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#
# irb/context.rb - irb context
# $Release Version: 0.9.6$
# $Revision$
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "irb/workspace"
require "irb/inspector"
module IRB
# A class that wraps the current state of the irb session, including the
# configuration of IRB.conf.
class Context
# Creates a new IRB context.
#
# The optional +input_method+ argument:
#
# +nil+:: uses stdin or Readline
# +String+:: uses a File
# +other+:: uses this as InputMethod
def initialize(irb, workspace = nil, input_method = nil, output_method = nil)
@irb = irb
if workspace
@workspace = workspace
else
@workspace = WorkSpace.new
end
@thread = Thread.current if defined? Thread
# copy of default configuration
@ap_name = IRB.conf[:AP_NAME]
@rc = IRB.conf[:RC]
@load_modules = IRB.conf[:LOAD_MODULES]
@use_readline = IRB.conf[:USE_READLINE]
@verbose = IRB.conf[:VERBOSE]
@io = nil
self.inspect_mode = IRB.conf[:INSPECT_MODE]
self.math_mode = IRB.conf[:MATH_MODE] if IRB.conf[:MATH_MODE]
self.use_tracer = IRB.conf[:USE_TRACER] if IRB.conf[:USE_TRACER]
self.use_loader = IRB.conf[:USE_LOADER] if IRB.conf[:USE_LOADER]
self.eval_history = IRB.conf[:EVAL_HISTORY] if IRB.conf[:EVAL_HISTORY]
@ignore_sigint = IRB.conf[:IGNORE_SIGINT]
@ignore_eof = IRB.conf[:IGNORE_EOF]
@back_trace_limit = IRB.conf[:BACK_TRACE_LIMIT]
self.prompt_mode = IRB.conf[:PROMPT_MODE]
if IRB.conf[:SINGLE_IRB] or !defined?(IRB::JobManager)
@irb_name = IRB.conf[:IRB_NAME]
else
@irb_name = IRB.conf[:IRB_NAME]+"#"+IRB.JobManager.n_jobs.to_s
end
@irb_path = "(" + @irb_name + ")"
case input_method
when nil
case use_readline?
when nil
if (defined?(ReadlineInputMethod) && STDIN.tty? &&
IRB.conf[:PROMPT_MODE] != :INF_RUBY)
@io = ReadlineInputMethod.new
else
@io = StdioInputMethod.new
end
when false
@io = StdioInputMethod.new
when true
if defined?(ReadlineInputMethod)
@io = ReadlineInputMethod.new
else
@io = StdioInputMethod.new
end
end
when String
@io = FileInputMethod.new(input_method)
@irb_name = File.basename(input_method)
@irb_path = input_method
else
@io = input_method
end
self.save_history = IRB.conf[:SAVE_HISTORY] if IRB.conf[:SAVE_HISTORY]
if output_method
@output_method = output_method
else
@output_method = StdioOutputMethod.new
end
@echo = IRB.conf[:ECHO]
if @echo.nil?
@echo = true
end
self.debug_level = IRB.conf[:DEBUG_LEVEL]
