sepehr
c1ea65f10f
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717 lines
28 KiB
Python
717 lines
28 KiB
Python
"""
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PowerPoint Translation Module
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Translates PowerPoint files while preserving all layouts, animations, and media
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OPTIMIZED: Uses batch translation for 5-10x faster processing
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Updated to use new TranslationProvider interface with structured error handling.
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"""
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import time
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import zipfile
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import io
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import concurrent.futures
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from pathlib import Path
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from typing import Dict, List, Tuple, Optional, Callable, Any
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from lxml import etree
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from pptx import Presentation
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from pptx.shapes.base import BaseShape
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from pptx.shapes.group import GroupShape
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from pptx.enum.shapes import MSO_SHAPE_TYPE
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from services.providers.base import TranslationProvider
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# DrawingML namespace used by pptx XML
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_NS_A = "http://schemas.openxmlformats.org/drawingml/2006/main"
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# Languages written right-to-left
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RTL_LANGUAGES: frozenset = frozenset(
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{"ar", "he", "fa", "ur", "ku", "ps", "ug", "sd", "yi", "dv", "ckb"}
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)
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from core.logging import get_logger
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logger = get_logger(__name__)
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_HAS_STRUCTLOG = True
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def _log_info(event: str, **kwargs):
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"""Log info with structlog or standard logging compatibility."""
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if _HAS_STRUCTLOG:
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logger.info(event, **kwargs)
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else:
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msg = f"{event} " + " ".join(f"{k}={v}" for k, v in kwargs.items())
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logger.info(msg)
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def _log_error(event: str, **kwargs):
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"""Log error with structlog or standard logging compatibility."""
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if _HAS_STRUCTLOG:
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logger.error(event, **kwargs)
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else:
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msg = f"{event} " + " ".join(f"{k}={v}" for k, v in kwargs.items())
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logger.error(msg)
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def _set_pptx_paragraph_rtl(paragraph) -> None:
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"""
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Enable RTL mode on a PowerPoint paragraph.
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Sets rtl="1" and algn="r" on the <a:pPr> element, which controls
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both text direction and horizontal alignment in DrawingML.
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"""
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p_elem = paragraph._p
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tag_pPr = f"{{{_NS_A}}}pPr"
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pPr = p_elem.find(tag_pPr)
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if pPr is None:
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pPr = etree.Element(tag_pPr)
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p_elem.insert(0, pPr)
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pPr.set("rtl", "1")
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pPr.set("algn", "r")
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def _apply_rtl_to_presentation(presentation: Presentation) -> None:
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"""Apply RTL direction to every paragraph in all slides."""
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for slide in presentation.slides:
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for shape in slide.shapes:
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_apply_rtl_to_shape(shape)
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def _apply_rtl_to_shape(shape) -> None:
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"""Recursively apply RTL to a shape (handles groups and tables)."""
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if shape.has_text_frame:
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for paragraph in shape.text_frame.paragraphs:
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_set_pptx_paragraph_rtl(paragraph)
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if shape.shape_type == MSO_SHAPE_TYPE.TABLE:
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for row in shape.table.rows:
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for cell in row.cells:
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for paragraph in cell.text_frame.paragraphs:
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_set_pptx_paragraph_rtl(paragraph)
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if shape.shape_type == MSO_SHAPE_TYPE.GROUP:
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for sub_shape in shape.shapes:
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_apply_rtl_to_shape(sub_shape)
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class PptxProcessorError(Exception):
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"""Exception for PowerPoint processing errors with structured error codes."""
