SWIG Python wrapper guarded by --enable-python-bindings

.gitignore

@@ -0,0 +1,72 @@
+*.pyc
+**/*.deps/
+/.ccls-cache/
+/*.pc
+/aclocal.m4
+/autom4te.cache
+/compile
+/config.guess
+/config.log
+/config.status
+/config.sub
+/configure
+/depcomp
+/INSTALL
+/install-sh
+/m4/libtool.m4
+/m4/lt~obsolete.m4
+/m4/ltoptions.m4
+/m4/ltsugar.m4
+/m4/ltversion.m4
+/Makefile
+/Makefile.in
+/missing
+
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+lrx-comp
+lrx-proc
+lrx_config.h
+lrx_config.h.in
+multitrans
+stamp-h1
+
+/python/Makefile.in
+/python/Makefile
+/python/lex_tools_wrap.cpp
+/python/lextools.py
+/python/setup.py
+/python/build*
+*.egg-info/
+*.egg

Makefile.am

@@ -21,4 +21,8 @@ if HAVE_IRSTLM
     bin_PROGRAMS += irstlm_ranker
 endif
 
+if HAVE_PYTHON_BINDINGS
+SUBDIRS = python
+endif
+
 EXTRA_DIST = lrx_compiler.h lrx_processor.h multi_translator.h tagger_output_processor.h

configure.ac

@@ -85,13 +85,21 @@ AX_CHECK_COMPILE_FLAG([-std=c++20], [CXXFLAGS="$CXXFLAGS -std=c++20"], [
  ])
 ])
 
-AC_CONFIG_FILES([
-                 Makefile
-                 ])
-AC_OUTPUT
+AC_CONFIG_FILES([python/setup.py])
 
 AS_IF([test "x$irstlm" == "xno"],
       [AC_MSG_NOTICE([IRSTLM is not enabled; you will not be able run monolingual rule-learning; enable using --with-irstlm])])
 
 AS_IF([test "x$yasmet" == "xno"],
       [AC_MSG_NOTICE([YASMET is not enabled; you will not be able run maximum-entropy training; enable using --with-yasmet])])
+
+AM_PATH_PYTHON([3.4], [], [AC_MSG_WARN([Can't generate SWIG wrapper without Python])])
+
+AC_ARG_ENABLE([python-bindings],
+              AS_HELP_STRING([--enable-python-bindings],
+                             [build python bindings (default=disabled)]),
+              [enable_python_bindings=$enableval],
+              [enable_python_bindings=no])
+AM_CONDITIONAL([HAVE_PYTHON_BINDINGS], [test x$enable_python_bindings = xyes])
+
+AC_OUTPUT([Makefile python/Makefile])

python/Makefile.am

@@ -0,0 +1,9 @@
+SWIG_INTERFACE = lex_tools.i
+
+BUILT_SOURCES = %_wrap.cpp
+
+%_wrap.cpp: $(SWIG_INTERFACE) setup.py
+	$(PYTHON) setup.py build
+
+install-exec-local:
+	$(PYTHON) setup.py install --prefix=$(DESTDIR)$(prefix)

python/lex_tools.i

@@ -0,0 +1,60 @@
+%module lextools
+
+%{
+#define SWIG_FILE_WITH_INIT
+#include <lrx_processor.h>
+
+
+class LRX: public LRXProcessor
+{
+public:
+  /**
+   * Imitates functionality of lrx_proc using file path
+   */
+  void lrx_proc(char arg, char *dictionary_path, char *input_path, char *output_path);
+};
+
+
+void
+LRX::lrx_proc(char arg, char *dictionary_path, char *input_path, char *output_path)
+{
+  bool useMaxEnt = false;
+  FILE *in = fopen(dictionary_path, "rb");
+  load(in);
+  FILE *input = fopen(input_path, "r"), *output = fopen(output_path, "w");
+  switch(arg)
+  {
+    case 'm':
+      useMaxEnt = true;
+      break;
+    default:
+      useMaxEnt = false;
+  }
+  init();
+  if(useMaxEnt)
+  {
+    processME(input, output);
+  }
+  else
+  {
+    process(input, output);
+  }
+  fclose(in);
+  fclose(input);
+  fclose(output);
+}
+
+%}
+
+
+%include <lrx_processor.h>
+
+
+class LRX: public LRXProcessor
+{
+public:
+  /**
+   * Imitates functionality of lrx_proc using file path
+   */
+  void lrx_proc(char arg, char *dictionary_path, char *input_path, char *output_path);
+};

python/setup.py.in

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+"""
+Setup for SWIG Python bindings for lex-tools
+"""
+from os import path
+from distutils.core import Extension, setup
+from distutils.command.build import build
+
+
+class CustomBuild(build):
+    sub_commands = [
+        ('build_ext', build.has_ext_modules),
+        ('build_py', build.has_pure_modules),
+        ('build_clib', build.has_c_libraries),
+        ('build_scripts', build.has_scripts),
+    ]
+
+
+def get_sources():
+    sources = ['lex_tools.i']
+    cc_sources = ['lrx_processor.cc']
+    rel_path = '..'
+    sources.extend(path.join(rel_path, f) for f in cc_sources)
+    return sources
+
+def get_include_dirs():
+    # get rid of '-I' in LTTOOLBOX_CFLAGS and split list from 1, to remove extra element ''
+    # Strip extra space at end
+    dirs = '@LTTOOLBOX_CFLAGS@'.split('-I')[1:]
+    dirs += '@LIBXML_LIBS@'.split('-I')[1:]
+    dirs = [x.strip() for x in dirs]
+    return dirs + ['..']
+
+
+lextools_module = Extension(
+    name='_lextools',
+    sources=get_sources(),
+    swig_opts = ["-c++", "-I..", "-Wall"],
+    include_dirs=get_include_dirs(),
+    library_dirs=['/usr/include/libxml2', '/usr/local/lib'],
+    extra_compile_args='@CXXFLAGS@'.split(),
+    extra_link_args=['-lxml2', '-llttoolbox3'],
+)
+
+setup(
+    name='@PACKAGE@',
+    version='@PACKAGE_VERSION@',
+    description='SWIG interface to @PACKAGE_NAME@',
+    long_description="SWIG interface to @PACKAGE_NAME@ for use in apertium-python",
+    # TODO: author, maintainer, url
+    author_email='@PACKAGE_BUGREPORT@',
+    license='GPL-3.0+',
+    maintainer_email='@PACKAGE_BUGREPORT@',
+    cmdclass={'build': CustomBuild},
+    ext_modules=[lextools_module],
+    py_modules=['lextools'],
+)