Class: SwiftTools::ObjC2Swift

Inherits:
Object
  • Object
show all
Defined in:
lib/objc_2_swift.rb

Constant Summary collapse

INDENT = 
'    '

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ObjC2Swift

Returns a new instance of ObjC2Swift.



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# File 'lib/objc_2_swift.rb', line 6

def initialize
end

Instance Method Details



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# File 'lib/objc_2_swift.rb', line 224

def capture_copyright(content)
  copyright = nil
  content.match(/^\s*\/\/.*Copyright.*$/) {|m|
    copyright = m[0]
  }
  copyright
end

#capture_implementation(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 327

def capture_implementation(content)
  implementations = {}
  content.scan(/^\s*@implementation *([a-zA-Z0-9_]+)((?:.|\n)*?)@end *\n$/m).each {|m|
    body = m[1]
    methods = extract_methods(body, in_hdr = false)

    implementations[m[0]] = {
        :methods => methods,
        :inits => []
    }
  }
  implementations
end

#capture_imports(h_filename, content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 232

def capture_imports(h_filename, content)
  r1 = ''
  r2 = ''
  content.to_enum(:scan, /[@#]import *"?([\.a-zA-Z0-9_]+)"? *;? *\n?/m).map { Regexp.last_match }.each {|m|
    s = m[0].strip
    if s.start_with?("#")
      if s.index(h_filename).nil?
        r2 += "// TODO: Add '#{s}' to bridging header\n"
      end
    else
      r1 += "import #{m[1]}\n"
    end
  }
  {:at_imports => r1, :hash_imports => r2}
end

#capture_interfaces(content, in_hdr) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 266

def capture_interfaces(content, in_hdr)
  interfaces = {}
  content.scan(/^\s*@interface\s*([a-zA-Z0-9_]+)(?:\s*:\s*([a-zA-Z0-9_]+)\s*)?(?:\s*\(([a-zA-Z0-9_, ]*)\))?(?:\s*<(.+)>)?((?:.|\n)*?)@end *\n$/m).each {|m|
    body = m[4]
    properties = extract_properties(body, in_hdr)
    methods = extract_methods(body, in_hdr)

    interfaces[m[0]] = {
      :base => m[1],
      :categories => m[2] == '' ? nil : m[2],
      :protocols => m[3],
      :properties => properties,
      :methods => methods,
      :inits => []
    }
  }
  interfaces
end

#capture_statics(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 248

def capture_statics(content)
  statics = ''
  content.scan(/static *(.*?);/m) {|m|
    decl = m[0]
    decl.gsub!('const', '')
    decl.gsub!('*', '')
    decl.gsub!('@"', '"')
    decl.scan(/([a-zA-Z0-9_\*]+) +([a-zA-Z0-9_\*]+)(?: *= *(.*))?/m) {|mm|
      statics += "// TODO: Add 'static let #{mm[1]}: #{map_type(mm[0])}"
      if mm[2]
        statics += " = #{mm[2]}"
      end
      statics += "' to one of your classes'\n"
    }
  }
  statics
end

#convert_block_to_closure(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 416

def convert_block_to_closure(content)
  content.gsub!(/\^(?:\(([a-zA-Z0-9_,\* ]+)\))?(?: |\n)*\{/m) {|m|
    if $1
      '{ ' + convert_param_list($1) + ' in '
    else
      '{\n'
    end
  }
end

#convert_param_list(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 426

def convert_param_list(content)
  params = ''
  content.split(/ *, */).each {|param|
    pair = param.split(' ')
    if params.length > 0
      params += ', '
    end
    params += "#{remove_ptr(pair[1])}: #{map_type(remove_ptr(pair[0]))}"
  }
  '(' + params + ')'
end

#convert_to_dot_syntax(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 341

def convert_to_dot_syntax(content)
  # Repeatedly find a [] syntax method call that does not have a nested [] call
  # and convert it until done.
  while m = content.match(/\[([^\[\]]+?)\]/) do
    # Parse m[0], convert to . syntax and substitute into 'content'
    body = m[1].strip
    params = []

