← Back
Editing: irb.rb
# # irb.rb - irb main module # $Release Version: 0.9.6 $ # $Revision: 54322 $ # by Keiju ISHITSUKA(keiju@ruby-lang.org) # # -- # # # require "e2mmap" require "irb/init" require "irb/context" require "irb/extend-command" require "irb/ruby-lex" require "irb/input-method" require "irb/locale" STDOUT.sync = true # IRB stands for "interactive Ruby" and is a tool to interactively execute Ruby # expressions read from the standard input. # # The +irb+ command from your shell will start the interpreter. # # == Usage # # Use of irb is easy if you know Ruby. # # When executing irb, prompts are displayed as follows. Then, enter the Ruby # expression. An input is executed when it is syntactically complete. # # $ irb # irb(main):001:0> 1+2 # #=> 3 # irb(main):002:0> class Foo # irb(main):003:1> def foo # irb(main):004:2> print 1 # irb(main):005:2> end # irb(main):006:1> end # #=> nil # # The Readline extension module can be used with irb. Use of Readline is # default if it's installed. # # == Command line options # # Usage: irb.rb [options] [programfile] [arguments] # -f Suppress read of ~/.irbrc # -m Bc mode (load mathn, fraction or matrix are available) # -d Set $DEBUG to true (same as `ruby -d') # -r load-module Same as `ruby -r' # -I path Specify $LOAD_PATH directory # -U Same as `ruby -U` # -E enc Same as `ruby -E` # -w Same as `ruby -w` # -W[level=2] Same as `ruby -W` # --inspect Use `inspect' for output (default except for bc mode) # --noinspect Don't use inspect for output # --readline Use Readline extension module # --noreadline Don't use Readline extension module # --prompt prompt-mode # --prompt-mode prompt-mode # Switch prompt mode. Pre-defined prompt modes are # `default', `simple', `xmp' and `inf-ruby' # --inf-ruby-mode Use prompt appropriate for inf-ruby-mode on emacs. # Suppresses --readline. # --simple-prompt Simple prompt mode # --noprompt No prompt mode # --tracer Display trace for each execution of commands. # --back-trace-limit n # Display backtrace top n and tail n. The default # value is 16. # --irb_debug n Set internal debug level to n (not for popular use) # -v, --version Print the version of irb # # == Configuration # # IRB reads from <code>~/.irbrc</code> when it's invoked. # # If <code>~/.irbrc</code> doesn't exist, +irb+ will try to read in the following order: # # * +.irbrc+ # * +irb.rc+ # * +_irbrc+ # * <code>$irbrc</code> # # The following are alternatives to the command line options. To use them type # as follows in an +irb+ session: # # IRB.conf[:IRB_NAME]="irb" # IRB.conf[:MATH_MODE]=false # IRB.conf[:INSPECT_MODE]=nil # IRB.conf[:IRB_RC] = nil # IRB.conf[:BACK_TRACE_LIMIT]=16 # IRB.conf[:USE_LOADER] = false # IRB.conf[:USE_READLINE] = nil # IRB.conf[:USE_TRACER] = false # IRB.conf[:IGNORE_SIGINT] = true # IRB.conf[:IGNORE_EOF] = false # IRB.conf[:PROMPT_MODE] = :DEFAULT # IRB.conf[:PROMPT] = {...} # IRB.conf[:DEBUG_LEVEL]=0 # # === Auto indentation # # To enable auto-indent mode in irb, add the following to your +.irbrc+: # # IRB.conf[:AUTO_INDENT] = true # # === Autocompletion # # To enable autocompletion for irb, add the following to your +.irbrc+: # # require 'irb/completion' # # === History # # By default, irb disables history and will not store any commands you used. # # If you want to enable history, add the following to your +.irbrc+: # # IRB.conf[:SAVE_HISTORY] = 1000 # # This will now store the last 1000 commands in <code>~/.irb_history</code>. # # See IRB::Context#save_history= for more information. # # == Customizing the IRB Prompt # # In order to customize the prompt, you can change the following Hash: # # IRB.conf[:PROMPT] # # This example can be used in your +.irbrc+ # # IRB.conf[:PROMPT][:MY_PROMPT] = { # name of prompt mode # :AUTO_INDENT => true, # enables auto-indent mode # :PROMPT_I => ">> ", # simple prompt # :PROMPT_S => nil, # prompt for continuated strings # :PROMPT_C => nil, # prompt for continuated statement # :RETURN => " ==>%s\n" # format to return value # } # # IRB.conf[:PROMPT_MODE] = :MY_PROMPT # # Or, invoke irb with the above prompt mode by: # # irb --prompt my-prompt # # Constants +PROMPT_I+, +PROMPT_S+ and +PROMPT_C+ specify the format. In the # prompt specification, some special strings are available: # # %N # command name which is