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use crate::error::{ParserError, PrinterError};
use crate::printer::Printer;
use crate::traits::{Parse, ToCss};
use crate::values::number::{CSSInteger, CSSNumber};
use cssparser::*;
use std::fmt::Write;
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(
feature = "serde",
derive(serde::Serialize, serde::Deserialize),
serde(tag = "type", content = "value", rename_all = "kebab-case")
)]
pub enum EasingFunction {
Linear,
Ease,
EaseIn,
EaseOut,
EaseInOut,
CubicBezier(CSSNumber, CSSNumber, CSSNumber, CSSNumber),
Steps(CSSInteger, StepPosition),
}
impl<'i> Parse<'i> for EasingFunction {
fn parse<'t>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, ParserError<'i>>> {
let location = input.current_source_location();
if let Ok(ident) = input.try_parse(|i| i.expect_ident_cloned()) {
let keyword = match_ignore_ascii_case! { &ident,
"linear" => EasingFunction::Linear,
"ease" => EasingFunction::Ease,
"ease-in" => EasingFunction::EaseIn,
"ease-out" => EasingFunction::EaseOut,
"ease-in-out" => EasingFunction::EaseInOut,
"step-start" => EasingFunction::Steps(1, StepPosition::Start),
"step-end" => EasingFunction::Steps(1, StepPosition::End),
_ => return Err(location.new_unexpected_token_error(Token::Ident(ident.clone())))
};
return Ok(keyword);
}
let function = input.expect_function()?.clone();
input.parse_nested_block(|input| {
match_ignore_ascii_case! { &function,
"cubic-bezier" => {
let x1 = CSSNumber::parse(input)?;
input.expect_comma()?;
let y1 = CSSNumber::parse(input)?;
input.expect_comma()?;
let x2 = CSSNumber::parse(input)?;
input.expect_comma()?;
let y2 = CSSNumber::parse(input)?;
Ok(EasingFunction::CubicBezier(x1, y1, x2, y2))
},
"steps" => {
let steps = CSSInteger::parse(input)?;
let position = input.try_parse(|input| {
input.expect_comma()?;
StepPosition::parse(input)
}).unwrap_or(StepPosition::End);
Ok(EasingFunction::Steps(steps, position))
},
_ => return Err(location.new_unexpected_token_error(Token::Ident(function.clone())))
}
})
}
}
impl ToCss for EasingFunction {
fn to_css<W>(&self, dest: &mut Printer<W>) -> Result<(), PrinterError>
where
W: std::fmt::Write,
{
match self {
EasingFunction::Linear => dest.write_str("linear"),
EasingFunction::Ease => dest.write_str("ease"),
EasingFunction::EaseIn => dest.write_str("ease-in"),
EasingFunction::EaseOut => dest.write_str("ease-out"),
EasingFunction::EaseInOut => dest.write_str("ease-in-out"),
x if *x == EasingFunction::CubicBezier(0.25, 0.1, 0.25, 1.0) => dest.write_str("ease"),
x if *x == EasingFunction::CubicBezier(0.42, 0.0, 1.0, 1.0) => dest.write_str("ease-in"),
x if *x == EasingFunction::CubicBezier(0.0, 0.0, 0.58, 1.0) => dest.write_str("ease-out"),
x if *x == EasingFunction::CubicBezier(0.42, 0.0, 0.58, 1.0) => dest.write_str("ease-in-out"),
EasingFunction::CubicBezier(x1, y1, x2, y2) => {
dest.write_str("cubic-bezier(")?;
x1.to_css(dest)?;
dest.delim(',', false)?;
y1.to_css(dest)?;
dest.delim(',', false)?;
x2.to_css(dest)?;
dest.delim(',', false)?;
y2.to_css(dest)?;
dest.write_char(')')
}
EasingFunction::Steps(1, StepPosition::Start) => dest.write_str("step-start"),
EasingFunction::Steps(1, StepPosition::End) => dest.write_str("step-end"),
EasingFunction::Steps(steps, position) => {
dest.write_str("steps(")?;
write!(dest, "{}", steps)?;
dest.delim(',', false)?;
position.to_css(dest)?;
dest.write_char(')')
}
}
}
}
impl EasingFunction {
pub fn is_ident(s: &str) -> bool {
match s {
"linear" | "ease" | "ease-in" | "ease-out" | "ease-in-out" | "step-start" | "step-end" => true,
_ => false,
}
}
}
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(
feature = "serde",
derive(serde::Serialize, serde::Deserialize),
serde(tag = "type", content = "value", rename_all = "kebab-case")
)]
pub enum StepPosition {
Start,
End,
JumpNone,
JumpBoth,
}
impl<'i> Parse<'i> for StepPosition {
fn parse<'t>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, ParserError<'i>>> {
let location = input.current_source_location();
let ident = input.expect_ident()?;
let keyword = match_ignore_ascii_case! { &ident,
"start" => StepPosition::Start,
"end" => StepPosition::End,
"jump-start" => StepPosition::Start,
"jump-end" => StepPosition::End,
"jump-none" => StepPosition::JumpNone,
"jump-both" => StepPosition::JumpBoth,
_ => return Err(location.new_unexpected_token_error(Token::Ident(ident.clone())))
};
Ok(keyword)
}
}
impl ToCss for StepPosition {
fn to_css<W>(&self, dest: &mut Printer<W>) -> Result<(), PrinterError>
where
W: std::fmt::Write,
{
match self {
StepPosition::Start => dest.write_str("start"),
StepPosition::End => dest.write_str("end"),
StepPosition::JumpNone => dest.write_str("jump-none"),
StepPosition::JumpBoth => dest.write_str("jump-both"),
}
}
}