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# encoding: utf-8
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# -*- test-case-name: IPython.frontend.cocoa.tests.test_cocoa_frontend -*-
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"""PyObjC classes to provide a Cocoa frontend to the
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IPython.kernel.engineservice.IEngineBase.
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To add an IPython interpreter to a cocoa app, instantiate an
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IPythonCocoaController in a XIB and connect its textView outlet to an
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NSTextView instance in your UI. That's it.
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Author: Barry Wark
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"""
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__docformat__ = "restructuredtext en"
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import objc
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import uuid
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from Foundation import NSObject, NSMutableArray, NSMutableDictionary,\
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NSLog, NSNotificationCenter, NSMakeRange,\
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NSLocalizedString, NSIntersectionRange
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from AppKit import NSApplicationWillTerminateNotification, NSBeep,\
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NSTextView, NSRulerView, NSVerticalRuler
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from pprint import saferepr
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import IPython
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from IPython.kernel.engineservice import ThreadedEngineService
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from IPython.frontend.frontendbase import FrontEndBase
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from twisted.internet.threads import blockingCallFromThread
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from twisted.python.failure import Failure
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#------------------------------------------------------------------------------
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# Classes to implement the Cocoa frontend
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#------------------------------------------------------------------------------
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# TODO:
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# 1. use MultiEngineClient and out-of-process engine rather than
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# ThreadedEngineService?
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# 2. integrate Xgrid launching of engines
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class IPythonCocoaController(NSObject, FrontEndBase):
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userNS = objc.ivar() #mirror of engine.user_ns (key=>str(value))
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waitingForEngine = objc.ivar().bool()
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textView = objc.IBOutlet()
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def init(self):
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self = super(IPythonCocoaController, self).init()
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FrontEndBase.__init__(self, engine=ThreadedEngineService())
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if(self != None):
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self._common_init()
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return self
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def _common_init(self):
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"""_common_init"""
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self.userNS = NSMutableDictionary.dictionary()
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self.waitingForEngine = False
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self.lines = {}
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self.tabSpaces = 4
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self.tabUsesSpaces = True
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self.currentBlockID = self.next_block_ID()
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self.blockRanges = {} # blockID=>NSRange
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def awakeFromNib(self):
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"""awakeFromNib"""
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self._common_init()
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# Start the IPython engine
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self.engine.startService()
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NSLog('IPython engine started')
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# Register for app termination
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nc = NSNotificationCenter.defaultCenter()
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nc.addObserver_selector_name_object_(
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self,
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'appWillTerminate:',
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NSApplicationWillTerminateNotification,
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None)
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self.textView.setDelegate_(self)
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self.textView.enclosingScrollView().setHasVerticalRuler_(True)
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r = NSRulerView.alloc().initWithScrollView_orientation_(
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self.textView.enclosingScrollView(),
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NSVerticalRuler)
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self.verticalRulerView = r
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self.verticalRulerView.setClientView_(self.textView)
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self._start_cli_banner()
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def appWillTerminate_(self, notification):
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"""appWillTerminate"""
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self.engine.stopService()
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def complete(self, token):
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"""Complete token in engine's user_ns
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Parameters
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----------
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token : string
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Result
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------
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Deferred result of
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IPython.kernel.engineservice.IEngineBase.complete
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"""
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return self.engine.complete(token)
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def execute(self, block, blockID=None):
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self.waitingForEngine = True
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self.willChangeValueForKey_('commandHistory')
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d = super(IPythonCocoaController, self).execute(block, blockID)
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d.addBoth(self._engine_done)
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d.addCallback(self._update_user_ns)
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return d
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def _engine_done(self, x):
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self.waitingForEngine = False
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self.didChangeValueForKey_('commandHistory')
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return x
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def _update_user_ns(self, result):
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"""Update self.userNS from self.engine's namespace"""
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d = self.engine.keys()
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d.addCallback(self._get_engine_namespace_values_for_keys)
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return result
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def _get_engine_namespace_values_for_keys(self, keys):
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d = self.engine.pull(keys)
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d.addCallback(self._store_engine_namespace_values, keys=keys)
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def _store_engine_namespace_values(self, values, keys=[]):
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assert(len(values) == len(keys))
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self.willChangeValueForKey_('userNS')
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for (k,v) in zip(keys,values):
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self.userNS[k] = saferepr(v)
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self.didChangeValueForKey_('userNS')
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def update_cell_prompt(self, result):
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if(isinstance(result, Failure)):
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blockID = result.blockID
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else:
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blockID = result['blockID']
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self.insert_text(self.input_prompt(result=result),
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textRange=NSMakeRange(self.blockRanges[blockID].location,0),
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scrollToVisible=False
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)
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return result
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def render_result(self, result):
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blockID = result['blockID']
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inputRange = self.blockRanges[blockID]
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del self.blockRanges[blockID]
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#print inputRange,self.current_block_range()
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self.insert_text('\n' +
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self.output_prompt(result) +
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result.get('display',{}).get('pprint','') +
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'\n\n',
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textRange=NSMakeRange(inputRange.location+inputRange.length,
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0))
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return result
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def render_error(self, failure):
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self.insert_text('\n\n'+str(failure)+'\n\n')
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self.start_new_block()
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return failure
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def _start_cli_banner(self):
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"""Print banner"""
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banner = """IPython1 %s -- An enhanced Interactive Python.""" % \
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IPython.__version__
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self.insert_text(banner + '\n\n')
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def start_new_block(self):
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""""""
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self.currentBlockID = self.next_block_ID()
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def next_block_ID(self):
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return uuid.uuid4()
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def current_block_range(self):
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return self.blockRanges.get(self.currentBlockID,
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NSMakeRange(self.textView.textStorage().length(),
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0))
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def current_block(self):
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"""The current block's text"""
