#!/Users/surbhisharma/Medical_RAG/myenv/bin/python3
"""Extract pdf structure in XML format"""
import logging
import os.path
import re
import sys
from typing import Any, Container, Dict, Iterable, List, Optional, TextIO, Union, cast
from argparse import ArgumentParser
import pdfminer
from pdfminer.pdfdocument import PDFDocument, PDFNoOutlines, PDFXRefFallback
from pdfminer.pdfpage import PDFPage
from pdfminer.pdfparser import PDFParser
from pdfminer.pdftypes import PDFObjectNotFound, PDFValueError
from pdfminer.pdftypes import PDFStream, PDFObjRef, resolve1, stream_value
from pdfminer.psparser import PSKeyword, PSLiteral, LIT
from pdfminer.utils import isnumber
logging.basicConfig()
logger = logging.getLogger(__name__)
ESC_PAT = re.compile(r'[\000-\037&<>()"\042\047\134\177-\377]')
def escape(s: Union[str, bytes]) -> str:
if isinstance(s, bytes):
us = str(s, "latin-1")
else:
us = s
return ESC_PAT.sub(lambda m: "%d;" % ord(m.group(0)), us)
def dumpxml(out: TextIO, obj: object, codec: Optional[str] = None) -> None:
if obj is None:
out.write("")
return
if isinstance(obj, dict):
out.write('\n' % len(obj))
for (k, v) in obj.items():
out.write("%s\n" % k)
out.write("")
dumpxml(out, v)
out.write("\n")
out.write("")
return
if isinstance(obj, list):
out.write('\n' % len(obj))
for v in obj:
dumpxml(out, v)
out.write("\n")
out.write("
")
return
if isinstance(obj, (str, bytes)):
out.write('%s' % (len(obj), escape(obj)))
return
if isinstance(obj, PDFStream):
if codec == "raw":
# Bug: writing bytes to text I/O. This will raise TypeError.
out.write(obj.get_rawdata()) # type: ignore [arg-type]
elif codec == "binary":
# Bug: writing bytes to text I/O. This will raise TypeError.
out.write(obj.get_data()) # type: ignore [arg-type]
else:
out.write("\n\n")
dumpxml(out, obj.attrs)
out.write("\n\n")
if codec == "text":
data = obj.get_data()
out.write('%s\n' % (len(data), escape(data)))
out.write("")
return
if isinstance(obj, PDFObjRef):
out.write('' % obj.objid)
return
if isinstance(obj, PSKeyword):
# Likely bug: obj.name is bytes, not str
out.write("%s" % obj.name) # type: ignore [str-bytes-safe]
return
if isinstance(obj, PSLiteral):
# Likely bug: obj.name may be bytes, not str
out.write("%s" % obj.name) # type: ignore [str-bytes-safe]
return
if isnumber(obj):
out.write("%s" % obj)
return
raise TypeError(obj)
def dumptrailers(
out: TextIO, doc: PDFDocument, show_fallback_xref: bool = False
) -> None:
for xref in doc.xrefs:
if not isinstance(xref, PDFXRefFallback) or show_fallback_xref:
out.write("\n")
dumpxml(out, xref.get_trailer())
out.write("\n\n\n")
no_xrefs = all(isinstance(xref, PDFXRefFallback) for xref in doc.xrefs)
if no_xrefs and not show_fallback_xref:
msg = (
"This PDF does not have an xref. Use --show-fallback-xref if "
"you want to display the content of a fallback xref that "
"contains all objects."
