bpo-40688: Use the correct parser in the peg_generator scripts (GH-20235)
The scripts in `Tools/peg_generator/scripts` mostly assume that `ast.parse` and `compile` use the old parser, since this was the state of things, while we were developing them. They need to be updated to always use the correct parser. `_peg_parser` is being extended to support both parsing and compiling with both parsers.
This commit is contained in:
Lysandros Nikolaou
GitHub
parent
448325369f
commit
9645930b5b
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@ -1,60 +1,9 @@
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#include <Python.h>
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#include "pegen_interface.h"
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PyObject *
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_Py_parse_file(PyObject *self, PyObject *args, PyObject *kwds)
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static int
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_mode_str_to_int(char *mode_str)
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{
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static char *keywords[] = {"file", "mode", NULL};
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char *filename;
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char *mode_str = "exec";
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|s", keywords, &filename, &mode_str)) {
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return NULL;
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}
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int mode;
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if (strcmp(mode_str, "exec") == 0) {
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mode = Py_file_input;
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}
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else if (strcmp(mode_str, "single") == 0) {
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mode = Py_single_input;
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}
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else {
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return PyErr_Format(PyExc_ValueError, "mode must be either 'exec' or 'single'");
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}
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PyArena *arena = PyArena_New();
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if (arena == NULL) {
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return NULL;
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}
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PyCompilerFlags flags = _PyCompilerFlags_INIT;
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PyObject *result = NULL;
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mod_ty res = PyPegen_ASTFromFilename(filename, mode, &flags, arena);
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if (res == NULL) {
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goto error;
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}
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result = PyAST_mod2obj(res);
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error:
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PyArena_Free(arena);
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return result;
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}
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PyObject *
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_Py_parse_string(PyObject *self, PyObject *args, PyObject *kwds)
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{
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static char *keywords[] = {"string", "mode", "oldparser", NULL};
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char *the_string;
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char *mode_str = "exec";
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int oldparser = 0;
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|sp", keywords,
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&the_string, &mode_str, &oldparser)) {
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return NULL;
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}
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int mode;
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if (strcmp(mode_str, "exec") == 0) {
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mode = Py_file_input;
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@ -66,39 +15,119 @@ _Py_parse_string(PyObject *self, PyObject *args, PyObject *kwds)
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mode = Py_single_input;
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}
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else {
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mode = -1;
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}
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return mode;
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}
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static mod_ty
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_run_parser(char *str, char *filename, int mode, PyCompilerFlags *flags, PyArena *arena, int oldparser)
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{
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mod_ty mod;
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if (!oldparser) {
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mod = PyPegen_ASTFromString(str, filename, mode, flags, arena);
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}
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else {
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mod = PyParser_ASTFromString(str, filename, mode, flags, arena);
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}
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return mod;
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}
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PyObject *
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_Py_compile_string(PyObject *self, PyObject *args, PyObject *kwds)
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{
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static char *keywords[] = {"string", "filename", "mode", "oldparser", NULL};
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char *the_string;
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char *filename = "<string>";
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char *mode_str = "exec";
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int oldparser = 0;
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|ssp", keywords,
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&the_string, &filename, &mode_str, &oldparser)) {
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return NULL;
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}
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int mode = _mode_str_to_int(mode_str);
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if (mode == -1) {
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return PyErr_Format(PyExc_ValueError, "mode must be either 'exec' or 'eval' or 'single'");
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}
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PyCompilerFlags flags = _PyCompilerFlags_INIT;
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flags.cf_flags = PyCF_IGNORE_COOKIE;
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PyArena *arena = PyArena_New();
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if (arena == NULL) {
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return NULL;
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}
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PyObject *result = NULL;
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mod_ty mod = _run_parser(the_string, filename, mode, &flags, arena, oldparser);
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if (mod == NULL) {
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PyArena_Free(arena);
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return NULL;
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}
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PyObject *filename_ob = PyUnicode_DecodeFSDefault(filename);
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if (filename_ob == NULL) {
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PyArena_Free(arena);
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return NULL;
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}
