Make chisel compatible with Python 3 (#266)

* Make chisel compatible with Python 3

Xcode 11 shipped with Python 3 now. Unfortunately, chisel was written in
Python 2 style and will fail load for lldb. This PR fixed the Python 3
compatibility issues.

* Addressed comment. Updated with file output.

* Properly resolve the conflict.

* Import from future on print.

* Address @lsavino comment.

Author: liuliu

commands/FBAccessibilityCommands.py

@@ -126,15 +126,15 @@ def printAccessibilityHierarchy(view, indent = 0):
 
   #if we don't have any accessibility string - we should have some children
   if int(a11yLabel.GetValue(), 16) == 0:
-    print indentString + ('{} {}'.format(classDesc, view))
+    print(indentString + ('{} {}'.format(classDesc, view)))
     #We call private method that gives back all visible accessibility children for view
     a11yElements = accessibilityElements(view)
     accessibilityElementsCount = int(fb.evaluateExpression('(int)[%s count]' % a11yElements))
     for index in range(0, accessibilityElementsCount):
       subview = fb.evaluateObjectExpression('[%s objectAtIndex:%i]' % (a11yElements, index))
       printAccessibilityHierarchy(subview, indent + 1)
   else:
-    print indentString + ('({} {}) {}'.format(classDesc, view, a11yLabel.GetObjectDescription()))
+    print(indentString + ('({} {}) {}'.format(classDesc, view, a11yLabel.GetObjectDescription())))
 
 def printAccessibilityIdentifiersHierarchy(view, indent = 0):
   a11yIdentifier = accessibilityIdentifier(view)
@@ -143,12 +143,12 @@ def printAccessibilityIdentifiersHierarchy(view, indent = 0):
 
   #if we don't have any accessibility identifier - we should have some children
   if int(a11yIdentifier.GetValue(), 16) == 0:
-    print indentString + ('{} {}'.format(classDesc, view))
+    print(indentString + ('{} {}'.format(classDesc, view)))
     #We call private method that gives back all visible accessibility children for view
     a11yElements = accessibilityElements(view)
     accessibilityElementsCount = int(fb.evaluateExpression('(int)[%s count]' % a11yElements))
     for index in range(0, accessibilityElementsCount):
       subview = fb.evaluateObjectExpression('[%s objectAtIndex:%i]' % (a11yElements, index))
       printAccessibilityIdentifiersHierarchy(subview, indent + 1)
   else:
-    print indentString + ('({} {}) {}'.format(classDesc, view, a11yIdentifier.GetObjectDescription()))
+    print(indentString + ('({} {}) {}'.format(classDesc, view, a11yIdentifier.GetObjectDescription())))

commands/FBAutoLayoutCommands.py

@@ -31,7 +31,7 @@ def run(self, arguments, options):
     view = fb.evaluateInputExpression(arguments[0])
     opt = fb.evaluateBooleanExpression('[UIView instancesRespondToSelector:@selector(_autolayoutTraceRecursively:)]')
     traceCall = '_autolayoutTraceRecursively:1' if opt else '_autolayoutTrace'
-    print fb.describeObject('[{} {}]'.format(view, traceCall))
+    print(fb.describeObject('[{} {}]'.format(view, traceCall)))
 
 
 def setBorderOnAmbiguousViewRecursive(view, width, color):

commands/FBClassDump.py

@@ -39,17 +39,17 @@ def run(self, arguments, options):
     cls = getClassFromArgument(arguments[0], options.clsname)
 
     if options.clsmethod:
-      print 'Class Methods:'
+      print('Class Methods:')
       printClassMethods(cls, options.showaddr)
 
     if options.insmethod:
-      print '\nInstance Methods:'
+      print('\nInstance Methods:')
       printInstanceMethods(cls, options.showaddr)
 
     if not options.clsmethod and not options.insmethod:
-      print 'Class Methods:'
+      print('Class Methods:')
       printClassMethods(cls, options.showaddr)
-      print '\nInstance Methods:'
+      print('\nInstance Methods:')
       printInstanceMethods(cls, options.showaddr)
 
 
@@ -147,15 +147,15 @@ def run(self, arguments, options):
 
     signature = json['signature']
     if not signature:
-      print 'Imp: ' + hex(json['invoke'])
+      print('Imp: ' + hex(json['invoke']))
       return 
 
     sigStr = '{} ^('.format(decode(signature[0]))
     # the block`s implementation always take the block as it`s first argument, so we ignore it
     sigStr += ', '.join([decode(m) for m in signature[2:]])
     sigStr += ');'
 