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return self.text_for_range(self.current_block_range())
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def text_for_range(self, textRange):
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"""text_for_range"""
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ts = self.textView.textStorage()
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return ts.string().substringWithRange_(textRange)
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def current_line(self):
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block = self.text_for_range(self.current_block_range())
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block = block.split('\n')
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return block[-1]
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def insert_text(self, string=None, textRange=None, scrollToVisible=True):
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"""Insert text into textView at textRange, updating blockRanges
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as necessary
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"""
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if(textRange == None):
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#range for end of text
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textRange = NSMakeRange(self.textView.textStorage().length(), 0)
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for r in self.blockRanges.itervalues():
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intersection = NSIntersectionRange(r,textRange)
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if(intersection.length == 0): #ranges don't intersect
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if r.location >= textRange.location:
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r.location += len(string)
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else: #ranges intersect
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if(r.location <= textRange.location):
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assert(intersection.length == textRange.length)
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r.length += textRange.length
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else:
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r.location += intersection.length
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self.textView.replaceCharactersInRange_withString_(
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textRange, string)
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self.textView.setSelectedRange_(
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NSMakeRange(textRange.location+len(string), 0))
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if(scrollToVisible):
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self.textView.scrollRangeToVisible_(textRange)
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def replace_current_block_with_string(self, textView, string):
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textView.replaceCharactersInRange_withString_(
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self.current_block_range(),
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string)
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self.current_block_range().length = len(string)
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r = NSMakeRange(textView.textStorage().length(), 0)
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textView.scrollRangeToVisible_(r)
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textView.setSelectedRange_(r)
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def current_indent_string(self):
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"""returns string for indent or None if no indent"""
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return self._indent_for_block(self.currentBlock())
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def _indent_for_block(self, block):
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lines = block.split('\n')
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if(len(lines) > 1):
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currentIndent = len(lines[-1]) - len(lines[-1].lstrip())
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if(currentIndent == 0):
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currentIndent = self.tabSpaces
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if(self.tabUsesSpaces):
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result = ' ' * currentIndent
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else:
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result = '\t' * (currentIndent/self.tabSpaces)
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else:
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result = None
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return result
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# NSTextView delegate methods...
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def textView_doCommandBySelector_(self, textView, selector):
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assert(textView == self.textView)
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NSLog("textView_doCommandBySelector_: "+selector)
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if(selector == 'insertNewline:'):
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indent = self.current_indent_string()
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if(indent):
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line = indent + self.current_line()
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else:
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line = self.current_line()
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if(self.is_complete(self.current_block())):
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self.execute(self.current_block(),
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blockID=self.currentBlockID)
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self.start_new_block()
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return True
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return False
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elif(selector == 'moveUp:'):
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prevBlock = self.get_history_previous(self.current_block())
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if(prevBlock != None):
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self.replace_current_block_with_string(textView, prevBlock)
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else:
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NSBeep()
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return True
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elif(selector == 'moveDown:'):
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nextBlock = self.get_history_next()
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if(nextBlock != None):
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self.replace_current_block_with_string(textView, nextBlock)
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else:
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NSBeep()
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return True
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elif(selector == 'moveToBeginningOfParagraph:'):
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textView.setSelectedRange_(NSMakeRange(
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self.current_block_range().location,
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0))
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return True
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elif(selector == 'moveToEndOfParagraph:'):
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textView.setSelectedRange_(NSMakeRange(
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self.current_block_range().location + \
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self.current_block_range().length, 0))
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return True
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elif(selector == 'deleteToEndOfParagraph:'):
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if(textView.selectedRange().location <= \
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self.current_block_range().location):
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# Intersect the selected range with the current line range
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if(self.current_block_range().length < 0):
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self.blockRanges[self.currentBlockID].length = 0
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r = NSIntersectionRange(textView.rangesForUserTextChange()[0],
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self.current_block_range())
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if(r.length > 0): #no intersection
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textView.setSelectedRange_(r)
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return False # don't actually handle the delete
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elif(selector == 'insertTab:'):
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if(len(self.current_line().strip()) == 0): #only white space
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return False
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else:
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self.textView.complete_(self)
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return True
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elif(selector == 'deleteBackward:'):
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#if we're at the beginning of the current block, ignore
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if(textView.selectedRange().location == \
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self.current_block_range().location):
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return True
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else:
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self.current_block_range().length-=1
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return False
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return False
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def textView_shouldChangeTextInRanges_replacementStrings_(self,
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textView, ranges, replacementStrings):
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"""
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Delegate method for NSTextView.
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Refuse change text in ranges not at end, but make those changes at
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end.
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"""
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assert(len(ranges) == len(replacementStrings))
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allow = True
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for r,s in zip(ranges, replacementStrings):
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r = r.rangeValue()
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if(textView.textStorage().length() > 0 and
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r.location < self.current_block_range().location):
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self.insert_text(s)
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allow = False
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self.blockRanges.setdefault(self.currentBlockID,
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self.current_block_range()).length +=\
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len(s)
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return allow
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def textView_completions_forPartialWordRange_indexOfSelectedItem_(self,
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textView, words, charRange, index):
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try:
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ts = textView.textStorage()
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token = ts.string().substringWithRange_(charRange)
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completions = blockingCallFromThread(self.complete, token)
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except:
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completions = objc.nil
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NSBeep()
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return (completions,0)
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