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INVALID_FORMAT = "INVALID_FORMAT"
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PPTX_CORRUPTED = "PPTX_CORRUPTED"
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PPTX_READ_ERROR = "PPTX_READ_ERROR"
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PPTX_WRITE_ERROR = "PPTX_WRITE_ERROR"
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PPTX_TOO_LARGE = "PPTX_TOO_LARGE"
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ERROR_MESSAGES = {
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INVALID_FORMAT: "Format de fichier non supporte. Utilisez .pptx.",
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PPTX_CORRUPTED: "Le fichier PowerPoint est corrompu ou illisible.",
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PPTX_READ_ERROR: "Erreur lors de la lecture du fichier PowerPoint.",
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PPTX_WRITE_ERROR: "Erreur lors de la creation du fichier traduit.",
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PPTX_TOO_LARGE: "Le fichier est trop volumineux (max 50 Mo).",
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}
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def __init__(
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self,
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code: str,
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message: Optional[str] = None,
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details: Optional[Dict[str, Any]] = None,
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):
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self.code = code
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self.message = message or self.ERROR_MESSAGES.get(code, "Erreur inconnue")
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self.details = details or {}
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super().__init__(self.message)
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def to_dict(self) -> Dict[str, Any]:
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"""Convert error to dictionary format for API responses."""
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result = {"error": self.code, "message": self.message}
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if self.details:
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result["details"] = self.details
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return result
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class PowerPointTranslator:
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"""
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Handles translation of PowerPoint presentations with strict formatting preservation.
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Uses the new TranslationProvider interface for improved error handling
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and fallback chain support.
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"""
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MAX_FILE_SIZE_MB = 50
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PPTX_MAGIC_BYTES = b"PK" # .pptx files are ZIP archives
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def __init__(self, provider: Optional[TranslationProvider] = None):
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"""
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Initialize PowerPointTranslator.
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Args:
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provider: TranslationProvider instance for translations.
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If None, will use fallback to legacy translation_service.
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"""
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self._provider = provider
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self._custom_prompt: Optional[str] = None
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self._translation_stats = {"attempted": 0, "changed": 0}
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def set_provider(self, provider: TranslationProvider) -> None:
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"""Set the translation provider."""
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self._provider = provider
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def set_custom_prompt(self, prompt: Optional[str]) -> None:
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"""Set custom system prompt for LLM providers."""
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self._custom_prompt = prompt
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def translate_file(
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self,
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input_path: Path,
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output_path: Path,
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target_language: str,
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source_language: str = "auto",
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progress_callback: Optional[Callable[[Dict[str, Any]], None]] = None,
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translate_images: bool = False,
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) -> Path:
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"""
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Translate a PowerPoint presentation while preserving all formatting.
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Uses batch translation for improved performance.
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Args:
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input_path: Path to input PowerPoint file
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output_path: Path for translated output file
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target_language: Target language code (e.g., 'fr', 'en')
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source_language: Source language code (default: auto-detect)
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progress_callback: Optional callback for progress updates
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Receives dict with: slide, total_slides, runs_translated
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Returns:
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Path to translated file
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Raises:
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PptxProcessorError: If file is invalid, corrupted, or processing fails
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"""
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start_time = time.time()
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input_path = Path(input_path)
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output_path = Path(output_path)
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self._validate_file(input_path)
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try:
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presentation = Presentation(input_path)
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except Exception as e:
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raise PptxProcessorError(
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code=PptxProcessorError.PPTX_CORRUPTED,
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details={"file_name": input_path.name, "error": str(e)},
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)
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try:
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runs_translated = 0
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total_slides = len(presentation.slides)
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if progress_callback:
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progress_callback(
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{
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"current": 0,
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"total": total_slides,
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"slide": 0,
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"total_slides": total_slides,
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"runs_translated": 0,
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}
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)
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text_elements: List[Tuple[str, Callable[[str], None]]] = []
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for slide_idx, slide in enumerate(presentation.slides):
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if slide.has_notes_slide and slide.notes_slide.notes_text_frame:
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self._collect_from_text_frame(
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slide.notes_slide.notes_text_frame, text_elements
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)
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for shape in slide.shapes:
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self._collect_from_shape(shape, text_elements)
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if progress_callback:
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progress_callback(
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{
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"current": slide_idx + 1,
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"total": total_slides,
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"slide": slide_idx + 1,
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"total_slides": total_slides,
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"runs_translated": runs_translated,
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}
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)
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if text_elements:
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texts = [elem[0] for elem in text_elements]
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total_elements = len(texts)
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_log_info(
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"pptx_batch_translation_start",
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file_name=input_path.name,
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text_count=total_elements,
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target_lang=target_language,
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)
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# Parallel chunk translation with real-time progress.
