fix broken align and error logic

sandbox/uber.py

@@ -28,7 +28,7 @@ async def on_mount(self):
             Widget(id="uber2-child1"),
             Widget(id="uber2-child2"),
         )
-        first_child = Placeholder(id="child1", classes={"list-item"})
+        first_child = Placeholder(id="child1", classes="list-item")
         uber1 = Widget(
             Placeholder(id="child1", classes="list-item"),
             Placeholder(id="child2", classes="list-item"),

src/textual/app.py

@@ -504,6 +504,7 @@ async def process_messages(self) -> None:
         try:
             if self.css_file is not None:
                 self.stylesheet.read(self.css_file)
+                self.stylesheet.parse()
             if self.css is not None:
                 self.stylesheet.add_source(
                     self.css, path=f"<{self.__class__.__name__}>"

src/textual/css/_help_text.py

@@ -2,6 +2,7 @@
 
 import sys
 from dataclasses import dataclass
+from typing import Iterable
 
 from textual.css._help_renderables import Example, Bullet, HelpText
 from textual.css.constants import (
@@ -229,7 +230,7 @@ def scalar_help_text(
 
 def string_enum_help_text(
     property_name: str,
-    valid_values: list[str],
+    valid_values: Iterable[str],
     context: StylingContext,
 ) -> HelpText:
     """Help text to show when the user supplies an invalid value for a string

src/textual/css/_styles_builder.py

@@ -683,7 +683,7 @@ def align_error(name, token):
 
         if token_vertical.name != "token":
             align_error(name, token_vertical)
-        elif token_horizontal.value not in VALID_ALIGN_VERTICAL:
+        elif token_vertical.value not in VALID_ALIGN_VERTICAL:
             align_error(name, token_horizontal)
 
         name = name.replace("-", "_")
@@ -693,24 +693,26 @@ def align_error(name, token):
     def process_align_horizontal(self, name: str, tokens: list[Token]) -> None:
         try:
             value = self._process_enum(name, tokens, VALID_ALIGN_HORIZONTAL)
-            self.styles._rules[name.replace("-", "_")] = value
         except StyleValueError:
             self.error(
                 name,
                 tokens[0],
                 string_enum_help_text(name, VALID_ALIGN_HORIZONTAL, context="css"),
             )
+        else:
+            self.styles._rules[name.replace("-", "_")] = value
 
     def process_align_vertical(self, name: str, tokens: list[Token]) -> None:
         try:
             value = self._process_enum(name, tokens, VALID_ALIGN_VERTICAL)
-            self.styles._rules[name.replace("-", "_")] = value
         except StyleValueError:
             self.error(
                 name,
                 tokens[0],
                 string_enum_help_text(name, VALID_ALIGN_VERTICAL, context="css"),
             )
+        else:
+            self.styles._rules[name.replace("-", "_")] = value
 
     process_content_align = process_align
     process_content_align_horizontal = process_align_horizontal

src/textual/css/stylesheet.py

@@ -17,7 +17,8 @@
 from rich.syntax import Syntax
 from rich.text import Text
 
-from textual._loop import loop_last
+from .._loop import loop_last
+from .. import log
 from .errors import StylesheetError
 from .match import _check_selectors
 from .model import RuleSet
@@ -39,9 +40,9 @@ def __rich__(self) -> RenderableType:
 
 class StylesheetErrors:
     def __init__(
-        self, stylesheet: "Stylesheet", variables: dict[str, str] | None = None
+        self, rules: list[RuleSet], variables: dict[str, str] | None = None
     ) -> None:
-        self.stylesheet = stylesheet
+        self.rules = rules
         self.variables: dict[str, str] = {}
         self._css_variables: dict[str, list[Token]] = {}
         if variables:
@@ -69,7 +70,7 @@ def __rich_console__(
         self, console: Console, options: ConsoleOptions
     ) -> RenderableType:
         error_count = 0
-        for rule in self.stylesheet.rules:
+        for rule in self.rules:
             for is_last, (token, message) in loop_last(rule.errors):
                 error_count += 1
 
@@ -140,10 +141,6 @@ def rules(self) -> list[RuleSet]:
     def css(self) -> str:
         return "\n\n".join(rule_set.css for rule_set in self.rules)
 
-    @property
-    def error_renderable(self) -> StylesheetErrors:
-        return StylesheetErrors(self)
-
     def set_variables(self, variables: dict[str, str]) -> None:
         """Set CSS variables.
 
@@ -226,7 +223,8 @@ def parse(self) -> None:
         for path, css in self.source.items():
             css_rules = self._parse_rules(css, path)
             if any(rule.errors for rule in css_rules):
-                raise StylesheetParseError(self.error_renderable)
+                error_renderable = StylesheetErrors(css_rules)
+                raise StylesheetParseError(error_renderable)
             add_rules(css_rules)
         self._rules = rules
         self._require_parse = False
@@ -244,7 +242,7 @@ def reparse(self) -> None:
         for path, css in self.source.items():
             stylesheet.add_source(css, path)
         stylesheet.parse()
-        self.rules = stylesheet.rules
+        self._rules = stylesheet.rules
         self.source = stylesheet.source
 
     @classmethod

src/textual/scrollbar.py

@@ -69,7 +69,7 @@ def __init__(
         position: float = 0,
         thickness: int = 1,
         vertical: bool = True,
-        style: StyleType = "ansi_bright_magenta on #555555",
+        style: StyleType = "bright_magenta on #555555",
     ) -> None:
         self.virtual_size = virtual_size
         self.window_size = window_size
@@ -89,7 +89,7 @@ def render_bar(
         thickness: int = 1,
         vertical: bool = True,
         back_color: Color = Color.parse("#555555"),
-        bar_color: Color = Color.parse("ansi_bright_magenta"),
+        bar_color: Color = Color.parse("bright_magenta"),
     ) -> Segments:
 
         if vertical:
@@ -181,7 +181,7 @@ def __rich_console__(
             vertical=self.vertical,
             thickness=thickness,
             back_color=_style.bgcolor or Color.parse("#555555"),
-            bar_color=_style.color or Color.parse("ansi_bright_magenta"),
+            bar_color=_style.color or Color.parse("bright_magenta"),
         )
         yield bar