501 lines
13 KiB
C++
501 lines
13 KiB
C++
/*
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* Copyright (c) 2003-2009, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <system.hh>
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#include "pyinterp.h"
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#include "account.h"
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#include "xact.h"
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#include "post.h"
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namespace ledger {
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using namespace python;
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shared_ptr<python_interpreter_t> python_session;
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char * argv0;
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void export_account();
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void export_amount();
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void export_balance();
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void export_commodity();
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void export_expr();
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void export_format();
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void export_item();
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void export_journal();
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void export_post();
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void export_times();
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void export_utils();
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void export_value();
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void export_xact();
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void initialize_for_python()
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{
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export_account();
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export_amount();
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export_balance();
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export_commodity();
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export_expr();
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export_format();
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export_item();
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export_journal();
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export_post();
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export_times();
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export_utils();
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export_value();
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export_xact();
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}
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struct python_run
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{
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object result;
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python_run(python_interpreter_t * intepreter,
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const string& str, int input_mode)
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: result(handle<>(borrowed(PyRun_String(str.c_str(), input_mode,
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intepreter->main_nspace.ptr(),
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intepreter->main_nspace.ptr())))) {}
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operator object() {
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return result;
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}
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};
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void python_interpreter_t::initialize()
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{
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TRACE_START(python_init, 1, "Initialized Python");
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try {
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DEBUG("python.interp", "Initializing Python");
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Py_Initialize();
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assert(Py_IsInitialized());
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hack_system_paths();
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object main_module = python::import("__main__");
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if (! main_module)
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throw_(std::runtime_error,
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_("Python failed to initialize (couldn't find __main__)"));
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main_nspace = extract<dict>(main_module.attr("__dict__"));
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if (! main_nspace)
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throw_(std::runtime_error,
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_("Python failed to initialize (couldn't find __dict__)"));
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python::detail::init_module("ledger", &initialize_for_python);
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is_initialized = true;
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}
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catch (const error_already_set&) {
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PyErr_Print();
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throw_(std::runtime_error, _("Python failed to initialize"));
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}
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TRACE_FINISH(python_init, 1);
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}
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void python_interpreter_t::hack_system_paths()
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{
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// Hack ledger.__path__ so it points to a real location
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python::object sys_module = python::import("sys");
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python::object sys_dict = sys_module.attr("__dict__");
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python::list paths(sys_dict["path"]);
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#if defined(DEBUG_ON)
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bool path_initialized = false;
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#endif
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int n = python::extract<int>(paths.attr("__len__")());
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for (int i = 0; i < n; i++) {
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python::extract<std::string> str(paths[i]);
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path pathname(str);
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DEBUG("python.interp", "sys.path = " << pathname);
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if (exists(pathname / "ledger" / "__init__.py")) {
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if (python::object module_ledger = python::import("ledger")) {
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DEBUG("python.interp",
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"Setting ledger.__path__ = " << (pathname / "ledger"));
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python::object ledger_dict = module_ledger.attr("__dict__");
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python::list temp_list;
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temp_list.append((pathname / "ledger").string());
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ledger_dict["__path__"] = temp_list;
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} else {
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throw_(std::runtime_error,
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_("Python failed to initialize (couldn't find ledger)"));
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}
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#if defined(DEBUG_ON)
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path_initialized = true;
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#endif
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break;
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}
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}
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#if defined(DEBUG_ON)
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if (! path_initialized)
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DEBUG("python.init",
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"Ledger failed to find 'ledger/__init__.py' on the PYTHONPATH");
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#endif
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}
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object python_interpreter_t::import_into_main(const string& str)
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{
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if (! is_initialized)
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initialize();
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try {
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object mod = python::import(str.c_str());
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if (! mod)
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throw_(std::runtime_error,
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_("Failed to import Python module %1") << str);
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// Import all top-level entries directly into the main namespace
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main_nspace.update(mod.attr("__dict__"));
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return mod;
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}
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catch (const error_already_set&) {
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PyErr_Print();
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}
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return object();
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}
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object python_interpreter_t::import_option(const string& str)
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{
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path file(str);
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python::object sys_module = python::import("sys");
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python::object sys_dict = sys_module.attr("__dict__");
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python::list paths(sys_dict["path"]);
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#if BOOST_VERSION >= 103700
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paths.insert(0, file.parent_path().string());
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sys_dict["path"] = paths;
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string name = file.filename();
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if (contains(name, ".py"))
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name = file.stem();
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#else // BOOST_VERSION >= 103700
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paths.insert(0, file.branch_path().string());
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sys_dict["path"] = paths;
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string name = file.leaf();
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#endif // BOOST_VERSION >= 103700
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return python::import(python::str(name.c_str()));
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}
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object python_interpreter_t::eval(std::istream& in, py_eval_mode_t mode)
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{
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bool first = true;
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string buffer;
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buffer.reserve(4096);
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while (! in.eof()) {
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char buf[256];
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in.getline(buf, 255);
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if (buf[0] == '!')
