157 lines
4.5 KiB
Python
157 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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jishaku.repl.compilation
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~~~~~~~~~~~~~~~~~~~~~~~~
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Constants, functions and classes related to classifying, compiling and executing Python code.
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:copyright: (c) 2019 Devon (Gorialis) R
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:license: MIT, see LICENSE for more details.
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"""
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import ast
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import asyncio
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import inspect
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import sys
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import textwrap
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import import_expression
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from jishaku.functools import AsyncSender
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from jishaku.repl.scope import Scope
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from jishaku.repl.walkers import KeywordTransformer
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CORO_CODE = """
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async def _repl_coroutine({{0}}):
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import asyncio
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from importlib import import_module as {0}
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import aiohttp
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import discord
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from discord.ext import commands
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try:
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import jishaku
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except ImportError:
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jishaku = None # keep working even if in panic recovery mode
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try:
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pass
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{{1}}
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finally:
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if hasattr(jishaku, 'repl'):
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_async_executor = jishaku.repl.get_parent_var('async_executor', skip_frames=1)
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if _async_executor:
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_async_executor.scope.globals.update(locals())
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""".format(import_expression.constants.IMPORTER)
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def wrap_code(code: str, args: str = '') -> ast.Module:
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"""
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Compiles Python code into an async function or generator,
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and automatically adds return if the function body is a single evaluation.
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Also adds inline import expression support.
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"""
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if sys.version_info >= (3, 7):
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user_code = import_expression.parse(code, mode='exec')
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injected = ''
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else:
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injected = code
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mod = import_expression.parse(CORO_CODE.format(args, textwrap.indent(injected, ' ' * 8)), mode='exec')
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definition = mod.body[-1] # async def ...:
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assert isinstance(definition, ast.AsyncFunctionDef)
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try_block = definition.body[-1] # try:
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assert isinstance(try_block, ast.Try)
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if sys.version_info >= (3, 7):
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try_block.body.extend(user_code.body)
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else:
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ast.increment_lineno(mod, -16) # bring line numbers back in sync with repl
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ast.fix_missing_locations(mod)
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KeywordTransformer().generic_visit(try_block)
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last_expr = try_block.body[-1]
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# if the last part isn't an expression, ignore it
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if not isinstance(last_expr, ast.Expr):
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return mod
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# if the last expression is not a yield
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if not isinstance(last_expr.value, ast.Yield):
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# copy the value of the expression into a yield
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yield_stmt = ast.Yield(last_expr.value)
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ast.copy_location(yield_stmt, last_expr)
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# place the yield into its own expression
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yield_expr = ast.Expr(yield_stmt)
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ast.copy_location(yield_expr, last_expr)
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# place the yield where the original expression was
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try_block.body[-1] = yield_expr
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return mod
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class AsyncCodeExecutor: # pylint: disable=too-few-public-methods
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"""
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Executes/evaluates Python code inside of an async function or generator.
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Example
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-------
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.. code:: python3
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total = 0
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# prints 1, 2 and 3
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async for x in AsyncCodeExecutor('yield 1; yield 2; yield 3'):
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total += x
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print(x)
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# prints 6
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print(total)
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"""
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__slots__ = ('args', 'arg_names', 'code', 'loop', 'scope')
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def __init__(self, code: str, scope: Scope = None, arg_dict: dict = None, loop: asyncio.BaseEventLoop = None):
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self.args = []
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self.arg_names = []
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if arg_dict:
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for key, value in arg_dict.items():
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self.arg_names.append(key)
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self.args.append(value)
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self.code = wrap_code(code, args=', '.join(self.arg_names))
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self.scope = scope or Scope()
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self.loop = loop or asyncio.get_event_loop()
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def __aiter__(self):
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exec(compile(self.code, '<repl>', 'exec'), self.scope.globals, self.scope.locals) # pylint: disable=exec-used
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func_def = self.scope.locals.get('_repl_coroutine') or self.scope.globals['_repl_coroutine']
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return self.traverse(func_def)
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async def traverse(self, func):
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"""
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Traverses an async function or generator, yielding each result.
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This function is private. The class should be used as an iterator instead of using this method.
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"""
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# this allows the reference to be stolen
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async_executor = self
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if inspect.isasyncgenfunction(func):
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async for send, result in AsyncSender(func(*async_executor.args)):
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send((yield result))
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else:
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yield await func(*async_executor.args)
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