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use cssparser::*;
use crate::traits::{Parse, ToCss, PropertyHandler};
use super::{Property, PropertyId};
use crate::declaration::DeclarationList;
use crate::macros::enum_property;
use crate::printer::Printer;
use crate::targets::Browsers;
use crate::compat::Feature;
use crate::error::{ParserError, PrinterError};
use crate::logical::LogicalProperties;
enum_property! {
pub enum OverflowKeyword {
Visible,
Hidden,
Clip,
Scroll,
Auto,
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct Overflow {
pub x: OverflowKeyword,
pub y: OverflowKeyword
}
impl<'i> Parse<'i> for Overflow {
fn parse<'t>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, ParserError<'i>>> {
let x = OverflowKeyword::parse(input)?;
let y = input.try_parse(OverflowKeyword::parse).unwrap_or_else(|_| x.clone());
Ok(Overflow { x, y })
}
}
impl ToCss for Overflow {
fn to_css<W>(&self, dest: &mut Printer<W>) -> Result<(), PrinterError> where W: std::fmt::Write {
self.x.to_css(dest)?;
if self.y != self.x {
dest.write_char(' ')?;
self.y.to_css(dest)?;
}
Ok(())
}
}
enum_property! {
pub enum TextOverflow {
Clip,
Ellipsis,
}
}
#[derive(Default)]
pub(crate) struct OverflowHandler {
targets: Option<Browsers>,
x: Option<OverflowKeyword>,
y: Option<OverflowKeyword>
}
impl OverflowHandler {
pub fn new(targets: Option<Browsers>) -> OverflowHandler {
OverflowHandler {
targets,
..OverflowHandler::default()
}
}
}
impl<'i> PropertyHandler<'i> for OverflowHandler {
fn handle_property(&mut self, property: &Property<'i>, dest: &mut DeclarationList<'i>, logical: &mut LogicalProperties) -> bool {
use Property::*;
match property {
OverflowX(val) => self.x = Some(*val),
OverflowY(val) => self.y = Some(*val),
Overflow(val) => {
self.x = Some(val.x);
self.y = Some(val.y);
}
Unparsed(val) if matches!(val.property_id, PropertyId::OverflowX | PropertyId::OverflowY | PropertyId::Overflow) => {
self.finalize(dest, logical);
dest.push(property.clone());
}
_ => return false
}
true
}
fn finalize(&mut self, dest: &mut DeclarationList, _: &mut LogicalProperties) {
if self.x.is_none() && self.y.is_none() {
return
}
let x = std::mem::take(&mut self.x);
let y = std::mem::take(&mut self.y);
match (x, y) {
(Some(x), Some(y)) if x == y || self.targets.is_none() || Feature::OverflowShorthand.is_compatible(self.targets.unwrap()) => {
dest.push(Property::Overflow(Overflow { x, y }))
}
_ => {
if let Some(x) = x {
dest.push(Property::OverflowX(x))
}
if let Some(y) = y {
dest.push(Property::OverflowY(y))
}
}
}
}
}