running # %m # to_s of main object (self) # %M # inspect of main object (self) # %l # type of string(", ', /, ]), `]' is inner %w[...] # %NNi # indent level. NN is digits and means as same as printf("%NNd"). # # It can be ommited # %NNn # line number. # %% # % # # For instance, the default prompt mode is defined as follows: # # IRB.conf[:PROMPT_MODE][:DEFAULT] = { # :PROMPT_I => "%N(%m):%03n:%i> ", # :PROMPT_S => "%N(%m):%03n:%i%l ", # :PROMPT_C => "%N(%m):%03n:%i* ", # :RETURN => "%s\n" # used to printf # } # # irb comes with a number of available modes: # # # :NULL: # # :PROMPT_I: # # :PROMPT_N: # # :PROMPT_S: # # :PROMPT_C: # # :RETURN: | # # %s # # :DEFAULT: # # :PROMPT_I: ! '%N(%m):%03n:%i> ' # # :PROMPT_N: ! '%N(%m):%03n:%i> ' # # :PROMPT_S: ! '%N(%m):%03n:%i%l ' # # :PROMPT_C: ! '%N(%m):%03n:%i* ' # # :RETURN: | # # => %s # # :CLASSIC: # # :PROMPT_I: ! '%N(%m):%03n:%i> ' # # :PROMPT_N: ! '%N(%m):%03n:%i> ' # # :PROMPT_S: ! '%N(%m):%03n:%i%l ' # # :PROMPT_C: ! '%N(%m):%03n:%i* ' # # :RETURN: | # # %s # # :SIMPLE: # # :PROMPT_I: ! '>> ' # # :PROMPT_N: ! '>> ' # # :PROMPT_S: # # :PROMPT_C: ! '?> ' # # :RETURN: | # # => %s # # :INF_RUBY: # # :PROMPT_I: ! '%N(%m):%03n:%i> ' # # :PROMPT_N: # # :PROMPT_S: # # :PROMPT_C: # # :RETURN: | # # %s # # :AUTO_INDENT: true # # :XMP: # # :PROMPT_I: # # :PROMPT_N: # # :PROMPT_S: # # :PROMPT_C: # # :RETURN: |2 # # ==>%s # # == Restrictions # # Because irb evaluates input immediately after it is syntactically complete, # the results may be slightly different than directly using Ruby. # # == IRB Sessions # # IRB has a special feature, that allows you to manage many sessions at once. # # You can create new sessions with Irb.irb, and get a list of current sessions # with the +jobs+ command in the prompt. # # === Commands # # JobManager provides commands to handle the current sessions: # # jobs # List of current sessions # fg # Switches to the session of the given number # kill # Kills the session with the given number # # The +exit+ command, or ::irb_exit, will quit the current session and call any # exit hooks with IRB.irb_at_exit. # # A few commands for loading files within the session are also available: # # +source+:: # Loads a given file in the current session and displays the source lines, # see IrbLoader#source_file # +irb_load+:: # Loads the given file similarly to Kernel#load, see IrbLoader#irb_load # +irb_require+:: # Loads the given file similarly to Kernel#require # # === Configuration # # The command line options, or IRB.conf, specify the default behavior of # Irb.irb. # # On the other hand, each conf in IRB@Command+line+options is used to # individually configure IRB.irb. # # If a proc is set for IRB.conf[:IRB_RC], its will be invoked after execution # of that proc with the context of the current session as its argument. Each # session can be configured using this mechanism. # # === Session variables # # There are a few variables in every Irb session that can come in handy: # # <code>_</code>:: # The value command executed, as a local variable # <code>__</code>:: # The history of evaluated commands # <code>__[line_no]</code>:: # Returns the evaluation value at the given line number, +line_no+. # If +line_no+ is a negative, the return value +line_no+ many lines before # the most recent return value. # # === Example using IRB Sessions # # # invoke a new session # irb(main):001:0> irb # # list open sessions # irb.1(main):001:0> jobs # #0->irb on main (#<Thread:0x400fb7e4> : stop) # #1->irb#1 on main (#<Thread:0x40125d64> : running) # # # change the active session # irb.1(main):002:0> fg 0 # # define class Foo in top-level session # irb(main):002:0> class Foo;end # # invoke a new session with the context of Foo # irb(main):003:0> irb Foo # # define Foo#foo # irb.2(Foo):001:0> def foo # irb.2(Foo):002:1> print 1 # irb.2(Foo):003:1> end # # # change the active session # irb.2(Foo):004:0> fg 0 # # list open sessions # irb(main):004:0> jobs # #0->irb on main (#<Thread:0x400fb7e4> : running) # #1->irb#1 on main (#<Thread:0x40125d64> : stop) # #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop) # # check if Foo#foo is available # irb(main):005:0> Foo.instance_methods #=> [:foo, ...] # # # change the active sesssion # irb(main):006:0> fg 2 # # define Foo#bar in the