fix: Run docling processing in subprocess (#9541)

* fix: Run docling processing in subprocess

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* Update file.py

* [autofix.ci] apply automated fixes

* Update file.py

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* Update file.py

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Carlos Coelho <80289056+carlosrcoelho@users.noreply.github.com>
This commit is contained in:
Eric Hare 2025-08-26 19:32:13 -07:00 committed by GitHub
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5 changed files with 312 additions and 386 deletions

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@ -1,9 +1,21 @@
"""Enhanced file component v2 with mypy and ruff compliance."""
"""Enhanced file component with clearer structure and Docling isolation.
Notes:
-----
- Functionality is preserved with minimal behavioral changes.
- ALL Docling parsing/export runs in a separate OS process to prevent memory
growth and native library state from impacting the main Langflow process.
- Standard text/structured parsing continues to use existing BaseFileComponent
utilities (and optional threading via `parallel_load_data`).
"""
from __future__ import annotations
import json
import subprocess
import sys
import textwrap
from copy import deepcopy
from enum import Enum
from typing import TYPE_CHECKING, Any
from langflow.base.data.base_file import BaseFileComponent
@ -24,51 +36,8 @@ if TYPE_CHECKING:
from langflow.schema import DataFrame
class MockConversionStatus(Enum):
"""Mock ConversionStatus for fallback compatibility."""
SUCCESS = "success"
FAILURE = "failure"
class MockInputFormat(Enum):
"""Mock InputFormat for fallback compatibility."""
PDF = "pdf"
IMAGE = "image"
class MockImageRefMode(Enum):
"""Mock ImageRefMode for fallback compatibility."""
PLACEHOLDER = "placeholder"
EMBEDDED = "embedded"
class DoclingImports:
"""Container for docling imports with type information."""
def __init__(
self,
conversion_status: type[Enum],
input_format: type[Enum],
document_converter: type,
image_ref_mode: type[Enum],
strategy: str,
) -> None:
self.conversion_status = conversion_status
self.input_format = input_format
self.document_converter = document_converter
self.image_ref_mode = image_ref_mode
self.strategy = strategy
class FileComponent(BaseFileComponent):
"""Enhanced file component v2 that combines standard file loading with optional Docling processing and export.
This component supports all features of the standard File component, plus an advanced mode
that enables Docling document processing and export to various formats (Markdown, HTML, etc.).
"""
"""File component with optional Docling processing (isolated in a subprocess)."""
display_name = "File"
description = "Loads content from files with optional advanced document processing and export using Docling."
@ -76,7 +45,7 @@ class FileComponent(BaseFileComponent):
icon = "file-text"
name = "File"
# Docling supported formats from original component
# Docling-supported/compatible extensions; TEXT_FILE_TYPES are supported by the base loader.
VALID_EXTENSIONS = [
"adoc",
"asciidoc",
@ -110,12 +79,12 @@ class FileComponent(BaseFileComponent):
*TEXT_FILE_TYPES,
]
# Fixed export settings
# Fixed export settings used when markdown export is requested.
EXPORT_FORMAT = "Markdown"
IMAGE_MODE = "placeholder"
# ---- Inputs / Outputs (kept as close to original as possible) -------------------
_base_inputs = deepcopy(BaseFileComponent._base_inputs)
for input_item in _base_inputs:
if isinstance(input_item, FileInput) and input_item.name == "path":
input_item.real_time_refresh = True
@ -175,6 +144,7 @@ class FileComponent(BaseFileComponent):
advanced=True,
show=False,
),
# Deprecated input retained for backward-compatibility.
BoolInput(
name="use_multithreading",
display_name="[Deprecated] Use Multithreading",
@ -202,8 +172,10 @@ class FileComponent(BaseFileComponent):
Output(display_name="Raw Content", name="message", method="load_files_message"),
]
def _path_value(self, template) -> list[str]:
# Get current path value
# ------------------------------ UI helpers --------------------------------------
def _path_value(self, template: dict) -> list[str]:
"""Return the list of currently selected file paths from the template."""
return template.get("path", {}).get("file_path", [])
def update_build_config(
@ -212,65 +184,41 @@ class FileComponent(BaseFileComponent):
field_value: Any,
field_name: str | None = None,
) -> dict[str, Any]:
"""Update build configuration to show/hide fields based on file count and advanced_mode."""
