Xcode script for generating/synthesizing properties

Question

Does anybody have an Xcode script for generating @property and @synthsize directives for instance variables in a class?

Answer 1

This is the one I came up with based on one I found a long time ago, rewritten in Python and with the improvements that it can generate multiple properties at once, among other things.

It will generate properties for all selected instance variable using (copy) as the attribute.

There are still some edge cases with multiple @interfaces or @implementations in a file, as well as some with unusual identifiers or asterisk placement (as in *const), but it should cover most typical coding styles. Feel free to edit/post modifications if you fix any of these cases.

#!/usr/bin/python

# Takes a header file with one or more instance variables selected
# and creates properties and synthesize directives for the selected properties.

# Accepts google-style instance variables with a tailing underscore and
# creates an appropriately named property without underscore.

# Entire Document
# Home Directory
# Discard Output
# Display in Alert

import os
import re
import subprocess

# AppleScripts for altering contents of files via Xcode
setFileContentsScript = """\
on run argv
  set fileAlias to POSIX file (item 1 of argv)
  set newDocText to (item 2 of argv)
    tell application "Xcode"
      set doc to open fileAlias
      set text of doc to newDocText
    end tell
end run \
"""

getFileContentsScript = """\
on run argv
  set fileAlias to POSIX file (item 1 of argv)
    tell application "Xcode"
      set doc to open fileAlias
      set docText to text of doc
  end tell
  return docText
end run \
"""

# Get variables from Xcode
headerFileText = """%%%{PBXAllText}%%%"""
selectionStartIndex = %%%{PBXSelectionStart}%%%
selectionEndIndex = %%%{PBXSelectionEnd}%%%
selectedText = headerFileText[selectionStartIndex:selectionEndIndex]

headerFilePath = """%%%{PBXFilePath}%%%"""

# Look for an implementation file with .m or .mm extension
implementationFilePath = headerFilePath[:-1] + "m"
if not os.path.exists(implementationFilePath):
    implementationFilePath += "m"

instanceVariablesRegex = re.compile(
  """^\s*((?:(?:\w+)\s+)*(?:(?:\w+)))""" + # Identifier(s)
  """([*]?)\\s*""" + # An optional asterisk
  """(\\w+?)(_?);""", # The variable name
  re.M)

# Now for each instance variable in the selected section
properties = ""
synthesizes = ""

for lineMatch in instanceVariablesRegex.findall(selectedText):
    types = " ".join(lineMatch[0].split()) # Clean up consequtive whitespace
    asterisk = lineMatch[1]
    variableName = lineMatch[2]
    trailingUnderscore = lineMatch[3]

    pointerPropertyAttributes = "(copy) " # Attributes if variable is pointer
    if not asterisk:
      pointerPropertyAttributes = ""

    newProperty = "@property %s%s %s%s;\n" % (pointerPropertyAttributes,
                                             types,
                                             asterisk,
                                             variableName)

    # If there's a trailing underscore, we need to let the synthesize
    # know which backing variable it's using
    newSynthesize = "@synthesize %s%s;\n" % (variableName,
                                           trailingUnderscore and
                                           " = %s_" % variableName)

    properties += newProperty
    synthesizes += newSynthesize

# Check to make sure at least 1 properties was found to generate
if not properties:
  os.sys.stderr.writelines("No properties found to generate")
  exit(-1)

# We want to insert the new properties either immediately after the last
# existing property or at the end of the instance variable section
findLastPropertyRegex = re.compile("^@interface.*?{.*?}.*?\\n" +
                                   "(?:.*^\\s*@property.*?\\n)?", re.M | re.S)
headerInsertIndex = findLastPropertyRegex.search(headerFileText).end()

# Add new lines on either side if this is the only property in the file
addedNewLine = "\n"
if re.search("^\s*@property", headerFileText, re.M):
  # Not the only property, don't add
  addedNewLine = ""

newHeaderFileText = "%s%s%s%s" % (headerFileText[:headerInsertIndex],
                                addedNewLine,
                                properties,
                                headerFileText[headerInsertIndex:])

subprocess.call(["osascript",
                "-e",
                setFileContentsScript,
                headerFilePath,
                newHeaderFileText])


if not os.path.exists(implementationFilePath):
  os.sys.stdout.writelines("No implementation file found")
  exit(0)

implementationFileText = subprocess.Popen(
  ["osascript",
   "-e",
  getFileContentsScript,
   implementationFilePath],
  stdout=subprocess.PIPE).communicate()[0]

# We want to insert the synthesizes either immediately after the last existing
# @synthesize or after the @implementation directive
lastSynthesizeRegex = re.compile("^\\s*@implementation.*?\\n" +
                                "(?:.*^\\s*@synthesize.*?\\n)?", re.M | re.S)

implementationInsertIndex = \
  lastSynthesizeRegex.search(implementationFileText).end()

# Add new lines on either side if this is the only synthesize in the file
addedNewLine = "\n"
if re.search("^\s*@synthesize", implementationFileText, re.M):
  # Not the only synthesize, don't add
  addedNewLine = ""

newImplementationFileText = "%s%s%s%s" % \
                  (implementationFileText[:implementationInsertIndex],
                   addedNewLine,
                   synthesizes,
                   implementationFileText[implementationInsertIndex:])

subprocess.call(["osascript",
                 "-e",
                 setFileContentsScript,
                 implementationFilePath,
                 newImplementationFileText])

# Switch Xcode back to header file
subprocess.Popen(["osascript",
                  "-e",
                  getFileContentsScript,
                  headerFilePath],
                 stdout=subprocess.PIPE).communicate()