author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 12 Sep 2009 17:10:39 +0200 | |
changeset 2907 | fbf0d63f37b9 |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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"""PyYAML event listener |
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Contains class which interprets YAML events and forwards them to |
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a handler object. |
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""" |
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from google.appengine.api import yaml_errors |
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import yaml |
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_EVENT_METHOD_MAP = { |
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yaml.events.StreamStartEvent: 'StreamStart', |
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yaml.events.StreamEndEvent: 'StreamEnd', |
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yaml.events.DocumentStartEvent: 'DocumentStart', |
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yaml.events.DocumentEndEvent: 'DocumentEnd', |
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yaml.events.AliasEvent: 'Alias', |
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yaml.events.ScalarEvent: 'Scalar', |
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yaml.events.SequenceStartEvent: 'SequenceStart', |
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yaml.events.SequenceEndEvent: 'SequenceEnd', |
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yaml.events.MappingStartEvent: 'MappingStart', |
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yaml.events.MappingEndEvent: 'MappingEnd', |
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} |
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class EventHandler(object): |
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"""Handler interface for parsing YAML files. |
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Implement this interface to define specific YAML event handling class. |
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Implementing classes instances are passed to the constructor of |
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EventListener to act as a receiver of YAML parse events. |
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""" |
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def StreamStart(self, event, loader): |
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"""Handle start of stream event""" |
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def StreamEnd(self, event, loader): |
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"""Handle end of stream event""" |
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def DocumentStart(self, event, loader): |
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"""Handle start of document event""" |
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def DocumentEnd(self, event, loader): |
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"""Handle end of document event""" |
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def Alias(self, event, loader): |
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"""Handle alias event""" |
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def Scalar(self, event, loader): |
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"""Handle scalar event""" |
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def SequenceStart(self, event, loader): |
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"""Handle start of sequence event""" |
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def SequenceEnd(self, event, loader): |
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"""Handle end of sequence event""" |
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def MappingStart(self, event, loader): |
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"""Handle start of mappping event""" |
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def MappingEnd(self, event, loader): |
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"""Handle end of mapping event""" |
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class EventListener(object): |
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"""Helper class to re-map PyYAML events to method calls. |
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By default, PyYAML generates its events via a Python generator. This class |
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is a helper that iterates over the events from the PyYAML parser and forwards |
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them to a handle class in the form of method calls. For simplicity, the |
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underlying event is forwarded to the handler as a parameter to the call. |
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This object does not itself produce iterable objects, but is really a mapping |
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to a given handler instance. |
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Example use: |
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class PrintDocumentHandler(object): |
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def DocumentStart(event): |
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print "A new document has been started" |
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EventListener(PrintDocumentHandler()).Parse(''' |
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key1: value1 |
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--- |
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key2: value2 |
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''' |
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>>> A new document has been started |
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A new document has been started |
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In the example above, the implemented handler class (PrintDocumentHandler) |
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has a single method which reports each time a new document is started within |
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a YAML file. It is not necessary to subclass the EventListener, merely it |
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receives a PrintDocumentHandler instance. Every time a new document begins, |
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PrintDocumentHandler.DocumentStart is called with the PyYAML event passed |
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in as its parameter.. |
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""" |
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115 |
def __init__(self, event_handler): |
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"""Initialize PyYAML event listener. |
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117 |
|
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118 |
Constructs internal mapping directly from event type to method on actual |
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119 |
handler. This prevents reflection being used during actual parse time. |
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120 |
|
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121 |
Args: |
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event_handler: Event handler that will receive mapped events. Must |
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123 |
implement at least one appropriate handler method named from |
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124 |
the values of the _EVENT_METHOD_MAP. |
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125 |
|
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126 |
Raises: |
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ListenerConfigurationError if event_handler is not an EventHandler. |
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""" |
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129 |
if not isinstance(event_handler, EventHandler): |
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raise yaml_errors.ListenerConfigurationError( |
