Class: Debugger::JumpCommand

Inherits:
Command
  • Object
show all
Defined in:
lib/ruby-debug/commands/jump.rb

Overview

Implements debugger “jump” command

Constant Summary

Constants inherited from Command

Command::DEF_OPTIONS

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Command

commands, #find, inherited, #initialize, load_commands, #match, method_missing, options

Constructor Details

This class inherits a constructor from Debugger::Command

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Debugger::Command

Class Method Details

.help(cmd) ⇒ Object 



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# File 'lib/ruby-debug/commands/jump.rb', line 62

def help(cmd)
   %{
     j[ump] line\tjump to line number (absolute)
     j[ump] -line\tjump back to line (relative)
     j[ump] +line\tjump ahead to line (relative)

     Change the next line of code to be executed.
    }
end

.help_command ⇒ Object 



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# File 'lib/ruby-debug/commands/jump.rb', line 58

def help_command
  %w[jump]
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/ruby-debug/commands/jump.rb', line 20

def execute
  unless @state.context.respond_to?(:jump)
    print_msg "Not implemented"
    return
  end
  if !@match[1]
    print_msg "\"jump\" must be followed by a line number"
    return
  end
  if !numeric?(@match[1])
    print_msg "Bad line number: " + @match[1]
    return
  end
  line = @match[1].to_i
  line = @state.context.frame_line(0) + line if @match[1][0] == '+' or @match[1][0] == '-'
  if line == @state.context.frame_line(0)
    return
  end
  file = @match[2]
  file = @state.context.frame_file(file.to_i) if numeric?(file)
  file = @state.context.frame_file(0) if !file
  case @state.context.jump(line, file)
  when 0
    @state.proceed
    return
  when 1
    print_msg "Not possible to jump from here"
  when 2
    print_msg "Couldn't find debugged frame"
  when 3
    print_msg "Couldn't find active code at " + file + ":" + line.to_s
  else
    print_msg "Unknown error occurred"
  end
  @printer.print_at_line(@state.context, @state.context.frame_file, @state.context.frame_line)
end

#numeric?(object) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby-debug/commands/jump.rb', line 7

def numeric?(object)
  true if Float(object) rescue false
end

#regexp ⇒ Object 



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# File 'lib/ruby-debug/commands/jump.rb', line 11

def regexp
  / ^\s*
     j(?:ump)? \s*
     (?:\s+(\S+))?\s*
     (?:\s+(\S+))?\s*
     $
  /ix
end