summaryrefslogtreecommitdiff
path: root/lib/irb.rb
blob: b5f12a66f837043c41b951aaa7480880175dd089 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
#
#   irb.rb - irb main module
#   	$Release Version: 0.9 $
#   	$Revision$
#   	$Date$
#   	by Keiju ISHITSUKA(keiju@ishitsuka.com)
#
# --
#
#
#
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='-$Id$-'

  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.initialize(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
    
    catch(:IRB_EXIT) do
      irb.eval_input
    end
#    print "\n"
  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 interpriter main routine 
  #
  class Irb
    def initialize(workspace = nil, input_method = nil)
      @context = Context.new(self, workspace, input_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
	else @context.prompt_i
	  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).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
	    end
	  end
	  l
	end
      end

      @scanner.each_top_level_statement do
	|line, line_no|
	signal_status(:IN_EVAL) do
	  begin
	    @context.evaluate(line, line_no)
	    output_value if @context.echo?
	  rescue StandardError, ScriptError, Abort
	    $! = RuntimeError.new("unknown exception raised") unless $!
	    print $!.type, ": ", $!, "\n"
	    if  $@[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && $!.type.to_s !~ /^IRB/
	      irb_bug = true 
	    else
	      irb_bug = false
	    end
	    
	    messages = []
	    lasts = []
	    levels = 0
	    for m in $@
	      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
	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
      if @context.inspect?
        printf @context.return_format, @context.last_value.inspect
      else
        printf @context.return_format, @context.last_value
      end
    end

    def inspect
      ary = []
      for iv in instance_variables
	case iv
	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>", type, 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