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PyCodeObject *result = PyAST_CompileObject(mod, filename_ob, &flags, -1, arena);
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Py_XDECREF(filename_ob);
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PyArena_Free(arena);
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return (PyObject *)result;
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}
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PyObject *
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_Py_parse_string(PyObject *self, PyObject *args, PyObject *kwds)
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{
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static char *keywords[] = {"string", "filename", "mode", "oldparser", NULL};
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char *the_string;
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char *filename = "<string>";
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char *mode_str = "exec";
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int oldparser = 0;
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|ssp", keywords,
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&the_string, &filename, &mode_str, &oldparser)) {
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return NULL;
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}
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int mode = _mode_str_to_int(mode_str);
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if (mode == -1) {
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return PyErr_Format(PyExc_ValueError, "mode must be either 'exec' or 'eval' or 'single'");
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}
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PyCompilerFlags flags = _PyCompilerFlags_INIT;
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flags.cf_flags = PyCF_IGNORE_COOKIE;
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mod_ty res;
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if (oldparser) {
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res = PyParser_ASTFromString(the_string, "<string>", mode, &flags, arena);
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PyArena *arena = PyArena_New();
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if (arena == NULL) {
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return NULL;
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}
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else {
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res = PyPegen_ASTFromString(the_string, "<string>", mode, &flags, arena);
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}
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if (res == NULL) {
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goto error;
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}
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result = PyAST_mod2obj(res);
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error:
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mod_ty mod = _run_parser(the_string, filename, mode, &flags, arena, oldparser);
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if (mod == NULL) {
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PyArena_Free(arena);
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return NULL;
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}
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PyObject *result = PyAST_mod2obj(mod);
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PyArena_Free(arena);
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return result;
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}
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static PyMethodDef ParseMethods[] = {
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{"parse_file", (PyCFunction)(void (*)(void))_Py_parse_file, METH_VARARGS|METH_KEYWORDS, "Parse a file."},
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{"parse_string", (PyCFunction)(void (*)(void))_Py_parse_string, METH_VARARGS|METH_KEYWORDS,"Parse a string."},
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{
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"parse_string",
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(PyCFunction)(void (*)(void))_Py_parse_string,
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METH_VARARGS|METH_KEYWORDS,
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"Parse a string, return an AST."
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},
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{
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"compile_string",
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(PyCFunction)(void (*)(void))_Py_compile_string,
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METH_VARARGS|METH_KEYWORDS,
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"Compile a string, return a code object."
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},
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{NULL, NULL, 0, NULL} /* Sentinel */
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};
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@ -69,25 +69,22 @@ stats: peg_extension/parse.c data/xxl.py
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time: time_compile
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time_compile: venv peg_extension/parse.c data/xxl.py
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time_compile: venv data/xxl.py
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$(VENVPYTHON) scripts/benchmark.py --parser=pegen --target=xxl compile
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time_parse: venv peg_extension/parse.c data/xxl.py
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time_parse: venv data/xxl.py
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$(VENVPYTHON) scripts/benchmark.py --parser=pegen --target=xxl parse
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time_check: venv peg_extension/parse.c data/xxl.py
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$(VENVPYTHON) scripts/benchmark.py --parser=pegen --target=xxl check
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time_old: time_old_compile
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time_stdlib: time_stdlib_compile
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time_stdlib_compile: venv peg_extension/parse.c data/xxl.py
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time_old_compile: venv data/xxl.py
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$(VENVPYTHON) scripts/benchmark.py --parser=cpython --target=xxl compile
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time_stdlib_parse: venv peg_extension/parse.c data/xxl.py
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time_old_parse: venv data/xxl.py
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$(VENVPYTHON) scripts/benchmark.py --parser=cpython --target=xxl parse
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test_local:
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$(PYTHON) scripts/test_parse_directory.py \
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time_peg_dir: venv
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$(VENVPYTHON) scripts/test_parse_directory.py \
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--grammar-file $(GRAMMAR) \
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--tokens-file $(TOKENS) \
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-d $(TESTDIR) \
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@ -96,8 +93,8 @@ test_local:
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--exclude "*/failset/**" \
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--exclude "*/failset/**/*"
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test_global: $(CPYTHON)
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$(PYTHON) scripts/test_parse_directory.py \
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time_stdlib: $(CPYTHON) venv
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$(VENVPYTHON) scripts/test_parse_directory.py \
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--grammar-file $(GRAMMAR) \
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--tokens-file $(TOKENS) \
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-d $(CPYTHON) \
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@ -113,9 +110,6 @@ mypy: regen-metaparser
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format-python:
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black pegen scripts
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bench: venv
