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"""Adapters for IPython msg spec versions."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import json
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from IPython.core.release import kernel_protocol_version_info
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from IPython.utils.tokenutil import token_at_cursor
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def code_to_line(code, cursor_pos):
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"""Turn a multiline code block and cursor position into a single line
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and new cursor position.
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For adapting ``complete_`` and ``object_info_request``.
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"""
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for line in code.splitlines(True):
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n = len(line)
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if cursor_pos > n:
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cursor_pos -= n
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else:
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break
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return line, cursor_pos
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class Adapter(object):
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"""Base class for adapting messages
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Override message_type(msg) methods to create adapters.
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"""
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msg_type_map = {}
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def update_header(self, msg):
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return msg
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def update_metadata(self, msg):
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return msg
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def update_msg_type(self, msg):
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header = msg['header']
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msg_type = header['msg_type']
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if msg_type in self.msg_type_map:
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msg['msg_type'] = header['msg_type'] = self.msg_type_map[msg_type]
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return msg
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def handle_reply_status_error(self, msg):
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"""This will be called *instead of* the regular handler
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on any reply with status != ok
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"""
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return msg
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def __call__(self, msg):
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msg = self.update_header(msg)
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msg = self.update_metadata(msg)
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msg = self.update_msg_type(msg)
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header = msg['header']
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handler = getattr(self, header['msg_type'], None)
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if handler is None:
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return msg
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# handle status=error replies separately (no change, at present)
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if msg['content'].get('status', None) in {'error', 'aborted'}:
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return self.handle_reply_status_error(msg)
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return handler(msg)
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def _version_str_to_list(version):
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"""convert a version string to a list of ints
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non-int segments are excluded
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"""
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v = []
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for part in version.split('.'):
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try:
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v.append(int(part))
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except ValueError:
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pass
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return v
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class V5toV4(Adapter):
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"""Adapt msg protocol v5 to v4"""
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version = '4.1'
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msg_type_map = {
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'execute_result' : 'pyout',
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'execute_input' : 'pyin',
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'error' : 'pyerr',
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'inspect_request' : 'object_info_request',
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'inspect_reply' : 'object_info_reply',
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}
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def update_header(self, msg):
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msg['header'].pop('version', None)
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return msg
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# shell channel
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def kernel_info_reply(self, msg):
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content = msg['content']
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content.pop('banner', None)
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for key in ('language_version', 'protocol_version'):
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if key in content:
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content[key] = _version_str_to_list(content[key])
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if content.pop('implementation', '') == 'ipython' \
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and 'implementation_version' in content:
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content['ipython_version'] = content.pop('implmentation_version')
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content.pop('implementation_version', None)
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content.setdefault("implmentation", content['language'])
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return msg
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def execute_request(self, msg):
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content = msg['content']
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content.setdefault('user_variables', [])
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return msg
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def execute_reply(self, msg):
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content = msg['content']
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content.setdefault('user_variables', {})
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# TODO: handle payloads
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return msg
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def complete_request(self, msg):
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content = msg['content']
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code = content['code']
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cursor_pos = content['cursor_pos']
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line, cursor_pos = code_to_line(code, cursor_pos)
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new_content = msg['content'] = {}
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new_content['text'] = ''
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new_content['line'] = line
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new_content['block'] = None
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new_content['cursor_pos'] = cursor_pos
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return msg
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def complete_reply(self, msg):
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content = msg['content']
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cursor_start = content.pop('cursor_start')
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cursor_end = content.pop('cursor_end')
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match_len = cursor_end - cursor_start
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content['matched_text'] = content['matches'][0][:match_len]
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content.pop('metadata', None)
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return msg
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def object_info_request(self, msg):
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content = msg['content']
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code = content['code']
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cursor_pos = content['cursor_pos']
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line, _ = code_to_line(code, cursor_pos)
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new_content = msg['content'] = {}
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new_content['oname'] = token_at_cursor(code, cursor_pos)
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new_content['detail_level'] = content['detail_level']
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return msg
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def object_info_reply(self, msg):
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"""inspect_reply can't be easily backward compatible"""
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msg['content'] = {'found' : False, 'name' : 'unknown'}
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return msg
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# iopub channel
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def display_data(self, msg):
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content = msg['content']
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content.setdefault("source", "display")
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data = content['data']
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if 'application/json' in data:
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try:
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data['application/json'] = json.dumps(data['application/json'])
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except Exception:
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# warn?
