Switch to lightningcss from csscompressor (#33)

pyproject.toml

@@ -37,7 +37,7 @@ markdown = ["anchovy[jinja]", "markdown_it_py>=3.0.0"]
 css = ["tinycss2>=1.1.1"]
 pretty = ["rich>=12.5.1"]
 pillow = ["Pillow>=9.2.0"]
-minify = ["csscompressor>=0.9.5", "minify-html-onepass>=0.11.1"]
+minify = ["lightningcss>=0.1.1,<1.0", "minify-html-onepass>=0.11.1"]
 web = ["anchovy[markdown]", "anchovy[css]", "anchovy[pillow]", "anchovy[minify]"]
 base = ["anchovy[web]", "anchovy[pretty]"]
 # Currently, [all] is the same as [base]; this will change in the future if

src/anchovy/minify.py

@@ -27,15 +27,37 @@ def __call__(self, path: Path, output_paths: list[Path]):
 
 class CSSMinifierStep(Step):
     encoding = 'utf-8'
+
     @classmethod
     def get_dependencies(cls):
         return {
-            pip_dependency('csscompressor'),
+            pip_dependency('lightningcss')
         }
 
+    def __init__(self,
+                 error_recovery: bool = False,
+                 parser_flags: dict[str, bool] | None = None,
+                 unused_symbols: set[str] | None = None,
+                 browsers_list: list[str] | None = ['defaults'],
+                 minify: bool = True):
+
+        self.error_recovery = error_recovery
+        self.parser_flags = parser_flags or {}
+        self.unused_symbols = unused_symbols
+        self.browsers_list = browsers_list
+        self.minify = minify
+
     def __call__(self, path: Path, output_paths: list[Path]):
-        import csscompressor
-        data = csscompressor.compress(path.read_text(self.encoding))
+        import lightningcss
+        data = lightningcss.process_stylesheet(
+            path.read_text(self.encoding),
+            filename=str(path),
+            error_recovery=self.error_recovery,
+            parser_flags=lightningcss.calc_parser_flags(**self.parser_flags),
+            unused_symbols=self.unused_symbols,
+            browsers_list=self.browsers_list,
+            minify=self.minify
+        )
         for o_path in output_paths:
             o_path.parent.mkdir(parents=True, exist_ok=True)
         output_paths[0].write_text(data, self.encoding)