"""Show/hide Advanced Parser and related fields based on selection context."""
if field_name == "path":
# Get current path value
path_value = self._path_value(build_config)
file_path = path_value[0] if len(path_value) > 0 else ""
# Show/hide Advanced Parser based on file count (only for single files)
paths = self._path_value(build_config)
file_path = paths[0] if paths else ""
file_count = len(field_value) if field_value else 0
if file_count == 1 and not file_path.endswith((".csv", ".xlsx", ".parquet")):
build_config["advanced_mode"]["show"] = True
else:
build_config["advanced_mode"]["show"] = False
build_config["advanced_mode"]["value"] = False # Reset to False when hidden
# Hide all advanced fields when Advanced Parser is not available
advanced_fields = [
"pipeline",
"ocr_engine",
"doc_key",
"md_image_placeholder",
"md_page_break_placeholder",
]
for field in advanced_fields:
if field in build_config:
build_config[field]["show"] = False
# Advanced mode only for single (non-tabular) file
allow_advanced = file_count == 1 and not file_path.endswith((".csv", ".xlsx", ".parquet"))
build_config["advanced_mode"]["show"] = allow_advanced
if not allow_advanced:
build_config["advanced_mode"]["value"] = False
for f in ("pipeline", "ocr_engine", "doc_key", "md_image_placeholder", "md_page_break_placeholder"):
if f in build_config:
build_config[f]["show"] = False
elif field_name == "advanced_mode":
# Show/hide advanced fields based on advanced_mode (only if single file)
advanced_fields = [
"pipeline",
"ocr_engine",
"doc_key",
"md_image_placeholder",
"md_page_break_placeholder",
]
for field in advanced_fields:
if field in build_config:
build_config[field]["show"] = field_value
for f in ("pipeline", "ocr_engine", "doc_key", "md_image_placeholder", "md_page_break_placeholder"):
if f in build_config:
build_config[f]["show"] = bool(field_value)
return build_config
def update_outputs(self, frontend_node: dict[str, Any], field_name: str, field_value: Any) -> dict[str, Any]: # noqa: ARG002
"""Dynamically show outputs based on the number of files and their types."""
"""Dynamically show outputs based on file count/type and advanced mode."""
if field_name not in ["path", "advanced_mode"]:
return frontend_node
# Add outputs based on the number of files in the path
template = frontend_node.get("template", {})
path_value = self._path_value(template)
if len(path_value) == 0:
paths = self._path_value(template)
if not paths:
return frontend_node
# Clear existing outputs
frontend_node["outputs"] = []
if len(path_value) == 1:
# We need to check if the file is structured content
file_path = path_value[0] if field_name == "path" else frontend_node["template"]["path"]["file_path"][0]
if len(paths) == 1:
file_path = paths[0] if field_name == "path" else frontend_node["template"]["path"]["file_path"][0]
if file_path.endswith((".csv", ".xlsx", ".parquet")):
frontend_node["outputs"].append(
Output(display_name="Structured Content", name="dataframe", method="load_files_structured"),
@ -280,11 +228,8 @@ class FileComponent(BaseFileComponent):
Output(display_name="Structured Content", name="json", method="load_files_json"),
)
# Add outputs based on advanced mode
advanced_mode = frontend_node.get("template", {}).get("advanced_mode", {}).get("value", False)
if advanced_mode:
# Advanced mode: Structured Output, Markdown, and File Path
frontend_node["outputs"].append(
Output(display_name="Structured Output", name="advanced", method="load_files_advanced"),
)
@ -295,7 +240,6 @@ class FileComponent(BaseFileComponent):
Output(display_name="File Path", name="path", method="load_files_path"),
)
else:
# Normal mode: Raw Content and File Path
frontend_node["outputs"].append(
Output(display_name="Raw Content", name="message", method="load_files_message"),
)
@ -303,130 +247,16 @@ class FileComponent(BaseFileComponent):
Output(display_name="File Path", name="path", method="load_files_path"),
)
else:
# For multiple files, we show the files output (DataFrame format)
# Advanced Parser is not available for multiple files
frontend_node["outputs"].append(
Output(display_name="Files", name="dataframe", method="load_files"),
)
# Multiple files => DataFrame output; advanced parser disabled
frontend_node["outputs"].append(Output(display_name="Files", name="dataframe", method="load_files"))
return frontend_node
def _try_import_docling(self) -> DoclingImports | None:
"""Try different import strategies for docling components."""