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$(VENVPYTHON) scripts/benchmark.py --parser=pegen --target=stdlib check
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format: format-python
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find_max_nesting:
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@ -6,6 +6,8 @@ import sys
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import os
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from time import time
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import _peg_parser
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try:
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import memory_profiler
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except ModuleNotFoundError:
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@ -14,8 +16,6 @@ except ModuleNotFoundError:
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sys.exit(1)
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sys.path.insert(0, os.getcwd())
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from peg_extension import parse
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from pegen.build import build_c_parser_and_generator
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from scripts.test_parse_directory import parse_directory
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argparser = argparse.ArgumentParser(
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@ -41,9 +41,6 @@ command_compile = subcommands.add_parser(
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"compile", help="Benchmark parsing and compiling to bytecode"
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)
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command_parse = subcommands.add_parser("parse", help="Benchmark parsing and generating an ast.AST")
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command_check = subcommands.add_parser(
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"check", help="Benchmark parsing and throwing the tree away"
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)
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def benchmark(func):
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@ -66,22 +63,20 @@ def benchmark(func):
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@benchmark
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def time_compile(source, parser):
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if parser == "cpython":
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return compile(source, os.path.join("data", "xxl.py"), "exec")
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return _peg_parser.compile_string(
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source,
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oldparser=True,
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)
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else:
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return parse.parse_string(source, mode=2)
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return _peg_parser.compile_string(source)
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@benchmark
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def time_parse(source, parser):
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if parser == "cpython":
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return ast.parse(source, os.path.join("data", "xxl.py"), "exec")
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return _peg_parser.parse_string(source, oldparser=True)
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else:
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return parse.parse_string(source, mode=1)
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@benchmark
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def time_check(source):
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return parse.parse_string(source, mode=0)
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return _peg_parser.parse_string(source)
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def run_benchmark_xxl(subcommand, parser, source):
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@ -89,32 +84,20 @@ def run_benchmark_xxl(subcommand, parser, source):
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time_compile(source, parser)
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elif subcommand == "parse":
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time_parse(source, parser)
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elif subcommand == "check":
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time_check(source)
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def run_benchmark_stdlib(subcommand, parser):
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modes = {"compile": 2, "parse": 1, "check": 0}
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extension = None
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if parser == "pegen":
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extension = build_c_parser_and_generator(
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"../../Grammar/python.gram",
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"../../Grammar/Tokens",
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"peg_extension/parse.c",
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compile_extension=True,
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skip_actions=False,
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)
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for _ in range(3):
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parse_directory(
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"../../Lib",
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"../../Grammar/python.gram",
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"../../Grammar/Tokens",
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verbose=False,
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excluded_files=["*/bad*", "*/lib2to3/tests/data/*",],
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skip_actions=False,
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tree_arg=0,
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short=True,
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extension=extension,
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mode=modes[subcommand],
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mode=2 if subcommand == "compile" else 1,
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parser=parser,
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)
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@ -127,8 +110,6 @@ def main():
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if subcommand is None:
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argparser.error("A benchmark to run is required")
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if subcommand == "check" and parser == "cpython":
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argparser.error("Cannot use check target with the CPython parser")
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if target == "xxl":
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with open(os.path.join("data", "xxl.py"), "r") as f:
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@ -30,6 +30,8 @@ import os
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import sys
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import tempfile
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import _peg_parser
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from typing import List
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sys.path.insert(0, os.getcwd())
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@ -72,7 +74,7 @@ def diff_trees(a: ast.AST, b: ast.AST, verbose: bool = False) -> List[str]:
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def show_parse(source: str, verbose: bool = False) -> str:
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tree = ast.parse(source)
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tree = _peg_parser.parse_string(source, oldparser=True)
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return format_tree(tree, verbose).rstrip("\n")
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@ -90,17 +92,11 @@ def main() -> None:
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sep = " "
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program = sep.join(args.program)
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if args.grammar_file:
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sys.path.insert(0, os.curdir)
