Staging
v0.5.1
v0.5.1
https://github.com/python/cpython
Revision 34900f8147a380dfebd35b34357b37275bb7e75d authored by Guido van Rossum on 15 August 1997, 02:52:20 UTC, committed by Guido van Rossum on 15 August 1997, 02:52:20 UTC
1 parent 7c14103
Tip revision: 34900f8147a380dfebd35b34357b37275bb7e75d authored by Guido van Rossum on 15 August 1997, 02:52:20 UTC
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Tip revision: 34900f8
code.py
"""Utilities dealing with code objects."""
def compile_command(source, filename="<input>", symbol="single"):
r"""Compile a command and determine whether it is incomplete.
Arguments:
source -- the source string; may contain \n characters
filename -- optional filename from which source was read; default "<input>"
symbol -- optional grammar start symbol; "single" (default) or "eval"
Return value / exception raised:
- Return a code object if the command is complete and valid
- Return None if the command is incomplete
- Raise SyntaxError if the command is a syntax error
Approach:
Compile three times: as is, with \n, and with \n\n appended. If
it compiles as is, it's complete. If it compiles with one \n
appended, we expect more. If it doesn't compile either way, we
compare the error we get when compiling with \n or \n\n appended.
If the errors are the same, the code is broken. But if the errors
are different, we expect more. Not intuitive; not even guaranteed
to hold in future releases; but this matches the compiler's
behavior in Python 1.4 and 1.5.
"""
err = err1 = err2 = None
code = code1 = code2 = None
try:
code = compile(source, filename, symbol)
except SyntaxError, err:
pass
try:
code1 = compile(source + "\n", filename, symbol)
except SyntaxError, err1:
pass
try:
code2 = compile(source + "\n\n", filename, symbol)
except SyntaxError, err2:
pass
if code:
return code
if not code1 and err1 == err2:
raise SyntaxError, err1
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