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__all__ = ['BaseRepresenter', 'SafeRepresenter', 'Representer', 

    'RepresenterError'] 

 

from error import * 

from nodes import * 

 

import datetime 

 

import sys, copy_reg, types 

 

class RepresenterError(YAMLError): 

    pass 

 

class BaseRepresenter(object): 

 

    yaml_representers = {} 

    yaml_multi_representers = {} 

 

    def __init__(self, default_style=None, default_flow_style=None): 

        self.default_style = default_style 

        self.default_flow_style = default_flow_style 

        self.represented_objects = {} 

        self.object_keeper = [] 

        self.alias_key = None 

 

    def represent(self, data): 

        node = self.represent_data(data) 

        self.serialize(node) 

        self.represented_objects = {} 

        self.object_keeper = [] 

        self.alias_key = None 

 

    def get_classobj_bases(self, cls): 

        bases = [cls] 

        for base in cls.__bases__: 

            bases.extend(self.get_classobj_bases(base)) 

        return bases 

 

    def represent_data(self, data): 

        if self.ignore_aliases(data): 

            self.alias_key = None 

        else: 

            self.alias_key = id(data) 

        if self.alias_key is not None: 

            if self.alias_key in self.represented_objects: 

                node = self.represented_objects[self.alias_key] 

                #if node is None: 

                #    raise RepresenterError("recursive objects are not allowed: %r" % data) 

                return node 

            #self.represented_objects[alias_key] = None 

            self.object_keeper.append(data) 

        data_types = type(data).__mro__ 

        if type(data) is types.InstanceType: 

            data_types = self.get_classobj_bases(data.__class__)+list(data_types) 

        if data_types[0] in self.yaml_representers: 

            node = self.yaml_representers[data_types[0]](self, data) 

        else: 

            for data_type in data_types: 

                if data_type in self.yaml_multi_representers: 

                    node = self.yaml_multi_representers[data_type](self, data) 

                    break 

            else: 

                if None in self.yaml_multi_representers: 

                    node = self.yaml_multi_representers[None](self, data) 

                elif None in self.yaml_representers: 

                    node = self.yaml_representers[None](self, data) 

                else: 

                    node = ScalarNode(None, unicode(data)) 

        #if alias_key is not None: 

        #    self.represented_objects[alias_key] = node 

        return node 

 

    def add_representer(cls, data_type, representer): 

        if not 'yaml_representers' in cls.__dict__: 

            cls.yaml_representers = cls.yaml_representers.copy() 

        cls.yaml_representers[data_type] = representer 

    add_representer = classmethod(add_representer) 

 

    def add_multi_representer(cls, data_type, representer): 

        if not 'yaml_multi_representers' in cls.__dict__: 

            cls.yaml_multi_representers = cls.yaml_multi_representers.copy() 

        cls.yaml_multi_representers[data_type] = representer 

    add_multi_representer = classmethod(add_multi_representer) 

 

    def represent_scalar(self, tag, value, style=None): 

        if style is None: 

            style = self.default_style 

        node = ScalarNode(tag, value, style=style) 

        if self.alias_key is not None: 

            self.represented_objects[self.alias_key] = node 

        return node 

 

    def represent_sequence(self, tag, sequence, flow_style=None): 

        value = [] 

        node = SequenceNode(tag, value, flow_style=flow_style) 

        if self.alias_key is not None: 

            self.represented_objects[self.alias_key] = node 

        best_style = True 

        for item in sequence: 

            node_item = self.represent_data(item) 

            if not (isinstance(node_item, ScalarNode) and not node_item.style): 

                best_style = False 

            value.append(node_item) 

        if flow_style is None: 

            if self.default_flow_style is not None: 

                node.flow_style = self.default_flow_style 

            else: 

                node.flow_style = best_style 

        return node 

 

    def represent_mapping(self, tag, mapping, flow_style=None): 

        value = [] 

        node = MappingNode(tag, value, flow_style=flow_style) 

        if self.alias_key is not None: 

            self.represented_objects[self.alias_key] = node 

        best_style = True 

        if hasattr(mapping, 'items'): 

            mapping = mapping.items() 

            mapping.sort() 

        for item_key, item_value in mapping: 

            node_key = self.represent_data(item_key) 

            node_value = self.represent_data(item_value) 

            if not (isinstance(node_key, ScalarNode) and not node_key.style): 

                best_style = False 

            if not (isinstance(node_value, ScalarNode) and not node_value.style): 

                best_style = False 

            value.append((node_key, node_value)) 

        if flow_style is None: 

            if self.default_flow_style is not None: 

                node.flow_style = self.default_flow_style 

            else: 

                node.flow_style = best_style 

        return node 

 

    def ignore_aliases(self, data): 

        return False 

 

class SafeRepresenter(BaseRepresenter): 

