input.py 文件源码

def CheckedEval(file_contents):
  """Return the eval of a gyp file.

  The gyp file is restricted to dictionaries and lists only, and
  repeated keys are not allowed.

  Note that this is slower than eval() is.
  """

  ast = compiler.parse(file_contents)
  assert isinstance(ast, Module)
  c1 = ast.getChildren()
  assert c1[0] is None
  assert isinstance(c1[1], Stmt)
  c2 = c1[1].getChildren()
  assert isinstance(c2[0], Discard)
  c3 = c2[0].getChildren()
  assert len(c3) == 1
  return CheckNode(c3[0], [])