Stenographic Data Models

class Stroke:
    """Primary stenographic stroke representation."""
    
    PREFIX_STROKE: 'Stroke' = None
    """Special prefix stroke for system initialization."""
    
    UNDO_STROKE: 'Stroke' = None  
    """Special undo stroke for correction operations."""
    
    @classmethod
    def setup(cls, keys: tuple, implicit_hyphen_keys: frozenset, 
              number_key: str, numbers: dict, feral_number_key: str, 
              undo_stroke: str) -> None:
        """
        Setup stroke system with stenotype system parameters.
        
        Args:
            keys: Available stenographic keys in order
            implicit_hyphen_keys: Keys that imply hyphen placement
            number_key: Key used for number mode
            numbers: Mapping of keys to numbers
            feral_number_key: Alternative number key
            undo_stroke: Stroke pattern for undo operation
            
        Configures global stroke processing for specific stenotype system.
        """
    
    @classmethod
    def from_steno(cls, steno: str) -> 'Stroke':
        """
        Create stroke from steno notation string.
        
        Args:
            steno: Stenographic notation (e.g., 'STKPW')
            
        Returns:
            Stroke instance representing the notation
            
        Parses various steno notation formats into normalized stroke.
        """
    
    @classmethod  
    def from_keys(cls, keys: set) -> 'Stroke':
        """
        Create stroke from set of pressed keys.
        
        Args:
            keys: Set of key strings that were pressed
            
        Returns:
            Stroke instance for the key combination
            
        Converts raw key presses into stenographic stroke.
        """
    
    @classmethod
    def from_integer(cls, integer: int) -> 'Stroke':
        """  
        Create stroke from integer representation.
        
        Args:
            integer: Integer with bits representing pressed keys
            
        Returns:
            Stroke instance for the bit pattern
            
        Converts bit-packed stroke data into stroke object.
        """
    
    @classmethod
    def normalize_stroke(cls, steno: str, strict: bool = True) -> str:
        """
        Normalize stroke notation to standard format.
        
        Args:
            steno: Stroke notation to normalize
            strict: Whether to enforce strict validation
            
        Returns:
            Normalized stroke notation string
            
        Raises:
            ValueError: If stroke notation is invalid and strict=True
        """
    
    @classmethod
    def normalize_steno(cls, steno: str, strict: bool = True) -> str:
        """
        Normalize complete steno notation (multiple strokes).
        
        Args:
            steno: Multi-stroke notation to normalize
            strict: Whether to enforce strict validation
            
        Returns:
            Normalized steno notation string
            
        Processes stroke sequences separated by delimiters.
        """
    
    @classmethod
    def steno_to_sort_key(cls, steno: str, strict: bool = True) -> tuple:
        """
        Create sort key for steno notation.
        
        Args:
            steno: Steno notation to create sort key for
            strict: Whether to enforce strict validation
            
        Returns:
            Tuple suitable for sorting steno notations
            
        Enables consistent alphabetical sorting of stenographic notations.
        """
    
    @property
    def steno_keys(self) -> tuple:
        """
        Get stenographic keys in this stroke.
        
        Returns:
            Tuple of key strings in stenographic order
            
        Provides access to the constituent keys of the stroke.
        """
    
    @property  
    def rtfcre(self) -> str:
        """
        Get RTF/CRE format representation.
        
        Returns:
            Stroke in RTF/CRE dictionary format
            
        Converts stroke to format used in RTF stenographic dictionaries.
        """
    
    @property
    def is_correction(self) -> bool:
        """
        Check if stroke is a correction stroke.
        
        Returns:
            True if stroke represents correction/undo operation
            
        Identifies strokes used for undoing previous translations.
        """

def normalize_stroke(steno: str, strict: bool = True) -> str:
    """
    Normalize individual stroke notation.
    
    Args:
        steno: Stroke notation to normalize  
        strict: Whether to enforce strict validation
        
    Returns:
        Normalized stroke notation
        
    Standalone function for stroke normalization without class context.
    """

def normalize_steno(steno: str, strict: bool = True) -> str:
    """
    Normalize multi-stroke steno notation.
    
