Module: IRB::InputCompletor

# File 'lib/irb/completion.rb', line 460

def self.ignored_modules
  # We could cache the result, but this is very fast already.
  # By using this approach, we avoid Module#name calls, which are
  # relatively slow when there are a lot of anonymous modules defined.
  s = {}

  scanner = lambda do |m|
    next if s.include?(m) # IRB::ExtendCommandBundle::EXCB recurses.
    s[m] = true
    m.constants(false).each do |c|
      value = m.const_get(c)
      scanner.call(value) if value.is_a?(Module)
    end
  end

  %i(IRB RubyLex).each do |sym|
    next unless Object.const_defined?(sym)
    scanner.call(Object.const_get(sym))
  end

  s.delete(IRB::Context) if defined?(IRB::Context)

  s
end

# File 'lib/irb/completion.rb', line 169

def self.retrieve_completion_data(input, bind: IRB.conf[:MAIN_CONTEXT].workspace.binding, doc_namespace: false)
  case input
  when /^((["'`]).*\2)\.([^.]*)$/
    # String
    receiver = $1
    message = $3

    if doc_namespace
      "String.#{message}"
    else
      candidates = String.instance_methods.collect{|m| m.to_s}
      select_message(receiver, message, candidates)
    end

  when /^(\/[^\/]*\/)\.([^.]*)$/
    # Regexp
    receiver = $1
    message = $2

    if doc_namespace
      "Regexp.#{message}"
    else
      candidates = Regexp.instance_methods.collect{|m| m.to_s}
      select_message(receiver, message, candidates)
    end

  when /^([^\]]*\])\.([^.]*)$/
    # Array
    receiver = $1
    message = $2

    if doc_namespace
      "Array.#{message}"
    else
      candidates = Array.instance_methods.collect{|m| m.to_s}
      select_message(receiver, message, candidates)
    end

  when /^([^\}]*\})\.([^.]*)$/
    # Proc or Hash
    receiver = $1
    message = $2

    if doc_namespace
      ["Proc.#{message}", "Hash.#{message}"]
    else
      proc_candidates = Proc.instance_methods.collect{|m| m.to_s}
      hash_candidates = Hash.instance_methods.collect{|m| m.to_s}
      select_message(receiver, message, proc_candidates | hash_candidates)
    end

  when /^(:[^:.]*)$/
    # Symbol
    if doc_namespace
      nil
    else
      sym = $1
      candidates = Symbol.all_symbols.collect do |s|
        ":" + s.id2name.encode(Encoding.default_external)
      rescue EncodingError
        # ignore
      end
      candidates.grep(/^#{Regexp.quote(sym)}/)
    end
  when /^::([A-Z][^:\.\(\)]*)$/
    # Absolute Constant or class methods
    receiver = $1

    candidates = Object.constants.collect{|m| m.to_s}

    if doc_namespace
      candidates.find { |i| i == receiver }
    else
      candidates.grep(/^#{receiver}/).collect{|e| "::" + e}
    end

  when /^([A-Z].*)::([^:.]*)$/
    # Constant or class methods
    receiver = $1
    message = $2

    if doc_namespace
      "#{receiver}::#{message}"
    else
      begin
        candidates = eval("#{receiver}.constants.collect{|m| m.to_s}", bind)
        candidates |= eval("#{receiver}.methods.collect{|m| m.to_s}", bind)
      rescue Exception
        candidates = []
      end

      select_message(receiver, message, candidates.sort, "::")
    end

  when /^(:[^:.]+)(\.|::)([^.]*)$/
    # Symbol
    receiver = $1
    sep = $2
    message = $3

    if doc_namespace
      "Symbol.#{message}"
    else
      candidates = Symbol.instance_methods.collect{|m| m.to_s}
      select_message(receiver, message, candidates, sep)
    end

  when /^(?<num>-?(?:0[dbo])?[0-9_](?:\.[0-9_])?(?:(?:[eE][-]?[0-9])?i?|r)?)(?<sep>\.|::)(?<mes>[^.]*)$/
    # Numeric
    receiver = $~[:num]
    sep = $~[:sep]
    message = $~[:mes]

    begin
      instance = eval(receiver, bind)

      if doc_namespace
        "#{instance.class.name}.#{message}"
      else
        candidates = instance.methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates, sep)
      end
    rescue Exception
      if doc_namespace
        nil
      else
        []
      end
    end

  when /^(-?0x[0-9a-fA-F_]+)(\.|::)([^.]*)$/
    # Numeric(0xFFFF)
    receiver = $1
    sep = $2
    message = $3

    begin
      instance = eval(receiver, bind)
      if doc_namespace
        "#{instance.class.name}.#{message}"
      else
        candidates = instance.methods.collect{|m| m.to_s}
        select_message(receiver, message, candidates, sep)
      end
    rescue Exception
      if doc_namespace
        nil
      else
        []
      end
    end