# Try strategy 1: Latest docling structure
try:
from docling.datamodel.base_models import ConversionStatus, InputFormat # type: ignore[import-untyped]
from docling.document_converter import DocumentConverter # type: ignore[import-untyped]
from docling_core.types.doc import ImageRefMode # type: ignore[import-untyped]
self.log("Using latest docling import structure")
return DoclingImports(
conversion_status=ConversionStatus,
input_format=InputFormat,
document_converter=DocumentConverter,
image_ref_mode=ImageRefMode,
strategy="latest",
)
except ImportError as e:
self.log(f"Latest docling structure failed: {e}")
# Try strategy 2: Alternative import paths
try:
from docling.document_converter import DocumentConverter # type: ignore[import-untyped]
from docling_core.types.doc import ImageRefMode # type: ignore[import-untyped]
# Try to get ConversionStatus from different locations
conversion_status: type[Enum] = MockConversionStatus
input_format: type[Enum] = MockInputFormat
try:
from docling_core.types import ConversionStatus, InputFormat # type: ignore[import-untyped]
conversion_status = ConversionStatus
input_format = InputFormat
except ImportError:
try:
from docling.datamodel import ConversionStatus, InputFormat # type: ignore[import-untyped]
conversion_status = ConversionStatus
input_format = InputFormat
except ImportError:
# Use mock enums if we can't find them
pass
self.log("Using alternative docling import structure")
return DoclingImports(
conversion_status=conversion_status,
input_format=input_format,
document_converter=DocumentConverter,
image_ref_mode=ImageRefMode,
strategy="alternative",
)
except ImportError as e:
self.log(f"Alternative docling structure failed: {e}")
# Try strategy 3: Basic converter only
try:
from docling.document_converter import DocumentConverter # type: ignore[import-untyped]
self.log("Using basic docling import structure with mocks")
return DoclingImports(
conversion_status=MockConversionStatus,
input_format=MockInputFormat,
document_converter=DocumentConverter,
image_ref_mode=MockImageRefMode,
strategy="basic",
)
except ImportError as e:
self.log(f"Basic docling structure failed: {e}")
# Strategy 4: Complete fallback - return None to indicate failure
return None
def _create_advanced_converter(self, docling_imports: DoclingImports) -> Any:
"""Create advanced converter with pipeline options if available."""
try:
from docling.datamodel.pipeline_options import PdfPipelineOptions # type: ignore[import-untyped]
from docling.document_converter import PdfFormatOption # type: ignore[import-untyped]
document_converter = docling_imports.document_converter
input_format = docling_imports.input_format
# Create basic pipeline options
pipeline_options = PdfPipelineOptions()
# Configure OCR if specified and available
if self.ocr_engine:
try:
from docling.models.factories import get_ocr_factory # type: ignore[import-untyped]
pipeline_options.do_ocr = True
ocr_factory = get_ocr_factory(allow_external_plugins=False)
ocr_options = ocr_factory.create_options(kind=self.ocr_engine)
pipeline_options.ocr_options = ocr_options
self.log(f"Configured OCR with engine: {self.ocr_engine}")
except Exception as e: # noqa: BLE001
self.log(f"Could not configure OCR: {e}, proceeding without OCR")
pipeline_options.do_ocr = False
# Create format options
pdf_format_option = PdfFormatOption(pipeline_options=pipeline_options)
format_options = {}
if hasattr(input_format, "PDF"):
format_options[input_format.PDF] = pdf_format_option
if hasattr(input_format, "IMAGE"):
format_options[input_format.IMAGE] = pdf_format_option
return document_converter(format_options=format_options)
except Exception as e: # noqa: BLE001
self.log(f"Could not create advanced converter: {e}, using basic converter")
return docling_imports.document_converter()
# ------------------------------ Core processing ----------------------------------
def _is_docling_compatible(self, file_path: str) -> bool:
"""Check if file is compatible with Docling processing."""
