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+#############################################################################
+##
+## Copyright (C) 2020 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python project.
+##
+## $QT_BEGIN_LICENSE:LGPL$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU Lesser General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU Lesser
+## General Public License version 3 as published by the Free Software
+## Foundation and appearing in the file LICENSE.LGPL3 included in the
+## packaging of this file. Please review the following information to
+## ensure the GNU Lesser General Public License version 3 requirements
+## will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 2.0 or (at your option) the GNU General
+## Public license version 3 or any later version approved by the KDE Free
+## Qt Foundation. The licenses are as published by the Free Software
+## Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-2.0.html and
+## https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""Tool to dump a Python AST"""
+
+
+from argparse import ArgumentParser, RawTextHelpFormatter
+import ast
+from enum import Enum
+import sys
+import tokenize
+
+
+from nodedump import debug_format_node
+
+DESCRIPTION = "Tool to dump a Python AST"
+
+
+_source_lines = []
+_opt_verbose = False
+
+
+def first_non_space(s):
+ for i, c in enumerate(s):
+ if c != ' ':
+ return i
+ return 0
+
+
+class NodeType(Enum):
+ IGNORE = 1
+ PRINT_ONE_LINE = 2 # Print as a one liner, do not visit children
+ PRINT = 3 # Print with opening closing tag, visit children
+ PRINT_WITH_SOURCE = 4 # Like PRINT, but print source line above
+
+
+def get_node_type(node):
+ if isinstance(node, (ast.Load, ast.Store, ast.Delete)):
+ return NodeType.IGNORE
+ if isinstance(node, (ast.Add, ast.alias, ast.arg, ast.Eq, ast.Gt, ast.Lt,
+ ast.Mult, ast.Name, ast.NotEq, ast.NameConstant, ast.Not,
+ ast.Num, ast.Str)):
+ return NodeType.PRINT_ONE_LINE
+ if not hasattr(node, 'lineno'):
+ return NodeType.PRINT
+ if isinstance(node, (ast.Attribute)):
+ return NodeType.PRINT_ONE_LINE if isinstance(node.value, ast.Name) else NodeType.PRINT
+ return NodeType.PRINT_WITH_SOURCE
+
+
+class DumpVisitor(ast.NodeVisitor):
+ def __init__(self):
+ ast.NodeVisitor.__init__(self)
+ self._indent = 0
+ self._printed_source_lines = {-1}
+
+ def generic_visit(self, node):
+ node_type = get_node_type(node)
+ if _opt_verbose and node_type in (NodeType.IGNORE, NodeType.PRINT_ONE_LINE):
+ node_type = NodeType.PRINT
+ if node_type == NodeType.IGNORE:
+ return
+ self._indent = self._indent + 1
+ indent = ' ' * self._indent
+
+ if node_type == NodeType.PRINT_WITH_SOURCE:
+ line_number = node.lineno - 1
+ if line_number not in self._printed_source_lines:
+ self._printed_source_lines.add(line_number)
+ line = _source_lines[line_number]
+ non_space = first_non_space(line)
+ print('{:04d} {}{}'.format(line_number, '_' * non_space,
+ line[non_space:]))
+
+ if node_type == NodeType.PRINT_ONE_LINE:
+ print(indent, debug_format_node(node))
+ else:
+ print(indent, '>', debug_format_node(node))
+ ast.NodeVisitor.generic_visit(self, node)
+ print(indent, '<', type(node).__name__)
+
+ self._indent = self._indent - 1
+
+
+def parse_ast(filename):
+ node = None
+ with tokenize.open(filename) as f:
+ global _source_lines
+ source = f.read()
+ _source_lines = source.split('\n')
+ node = ast.parse(source, mode="exec")
+ return node
+
+
+def create_arg_parser(desc):
+ parser = ArgumentParser(description=desc,
+ formatter_class=RawTextHelpFormatter)
+ parser.add_argument('--verbose', '-v', action='store_true',
+ help='Verbose')
+ parser.add_argument('source', type=str, help='Python source')
+ return parser
+
+
+if __name__ == '__main__':
+ arg_parser = create_arg_parser(DESCRIPTION)
+ options = arg_parser.parse_args()
+ _opt_verbose = options.verbose
+ title = f'AST tree for {options.source}'
+ print('=' * len(title))
+ print(title)
+ print('=' * len(title))
+ tree = parse_ast(options.source)
+ DumpVisitor().visit(tree)