Parse custom idents

Author: devongovett

src/lib.rs

@@ -1288,5 +1288,9 @@ mod tests {
     minify_test(".foo { transition-duration: calc((1s - 50ms) * 2) }", ".foo{transition-duration:1.9s}");
     minify_test(".foo { transition-duration: calc(2 * (1s - 50ms)) }", ".foo{transition-duration:1.9s}");
     minify_test(".foo { transition-duration: calc((2s + 50ms) - (1s - 50ms)) }", ".foo{transition-duration:1.1s}");
+    minify_test(".foo { transition-duration: 500ms, 50ms }", ".foo{transition-duration:.5s,50ms}");
+    minify_test(".foo { transition-delay: 500ms }", ".foo{transition-delay:.5s}");
+    minify_test(".foo { transition-property: background }", ".foo{transition-property:background}");
+    minify_test(".foo { transition-property: background, opacity }", ".foo{transition-property:background,opacity}");
   }
 }

src/properties/mod.rs

@@ -21,7 +21,7 @@ use box_shadow::*;
 use border::*;
 use border_image::*;
 use border_radius::*;
-use crate::values::{image::*, length::*, rect::*, color::*, time::Time};
+use crate::values::{image::*, length::*, rect::*, color::*, time::Time, ident::CustomIdent};
 use crate::traits::{Parse, ToCss};
 use crate::printer::Printer;
 use std::fmt::Write;
@@ -231,6 +231,7 @@ pub enum Property {
   LineHeight(LineHeight),
   Font(Font),
 
+  TransitionProperty(Vec<CustomIdent>),
   TransitionDuration(Vec<Time>),
   TransitionDelay(Vec<Time>)
 }
@@ -424,6 +425,7 @@ impl Property {
       "font-variant-caps" => property!(FontVariantCaps, FontVariantCaps),
       "line-height" => property!(LineHeight, LineHeight),
       "font" => property!(Font, Font),
+      "transition-property" => property!(TransitionProperty, CustomIdent, true),
       "transition-duration" => property!(TransitionDuration, Time, true),
       "transition-delay" => property!(TransitionDelay, Time, true),
       _ => {}
@@ -625,6 +627,7 @@ impl Property {
       FontVariantCaps(val) => property!("font-variant-caps", val),
       LineHeight(val) => property!("line-height", val),
       Font(val) => property!("font", val),
+      TransitionProperty(val) => property!("transition-property", val, true),
       TransitionDuration(val) => property!("transition-duration", val, true),
       TransitionDelay(val) => property!("transition-delay", val, true),
       Custom(custom) => {

src/values/ident.rs

@@ -0,0 +1,31 @@
+use cssparser::*;
+use crate::traits::{Parse, ToCss};
+use crate::printer::Printer;
+use std::fmt::Write;
+
+/// https://www.w3.org/TR/css-values-4/#custom-idents
+#[derive(Debug, Clone, PartialEq)]
+pub struct CustomIdent(String);
+
+impl Parse for CustomIdent {
+  fn parse<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, ()>> {
+    let location = input.current_source_location();
+    let ident = input.expect_ident()?;
+    let valid = match_ignore_ascii_case! { ident,
+      "initial" | "inherit" | "unset" | "default" | "revert" => false,
+      _ => true
+    };
+
+    if !valid {
+      return Err(location.new_unexpected_token_error(Token::Ident(ident.clone())))
+    }
+
+    Ok(CustomIdent(ident.as_ref().into()))
+  }
+}
+
+impl ToCss for CustomIdent {
+  fn to_css<W>(&self, dest: &mut Printer<W>) -> std::fmt::Result where W: std::fmt::Write {
+    serialize_identifier(&self.0, dest)
+  }
+}

src/values/mod.rs

@@ -4,3 +4,4 @@ pub mod rect;
 pub mod color;
 pub mod calc;
 pub mod time;
+pub mod ident;