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from hamcrest.core.base_matcher import BaseMatcher 
from hamcrest.core.helpers.hasmethod import hasmethod 
from hamcrest.core.helpers.wrap_matcher import wrap_matcher 
 
__author__ = "Jon Reid" 
__copyright__ = "Copyright 2011 hamcrest.org" 
__license__ = "BSD, see License.txt" 
 
 
class IsDictContainingValue(BaseMatcher): 
 
    def __init__(self, value_matcher): 
        self.value_matcher = value_matcher 
 
    def _matches(self, dictionary): 
        if hasmethod(dictionary, 'values'): 
            for value in dictionary.values(): 
                if self.value_matcher.matches(value): 
                    return True 
        return False 
 
    def describe_to(self, description): 
        description.append_text('a dictionary containing value ')   \ 
                    .append_description_of(self.value_matcher) 
 
 
def has_value(value): 
    """Matches if dictionary contains an entry whose value satisfies a given 
    matcher. 
 
    :param value_match: The matcher to satisfy for the value, or an expected 
        value for :py:func:`~hamcrest.core.core.isequal.equal_to` matching. 
 
    This matcher iterates the evaluated dictionary, searching for any key-value 
    entry whose value satisfies the given matcher. If a matching entry is 
    found, ``has_value`` is satisfied. 
 
    Any argument that is not a matcher is implicitly wrapped in an 
    :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for 
    equality. 
 
    Examples:: 
 
        has_value(equal_to('bar')) 
        has_value('bar') 
 
    """ 
    return IsDictContainingValue(wrap_matcher(value))