Make PredefinedColorSpace follow the convention of parse() and ToCss (#386)

Also bump version to 0.34, because this is a breaking change.

Author: tiaanl

Diff for: Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cssparser"
-version = "0.33.0"
+version = "0.34.0"
 authors = ["Simon Sapin <[email protected]>"]
 
 description = "Rust implementation of CSS Syntax Level 3"
@@ -23,7 +23,7 @@ encoding_rs = "0.8"
 cssparser-macros = { path = "./macros", version = "0.6.1" }
 dtoa-short = "0.3"
 itoa = "1.0"
-phf =  { version = "0.11.2", features = ["macros"] }
+phf = { version = "0.11.2", features = ["macros"] }
 serde = { version = "1.0", features = ["derive"], optional = true }
 smallvec = "1.0"
 

Diff for: color/lib.rs

@@ -18,7 +18,6 @@ use cssparser::color::{
 use cssparser::{match_ignore_ascii_case, CowRcStr, ParseError, Parser, ToCss, Token};
 use std::f32::consts::PI;
 use std::fmt;
-use std::str::FromStr;
 
 /// Return the named color with the given name.
 ///
@@ -402,13 +401,7 @@ fn parse_color_with_color_space<'i, 't, P>(
 where
     P: ColorParser<'i>,
 {
-    let color_space = {
-        let location = arguments.current_source_location();
-
-        let ident = arguments.expect_ident()?;
-        PredefinedColorSpace::from_str(ident)
-            .map_err(|_| location.new_unexpected_token_error(Token::Ident(ident.clone())))?
-    };
+    let color_space = PredefinedColorSpace::parse(arguments)?;
 
     let (c1, c2, c3, alpha) = parse_components(
         color_parser,

Diff for: color/tests.rs

@@ -215,7 +215,7 @@ impl ToJson for Color {
             Color::Oklab(ref c) => json!([c.lightness, c.a, c.b, c.alpha]),
             Color::Oklch(ref c) => json!([c.lightness, c.chroma, c.hue, c.alpha]),
             Color::ColorFunction(ref c) => {
-                json!([c.color_space.as_str(), c.c1, c.c2, c.c3, c.alpha])
+                json!([c.color_space.to_css_string(), c.c1, c.c2, c.c3, c.alpha])
             }
         }
     }

Diff for: src/color.rs

@@ -14,9 +14,8 @@
 /// The opaque alpha value of 1.0.
 pub const OPAQUE: f32 = 1.0;
 
-use crate::ToCss;
+use crate::{BasicParseError, Parser, ToCss, Token};
 use std::fmt;
-use std::str::FromStr;
 
 /// Clamp a 0..1 number to a 0..255 range to u8.
 ///
@@ -99,36 +98,21 @@ pub enum PredefinedColorSpace {
 }
 
 impl PredefinedColorSpace {
-    /// Returns the string value of the predefined color space.
-    pub fn as_str(&self) -> &str {
-        match self {
-            PredefinedColorSpace::Srgb => "srgb",
-            PredefinedColorSpace::SrgbLinear => "srgb-linear",
-            PredefinedColorSpace::DisplayP3 => "display-p3",
-            PredefinedColorSpace::A98Rgb => "a98-rgb",
-            PredefinedColorSpace::ProphotoRgb => "prophoto-rgb",
-            PredefinedColorSpace::Rec2020 => "rec2020",
-            PredefinedColorSpace::XyzD50 => "xyz-d50",
-            PredefinedColorSpace::XyzD65 => "xyz-d65",
-        }
-    }
-}
-
-impl FromStr for PredefinedColorSpace {
-    type Err = ();
+    /// Parse a PredefinedColorSpace from the given input.
+    pub fn parse<'i>(input: &mut Parser<'i, '_>) -> Result<Self, BasicParseError<'i>> {
+        let location = input.current_source_location();
 
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(match_ignore_ascii_case! { s,
-            "srgb" => PredefinedColorSpace::Srgb,
-            "srgb-linear" => PredefinedColorSpace::SrgbLinear,
-            "display-p3" => PredefinedColorSpace::DisplayP3,
-            "a98-rgb" => PredefinedColorSpace::A98Rgb,
-            "prophoto-rgb" => PredefinedColorSpace::ProphotoRgb,
-            "rec2020" => PredefinedColorSpace::Rec2020,
-            "xyz-d50" => PredefinedColorSpace::XyzD50,
-            "xyz" | "xyz-d65" => PredefinedColorSpace::XyzD65,
-
-            _ => return Err(()),
+        let ident = input.expect_ident()?;
+        Ok(match_ignore_ascii_case! { ident,
+            "srgb" => Self::Srgb,
+            "srgb-linear" => Self::SrgbLinear,
+            "display-p3" => Self::DisplayP3,
+            "a98-rgb" => Self::A98Rgb,
+            "prophoto-rgb" => Self::ProphotoRgb,
+            "rec2020" => Self::Rec2020,
+            "xyz-d50" => Self::XyzD50,
+            "xyz" | "xyz-d65" => Self::XyzD65,
+            _ => return Err(location.new_basic_unexpected_token_error(Token::Ident(ident.clone()))),
         })
     }
 }
@@ -138,7 +122,16 @@ impl ToCss for PredefinedColorSpace {
     where
         W: fmt::Write,
     {
-        dest.write_str(self.as_str())
+        dest.write_str(match self {
+            Self::Srgb => "srgb",
+            Self::SrgbLinear => "srgb-linear",
+            Self::DisplayP3 => "display-p3",
+            Self::A98Rgb => "a98-rgb",
+            Self::ProphotoRgb => "prophoto-rgb",
+            Self::Rec2020 => "rec2020",
+            Self::XyzD50 => "xyz-d50",
+            Self::XyzD65 => "xyz-d65",
+        })
     }
 }