#
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"""SCons.Warnings

This file implements the warnings framework for SCons.

"""

__revision__ = "src/engine/SCons/Warnings.py 4043 2009/02/23 09:06:45 scons"

import string
import sys

import SCons.Errors

class Warning(SCons.Errors.UserError):
    pass

class MandatoryWarning(Warning):
    pass



class FutureDeprecatedWarning(Warning):
    pass

class DeprecatedWarning(Warning):
    pass

class MandatoryDeprecatedWarning(MandatoryWarning):
    pass



# NOTE:  If you add a new warning class, add it to the man page, too!

class CacheWriteErrorWarning(Warning):
    pass

class CorruptSConsignWarning(Warning):
    pass

class DependencyWarning(Warning):
    pass

class DeprecatedCopyWarning(DeprecatedWarning):
    pass

class DeprecatedOptionsWarning(DeprecatedWarning):
    pass

class DeprecatedSourceSignaturesWarning(DeprecatedWarning):
    pass

class DeprecatedTargetSignaturesWarning(DeprecatedWarning):
    pass

class DuplicateEnvironmentWarning(Warning):
    pass

class FutureReservedVariableWarning(Warning):
    pass

class LinkWarning(Warning):
    pass

class MisleadingKeywordsWarning(Warning):
    pass

class MissingSConscriptWarning(Warning):
    pass

class NoMD5ModuleWarning(Warning):
    pass

class NoMetaclassSupportWarning(Warning):
    pass

class NoObjectCountWarning(Warning):
    pass

class NoParallelSupportWarning(Warning):
    pass

class PythonVersionWarning(DeprecatedWarning):
    pass

class ReservedVariableWarning(Warning):
    pass

class StackSizeWarning(Warning):
    pass

class TaskmasterNeedsExecuteWarning(FutureDeprecatedWarning):
    pass

class FortranCxxMixWarning(LinkWarning):
    pass

_warningAsException = 0

# The below is a list of 2-tuples.  The first element is a class object.
# The second element is true if that class is enabled, false if it is disabled.
_enabled = []

_warningOut = None

def suppressWarningClass(clazz):
    """Suppresses all warnings that are of type clazz or
    derived from clazz."""
    _enabled.insert(0, (clazz, 0))

def enableWarningClass(clazz):
    """Suppresses all warnings that are of type clazz or
    derived from clazz."""
    _enabled.insert(0, (clazz, 1))

def warningAsException(flag=1):
    """Turn warnings into exceptions.  Returns the old value of the flag."""
    global _warningAsException
    old = _warningAsException
    _warningAsException = flag
    return old

def warn(clazz, *args):
    global _enabled, _warningAsException, _warningOut

    warning = clazz(args)
    for clazz, flag in _enabled:
        if isinstance(warning, clazz):
            if flag:
                if _warningAsException:
                    raise warning

                if _warningOut:
                    _warningOut(warning)
            break

def process_warn_strings(arguments):
    """Process string specifications of enabling/disabling warnings,
    as passed to the --warn option or the SetOption('warn') function.
    

    An argument to this option should be of the form <warning-class>
    or no-<warning-class>.  The warning class is munged in order
    to get an actual class name from the classes above, which we
    need to pass to the {enable,disable}WarningClass() functions.
    The supplied <warning-class> is split on hyphens, each element
    is capitalized, then smushed back together.  Then the string
    "Warning" is appended to get the class name.

    For example, 'deprecated' will enable the DeprecatedWarning
    class.  'no-dependency' will disable the .DependencyWarning
    class.

    As a special case, --warn=all and --warn=no-all will enable or
    disable (respectively) the base Warning class of all warnings.

    """

    def _capitalize(s):
        if s[:5] == "scons":
            return "SCons" + s[5:]
        else:
            return string.capitalize(s)

    for arg in arguments:

        elems = string.split(string.lower(arg), '-')
        enable = 1
        if elems[0] == 'no':
            enable = 0
            del elems[0]

        if len(elems) == 1 and elems[0] == 'all':
            class_name = "Warning"
        else:
            class_name = string.join(map(_capitalize, elems), '') + "Warning"
        try:
            clazz = globals()[class_name]
        except KeyError:
            sys.stderr.write("No warning type: '%s'\n" % arg)
        else:
            if enable:
                enableWarningClass(clazz)
            elif issubclass(clazz, MandatoryDeprecatedWarning):
                fmt = "Can not disable mandataory warning: '%s'\n"
                sys.stderr.write(fmt % arg)
            else:
                suppressWarningClass(clazz)

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