py_enjoy/kit/Prop.py

#!/usr/bin/env python3.9
# -*- coding: utf-8 -*-
"""
JFinal Prop - Properties File Handler
"""

import os
from typing import Optional

class Prop:
    """Properties file handler"""
    
    DEFAULT_ENCODING = "UTF-8"
    
    def __init__(self, file_name_or_content=None, encoding: str = DEFAULT_ENCODING, is_file: bool = True):
        """
        Initialize Prop
        
        Args:
            file_name_or_content: file name (if is_file=True) or content string
            encoding: encoding for reading properties file
            is_file: True if first parameter is file name, False if it's content string
        """
        self._properties = {}
        
        if file_name_or_content is None:
            return
        
        if is_file:
            self._load_from_file(file_name_or_content, encoding)
        else:
            self._load_from_content(file_name_or_content, encoding)
    
    def _load_from_file(self, file_name: str, encoding: str):
        """Load properties from file"""
        try:
            # Try to find file in classpath first
            import importlib.resources
            try:
                with importlib.resources.open_text(file_name, encoding=encoding) as f:
                    self._parse_properties(f.read())
                return
            except (FileNotFoundError, TypeError):
                pass
            
            # Try as absolute file path
            if os.path.isabs(file_name):
                file_path = file_name
            else:
                file_path = os.path.join(os.getcwd(), file_name)
            
            if not os.path.exists(file_path):
                raise FileNotFoundError(f"Properties file not found: {file_name}")
            
            with open(file_path, 'r', encoding=encoding) as f:
                self._parse_properties(f.read())
                
        except Exception as e:
            raise RuntimeError(f"Error loading properties file: {e}")
    
    def _load_from_content(self, content: str, encoding: str):
        """Load properties from content string"""
        try:
            self._parse_properties(content)
        except Exception as e:
            raise RuntimeError(f"Error parsing properties content: {e}")
    
    def _parse_properties(self, content: str):
        """Parse properties content"""
        for line in content.split('\n'):
            line = line.strip()
            
            # Skip empty lines and comments
            if not line or line.startswith('#') or line.startswith('!'):
                continue
            
            # Handle line continuation
            while line.endswith('\\'):
                line = line[:-1].strip()
                # This is a simplified implementation
            
            # Find the first separator
            separator_idx = -1
            for sep in ['=', ':']:
                idx = line.find(sep)
                if idx != -1:
                    if separator_idx == -1 or idx < separator_idx:
                        separator_idx = idx
            
            if separator_idx == -1:
                # No separator, treat as key with empty value
                key = line.strip()
                value = ""
            else:
                key = line[:separator_idx].strip()
                value = line[separator_idx + 1:].strip()
            
            if key:
                self._properties[key] = value
    
    def get(self, key: str, default_value: str = None) -> Optional[str]:
        """Get property value"""
        value = self._properties.get(key)
        if value is not None and len(value) != 0:
            return value.strip()
        return default_value
    
    def get_int(self, key: str, default_value: int = None) -> Optional[int]:
        """Get property as integer"""
        value = self.get(key)
        if value is not None:
            return int(value)
        return default_value
    
    def get_long(self, key: str, default_value: int = None) -> Optional[int]:
        """Get property as long integer"""
        value = self.get(key)
        if value is not None:
            return int(value)
        return default_value
    
    def get_double(self, key: str, default_value: float = None) -> Optional[float]:
        """Get property as double"""
        value = self.get(key)
        if value is not None:
            return float(value)
        return default_value
    
    def get_boolean(self, key: str, default_value: bool = None) -> Optional[bool]:
        """Get property as boolean"""
        value = self.get(key)
        if value is not None:
            value_lower = value.lower().strip()
            if value_lower == "true":
                return True
            elif value_lower == "false":
                return False
            else:
                raise ValueError(f"Cannot parse boolean value: {value}")
        return default_value
    
    def contains_key(self, key: str) -> bool:
        """Check if key exists"""
        return key in self._properties
    
    def is_empty(self) -> bool:
        """Check if properties is empty"""
        return len(self._properties) == 0
    
    def not_empty(self) -> bool:
        """Check if properties is not empty"""
        return not self.is_empty()
    
    def append(self, prop) -> 'Prop':
        """Append properties from another Prop"""
        if prop is None:
            raise ValueError("prop cannot be None")
        
        for key, value in prop.get_properties().items():
            self._properties[key] = value
        
        return self
    
    def get_properties(self) -> dict:
        """Get all properties"""
        return self._properties.copy()