-    print  'Imp: ' + hex(json['invoke']) + '    Signature: ' + sigStr
+    print('Imp: ' + hex(json['invoke']) + '    Signature: ' + sigStr)
 
 # helpers 
 def isClassObject(arg):
@@ -178,21 +178,21 @@ def getClassFromArgument(arg, is_classname):
 def printInstanceMethods(cls, showaddr=False, prefix='-'):
   methods = getMethods(cls)
   if not methods:
-    print "No methods were found"
+    print("No methods were found")
 
   for m in methods:
     if showaddr:
-      print prefix + ' ' + m.prettyPrintString() + ' ' + str(m.imp)
+      print(prefix + ' ' + m.prettyPrintString() + ' ' + str(m.imp))
     else:
-      print prefix + ' ' + m.prettyPrintString()
+      print(prefix + ' ' + m.prettyPrintString())
 
 def printClassMethods(cls, showaddr=False):
   printInstanceMethods(runtimeHelpers.object_getClass(cls), showaddr, '+')
 
 def printProperties(cls, showvalue=False):
   props = getProperties(cls)
   for p in props:
-    print p.prettyPrintString()
+    print(p.prettyPrintString())
 
 def decode(code):
   encodeMap = {

commands/FBComponentCommands.py

@@ -35,12 +35,12 @@ def options(self):
   def run(self, arguments, options):
     if options.set:
       fb.evaluateEffect('[CKComponentDebugController setDebugMode:YES]')
-      print 'Debug mode for ComponentKit has been set.'
+      print('Debug mode for ComponentKit has been set.')
     elif options.unset:
       fb.evaluateEffect('[CKComponentDebugController setDebugMode:NO]')
-      print 'Debug mode for ComponentKit has been unset.'
+      print('Debug mode for ComponentKit has been unset.')
     else:
-      print 'No option for ComponentKit Debug mode specified.'
+      print('No option for ComponentKit Debug mode specified.')
 
 class FBComponentsPrintCommand(fb.FBCommand):
   def name(self):
@@ -67,7 +67,7 @@ def run(self, arguments, options):
         # assume it's a CKComponent
         view = fb.evaluateExpression('((CKComponent *)%s).viewContext.view' % view)
 
-    print fb.describeObject('[CKComponentHierarchyDebugHelper componentHierarchyDescriptionForView:(UIView *)' + view + ' searchUpwards:' + upwards + ' showViews:' + showViews + ']')
+    print(fb.describeObject('[CKComponentHierarchyDebugHelper componentHierarchyDescriptionForView:(UIView *)' + view + ' searchUpwards:' + upwards + ' showViews:' + showViews + ']'))
 
 class FBComponentsReflowCommand(fb.FBCommand):
   def name(self):

commands/FBDebugCommands.py

@@ -5,6 +5,9 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# Can be removed when Python 2 support is removed.
+from __future__ import print_function
+
 import lldb
 import fblldbbase as fb
 import fblldbobjcruntimehelpers as objc
@@ -58,9 +61,9 @@ def run(self, arguments, options):
     watchpoint = lldb.debugger.GetSelectedTarget().WatchAddress(objectAddress + ivarOffset, ivarSize, False, True, error)
 
     if error.Success():
-      print 'Remember to delete the watchpoint using: watchpoint delete {}'.format(watchpoint.GetID())
+      print('Remember to delete the watchpoint using: watchpoint delete {}'.format(watchpoint.GetID()))
     else:
-      print 'Could not create the watchpoint: {}'.format(error.GetCString())
+      print('Could not create the watchpoint: {}'.format(error.GetCString()))
 
 class FBFrameworkAddressBreakpointCommand(fb.FBCommand):
   def name(self):
@@ -108,12 +111,12 @@ def run(self, arguments, options):
     match = methodPattern.match(expression)
 
     if not match:
-      print 'Failed to parse expression. Do you even Objective-C?!'
+      print('Failed to parse expression. Do you even Objective-C?!')
       return
 
     expressionForSelf = objc.functionPreambleExpressionForSelf()
     if not expressionForSelf:
-      print 'Your architecture, {}, is truly fantastic. However, I don\'t currently support it.'.format(arch)
+      print('Your architecture, {}, is truly fantastic. However, I don\'t currently support it.'.format(arch))
       return
 
     methodTypeCharacter = match.group('scope')
@@ -139,7 +142,7 @@ def run(self, arguments, options):
     targetClass = fb.evaluateObjectExpression('[{} class]'.format(targetObject), False)
 
