Class: Csharp2Swift

Inherits:
Object
  • Object
show all
Defined in:
lib/csharp_2_swift.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Csharp2Swift

Returns a new instance of Csharp2Swift.



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# File 'lib/csharp_2_swift.rb', line 10

def initialize
  @renamed_vars = {}
  @renamed_methods = {}
end

Instance Method Details

#constructors_to_inits(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 269

def constructors_to_inits(content)
  re = /(?:(?:public|internal|private) +|)class +(\w+)/
  m = re.match(content)
  while m != nil do
    content.gsub!(Regexp.new('(?:(?:public|internal) +|)' + m.captures[0] + " *\\("), 'init(')
    m = re.match(content, m.end(0))
  end

  content.gsub!(/init\((.*)\)/) { |m|
    'init(' + swap_args($1) + ')'
  }
end

#convert_bool_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 167

def convert_bool_type(content)
  content.gsub!(/\bbool\b/, 'Bool')
end

#convert_const_field(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 241

def convert_const_field(content)
  content.gsub!(/(^ *)(?:public|private|internal) +const +(.+?) +(.+?)( *= *.*?|)$/) { |m|
    v = $3
    nv = v.lower_camelcase
    @renamed_vars[v] = nv
    $1 + 'let ' + nv + ': ' + $2 + $4
  }
end

#convert_debug_assert(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 191

def convert_debug_assert(content)
  content.gsub!(/Debug\.Assert\(/, 'assert(')
end

#convert_double_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 175

def convert_double_type(content)
  content.gsub!(/\bdouble\b/, 'Double')
end

#convert_field(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 250

def convert_field(content)
  content.gsub!(/(^ *)(?:public|private|internal) +(\w+) +(\w+)( *= *.*?|)$/) { |m|
    $1 + 'private var ' + $3 + ': ' + $2 + $4
  }
end

#convert_float_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 171

def convert_float_type(content)
  content.gsub!(/\bfloat\b/, 'Float')
end

#convert_if(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 300

def convert_if(content)
  content.gsub!(/if *\((.*)\) +\{/, 'if \\1 {')
  content.gsub!(/if *\((.*?)\)\n( +)(.*?)\n/m) { |m|
    s = $2.length > 4 ? $2[0...-4] : s
    'if ' + $1 + " {\n" + $2 + $3 + "\n" + s + "}\n"
  }
end

#convert_int_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 159

def convert_int_type(content)
  content.gsub!(/\bint\b/, 'Int')
end

#convert_list_array_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 187

def convert_list_array_type(content)
  content.gsub!(/(?:List|IList)<(\w+)>\[\]/, '[[\\1]]')
end

#convert_list_list_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 183

def convert_list_list_type(content)
  content.gsub!(/(?:List|IList)<(?:List|IList)<(\w+)>>/, '[[\\1]]')
end

#convert_list_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 179

def convert_list_type(content)
  content.gsub!(/(?:List|IList)<(\w+)>/, '[\\1]')
end

#convert_locals(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 296

def convert_locals(content)
  content.gsub!(/^( *)(?!return|import)([A-Za-z0-9_\[\]<>]+) +(\w+)(?:( *= *.+)|)$/, '\\1let \\3\\4')
end

#convert_method_decl_to_func_decl(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 282

def convert_method_decl_to_func_decl(content)
  # TODO: Override should be captured and re-inserted
  content.gsub!(/(?:(?:public|internal|private) +)(?:override +|)(.+) +(.*)\((.*)\) *\{/) { |m|
    f = $2
    nf = f.lower_camelcase
    @renamed_methods[f] = nf
    if $1 == "void"
      'func ' + nf + '(' + swap_args($3) + ') {'
    else
      'func ' + nf + '(' + swap_args($3) + ') -> ' + $1 + ' {'
    end
  }
end

#convert_next_line_else(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 308

def convert_next_line_else(content)
  content.gsub!(/\}\n +else \{/m, '} else {')
end

#convert_property(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 256

def convert_property(content)
  content.gsub!(/(^ *)(?:public|private|internal) +(?!class)([A-Za-z0-9_\[\]<>]+) +(\w+)(?: *\{)/) { |m|
    v = $3
    nv = v.lower_camelcase
    @renamed_vars[v] = nv
    $1 + 'var ' + nv + ': ' + $2 + ' {'
  }
end

#convert_simple_range_for_loop(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 312

def convert_simple_range_for_loop(content)
  content.gsub!(/for \(.+ +(\w+) = (.+); \1 < (.*); \1\+\+\)/, 'for \\1 in \\2..<\\3')
  content.gsub!(/for \(.+ +(\w+) = (.+); \1 >= (.*); \1\-\-\)/, 'for \\1 in (\\3...\\2).reverse()')
end

#convert_string_type(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 163

def convert_string_type(content)
  content.gsub!(/\bstring\b/, 'Int')
end

#convert_this_to_self(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 143

def convert_this_to_self(content)
  content.gsub!(/this\./, 'self.')
end

#error(msg) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 336

def error(msg)
  STDERR.puts "error: #{msg}".red
end

#execute(args) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 60

def execute(args)
  options = self.parse(args)

  if !File.exist?(options.input_filename)
    error "File #{options.input_filename} does not exist"
    exit
  end

  if options.output_filename.length == 0
    error "An output file must be specified."
  end

  options.output_filename = File.expand_path(options.output_filename)
  content = read_file(options.input_filename)

