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