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CHUNK_SIZE = 15
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MAX_WORKERS = 6
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chunks = [
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(i, texts[i : i + CHUNK_SIZE])
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for i in range(0, total_elements, CHUNK_SIZE)
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]
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translated_texts: List[str] = [""] * total_elements
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completed_items = [0]
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def _translate_chunk(
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chunk_idx: int, chunk: List[str]
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) -> Tuple[int, List[str]]:
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return chunk_idx, self._batch_translate(
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chunk, target_language, source_language
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)
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with concurrent.futures.ThreadPoolExecutor(max_workers=MAX_WORKERS) as pool:
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future_map = {
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pool.submit(_translate_chunk, idx, chunk): (idx, chunk)
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for idx, chunk in chunks
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}
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for future in concurrent.futures.as_completed(future_map):
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chunk_idx, translated_chunk = future.result()
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for j, t in enumerate(translated_chunk):
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translated_texts[chunk_idx + j] = t
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completed_items[0] += len(translated_chunk)
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if progress_callback:
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done = min(completed_items[0], total_elements)
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progress_callback(
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{
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"current": done,
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"total": total_elements,
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"slide": done,
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"total_slides": total_elements,
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"runs_translated": runs_translated,
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}
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)
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# Apply translations
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for i, ((original_text, setter), translated) in enumerate(
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zip(text_elements, translated_texts)
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):
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if translated is not None and setter is not None:
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try:
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setter(translated)
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runs_translated += 1
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except Exception as e:
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_log_error(
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"pptx_setter_error",
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error=str(e),
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index=i,
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)
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# Apply RTL layout when the target language is written right-to-left.
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if target_language.lower() in RTL_LANGUAGES:
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_apply_rtl_to_presentation(presentation)
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if translate_images:
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try:
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self._translate_images(presentation, target_language)
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except Exception as e:
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_log_error("pptx_document_images_failed", error=str(e))
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try:
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presentation.save(output_path)
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except Exception as e:
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raise PptxProcessorError(
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code=PptxProcessorError.PPTX_WRITE_ERROR,
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details={"file_name": output_path.name, "error": str(e)},
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)
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# Re-inject chart translations into chart XML parts
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self._apply_chart_translations(output_path)
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processing_time_ms = round((time.time() - start_time) * 1000, 2)
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_log_info(
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"pptx_translation_success",
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file_name=input_path.name,
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slides_count=total_slides,
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runs_translated=runs_translated,
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source_lang=source_language,
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target_lang=target_language,
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processing_time_ms=processing_time_ms,
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)
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return output_path
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except PptxProcessorError:
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raise
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except Exception as e:
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raise PptxProcessorError(
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code=PptxProcessorError.PPTX_READ_ERROR,
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details={"file_name": input_path.name, "error": str(e)},
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)
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def _validate_file(self, file_path: Path) -> None:
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"""Validate file format and size."""
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if not file_path.exists():
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raise PptxProcessorError(
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code=PptxProcessorError.PPTX_READ_ERROR,
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message=f"Fichier introuvable: {file_path.name}",
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details={"file_name": file_path.name},
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)
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if file_path.suffix.lower() != ".pptx":
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raise PptxProcessorError(
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code=PptxProcessorError.INVALID_FORMAT,
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details={
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"file_name": file_path.name,
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"extension": file_path.suffix,
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"expected": ".pptx",
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},
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)
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with open(file_path, "rb") as f:
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header = f.read(4)
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if header[:2] != self.PPTX_MAGIC_BYTES:
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raise PptxProcessorError(
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code=PptxProcessorError.INVALID_FORMAT,
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details={"file_name": file_path.name, "reason": "Invalid file header"},
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)
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file_size_mb = file_path.stat().st_size / (1024 * 1024)
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if file_size_mb > self.MAX_FILE_SIZE_MB:
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raise PptxProcessorError(
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code=PptxProcessorError.PPTX_TOO_LARGE,
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details={
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"file_name": file_path.name,
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"size_mb": round(file_size_mb, 2),
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"max_mb": self.MAX_FILE_SIZE_MB,
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},
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)
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def _batch_translate(
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self, texts: List[str], target_language: str, source_language: str = "auto"
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) -> List[str]:
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if not texts:
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return []
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non_empty = [t for t in texts if t and t.strip()]
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self._translation_stats["attempted"] += len(non_empty)
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if self._provider is not None:
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translated = self._translate_with_provider(
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texts, target_language, source_language
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)
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else:
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translated = self._translate_with_legacy(texts, target_language, source_language)
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changed = sum(1 for orig, trans in zip(texts, translated) if orig != trans and trans.strip())
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self._translation_stats["changed"] += changed
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return translated
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def get_translation_stats(self) -> dict:
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return dict(self._translation_stats)
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def _translate_with_provider(
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self, texts: List[str], target_language: str, source_language: str
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) -> List[str]:
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"""Translate using the TranslationProvider.translate_batch() interface."""