  # Things that clean up the code and make other regex's easier
  remove_eol_semicolons(content)
  join_open_brace_to_last_line(content)
  remove_region(content)
  remove_endregion(content)
  remove_namespace_using(content)
  convert_this_to_self(content)
  convert_int_type(content)
  convert_string_type(content)
  convert_bool_type(content)
  convert_float_type(content)
  convert_double_type(content)
  convert_list_list_type(content)
  convert_list_array_type(content)
  convert_list_type(content)
  convert_debug_assert(content)
  remove_new(content)
  insert_import(content)

  # Slightly more complicated stuff
  remove_namespace(content)
  convert_property(content)
  remove_get_set(content)
  convert_const_field(content)
  convert_field(content)
  constructors_to_inits(content)
  convert_method_decl_to_func_decl(content)
  convert_locals(content)
  convert_if(content)
  convert_next_line_else(content)

  # Optional stuff
  convert_simple_range_for_loop(content) if options.convert_simple_for_loops

  # Global search/replace
  @renamed_vars.each { |v, nv|
    content.gsub!(Regexp.new("\\." + v + "\\b"), '.' + nv)
  }
  @renamed_methods.each { |m, nm|
    content.gsub!(Regexp.new('\\b' + m + '\\('), nm + '(')
  }

  write_file(options.output_filename, content)

  puts "\"#{options.input_filename}\" -> \"#{options.output_filename}\""

  @renamed_vars.each {|k,v| puts k + ' -> ' + v}
  @renamed_methods.each {|k,v| puts k + '() -> ' + v + '()'}
end

#insert_import(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 199

def insert_import(content)
  content.insert(0, "import Foundation\n")
end

#join_open_brace_to_last_line(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 129

def join_open_brace_to_last_line(content)
  re = / *\{$/m
  m = re.match(content)
  s = ' {'

  while m != nil do
    offset = m.offset(0)
    start = offset[0]
    content.slice!(offset[0]..offset[1])
    content.insert(start - 1, s)
    m = re.match(content, start - 1 + s.length)
  end
end

#parse(args) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 15

def parse(args)
  options = OpenStruct.new
  options.output_filename = ''
  options.input_filename = nil
  options.convert_simple_for_loops = false

  opt_parser = OptionParser.new do |opts|
    opts.banner = %Q(Roughly Convert C# to Swift. Version #{$VERSION}
Copyright (c) John Lyon-Smith, 2015.
Usage:            #{File.basename(__FILE__)} [options] FILE
)
    opts.separator %Q(Description:
This tool does a rough conversion of C# source code to Swift.  The goal of the tool
is to do most of the easy stuff that simply requires a lot of typing effort, and allow you
to concentrate on the more difficult aspects of the conversion, such as library and
framework usage.
)
    opts.separator %Q(Options:
)

    opts.on("-o", "--output FILE", String, "The output file.  Default is the same as the input file.") do |file|
      options.output_filename = File.expand_path(file)
    end

    opts.on("--convert_simple_for_loops", "Convert simple range based for loops, e.g. for(int i = 0; i < 10; i++) { }",
      "to range based loops of the form for i in 0..<10 { }") do |convert|
      options.convert_simple_for_loops = convert
    end

    opts.on_tail("-?", "--help", "Show this message") do
      puts opts
      exit
    end
  end

  opt_parser.parse!(args)
  options.input_filename = args.pop
  if options.input_filename == nil
    error 'Need to specify a file to process'
    exit
  end
  options.input_filename = File.expand_path(options.input_filename)
  options
end

#read_file(filename) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 326

def read_file(filename)
  content = nil
  File.open(filename, 'rb') { |f| content = f.read() }
  content
end

#remove_endregion(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 151

def remove_endregion(content)
  content.gsub!(/ *#endregion.*\n/, '')
end

#remove_eol_semicolons(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 125

def remove_eol_semicolons(content)
  content.gsub!(/; *$/m, '')
end

#remove_get_set(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 265

def remove_get_set(content)
  content.gsub!(/{ *get; *set; *}$/, '')
end

#remove_namespace(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 203

def remove_namespace(content)
  re = / *namespace +.+ *\{$/
  m = re.match(content)

  if m == nil
    return
  end

  i = m.end(0)
  n = 1
  bol = (content[i] == "\n")
  while i < content.length do
    c = content[i]

    if bol and c == " " and i + 3 < content.length
      content.slice!(i..(i + 3))
      c = content[i]
    end

    case c
      when "{"
        n += 1
      when "}"
        n -= 1
        if n == 0
          content.slice!(i) # Take out the end curly
          content.slice!(m.begin(0)..m.end(0)) # Take out the original namespace
          break
        end
      when "\n"
        bol = true
      else
        bol = false
    end
    i += 1
  end
end

#remove_namespace_using(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 155

def remove_namespace_using(content)
  content.gsub!(/ *using (?!\().*\n/, '')
end

#remove_new(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 195

def remove_new(content)
  content.gsub!(/new /, '')
end

#remove_region(content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 147

def remove_region(content)
  content.gsub!(/ *#region.*\n/, '')
end

#swap_args(arg_string) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 317

def swap_args(arg_string)
  args = arg_string.split(/, */)
  args.collect! { |arg|
    a = arg.split(' ')
    a[1] + ': ' + a[0]
  }
  args.join(', ')
end

#write_file(filename, content) ⇒ Object 



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# File 'lib/csharp_2_swift.rb', line 332

def write_file(filename, content)
  File.open(filename, 'w') { |f| f.write(content) }
end