 

    def ignore_aliases(self, data): 

        if data in [None, ()]: 

            return True 

        if isinstance(data, (str, unicode, bool, int, float)): 

            return True 

 

    def represent_none(self, data): 

        return self.represent_scalar(u'tag:yaml.org,2002:null', 

                u'null') 

 

    def represent_str(self, data): 

        tag = None 

        style = None 

        try: 

            data = unicode(data, 'ascii') 

            tag = u'tag:yaml.org,2002:str' 

        except UnicodeDecodeError: 

            try: 

                data = unicode(data, 'utf-8') 

                tag = u'tag:yaml.org,2002:str' 

            except UnicodeDecodeError: 

                data = data.encode('base64') 

                tag = u'tag:yaml.org,2002:binary' 

                style = '|' 

        return self.represent_scalar(tag, data, style=style) 

 

    def represent_unicode(self, data): 

        return self.represent_scalar(u'tag:yaml.org,2002:str', data) 

 

    def represent_bool(self, data): 

        if data: 

            value = u'true' 

        else: 

            value = u'false' 

        return self.represent_scalar(u'tag:yaml.org,2002:bool', value) 

 

    def represent_int(self, data): 

        return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data)) 

 

    def represent_long(self, data): 

        return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data)) 

 

    inf_value = 1e300 

    while repr(inf_value) != repr(inf_value*inf_value): 

        inf_value *= inf_value 

 

    def represent_float(self, data): 

        if data != data or (data == 0.0 and data == 1.0): 

            value = u'.nan' 

        elif data == self.inf_value: 

            value = u'.inf' 

        elif data == -self.inf_value: 

            value = u'-.inf' 

        else: 

            value = unicode(repr(data)).lower() 

            # Note that in some cases `repr(data)` represents a float number 

            # without the decimal parts.  For instance: 

            #   >>> repr(1e17) 

            #   '1e17' 

            # Unfortunately, this is not a valid float representation according 

            # to the definition of the `!!float` tag.  We fix this by adding 

            # '.0' before the 'e' symbol. 

            if u'.' not in value and u'e' in value: 

                value = value.replace(u'e', u'.0e', 1) 

        return self.represent_scalar(u'tag:yaml.org,2002:float', value) 

 

    def represent_list(self, data): 

        #pairs = (len(data) > 0 and isinstance(data, list)) 

        #if pairs: 

        #    for item in data: 

        #        if not isinstance(item, tuple) or len(item) != 2: 

        #            pairs = False 

        #            break 

        #if not pairs: 

            return self.represent_sequence(u'tag:yaml.org,2002:seq', data) 

        #value = [] 

        #for item_key, item_value in data: 

        #    value.append(self.represent_mapping(u'tag:yaml.org,2002:map', 

        #        [(item_key, item_value)])) 

        #return SequenceNode(u'tag:yaml.org,2002:pairs', value) 

 

    def represent_dict(self, data): 

        return self.represent_mapping(u'tag:yaml.org,2002:map', data) 

 

    def represent_set(self, data): 

        value = {} 

        for key in data: 

            value[key] = None 

        return self.represent_mapping(u'tag:yaml.org,2002:set', value) 

 

    def represent_date(self, data): 

        value = unicode(data.isoformat()) 

        return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value) 

 

    def represent_datetime(self, data): 

        value = unicode(data.isoformat(' ')) 

        return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value) 

 

    def represent_yaml_object(self, tag, data, cls, flow_style=None): 

        if hasattr(data, '__getstate__'): 

            state = data.__getstate__() 

        else: 

            state = data.__dict__.copy() 

        return self.represent_mapping(tag, state, flow_style=flow_style) 