# All VALID_EXTENSIONS are Docling compatible (except for TEXT_FILE_TYPES which may overlap)
docling_extensions = [
"""Lightweight extension gate for Docling-compatible types."""
docling_exts = (
".adoc",
".asciidoc",
".asc",
@ -456,102 +286,296 @@ class FileComponent(BaseFileComponent):
".xhtml",
".xml",
".webp",
]
return any(file_path.lower().endswith(ext) for ext in docling_extensions)
)
return file_path.lower().endswith(docling_exts)
def _process_docling_in_subprocess(self, file_path: str) -> Data | None:
"""Run Docling in a separate OS process and map the result to a Data object.
We avoid multiprocessing pickling by launching `python -c "<script>"` and
passing JSON config via stdin. The child prints a JSON result to stdout.
"""
if not file_path:
return None
args: dict[str, Any] = {
"file_path": file_path,
"markdown": bool(self.markdown),
"image_mode": str(self.IMAGE_MODE),
"md_image_placeholder": str(self.md_image_placeholder),
"md_page_break_placeholder": str(self.md_page_break_placeholder),
"pipeline": str(self.pipeline),
"ocr_engine": str(self.ocr_engine) if getattr(self, "ocr_engine", "") else None,
}
# The child is a tiny, self-contained script to keep memory/state isolated.
child_script = textwrap.dedent(
r"""
import json, sys
def try_imports():
# Strategy 1: latest layout
try:
from docling.datamodel.base_models import ConversionStatus, InputFormat # type: ignore
from docling.document_converter import DocumentConverter # type: ignore
from docling_core.types.doc import ImageRefMode # type: ignore
return ConversionStatus, InputFormat, DocumentConverter, ImageRefMode, "latest"
except Exception:
pass
# Strategy 2: alternative layout
try:
from docling.document_converter import DocumentConverter # type: ignore
try:
from docling_core.types import ConversionStatus, InputFormat # type: ignore
except Exception:
try:
from docling.datamodel import ConversionStatus, InputFormat # type: ignore
except Exception:
class ConversionStatus: SUCCESS = "success"
class InputFormat:
PDF="pdf"; IMAGE="image"
try:
from docling_core.types.doc import ImageRefMode # type: ignore
except Exception:
class ImageRefMode:
PLACEHOLDER="placeholder"; EMBEDDED="embedded"
return ConversionStatus, InputFormat, DocumentConverter, ImageRefMode, "alternative"
except Exception:
pass
# Strategy 3: basic converter only
try:
from docling.document_converter import DocumentConverter # type: ignore
class ConversionStatus: SUCCESS = "success"
class InputFormat:
PDF="pdf"; IMAGE="image"
class ImageRefMode:
PLACEHOLDER="placeholder"; EMBEDDED="embedded"
return ConversionStatus, InputFormat, DocumentConverter, ImageRefMode, "basic"
except Exception as e:
raise ImportError(f"Docling imports failed: {e}") from e
def create_converter(strategy, input_format, DocumentConverter, pipeline, ocr_engine):
if strategy == "latest" and pipeline == "standard":
try:
from docling.datamodel.pipeline_options import PdfPipelineOptions # type: ignore
from docling.document_converter import PdfFormatOption # type: ignore
pipe = PdfPipelineOptions()
if ocr_engine:
try:
from docling.models.factories import get_ocr_factory # type: ignore
pipe.do_ocr = True
fac = get_ocr_factory(allow_external_plugins=False)
pipe.ocr_options = fac.create_options(kind=ocr_engine)
except Exception:
pipe.do_ocr = False
fmt = {}
if hasattr(input_format, "PDF"):
fmt[getattr(input_format, "PDF")] = PdfFormatOption(pipeline_options=pipe)
if hasattr(input_format, "IMAGE"):
fmt[getattr(input_format, "IMAGE")] = PdfFormatOption(pipeline_options=pipe)
return DocumentConverter(format_options=fmt)
except Exception:
return DocumentConverter()
return DocumentConverter()
def export_markdown(document, ImageRefMode, image_mode, img_ph, pg_ph):
try:
mode = getattr(ImageRefMode, image_mode.upper(), image_mode)
return document.export_to_markdown(
image_mode=mode,
image_placeholder=img_ph,