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'Must provide event handler of type yaml_listener.EventHandler') |
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132 |
self._event_method_map = {} |
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133 |
for event, method in _EVENT_METHOD_MAP.iteritems(): |
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self._event_method_map[event] = getattr(event_handler, method) |
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135 |
|
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136 |
def HandleEvent(self, event, loader=None): |
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"""Handle individual PyYAML event. |
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138 |
|
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139 |
Args: |
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event: Event to forward to method call in method call. |
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141 |
|
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142 |
Raises: |
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IllegalEvent when receives an unrecognized or unsupported event type. |
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144 |
""" |
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145 |
if event.__class__ not in _EVENT_METHOD_MAP: |
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raise yaml_errors.IllegalEvent( |
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"%s is not a valid PyYAML class" % event.__class__.__name__) |
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148 |
if event.__class__ in self._event_method_map: |
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149 |
self._event_method_map[event.__class__](event, loader) |
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150 |
|
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151 |
def _HandleEvents(self, events): |
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152 |
"""Iterate over all events and send them to handler. |
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153 |
|
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154 |
This method is not meant to be called from the interface. |
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155 |
|
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156 |
Only use in tests. |
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157 |
|
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158 |
Args: |
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159 |
events: Iterator or generator containing events to process. |
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160 |
raises: |
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161 |
EventListenerParserError when a yaml.parser.ParserError is raised. |
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162 |
EventError when an exception occurs during the handling of an event. |
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163 |
""" |
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164 |
for event in events: |
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165 |
try: |
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166 |
self.HandleEvent(*event) |
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167 |
except Exception, e: |
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168 |
event_object, loader = event |
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169 |
raise yaml_errors.EventError(e, event_object) |
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170 |
|
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171 |
def _GenerateEventParameters(self, |
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172 |
stream, |
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173 |
loader_class=yaml.loader.SafeLoader): |
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174 |
"""Creates a generator that yields event, loader parameter pairs. |
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175 |
|
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176 |
For use as parameters to HandleEvent method for use by Parse method. |
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177 |
During testing, _GenerateEventParameters is simulated by allowing |
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178 |
the harness to pass in a list of pairs as the parameter. |
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179 |
|
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180 |
A list of (event, loader) pairs must be passed to _HandleEvents otherwise |
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181 |
it is not possible to pass the loader instance to the handler. |
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182 |
|
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183 |
Also responsible for instantiating the loader from the Loader |
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184 |
parameter. |
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185 |
|
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186 |
Args: |
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187 |
stream: String document or open file object to process as per the |
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188 |
yaml.parse method. Any object that implements a 'read()' method which |
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189 |
returns a string document will work. |
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190 |
Loader: Loader class to use as per the yaml.parse method. Used to |
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191 |
instantiate new yaml.loader instance. |
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192 |
|
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193 |
Yields: |
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194 |
Tuple(event, loader) where: |
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195 |
event: Event emitted by PyYAML loader. |
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196 |
loader_class: Used for dependency injection. |
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197 |
""" |
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198 |
assert loader_class is not None |
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199 |
try: |
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200 |
loader = loader_class(stream) |
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201 |
while loader.check_event(): |
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202 |
yield (loader.get_event(), loader) |
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203 |
except yaml.error.YAMLError, e: |
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204 |
raise yaml_errors.EventListenerYAMLError(e) |
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205 |
|
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206 |
def Parse(self, stream, loader_class=yaml.loader.SafeLoader): |
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207 |
"""Call YAML parser to generate and handle all events. |
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208 |
|
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209 |
Calls PyYAML parser and sends resulting generator to handle_event method |
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210 |
for processing. |
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211 |
|
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212 |
Args: |
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213 |
stream: String document or open file object to process as per the |
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214 |
yaml.parse method. Any object that implements a 'read()' method which |
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215 |
returns a string document will work with the YAML parser. |
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216 |
loader_class: Used for dependency injection. |
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217 |
""" |
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218 |
self._HandleEvents(self._GenerateEventParameters(stream, loader_class)) |