mirror of
https://github.com/denizsafak/abogen.git
synced 2026-07-18 13:40:27 +02:00
Further refactoring of book_handler logic into PDFParser
Also deletes the unnencessary abogen/book_handler and just use pyqt/book_hanlder
This commit is contained in:
Mohan Krishnan
File diff suppressed because it is too large
Load Diff
+133
-16
@@ -110,41 +110,158 @@ class PdfParser(BaseBookParser):
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logging.error(f"Error loading PDF {self.book_path}: {e}")
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raise
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def _extract_book_metadata(self):
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# PDF metadata extraction can be added here if needed
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# For now, base class metadata is empty dict
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pass
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def process_content(self, replace_single_newlines=True):
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if not self.pdf_doc:
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self.load()
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# 1. Extract text from all pages first
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for page_num in range(len(self.pdf_doc)):
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text = clean_text(self.pdf_doc[page_num].get_text())
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# Clean up common PDF artifacts:
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# - Remove bracketed numbers often used for citations [1]
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text = _BRACKETED_NUMBERS_PATTERN.sub("", text)
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# - Remove standalone page numbers often found in headers/footers
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text = _STANDALONE_PAGE_NUMBERS_PATTERN.sub("", text)
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# - Remove page numbers at end of lines
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text = _PAGE_NUMBERS_AT_END_PATTERN.sub("", text)
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# - Remove page numbers with dashes - 4 -
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text = _PAGE_NUMBERS_WITH_DASH_PATTERN.sub("", text)
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page_id = f"page_{page_num + 1}"
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self.content_texts[page_id] = text
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self.content_lengths[page_id] = calculate_text_length(text)
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# 2. Build Navigation Structure
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toc = self.pdf_doc.get_toc()
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if not toc:
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# Fallback: Flat list of pages if no TOC
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self.processed_nav_structure = []
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pages_node = {
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"title": "Pages",
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"src": None,
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"children": [],
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"has_content": False
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}
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# Add all pages as children
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for page_num in range(len(self.pdf_doc)):
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page_id = f"page_{page_num + 1}"
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title = self._get_page_title(page_num, self.content_texts.get(page_id, ""))
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pages_node["children"].append({
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"title": title,
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"src": page_id,
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"children": [],
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"has_content": True
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})
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self.processed_nav_structure.append(pages_node)
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else:
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self.processed_nav_structure = self._build_structure_from_toc(toc)
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return self.content_texts, self.content_lengths
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def _extract_book_metadata(self):
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# PDF metadata extraction can be added here if needed
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# For now, base class metadata is empty dict
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pass
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def _get_page_title(self, page_num, text):
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title = f"Page {page_num + 1}"
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if text:
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first_line = text.split("\n", 1)[0].strip()
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if first_line and len(first_line) < 100:
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title += f" - {first_line}"
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return title
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def get_chapters(self):
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# PDF specific implementation because it doesn't use nav structure
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chapters = []
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if self.pdf_doc:
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for i in range(len(self.pdf_doc)):
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chapters.append((f"page_{i+1}", f"Page {i+1}"))
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return chapters
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def _build_structure_from_toc(self, toc):
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# 1. Flatten TOC to easier list (page_num, title, level)
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# fitz TOC is [[lvl, title, page, dest], ...]
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bookmarks = []
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for entry in toc:
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lvl, title, page = entry[:3]
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if isinstance(page, int):
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page_idx = page - 1
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else:
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# Handle potential complex destinations if necessary, but usually simple int
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# PyMuPDF docs say int.
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page_idx = -1
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if page_idx >= 0:
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bookmarks.append({"level": lvl, "title": title, "page": page_idx})
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root_children = []
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stack = [] # Stack of (level, list_to_append_to)
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stack.append((0, root_children))
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# Step 1: Build the Skeleton Tree from TOC
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# And keep a flat list of these nodes to associate with pages.
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processed_nodes = [] # List of (page_idx, node_dict)
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for entry in bookmarks:
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node = {
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"title": entry["title"],
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"src": f"page_{entry['page'] + 1}",
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"children": [],
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"has_content": True
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}
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# Find parent
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level = entry["level"]
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# Adjust stack
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while stack and stack[-1][0] >= level:
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stack.pop()
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parent_list = stack[-1][1]
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parent_list.append(node)
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stack.append((level, node["children"]))
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processed_nodes.append((entry["page"], node))
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# Step 3: Add gap pages.
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# Sort processed_nodes by page index to find ranges.
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sorted_bookmarks = sorted(processed_nodes, key=lambda x: x[0])
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# Set of pages that are "bookmarks"
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bookmarked_pages = set(p for p, n in sorted_bookmarks)
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current_node = None
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# We need a way to look up bookmarks starting at p
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bookmarks_by_page = {}
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for p, node in processed_nodes:
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if p not in bookmarks_by_page:
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bookmarks_by_page[p] = []
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bookmarks_by_page[p].append(node)
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# Let's iterate.
