diff --git a/camelot/ext/__init__.py b/camelot/ext/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/camelot/ext/ghostscript/COPYING b/camelot/ext/ghostscript/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/camelot/ext/ghostscript/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. 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But first, please read +. diff --git a/camelot/ext/ghostscript/__init__.py b/camelot/ext/ghostscript/__init__.py new file mode 100644 index 0000000..ab887df --- /dev/null +++ b/camelot/ext/ghostscript/__init__.py @@ -0,0 +1,135 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- +""" +ghostscript - A Python interface for the Ghostscript interpreter C-API +""" +# +# Copyright 2010-2018 by Hartmut Goebel +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# + +from __future__ import absolute_import + +__author__ = "Hartmut Goebel " +__copyright__ = "Copyright 2010-2018 by Hartmut Goebel " +__licence__ = "GNU General Public License version 3 (GPL v3)" +__version__ = '0.6' + +__all__ = ['Ghostscript', 'revision', + 'GhostscriptError', 'PleaseDisplayUsage'] + +import atexit +from . import _gsprint as gs + + +GhostscriptError = gs.GhostscriptError + + +def PleaseDisplayUsage(Warning): + """ + This exception is raised when Ghostscript asks the application to + display the usage. The application should catch the exception an + print the usage message. + """ + pass + + +def revision(): + """ + This function returns the revision numbers and strings of the + Ghostscript interpreter library as a dict. You should call it + before any other interpreter library functions to make sure that + the correct version of the Ghostscript interpreter has been + loaded. + """ + rev = gs.revision() + return dict((f, getattr(rev, f)) for f, _ in rev._fields_) + + +MAX_STRING_LENGTH = gs.MAX_STRING_LENGTH + + +class Ghostscript(object): + @staticmethod + def revision(): + return revision() + + def __init__(self, instance, args, stdin=None, stdout=None, stderr=None): + self._initialized = False + self._callbacks = None + if stdin or stdout or stderr: + self.set_stdio(stdin, stdout, stderr) + rc = gs.init_with_args(instance, args) + if rc == gs.e_Info: + raise PleaseDisplayUsage + self._initialized = True + if rc == gs.e_Quit: + self.exit() + + def __enter__(self): + return self + + def __exit__(self, *args): + self.exit() + + def set_stdio(self, stdin=None, stdout=None, stderr=None): + """Set stdin, stdout and stderr of the ghostscript interpreter. + + The ``stdin`` stream has to support the ``readline()`` + interface. The ``stdout`` and ``stderr`` streams have to + support the ``write()`` and ``flush()`` interface. + + Please note that this does not affect the input- and output- + streams of the devices. Esp. setting stdout does not allow + catching the devise-output even when using ``-sOutputFile=-``. + + """ + global __instance__ + self._callbacks = ( + stdin and gs._wrap_stdin(stdin) or None, + stdout and gs._wrap_stdout(stdout) or None, + stderr and gs._wrap_stderr(stderr) or None, + ) + gs.set_stdio(__instance__, *self._callbacks) + + def __del__(self): + self.exit() + + def exit(self): + global __instance__ + if self._initialized: + if __instance__ is not None: + gs.exit(__instance__) + gs.delete_instance(__instance__) + __instance__ = None + self._initialized = False + + +__Ghostscript = Ghostscript +__instance__ = None + + +def Ghostscript(*args, **kwargs): + """ + Factory function for setting up a Ghostscript instance + """ + global __instance__, __object_count__ + # Ghostscript only supports a single instance + if __instance__ is None: + __instance__ = gs.new_instance() + return __Ghostscript(__instance__, args, + stdin=kwargs.get('stdin', None), + stdout=kwargs.get('stdout', None), + stderr=kwargs.get('stderr', None)) diff --git a/camelot/ext/ghostscript/_errors.py b/camelot/ext/ghostscript/_errors.py new file mode 100644 index 0000000..ca6bb32 --- /dev/null +++ b/camelot/ext/ghostscript/_errors.py @@ -0,0 +1,123 @@ +""" +Definition of Ghostscript error codes +""" +# +# Copyright (C) 2010-2018 by Hartmut Goebel +# +# Based on iapi.h which is +# Copyright (C) 1989, 1995, 1998, 1999 Aladdin Enterprises. All rights reserved. +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# + +__author__ = "Hartmut Goebel " +__copyright__ = "Copyright 2010-2018 by Hartmut Goebel " +__licence__ = "GNU General Public License version 3 (GPL v3)" +__version__ = "0.6" + + +LEVEL1_ERROR_NAMES = ["unknownerror", "dictfull", "dictstackoverflow", + "dictstackunderflow", "execstackoverflow", + "interrupt", "invalidaccess", "invalidexit", + "invalidfileaccess", "invalidfont", + "invalidrestore", "ioerror", "limitcheck", + "nocurrentpoint", "rangecheck", "stackoverflow", + "stackunderflow", "syntaxerror", "timeout", + "typecheck", "undefined", "undefinedfilename", + "undefinedresult", "unmatchedmark", "VMerror"] + +LEVEL2_ERROR_NAMES = ["configurationerror", "invalidcontext", + "undefinedresource", "unregistered", + "invalidid"] + +ERROR_NAMES = LEVEL1_ERROR_NAMES + LEVEL2_ERROR_NAMES + +PSEUDO_ERROR_NAMES = ['Fatal', 'Quit', 'InterpreterExit', 'RemapColor', + 'ExecStackUnderflow', 'VMreclaim', 'NeedInput', + 'NeedStdin', 'NeedStdout', 'NeedStderr', 'Info'] + + +def error2name(ecode): + if ecode <= e_Fatal: + return PSEUDO_ERROR_NAMES[-ecode-100] + else: + return ERROR_NAMES[-ecode-1] + + +# +# Internal code for a fatal error. +# gs_interpret also returns this for a .quit with a positive exit code. +# +e_Fatal = -100 + +# +# Internal code for the .quit operator. +# The real quit code is an integer on the operand stack. +# gs_interpret returns this only for a .quit with a zero exit code. +# +e_Quit = -101 + +# +# Internal code for a normal exit from the interpreter. +# Do not use outside of interp.c. +# +e_InterpreterExit = -102 + +# +# Internal code that indicates that a procedure has been stored in the +# remap_proc of the graphics state, and should be called before retrying +# the current token. This is used for color remapping involving a call +# back into the interpreter -- inelegant, but effective. +# +e_RemapColor = -103 + +# +# Internal code to indicate we have underflowed the top block +# of the e-stack. +# +e_ExecStackUnderflow = -104 + +# +# Internal code for the vmreclaim operator with a positive operand. +# We need to handle this as an error because otherwise the interpreter +# won't reload enough of its state when the operator returns. +# +e_VMreclaim = -105 + +# +# Internal code for requesting more input from run_string. +# +e_NeedInput = -106 + +# +# Internal code for stdin callout. +# +e_NeedStdin = -107 + +# +# Internal code for stdout callout. +# +e_NeedStdout = -108 + +# +# Internal code for stderr callout. +# +e_NeedStderr = -109 + +# +# Internal code for a normal exit when usage info is displayed. +# This allows Window versions of Ghostscript to pause until +# the message can be read. +# +e_Info = -110 diff --git a/camelot/ext/ghostscript/_gsprint.py b/camelot/ext/ghostscript/_gsprint.py new file mode 100644 index 0000000..37a22a7 --- /dev/null +++ b/camelot/ext/ghostscript/_gsprint.py @@ -0,0 +1,272 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- +""" +ghostscript._gsprint - A low-level interface to the Ghostscript C-API using ctypes +""" +# +# Copyright 2010-2018 by Hartmut Goebel +# +# Display_callback Structure by Lasse Fister in 2013 +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# + +from __future__ import absolute_import + +__author__ = "Hartmut Goebel " +__copyright__ = "Copyright 2010-2018 by Hartmut Goebel " +__licence__ = "GNU General Public License version 3 (GPL v3)" +__version__ = "0.6" + +import sys +from ctypes import * + +from ._errors import e_Quit, e_Info + + +MAX_STRING_LENGTH = 65535 + +gs_main_instance = c_void_p +display_callback = c_void_p + + +class Revision(Structure): + _fields_ = [ + ("product", c_char_p), + ("copyright", c_char_p), + ("revision", c_long), + ("revisiondate", c_long) + ] + + +class GhostscriptError(Exception): + def __init__(self, ecode): + # :todo: + Exception.__init__(self, error2name(ecode)) + self.code = ecode + + +def revision(): + """ + Get version numbers and strings. + + This is safe to call at any time. + You should call this first to make sure that the correct version + of the Ghostscript is being used. + + Returns a Revision instance + """ + revision = Revision() + rc = libgs.gsapi_revision(pointer(revision), sizeof(revision)) + if rc: + raise ArgumentError("Revision structure size is incorrect, " + "requires %s bytes" % rc) + return revision + + +def new_instance(): # display_callback=None): + """ + Create a new instance of Ghostscript + + This instance is passed to most other API functions. + """ + # :todo: The caller_handle will be provided to callback functions. + display_callback = None + instance = gs_main_instance() + rc = libgs.gsapi_new_instance(pointer(instance), display_callback) + if rc != 0: + raise GhostscriptError(rc) + return instance + + +def delete_instance(instance): + """ + Destroy an instance of Ghostscript + + Before you call this, Ghostscript must have finished. + If Ghostscript has been initialised, you must call exit() + before delete_instance() + """ + return libgs.gsapi_delete_instance(instance) + + +c_stdstream_call_t = CFUNCTYPE(c_int, gs_main_instance, POINTER(c_char), c_int) + + +def _wrap_stdin(infp): + """ + Wrap a filehandle into a C function to be used as `stdin` callback + for ``set_stdio``. The filehandle has to support the readline() method. + """ + + def _wrap(instance, dest, count): + try: + data = infp.readline(count) + except: + count = -1 + else: + if not data: + count = 0 + else: + count = len(data) + memmove(dest, c_char_p(data), count) + return count + + return c_stdstream_call_t(_wrap) + + +def _wrap_stdout(outfp): + """ + Wrap a filehandle into a C function to be used as `stdout` or + `stderr` callback for ``set_stdio``. The filehandle has to support the + write() and flush() methods. + """ + + def _wrap(instance, str, count): + outfp.write(str[:count]) + outfp.flush() + return count + + return c_stdstream_call_t(_wrap) + + +_wrap_stderr = _wrap_stdout + + +def set_stdio(instance, stdin, stdout, stderr): + """ + Set the callback functions for stdio. + + ``stdin``, ``stdout`` and ``stderr`` have to be ``ctypes`` + callback functions matching the ``_gsprint.c_stdstream_call_t`` + prototype. You may want to use _wrap_* to wrap file handles. + + Note 1: This function only changes stdio of the Postscript + interpreter, not that of the devices. + + Note 2: Make sure you keep references to C function objects + as long as they are used from C code. Otherwise they may be + garbage collected, crashing your program when a callback is made. + + The ``stdin`` callback function should return the number of + characters read, `0` for EOF, or `-1` for error. The `stdout` and + `stderr` callback functions should return the number of characters + written. + + You may pass ``None`` for any of stdin, stdout or stderr , in which + case the system stdin, stdout resp. stderr will be used. + """ + rc = libgs.gsapi_set_stdio(instance, stdin, stdout, stderr) + if rc not in (0, e_Quit, e_Info): + raise GhostscriptError(rc) + return rc + + +# :todo: set_poll (instance, int(*poll_fn)(void *caller_handle)); +# :todo: set_display_callback(instance, callback): + + +def init_with_args(instance, argv): + """ + Initialise the interpreter. + + 1. If quit or EOF occur during init_with_args(), the return value + will be e_Quit. This is not an error. You must call exit() and + must not call any other functions. + + 2. If usage info should be displayed, the return value will be + e_Info which is not an error. Do not call exit(). + + 3. Under normal conditions this returns 0. You would then call one + or more run_*() functions and then finish with exit() + """ + ArgArray = c_char_p * len(argv) + c_argv = ArgArray(*argv) + rc = libgs.gsapi_init_with_args(instance, len(argv), c_argv) + if rc not in (0, e_Quit, e_Info): + raise GhostscriptError(rc) + return rc + + +def exit(instance): + """ + Exit the interpreter + + This must be called on shutdown if init_with_args() has been + called, and just before delete_instance() + """ + rc = libgs.gsapi_exit(instance) + if rc != 0: + raise GhostscriptError(rc) + return rc + + +def __win32_finddll(): + try: + import winreg + except ImportError: + # assume Python 2 + from _winreg import OpenKey, CloseKey, EnumKey, QueryValueEx, \ + QueryInfoKey, HKEY_LOCAL_MACHINE + else: + from winreg import OpenKey, CloseKey, EnumKey, QueryValueEx, \ + QueryInfoKey, HKEY_LOCAL_MACHINE + + from distutils.version import LooseVersion + import os + + dlls = [] + # Look up different variants of Ghostscript and take the highest + # version for which the DLL is to be found in the filesystem. + for key_name in ('AFPL Ghostscript', 'Aladdin Ghostscript', + 'GPL Ghostscript', 'GNU Ghostscript'): + try: + k1 = OpenKey(HKEY_LOCAL_MACHINE, "Software\\%s" % key_name) + for num in range(0, QueryInfoKey(k1)[0]): + version = EnumKey(k1, num) + try: + k2 = OpenKey(k1, version) + dll_path = QueryValueEx(k2, 'GS_DLL')[0] + CloseKey(k2) + if os.path.exists(dll_path): + dlls.append((LooseVersion(version), dll_path)) + except WindowsError: + pass + CloseKey(k1) + except WindowsError: + pass + if dlls: + dlls.sort() + return dlls[-1][-1] + else: + return None + + +if sys.platform == 'win32': + libgs = __win32_finddll() + if not libgs: + raise RuntimeError('Can not find Ghostscript DLL in registry') + libgs = windll.LoadLibrary(libgs) +else: + try: + libgs = cdll.LoadLibrary("libgs.so") + except OSError: + # shared object file not found + import ctypes.util + libgs = ctypes.util.find_library('gs') + if not libgs: + raise RuntimeError('Can not find Ghostscript library (libgs)') + libgs = cdll.LoadLibrary(libgs) + +del __win32_finddll diff --git a/camelot/parsers/lattice.py b/camelot/parsers/lattice.py index 467a740..cfa3719 100644 --- a/camelot/parsers/lattice.py +++ b/camelot/parsers/lattice.py @@ -9,12 +9,12 @@ import logging import warnings import subprocess -import ghostscript import numpy as np import pandas as pd from .base import BaseParser from ..core import Table +from ..ext.ghostscript import Ghostscript from ..utils import (scale_image, scale_pdf, segments_in_bbox, text_in_bbox, merge_close_lines, get_table_index, compute_accuracy, compute_whitespace) @@ -178,17 +178,11 @@ class Lattice(BaseParser): def _generate_image(self): self.imagename = ''.join([self.rootname, '.png']) - gs_call = [ - '-q', - '-sDEVICE=png16m', - '-o', - self.imagename, - '-r600', - self.filename - ] - encoding = locale.getpreferredencoding() - args = [g.encode(encoding) for g in gs_call] - ghostscript.Ghostscript(*args) + gs_call = '-q -sDEVICE=png16m -o {} -r600 {}'.format( + self.imagename, self.filename) + gs_call = gs_call.encode().split() + with Ghostscript(*gs_call) as gs: + pass def _generate_table_bbox(self): self.image, self.threshold = adaptive_threshold(