    # Get the object name
    obj_match = body.match(/^([a-zA-Z0-9_\.\(\)]+)/)
    obj_name = obj_match[1]

    # Search for label with empty parameter list
    label_match = body.match(/(?:\n| )([a-zA-Z0-9_]+)/, obj_match.offset(0)[1])

    if label_match and label_match.offset(0)[1] >= body.length
      # There are no parameters
      params.push({:name => label_match[1], :value => nil})
    else
      # There are labelled parameters, start parsing them by searching for the labels
      param_label_re = /(?:\n| )+([a-zA-Z0-9_]+) *:/
      label_match = body.match(param_label_re, obj_match.offset(0)[1])

      begin
        arg = { :name => label_match[1]}

        if block_match = body.match(/ *(?:\(.*?\))?(?: |\n)\{/, label_match.offset(0)[1])
          end_of_param = find_close_char_offset(body, block_match.offset(0)[1], '{', '}') + 1
        else
          # Find the next arg label or the end of the string
          next_label_match = body.match(param_label_re, label_match.offset(0)[1])
          if next_label_match.nil?
            end_of_param = body.length
          else
            end_of_param = next_label_match.offset(0)[0]
          end
        end
        arg[:value] = body[label_match.offset(0)[1]...end_of_param]
        params.push(arg)
        label_match = next_label_match
      end until label_match.nil?
    end

    new_call = "#{obj_name}."
    params.each_index {|i|
      if i == 0
        new_call += params[i][:name] + '(' + (params[i][:value] || '')
      else
        new_call += ", #{params[i][:name]}: #{params[i][:value]}"
      end
    }
    new_call += ')'

    # Replace the orginal method call
    content[Range.make(m.offset(0), true)] = new_call
  end
end

#convert_underscore_props(content, properties) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 410

def convert_underscore_props(content, properties)
  properties.each {|prop_name, prop_data|
      content.gsub!(Regexp.new('\b_' + prop_name + '\b'), "self.#{prop_name}")
  }
end

#convert_var_decls(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 399

def convert_var_decls(content)
  # Note, this must be done _before_ removing EOL semicolons
  content.gsub!(/^( *)([a-zA-Z0-9_\*]+) +([a-zA-Z0-9_\*]+)(?: *= *(.*?))? *;/m) {|m|
    decl = "#{$1}var #{$3}: #{map_type(remove_ptr($2))}"
    if $4
      decl += " = #{$4}"
    end
    decl
  }
end

#execute(h_file, m_file, swift_file, options) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 9

def execute(h_file, m_file, swift_file, options)
  hdr_content = h_file.read()
  h_filename = File.basename(h_file.to_path)

  imports = capture_imports(h_filename, hdr_content)
  statics = capture_statics(hdr_content)
  interfaces = capture_interfaces(hdr_content, in_hdr = true)
  copyright = capture_copyright(hdr_content)

  unless m_file.nil?
    impl_content = m_file.read()
    implementations = capture_implementation(impl_content)
    impl_imports = capture_imports(h_filename, impl_content)
    impl_interfaces = capture_interfaces(impl_content, in_hdr = false)
  end

  # Add copyright
  unless copyright.nil?
    swift_file.write("//\n#{copyright}\n//\n\n")
  end

  # Combine all the imports
  swift_file.write(imports[:at_imports])
  swift_file.write(impl_imports[:at_imports]) unless impl_imports.nil?
  swift_file.write(imports[:hash_imports])
  swift_file.write(impl_imports[:hash_imports]) unless impl_imports.nil?
  swift_file.write("\n")

  # Write statics
  swift_file.write(statics)
  swift_file.write("\n")

  # Combine interfaces
  unless impl_interfaces.nil?
    impl_interfaces.each { |name, data|
      hdr_has_interface = interfaces.include?(name)
      interfaces[name][:properties].merge!(data[:properties]) if hdr_has_interface
      interfaces[name][:methods].merge!(data[:methods]) { |key, v1, v2|
        {
            :scope => v2[:scope],
            :return_type => v2[:return_type],
            :visibility => v1[:visibility]
        }
      } if hdr_has_interface
    }
  end

