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grass/src/units.rs

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Implement lexing, basic parsing, and pretty printing
2020-01-04 22:55:04 -05:00
use std::convert::TryFrom;
use std::fmt;
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum Unit {
// Absolute units
/// Pixels
Px,
/// Millimeters
Mm,
/// Inches
In,
/// Centimeters
Cm,
/// Quarter-millimeters
Q,
/// Points
Pt,
/// Picas
Pc,
// Font relative units
/// Font size of the parent element
Em,
/// Font size of the root element
Rem,
/// Line height of the element
Lh,
Percent,
/// x-height of the element's font
Ex,
/// The advance measure (width) of the glyph "0" of the element's font
Ch,
/// Represents the "cap height" (nominal height of capital letters) of the element’s font
Cap,
/// Equal to the used advance measure of the "水" (CJK water ideograph, U+6C34) glyph found in the font used to render it
Ic,
/// Equal to the computed value of the line-height property on the root element (typically <html>), converted to an absolute length
Rlh,
// Viewport relative units
/// 1% of the viewport's width
Vw,
/// 1% of the viewport's height
Vh,
/// 1% of the viewport's smaller dimension
Vmin,
/// 1% of the viewport's larger dimension
Vmax,
/// Equal to 1% of the size of the initial containing block, in the direction of the root element’s inline axis
Vi,
/// Equal to 1% of the size of the initial containing block, in the direction of the root element’s block axis
Vb,
// Angle units
/// Represents an angle in degrees. One full circle is 360deg
Deg,
/// Represents an angle in gradians. One full circle is 400grad
Grad,
/// Represents an angle in radians. One full circle is 2π radians which approximates to 6.2832rad
Rad,
/// Represents an angle in a number of turns. One full circle is 1turn
Turn,
// Time units
/// Represents a time in seconds
S,
/// Represents a time in milliseconds
Ms,
// Frequency units
/// Represents a frequency in hertz
Hz,
/// Represents a frequency in kilohertz
Khz,
// Resolution units
/// Represents the number of dots per inch
Dpi,
/// Represents the number of dots per centimeter
Dpcm,
/// Represents the number of dots per px unit
Dppx,
/// Alias for dppx
X,
/// Represents a fraction of the available space in the grid container
Fr,
/// Unspecified unit
None,
}
impl TryFrom<&str> for Unit {
type Error = &'static str;
fn try_from(unit: &str) -> Result<Self, Self::Error> {
match unit.to_ascii_lowercase().as_bytes() {
b"px" => Ok(Unit::Px),
b"mm" => Ok(Unit::Mm),
b"in" => Ok(Unit::In),
b"cm" => Ok(Unit::Cm),
b"Q" => Ok(Unit::Q),
b"pt" => Ok(Unit::Pt),
b"pc" => Ok(Unit::Pc),
b"em" => Ok(Unit::Em),
b"rem" => Ok(Unit::Rem),
b"lh" => Ok(Unit::Lh),
b"%" => Ok(Unit::Percent),
b"ex" => Ok(Unit::Ex),
b"ch" => Ok(Unit::Ch),
b"cap" => Ok(Unit::Cap),
b"ic" => Ok(Unit::Ic),
b"rlh" => Ok(Unit::Rlh),
b"vw" => Ok(Unit::Vw),
b"vh" => Ok(Unit::Vh),
b"vmin" => Ok(Unit::Vmin),
b"vmax" => Ok(Unit::Vmax),
b"vi" => Ok(Unit::Vi),
b"vb" => Ok(Unit::Vb),
b"deg" => Ok(Unit::Deg),
b"grad" => Ok(Unit::Grad),
b"rad" => Ok(Unit::Rad),
b"turn" => Ok(Unit::Turn),
b"s" => Ok(Unit::S),
b"ms" => Ok(Unit::Ms),
b"Hz" => Ok(Unit::Hz),
b"kHz" => Ok(Unit::Khz),
b"dpi" => Ok(Unit::Dpi),
b"dpcm" => Ok(Unit::Dpcm),
MVP of mixin args
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b"dppx" => Ok(Unit::Dppx),
b"x" => Ok(Unit::X),
Implement lexing, basic parsing, and pretty printing
