File size: 4,165 Bytes
1a0d68d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | # 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."""
import gast
import termcolor
class PrettyPrinter(gast.NodeVisitor):
"""Print AST nodes."""
def __init__(self, color, noanno):
self.indent_lvl = 0
self.result = ''
self.color = color
self.noanno = noanno
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):
# In very rare instances, a list can contain something other than a Node.
# e.g. Global contains a list of strings.
if isinstance(node, str):
if name:
self._print('%s%s="%s"' % (self._indent(), name, node))
else:
self._print('%s"%s"' % (self._indent(), node))
return
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 self.noanno and f.startswith('__'):
continue
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:
if n is not None:
self.generic_visit(n)
else:
self._print('%sNone' % (self._indent()))
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:
if n is not None:
self.generic_visit(n)
else:
self._print('%sNone' % (self._indent()))
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, bytes):
self._print('%s%s=%s' % (self._indent(), self._field(f),
self._value('b"%s"' % v)))
elif isinstance(v, str):
self._print('%s%s=%s' % (self._indent(), self._field(f),
self._value('u"%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, noanno=False):
printer = PrettyPrinter(color, noanno)
if isinstance(node, (list, tuple)):
for n in node:
printer.visit(n)
else:
printer.visit(node)
return printer.result
|