""" Font management system with CJK fallback support. Handles matplotlib and Qt font configuration with licensing-safe approach. """ import os import logging import platform from pathlib import Path from typing import List, Optional, Dict, Any import matplotlib.pyplot as plt import matplotlib.font_manager as fm from PyQt5.QtCore import QCoreApplication from PyQt5.QtGui import QFontDatabase, QFont class FontManager: """ Centralized font management for CJK character support. Provides licensing-safe font fallback by: 1. Loading fonts from local fonts/ directory (gitignored) 2. Falling back to system CJK fonts 3. Gracefully degrading to default fonts """ def __init__(self, fonts_dir: str = "fonts"): """ Initialize font manager. Args: fonts_dir: Directory name for custom fonts (relative to project root) """ self.logger = logging.getLogger(__name__) self.fonts_dir = Path(__file__).parent / fonts_dir self.loaded_fonts: Dict[str, str] = {} self._matplotlib_configured = False self._qt_configured = False # CJK font preferences by platform and type self.system_font_fallbacks = { 'Windows': { 'serif': ['Yu Mincho', 'MS Mincho', '游明朝', 'ＭＳ 明朝'], 'sans-serif': ['Yu Gothic UI', 'Meiryo', 'MS Gothic', '游ゴシック', 'メイリオ', 'ＭＳ ゴシック'], 'monospace': ['MS Gothic', 'ＭＳ ゴシック'] }, 'Darwin': { # macOS 'serif': ['Hiragino Mincho ProN', 'Yu Mincho', 'Times New Roman'], 'sans-serif': ['Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Arial Unicode MS'], 'monospace': ['Menlo', 'Monaco', 'Courier New'] }, 'Linux': { 'serif': ['Noto Serif CJK JP', 'Source Han Serif', 'DejaVu Serif'], 'sans-serif': ['Noto Sans CJK JP', 'Source Han Sans', 'DejaVu Sans'], 'monospace': ['Noto Sans Mono CJK JP', 'Source Code Pro', 'DejaVu Sans Mono'] } } def initialize(self) -> bool: """ Initialize font system for both matplotlib and Qt. Returns: bool: True if initialization was successful """ try: self.logger.info("Initializing font management system...") # Load custom fonts if available custom_fonts_loaded = self._load_custom_fonts() # Configure matplotlib matplotlib_success = self._configure_matplotlib() # Configure Qt qt_success = self._configure_qt() success = matplotlib_success and qt_success if success: self.logger.info(f"Font system initialized successfully. Custom fonts: {custom_fonts_loaded}") else: self.logger.warning("Font system initialized with some issues") return success except Exception as e: self.logger.error(f"Font system initialization failed: {e}") return False def _load_custom_fonts(self) -> int: """ Load fonts from the fonts/ directory if it exists. Returns: int: Number of custom fonts loaded """ if not self.fonts_dir.exists(): self.logger.info(f"Custom fonts directory {self.fonts_dir} not found - using system fonts") return 0 font_extensions = {'.ttf', '.otf', '.ttc'} fonts_loaded = 0 try: for font_file in self.fonts_dir.iterdir(): if font_file.suffix.lower() in font_extensions: try: # Load for matplotlib fm.fontManager.addfont(str(font_file)) # Load for Qt font_id = QFontDatabase.addApplicationFont(str(font_file)) if font_id != -1: font_families = QFontDatabase.applicationFontFamilies(font_id) for family in font_families: self.loaded_fonts[family] = str(font_file) fonts_loaded += 1 self.logger.debug(f"Loaded custom font: {font_file.name} -> {font_families}") else: self.logger.warning(f"Failed to load font for Qt: {font_file.name}") except Exception as e: self.logger.warning(f"Failed to load custom font {font_file.name}: {e}") if fonts_loaded > 0: # Clear matplotlib's font cache to recognize new fonts fm.fontManager._load_fontmanager(try_read_cache=False) except Exception as e: self.logger.error(f"Error loading custom fonts: {e}") return fonts_loaded def _configure_matplotlib(self) -> bool: """Configure matplotlib with appropriate CJK font fallbacks.""" try: current_system = platform.system() fallback_fonts = self.system_font_fallbacks.get(current_system, self.system_font_fallbacks['Linux']) # Build font list: custom fonts + system fallbacks + matplotlib defaults font_list = [] # Add custom fonts first (highest priority) font_list.extend(self.loaded_fonts.keys()) # Add system CJK fonts font_list.extend(fallback_fonts['sans-serif']) # Add matplotlib defaults as final fallback font_list.extend(['DejaVu Sans', 'Arial', 'sans-serif']) # Update matplotlib configuration plt.rcParams['font.sans-serif'] = font_list plt.rcParams['font.family'] = 'sans-serif' # Ensure matplotlib can handle Unicode plt.rcParams['axes.unicode_minus'] = False self.logger.info(f"Matplotlib configured with font list: {font_list[:3]}...") self._matplotlib_configured = True return True except Exception as e: self.logger.error(f"Matplotlib font configuration failed: {e}") return False def _configure_qt(self) -> bool: """Configure Qt application with appropriate