page_break_placeholder=pg_ph,
)
except Exception:
try:
return document.export_to_text()
except Exception:
return str(document)
def to_rows(doc_dict):
rows = []
for t in doc_dict.get("texts", []):
prov = t.get("prov") or []
page_no = None
if prov and isinstance(prov, list) and isinstance(prov[0], dict):
page_no = prov[0].get("page_no")
rows.append({
"page_no": page_no,
"label": t.get("label"),
"text": t.get("text"),
"level": t.get("level"),
})
return rows
def main():
cfg = json.loads(sys.stdin.read())
file_path = cfg["file_path"]
markdown = cfg["markdown"]
image_mode = cfg["image_mode"]
img_ph = cfg["md_image_placeholder"]
pg_ph = cfg["md_page_break_placeholder"]
pipeline = cfg["pipeline"]
ocr_engine = cfg.get("ocr_engine")
meta = {"file_path": file_path}
try:
ConversionStatus, InputFormat, DocumentConverter, ImageRefMode, strategy = try_imports()
converter = create_converter(strategy, InputFormat, DocumentConverter, pipeline, ocr_engine)
try:
res = converter.convert(file_path)
except Exception as e:
print(json.dumps({"ok": False, "error": f"Docling conversion error: {e}", "meta": meta}))
return
ok = False
if hasattr(res, "status"):
try:
ok = (res.status == ConversionStatus.SUCCESS) or (str(res.status).lower() == "success")
except Exception:
ok = (str(res.status).lower() == "success")
if not ok and hasattr(res, "document"):
ok = getattr(res, "document", None) is not None
if not ok:
print(json.dumps({"ok": False, "error": "Docling conversion failed", "meta": meta}))
return
doc = getattr(res, "document", None)
if doc is None:
print(json.dumps({"ok": False, "error": "Docling produced no document", "meta": meta}))
return
if markdown:
text = export_markdown(doc, ImageRefMode, image_mode, img_ph, pg_ph)
print(json.dumps({"ok": True, "mode": "markdown", "text": text, "meta": meta}))
return
# structured
try:
doc_dict = doc.export_to_dict()
except Exception as e:
print(json.dumps({"ok": False, "error": f"Docling export_to_dict failed: {e}", "meta": meta}))
return
rows = to_rows(doc_dict)
print(json.dumps({"ok": True, "mode": "structured", "doc": rows, "meta": meta}))
except Exception as e:
print(
json.dumps({
"ok": False,
"error": f"Docling processing error: {e}",
"meta": {"file_path": file_path},
})
)
if __name__ == "__main__":
main()
"""
)
# Validate file_path to avoid command injection or unsafe input
if not isinstance(args["file_path"], str) or any(c in args["file_path"] for c in [";", "|", "&", "$", "`"]):
return Data(data={"error": "Unsafe file path detected.", "file_path": args["file_path"]})
proc = subprocess.run( # noqa: S603
[sys.executable, "-u", "-c", child_script],
input=json.dumps(args).encode("utf-8"),
capture_output=True,
check=False,
)
if not proc.stdout:
err_msg = proc.stderr.decode("utf-8", errors="replace") or "no output from child process"
return Data(data={"error": f"Docling subprocess error: {err_msg}", "file_path": file_path})
try:
result = json.loads(proc.stdout.decode("utf-8"))
except Exception as e: # noqa: BLE001
err_msg = proc.stderr.decode("utf-8", errors="replace")
return Data(
data={"error": f"Invalid JSON from Docling subprocess: {e}. stderr={err_msg}", "file_path": file_path},
)
if not result.get("ok"):
return Data(data={"error": result.get("error", "Unknown Docling error"), **result.get("meta", {})})
meta = result.get("meta", {})
if result.get("mode") == "markdown":
exported_content = str(result.get("text", ""))
return Data(
text=exported_content,
data={"exported_content": exported_content, "export_format": self.EXPORT_FORMAT, **meta},
)
rows = list(result.get("doc", []))
return Data(data={"doc": rows, "export_format": self.EXPORT_FORMAT, **meta})
def process_files(
self,
file_list: list[BaseFileComponent.BaseFile],
) -> list[BaseFileComponent.BaseFile]:
"""Process files using standard parsing or Docling based on advanced_mode and file type."""