)
logger.warning(msg)
return
def dumpallobjs(
out: TextIO,
doc: PDFDocument,
codec: Optional[str] = None,
show_fallback_xref: bool = False,
) -> None:
visited = set()
out.write("")
for xref in doc.xrefs:
for objid in xref.get_objids():
if objid in visited:
continue
visited.add(objid)
try:
obj = doc.getobj(objid)
if obj is None:
continue
out.write('\n\n")
except PDFObjectNotFound as e:
print("not found: %r" % e)
dumptrailers(out, doc, show_fallback_xref)
out.write("")
return
def dumpoutline(
outfp: TextIO,
fname: str,
objids: Any,
pagenos: Container[int],
password: str = "",
dumpall: bool = False,
codec: Optional[str] = None,
extractdir: Optional[str] = None,
) -> None:
fp = open(fname, "rb")
parser = PDFParser(fp)
doc = PDFDocument(parser, password)
pages = {
page.pageid: pageno
for (pageno, page) in enumerate(PDFPage.create_pages(doc), 1)
}
def resolve_dest(dest: object) -> Any:
if isinstance(dest, (str, bytes)):
dest = resolve1(doc.get_dest(dest))
elif isinstance(dest, PSLiteral):
dest = resolve1(doc.get_dest(dest.name))
if isinstance(dest, dict):
dest = dest["D"]
if isinstance(dest, PDFObjRef):
dest = dest.resolve()
return dest
try:
outlines = doc.get_outlines()
outfp.write("\n")
for (level, title, dest, a, se) in outlines:
pageno = None
if dest:
dest = resolve_dest(dest)
pageno = pages[dest[0].objid]
elif a:
action = a
if isinstance(action, dict):
subtype = action.get("S")
if subtype and repr(subtype) == "/'GoTo'" and action.get("D"):
dest = resolve_dest(action["D"])
pageno = pages[dest[0].objid]
s = escape(title)
outfp.write('\n'.format(level, s))
if dest is not None:
outfp.write("")
dumpxml(outfp, dest)
outfp.write("\n")
if pageno is not None:
outfp.write("%r\n" % pageno)
outfp.write("\n")
outfp.write("\n")
except PDFNoOutlines:
pass
parser.close()
fp.close()
return
LITERAL_FILESPEC = LIT("Filespec")
LITERAL_EMBEDDEDFILE = LIT("EmbeddedFile")
def extractembedded(fname: str, password: str, extractdir: str) -> None:
def extract1(objid: int, obj: Dict[str, Any]) -> None:
filename = os.path.basename(obj.get("UF") or cast(bytes, obj.get("F")).decode())
fileref = obj["EF"].get("UF") or obj["EF"].get("F")
fileobj = doc.getobj(fileref.objid)
if not isinstance(fileobj, PDFStream):
error_msg = (
"unable to process PDF: reference for %r is not a "
"PDFStream" % filename
)
raise PDFValueError(error_msg)
if fileobj.get("Type") is not LITERAL_EMBEDDEDFILE:
raise PDFValueError(
"unable to process PDF: reference for %r "
"is not an EmbeddedFile" % (filename)
)
path = os.path.join(extractdir, "%.6d-%s" % (objid, filename))
if os.path.exists(path):
raise IOError("file exists: %r" % path)
print("extracting: %r" % path)
os.makedirs(os.path.dirname(path), exist_ok=True)
out = open(path, "wb")
out.write(fileobj.get_data())
out.close()
return
with open(fname, "rb") as fp:
parser = PDFParser(fp)
doc = PDFDocument(parser, password)
extracted_objids = set()
for xref in doc.xrefs:
for objid in xref.get_objids():
obj = doc.getobj(objid)
if (
objid not in extracted_objids
and isinstance(obj, dict)
and obj.get("Type") is LITERAL_FILESPEC
):
extracted_objids.add(objid)
extract1(objid, obj)
return
def dumppdf(
outfp: TextIO,
fname: str,
objids: Iterable[int],
pagenos: Container[int],
password: str = "",
dumpall: bool = False,
codec: Optional[str] = None,
extractdir: Optional[str] = None,
show_fallback_xref: bool = False,
) -> None:
fp = open(fname, "rb")
parser = PDFParser(fp)
doc = PDFDocument(parser, password)
if objids:
for objid in objids:
obj = doc.getobj(objid)
dumpxml(outfp, obj, codec=codec)
if pagenos:
for (pageno, page) in enumerate(PDFPage.create_pages(doc)):
if pageno in pagenos:
if codec:
for obj in page.contents:
obj = stream_value(obj)
dumpxml(outfp, obj, codec=codec)
else:
dumpxml(outfp, page.attrs)
if dumpall:
dumpallobjs(outfp, doc, codec, show_fallback_xref)