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for page_num in range(len(self.pdf_doc)):
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page_id = f"page_{page_num + 1}"
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# Check if this page STARTS bookmarks
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if page_num in bookmarks_by_page:
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starts = bookmarks_by_page[page_num]
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current_node = starts[-1]
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continue
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# If page is NOT a bookmark, it's a "gap page".
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# Add as child to current_node
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title = self._get_page_title(page_num, self.content_texts.get(page_id, ""))
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page_node = {
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"title": title,
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"src": page_id,
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"children": [],
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"has_content": True
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}
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if current_node:
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current_node["children"].append(page_node)
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else:
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# No preceding bookmark. Add to root.
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root_children.append(page_node)
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return root_children
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class MarkdownParser(BaseBookParser):
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+7
-216
@@ -394,10 +394,7 @@ class HandlerDialog(QDialog):
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font.setBold(True)
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info_item.setFont(0, font)
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# TODO look into why we need this here and not just rely on logic in PDFParser
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if self.parser.file_type == "pdf":
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self._build_pdf_tree()
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elif self.processed_nav_structure:
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if self.processed_nav_structure:
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self._build_tree_from_nav(
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self.processed_nav_structure, self.treeWidget
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)
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@@ -471,200 +468,6 @@ class HandlerDialog(QDialog):
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self._build_tree_from_nav(children, item, seen_content_hashes)
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# TODO look into why we need this here and not just rely on logic in PDFParser
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def _build_pdf_tree(self):
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pdf_doc = getattr(self.parser, "pdf_doc", None)
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if not pdf_doc:
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return
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outline = pdf_doc.get_toc()
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self.has_pdf_bookmarks = bool(outline)
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self.bookmark_items_map = {}
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if not outline:
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self._build_pdf_pages_tree()
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return
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bookmark_pages = []
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page_to_bookmark = {}
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next_page_boundaries = {}
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added_pages = set()
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def extract_page_numbers(entries):
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for entry in entries:
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if len(entry) >= 3:
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_, title, page = entry[:3]
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page_num = (
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page - 1
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if isinstance(page, int)
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else pdf_doc.resolve_link(page)[0]
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)
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bookmark_pages.append((page_num, title))
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if len(entry) > 3 and isinstance(entry[3], list):
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extract_page_numbers(entry[3])
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extract_page_numbers(outline)
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bookmark_pages.sort()
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for i, (page_num, title) in enumerate(bookmark_pages):
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if i < len(bookmark_pages) - 1:
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next_page_boundaries[page_num] = bookmark_pages[i + 1][0]
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page_to_bookmark[page_num] = title
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def build_outline_tree(entries, parent_item):
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for entry in entries:
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if len(entry) >= 3:
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entry_level, title, page = entry[:3]
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page_num = (
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page - 1
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if isinstance(page, int)
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else pdf_doc.resolve_link(page)[0]
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)
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page_id = f"page_{page_num + 1}"
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# attach chapters on same page under original
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if page_num in self.bookmark_items_map:
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orig = self.bookmark_items_map[page_num]
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child = QTreeWidgetItem(orig, [f"{title} (Same page)"])
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child.setData(0, Qt.ItemDataRole.UserRole, page_id)
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child.setFlags(child.flags() & ~Qt.ItemFlag.ItemIsUserCheckable)
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continue
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bookmark_item = QTreeWidgetItem(parent_item, [title])
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bookmark_item.setData(0, Qt.ItemDataRole.UserRole, page_id)
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# only allow checking if this chapter has content
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if self.content_lengths.get(page_id, 0) > 0:
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bookmark_item.setFlags(
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bookmark_item.flags() | Qt.ItemFlag.ItemIsUserCheckable
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)
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bookmark_item.setCheckState(
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0,
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(
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Qt.CheckState.Checked
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if page_id in self.checked_chapters
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else Qt.CheckState.Unchecked
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),
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)
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else:
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bookmark_item.setFlags(
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bookmark_item.flags() & ~Qt.ItemFlag.ItemIsUserCheckable
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)
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# map for uncategorized pages
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self.bookmark_items_map[page_num] = bookmark_item
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added_pages.add(page_num)
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next_page = next_page_boundaries.get(page_num, len(pdf_doc))
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for sub_page_num in range(page_num + 1, next_page):
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if (
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sub_page_num in page_to_bookmark
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or sub_page_num in added_pages
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):
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continue
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page_id = f"page_{sub_page_num + 1}"
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page_title = f"Page {sub_page_num + 1}"
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page_text = self.content_texts.get(page_id, "").strip()
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if page_text:
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first_line = page_text.split("\n", 1)[0].strip()
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if first_line and len(first_line) < 100:
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page_title += f" - {first_line}"
