Class: Debugger::AddBreakpoint

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

Overview

Implements debugger “break” 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, register_setting_get, register_setting_set, register_setting_var, settings, settings_map

Constructor Details

This class inherits a constructor from Debugger::Command

Class Method Details

.help(cmd) ⇒ Object 



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# File 'lib/ruby-debug/commands/breakpoints.rb', line 102

def help(cmd)
  %{
    b[reak] file:line [if expr]
    b[reak] class(.|#)method [if expr]
    \tset breakpoint to some position, (optionally) if expr == true
  }
end

.help_command ⇒ Object 



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# File 'lib/ruby-debug/commands/breakpoints.rb', line 98

def help_command
  'break'
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/ruby-debug/commands/breakpoints.rb', line 16

def execute
  if @match[1]
    line, _, _, expr = @match.captures
  else
    _, file, line, expr = @match.captures
  end
  if expr 
    if expr !~ /^\s*if\s+(.+)/
      if file or line
        errmsg "Expecting 'if' in breakpoint condition; got: #{expr}.\n"
      else
        errmsg "Invalid breakpoint location: #{expr}.\n"
      end
      return
    else
      expr = $1
    end
  end

  brkpt_filename = nil
  if file.nil?
    unless @state.context
      errmsg "We are not in a state that has an associated file.\n"
      return 
    end
    brkpt_filename = @state.file
    file = File.basename(@state.file)
    if line.nil? 
      # Set breakpoint at current line
      line = @state.line.to_s
    end
  elsif line !~ /^\d+$/
    # See if "line" is a method/function name
    klass = debug_silent_eval(file)
    if klass && klass.kind_of?(Module)
      class_name = klass.name if klass
    else
      errmsg "Unknown class #{file}.\n"
      throw :debug_error
    end
  else
    # FIXME: This should be done in LineCache.
    file = File.expand_path(file) if file.index(File::SEPARATOR) || \
    File::ALT_SEPARATOR && file.index(File::ALT_SEPARATOR)
    brkpt_filename = file
  end
  
  if line =~ /^\d+$/
    line = line.to_i
    if LineCache.cache(brkpt_filename, Command.settings[:reload_source_on_change])
      last_line = LineCache.size(brkpt_filename)
      if line > last_line
        errmsg("There are only %d lines in file \"%s\".\n", last_line, file) 
        return
      end
      unless LineCache.trace_line_numbers(brkpt_filename).member?(line)
        errmsg("Line %d is not a stopping point in file \"%s\".\n", line, file) 
        return
      end
    else
      errmsg("No source file named %s\n" % file)
      return unless confirm("Set breakpoint anyway? (y/n) ")
    end

    unless @state.context
      errmsg "We are not in a state we can add breakpoints.\n"
      return 
    end
    b = Debugger.add_breakpoint brkpt_filename, line, expr
    print "Breakpoint %d file %s, line %s\n", b.id, brkpt_filename, line.to_s
    unless syntax_valid?(expr)
      errmsg("Expression \"#{expr}\" syntactically incorrect; breakpoint disabled.\n")
      b.enabled = false
    end
  else
    method = line.intern.id2name
    b = Debugger.add_breakpoint class_name, method, expr
    print "Breakpoint %d at %s::%s\n", b.id, class_name, method.to_s
  end
end

#regexp ⇒ Object 



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

def regexp
  / ^\s*
    b(?:reak)?
    (?: \s+ #{Position_regexp})? \s*
    (?: \s+ (.*))? \s*
    $
  /x
end