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"""TextContent value object for representing text data with language and encoding validation."""
from dataclasses import dataclass
from typing import Optional
import re
@dataclass(frozen=True)
class TextContent:
"""Value object representing text content with language and encoding information."""
text: str
language: str
encoding: str = 'utf-8'
def __post_init__(self):
"""Validate text content after initialization."""
self._validate()
def _validate(self):
"""Validate text content properties."""
if not isinstance(self.text, str):
raise TypeError("Text must be a string")
if not self.text.strip():
raise ValueError("Text content cannot be empty or whitespace only")
if len(self.text) > 50000: # Reasonable limit for TTS processing
raise ValueError("Text content too long (maximum 50,000 characters)")
if not isinstance(self.language, str):
raise TypeError("Language must be a string")
if not self.language.strip():
raise ValueError("Language cannot be empty")
# Validate language code format (ISO 639-1 or ISO 639-3)
if not re.match(r'^[a-z]{2,3}(-[A-Z]{2})?$', self.language):
raise ValueError(f"Invalid language code format: {self.language}. Expected format: 'en', 'en-US', etc.")
if not isinstance(self.encoding, str):
raise TypeError("Encoding must be a string")
if self.encoding not in ['utf-8', 'utf-16', 'ascii', 'latin-1']:
raise ValueError(f"Unsupported encoding: {self.encoding}. Supported: utf-8, utf-16, ascii, latin-1")
# Validate that text can be encoded with specified encoding
try:
self.text.encode(self.encoding)
except UnicodeEncodeError:
raise ValueError(f"Text cannot be encoded with {self.encoding} encoding")
@property
def word_count(self) -> int:
"""Get the approximate word count of the text."""
return len(self.text.split())
@property
def character_count(self) -> int:
"""Get the character count of the text."""
return len(self.text)
@property
def is_empty(self) -> bool:
"""Check if the text content is effectively empty."""
return not self.text.strip()
def truncate(self, max_length: int) -> 'TextContent':
"""Create a new TextContent with truncated text."""
if max_length <= 0:
raise ValueError("Max length must be positive")
if len(self.text) <= max_length:
return self
truncated_text = self.text[:max_length].rstrip()
return TextContent(
text=truncated_text,
language=self.language,
encoding=self.encoding
) |