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page_item = QTreeWidgetItem(bookmark_item, [page_title])
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page_item.setData(0, Qt.ItemDataRole.UserRole, page_id)
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# only allow checking if this sub-page has content
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if self.content_lengths.get(page_id, 0) > 0:
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page_item.setFlags(
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page_item.flags() | Qt.ItemFlag.ItemIsUserCheckable
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)
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page_item.setCheckState(
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0,
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(
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Qt.CheckState.Checked
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if page_id in self.checked_chapters
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else Qt.CheckState.Unchecked
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),
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)
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else:
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page_item.setFlags(
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page_item.flags() & ~Qt.ItemFlag.ItemIsUserCheckable
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)
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added_pages.add(sub_page_num)
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build_outline_tree(outline, self.treeWidget)
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covered_pages = set(added_pages)
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# attach any pages without direct bookmarks under nearest preceding chapter
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uncategorized_pages = [
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i for i in range(len(pdf_doc)) if i not in covered_pages
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]
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for page_num in uncategorized_pages:
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# find nearest previous bookmark
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prev_nums = [n for n in sorted(self.bookmark_items_map) if n < page_num]
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parent_item = (
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self.bookmark_items_map[prev_nums[-1]] if prev_nums else self.treeWidget
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)
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page_id = f"page_{page_num + 1}"
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title = f"Page {page_num + 1}"
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text = self.content_texts.get(page_id, "").strip()
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if text:
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first = text.split("\n", 1)[0].strip()
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if first and len(first) < 100:
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title += f" - {first}"
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page_item = QTreeWidgetItem(parent_item, [title])
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page_item.setData(0, Qt.ItemDataRole.UserRole, page_id)
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# only allow checking if uncategorized page has content
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if self.content_lengths.get(page_id, 0) > 0:
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page_item.setFlags(page_item.flags() | Qt.ItemFlag.ItemIsUserCheckable)
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page_item.setCheckState(
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0,
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(
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Qt.CheckState.Checked
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if page_id in self.checked_chapters
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else Qt.CheckState.Unchecked
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),
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)
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else:
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page_item.setFlags(page_item.flags() & ~Qt.ItemFlag.ItemIsUserCheckable)
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def _build_pdf_pages_tree(self):
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pdf_doc = getattr(self.parser, "pdf_doc", None)
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if not pdf_doc:
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return
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pages_item = QTreeWidgetItem(self.treeWidget, ["Pages"])
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pages_item.setFlags(pages_item.flags() & ~Qt.ItemFlag.ItemIsUserCheckable)
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font = pages_item.font(0)
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font.setBold(True)
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pages_item.setFont(0, font)
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for page_num in range(len(pdf_doc)):
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page_id = f"page_{page_num + 1}"
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page_title = f"Page {page_num + 1}"
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page_text = self.content_texts.get(page_id, "").strip()
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if page_text:
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first_line = page_text.split("\n", 1)[0].strip()
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if first_line and len(first_line) < 100:
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page_title += f" - {first_line}"
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page_item = QTreeWidgetItem(pages_item, [page_title])
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page_item.setData(0, Qt.ItemDataRole.UserRole, page_id)
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# only allow checking if standalone page has content
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if self.content_lengths.get(page_id, 0) > 0:
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page_item.setFlags(page_item.flags() | Qt.ItemFlag.ItemIsUserCheckable)
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page_item.setCheckState(
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0,
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(
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Qt.CheckState.Checked
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if page_id in self.checked_chapters
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else Qt.CheckState.Unchecked
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),
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)
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else:
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page_item.setFlags(page_item.flags() & ~Qt.ItemFlag.ItemIsUserCheckable)
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def _are_provided_checks_relevant(self):
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if not self.checked_chapters:
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return False
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@@ -989,15 +792,6 @@ class HandlerDialog(QDialog):
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iterator += 1
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def _run_pdf_auto_check(self):
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if hasattr(self, "has_pdf_bookmarks") and not self.has_pdf_bookmarks:
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iterator = QTreeWidgetItemIterator(self.treeWidget)
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while iterator.value():
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item = iterator.value()
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if item.flags() & Qt.ItemFlag.ItemIsUserCheckable:
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item.setCheckState(0, Qt.CheckState.Checked)
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iterator += 1
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return
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iterator = QTreeWidgetItemIterator(self.treeWidget)
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while iterator.value():
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item = iterator.value()
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@@ -1006,16 +800,13 @@ class HandlerDialog(QDialog):
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continue
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identifier = item.data(0, Qt.ItemDataRole.UserRole)
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if not identifier:
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iterator += 1
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continue
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if (
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not identifier.startswith("page_")
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or self.content_lengths.get(identifier, 0) > 0
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):
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item.setCheckState(0, Qt.CheckState.Checked)
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iterator += 1
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continue
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# Logic: Check item if it has content (already handled by ItemIsUserCheckable flag really)
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# But duplicate logic from previous implementation:
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item.setCheckState(0, Qt.CheckState.Checked)
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iterator += 1
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