 

    def represent_undefined(self, data): 

        raise RepresenterError("cannot represent an object: %s" % data) 

 

SafeRepresenter.add_representer(type(None), 

        SafeRepresenter.represent_none) 

 

SafeRepresenter.add_representer(str, 

        SafeRepresenter.represent_str) 

 

SafeRepresenter.add_representer(unicode, 

        SafeRepresenter.represent_unicode) 

 

SafeRepresenter.add_representer(bool, 

        SafeRepresenter.represent_bool) 

 

SafeRepresenter.add_representer(int, 

        SafeRepresenter.represent_int) 

 

SafeRepresenter.add_representer(long, 

        SafeRepresenter.represent_long) 

 

SafeRepresenter.add_representer(float, 

        SafeRepresenter.represent_float) 

 

SafeRepresenter.add_representer(list, 

        SafeRepresenter.represent_list) 

 

SafeRepresenter.add_representer(tuple, 

        SafeRepresenter.represent_list) 

 

SafeRepresenter.add_representer(dict, 

        SafeRepresenter.represent_dict) 

 

SafeRepresenter.add_representer(set, 

        SafeRepresenter.represent_set) 

 

SafeRepresenter.add_representer(datetime.date, 

        SafeRepresenter.represent_date) 

 

SafeRepresenter.add_representer(datetime.datetime, 

        SafeRepresenter.represent_datetime) 

 

SafeRepresenter.add_representer(None, 

        SafeRepresenter.represent_undefined) 

 

class Representer(SafeRepresenter): 

 

    def represent_str(self, data): 

        tag = None 

        style = None 

        try: 

            data = unicode(data, 'ascii') 

            tag = u'tag:yaml.org,2002:str' 

        except UnicodeDecodeError: 

            try: 

                data = unicode(data, 'utf-8') 

                tag = u'tag:yaml.org,2002:python/str' 

            except UnicodeDecodeError: 

                data = data.encode('base64') 

                tag = u'tag:yaml.org,2002:binary' 

                style = '|' 

        return self.represent_scalar(tag, data, style=style) 

 

    def represent_unicode(self, data): 

        tag = None 

        try: 

            data.encode('ascii') 

            tag = u'tag:yaml.org,2002:python/unicode' 

        except UnicodeEncodeError: 

            tag = u'tag:yaml.org,2002:str' 

        return self.represent_scalar(tag, data) 

 

    def represent_long(self, data): 

        tag = u'tag:yaml.org,2002:int' 

        if int(data) is not data: 

            tag = u'tag:yaml.org,2002:python/long' 

        return self.represent_scalar(tag, unicode(data)) 

 

    def represent_complex(self, data): 

        if data.imag == 0.0: 

            data = u'%r' % data.real 

        elif data.real == 0.0: 

            data = u'%rj' % data.imag 

        elif data.imag > 0: 

            data = u'%r+%rj' % (data.real, data.imag) 

        else: 

            data = u'%r%rj' % (data.real, data.imag) 

        return self.represent_scalar(u'tag:yaml.org,2002:python/complex', data) 

 

    def represent_tuple(self, data): 

        return self.represent_sequence(u'tag:yaml.org,2002:python/tuple', data) 

 

    def represent_name(self, data): 

        name = u'%s.%s' % (data.__module__, data.__name__) 

        return self.represent_scalar(u'tag:yaml.org,2002:python/name:'+name, u'') 

 

    def represent_module(self, data): 

        return self.represent_scalar( 

                u'tag:yaml.org,2002:python/module:'+data.__name__, u'') 

 

    def represent_instance(self, data): 

        # For instances of classic classes, we use __getinitargs__ and 

        # __getstate__ to serialize the data. 

 

        # If data.__getinitargs__ exists, the object must be reconstructed by 

        # calling cls(**args), where args is a tuple returned by 

        # __getinitargs__. Otherwise, the cls.__init__ method should never be 

        # called and the class instance is created by instantiating a trivial 

        # class and assigning to the instance's __class__ variable. 

 

        # If data.__getstate__ exists, it returns the state of the object. 

        # Otherwise, the state of the object is data.__dict__. 

 

