[css][bugfix] CSS tokens can now have digits in their names

...excepted for their first char of course

src/textual/css/_styles_builder.py

@@ -461,25 +461,10 @@ class StylesBuilder:
     def process_color(self, name: str, tokens: list[Token]) -> None:
         """Processes a simple color declaration."""
         name = name.replace("-", "_")
-        token_indexes_to_skip = []
-        for i, token in enumerate(tokens):
-            if i in token_indexes_to_skip:
-                continue
+        for token in tokens:
             if token.name in ("color", "token"):
-                value = token.value
-                # Color names can include digits (e.g. "turquoise4"): if the next token is a number
-                # we should consider it part of the color name:
-                next_token = tokens[i + 1] if len(tokens) > (i + 1) else None
-                if (
-                    next_token
-                    and next_token.name == "number"
-                    and next_token.location[1] == token.location[1] + len(value)
-                ):
-                    value = value + next_token.value
-                    # skip next token, as we included it in this one's value:
-                    token_indexes_to_skip.append(i + 1)
                 try:
-                    self.styles._rules[name] = Color.parse(value)
+                    self.styles._rules[name] = Color.parse(token.value)
                 except Exception as error:
                     self.error(
                         name, token, f"failed to parse color {token.value!r}; {error}"

src/textual/css/tokenize.py

@@ -11,7 +11,7 @@ DURATION = r"\d+\.?\d*(?:ms|s)"
 NUMBER = r"\-?\d+\.?\d*"
 COLOR = r"\#[0-9a-fA-F]{8}|\#[0-9a-fA-F]{6}|rgb\(\-?\d+\.?\d*,\-?\d+\.?\d*,\-?\d+\.?\d*\)|rgba\(\-?\d+\.?\d*,\-?\d+\.?\d*,\-?\d+\.?\d*,\-?\d+\.?\d*\)"
 KEY_VALUE = r"[a-zA-Z_-][a-zA-Z0-9_-]*=[0-9a-zA-Z_\-\/]+"
-TOKEN = "[a-zA-Z_-]+"
+TOKEN = "[a-zA-Z][a-zA-Z0-9_-]*"
 STRING = r"\".*?\""
 VARIABLE_REF = r"\$[a-zA-Z0-9_\-]+"