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cocoa_frontend.py
560 lines | 18.1 KiB | text/x-python | PythonLexer
# encoding: utf-8
# -*- test-case-name: IPython.frontend.cocoa.tests.test_cocoa_frontend -*-
"""PyObjC classes to provide a Cocoa frontend to the
IPython.kernel.engineservice.IEngineBase.
To add an IPython interpreter to a cocoa app, instantiate an
IPythonCocoaController in a XIB and connect its textView outlet to an
NSTextView instance in your UI. That's it.
Author: Barry Wark
"""
__docformat__ = "restructuredtext en"
#-----------------------------------------------------------------------------
# Copyright (C) 2008 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import sys
import objc
from IPython.external import guid
from Foundation import NSObject, NSMutableArray, NSMutableDictionary,\
NSLog, NSNotificationCenter, NSMakeRange,\
NSLocalizedString, NSIntersectionRange,\
NSString, NSAutoreleasePool
from AppKit import NSApplicationWillTerminateNotification, NSBeep,\
NSTextView, NSRulerView, NSVerticalRuler
from pprint import saferepr
import IPython
from IPython.kernel.engineservice import ThreadedEngineService
from IPython.frontend.asyncfrontendbase import AsyncFrontEndBase
from twisted.internet.threads import blockingCallFromThread
from twisted.python.failure import Failure
#-----------------------------------------------------------------------------
# Classes to implement the Cocoa frontend
#-----------------------------------------------------------------------------
# TODO:
# 1. use MultiEngineClient and out-of-process engine rather than
# ThreadedEngineService?
# 2. integrate Xgrid launching of engines
class AutoreleasePoolWrappedThreadedEngineService(ThreadedEngineService):
"""Wrap all blocks in an NSAutoreleasePool"""
def wrapped_execute(self, msg, lines):
"""wrapped_execute"""
try:
p = NSAutoreleasePool.alloc().init()
result = super(AutoreleasePoolWrappedThreadedEngineService,
self).wrapped_execute(msg, lines)
finally:
p.drain()
return result
class Cell(NSObject):
"""
Representation of the prompts, input and output of a cell in the
frontend
"""
blockNumber = objc.ivar().unsigned_long()
blockID = objc.ivar()
inputBlock = objc.ivar()
output = objc.ivar()
class CellBlock(object):
"""
Storage for information about text ranges relating to a single cell
"""
def __init__(self, inputPromptRange, inputRange=None, outputPromptRange=None,
outputRange=None):
super(CellBlock, self).__init__()
self.inputPromptRange = inputPromptRange
self.inputRange = inputRange
self.outputPromptRange = outputPromptRange
self.outputRange = outputRange
def update_ranges_for_insertion(self, text, textRange):
"""Update ranges for text insertion at textRange"""
for r in [self.inputPromptRange,self.inputRange,
self.outputPromptRange, self.outputRange]:
if(r == None):
continue
intersection = NSIntersectionRange(r,textRange)
if(intersection.length == 0): #ranges don't intersect
if r.location >= textRange.location:
r.location += len(text)
else: #ranges intersect
if(r.location > textRange.location):
offset = len(text) - intersection.length
r.length -= offset
r.location += offset
elif(r.location == textRange.location):
r.length += len(text) - intersection.length
else:
r.length -= intersection.length
def update_ranges_for_deletion(self, textRange):
"""Update ranges for text deletion at textRange"""
for r in [self.inputPromptRange,self.inputRange,
self.outputPromptRange, self.outputRange]:
if(r==None):
continue
intersection = NSIntersectionRange(r, textRange)
if(intersection.length == 0): #ranges don't intersect
if r.location >= textRange.location:
r.location -= textRange.length
else: #ranges intersect
if(r.location > textRange.location):
offset = intersection.length
r.length -= offset
r.location += offset
elif(r.location == textRange.location):
r.length += intersection.length
else:
r.length -= intersection.length
def __repr__(self):
return 'CellBlock('+ str((self.inputPromptRange,
self.inputRange,
self.outputPromptRange,
self.outputRange)) + ')'
class IPythonCocoaController(NSObject, AsyncFrontEndBase):
userNS = objc.ivar() #mirror of engine.user_ns (key=>str(value))
waitingForEngine = objc.ivar().bool()
textView = objc.IBOutlet()
def init(self):
self = super(IPythonCocoaController, self).init()
AsyncFrontEndBase.__init__(self,
engine=AutoreleasePoolWrappedThreadedEngineService())
if(self != None):
self._common_init()
return self
def _common_init(self):
"""_common_init"""
self.userNS = NSMutableDictionary.dictionary()
self.waitingForEngine = False
self.lines = {}
self.tabSpaces = 4