    Args:
        steno: Multi-stroke notation to normalize
        strict: Whether to enforce strict validation
        
    Returns:
        Normalized steno notation
        
    Processes complete stenographic phrases with multiple strokes.
    """

def steno_to_sort_key(steno: str, strict: bool = True) -> tuple:
    """
    Create sort key for steno notation.
    
    Args:
        steno: Steno notation to create sort key for
        strict: Whether to enforce strict validation
        
    Returns:
        Tuple for consistent sorting
        
    Enables alphabetical sorting of stenographic entries.
    """

def sort_steno_strokes(strokes_list: list) -> list:
    """
    Sort list of steno strokes alphabetically.
    
    Args:
        strokes_list: List of steno notation strings
        
    Returns:
        Sorted list of steno notations
        
    Uses stenographic sort order rather than ASCII order.
    """

from plover.steno import Stroke, normalize_stroke, sort_steno_strokes

# Create strokes from different formats
stroke1 = Stroke.from_steno('HELLO')
stroke2 = Stroke.from_steno('ST-PB')
stroke3 = Stroke.from_keys({'S', 'T', 'P', 'B'})

# Access stroke properties
keys = stroke1.steno_keys        # ('H', 'E', 'L', 'L', 'O')
rtf_format = stroke1.rtfcre      # RTF representation
is_undo = stroke1.is_correction  # False for regular strokes

# Normalize steno notation
normalized = normalize_stroke('hello')     # 'HELLO' 
normalized = normalize_stroke('St-pB')     # 'STPB'
normalized = normalize_stroke('S T P B')   # 'STPB'

# Handle multi-stroke notation
multi = Stroke.normalize_steno('HELLO/WORLD')  # 'HELLO/WORLD'

# Create sort keys for alphabetical ordering
sort_key1 = Stroke.steno_to_sort_key('APPLE')
sort_key2 = Stroke.steno_to_sort_key('BANANA') 
sort_key1 < sort_key2  # True - Apple comes before Banana

# Sort stroke lists
strokes = ['WORLD', 'HELLO', 'APPLE', 'BANANA']
sorted_strokes = sort_steno_strokes(strokes)
# Result: ['APPLE', 'BANANA', 'HELLO', 'WORLD']

# Work with correction strokes
undo_stroke = Stroke.from_steno('*')
if undo_stroke.is_correction:
    print("This is an undo stroke")

# Convert between formats
stroke = Stroke.from_steno('STKPW')
keys_set = set(stroke.steno_keys)    # {'S', 'T', 'K', 'P', 'W'}
rtf_representation = stroke.rtfcre   # RTF format string

# Handle number mode
number_stroke = Stroke.from_steno('#STKPW')  # Numbers 12345
number_keys = number_stroke.steno_keys

# Error handling with strict mode
try:
    invalid = normalize_stroke('INVALID_KEYS', strict=True)
except ValueError as e:
    print(f"Invalid stroke: {e}")

# Lenient mode for parsing  
maybe_valid = normalize_stroke('MAYBE_VALID', strict=False)

from plover.steno import Stroke

# Example setup for English Stenotype system
Stroke.setup(
    keys=('S-', 'T-', 'K-', 'P-', 'W-', 'H-', 'R-', 'A-', 'O-', 
          '*', '-E', '-U', '-F', '-R', '-P', '-B', '-L', '-G', '-T', '-S', '-D', '-Z'),
    implicit_hyphen_keys=frozenset(['A-', 'O-', '-E', '-U', '*']),
    number_key='#',
    numbers={'S-': '1', 'T-': '2', 'P-': '3', 'H-': '4', 'A-': '5', 
             'O-': '0', '-F': '6', '-P': '7', '-L': '8', '-T': '9'},
    feral_number_key=None,
    undo_stroke='*'
)

# Strict mode - raises exceptions for invalid input
try:
    stroke = Stroke.from_steno('INVALID', strict=True)
except ValueError as e:
    print(f"Invalid stroke: {e}")

# Lenient mode - attempts best-effort parsing
stroke = Stroke.from_steno('maybe_valid', strict=False)
if stroke is None:
    print("Could not parse stroke")

