Reduce binary size and improve performance

Author: devongovett

Cargo.toml

@@ -64,3 +64,5 @@ required-features = ["cli"]
 
 [profile.release]
 lto = true
+codegen-units = 1
+panic = 'abort'

README.md

@@ -155,14 +155,14 @@ css-minimizer-webpack-plugin has builtin support for `@parcel/css`. Install `@pa
 
 ```
 $ node bench.js bootstrap-4.css 
-cssnano: 542.879ms
+cssnano: 544.809ms
 159636 bytes
 
-esbuild: 16.839ms
+esbuild: 17.199ms
 160332 bytes
 
-parcel-css: 4.345ms
-143121 bytes
+parcel-css: 4.16ms
+143091 bytes
 
 
 $ node bench.js animate.css

src/parser.rs

@@ -711,6 +711,7 @@ impl<'a, 'b, 'i> QualifiedRuleParser<'i> for StyleRuleParser<'a, 'i> {
   }
 }
 
-fn starts_with_ignore_ascii_case(string: &str, prefix: &str) -> bool {
+#[inline]
+pub fn starts_with_ignore_ascii_case(string: &str, prefix: &str) -> bool {
   string.len() >= prefix.len() && string.as_bytes()[0..prefix.len()].eq_ignore_ascii_case(prefix.as_bytes())
 }

src/properties/custom.rs

@@ -211,6 +211,10 @@ fn try_parse_color_token<'i, 't>(f: &CowArcStr<'i>, state: &ParserState, input:
 
 impl<'i> ToCss for TokenList<'i> {
   fn to_css<W>(&self, dest: &mut Printer<W>) -> Result<(), PrinterError> where W: std::fmt::Write {
+    if !dest.minify && self.0.len() == 1 && matches!(self.0.first(), Some(token) if token.is_whitespace()) {
+      return Ok(())
+    }
+
     for (i, token_or_value) in self.0.iter().enumerate() {
       match token_or_value {
         TokenOrValue::Color(color) => color.to_css(dest)?,