self.tabUsesSpaces = True
self.currentBlockID = self.next_block_ID()
self.blockRanges = {} # blockID=>CellBlock
def awakeFromNib(self):
"""awakeFromNib"""
self._common_init()
# Start the IPython engine
self.engine.startService()
NSLog('IPython engine started')
# Register for app termination
nc = NSNotificationCenter.defaultCenter()
nc.addObserver_selector_name_object_(
self,
'appWillTerminate:',
NSApplicationWillTerminateNotification,
None)
self.textView.setDelegate_(self)
self.textView.enclosingScrollView().setHasVerticalRuler_(True)
r = NSRulerView.alloc().initWithScrollView_orientation_(
self.textView.enclosingScrollView(),
NSVerticalRuler)
self.verticalRulerView = r
self.verticalRulerView.setClientView_(self.textView)
self._start_cli_banner()
self.start_new_block()
def appWillTerminate_(self, notification):
"""appWillTerminate"""
self.engine.stopService()
def complete(self, token):
"""Complete token in engine's user_ns
Parameters
----------
token : string
Result
------
Deferred result of
IPython.kernel.engineservice.IEngineBase.complete
"""
return self.engine.complete(token)
def execute(self, block, blockID=None):
self.waitingForEngine = True
self.willChangeValueForKey_('commandHistory')
d = super(IPythonCocoaController, self).execute(block,
blockID)
d.addBoth(self._engine_done)
d.addCallback(self._update_user_ns)
return d
def push_(self, namespace):
"""Push dictionary of key=>values to python namespace"""
self.waitingForEngine = True
self.willChangeValueForKey_('commandHistory')
d = self.engine.push(namespace)
d.addBoth(self._engine_done)
d.addCallback(self._update_user_ns)
def pull_(self, keys):
"""Pull keys from python namespace"""
self.waitingForEngine = True
result = blockingCallFromThread(self.engine.pull, keys)
self.waitingForEngine = False
@objc.signature('v@:@I')
def executeFileAtPath_encoding_(self, path, encoding):
"""Execute file at path in an empty namespace. Update the engine
user_ns with the resulting locals."""
lines,err = NSString.stringWithContentsOfFile_encoding_error_(
path,
encoding,
None)
self.engine.execute(lines)
def _engine_done(self, x):
self.waitingForEngine = False
self.didChangeValueForKey_('commandHistory')
return x
def _update_user_ns(self, result):
"""Update self.userNS from self.engine's namespace"""
d = self.engine.keys()
d.addCallback(self._get_engine_namespace_values_for_keys)
return result
def _get_engine_namespace_values_for_keys(self, keys):
d = self.engine.pull(keys)
d.addCallback(self._store_engine_namespace_values, keys=keys)
def _store_engine_namespace_values(self, values, keys=[]):
assert(len(values) == len(keys))
self.willChangeValueForKey_('userNS')
for (k,v) in zip(keys,values):
self.userNS[k] = saferepr(v)
self.didChangeValueForKey_('userNS')
def update_cell_prompt(self, result, blockID=None):
print self.blockRanges
if(isinstance(result, Failure)):
prompt = self.input_prompt()
else:
prompt = self.input_prompt(number=result['number'])
r = self.blockRanges[blockID].inputPromptRange
self.insert_text(prompt,
textRange=r,
scrollToVisible=False
)
return result
def render_result(self, result):
blockID = result['blockID']
inputRange = self.blockRanges[blockID].inputRange
del self.blockRanges[blockID]
#print inputRange,self.current_block_range()
self.insert_text('\n' +
self.output_prompt(number=result['number']) +
result.get('display',{}).get('pprint','') +
'\n\n',
textRange=NSMakeRange(inputRange.location+inputRange.length,
0))
return result
def render_error(self, failure):
print failure
blockID = failure.blockID
inputRange = self.blockRanges[blockID].inputRange
self.insert_text('\n' +
self.output_prompt() +
'\n' +
failure.getErrorMessage() +
'\n\n',
textRange=NSMakeRange(inputRange.location +
inputRange.length,
0))
self.start_new_block()
return failure
def _start_cli_banner(self):
"""Print banner"""
banner = """IPython1 %s -- An enhanced Interactive Python.""" % \
IPython.__version__
self.insert_text(banner + '\n\n')
def start_new_block(self):
""""""
self.currentBlockID = self.next_block_ID()
self.blockRanges[self.currentBlockID] = self.new_cell_block()
self.insert_text(self.input_prompt(),
textRange=self.current_block_range().inputPromptRange)
def next_block_ID(self):
return guid.generate()
def new_cell_block(self):
"""A new CellBlock at the end of self.textView.textStorage()"""
return CellBlock(NSMakeRange(self.textView.textStorage().length(),
0), #len(self.input_prompt())),
NSMakeRange(self.textView.textStorage().length(),# + len(self.input_prompt()),
0))
def current_block_range(self):
return self.blockRanges.get(self.currentBlockID,