  # Combine implementations
  unless implementations.nil?
    implementations.each { |name, data|
      have_interface = interfaces.include?(name)
      interfaces[name][:methods].merge!(data[:methods]) { |key, v1, v2|
        {
            :scope => v1[:scope] || v2[:scope],
            :return_type => v1[:return_type],
            :visibility => v1[:visibility],
            :body => v2[:body]
        }
      } if have_interface
    }
  end

  # Output classes or extensions from interfaces
  interfaces.each {|interface_name, interface_data|
    swift_file.write("@objc class #{interface_name}")
    if interface_data[:base] != nil
      swift_file.write(": #{interface_data[:base]}")
    end
    if interface_data[:protocols] != nil
      swift_file.write(", #{interface_data[:protocols]}")
    end
    swift_file.write("{\n")

    # Create Swift singletons
    if interface_data[:methods].include?('sharedInstance')
      interface_data[:methods].delete('sharedInstance')
      interface_data[:properties]['sharedInstance'] = {
          :const => true,
          :visibility => :public,
          :scope => :static,
          :initializer => "#{interface_name}()"
      }
      interface_data[:inits].push({
          body: '',
          :visibility => :private
      })
    end

    # Add getter props
    new_properties = {}
    interface_data[:properties].each {|prop_name, prop_data|
      if prop_data[:getter]
        new_properties[prop_data[:getter]] = {
            :visibility => :public,
            :type => 'Bool',
            :scope => prop_data[:scope],
            :body => "return #{prop_name}"
        }

        # Remove :readonly if set and make private
        prop_data.delete(:readonly)
        prop_data[:visibility] = :private
      end
    }
    interface_data[:properties].merge!(new_properties)

    # line2 = INDENT + "public var #{prop_data[:getter]}: #{prop_data[:type]} { return #{prop_name} }\n"
    # if prop_data[:getter]
    #   line1 = INDENT + "private "

    # Write properties
    interface_data[:properties].each {|prop_name, prop_data|
      line = INDENT
      if prop_data[:readonly]
        line += "private(set) "
      elsif prop_data[:visibility] == :private
        line += 'private '
      end

      if prop_data[:scope] == :static
        line += "static "
      end

      if prop_data[:weak]
        line += 'weak '
      end

      if prop_data[:const]
        line += 'let '
      else
        line += 'var '
      end

      line += "#{prop_name}"

      if prop_data[:type]
        line += ": #{prop_data[:type]}"
      end

      if prop_data[:initializer]
        line += " = #{prop_data[:initializer]}"
      end

      if prop_data[:body]
        line += " {\n" + INDENT + INDENT + prop_data[:body] + "\n" + INDENT + "}"
      end

      line += "\n"

      swift_file.write(line)
    }

    # Write inits
    interface_data[:inits].each {|init_data|
      line = "\n" + INDENT

      if init_data[:visibility] == :private
        line += 'private '
      end

      if interface_data[:base]
        line += 'override '
      end

      line += "init() {"

      if init_data[:body].length > 0
        line += "\n" + body + "\n"
      end

      line += "}\n"
      swift_file.write(line)
    }

    # Write methods
    interface_data[:methods].each {|method_name, method_data|
      line = "\n" + INDENT

      if method_data[:visibility] == :private
        line += 'private '
      end

      line += "func #{method_name}()"
      if method_data[:return_type] and method_data[:return_type] != 'Void'
        line += " -> #{method_data[:return_type]}"
      end

      line += ' {'

      if method_data[:body].strip.length == 0
        line += "}\n"
      else
        body = method_data[:body]
        convert_var_decls(body)
        remove_eol_semicolons(body)
        convert_to_dot_syntax(body)
        convert_underscore_props(body, interface_data[:properties])
        convert_block_to_closure(body)
        fix_if_statements(body)
        fix_switch_statements(body)
        fix_yes_no(body)
        fix_null(body)
        fix_at_string(body)
        fix_broken_else(body)
        fix_alloc_init(body)
        line += body + INDENT + "}\n"
      end

      swift_file.write(line)
    }

    swift_file.write("}\n")
  }
end

#extract_methods(content, in_hdr) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 307

