Add euph-specific config

cheuph/euphoria/euph_config.py

@@ -0,0 +1,124 @@
+from typing import Any, Dict, List, Optional, TypeVar
+
+from ..config import (ConfigValueException, Kind, Option, TransparentConfig,
+                      TreeLoader)
+
+__all__ = ["EuphConfig", "EuphLoader"]
+
+class EuphConfig(TransparentConfig):
+
+    def __init__(self, parent: Optional[TransparentConfig] = None) -> None:
+        super().__init__(parent)
+
+    @property
+    def room_style(self) -> str:
+        return self["visual.room_style"]
+
+    @property
+    def error_style(self) -> str:
+        return self["visual.error.style"]
+
+    @property
+    def error_room_style(self) -> str:
+        return self["visual.error.room_style"]
+
+    @property
+    def palette(self) -> Any:
+        return self["palette"]
+
+class EuphLoader(TreeLoader):
+
+    STYLE_PROPERTIES = [
+            "visual.room_style",
+            "visual.error.style",
+            "visual.error.room_style",
+    ]
+
+    DEFAULT_STYLES = {
+            "room": {"fg": "bold, light blue"},
+            "error": {"fg": "light red"},
+            "error_room": {"fg": "bold, yellow"},
+    }
+
+    def __init__(self) -> None:
+        super().__init__()
+
+        self.add_option("visual.room_style", Option(Kind.STR, "room"))
+        self.add_option("visual.error.style", Option(Kind.STR, "error"))
+        self.add_option("visual.error.room_style", Option(Kind.STR, "error_room"))
+        self.add_option("styles", Option(Kind.DICT, self.DEFAULT_STYLES))
+
+    def load_to(self, config: TransparentConfig, data: Any) -> None:
+        super().load_to(config, data)
+
+        styles = self._get_styles(config)
+        self._check_style_properties(config, styles)
+        config["palette"] = self._load_palette(styles)
+
+    def _get_styles(self, config: TransparentConfig) -> Dict[str, Dict[str, str]]:
+        # First, collect all the styles from front to back
+        style_list = []
+        current_config = config
+        while current_config is not None:
+            try:
+                style_list.append(current_config.get("styles"))
+            except ConfigValueException:
+                pass
+
+            current_config = current_config.parent
+
+        # Then, mush them together in reverse order
+        styles: Dict[str, Dict[str, str]] = {}
+        for style in reversed(style_list):
+            if type(style) is not dict:
+                raise ConfigValueException("invalid styles format")
+
+            for name, info in style.items():
+                if type(name) is not str:
+                    raise ConfigValueException(
+                        f"style {name!r} has to be named with a string")
+
+                if info is None:
+                    styles[name] = {}
+                    continue
+
+                if type(info) is not dict:
+                    raise ConfigValueException(
+                            f"style {name!r} has an incorrect value")
+
+                for key, value in info.items():
+                    if type(key) is not str or type(value) is not str:
+                        raise ConfigValueException(
+                                f"style {name!r} has an incorrect value")
+
+                styles[name] = info
+
+        return styles
+
+    def _load_palette(self, styles: Dict[str, Dict[str, str]]) -> List[Any]:
+        palette: List[Any] = []
+
+        for style, info in styles.items():
+            keys = set(info.keys())
+
+            if keys == {"alias"}:
+                palette.append((style, info["alias"]))
+            elif keys.issubset({"fg", "bg"}):
+                fg = info.get("fg", "")
+                bg = info.get("bg", "")
+                palette.append((style, fg, bg))
+            else:
+                raise ConfigValueException(f"style {style} has an incorrect format")
+
+        return palette
+
+    def _check_style_properties(self,
+            config: TransparentConfig,
+            styles: Dict[str, Dict[str, str]],
+            ) -> None:
+
+        for name in self.STYLE_PROPERTIES:
+            style_name = config.get(name)
+            if style_name not in styles:
+                raise ConfigValueException((f"style {style_name!r} is not"
+                        " specified in the styles section"))