CJK fonts.""" try: app = QCoreApplication.instance() if not app: self.logger.warning("No Qt application instance found - Qt font configuration skipped") return True # Get best available CJK font cjk_font = self._get_best_cjk_font() if cjk_font: # Set application-wide font font = QFont(cjk_font) app.setFont(font) self.logger.info(f"Qt configured with CJK font: {cjk_font}") else: self.logger.info("Qt using default system font (no specific CJK font found)") self._qt_configured = True return True except Exception as e: self.logger.error(f"Qt font configuration failed: {e}") return False def _get_best_cjk_font(self) -> Optional[str]: """ Find the best available CJK font for the current system. Returns: str or None: Name of best available CJK font """ # Check custom fonts first for font_name in self.loaded_fonts.keys(): if self._is_cjk_capable(font_name): return font_name # Check system fonts current_system = platform.system() system_fonts = self.system_font_fallbacks.get(current_system, self.system_font_fallbacks['Linux']) available_fonts = set(fm.get_font_names()) for font_name in system_fonts['sans-serif']: if font_name in available_fonts: return font_name return None def _is_cjk_capable(self, font_name: str) -> bool: """ Check if a font supports CJK characters. Simple heuristic based on font name. """ cjk_indicators = [ 'cjk', 'japanese', 'chinese', 'korean', 'han', 'noto', 'yu', 'hiragino', 'meiryo', 'gothic', 'mincho', '游', 'メイリオ', 'ゴシック', '明朝' ] font_lower = font_name.lower() return any(indicator in font_lower for indicator in cjk_indicators) def get_cjk_safe_title(self, title: str, fallback_encoding: str = 'utf-8') -> str: """ Ensure title string is safe for display with current font configuration. Args: title: Original title string fallback_encoding: Encoding to use for problematic characters Returns: str: Safe title string for display """ if not title: return title try: # Test if the string can be encoded/decoded properly title.encode(fallback_encoding).decode(fallback_encoding) return title except UnicodeError: # If there are encoding issues, create a safe fallback safe_title = title.encode(fallback_encoding, errors='replace').decode(fallback_encoding) self.logger.debug(f"Title encoding adjusted: {title[:50]}... -> {safe_title[:50]}...") return safe_title def create_fonts_directory_if_needed(self) -> Path: """ Create the fonts directory and return its path. Useful for setup instructions. Returns: Path: Path to the fonts directory """ self.fonts_dir.mkdir(exist_ok=True) return self.fonts_dir def get_font_installation_instructions(self) -> str: """ Generate user instructions for installing CJK fonts. Returns: str: Multi-line instruction string """ fonts_path = self.create_fonts_directory_if_needed() instructions = f"""CJK Font Installation Instructions: 1. Create or use the fonts directory: {fonts_path.absolute()} 2. Download CJK fonts (legally) from sources like: - Google Fonts (Noto Sans CJK, free & open source) - Adobe Source Han fonts (free & open source) - System fonts from your OS (if redistribution is allowed) 3. Place .ttf, .otf, or .ttc font files in the fonts/ directory 4. Restart the application to load the new fonts Note: The fonts/ directory is gitignored to avoid licensing issues. System CJK fonts will be used as fallback if available. Current system: {platform.system()} Recommended fonts: {', '.join(self.system_font_fallbacks.get(platform.system(), {}).get('sans-serif', ['System default'])[:3])} """ return instructions def get_status_report(self) -> Dict[str, Any]: """ Generate a status report of the font system. Returns: dict: Status information """ return { 'matplotlib_configured': self._matplotlib_configured, 'qt_configured': self._qt_configured, 'custom_fonts_loaded': len(self.loaded_fonts), 'custom_font_families': list(self.loaded_fonts.keys()), 'fonts_directory_exists': self.fonts_dir.exists(), 'fonts_directory_path': str(self.fonts_dir.absolute()), 'current_matplotlib_fonts': plt.rcParams.get('font.sans-serif', [])[:5], 'current_system': platform.system() } # Global font manager instance _font_manager: Optional[FontManager] = None def get_font_manager() -> FontManager: """ Get the global font manager instance. Creates one if it doesn't exist. Returns: FontManager: Global font manager instance """ global _font_manager if _font_manager is None: _font_manager = FontManager() return _font_manager def initialize_fonts() -> bool: """ Initialize the global font system. Call this early in application startup. Returns: bool: True if successful """ return get_font_manager().initialize() def safe_title(title: str) -> str: """ Convenience function to get CJK-safe title. Args: title: Original title Returns: str: Safe title for display """ return get_font_manager().get_cjk_safe_title(title)