def extract_methods(content, in_hdr)
  methods = {}
  content.to_enum(:scan, /^ *(\+|-)? *\(([a-zA-Z0-9_]+)\) *([a-zA-Z0-9_]+)(?:[ \n]*\{)?/m).map { Regexp.last_match }.each {|m|
    if in_hdr
      body = ''
    else
      body_start_offset = m.offset(0)[1]
      body_end_offset = find_close_char_offset(content, body_start_offset, '{', '}') - 1
      body = indent_lines(content[body_start_offset..body_end_offset])
    end
    methods[m[3]] = {
      :scope => (m[1] == '+' ? :static : :instance),
      :return_type => map_type(remove_ptr(m[2])),
      :visibility => in_hdr ? :public : :private,
      :body => body
    }
  }
  methods
end

#extract_properties(content, in_hdr) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 285

def extract_properties(content, in_hdr)
  properties = {}
  content.scan(/^\s*@property\s*\(([a-zA-Z0-9_=, ]*)\)\s*([a-zA-Z0-9_\*]+)\s*([a-zA-Z0-9_\*]+)\s*/m) {|m|
    name = $3
    type = map_type(remove_ptr($2))
    options = Hash[$1.split(',').map(&:strip).collect {|s|
      a = s.split('=')
      if a.length > 1
        [a[0].to_sym, a[1]]
      else
        [a[0].to_sym, true]
      end
    }]
    properties[remove_ptr(name)] = {
        :type => type,
        :visibility => in_hdr ? :public : :private,
        :scope => :instance
    }.merge(options)
  }
  properties
end

#find_close_char_offset(content, offset, open_char, close_char) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 484

def find_close_char_offset(content, offset, open_char, close_char)
  count = 1
  loop do
    if offset >= content.length
      raise "Ran out of content looking for #{close_char}"
    elsif content[offset] == close_char
      count -= 1
      if count == 0
        break
      end
    elsif content[offset] == open_char
      count += 1
    end
    offset += 1
  end
  offset
end

#fix_alloc_init(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 438

def fix_alloc_init(content)
  content.gsub!(/([a-zA-Z0-9_]+)\.alloc\(\)\.init(?:With([a-zA-Z0-9_]+))?\(/) { |m|
    r = "#{$1}("
    if $2
      r += $2[0].downcase + $2[1..-1] + ': '
    end
  }
end

#fix_at_string(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 476

def fix_at_string(content)
  content.gsub!(/@"/, '"')
end

#fix_broken_else(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 472

def fix_broken_else(content)
  content.gsub!(/\}(?: |\n)*else(?: |\n)*\{/, '} else {')
end

#fix_if_statements(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 447

def fix_if_statements(content)
  content.gsub!(/if *\((.+?)\)(?: |\n)*{/m) {|m|
    "if #{$1} {"
  }
end

#fix_null(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 468

def fix_null(content)
  content.gsub!(/\bNULL\b/, 'nil')
end

#fix_switch_statements(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 453

def fix_switch_statements(content)
  content.gsub!(/switch *\((.+?)\)(?: |\n)*{/m) {|m|
    "switch #{$1} {"
  }
  content.gsub!(/^ *break *\n/m) {|m|
    ''
  }
end

#fix_yes_no(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 462

def fix_yes_no(content)
  content.gsub!(/\b(YES|NO)\b/) {|m|
    m == 'YES' ? 'true' : 'false'
  }
end

#indent_lines(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 502

def indent_lines(content)
  s = ''
  content.each_line {|line|
    s += INDENT + line
  }
  s
end

#map_type(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 514

def map_type(content)
  case content
  when 'BOOL'
    'Bool'
  when 'int'
    'Int'
  when 'uint'
    'UInt'
  when 'long'
    'Long'
  when 'void'
    'Void'
  when 'NSString'
    'String'
  when /(.*)\*/
    $1
  else
    content
  end
end

#remove_eol_semicolons(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 480

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

#remove_ptr(content) ⇒ Object 



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# File 'lib/objc_2_swift.rb', line 510

def remove_ptr(content)
  content.gsub('*', '')
end