self.new_cell_block())
def current_block(self):
"""The current block's text"""
return self.text_for_range(self.current_block_range().inputRange)
def text_for_range(self, textRange):
"""text_for_range"""
ts = self.textView.textStorage()
return ts.string().substringWithRange_(textRange)
def current_line(self):
block = self.text_for_range(self.current_block_range().inputRange)
block = block.split('\n')
return block[-1]
def insert_text(self, string=None, textRange=None, scrollToVisible=True):
"""Insert text into textView at textRange, updating blockRanges
as necessary
"""
if(textRange == None):
#range for end of text
textRange = NSMakeRange(self.textView.textStorage().length(), 0)
self.textView.replaceCharactersInRange_withString_(
textRange, string)
for r in self.blockRanges.itervalues():
r.update_ranges_for_insertion(string, textRange)
self.textView.setSelectedRange_(textRange)
if(scrollToVisible):
self.textView.scrollRangeToVisible_(textRange)
def replace_current_block_with_string(self, textView, string):
textView.replaceCharactersInRange_withString_(
self.current_block_range().inputRange,
string)
self.current_block_range().inputRange.length = len(string)
r = NSMakeRange(textView.textStorage().length(), 0)
textView.scrollRangeToVisible_(r)
textView.setSelectedRange_(r)
def current_indent_string(self):
"""returns string for indent or None if no indent"""
return self._indent_for_block(self.current_block())
def _indent_for_block(self, block):
lines = block.split('\n')
if(len(lines) > 1):
currentIndent = len(lines[-1]) - len(lines[-1].lstrip())
if(currentIndent == 0):
currentIndent = self.tabSpaces
if(self.tabUsesSpaces):
result = ' ' * currentIndent
else:
result = '\t' * (currentIndent/self.tabSpaces)
else:
result = None
return result
# NSTextView delegate methods...
def textView_doCommandBySelector_(self, textView, selector):
assert(textView == self.textView)
NSLog("textView_doCommandBySelector_: "+selector)
if(selector == 'insertNewline:'):
indent = self.current_indent_string()
if(indent):
line = indent + self.current_line()
else:
line = self.current_line()
if(self.is_complete(self.current_block())):
self.execute(self.current_block(),
blockID=self.currentBlockID)
self.start_new_block()
return True
return False
elif(selector == 'moveUp:'):
prevBlock = self.get_history_previous(self.current_block())
if(prevBlock != None):
self.replace_current_block_with_string(textView, prevBlock)
else:
NSBeep()
return True
elif(selector == 'moveDown:'):
nextBlock = self.get_history_next()
if(nextBlock != None):
self.replace_current_block_with_string(textView, nextBlock)
else:
NSBeep()
return True
elif(selector == 'moveToBeginningOfParagraph:'):
textView.setSelectedRange_(NSMakeRange(
self.current_block_range().inputRange.location,
0))
return True
elif(selector == 'moveToEndOfParagraph:'):
textView.setSelectedRange_(NSMakeRange(
self.current_block_range().inputRange.location + \
self.current_block_range().inputRange.length, 0))
return True
elif(selector == 'deleteToEndOfParagraph:'):
if(textView.selectedRange().location <= \
self.current_block_range().location):
raise NotImplemented()
return False # don't actually handle the delete
elif(selector == 'insertTab:'):
if(len(self.current_line().strip()) == 0): #only white space
return False
else:
self.textView.complete_(self)
return True
elif(selector == 'deleteBackward:'):
#if we're at the beginning of the current block, ignore
if(textView.selectedRange().location == \
self.current_block_range().inputRange.location):
return True
else:
for r in self.blockRanges.itervalues():
deleteRange = textView.selectedRange
if(deleteRange.length == 0):
deleteRange.location -= 1
deleteRange.length = 1
r.update_ranges_for_deletion(deleteRange)
return False
return False
def textView_shouldChangeTextInRanges_replacementStrings_(self,
textView, ranges, replacementStrings):
"""
Delegate method for NSTextView.
Refuse change text in ranges not at end, but make those changes at
end.
"""
assert(len(ranges) == len(replacementStrings))
allow = True
for r,s in zip(ranges, replacementStrings):
r = r.rangeValue()
if(textView.textStorage().length() > 0 and
r.location < self.current_block_range().inputRange.location):
self.insert_text(s)
allow = False
return allow
def textView_completions_forPartialWordRange_indexOfSelectedItem_(self,
textView, words, charRange, index):
try:
ts = textView.textStorage()
token = ts.string().substringWithRange_(charRange)
completions = blockingCallFromThread(self.complete, token)
except:
completions = objc.nil
NSBeep()
return (completions,0)