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pass
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return msg
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# stdin channel
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def input_request(self, msg):
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msg['content'].pop('password', None)
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return msg
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class V4toV5(Adapter):
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"""Convert msg spec V4 to V5"""
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version = '5.0'
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# invert message renames above
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msg_type_map = {v:k for k,v in V5toV4.msg_type_map.items()}
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def update_header(self, msg):
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msg['header']['version'] = self.version
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return msg
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# shell channel
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def kernel_info_reply(self, msg):
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content = msg['content']
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for key in ('language_version', 'protocol_version', 'ipython_version'):
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if key in content:
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content[key] = ".".join(map(str, content[key]))
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if content['language'].startswith('python') and 'ipython_version' in content:
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content['implementation'] = 'ipython'
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content['implementation_version'] = content.pop('ipython_version')
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content['banner'] = ''
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return msg
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def execute_request(self, msg):
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content = msg['content']
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user_variables = content.pop('user_variables', [])
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user_expressions = content.setdefault('user_expressions', {})
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for v in user_variables:
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user_expressions[v] = v
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return msg
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def execute_reply(self, msg):
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content = msg['content']
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user_expressions = content.setdefault('user_expressions', {})
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user_variables = content.pop('user_variables', {})
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if user_variables:
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user_expressions.update(user_variables)
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# Pager payloads became a mime bundle
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for payload in content.get('payload', []):
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if payload.get('source', None) == 'page' and ('text' in payload):
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if 'data' not in payload:
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payload['data'] = {}
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payload['data']['text/plain'] = payload.pop('text')
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return msg
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def complete_request(self, msg):
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old_content = msg['content']
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new_content = msg['content'] = {}
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new_content['code'] = old_content['line']
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new_content['cursor_pos'] = old_content['cursor_pos']
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return msg
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def complete_reply(self, msg):
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# complete_reply needs more context than we have to get cursor_start and end.
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# use special value of `-1` to indicate to frontend that it should be at
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# the current cursor position.
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content = msg['content']
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new_content = msg['content'] = {'status' : 'ok'}
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new_content['matches'] = content['matches']
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new_content['cursor_start'] = -len(content['matched_text'])
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new_content['cursor_end'] = None
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new_content['metadata'] = {}
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return msg
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def inspect_request(self, msg):
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content = msg['content']
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name = content['oname']
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new_content = msg['content'] = {}
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new_content['code'] = name
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new_content['cursor_pos'] = len(name)
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new_content['detail_level'] = content['detail_level']
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return msg
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def inspect_reply(self, msg):
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"""inspect_reply can't be easily backward compatible"""
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content = msg['content']
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new_content = msg['content'] = {'status' : 'ok'}
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found = new_content['found'] = content['found']
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new_content['name'] = content['name']
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new_content['data'] = data = {}
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new_content['metadata'] = {}
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if found:
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lines = []
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for key in ('call_def', 'init_definition', 'definition'):
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if content.get(key, False):
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lines.append(content[key])
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break
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for key in ('call_docstring', 'init_docstring', 'docstring'):
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if content.get(key, False):
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lines.append(content[key])
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break
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if not lines:
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lines.append("<empty docstring>")
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data['text/plain'] = '\n'.join(lines)
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return msg
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# iopub channel
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def display_data(self, msg):
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content = msg['content']
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content.pop("source", None)
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data = content['data']
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if 'application/json' in data:
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try:
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data['application/json'] = json.loads(data['application/json'])
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except Exception:
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# warn?
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pass
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return msg
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# stdin channel
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def input_request(self, msg):
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msg['content'].setdefault('password', False)
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return msg
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def adapt(msg, to_version=kernel_protocol_version_info[0]):
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"""Adapt a single message to a target version
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Parameters
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----------
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msg : dict
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An IPython message.
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to_version : int, optional
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The target major version.
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If unspecified, adapt to the current version for IPython.
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Returns
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-------
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msg : dict
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An IPython message appropriate in the new version.
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"""
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header = msg['header']
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if 'version' in header:
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from_version = int(header['version'].split('.')[0])
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else:
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# assume last version before adding the key to the header
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from_version = 4
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adapter = adapters.get((from_version, to_version), None)
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if adapter is None:
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return msg
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return adapter(msg)
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# one adapter per major version from,to
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adapters = {
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(5,4) : V5toV4(),
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(4,5) : V4toV5(),
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}
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