Class: IRB::Irb
Overview
irb interpreter main routine
Instance Attribute Summary collapse
-
#context ⇒ Object
readonly
Returns the value of attribute context.
-
#scanner ⇒ Object
Returns the value of attribute scanner.
Instance Method Summary collapse
- #eval_input ⇒ Object
-
#initialize(workspace = nil, input_method = nil, output_method = nil) ⇒ Irb
constructor
A new instance of Irb.
- #inspect ⇒ Object
- #output_value ⇒ Object
- #prompt(prompt, ltype, indent, line_no) ⇒ Object
- #signal_handle ⇒ Object
- #signal_status(status) ⇒ Object
- #suspend_context(context) ⇒ Object
- #suspend_input_method(input_method) ⇒ Object
- #suspend_name(path = nil, name = nil) ⇒ Object
- #suspend_workspace(workspace) ⇒ Object
Constructor Details
#initialize(workspace = nil, input_method = nil, output_method = nil) ⇒ Irb
Returns a new instance of Irb.
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# File 'lib/irb.rb', line 98 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 |
Instance Attribute Details
#context ⇒ Object (readonly)
Returns the value of attribute context
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# File 'lib/irb.rb', line 106 def context @context end |
#scanner ⇒ Object
Returns the value of attribute scanner
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# File 'lib/irb.rb', line 107 def scanner @scanner end |
Instance Method Details
#eval_input ⇒ Object
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# File 'lib/irb.rb', line 109 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 = [] lasts = [] levels = 0 for m in exc.backtrace m = @context.workspace.filter_backtrace(m) unless irb_bug if m if .size < @context.back_trace_limit .push "\tfrom "+m else lasts.push "\tfrom "+m if lasts.size > @context.back_trace_limit lasts.shift levels += 1 end end end end print .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 |
#inspect ⇒ Object
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# File 'lib/irb.rb', line 314 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 |
#output_value ⇒ Object
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# File 'lib/irb.rb', line 310 def output_value printf @context.return_format, @context.inspect_last_value end |
#prompt(prompt, ltype, indent, line_no) ⇒ Object
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# File 'lib/irb.rb', line 279 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 |
#signal_handle ⇒ Object
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# File 'lib/irb.rb', line 246 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 |
#signal_status(status) ⇒ Object
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# File 'lib/irb.rb', line 267 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 |
#suspend_context(context) ⇒ Object
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# File 'lib/irb.rb', line 237 def suspend_context(context) @context, back_context = context, @context begin yield back_context ensure @context = back_context end end |
#suspend_input_method(input_method) ⇒ Object
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# File 'lib/irb.rb', line 227 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 |
#suspend_name(path = nil, name = nil) ⇒ Object
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# File 'lib/irb.rb', line 207 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 |
#suspend_workspace(workspace) ⇒ Object
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# File 'lib/irb.rb', line 218 def suspend_workspace(workspace) @context.workspace, back_workspace = workspace, @context.workspace begin yield back_workspace ensure @context.workspace = back_workspace end end |