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"""SCons.Warnings

This file implements the warnings framework for SCons.

"""

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import sys

import SCons.Errors

class Warning(SCons.Errors.UserError):
    pass

class WarningOnByDefault(Warning):
    pass


# NOTE:  If you add a new warning class, add it to the man page, too!
class TargetNotBuiltWarning(Warning): # Should go to OnByDefault
    pass

class CacheVersionWarning(WarningOnByDefault):
    pass

class CacheWriteErrorWarning(Warning):
    pass

class CorruptSConsignWarning(WarningOnByDefault):
    pass

class DependencyWarning(Warning):
    pass

class DevelopmentVersionWarning(WarningOnByDefault):
    pass

class DuplicateEnvironmentWarning(WarningOnByDefault):
    pass

class FutureReservedVariableWarning(WarningOnByDefault):
    pass

class LinkWarning(WarningOnByDefault):
    pass

class MisleadingKeywordsWarning(WarningOnByDefault):
    pass

class MissingSConscriptWarning(WarningOnByDefault):
    pass

class NoObjectCountWarning(WarningOnByDefault):
    pass

class NoParallelSupportWarning(WarningOnByDefault):
    pass

class ReservedVariableWarning(WarningOnByDefault):
    pass

class StackSizeWarning(WarningOnByDefault):
    pass

class VisualCMissingWarning(WarningOnByDefault):
    pass

# Used when MSVC_VERSION and MSVS_VERSION do not point to the
# same version (MSVS_VERSION is deprecated)
class VisualVersionMismatch(WarningOnByDefault):
    pass

class VisualStudioMissingWarning(Warning):
    pass

class FortranCxxMixWarning(LinkWarning):
    pass


# Deprecation warnings

class FutureDeprecatedWarning(Warning):
    pass

class DeprecatedWarning(Warning):
    pass

class MandatoryDeprecatedWarning(DeprecatedWarning):
    pass


# Special case; base always stays DeprecatedWarning
class PythonVersionWarning(DeprecatedWarning):
    pass

class DeprecatedSourceCodeWarning(FutureDeprecatedWarning):
    pass

class TaskmasterNeedsExecuteWarning(DeprecatedWarning):
    pass

class DeprecatedOptionsWarning(MandatoryDeprecatedWarning):
    pass

class DeprecatedDebugOptionsWarning(MandatoryDeprecatedWarning):
    pass

class DeprecatedMissingSConscriptWarning(DeprecatedWarning):
    pass


# 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 = []

# If set, raise the warning as an exception
_warningAsException = 0

# If not None, a function to call with the warning
_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):
    """Enables 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 cls, flag in _enabled:
        if isinstance(warning, cls):
            if flag:
                if _warningAsException:
                    raise warning

                if _warningOut:
                    _warningOut(warning)
            break

def process_warn_strings(arguments):
    """Process requests to enable/disable warnings.

    The requests are strings 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 s.capitalize()

    for arg in arguments:

        elems = arg.lower().split('-')
        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 = ''.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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