        # We produce either a !!python/object or !!python/object/new node. 

        # If data.__getinitargs__ does not exist and state is a dictionary, we 

        # produce a !!python/object node . Otherwise we produce a 

        # !!python/object/new node. 

 

        cls = data.__class__ 

        class_name = u'%s.%s' % (cls.__module__, cls.__name__) 

        args = None 

        state = None 

        if hasattr(data, '__getinitargs__'): 

            args = list(data.__getinitargs__()) 

        if hasattr(data, '__getstate__'): 

            state = data.__getstate__() 

        else: 

            state = data.__dict__ 

        if args is None and isinstance(state, dict): 

            return self.represent_mapping( 

                    u'tag:yaml.org,2002:python/object:'+class_name, state) 

        if isinstance(state, dict) and not state: 

            return self.represent_sequence( 

                    u'tag:yaml.org,2002:python/object/new:'+class_name, args) 

        value = {} 

        if args: 

            value['args'] = args 

        value['state'] = state 

        return self.represent_mapping( 

                u'tag:yaml.org,2002:python/object/new:'+class_name, value) 

 

    def represent_object(self, data): 

        # We use __reduce__ API to save the data. data.__reduce__ returns 

        # a tuple of length 2-5: 

        #   (function, args, state, listitems, dictitems) 

 

        # For reconstructing, we calls function(*args), then set its state, 

        # listitems, and dictitems if they are not None. 

 

        # A special case is when function.__name__ == '__newobj__'. In this 

        # case we create the object with args[0].__new__(*args). 

 

        # Another special case is when __reduce__ returns a string - we don't 

        # support it. 

 

        # We produce a !!python/object, !!python/object/new or 

        # !!python/object/apply node. 

 

        cls = type(data) 

        if cls in copy_reg.dispatch_table: 

            reduce = copy_reg.dispatch_table[cls](data) 

        elif hasattr(data, '__reduce_ex__'): 

            reduce = data.__reduce_ex__(2) 

        elif hasattr(data, '__reduce__'): 

            reduce = data.__reduce__() 

        else: 

            raise RepresenterError("cannot represent object: %r" % data) 

        reduce = (list(reduce)+[None]*5)[:5] 

        function, args, state, listitems, dictitems = reduce 

        args = list(args) 

        if state is None: 

            state = {} 

        if listitems is not None: 

            listitems = list(listitems) 

        if dictitems is not None: 

            dictitems = dict(dictitems) 

        if function.__name__ == '__newobj__': 

            function = args[0] 

            args = args[1:] 

            tag = u'tag:yaml.org,2002:python/object/new:' 

            newobj = True 

        else: 

            tag = u'tag:yaml.org,2002:python/object/apply:' 

            newobj = False 

        function_name = u'%s.%s' % (function.__module__, function.__name__) 

        if not args and not listitems and not dictitems \ 

                and isinstance(state, dict) and newobj: 

            return self.represent_mapping( 

                    u'tag:yaml.org,2002:python/object:'+function_name, state) 

        if not listitems and not dictitems  \ 

                and isinstance(state, dict) and not state: 

            return self.represent_sequence(tag+function_name, args) 

        value = {} 

        if args: 

            value['args'] = args 

        if state or not isinstance(state, dict): 

            value['state'] = state 

        if listitems: 

            value['listitems'] = listitems 

        if dictitems: 

            value['dictitems'] = dictitems 

        return self.represent_mapping(tag+function_name, value) 

 

Representer.add_representer(str, 

        Representer.represent_str) 

 

Representer.add_representer(unicode, 

        Representer.represent_unicode) 

 

Representer.add_representer(long, 

        Representer.represent_long) 

 

Representer.add_representer(complex, 

        Representer.represent_complex) 

 

Representer.add_representer(tuple, 

        Representer.represent_tuple) 

 

Representer.add_representer(type, 

        Representer.represent_name) 

 

Representer.add_representer(types.ClassType, 

        Representer.represent_name) 

 

Representer.add_representer(types.FunctionType, 

        Representer.represent_name) 

 

Representer.add_representer(types.BuiltinFunctionType, 

        Representer.represent_name) 

 

Representer.add_representer(types.ModuleType, 

        Representer.represent_module) 

 

Representer.add_multi_representer(types.InstanceType, 

        Representer.represent_instance) 

 

Representer.add_multi_representer(object, 

        Representer.represent_object)