code: def evalexpr(self, tokens):
      # tokens = tokenize(line)
      # Search for defined macros
      i = 0
      while i < len(tokens):
          if (
              tokens[i].type == self.t_ID
              and tokens[i].value == "defined"
          ):
              j = i + 1
              needparen = False
              result = "0L"
              while j < len(tokens):
                  if tokens[j].type in self.t_WS:
                      j += 1
                      continue
                  elif tokens[j].type == self.t_ID:
                      if tokens[j].value in self.macros:
                          result = "1L"
                      else:
                          result = "0L"
                      if not needparen:
                          break
                  elif tokens[j].value == "(":
                      needparen = True
                  elif tokens[j].value == ")":
                      break
                  else:
                      self.error(
                          self.source,
                          tokens[i].lineno,
                          "Malformed defined()",
                      )
                  j += 1
              tokens[i].type = self.t_INTEGER
              tokens[i].value = self.t_INTEGER_TYPE(result)
              del tokens[i + 1 : j + 1]
          i += 1
      tokens = self.expand_macros(tokens)
      for i, t in enumerate(tokens):
          if t.type == self.t_ID:
              tokens[i] = copy.copy(t)
              tokens[i].type = self.t_INTEGER
              tokens[i].value = self.t_INTEGER_TYPE("0L")
          elif t.type == self.t_INTEGER:
              tokens[i] = copy.copy(t)
              # Strip off any trailing suffixes
              tokens[i].value = str(tokens[i].value)
              while tokens[i].value[-1] not in "0123456789abcdefABCDEF":
                  tokens[i].value = tokens[i].value[:-1]
  
      expr = "".join([str(x.value) for x in tokens])
      expr = expr.replace("&&", " and ")
      expr = expr.replace("||", " or ")
      expr = expr.replace("!", " not ")
      try:
          result = eval(expr)
      except Exception:
          self.error(
              self.source,
              tokens[0].lineno,
              "Couldn't evaluate expression",
          )
          result = 0
      return result
  
imports: import sys
  import re
  import copy
  import time
  import os.path
label_desc: Use image node_id 12 for calling the Preprocessor obj's underlying member method code with example usage: obj.evalexpr(tokens) and returns: result