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r"""Utilities to compile possibly incomplete Python source code.

This module provides two interfaces, broadly similar to the builtin

function compile(), which take program text, a filename and a 'mode'

and:

- Return code object if the command is complete and valid

- Return None if the command is incomplete

- Raise SyntaxError, ValueError or OverflowError if the command is a

syntax error (OverflowError and ValueError can be produced by

malformed literals).

Approach:

First, check if the source consists entirely of blank lines and

comments; if so, replace it with 'pass', because the built-in

parser doesn't always do the right thing for these.

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 from Python 1.4

through 2.2, at least.

Caveat:

It is possible (but not likely) that the parser stops parsing with a

successful outcome before reaching the end of the source; in this

case, trailing symbols may be ignored instead of causing an error.

For example, a backslash followed by two newlines may be followed by

arbitrary garbage. This will be fixed once the API for the parser is

better.

The two interfaces are:

compile_command(source, filename, symbol):

Compiles a single command in the manner described above.

CommandCompiler():

Instances of this class have __call__ methods identical in

signature to compile_command; the difference is that if the

instance compiles program text containing a __future__ statement,

the instance 'remembers' and compiles all subsequent program texts

with the statement in force.

The module also provides another class:

Compile():

Instances of this class act like the built-in function compile,

but with 'memory' in the sense described above.

"""

import __future__

import warnings

_features = [getattr(__future__, fname)

for fname in __future__.all_feature_names]

__all__ = ["compile_command", "Compile", "CommandCompiler"]

PyCF_DONT_IMPLY_DEDENT = 0x200 # Matches pythonrun.h

def _maybe_compile(compiler, source, filename, symbol):

# Check for source consisting of only blank lines and comments

for line in source.split("\n"):

line = line.strip()

if line and line[0] != '#':

break # Leave it alone

else:

if symbol != "eval":

source = "pass" # Replace it with a 'pass' statement

err = err1 = err2 = None

code = code1 = code2 = None

try:

code = compiler(source, filename, symbol)

except SyntaxError:

pass

# Catch syntax warnings after the first compile

# to emit warnings (SyntaxWarning, DeprecationWarning) at most once.

with warnings.catch_warnings():

warnings.simplefilter("error")

try:

code1 = compiler(source + "\n", filename, symbol)

except SyntaxError as e:

err1 = e

try:

code2 = compiler(source + "\n\n", filename, symbol)

except SyntaxError as e:

err2 = e

try:

if code:

return code

if not code1 and repr(err1) == repr(err2):

raise err1

finally:

err1 = err2 = None

def _compile(source, filename, symbol):

return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT)

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), "exec"

or "eval"

Return value / exceptions raised:

- Return a code object if the command is complete and valid

- Return None if the command is incomplete

- Raise SyntaxError, ValueError or OverflowError if the command is a

syntax error (OverflowError and ValueError can be produced by

malformed literals).

"""

return _maybe_compile(_compile, source, filename, symbol)

class Compile:

"""Instances of this class behave much like the built-in compile

function, but if one is used to compile text containing a future

statement, it "remembers" and compiles all subsequent program texts

with the statement in force."""

def __init__(self):

self.flags = PyCF_DONT_IMPLY_DEDENT

def __call__(self, source, filename, symbol):

codeob = compile(source, filename, symbol, self.flags, True)

for feature in _features:

if codeob.co_flags & feature.compiler_flag:

self.flags |= feature.compiler_flag

return codeob

class CommandCompiler:

"""Instances of this class have __call__ methods identical in

signature to compile_command; the difference is that if the

instance compiles program text containing a __future__ statement,

the instance 'remembers' and compiles all subsequent program texts

with the statement in force."""

def __init__(self,):

self.compiler = Compile()

def __call__(self, 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 / exceptions raised:

- Return a code object if the command is complete and valid

- Return None if the command is incomplete

- Raise SyntaxError, ValueError or OverflowError if the command is a

syntax error (OverflowError and ValueError can be produced by

malformed literals).

"""

return _maybe_compile(self.compiler, source, filename, symbol)

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