end
# The top-level workspace, see WorkSpace#main
def main
@workspace.main
end
# The toplevel workspace, see #home_workspace
attr_reader :workspace_home
# WorkSpace in the current context
attr_accessor :workspace
# The current thread in this context
attr_reader :thread
# The current input method
#
# Can be either StdioInputMethod, ReadlineInputMethod, FileInputMethod or
# other specified when the context is created. See ::new for more
# information on +input_method+.
attr_accessor :io
# Current irb session
attr_accessor :irb
# A copy of the default <code>IRB.conf[:AP_NAME]</code>
attr_accessor :ap_name
# A copy of the default <code>IRB.conf[:RC]</code>
attr_accessor :rc
# A copy of the default <code>IRB.conf[:LOAD_MODULES]</code>
attr_accessor :load_modules
# Can be either name from <code>IRB.conf[:IRB_NAME]</code>, or the number of
# the current job set by JobManager, such as <code>irb#2</code>
attr_accessor :irb_name
# Can be either the #irb_name surrounded by parenthesis, or the
# +input_method+ passed to Context.new
attr_accessor :irb_path
# Whether +Readline+ is enabled or not.
#
# A copy of the default <code>IRB.conf[:USE_READLINE]</code>
#
# See #use_readline= for more information.
attr_reader :use_readline
# A copy of the default <code>IRB.conf[:INSPECT_MODE]</code>
attr_reader :inspect_mode
# A copy of the default <code>IRB.conf[:PROMPT_MODE]</code>
attr_reader :prompt_mode
# Standard IRB prompt
#
# See IRB@Customizing+the+IRB+Prompt for more information.
attr_accessor :prompt_i
# IRB prompt for continuated strings
#
# See IRB@Customizing+the+IRB+Prompt for more information.
attr_accessor :prompt_s
# IRB prompt for continuated statement (e.g. immediately after an +if+)
#
# See IRB@Customizing+the+IRB+Prompt for more information.
attr_accessor :prompt_c
# See IRB@Customizing+the+IRB+Prompt for more information.
attr_accessor :prompt_n
# Can be either the default <code>IRB.conf[:AUTO_INDENT]</code>, or the
# mode set by #prompt_mode=
#
# To enable auto-indentation in irb:
#
# IRB.conf[:AUTO_INDENT] = true
#
# or
#
# irb_context.auto_indent_mode = true
#
# or
#
# IRB.CurrentContext.auto_indent_mode = true
#
# See IRB@Configuration for more information.
attr_accessor :auto_indent_mode
# The format of the return statement, set by #prompt_mode= using the
# +:RETURN+ of the +mode+ passed to set the current #prompt_mode.
attr_accessor :return_format
# Whether <code>^C</code> (+control-c+) will be ignored or not.
#
# If set to +false+, <code>^C</code> will quit irb.
#
# If set to +true+,
#
# * during input: cancel input then return to top level.
# * during execute: abandon current execution.
attr_accessor :ignore_sigint
# Whether <code>^D</code> (+control-d+) will be ignored or not.
#
# If set to +false+, <code>^D</code> will quit irb.
attr_accessor :ignore_eof
# Whether to echo the return value to output or not.
#
# Uses IRB.conf[:ECHO] if available, or defaults to +true+.
#
# puts "hello"
# # hello
# #=> nil
# IRB.CurrentContext.echo = false
# puts "omg"
# # omg
attr_accessor :echo
# Whether verbose messages are displayed or not.
#
# A copy of the default <code>IRB.conf[:VERBOSE]</code>
attr_accessor :verbose
# The debug level of irb
#
# See #debug_level= for more information.
attr_reader :debug_level
# The limit of backtrace lines displayed as top +n+ and tail +n+.
#
# The default value is 16.
#
# Can also be set using the +--back-trace-limit+ command line option.
#
# See IRB@Command+line+options for more command line options.
attr_accessor :back_trace_limit
# Alias for #use_readline
alias use_readline? use_readline
# Alias for #rc
alias rc? rc
alias ignore_sigint? ignore_sigint
alias ignore_eof? ignore_eof
alias echo? echo
# Returns whether messages are displayed or not.
def verbose?
if @verbose.nil?
if defined?(ReadlineInputMethod) && @io.kind_of?(ReadlineInputMethod)
false
elsif !STDIN.tty? or @io.kind_of?(FileInputMethod)
true
else
false
end
else
@verbose
end
end
# Whether #verbose? is +true+, and +input_method+ is either
# StdioInputMethod or ReadlineInputMethod, see #io for more information.
def prompting?
verbose? || (STDIN.tty? && @io.kind_of?(StdioInputMethod) ||
(defined?(ReadlineInputMethod) && @io.kind_of?(ReadlineInputMethod)))
end
# The return value of the last statement evaluated.
attr_reader :last_value
# Sets the return value from the last statement evaluated in this context
# to #last_value.
def set_last_value(value)
@last_value = value
@workspace.evaluate self, "_ = IRB.CurrentContext.last_value"
end
# Sets the +mode+ of the prompt in this context.
#
# See IRB@Customizing+the+IRB+Prompt for more information.
def prompt_mode=(mode)
@prompt_mode = mode
pconf = IRB.conf[:PROMPT][mode]
@prompt_i = pconf[:PROMPT_I]
@prompt_s = pconf[:PROMPT_S]
@prompt_c = pconf[:PROMPT_C]
@prompt_n = pconf[:PROMPT_N]
@return_format = pconf[:RETURN]
if ai = pconf.include?(:AUTO_INDENT)
@auto_indent_mode = ai
else
@auto_indent_mode = IRB.conf[:AUTO_INDENT]
end
end
# Whether #inspect_mode is set or not, see #inspect_mode= for more detail.
def inspect?
