Class: Trepan::Frame

Inherits:
Object
  • Object
show all
Defined in:
app/frame.rb

Overview

Call-Stack frame methods

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context, index = 0) ⇒ Frame

Returns a new instance of Frame.



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# File 'app/frame.rb', line 7

def initialize(context, index=0)
  @context = context
  @index = index
  @stack_size = @context.stack_size
  reset
end

Instance Attribute Details

#index ⇒ Object

Returns the value of attribute index.



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# File 'app/frame.rb', line 6

def index
  @index
end

#stack_size ⇒ Object

Returns the value of attribute stack_size.



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# File 'app/frame.rb', line 6

def stack_size
  @stack_size
end

Instance Method Details

#args ⇒ Object 



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# File 'app/frame.rb', line 98

def args
  @args ||= @context.frame_args(@index)
end

#binding ⇒ Object 



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# File 'app/frame.rb', line 33

def binding
  @binding ||= @context.frame_binding(@index)
end

#call_string(opts = {:maxwidth=>80, :callstyle => :last}) ⇒ Object 



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# File 'app/frame.rb', line 37

def call_string(opts={:maxwidth=>80, :callstyle => :last})
  call_str = ""
  if method_name
    locals = local_variables
    if opts[:callstyle] != :short && klass
      if opts[:callstyle] == :tracked
        arg_info = @context.frame_args_info(@index)
      end
      call_str << "#{klass}."
    end
    call_str << method_name
    if args.any?
      call_str << "("
      args.each_with_index do |name, i|
        case opts[:callstyle]
        when :short
          call_str += "%s, " % [name]
        when :last
          klass = locals[name].class
          if klass.inspect.size > 20+3
            klass = klass.inspect[0..20]+"..."
          end
          call_str += "%s#%s, " % [name, klass]
        when :tracked
          if arg_info && arg_info.size > i
            call_str += "#{name}: #{arg_info[i].inspect}, "
          else
            call_str += "%s, " % name
          end
        end
        if call_str.size > opts[:maxwidth]
          # Strip off trailing ', ' if any but add stuff for later trunc
          call_str[-2..-1] = ",...XX"
          break
        end
      end
      call_str[-2..-1] = ")" # Strip off trailing ', ' if any
    end
  end
  return call_str
end

#describe(opts = {:maxwidth => 80}) ⇒ Object 



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# File 'app/frame.rb', line 79

def describe(opts = {:maxwidth => 80})
  str       = ''
  # FIXME There seem to be bugs in showing call if
  # index != 0
  call_str  = index == 0 ? call_string(opts) : ''
  file = opts[:basename] ? File.basename(self.file) : self.file
  file_line = "at line %s:%d\n" % [file, line]
  unless call_str.empty?
    str += call_str + ' '
    if str.size + call_str.size + 1 + file_line.size > opts[:maxwidth]
      str += "\n       "
    else
      str += '  '
    end
  end
  str += file_line
  str
end

#file ⇒ Object 



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# File 'app/frame.rb', line 102

def file
  @file ||= @context.frame_file(@index)
end

#klass ⇒ Object 



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# File 'app/frame.rb', line 106

def klass
  @klass ||= @context.frame_class(@index)
end

#line ⇒ Object 



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# File 'app/frame.rb', line 110

def line
  @line ||= @context.frame_line(@index)
end

#local_variables ⇒ Object 



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# File 'app/frame.rb', line 114

def local_variables
  @local_variables ||= @context.frame_locals(@index)
end

#method_name ⇒ Object 



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# File 'app/frame.rb', line 118

def method_name
  if @method_name
    @method_name
  else
    m = @context.frame_method(@index)
    @method_name = m ? m.id2name : ''
  end
end

#reset ⇒ Object 



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# File 'app/frame.rb', line 14

def reset
  @binding = @klass = @file = @line =
    @local_variables = @method_name = @thread = nil
end

#run(code, filename = nil) ⇒ Object 



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# File 'app/frame.rb', line 28

def run(code, filename=nil)
  filename='(eval :%s)' % code unless filename
  eval(code, self.binding, filename)
end

#thread ⇒ Object 



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# File 'app/frame.rb', line 127

def thread
  @thread ||= @context.thread
end