Styling System

class Style(AttributesDictionary):
    """
    Style definition with validated attributes and inheritance.
    
    Parameters:
    - base: Style, optional base style to inherit from
    - **attributes: style attribute key-value pairs
    """
    def __init__(self, base=None, **attributes): ...
    
    def copy(self): ...  # Create deep copy

class Styled(DocumentElement):
    """
    Base class for elements that can be styled.
    
    Attributes:
    - style: Style object or None for element styling
    """
    style = Attribute(Style, None)
    
    def get_style(self, attribute, flowable_target=None): ...
    def get_config_value(self, attribute, document=None): ...

class StyledMeta(type):
    """Metaclass for styled elements providing style attribute registration."""

class StyleSheet(dict):
    """
    Collection of styles with selectors for element targeting.
    
    Parameters:
    - name: str, stylesheet name
    - base: StyleSheet, optional base stylesheet to inherit from
    - matcher: StyledMatcher, custom matching system
    """
    def __init__(self, name, base=None, matcher=None): ...
    
    def __getitem__(self, styled_class): ...  # Get style for element type
    def __setitem__(self, selector, style): ...  # Set style for selector
    def match(self, styled, container): ...  # Find matching style

class StyleSheetFile(StyleSheet):
    """
    StyleSheet loaded from configuration file.
    
    Parameters:
    - file: str or file-like, path to or open file containing stylesheet
    """
    def __init__(self, file): ...

class ClassSelector:
    """
    Select elements by their class/type.
    
    Parameters:
    - styled_class: class to select
    - style: Style to apply to matching elements
    """
    def __init__(self, styled_class, style): ...
    
    def match(self, styled, container): ...  # Check if element matches

class ContextSelector:
    """
    Select elements based on their context/ancestors.
    
    Parameters:
    - *selectors: sequence of parent selectors
    - style: Style to apply to matching elements
    """
    def __init__(self, *selectors, style): ...

# Predefined constants
PARENT_STYLE = ...  # Reference to parent element's style

class StyledMatcher:
    """
    System for matching elements to styles based on selectors.
    
    Parameters:
    - stylesheet: StyleSheet containing style rules
    """
    def __init__(self, stylesheet): ...
    
    def match(self, styled, container): ...  # Find best matching style
    def get_matches(self, styled, container): ...  # Get all matching styles

class AttributeType:
    """
    Base class for style attribute types with validation.
    
    Parameters:
    - default_value: default value for this attribute type
    """
    def __init__(self, default_value=None): ...
    
    def __call__(self, value): ...  # Validate and convert value
    def __repr__(self): ...

class AcceptNoneAttributeType(AttributeType):
    """AttributeType that accepts None as a valid value."""

class Attribute:
    """
    Descriptor for validated style attributes.
    
    Parameters:
    - attribute_type: AttributeType for validation
    - default_value: default value (overrides type default)
    - accepted_type: type or tuple of types for isinstance checking
    """
    def __init__(self, attribute_type, default_value=None, accepted_type=None): ...
    
    def __get__(self, instance, owner): ...
    def __set__(self, instance, value): ...

class OverrideDefault:
    """Override default value in style inheritance."""
    def __init__(self, value): ...

class Bool(AttributeType):
    """
    Boolean attribute type accepting 'true'/'false' strings.
    """
    def __call__(self, value): ...  # Convert to boolean

class Integer(AttributeType):
    """
    Integer attribute type with validation.
    
    Parameters:
    - min_value: int, minimum allowed value
    - max_value: int, maximum allowed value
    """
    def __init__(self, min_value=None, max_value=None): ...

class OptionSet(AttributeType):
    """
    Enumeration-like attribute type with predefined valid values.
    
    Parameters:
    - *values: allowed string values
    """
    def __init__(self, *values): ...

class OptionSetMeta(type):
    """Metaclass for creating OptionSet classes."""

class Configurable:
    """
    Base class for objects with configurable attributes.
    
    Parameters:
    - **configuration: configuration key-value pairs
    """
    def __init__(self, **configuration): ...
    
    def get_config_value(self, attribute, document=None): ...

class RuleSet(list):
    """
    Collection of configuration rules with matching conditions.
    
