Current File : //opt/alt/ruby19/lib64/ruby/1.9.1/irb.rb
#
# irb.rb - irb main module
# $Release Version: 0.9.6 $
# $Revision: 31641 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "e2mmap"
require "irb/init"
require "irb/context"
require "irb/extend-command"
#require "irb/workspace"
require "irb/ruby-lex"
require "irb/input-method"
require "irb/locale"
STDOUT.sync = true
module IRB
@RCS_ID='-$Id: irb.rb 31641 2011-05-19 00:07:25Z nobu $-'
class Abort < Exception;end
#
@CONF = {}
def IRB.conf
@CONF
end
# IRB version method
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
def IRB.CurrentContext
IRB.conf[:MAIN_CONTEXT]
end
# initialize IRB and start TOP_LEVEL irb
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
# print "\n"
end
def IRB.irb_at_exit
@CONF[:AT_EXIT].each{|hook| hook.call}
end
def IRB.irb_exit(irb, ret)
throw :IRB_EXIT, ret
end
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
#
# irb interpreter main routine
#
class Irb
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
attr_reader :context
attr_accessor :scanner
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_atfer_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[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
!(SyntaxError === exc)
irb_bug = true
else
irb_bug = false
end
messages = []
lasts = []
levels = 0
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
print messages.join("\n"), "\n"
unless lasts.empty?
printf "... %d levels...\n", levels if levels > 0
print lasts.join("\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
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
def suspend_workspace(workspace)
@context.workspace, back_workspace = workspace, @context.workspace
begin
yield back_workspace
ensure
@context.workspace = back_workspace
end
end
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
def suspend_context(context)
@context, back_context = context, @context
begin
yield back_context
ensure
@context = back_context
end
end
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
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)
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
printf @context.return_format, @context.inspect_last_value
end
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
# Singleton method
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