1 files changed, 156 insertions, 0 deletions
diff --git a/servo/components/style/values/generics/text.rs b/servo/components/style/values/generics/text.rs
new file mode 100644
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+++ b/servo/components/style/values/generics/text.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/. */
+
+//! Generic types for text properties.
+
+use crate::parser::ParserContext;
+use crate::values::animated::ToAnimatedZero;
+use cssparser::Parser;
+use style_traits::ParseError;
+
+/// A generic value for the `initial-letter` property.
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+pub enum InitialLetter<Number, Integer> {
+    /// `normal`
+    Normal,
+    /// `<number> <integer>?`
+    Specified(Number, Option<Integer>),
+}
+
+impl<N, I> InitialLetter<N, I> {
+    /// Returns `normal`.
+    #[inline]
+    pub fn normal() -> Self {
+        InitialLetter::Normal
+    }
+}
+
+/// A generic spacing value for the `letter-spacing` and `word-spacing` properties.
+#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
+pub enum Spacing<Value> {
+    /// `normal`
+    Normal,
+    /// `<value>`
+    Value(Value),
+}
+
+impl<Value> Spacing<Value> {
+    /// Returns `normal`.
+    #[inline]
+    pub fn normal() -> Self {
+        Spacing::Normal
+    }
+
+    /// Parses.
+    #[inline]
+    pub fn parse_with<'i, 't, F>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+        parse: F,
+    ) -> Result<Self, ParseError<'i>>
+    where
+        F: FnOnce(&ParserContext, &mut Parser<'i, 't>) -> Result<Value, ParseError<'i>>,
+    {
+        if input
+            .try_parse(|i| i.expect_ident_matching("normal"))
+            .is_ok()
+        {
+            return Ok(Spacing::Normal);
+        }
+        parse(context, input).map(Spacing::Value)
+    }
+}
+
+#[cfg(feature = "gecko")]
+fn line_height_moz_block_height_enabled(context: &ParserContext) -> bool {
+    context.in_ua_sheet() ||
+        static_prefs::pref!("layout.css.line-height-moz-block-height.content.enabled")
+}
+
+/// A generic value for the `line-height` property.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToCss,
+    ToShmem,
+    Parse,
+)]
+#[repr(C, u8)]
+pub enum GenericLineHeight<N, L> {
+    /// `normal`
+    Normal,
+    /// `-moz-block-height`
+    #[cfg(feature = "gecko")]
+    #[parse(condition = "line_height_moz_block_height_enabled")]
+    MozBlockHeight,
+    /// `<number>`
+    Number(N),
+    /// `<length-percentage>`
+    Length(L),
+}
+
+pub use self::GenericLineHeight as LineHeight;
+
+impl<N, L> ToAnimatedZero for LineHeight<N, L> {
+    #[inline]
+    fn to_animated_zero(&self) -> Result<Self, ()> {
+        Err(())
+    }
+}
+
+impl<N, L> LineHeight<N, L> {
+    /// Returns `normal`.
+    #[inline]
+    pub fn normal() -> Self {
+        LineHeight::Normal
+    }
+}
+
+/// Implements type for text-decoration-thickness
+/// which takes the grammar of auto | from-font | <length> | <percentage>
+///
+/// https://drafts.csswg.org/css-text-decor-4/
+#[repr(C, u8)]
+#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
+#[derive(
+    Animate,
+    Clone,
+    Copy,
+    ComputeSquaredDistance,
+    ToAnimatedZero,
+    Debug,
+    Eq,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[allow(missing_docs)]
+pub enum GenericTextDecorationLength<L> {
+    LengthPercentage(L),
+    Auto,
+    FromFont,
+}