  when /^(\$[^.]*)$/
    # global var
    gvar = $1
    all_gvars = global_variables.collect{|m| m.to_s}

    if doc_namespace
      all_gvars.find{ |i| i == gvar }
    else
      all_gvars.grep(Regexp.new(Regexp.quote(gvar)))
    end

  when /^([^.:"].*)(\.|::)([^.]*)$/
    # variable.func or func.func
    receiver = $1
    sep = $2
    message = $3

    gv = bind.eval_global_variables.collect{|m| m.to_s}.push("true", "false", "nil")
    lv = bind.local_variables.collect{|m| m.to_s}
    iv = bind.eval_instance_variables.collect{|m| m.to_s}
    cv = bind.eval_class_constants.collect{|m| m.to_s}

    if (gv | lv | iv | cv).include?(receiver) or /^[A-Z]/ =~ receiver && /\./ !~ receiver
      # foo.func and foo is var. OR
      # foo::func and foo is var. OR
      # foo::Const and foo is var. OR
      # Foo::Bar.func
      begin
        candidates = []
        rec = eval(receiver, bind)
        if sep == "::" and rec.kind_of?(Module)
          candidates = rec.constants.collect{|m| m.to_s}
        end
        candidates |= rec.methods.collect{|m| m.to_s}
      rescue Exception
        candidates = []
      end
    else
      # func1.func2
      candidates = []
      to_ignore = ignored_modules
      ObjectSpace.each_object(Module){|m|
        next if (to_ignore.include?(m) rescue true)
        next unless m.respond_to?(:instance_methods) # JRuby has modules that represent java packages. They don't include many common ruby methods
        candidates.concat m.instance_methods(false).collect{|x| x.to_s}
      }
      candidates.sort!
      candidates.uniq!
    end

    if doc_namespace
      rec_class = rec.is_a?(Module) ? rec : rec.class
      "#{rec_class.name}#{sep}#{candidates.find{ |i| i == message }}"
    else
      select_message(receiver, message, candidates, sep)
    end

  when /^\.([^.]*)$/
    # unknown(maybe String)

    receiver = ""
    message = $1

    candidates = String.instance_methods(true).collect{|m| m.to_s}

    if doc_namespace
      "String.#{candidates.find{ |i| i == message }}"
    else
      select_message(receiver, message, candidates.sort)
    end

  else
    if doc_namespace
      vars = (bind.local_variables | bind.eval_instance_variables).collect{|m| m.to_s}
      perfect_match_var = vars.find{|m| m.to_s == input}
      if perfect_match_var
        eval("#{perfect_match_var}.class.name", bind)
      else
        candidates = (bind.eval_methods | bind.eval_private_methods | bind.local_variables | bind.eval_instance_variables | bind.eval_class_constants).collect{|m| m.to_s}
        candidates |= ReservedWords
        candidates.find{ |i| i == input }
      end
    else
      candidates = (bind.eval_methods | bind.eval_private_methods | bind.local_variables | bind.eval_instance_variables | bind.eval_class_constants).collect{|m| m.to_s}
      candidates |= ReservedWords
      candidates.grep(/^#{Regexp.quote(input)}/).sort
    end
  end
end

# File 'lib/irb/completion.rb', line 97

def self.retrieve_files_to_require_from_load_path
  @@files_from_load_path ||=
    (
      shortest = []
      rest = retrieve_gem_and_system_load_path.each_with_object([]) { |path, result|
        begin
          names = Dir.glob("**/*.{rb,#{RbConfig::CONFIG['DLEXT']}}", base: path)
        rescue Errno::ENOENT
          nil
        end
        next if names.empty?
        names.map! { |n| n.sub(/\.(rb|#{RbConfig::CONFIG['DLEXT']})\z/, '') }.sort!
        shortest << names.shift
        result.concat(names)
      }
      shortest.sort! | rest
    )
end

# File 'lib/irb/completion.rb', line 116

def self.retrieve_files_to_require_relative_from_current_dir
  @@files_from_current_dir ||= Dir.glob("**/*.{rb,#{RbConfig::CONFIG['DLEXT']}}", base: '.').map { |path|
    path.sub(/\.(rb|#{RbConfig::CONFIG['DLEXT']})\z/, '')
  }
end

# File 'lib/irb/completion.rb', line 86

def self.retrieve_gem_and_system_load_path
  candidates = (GEM_PATHS | $LOAD_PATH)
  candidates.map do |p|
    if p.respond_to?(:to_path)
      p.to_path
    else
      String(p) rescue nil
    end
  end.compact.sort
end

# File 'lib/irb/completion.rb', line 448

def self.select_message(receiver, message, candidates, sep = ".")
  candidates.grep(/^#{Regexp.quote(message)}/).collect do |e|
    case e
    when /^[a-zA-Z_]/
      receiver + sep + e
    when /^[0-9]/
    when *Operators
      #receiver + " " + e
    end
  end
end