Class: Byebug::TraceCommand

Inherits:
Command
  • Object
show all
Defined in:
lib/byebug/commands/trace.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Command

commands, find, format_subcmd, format_subcmds, help, inherited, #initialize, load_commands, #match

Constructor Details

This class inherits a constructor from Byebug::Command

Class Method Details

.description ⇒ Object 



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# File 'lib/byebug/commands/trace.rb', line 32

def description
  %{tr[acevar] VARNAME [stop|nostop]\tset trace variable on VARNAME}
end

.names ⇒ Object 



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# File 'lib/byebug/commands/trace.rb', line 28

def names
  %w(trace)
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/byebug/commands/trace.rb', line 9

def execute
  varname = @match[1]
  if global_variables.include?("$#{varname}".to_sym)
    if @match[2] && @match[2] !~ /(:?no)?stop/
      errmsg "expecting \"stop\" or \"nostop\"; got \"#{@match[2]}\"\n"
    else
      dbg_cmd = (@match[2] && @match[2] !~ /nostop/) ? 'byebug(1, false)' : ''
    end
    eval("trace_var(:\"\$#{varname}\") do |val|
            print \"traced global variable '#{varname}' has value '\#{val}'\"\n
            #{dbg_cmd}
          end")
    print "Tracing global variable \"#{varname}\".\n"
  else
    errmsg "'#{varname}' is not a global variable.\n"
  end
end

#regexp ⇒ Object 



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# File 'lib/byebug/commands/trace.rb', line 3

def regexp
  /^\s* tr(?:acevar)? (?: \s+ (\S+))?  # (variable-name)?
                      (?: \s+ (\S+))?  # (stop | nostop)?
   \s*$/x
end