    Parameters:
    - name: str, ruleset name
    - base: RuleSet, optional base ruleset to inherit from
    """
    def __init__(self, name, base=None): ...
    
    def __getitem__(self, descriptor): ...  # Get value for descriptor
    def __setitem__(self, descriptor, value): ...  # Set rule value

class RuleSetFile(RuleSet):
    """
    RuleSet loaded from configuration file.
    
    Parameters:
    - file: str or file-like, path to or open file containing rules
    """
    def __init__(self, file): ...

class Var:
    """
    Variable reference in configuration files.
    
    Parameters:
    - name: str, variable name to reference
    """
    def __init__(self, name): ...

class AttributesDictionary(dict):
    """
    Dictionary with attribute validation and inheritance support.
    
    Parameters:
    - base_attributes: dict, base attributes to inherit from
    - **attributes: additional attributes
    """
    def __init__(self, base_attributes=None, **attributes): ...
    
    def __getitem__(self, name): ...  # Get attribute value
    def __setitem__(self, name, value): ...  # Set validated attribute
    def copy(self): ...  # Create deep copy
    def update(self, other): ...  # Update with validation

from rinohtype.style import Style, StyleSheet
from rinohtype.color import Color
from rinohtype.dimension import PT
from rinohtype.paragraph import Paragraph, ParagraphStyle

# Create individual styles
heading_style = Style(
    font_size=16*PT,
    font_weight='bold',
    text_color=Color(0, 0, 0.5),
    space_above=12*PT,
    space_below=6*PT
)

body_style = Style(
    font_size=11*PT,
    line_spacing=1.2,
    text_align='justify',
    space_below=6*PT
)

# Apply styles to elements
heading = Paragraph("Chapter Title", style=heading_style)
content = Paragraph("This is the body text...", style=body_style)

from rinohtype.style import StyleSheet, ClassSelector
from rinohtype.paragraph import ParagraphStyle
from rinohtype.structure import Heading

# Create stylesheet with selectors
stylesheet = StyleSheet('custom')

# Define styles for different element types  
stylesheet[Paragraph] = ParagraphStyle(
    font_family='serif',
    font_size=11*PT,
    line_spacing=1.2
)

stylesheet[Heading] = ParagraphStyle(
    base=stylesheet[Paragraph],  # Inherit from paragraph
    font_size=16*PT,
    font_weight='bold',
    space_above=12*PT
)

# Context-sensitive styling
from rinohtype.style import ContextSelector
from rinohtype.structure import ListItem

stylesheet[ContextSelector(List, Paragraph)] = ParagraphStyle(
    base=stylesheet[Paragraph],
    space_below=3*PT  # Less space in lists
)

from rinohtype.attribute import AttributeType, OptionSet

class FontWeight(OptionSet):
    """Font weight attribute type."""
    values = ('normal', 'bold', '100', '200', '300', '400', '500', '600', '700', '800', '900')

class TextAlign(OptionSet):
    """Text alignment attribute type."""  
    values = ('left', 'center', 'right', 'justify')

# Use in style definitions
custom_style = Style(
    font_weight=FontWeight('bold'),
    text_align=TextAlign('center')
)

from rinohtype.attribute import RuleSet, Var

# Create configuration rules
config = RuleSet('document_config')

# Set variables
config['title_font_size'] = 18*PT
config['body_font_size'] = 11*PT

# Use variables in styles
title_style = Style(
    font_size=Var('title_font_size'),
    font_weight='bold'
)

# Conditional rules based on document properties
config[('paper_size', 'A4')] = {
    'margin_left': 25*MM,
    'margin_right': 25*MM
}

config[('paper_size', 'LETTER')] = {
    'margin_left': 1*INCH,
    'margin_right': 1*INCH
}

from rinohtype.attribute import ParseError

try:
    # Invalid style attribute
    invalid_style = Style(font_size='invalid')
except ParseError as e:
    print(f"Style parsing error: {e}")

try:
    # Load stylesheet from file
    stylesheet = StyleSheetFile('styles.conf')
except (FileNotFoundError, ParseError) as e:
    print(f"Stylesheet loading error: {e}")