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from pegen.build import build_parser_and_generator
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build_parser_and_generator(args.grammar_file, "peg_parser/parse.c", compile_extension=True)
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from pegen.parse import parse_string # type: ignore[import]
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tree = parse_string(program, mode=1)
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tree = _peg_parser.parse_string(program)
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if args.diff:
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a = tree
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b = ast.parse(program)
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b = _peg_parser.parse_string(program, oldparser=True)
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diff = diff_trees(a, b, args.verbose)
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if diff:
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for line in diff:
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@ -111,8 +107,8 @@ def main() -> None:
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print(f"# Parsed using {args.grammar_file}")
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print(format_tree(tree, args.verbose))
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else:
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tree = ast.parse(program)
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print("# Parse using ast.parse()")
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tree = _peg_parser.parse_string(program, oldparser=True)
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print("# Parse using the old parser")
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print(format_tree(tree, args.verbose))
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|
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@ -6,13 +6,14 @@ import os
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import sys
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import time
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import traceback
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import tokenize
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import _peg_parser
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from glob import glob
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from pathlib import PurePath
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from typing import List, Optional, Any
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sys.path.insert(0, os.getcwd())
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from pegen.build import build_c_parser_and_generator
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from pegen.ast_dump import ast_dump
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from pegen.testutil import print_memstats
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from scripts import show_parse
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@ -83,7 +84,7 @@ def compare_trees(
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actual_tree: ast.AST, file: str, verbose: bool, include_attributes: bool = False,
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) -> int:
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with open(file) as f:
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expected_tree = ast.parse(f.read())
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expected_tree = _peg_parser.parse_string(f.read(), oldparser=True)
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expected_text = ast_dump(expected_tree, include_attributes=include_attributes)
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actual_text = ast_dump(actual_tree, include_attributes=include_attributes)
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@ -121,7 +122,6 @@ def parse_directory(
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skip_actions: bool,
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tree_arg: int,
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short: bool,
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extension: Any,
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mode: int,
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parser: str,
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) -> int:
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@ -137,47 +137,21 @@ def parse_directory(
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if not os.path.exists(grammar_file):
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print(f"The specified grammar file, {grammar_file}, does not exist.", file=sys.stderr)
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return 1
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try:
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if not extension and parser == "pegen":
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build_c_parser_and_generator(
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grammar_file,
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tokens_file,
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"peg_extension/parse.c",
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compile_extension=True,
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skip_actions=skip_actions,
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)
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except Exception as err:
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print(
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f"{FAIL}The following error occurred when generating the parser. Please check your grammar file.\n{ENDC}",
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file=sys.stderr,
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)
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traceback.print_exception(err.__class__, err, None)
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return 1
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else:
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print(
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"A grammar file or a tokens file was not provided - attempting to use existing parser from stdlib...\n"
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)
|
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|
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if parser == "pegen":
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try:
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from peg_extension import parse # type: ignore
|
||||
except Exception as e:
|
||||
print(
|
||||
"An existing parser was not found. Please run `make` or specify a grammar file with the `-g` flag.",
|
||||
file=sys.stderr,
|
||||
)
|
||||
return 1
|
||||
if tree_arg:
|
||||
assert mode == 1, "Mode should be 1 (parse), when comparing the generated trees"
|
||||
|
||||
# For a given directory, traverse files and attempt to parse each one
|
||||
# - Output success/failure for each file
|
||||
errors = 0
|
||||
files = []
|
||||
trees = {} # Trees to compare (after everything else is done)
|
||||
total_seconds = 0
|
||||
|
||||
t0 = time.time()
|
||||
for file in sorted(glob(f"{directory}/**/*.py", recursive=True)):
|
||||
# Only attempt to parse Python files and files that are not excluded
|
||||
should_exclude_file = False
|
||||
|
|
@ -187,25 +161,31 @@ def parse_directory(
|
|||
break
|
||||
|
||||
if not should_exclude_file:
|
||||
with tokenize.open(file) as f:
|
||||
source = f.read()
|
||||
try:
|
||||
if tree_arg:
|
||||
mode = 1
|
||||
if parser == "cpython":
|
||||
with open(file, "r") as f:
|
||||
source = f.read()
|
||||
if mode == 2:
|
||||
compile(source, file, "exec")
|
||||
elif mode == 1:
|
||||
ast.parse(source, file, "exec")
|
||||
t0 = time.time()
|
||||
if mode == 2:
|
||||
result = _peg_parser.compile_string(
|
||||
source,
|
||||
filename=file,
|
||||
oldparser=parser == "cpython",
|
||||
)
|
||||
else:
|
||||
tree = parse.parse_file(file, mode=mode)
|
||||
result = _peg_parser.parse_string(
|
||||
source,
|
||||
filename=file,
|
||||
oldparser=parser == "cpython"
|
||||
)
|
||||
t1 = time.time()
|
||||
total_seconds += (t1 - t0)
|
||||
if tree_arg:
|
||||
trees[file] = tree
|
||||
trees[file] = result
|
||||
if not short:
|
||||
report_status(succeeded=True, file=file, verbose=verbose)
|
||||
except Exception as error:
|
||||
try:
|
||||
ast.parse(file)
|
||||
_peg_parser.parse_string(source, mode="exec", oldparser=True)
|
||||
except Exception:
|
||||
if not short:
|
||||
print(f"File {file} cannot be parsed by either pegen or the ast module.")