     if not targetClass or int(targetClass, 0) == 0:
-      print 'Couldn\'t find a class from the expression "{}". Did you typo?'.format(classNameOrExpression)
+      print('Couldn\'t find a class from the expression "{}". Did you typo?'.format(classNameOrExpression))
       return
 
     if methodIsClassMethod:
@@ -155,7 +158,7 @@ def run(self, arguments, options):
         nextClass = objc.class_getSuperclass(nextClass)
 
     if not found:
-      print 'There doesn\'t seem to be an implementation of {} in the class hierarchy. Made a boo boo with the selector name?'.format(selector)
+      print('There doesn\'t seem to be an implementation of {} in the class hierarchy. Made a boo boo with the selector name?'.format(selector))
       return
 
     breakpointClassName = objc.class_getName(nextClass)
@@ -167,7 +170,7 @@ def run(self, arguments, options):
     else:
       breakpointCondition = '(void*){} == {}'.format(expressionForSelf, targetObject)
 
-    print 'Setting a breakpoint at {} with condition {}'.format(breakpointFullName, breakpointCondition)
+    print('Setting a breakpoint at {} with condition {}'.format(breakpointFullName, breakpointCondition))
 
     if category:
       lldb.debugger.HandleCommand('breakpoint set --skip-prologue false --fullname "{}" --condition "{}"'.format(breakpointFullName, breakpointCondition))
@@ -205,11 +208,11 @@ def switchBreakpointState(expression,on):
   target = lldb.debugger.GetSelectedTarget()
   for breakpoint in target.breakpoint_iter():
     if breakpoint.IsEnabled() != on and (expression_pattern.search(str(breakpoint))):
-      print str(breakpoint)
+      print(str(breakpoint))
       breakpoint.SetEnabled(on)      
     for location in breakpoint:
       if location.IsEnabled() != on and (expression_pattern.search(str(location)) or expression == hex(location.GetAddress()) ):
-        print str(location)
+        print(str(location))
         location.SetEnabled(on)
 
 class FBMethodBreakpointEnableCommand(fb.FBCommand):
@@ -330,7 +333,7 @@ def run(self, arguments, options):
       return
 
     if len(arguments) == 0 or not arguments[0].strip():
-      print 'Usage: findinstances <classOrProtocol> [<predicate>]; Run `help findinstances`'
+      print('Usage: findinstances <classOrProtocol> [<predicate>]; Run `help findinstances`')
       return
 
     query = arguments[0]
@@ -348,7 +351,7 @@ def loadChiselIfNecessary(self):
 
     path = self.chiselLibraryPath()
     if not os.path.exists(path):
-      print 'Chisel library missing: ' + path
+      print('Chisel library missing: ' + path)
       return False
 
     module = fb.evaluateExpressionValue('(void*)dlopen("{}", 2)'.format(path))
@@ -361,17 +364,17 @@ def loadChiselIfNecessary(self):
     error = fb.evaluateExpressionValue('(char*)dlerror()')
     if errno == 50:
       # KERN_CODESIGN_ERROR from <mach/kern_return.h>
-      print 'Error loading Chisel: Code signing failure; Must re-run codesign'
+      print('Error loading Chisel: Code signing failure; Must re-run codesign')
     elif error.unsigned != 0:
-      print 'Error loading Chisel: ' + error.summary
+      print('Error loading Chisel: ' + error.summary)
     elif errno != 0:
       error = fb.evaluateExpressionValue('(char*)strerror({})'.format(errno))
       if error.unsigned != 0:
-        print 'Error loading Chisel: ' + error.summary
+        print('Error loading Chisel: ' + error.summary)
       else:
-        print 'Error loading Chisel (errno {})'.format(errno)
+        print('Error loading Chisel (errno {})'.format(errno))
     else:
-      print 'Unknown error loading Chisel'
+      print('Unknown error loading Chisel')
 
     return False
 
@@ -428,9 +431,9 @@ def isHeap(addr):
 
     allocations = (addr for addr in pointers if isHeap(addr))
     for addr in allocations:
-        print >>self.result, '0x{addr:x} {path}'.format(addr=addr, path=pointers[addr])
+        print('0x{addr:x} {path}'.format(addr=addr, path=pointers[addr]), file=self.result)
     if not allocations:
-        print >>self.result, "No heap addresses found"
+        print("No heap addresses found", file=self.result)
 
 
 class FBSequenceCommand(fb.FBCommand):
@@ -453,17 +456,17 @@ def run(self, arguments, options):
 
