1 files changed, 99 insertions, 0 deletions
diff --git a/servo/components/style/values/specified/page.rs b/servo/components/style/values/specified/page.rs
new file mode 100644
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+++ b/servo/components/style/values/specified/page.rs
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+/* 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 https://mozilla.org/MPL/2.0/. */
+
+//! Specified @page at-rule properties and named-page style properties
+
+use crate::parser::{Parse, ParserContext};
+use crate::values::generics::size::Size2D;
+use crate::values::specified::length::NonNegativeLength;
+use crate::values::{generics, CustomIdent};
+use cssparser::Parser;
+use style_traits::ParseError;
+
+pub use generics::page::PageOrientation;
+pub use generics::page::PageSizeOrientation;
+pub use generics::page::PaperSize;
+/// Specified value of the @page size descriptor
+pub type PageSize = generics::page::PageSize<Size2D<NonNegativeLength>>;
+
+impl Parse for PageSize {
+    fn parse<'i, 't>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self, ParseError<'i>> {
+        // Try to parse as <page-size> [ <orientation> ]
+        if let Ok(paper_size) = input.try_parse(PaperSize::parse) {
+            let orientation = input
+                .try_parse(PageSizeOrientation::parse)
+                .unwrap_or(PageSizeOrientation::Portrait);
+            return Ok(PageSize::PaperSize(paper_size, orientation));
+        }
+        // Try to parse as <orientation> [ <page-size> ]
+        if let Ok(orientation) = input.try_parse(PageSizeOrientation::parse) {
+            if let Ok(paper_size) = input.try_parse(PaperSize::parse) {
+                return Ok(PageSize::PaperSize(paper_size, orientation));
+            }
+            return Ok(PageSize::Orientation(orientation));
+        }
+        // Try to parse dimensions
+        if let Ok(size) =
+            input.try_parse(|i| Size2D::parse_with(context, i, NonNegativeLength::parse))
+        {
+            return Ok(PageSize::Size(size));
+        }
+        // auto value
+        input.expect_ident_matching("auto")?;
+        Ok(PageSize::Auto)
+    }
+}
+
+/// Page name value.
+///
+/// https://drafts.csswg.org/css-page-3/#using-named-pages
+#[derive(
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToCss,
+    ToComputedValue,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C, u8)]
+pub enum PageName {
+    /// `auto` value.
+    Auto,
+    /// Page name value
+    PageName(CustomIdent),
+}
+
+impl Parse for PageName {
+    fn parse<'i, 't>(
+        _context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self, ParseError<'i>> {
+        let location = input.current_source_location();
+        let ident = input.expect_ident()?;
+        Ok(match_ignore_ascii_case! { ident,
+            "auto" => PageName::auto(),
+            _ => PageName::PageName(CustomIdent::from_ident(location, ident, &[])?),
+        })
+    }
+}
+
+impl PageName {
+    /// `auto` value.
+    #[inline]
+    pub fn auto() -> Self {
+        PageName::Auto
+    }
+
+    /// Whether this is the `auto` value.
+    #[inline]
+    pub fn is_auto(&self) -> bool {
+        matches!(*self, PageName::Auto)
+    }
+}