def process_file_standard(file_path: str, *, silent_errors: bool = False) -> Data | None:
"""Process a single file using standard text parsing."""
try:
return parse_text_file_to_data(file_path, silent_errors=silent_errors)
except FileNotFoundError as e:
msg = f"File not found: {file_path}. Error: {e}"
self.log(msg)
if not silent_errors:
raise
return None
except Exception as e:
msg = f"Unexpected error processing {file_path}: {e}"
self.log(msg)
if not silent_errors:
raise
return None
def process_file_docling(file_path: str, *, silent_errors: bool = False) -> Data | None:
"""Process a single file using Docling if compatible, otherwise standard processing."""
# Try Docling first if file is compatible and advanced mode is enabled
try:
return self._process_with_docling_and_export(file_path)
except Exception as e: # noqa: BLE001
self.log(f"Docling processing failed for {file_path}: {e}, falling back to standard processing")
if not silent_errors:
# Return error data instead of raising
return Data(data={"error": f"Docling processing failed: {e}", "file_path": file_path})
return None
"""Process input files.
- Single file + advanced_mode => Docling in a separate process.
- Otherwise => standard parsing in current process (optionally threaded).
"""
if not file_list:
msg = "No files to process."
raise ValueError(msg)
file_path = str(file_list[0].path)
if self.advanced_mode and self._is_docling_compatible(file_path):
processed_data = process_file_docling(file_path)
if not processed_data:
msg = f"Failed to process file with Docling: {file_path}"
raise ValueError(msg)
# Serialize processed data to match Data structure
serialized_data = processed_data.serialize_model()
# Now, if doc is nested, we need to unravel it
clean_data: list[Data | None] = [processed_data]
# This is where we've manually processed the data
def process_file_standard(file_path: str, *, silent_errors: bool = False) -> Data | None:
try:
if "exported_content" not in serialized_data:
clean_data = [
return parse_text_file_to_data(file_path, silent_errors=silent_errors)
except FileNotFoundError as e:
self.log(f"File not found: {file_path}. Error: {e}")
if not silent_errors:
raise
return None
except Exception as e:
self.log(f"Unexpected error processing {file_path}: {e}")
if not silent_errors:
raise
return None
# Advanced path: only for a single Docling-compatible file
if len(file_list) == 1:
file_path = str(file_list[0].path)
if self.advanced_mode and self._is_docling_compatible(file_path):
advanced_data: Data | None = self._process_docling_in_subprocess(file_path)
# --- UNNEST: expand each element in `doc` to its own Data row
payload = getattr(advanced_data, "data", {}) or {}
doc_rows = payload.get("doc")
if isinstance(doc_rows, list):
rows: list[Data | None] = [
Data(
data={
"file_path": file_path,
**(
item["element"]
if "element" in item
else {k: v for k, v in item.items() if k != "file_path"}
),
}
**(item if isinstance(item, dict) else {"value": item}),
},
)
for item in serialized_data["doc"]
for item in doc_rows
]
except Exception as _: # noqa: BLE001
raise ValueError(serialized_data) from None
return self.rollup_data(file_list, rows)
# Repeat file_list to match the number of processed data elements
final_data: list[Data | None] = clean_data
return self.rollup_data(file_list, final_data)
# If not structured, keep as-is (e.g., markdown export or error dict)
return self.rollup_data(file_list, [advanced_data])
# Standard multi-file (or single non-advanced) path
concurrency = 1 if not self.use_multithreading else max(1, self.concurrency_multithreading)
file_count = len(file_list)
self.log(f"Starting parallel processing of {file_count} files with concurrency: {concurrency}.")