|
||||
|
|
@ -217,7 +197,6 @@ def parse_directory(
|
|||
files.append(file)
|
||||
t1 = time.time()
|
||||
|
||||
total_seconds = t1 - t0
|
||||
total_files = len(files)
|
||||
|
||||
total_bytes = 0
|
||||
|
|
@ -238,13 +217,6 @@ def parse_directory(
|
|||
f"or {total_bytes / total_seconds :,.0f} bytes/sec.",
|
||||
)
|
||||
|
||||
if parser == "pegen":
|
||||
# Dump memo stats to @data.
|
||||
with open("@data", "w") as datafile:
|
||||
for i, count in enumerate(parse.get_memo_stats()):
|
||||
if count:
|
||||
datafile.write(f"{i:4d} {count:9d}\n")
|
||||
|
||||
if short:
|
||||
print_memstats()
|
||||
|
||||
|
|
@ -275,6 +247,7 @@ def main() -> None:
|
|||
skip_actions = args.skip_actions
|
||||
tree = args.tree
|
||||
short = args.short
|
||||
mode = 1 if args.tree else 2
|
||||
sys.exit(
|
||||
parse_directory(
|
||||
directory,
|
||||
|
|
@ -285,8 +258,7 @@ def main() -> None:
|
|||
skip_actions,
|
||||
tree,
|
||||
short,
|
||||
None,
|
||||
0,
|
||||
mode,
|
||||
"pegen",
|
||||
)
|
||||
)
|
||||
|
|
|
|||
|
|
@ -54,7 +54,7 @@ def find_dirname(package_name: str) -> str:
|
|||
assert False # This is to fix mypy, should never be reached
|
||||
|
||||
|
||||
def run_tests(dirname: str, tree: int, extension: Any) -> int:
|
||||
def run_tests(dirname: str, tree: int) -> int:
|
||||
return test_parse_directory.parse_directory(
|
||||
dirname,
|
||||
HERE / ".." / ".." / ".." / "Grammar" / "python.gram",
|
||||
|
|
@ -72,7 +72,6 @@ def run_tests(dirname: str, tree: int, extension: Any) -> int:
|
|||
skip_actions=False,
|
||||
tree_arg=tree,
|
||||
short=True,
|
||||
extension=extension,
|
||||
mode=1,
|
||||
parser="pegen",
|
||||
)
|
||||
|
|
@ -82,13 +81,6 @@ def main() -> None:
|
|||
args = argparser.parse_args()
|
||||
tree = args.tree
|
||||
|
||||
extension = build.build_c_parser_and_generator(
|
||||
HERE / ".." / ".." / ".." / "Grammar" / "python.gram",
|
||||
HERE / ".." / ".." / ".." / "Grammar" / "Tokens",
|
||||
"peg_extension/parse.c",
|
||||
compile_extension=True,
|
||||
)
|
||||
|
||||
for package in get_packages():
|
||||
print(f"Extracting files from {package}... ", end="")
|
||||
try:
|
||||
|
|
@ -100,7 +92,7 @@ def main() -> None:
|
|||
|
||||
print(f"Trying to parse all python files ... ")
|
||||
dirname = find_dirname(package)
|
||||
status = run_tests(dirname, tree, extension)
|
||||
status = run_tests(dirname, tree)
|
||||
if status == 0:
|
||||
shutil.rmtree(dirname)
|
||||
else:
|
||||
|
|
|
|||
Loading…
Reference in New Issue