if (not objids) and (not pagenos) and (not dumpall):
dumptrailers(outfp, doc, show_fallback_xref)
fp.close()
if codec not in ("raw", "binary"):
outfp.write("\n")
return
def create_parser() -> ArgumentParser:
parser = ArgumentParser(description=__doc__, add_help=True)
parser.add_argument(
"files",
type=str,
default=None,
nargs="+",
help="One or more paths to PDF files.",
)
parser.add_argument(
"--version",
"-v",
action="version",
version="pdfminer.six v{}".format(pdfminer.__version__),
)
parser.add_argument(
"--debug",
"-d",
default=False,
action="store_true",
help="Use debug logging level.",
)
procedure_parser = parser.add_mutually_exclusive_group()
procedure_parser.add_argument(
"--extract-toc",
"-T",
default=False,
action="store_true",
help="Extract structure of outline",
)
procedure_parser.add_argument(
"--extract-embedded", "-E", type=str, help="Extract embedded files"
)
parse_params = parser.add_argument_group(
"Parser", description="Used during PDF parsing"
)
parse_params.add_argument(
"--page-numbers",
type=int,
default=None,
nargs="+",
help="A space-seperated list of page numbers to parse.",
)
parse_params.add_argument(
"--pagenos",
"-p",
type=str,
help="A comma-separated list of page numbers to parse. Included for "
"legacy applications, use --page-numbers for more idiomatic "
"argument entry.",
)
parse_params.add_argument(
"--objects",
"-i",
type=str,
help="Comma separated list of object numbers to extract",
)
parse_params.add_argument(
"--all",
"-a",
default=False,
action="store_true",
help="If the structure of all objects should be extracted",
)
parse_params.add_argument(
"--show-fallback-xref",
action="store_true",
help="Additionally show the fallback xref. Use this if the PDF "
"has zero or only invalid xref's. This setting is ignored if "
"--extract-toc or --extract-embedded is used.",
)
parse_params.add_argument(
"--password",
"-P",
type=str,
default="",
help="The password to use for decrypting PDF file.",
)
output_params = parser.add_argument_group(
"Output", description="Used during output generation."
)
output_params.add_argument(
"--outfile",
"-o",
type=str,
default="-",
help='Path to file where output is written. Or "-" (default) to '
"write to stdout.",
)
codec_parser = output_params.add_mutually_exclusive_group()
codec_parser.add_argument(
"--raw-stream",
"-r",
default=False,
action="store_true",
help="Write stream objects without encoding",
)
codec_parser.add_argument(
"--binary-stream",
"-b",
default=False,
action="store_true",
help="Write stream objects with binary encoding",
)
codec_parser.add_argument(
"--text-stream",
"-t",
default=False,
action="store_true",
help="Write stream objects as plain text",
)
return parser
def main(argv: Optional[List[str]] = None) -> None:
parser = create_parser()
args = parser.parse_args(args=argv)
if args.debug:
logging.getLogger().setLevel(logging.DEBUG)
if args.outfile == "-":
outfp = sys.stdout
else:
outfp = open(args.outfile, "w")
if args.objects:
objids = [int(x) for x in args.objects.split(",")]
else:
objids = []
if args.page_numbers:
pagenos = {x - 1 for x in args.page_numbers}
elif args.pagenos:
pagenos = {int(x) - 1 for x in args.pagenos.split(",")}
else:
pagenos = set()
password = args.password
if args.raw_stream:
codec: Optional[str] = "raw"
elif args.binary_stream:
codec = "binary"
elif args.text_stream:
codec = "text"
else:
codec = None
for fname in args.files:
if args.extract_toc:
dumpoutline(
outfp,
fname,
objids,
pagenos,
password=password,
dumpall=args.all,
codec=codec,
extractdir=None,
)
elif args.extract_embedded:
extractembedded(fname, password=password, extractdir=args.extract_embedded)
else:
dumppdf(
outfp,
fname,
objids,
pagenos,
password=password,
dumpall=args.all,
codec=codec,
extractdir=None,
show_fallback_xref=args.show_fallback_xref,
)
outfp.close()
if __name__ == "__main__":
main()