# English Stenotype standard layout
ENGLISH_KEYS = ('S-', 'T-', 'K-', 'P-', 'W-', 'H-', 'R-', 'A-', 'O-', 
                '*', '-E', '-U', '-F', '-R', '-P', '-B', '-L', '-G', '-T', '-S', '-D', '-Z')

# Custom system example
CUSTOM_KEYS = ('Q-', 'W-', 'E-', 'R-', 'T-', 'A-', 'S-', 
               '*', '-D', '-F', '-G', '-H', '-J', '-K', '-L')

from typing import Set, Tuple, List, Dict, Optional, Union, FrozenSet

StenoKey = str
StenoKeys = Tuple[StenoKey, ...]
StenoKeysSet = Set[StenoKey]
StenoNotation = str
StenoSequence = str

StrokeList = List[Stroke]
StenoList = List[StenoNotation]

KeyLayout = Tuple[StenoKey, ...]
ImplicitHyphenKeys = FrozenSet[StenoKey]
NumberMapping = Dict[StenoKey, str]

SortKey = Tuple[int, ...]
StrokeInteger = int

ValidationResult = Union[StenoNotation, None]
NormalizationResult = StenoNotation

class Translation:
    """Data model for mapping between stroke sequences and text strings."""
    
    strokes: List[Stroke]
    rtfcre: Tuple[str, ...]  
    english: str
    replaced: List['Translation']
    formatting: List
    is_retrospective_command: bool
    
    def __init__(self, outline: List[Stroke], translation: str) -> None:
        """
        Create translation from stroke outline and text.
        
        Args:
            outline: List of Stroke objects forming the translation
            translation: Text string result of the translation
            
        Creates translation mapping with formatting state and undo support.
        """
    
    def has_undo(self) -> bool:
        """
        Check if translation can be undone.
        
        Returns:
            True if translation supports undo operation
            
        Determines if translation has formatting state allowing reversal.
        """

class Translator:
    """State machine converting stenographic strokes to translation stream."""
    
    def __init__(self) -> None:
        """Initialize translator with empty state and default dictionary."""
    
    def translate(self, stroke: Stroke) -> List[Translation]:
        """
        Process stroke and return resulting translations.
        
        Args:
            stroke: Stenographic stroke to process
            
        Returns:
            List of translation objects (corrections and new translations)
            
        Maintains translation state and applies greedy matching algorithm.
        """
    
    def set_dictionary(self, dictionary) -> None:
        """
        Set stenographic dictionary for translation lookups.
        
        Args:
            dictionary: StenoDictionaryCollection for translations
            
        Updates translation source and resets internal state.
        """
    
    def add_listener(self, callback) -> None:
        """
        Add callback for translation events.
        
        Args:
            callback: Function receiving translation updates
            
        Registers listener for translation state changes.
        """
    
    def remove_listener(self, callback) -> None:
        """Remove previously added translation listener."""
    
    def set_min_undo_length(self, min_undo_length: int) -> None:
        """
        Set minimum number of strokes kept for undo operations.
        
        Args:
            min_undo_length: Minimum strokes to retain in history
        """

class Formatter:
    """Converts translations into formatted output with proper spacing and capitalization."""
    
    def __init__(self) -> None:
        """Initialize formatter with default output settings."""
    
    def format(self, undo: List[Translation], do: List[Translation], prev: List[Translation]) -> None:
        """
        Format translation sequence with undo and new translations.
        
        Args:
            undo: Translations to undo (backspace operations)
            do: New translations to format and output  
            prev: Previous translation context for formatting state
            
        Processes translation formatting including spacing, capitalization,
        and special formatting commands.
        """
    
    def set_output(self, output) -> None:
        """
        Set output interface for formatted text delivery.
        
        Args:
            output: Output object with send_string, send_backspaces methods
            
        Configures destination for formatted stenographic output.
        """
    
    def add_listener(self, callback) -> None:
        """
        Add listener for formatting events.
        
        Args:
            callback: Function receiving formatting updates
        """
    
    def remove_listener(self, callback) -> None:
        """Remove formatting event listener."""
    
    def set_space_placement(self, placement: str) -> None:
        """
        Configure space placement relative to words.
        
        Args:
            placement: 'Before Output' or 'After Output'
            
        Controls whether spaces appear before or after stenographic output.
        """