context of Foo # irb.2(Foo):005:0> def bar # irb.2(Foo):006:1> print "bar" # irb.2(Foo):007:1> end # irb.2(Foo):010:0> Foo.instance_methods #=> [:bar, :foo, ...] # # # change the active session # irb.2(Foo):011:0> fg 0 # irb(main):007:0> f = Foo.new #=> #<Foo:0x4010af3c> # # invoke a new session with the context of f (instance of Foo) # irb(main):008:0> irb f # # list open sessions # irb.3(<Foo:0x4010af3c>):001:0> jobs # #0->irb on main (#<Thread:0x400fb7e4> : stop) # #1->irb#1 on main (#<Thread:0x40125d64> : stop) # #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop) # #3->irb#3 on #<Foo:0x4010af3c> (#<Thread:0x4010a1e0> : running) # # evaluate f.foo # irb.3(<Foo:0x4010af3c>):002:0> foo #=> 1 => nil # # evaluate f.bar # irb.3(<Foo:0x4010af3c>):003:0> bar #=> bar => nil # # kill jobs 1, 2, and 3 # irb.3(<Foo:0x4010af3c>):004:0> kill 1, 2, 3 # # list open sesssions, should only include main session # irb(main):009:0> jobs # #0->irb on main (#<Thread:0x400fb7e4> : running) # # quit irb # irb(main):010:0> exit module IRB # An exception raised by IRB.irb_abort class Abort < Exception;end @CONF = {} # Displays current configuration. # # Modifing the configuration is achieved by sending a message to IRB.conf. # # See IRB@Configuration for more information. def IRB.conf @CONF end # Returns the current version of IRB, including release version and last # updated date. def IRB.version if v = @CONF[:VERSION] then return v end require "irb/version" rv = @RELEASE_VERSION.sub(/\.0/, "") @CONF[:VERSION] = format("irb %s(%s)", rv, @LAST_UPDATE_DATE) end # The current IRB::Context of the session, see IRB.conf # # irb # irb(main):001:0> IRB.CurrentContext.irb_name = "foo" # foo(main):002:0> IRB.conf[:MAIN_CONTEXT].irb_name #=> "foo" def IRB.CurrentContext IRB.conf[:MAIN_CONTEXT] end # Initializes IRB and creates a new Irb.irb object at the +TOPLEVEL_BINDING+ def IRB.start(ap_path = nil) $0 = File::basename(ap_path, ".rb") if ap_path IRB.setup(ap_path) if @CONF[:SCRIPT] irb = Irb.new(nil, @CONF[:SCRIPT]) else irb = Irb.new end @CONF[:IRB_RC].call(irb.context) if @CONF[:IRB_RC] @CONF[:MAIN_CONTEXT] = irb.context trap("SIGINT") do irb.signal_handle end begin catch(:IRB_EXIT) do irb.eval_input end ensure irb_at_exit end end # Calls each event hook of IRB.conf[:AT_EXIT] when the current session quits. def IRB.irb_at_exit @CONF[:AT_EXIT].each{|hook| hook.call} end # Quits irb def IRB.irb_exit(irb, ret) throw :IRB_EXIT, ret end # Aborts then interrupts irb. # # Will raise an Abort exception, or the given +exception+. def IRB.irb_abort(irb, exception = Abort) if defined? Thread irb.context.thread.raise exception, "abort then interrupt!" else raise exception, "abort then interrupt!" end end class Irb # Creates a new irb session def initialize(workspace = nil, input_method = nil, output_method = nil) @context = Context.new(self, workspace, input_method, output_method) @context.main.extend ExtendCommandBundle @signal_status = :IN_IRB @scanner = RubyLex.new @scanner.exception_on_syntax_error = false end # Returns the current context of this irb session attr_reader :context # The lexer used by this irb session attr_accessor :scanner # Evaluates input for this session. def eval_input @scanner.set_prompt do |ltype, indent, continue, line_no| if ltype f = @context.prompt_s elsif continue f = @context.prompt_c elsif indent > 0 f = @context.prompt_n else f = @context.prompt_i end f = "" unless f if @context.prompting? @context.io.prompt = p = prompt(f, ltype, indent, line_no) else @context.io.prompt = p = "" end if @context.auto_indent_mode unless ltype ind = prompt(@context.prompt_i, ltype, indent, line_no)[/.*\z/].size + indent * 2 - p.size ind += 2 if continue @context.io.prompt = p + " " * ind if ind > 0 end end end @scanner.set_input(@context.io) do signal_status(:IN_INPUT) do if l = @context.io.gets print l if @context.verbose? else if @context.ignore_eof? and @context.io.readable_after_eof? l = "\n" if @context.verbose? printf "Use \"exit\" to leave %s\n", @context.ap_name end else print "\n" end end l end end @scanner.each_top_level_statement do |line, line_no| signal_status(:IN_EVAL) do begin line.untaint @context.evaluate(line, line_no) output_value if @context.echo? exc = nil rescue Interrupt => exc rescue SystemExit, SignalException raise rescue Exception => exc end if exc print exc.class, ": ", exc, "\n" if exc.backtrace && exc.backtrace[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ && !(SyntaxError === exc) irb_bug = true else irb_bug = false end messages = [] lasts = [] levels = 0 if exc.backtrace for m in exc.backtrace m = @context.workspace.filter_backtrace(m) unless irb_bug if m if messages.size < @context.back_trace_limit messages.push "\tfrom "+m else lasts.push "\tfrom "+m if lasts.size > @context.back_trace_limit lasts.shift levels += 1 end end end end end print messages.join("\n"), "\n" unless lasts.empty? printf "... %d levels...\n", levels if levels > 0 print lasts.join("\n"), "\n" end print "Maybe IRB bug!\n" if irb_bug end if $SAFE > 2 abort "Error: irb does not work for $SAFE level higher than 2" end end end end # Evaluates the given block using the given +path+ as the Context#irb_path # and +name+ as the Context#irb_name. # # Used by the irb command +source+, see IRB@IRB+Sessions for more # information. def suspend_name(path = nil, name = nil) @context.irb_path, back_path = path, @context.irb_path if path @context.irb_name, back_name = name, @context.irb_name if name begin yield back_path, back_name ensure @context.irb_path = back_path if path @context.irb_name = back_name if name end end # Evaluates the given block using the given +workspace+ as the # Context#workspace. # # Used by the irb command +irb_load+, see IRB@IRB+Sessions for more # information. def suspend_workspace(workspace) @context.workspace, back_workspace = workspace, @context.workspace begin yield back_workspace ensure @context.workspace = back_workspace end end # Evaluates the given block using the given +input_method+ as the # Context#io. # # Used by the irb commands +source+ and +irb_load+, see IRB@IRB+Sessions # for more information. def suspend_input_method(input_method) back_io = @context.io @context.instance_eval{@io = input_method} begin yield back_io ensure @context.instance_eval{@io = back_io} end end # Evaluates the given block using the given +context+ as the Context. def suspend_context(context) @context, back_context = context, @context begin yield back_context ensure @context = back_context end end # Handler for the signal SIGINT, see Kernel#trap for more information. def signal_handle unless @context.ignore_sigint? print "\nabort!\n" if @context.verbose? exit end case @signal_status when :IN_INPUT print "^C\n" raise RubyLex::TerminateLineInput when :IN_EVAL IRB.irb_abort(self) when :IN_LOAD IRB.irb_abort(self, LoadAbort) when :IN_IRB # ignore else # ignore other cases as well end end # Evaluates the given block using the given +status+. def signal_status(status) return yield if @signal_status == :IN_LOAD signal_status_back = @signal_status @signal_status = status begin yield ensure @signal_status = signal_status_back end end def prompt(prompt, ltype, indent, line_no) # :nodoc: p = prompt.dup p.gsub!(/%([0-9]+)?([a-zA-Z])/) do case $2 when "N" @context.irb_name when "m" @context.main.to_s when "M" @context.main.inspect when "l" ltype when "i" if $1 format("%" + $1 + "d", indent) else indent.to_s end when "n" if $1 format("%" + $1 + "d", line_no) else line_no.to_s end when "%" "%" end end p end def output_value # :nodoc: printf @context.return_format, @context.inspect_last_value end # Outputs the local variables to this current session, including # #signal_status and #context, using IRB::Locale. def inspect ary = [] for iv in instance_variables case (iv = iv.to_s) when "@signal_status" ary.push format("%s=:%s", iv, @signal_status.id2name) when "@context" ary.push format("%s=%s", iv, eval(iv).__to_s__) else ary.push format("%s=%s", iv, eval(iv)) end end format("#<%s: %s>", self.class, ary.join(", ")) end end def @CONF.inspect IRB.version unless self[:VERSION] array = [] for k, v in sort{|a1, a2| a1[0].id2name <=> a2[0].id2name} case k when :MAIN_CONTEXT, :__TMP__EHV__ array.push format("CONF[:%s]=...myself...", k.id2name) when :PROMPT s = v.collect{ |kk, vv| ss = vv.collect{|kkk, vvv| ":#{kkk.id2name}=>#{vvv.inspect}"} format(":%s=>{%s}", kk.id2name, ss.join(", ")) } array.push format("CONF[:%s]={%s}", k.id2name, s.join(", ")) else array.push format("CONF[:%s]=%s", k.id2name, v.inspect) end end array.join("\n") end end
Save File
Cancel