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break;
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if (first)
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first = false;
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else
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buffer += "\n";
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buffer += buf;
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}
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if (! is_initialized)
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initialize();
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try {
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int input_mode = -1;
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switch (mode) {
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case PY_EVAL_EXPR: input_mode = Py_eval_input; break;
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case PY_EVAL_STMT: input_mode = Py_single_input; break;
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case PY_EVAL_MULTI: input_mode = Py_file_input; break;
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}
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return python_run(this, buffer, input_mode);
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}
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catch (const error_already_set&) {
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PyErr_Print();
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throw_(std::runtime_error, _("Failed to evaluate Python code"));
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}
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return object();
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}
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object python_interpreter_t::eval(const string& str, py_eval_mode_t mode)
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{
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if (! is_initialized)
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initialize();
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try {
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int input_mode = -1;
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switch (mode) {
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case PY_EVAL_EXPR: input_mode = Py_eval_input; break;
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case PY_EVAL_STMT: input_mode = Py_single_input; break;
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case PY_EVAL_MULTI: input_mode = Py_file_input; break;
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}
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return python_run(this, str, input_mode);
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}
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catch (const error_already_set&) {
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PyErr_Print();
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throw_(std::runtime_error, _("Failed to evaluate Python code"));
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}
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return object();
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}
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value_t python_interpreter_t::python_command(call_scope_t& args)
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{
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if (! is_initialized)
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initialize();
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char ** argv(new char *[args.size() + 1]);
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argv[0] = new char[std::strlen(argv0) + 1];
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std::strcpy(argv[0], argv0);
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for (std::size_t i = 0; i < args.size(); i++) {
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string arg = args[i].as_string();
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argv[i + 1] = new char[arg.length() + 1];
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std::strcpy(argv[i + 1], arg.c_str());
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}
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int status = 1;
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try {
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status = Py_Main(static_cast<int>(args.size()) + 1, argv);
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}
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catch (...) {
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for (std::size_t i = 0; i < args.size() + 1; i++)
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delete[] argv[i];
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delete[] argv;
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throw;
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}
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for (std::size_t i = 0; i < args.size() + 1; i++)
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delete[] argv[i];
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delete[] argv;
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if (status != 0)
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throw status;
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return NULL_VALUE;
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}
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value_t python_interpreter_t::server_command(call_scope_t& args)
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{
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if (! is_initialized)
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initialize();
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python::object server_module;
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try {
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server_module = python::import("ledger.server");
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if (! server_module)
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throw_(std::runtime_error,
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_("Could not import ledger.server; please check your PYTHONPATH"));
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}
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catch (const error_already_set&) {
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PyErr_Print();
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throw_(std::runtime_error,
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_("Could not import ledger.server; please check your PYTHONPATH"));
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}
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if (python::object main_function = server_module.attr("main")) {
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functor_t func(main_function, "main");
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try {
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func(args);
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}
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catch (const error_already_set&) {
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PyErr_Print();
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throw_(std::runtime_error,
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_("Error while invoking ledger.server's main() function"));
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}
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return true;
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} else {
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throw_(std::runtime_error,
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_("The ledger.server module is missing its main() function!"));
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}
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return false;
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}
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option_t<python_interpreter_t> *
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python_interpreter_t::lookup_option(const char * p)
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{
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switch (*p) {
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case 'i':
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OPT(import_);
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break;
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}
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return NULL;
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}
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expr_t::ptr_op_t python_interpreter_t::lookup(const symbol_t::kind_t kind,
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const string& name)
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{
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// Give our superclass first dibs on symbol definitions
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if (expr_t::ptr_op_t op = session_t::lookup(kind, name))
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return op;