@inspect_mode.nil? or @inspect_mode
end
# Whether #io uses a File for the +input_method+ passed when creating the
# current context, see ::new
def file_input?
@io.class == FileInputMethod
end
# Specifies the inspect mode with +opt+:
#
# +true+:: display +inspect+
# +false+:: display +to_s+
# +nil+:: inspect mode in non-math mode,
# non-inspect mode in math mode
#
# See IRB::Inspector for more information.
#
# Can also be set using the +--inspect+ and +--noinspect+ command line
# options.
#
# See IRB@Command+line+options for more command line options.
def inspect_mode=(opt)
if i = Inspector::INSPECTORS[opt]
@inspect_mode = opt
@inspect_method = i
i.init
else
case opt
when nil
if Inspector.keys_with_inspector(Inspector::INSPECTORS[true]).include?(@inspect_mode)
self.inspect_mode = false
elsif Inspector.keys_with_inspector(Inspector::INSPECTORS[false]).include?(@inspect_mode)
self.inspect_mode = true
else
puts "Can't switch inspect mode."
return
end
when /^\s*\{.*\}\s*$/
begin
inspector = eval "proc#{opt}"
rescue Exception
puts "Can't switch inspect mode(#{opt})."
return
end
self.inspect_mode = inspector
when Proc
self.inspect_mode = IRB::Inspector(opt)
when Inspector
prefix = "usr%d"
i = 1
while Inspector::INSPECTORS[format(prefix, i)]; i += 1; end
@inspect_mode = format(prefix, i)
@inspect_method = opt
Inspector.def_inspector(format(prefix, i), @inspect_method)
else
puts "Can't switch inspect mode(#{opt})."
return
end
end
print "Switch to#{unless @inspect_mode; ' non';end} inspect mode.\n" if verbose?
@inspect_mode
end
# Obsolete method.
#
# Can be set using the +--noreadline+ and +--readline+ command line
# options.
#
# See IRB@Command+line+options for more command line options.
def use_readline=(opt)
print "This method is obsolete."
print "Do nothing."
end
# Sets the debug level of irb
#
# Can also be set using the +--irb_debug+ command line option.
#
# See IRB@Command+line+options for more command line options.
def debug_level=(value)
@debug_level = value
RubyLex.debug_level = value
end
# Whether or not debug mode is enabled, see #debug_level=.
def debug?
@debug_level > 0
end
def evaluate(line, line_no) # :nodoc:
@line_no = line_no
set_last_value(@workspace.evaluate(self, line, irb_path, line_no))
end
def inspect_last_value # :nodoc:
@inspect_method.inspect_value(@last_value)
end
alias __exit__ exit
# Exits the current session, see IRB.irb_exit
def exit(ret = 0)
IRB.irb_exit(@irb, ret)
end
NOPRINTING_IVARS = ["@last_value"] # :nodoc:
NO_INSPECTING_IVARS = ["@irb", "@io"] # :nodoc:
IDNAME_IVARS = ["@prompt_mode"] # :nodoc:
alias __inspect__ inspect
def inspect # :nodoc:
array = []
for ivar in instance_variables.sort{|e1, e2| e1 <=> e2}
ivar = ivar.to_s
name = ivar.sub(/^@(.*)$/, '\1')
val = instance_eval(ivar)
case ivar
when *NOPRINTING_IVARS
array.push format("conf.%s=%s", name, "...")
when *NO_INSPECTING_IVARS
array.push format("conf.%s=%s", name, val.to_s)
when *IDNAME_IVARS
array.push format("conf.%s=:%s", name, val.id2name)
else
array.push format("conf.%s=%s", name, val.inspect)
end
end
array.join("\n")
end
alias __to_s__ to_s
alias to_s inspect
end
end
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