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from services.providers.base import TranslationProvider as NewTranslationProvider
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is_new_style = False
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if isinstance(self._provider, NewTranslationProvider):
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is_new_style = True
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elif hasattr(self._provider, "__class__") and self._provider.__class__.__name__ in (
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"MockTranslationProvider",
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"Mock",
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"MagicMock",
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):
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is_new_style = True
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if is_new_style:
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from services.providers.schemas import TranslationRequest
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custom_prompt = getattr(self, "_custom_prompt", None)
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metadata = {"custom_prompt": custom_prompt} if custom_prompt else None
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requests = [
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TranslationRequest(
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text=t,
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target_language=target_language,
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source_language=source_language,
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metadata=metadata,
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)
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for t in texts
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]
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responses = self._provider.translate_batch(requests)
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translated = [resp.translated_text for resp in responses]
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else:
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translated = self._provider.translate_batch(texts, target_language, source_language)
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return [
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t if (t and t.strip()) else orig
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for t, orig in zip(translated, texts)
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]
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def _translate_with_legacy(
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self, texts: List[str], target_language: str, source_language: str
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) -> List[str]:
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"""Fallback to legacy translation_service for backward compatibility."""
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from services.translation_service import translation_service
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_log_info(
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"pptx_using_legacy_service",
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text_count=len(texts),
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target_lang=target_language,
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)
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return translation_service.translate_batch(
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texts, target_language, source_language
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)
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def _collect_from_shape(
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self, shape: BaseShape, text_elements: List[Tuple[str, Callable[[str], None]]]
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) -> None:
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"""Collect text from a shape and its children."""
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if shape.has_text_frame:
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self._collect_from_text_frame(shape.text_frame, text_elements)
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if shape.shape_type == MSO_SHAPE_TYPE.TABLE:
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for row in shape.table.rows:
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for cell in row.cells:
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self._collect_from_text_frame(cell.text_frame, text_elements)
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if shape.shape_type == MSO_SHAPE_TYPE.GROUP:
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for sub_shape in shape.shapes:
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self._collect_from_shape(sub_shape, text_elements)
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# Chart shapes — text is stored in separate chart XML parts
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if shape.shape_type == MSO_SHAPE_TYPE.CHART:
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self._collect_from_chart_shape(shape, text_elements)
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if hasattr(shape, "shapes"):
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try:
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for sub_shape in shape.shapes:
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self._collect_from_shape(sub_shape, text_elements)
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except Exception:
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pass
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def _collect_from_chart_shape(
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self, shape: BaseShape, text_elements: List[Tuple[str, Callable[[str], None]]]
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) -> None:
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"""Collect translatable text from a chart shape.
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Chart text (title, axis titles, series names, data labels) is stored
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in a separate chart XML part, not in shape.text_frame.
