# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT license.
import sys
from textworld import Agent
prompt_toolkit_available = False
try:
# For command line history and autocompletion.
from prompt_toolkit import prompt
from prompt_toolkit.completion import WordCompleter
from prompt_toolkit.history import InMemoryHistory
prompt_toolkit_available = sys.stdout.isatty()
except ImportError:
pass
try:
# For command line history when prompt_toolkit is not available.
import readline # noqa: F401
except ImportError:
pass
[docs]class HumanAgent(Agent):
def __init__(self, autocompletion=False, walkthrough=False):
self.autocompletion = autocompletion
self.walkthrough = walkthrough
self._history = None
if prompt_toolkit_available:
self._history = InMemoryHistory()
[docs] def reset(self, env):
# Commands typed by the player are already displayed.
env.display_command_during_render = False
if self.autocompletion:
env.infos.admissible_commands = True
if self.walkthrough:
env.infos.policy_commands = True
[docs] def act(self, game_state, reward, done):
if (self.walkthrough and game_state.intermediate_reward and len(game_state.policy_commands) > 0 and not done):
text = '[{score:02.1%}|({intermediate_score}): {policy}]\n'.format(
score=game_state.score,
intermediate_score=game_state.intermediate_reward,
policy=" > ".join(game_state.policy_commands)
)
print("Walkthrough: {}\n".format(text))
if prompt_toolkit_available:
actions_completer = None
if self.autocompletion and game_state.admissible_commands:
actions_completer = WordCompleter(game_state.admissible_commands,
ignore_case=True, sentence=True)
action = prompt('> ', completer=actions_completer,
history=self._history, enable_history_search=True)
else:
if self.autocompletion and game_state.admissible_commands:
print("Available actions: {}\n".format(game_state.admissible_commands))
action = input('> ')
return action