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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Print an AST tree in a form more readable than ast.dump."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import gast
import termcolor
class PrettyPrinter(gast.NodeVisitor):
"""Print AST nodes."""
def __init__(self, color):
self.indent_lvl = 0
self.result = ''
self.color = color
def _color(self, string, color, attrs=None):
if self.color:
return termcolor.colored(string, color, attrs=attrs)
return string
def _type(self, node):
return self._color(node.__class__.__name__, None, ['bold'])
def _field(self, name):
return self._color(name, 'blue')
def _value(self, name):
return self._color(name, 'magenta')
def _warning(self, name):
return self._color(name, 'red')
def _indent(self):
return self._color('| ' * self.indent_lvl, None, ['dark'])
def _print(self, s):
self.result += s
self.result += '\n'
def generic_visit(self, node, name=None):
if node._fields:
cont = ':'
else:
cont = '()'
if name:
self._print('%s%s=%s%s' % (self._indent(), self._field(name),
self._type(node), cont))
else:
self._print('%s%s%s' % (self._indent(), self._type(node), cont))
self.indent_lvl += 1
for f in node._fields:
if not hasattr(node, f):
self._print('%s%s' % (self._indent(), self._warning('%s=<unset>' % f)))
continue
v = getattr(node, f)
if isinstance(v, list):
if v:
self._print('%s%s=[' % (self._indent(), self._field(f)))
self.indent_lvl += 1
for n in v:
self.generic_visit(n)
self.indent_lvl -= 1
self._print('%s]' % (self._indent()))
else:
self._print('%s%s=[]' % (self._indent(), self._field(f)))
elif isinstance(v, tuple):
if v:
self._print('%s%s=(' % (self._indent(), self._field(f)))
self.indent_lvl += 1
for n in v:
self.generic_visit(n)
self.indent_lvl -= 1
self._print('%s)' % (self._indent()))
else:
self._print('%s%s=()' % (self._indent(), self._field(f)))
elif isinstance(v, gast.AST):
self.generic_visit(v, f)
elif isinstance(v, str):
self._print('%s%s=%s' % (self._indent(), self._field(f),
self._value('"%s"' % v)))
else:
self._print('%s%s=%s' % (self._indent(), self._field(f),
self._value(v)))
self.indent_lvl -= 1
def fmt(node, color=True):
printer = PrettyPrinter(color)
if isinstance(node, (list, tuple)):
for n in node:
printer.visit(n)
else:
printer.visit(node)
return printer.result
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