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switch (kind) {
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case symbol_t::FUNCTION:
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if (option_t<python_interpreter_t> * handler = lookup_option(name.c_str()))
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return MAKE_OPT_FUNCTOR(python_interpreter_t, handler);
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if (is_initialized && main_nspace.has_key(name.c_str())) {
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DEBUG("python.interp", "Python lookup: " << name);
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if (python::object obj = main_nspace.get(name.c_str()))
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return WRAP_FUNCTOR(functor_t(obj, name));
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}
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break;
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case symbol_t::OPTION:
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if (option_t<python_interpreter_t> * handler = lookup_option(name.c_str()))
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return MAKE_OPT_HANDLER(python_interpreter_t, handler);
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break;
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case symbol_t::PRECOMMAND: {
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const char * p = name.c_str();
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switch (*p) {
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case 'p':
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if (is_eq(p, "python"))
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return MAKE_FUNCTOR(python_interpreter_t::python_command);
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break;
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case 's':
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if (is_eq(p, "server"))
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return MAKE_FUNCTOR(python_interpreter_t::server_command);
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break;
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}
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}
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default:
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break;
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}
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return NULL;
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}
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namespace {
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void append_value(list& lst, const value_t& value)
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{
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if (value.is_scope()) {
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const scope_t * scope = value.as_scope();
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if (const post_t * post = dynamic_cast<const post_t *>(scope))
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lst.append(ptr(post));
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else if (const xact_t * xact = dynamic_cast<const xact_t *>(scope))
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lst.append(ptr(xact));
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else if (const account_t * account =
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dynamic_cast<const account_t *>(scope))
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lst.append(ptr(account));
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else if (const period_xact_t * period_xact =
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dynamic_cast<const period_xact_t *>(scope))
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lst.append(ptr(period_xact));
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else if (const auto_xact_t * auto_xact =
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dynamic_cast<const auto_xact_t *>(scope))
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lst.append(ptr(auto_xact));
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else
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throw_(std::logic_error,
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_("Cannot downcast scoped object to specific type"));
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} else {
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lst.append(value);
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}
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}
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}
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value_t python_interpreter_t::functor_t::operator()(call_scope_t& args)
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{
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try {
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std::signal(SIGINT, SIG_DFL);
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if (! PyCallable_Check(func.ptr())) {
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extract<value_t> val(func);
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std::signal(SIGINT, sigint_handler);
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if (val.check())
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return val();
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return NULL_VALUE;
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}
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else if (args.size() > 0) {
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list arglist;
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// jww (2009-11-05): What about a single argument which is a sequence,
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// rather than a sequence of arguments?
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if (args.value().is_sequence())
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foreach (const value_t& value, args.value().as_sequence())
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append_value(arglist, value);
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else
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append_value(arglist, args.value());
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if (PyObject * val =
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PyObject_CallObject(func.ptr(), python::tuple(arglist).ptr())) {
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extract<value_t> xval(val);
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value_t result;
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if (xval.check()) {
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result = xval();
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Py_DECREF(val);
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} else {
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Py_DECREF(val);
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throw_(calc_error,
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_("Could not evaluate Python variable '%1'") << name);
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}
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std::signal(SIGINT, sigint_handler);
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return result;
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}
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else if (PyErr_Occurred()) {
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PyErr_Print();
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throw_(calc_error, _("Failed call to Python function '%1'") << name);
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} else {
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assert(false);
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}
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}
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else {
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std::signal(SIGINT, sigint_handler);
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return call<value_t>(func.ptr());
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}
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}
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catch (const error_already_set&) {
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std::signal(SIGINT, sigint_handler);
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PyErr_Print();
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throw_(calc_error, _("Failed call to Python function '%1'") << name);
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}
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catch (...) {
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std::signal(SIGINT, sigint_handler);
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}
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std::signal(SIGINT, sigint_handler);
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return NULL_VALUE;
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}
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} // namespace ledger
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