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b"fr" => Ok(Unit::Fr),
_ => Err("invalid unit"),
}
}
}
impl Into<String> for Unit {
fn into(self) -> String {
match self {
Unit::Px => "px",
Unit::Mm => "mm",
Unit::In => "in",
Unit::Cm => "cm",
Unit::Q => "Q",
Unit::Pt => "pt",
Unit::Pc => "pc",
Unit::Em => "em",
Unit::Rem => "rem",
Unit::Lh => "lh",
Unit::Percent => "%",
Unit::Ex => "ex",
Unit::Ch => "ch",
Unit::Cap => "cap",
Unit::Ic => "ic",
Unit::Rlh => "rlh",
Unit::Vw => "vw",
Unit::Vh => "vh",
Unit::Vmin => "vmin",
Unit::Vmax => "vmax",
Unit::Vi => "vi",
Unit::Vb => "vb",
Unit::Deg => "deg",
Unit::Grad => "grad",
Unit::Rad => "rad",
Unit::Turn => "turn",
Unit::S => "s",
Unit::Ms => "ms",
Unit::Hz => "Hz",
Unit::Khz => "kHz",
Unit::Dpi => "dpi",
Unit::Dpcm => "dpcm",
MVP of mixin args
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Unit::Dppx => "dppx",
Unit::X => "x",
Implement lexing, basic parsing, and pretty printing
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Unit::Fr => "fr",
Unit::None => "",
}
.into()
}
}
impl Into<&'static str> for Unit {
fn into(self) -> &'static str {
match self {
Unit::Px => "px",
Unit::Mm => "mm",
Unit::In => "in",
Unit::Cm => "cm",
Unit::Q => "Q",
Unit::Pt => "pt",
Unit::Pc => "pc",
Unit::Em => "em",
Unit::Rem => "rem",
Unit::Lh => "lh",
Unit::Percent => "%",
Unit::Ex => "ex",
Unit::Ch => "ch",
Unit::Cap => "cap",
Unit::Ic => "ic",
Unit::Rlh => "rlh",
Unit::Vw => "vw",
Unit::Vh => "vh",
Unit::Vmin => "vmin",
Unit::Vmax => "vmax",
Unit::Vi => "vi",
Unit::Vb => "vb",
Unit::Deg => "deg",
Unit::Grad => "grad",
Unit::Rad => "rad",
Unit::Turn => "turn",
Unit::S => "s",
Unit::Ms => "ms",
Unit::Hz => "Hz",
Unit::Khz => "kHz",
Unit::Dpi => "dpi",
Unit::Dpcm => "dpcm",
MVP of mixin args
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Unit::Dppx => "dppx",
Unit::X => "x",
Implement lexing, basic parsing, and pretty printing
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Unit::Fr => "fr",
Unit::None => "",
}
}
}
impl fmt::Display for Unit {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Unit::Px => write!(f, "px"),
Unit::Mm => write!(f, "mm"),
Unit::In => write!(f, "in"),
Unit::Cm => write!(f, "cm"),
Unit::Q => write!(f, "Q"),
Unit::Pt => write!(f, "pt"),
Unit::Pc => write!(f, "pc"),
Unit::Em => write!(f, "em"),
Unit::Rem => write!(f, "rem"),
Unit::Lh => write!(f, "lh"),
Unit::Percent => write!(f, "%"),
Unit::Ex => write!(f, "ex"),
Unit::Ch => write!(f, "ch"),
Unit::Cap => write!(f, "cap"),
Unit::Ic => write!(f, "ic"),
Unit::Rlh => write!(f, "rlh"),
Unit::Vw => write!(f, "vw"),
Unit::Vh => write!(f, "vh"),
Unit::Vmin => write!(f, "vmin"),
Unit::Vmax => write!(f, "vmax"),
Unit::Vi => write!(f, "vi"),
Unit::Vb => write!(f, "vb"),
Unit::Deg => write!(f, "deg"),
Unit::Grad => write!(f, "grad"),
Unit::Rad => write!(f, "rad"),
Unit::Turn => write!(f, "turn"),
Unit::S => write!(f, "s"),
Unit::Ms => write!(f, "ms"),
Unit::Hz => write!(f, "Hz"),
Unit::Khz => write!(f, "kHz"),
Unit::Dpi => write!(f, "dpi"),
Unit::Dpcm => write!(f, "dpcm"),
MVP of mixin args
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Unit::Dppx => write!(f, "dppx"),
Unit::X => write!(f, "x"),
Implement lexing, basic parsing, and pretty printing
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Unit::Fr => write!(f, "fr"),
Unit::None => write!(f, ""),
}
}
}
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