style: Split values.rs into specified/computed module files

components/style/values/mod.rs

@@ -0,0 +1,98 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Common [values][values] used in CSS.
+//!
+//! [values]: https://drafts.csswg.org/css-values/
+
+pub use cssparser::RGBA;
+
+use app_units::Au;
+use cssparser::CssStringWriter;
+use std::fmt::{self, Write};
+use url::Url;
+
+macro_rules! define_numbered_css_keyword_enum {
+    ($name: ident: $( $css: expr => $variant: ident = $value: expr ),+,) => {
+        define_numbered_css_keyword_enum!($name: $( $css => $variant = $value ),+);
+    };
+    ($name: ident: $( $css: expr => $variant: ident = $value: expr ),+) => {
+        #[allow(non_camel_case_types)]
+        #[derive(Clone, Eq, PartialEq, PartialOrd, Ord, Copy, RustcEncodable, Debug)]
+        #[cfg_attr(feature = "servo", derive(HeapSizeOf, Deserialize, Serialize))]
+        pub enum $name {
+            $( $variant = $value ),+
+        }
+
+        impl $name {
+            pub fn parse(input: &mut ::cssparser::Parser) -> Result<$name, ()> {
+                match_ignore_ascii_case! { try!(input.expect_ident()),
+                    $( $css => Ok($name::$variant), )+
+                    _ => Err(())
+                }
+            }
+        }
+
+        impl ::cssparser::ToCss for $name {
+            fn to_css<W>(&self, dest: &mut W) -> ::std::fmt::Result
+            where W: ::std::fmt::Write {
+                match *self {
+                    $( $name::$variant => dest.write_str($css) ),+
+                }
+            }
+        }
+    }
+}
+
+pub mod computed;
+pub mod specified;
+
+/// The real ToCss trait can't be implemented for types in crates that don't
+/// depend on each other.
+pub trait LocalToCss {
+    /// Serialize `self` in CSS syntax, writing to `dest`.
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write;
+
+    /// Serialize `self` in CSS syntax and return a string.
+    ///
+    /// (This is a convenience wrapper for `to_css` and probably should not be overridden.)
+    #[inline]
+    fn to_css_string(&self) -> String {
+        let mut s = String::new();
+        self.to_css(&mut s).unwrap();
+        s
+    }
+}
+
+impl LocalToCss for Au {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        write!(dest, "{}px", self.to_f64_px())
+    }
+}
+
+impl LocalToCss for Url {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        try!(dest.write_str("url(\""));
+        try!(write!(CssStringWriter::new(dest), "{}", self));
+        try!(dest.write_str("\")"));
+        Ok(())
+    }
+}
+
+pub type CSSFloat = f32;
+
+pub const FONT_MEDIUM_PX: i32 = 16;
+
+pub trait HasViewportPercentage {
+    fn has_viewport_percentage(&self) -> bool;
+}
+
+pub trait NoViewportPercentage {}
+
+impl<T> HasViewportPercentage for T where T: NoViewportPercentage {
+    fn has_viewport_percentage(&self) -> bool {
+        false
+    }
+}
+