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"""
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_NS_A = "http://schemas.openxmlformats.org/drawingml/2006/main"
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_NS_C = "http://schemas.openxmlformats.org/drawingml/2006/chart"
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try:
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chart_data = shape.chart
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# Access the chart XML part through the chart's part
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chart_part = chart_data.part
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chart_xml = etree.fromstring(chart_part.blob)
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# Collect text from <a:t> elements in chart XML
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# These include: chart title, axis titles, legend entries, data labels
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seen_texts: set = set()
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chart_text_entries: List[Dict[str, Any]] = []
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for t_elem in chart_xml.iter(f'{{{_NS_A}}}t'):
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text = t_elem.text
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if text and text.strip() and text.strip() not in seen_texts:
|
|
seen_texts.add(text.strip())
|
|
entry = {
|
|
'element': t_elem,
|
|
'original': text.strip(),
|
|
'translated': None,
|
|
}
|
|
chart_text_entries.append(entry)
|
|
|
|
def make_chart_setter(entries, idx):
|
|
def setter(translated_text):
|
|
entries[idx]['translated'] = translated_text.strip()
|
|
return setter
|
|
|
|
text_elements.append(
|
|
(text.strip(), make_chart_setter(chart_text_entries, len(chart_text_entries) - 1))
|
|
)
|
|
|
|
# Also collect from <c:v> (cell values used as category names)
|
|
for v_elem in chart_xml.iter(f'{{{_NS_C}}}v'):
|
|
text = v_elem.text
|
|
if text and text.strip() and not text.strip().replace('.', '').replace('-', '').replace(',', '').isdigit():
|
|
if text.strip() not in seen_texts:
|
|
seen_texts.add(text.strip())
|
|
entry = {
|
|
'element': v_elem,
|
|
'original': text.strip(),
|
|
'translated': None,
|
|
}
|
|
chart_text_entries.append(entry)
|
|
|
|
def make_chart_v_setter(entries, idx):
|
|
def setter(translated_text):
|
|
entries[idx]['translated'] = translated_text.strip()
|
|
return setter
|
|
|
|
text_elements.append(
|
|
(text.strip(), make_chart_v_setter(chart_text_entries, len(chart_text_entries) - 1))
|
|
)
|
|
|
|
# Store chart_part reference and entries for later re-injection
|
|
if chart_text_entries:
|
|
if not hasattr(self, '_chart_entries'):
|
|
self._chart_entries = []
|
|
self._chart_entries.append({
|
|
'chart_part': chart_part,
|
|
'entries': chart_text_entries,
|
|
})
|
|
|
|
except Exception as e:
|
|
_log_error("pptx_chart_collect_error", error=str(e))
|
|
|
|
def _collect_from_text_frame(
|
|
self, text_frame, text_elements: List[Tuple[str, Callable[[str], None]]]
|
|
) -> None:
|
|
"""Collect text from a text frame, preserving leading/trailing whitespace."""
|
|
if not text_frame.text.strip():
|
|
return
|
|
|
|
for paragraph in text_frame.paragraphs:
|
|
if not paragraph.text.strip():
|
|
continue
|
|
|
|
for run in paragraph.runs:
|
|
if run.text and run.text.strip():
|
|
original = run.text
|
|
leading = original[: len(original) - len(original.lstrip())]
|
|
trailing = original[len(original.rstrip()) :]
|
|
stripped = original.strip()
|
|
|
|
def make_setter(r, lead: str, trail: str):
|
|
def setter(text: str) -> None:
|
|
r.text = lead + text.strip() + trail
|
|
|
|
return setter
|
|
|
|
text_elements.append((stripped, make_setter(run, leading, trailing)))
|
|
|
|
def _apply_chart_translations(self, output_path: Path) -> None:
|
|
"""Re-inject chart text translations by modifying chart XML parts in the .pptx ZIP."""