file_paths = [str(file.path) for file in file_list]
file_paths = [str(f.path) for f in file_list]
self.log(f"Starting parallel processing of {len(file_paths)} files with concurrency: {concurrency}.")
my_data = parallel_load_data(
file_paths,
silent_errors=self.silent_errors,
load_function=process_file_standard,
max_concurrency=concurrency,
)
return self.rollup_data(file_list, my_data)
# ------------------------------ Output helpers -----------------------------------
def load_files_advanced(self) -> DataFrame:
"""Load files using advanced Docling processing and export to an advanced format."""
# TODO: Update
self.markdown = False
return self.load_files()
@ -560,101 +584,3 @@ class FileComponent(BaseFileComponent):
self.markdown = True
result = self.load_files()
return Message(text=str(result.text[0]))
def _process_with_docling_and_export(self, file_path: str) -> Data:
"""Process a single file with Docling and export to the specified format."""
# Import docling components only when needed
docling_imports = self._try_import_docling()
if docling_imports is None:
msg = "Docling not available for advanced processing"
raise ImportError(msg)
conversion_status = docling_imports.conversion_status
document_converter = docling_imports.document_converter
image_ref_mode = docling_imports.image_ref_mode
try:
# Create converter based on strategy and pipeline setting
if docling_imports.strategy == "latest" and self.pipeline == "standard":
converter = self._create_advanced_converter(docling_imports)
else:
# Use basic converter for compatibility
converter = document_converter()
self.log("Using basic DocumentConverter for Docling processing")
# Process single file
result = converter.convert(file_path)
# Check if conversion was successful
success = False
if hasattr(result, "status"):
if hasattr(conversion_status, "SUCCESS"):
success = result.status == conversion_status.SUCCESS
else:
success = str(result.status).lower() == "success"
elif hasattr(result, "document"):
# If no status but has document, assume success
success = result.document is not None
if not success:
return Data(data={"error": "Docling conversion failed", "file_path": file_path})
if self.markdown:
self.log("Exporting document to Markdown format")
# Export the document to the specified format
exported_content = self._export_document(result.document, image_ref_mode)
return Data(
text=exported_content,
data={
"exported_content": exported_content,
"export_format": self.EXPORT_FORMAT,
"file_path": file_path,
},
)
return Data(
data={
"doc": self.docling_to_dataframe_simple(result.document.export_to_dict()),
"export_format": self.EXPORT_FORMAT,
"file_path": file_path,
}
)
except Exception as e: # noqa: BLE001
return Data(data={"error": f"Docling processing error: {e!s}", "file_path": file_path})
def docling_to_dataframe_simple(self, doc):
"""Extract all text elements into a simple DataFrame."""
return [
{
"page_no": text["prov"][0]["page_no"] if text["prov"] else None,
"label": text["label"],
"text": text["text"],
"level": text.get("level", None), # for headers
}
for text in doc["texts"]
]
def _export_document(self, document: Any, image_ref_mode: type[Enum]) -> str:
"""Export document to Markdown format with placeholder images."""
try:
image_mode = (
image_ref_mode(self.IMAGE_MODE) if hasattr(image_ref_mode, self.IMAGE_MODE) else self.IMAGE_MODE
)
# Always export to Markdown since it's fixed
return document.export_to_markdown(
image_mode=image_mode,
image_placeholder=self.md_image_placeholder,
page_break_placeholder=self.md_page_break_placeholder,
)
except Exception as e: # noqa: BLE001
self.log(f"Markdown export failed: {e}, using basic text export")
# Fallback to basic text export
try:
return document.export_to_text()
except Exception: # noqa: BLE001
return str(document)

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