mirror of https://github.com/python/cpython
116 lines
2.7 KiB
Python
116 lines
2.7 KiB
Python
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import string
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import sys
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import traceback
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try:
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sys.ps1
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except AttributeError:
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sys.ps1 = ">>> "
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try:
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sys.ps2
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except AttributeError:
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sys.ps2 = "... "
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def print_exc(limit=None, file=None):
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if not file:
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file = sys.stderr
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# we're going to skip the outermost traceback object, we don't
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# want people to see the line which excecuted their code.
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tb = sys.exc_traceback
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if tb:
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tb = tb.tb_next
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try:
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sys.last_type = sys.exc_type
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sys.last_value = sys.exc_value
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sys.last_traceback = tb
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traceback.print_exception(sys.last_type, sys.last_value,
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sys.last_traceback, limit, file)
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except:
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print '--- hola! ---'
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traceback.print_exception(sys.exc_type, sys.exc_value,
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sys.exc_traceback, limit, file)
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class PyInteractive:
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def __init__(self):
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self._pybuf = ""
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def executeline(self, stuff, out = None, env = None):
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if env is None:
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import __main__
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env = __main__.__dict__
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if out:
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saveerr, saveout = sys.stderr, sys.stdout
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sys.stderr = sys.stdout = out
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try:
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if self._pybuf:
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self._pybuf = self._pybuf + '\n' + stuff
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else:
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self._pybuf = stuff
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# Compile three times: as is, with \n, and with \n\n appended.
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# If it compiles as is, it's complete. If it compiles with
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# one \n appended, we expect more. If it doesn't compile
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# either way, we compare the error we get when compiling with
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# \n or \n\n appended. If the errors are the same, the code
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# is broken. But if the errors are different, we expect more.
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# Not intuitive; not even guaranteed to hold in future
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# releases; but this matches the compiler's behavior in Python
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# 1.4 and 1.5.
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err = err1 = err2 = None
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code = code1 = code2 = None
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# quickly get out of here when the line is 'empty' or is a comment
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stripped = string.strip(self._pybuf)
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if not stripped or stripped[0] == '#':
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self._pybuf = ''
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sys.stdout.write(sys.ps1)
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sys.stdout.flush()
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return
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try:
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code = compile(self._pybuf, "<input>", "single")
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except SyntaxError, err:
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pass
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except:
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# OverflowError. More?
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print_exc()
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self._pybuf = ""
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sys.stdout.write(sys.ps1)
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sys.stdout.flush()
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return
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try:
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code1 = compile(self._pybuf + "\n", "<input>", "single")
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except SyntaxError, err1:
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pass
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try:
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code2 = compile(self._pybuf + "\n\n", "<input>", "single")
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except SyntaxError, err2:
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pass
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if code:
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try:
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exec code in env
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except:
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print_exc()
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self._pybuf = ""
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elif code1:
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pass
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elif err1 == err2 or (not stuff and self._pybuf):
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print_exc()
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self._pybuf = ""
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if self._pybuf:
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sys.stdout.write(sys.ps2)
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sys.stdout.flush()
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else:
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sys.stdout.write(sys.ps1)
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sys.stdout.flush()
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finally:
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if out:
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sys.stderr, sys.stdout = saveerr, saveout
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