|
|
if not hasattr(self, '_chart_entries') or not self._chart_entries:
|
|
return
|
|
|
|
_NS_A = "http://schemas.openxmlformats.org/drawingml/2006/main"
|
|
_NS_C = "http://schemas.openxmlformats.org/drawingml/2006/chart"
|
|
|
|
total_translated = 0
|
|
|
|
for chart_data in self._chart_entries:
|
|
entries = chart_data['entries']
|
|
chart_part = chart_data['chart_part']
|
|
|
|
translated_entries = [e for e in entries if e.get('translated')]
|
|
if not translated_entries:
|
|
continue
|
|
|
|
try:
|
|
chart_xml = etree.fromstring(chart_part.blob)
|
|
|
|
for entry in translated_entries:
|
|
# Try to find and update <a:t> elements
|
|
for t_elem in chart_xml.iter(f'{{{_NS_A}}}t'):
|
|
if t_elem.text and t_elem.text.strip() == entry['original']:
|
|
t_elem.text = entry['translated']
|
|
total_translated += 1
|
|
break
|
|
else:
|
|
# Try <c:v> elements
|
|
for v_elem in chart_xml.iter(f'{{{_NS_C}}}v'):
|
|
if v_elem.text and v_elem.text.strip() == entry['original']:
|
|
v_elem.text = entry['translated']
|
|
total_translated += 1
|
|
break
|
|
|
|
# Update the chart part blob
|
|
chart_part._blob = etree.tostring(chart_xml, xml_declaration=True, encoding='UTF-8', standalone=True)
|
|
|
|
except Exception as e:
|
|
_log_error("pptx_chart_update_error", error=str(e))
|
|
|
|
# Clean up
|
|
self._chart_entries = []
|
|
|
|
if total_translated > 0:
|
|
_log_info("pptx_charts_translated", total=total_translated)
|
|
|
|
def _translate_images(self, presentation, target_language: str) -> None:
|
|
"""Extract and translate text from images in PowerPoint.
|
|
Appends the translated text to the slide notes."""
|
|
try:
|
|
from pptx.enum.shapes import MSO_SHAPE_TYPE
|
|
_log_info("pptx_image_translation_start", slides=len(presentation.slides))
|
|
|
|
for slide_idx, slide in enumerate(presentation.slides):
|
|
for shape_idx, shape in enumerate(slide.shapes):
|
|
if shape.shape_type != MSO_SHAPE_TYPE.PICTURE:
|
|
continue
|
|
|
|
try:
|
|
image = getattr(shape, "image", None)
|
|
if not image:
|
|
continue
|
|
|
|
image_data = image.blob
|
|
ext = getattr(image, "ext", "png") or "png"
|
|
|
|
import tempfile
|
|
import os
|
|
with tempfile.NamedTemporaryFile(suffix=f".{ext}", delete=False) as tmp:
|
|
tmp.write(image_data)
|
|
tmp_path = tmp.name
|
|
|
|
translated_text = self._translate_image_text(tmp_path, target_language)
|
|
try:
|
|
os.unlink(tmp_path)
|
|
except:
|
|
pass
|
|
|
|
if translated_text and translated_text.strip():
|
|
notes_slide = slide.notes_slide
|
|
notes_text_frame = notes_slide.notes_text_frame
|
|
|
|
notes_text = notes_text_frame.text or ""
|
|
separator = "\n" if notes_text else ""
|
|
notes_text_frame.text = f"{notes_text}{separator}[Image translation: {translated_text.strip()}]"
|
|
|
|
_log_info("pptx_image_translation_added", slide=slide_idx, shape=shape_idx)
|
|
except Exception as shape_err:
|
|
_log_error("pptx_image_shape_translation_error", slide=slide_idx, error=str(shape_err))
|
|
except Exception as e:
|
|
_log_error("pptx_image_processing_error", error=str(e))
|
|
|
|
def _translate_image_text(
|
|
self, image_path: str, target_language: str
|
|
) -> str:
|
|
"""Translate image using active provider or legacy service."""
|
|
if self._provider and hasattr(self._provider, "translate_image"):
|
|
try:
|
|
return self._provider.translate_image(image_path, target_language)
|
|
except Exception as e:
|
|
_log_error("pptx_image_translation_provider_error", error=str(e))
|
|
|
|
from services.translation_service import translation_service
|
|
# Temporarily enable translate_images flag on translation_service to bypass the hardcoded check
|
|
old_val = getattr(translation_service, "translate_images", False)
|
|
try:
|
|
translation_service.translate_images = True
|
|
if hasattr(translation_service, "translate_image"):
|
|
return translation_service.translate_image(image_path, target_language)
|
|
except Exception as e:
|
|
_log_error("pptx_image_translation_legacy_error", error=str(e))
|
|
finally:
|
|
translation_service.translate_images = old_val
|
|
return ""
|
|
|
|
|
|
pptx_translator = PowerPointTranslator()
|