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b"ms" => Unit::Ms,
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b"hz" => Unit::Hz,
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b"khz" => Unit::Khz,
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b"dpi" => Unit::Dpi,
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b"dpcm" => Unit::Dpcm,
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b"dppx" => Unit::Dppx,
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b"x" => Unit::X,
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b"fr" => Unit::Fr,
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_ => Unit::Unknown(String::from(unit)),
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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 => write!(f, "dppx"),
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Unit::X => write!(f, "x"),
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Unit::Fr => write!(f, "fr"),
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Unit::Unknown(s) => write!(f, "{}", s),
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Unit::None => write!(f, ""),
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Unit::Mul(u) => write!(
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f,
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"{}",
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u.iter()
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.map(ToString::to_string)
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.collect::<Vec<String>>()
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.join("*")
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),
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}
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}
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}
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