     # Complete one command before running the next one in the sequence. Disable
     # async to do this. Also, save the current async value to restore it later.
-    async = lldb.debugger.GetAsync()
+    asyncFlag = lldb.debugger.GetAsync()
     lldb.debugger.SetAsync(False)
 
     for command in commands[:-1]:
       success = self.run_command(interpreter, command)
       if not success:
-        lldb.debugger.SetAsync(async)
+        lldb.debugger.SetAsync(asyncFlag)
         return
 
     # Restore original async value.
-    lldb.debugger.SetAsync(async)
+    lldb.debugger.SetAsync(asyncFlag)
 
     # If the last command is `continue`, call Continue() on the process
     # instead. This is done because HandleCommand('continue') has strange
@@ -478,7 +481,7 @@ def run_command(self, interpreter, command):
     ret = lldb.SBCommandReturnObject()
     interpreter.HandleCommand(command, ret)
     if ret.GetOutput():
-      print >>self.result, ret.GetOutput().strip()
+      print(ret.GetOutput().strip(), file=self.result)
 
     if ret.Succeeded():
       return True

commands/FBFindCommands.py

@@ -120,6 +120,6 @@ def run(self, arguments, options):
   @staticmethod
   def taplog_callback(frame, bp_loc, internal_dict):
     parameterExpr = objc.functionPreambleExpressionForObjectParameterAtIndex(0)
-    print fb.describeObject('[[[%s allTouches] anyObject] view]' % (parameterExpr))
+    print(fb.describeObject('[[[%s allTouches] anyObject] view]' % (parameterExpr)))
     # We don't want to proceed event (click on button for example), so we just skip it
     lldb.debugger.HandleCommand('thread return')

commands/FBFlickerCommands.py

@@ -51,7 +51,7 @@ def args(self):
     return [ fb.FBCommandArgument(arg='view', type='UIView*', help='The view to border.') ]
 
   def run(self, arguments, options):
-    print '\nUse the following and (q) to quit.\n(w) move to superview\n(s) move to first subview\n(a) move to previous sibling\n(d) move to next sibling\n(p) print the hierarchy\n'
+    print('\nUse the following and (q) to quit.\n(w) move to superview\n(s) move to first subview\n(a) move to previous sibling\n(d) move to next sibling\n(p) print the hierarchy\n')
 
     object = fb.evaluateInputExpression(arguments[0])
     walker = FlickerWalker(object)
@@ -78,29 +78,29 @@ def inputCallback(self, input):
       cmd = 'echo %s | tr -d "\n" | pbcopy' % oldView
       os.system(cmd)
 
-      print '\nI hope ' + oldView + ' was what you were looking for. I put it on your clipboard.'
+      print('\nI hope ' + oldView + ' was what you were looking for. I put it on your clipboard.')
       viewHelpers.unmaskView(oldView)
       self.keepRunning = False
 
     elif input == 'w':
       v = superviewOfView(self.currentView)
       if not v:
-        print 'There is no superview. Where are you trying to go?!'
+        print('There is no superview. Where are you trying to go?!')
       self.setCurrentView(v, oldView)
     elif input == 's':
       v = firstSubviewOfView(self.currentView)
       if not v:
-        print '\nThe view has no subviews.\n'
+        print('\nThe view has no subviews.\n')
       self.setCurrentView(v, oldView)
     elif input == 'd':
       v = nthSiblingOfView(self.currentView, -1)
       if v == oldView:
-        print '\nThere are no sibling views to this view.\n'
+        print('\nThere are no sibling views to this view.\n')
       self.setCurrentView(v, oldView)
     elif input == 'a':
       v = nthSiblingOfView(self.currentView, 1)
       if v == oldView:
-        print '\nThere are no sibling views to this view.\n'
+        print('\nThere are no sibling views to this view.\n')
       self.setCurrentView(v, oldView)
     elif input == 'p':
       recursionName = 'recursiveDescription'
@@ -109,17 +109,17 @@ def inputCallback(self, input):
       if isMac:
         recursionName = '_subtreeDescription'
 
-      print fb.describeObject('[(id){} {}]'.format(oldView, recursionName))
+      print(fb.describeObject('[(id){} {}]'.format(oldView, recursionName)))
     else:
-      print '\nI really have no idea what you meant by \'' + input + '\'... =\\\n'
+      print('\nI really have no idea what you meant by \'' + input + '\'... =\\\n')
 
   def setCurrentView(self, view, oldView=None):
     if view:
       self.currentView = view
       if oldView:
         viewHelpers.unmaskView(oldView)
       viewHelpers.maskView(self.currentView, 'red', '0.4')
-      print fb.describeObject(view)
+      print(fb.describeObject(view))
 
 def superviewOfView(view):
   superview = fb.evaluateObjectExpression('[' + view + ' superview]')