Class: Nendo::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/nendo/ruby/reader.rb

Constant Summary collapse

T_EOF =

tokens

:t_eof
T_LPAREN = 
:t_lparen
T_RPAREN = 
:t_rparen
T_LVECTOR = 
:t_lvector
T_SYMBOL = 
:t_symbol
T_KEYWORD = 
:t_keyword
T_NUM = 
:t_num
T_STRING = 
:t_string
T_QUOTE = 
:t_quote
T_QUASIQUOTE = 
:t_quasiquote
T_UNQUOTE = 
:t_unquote
T_UNQUOTE_SPLICING = 
:t_unquote_splicing
T_FEEDTO = 
:t_feedto
T_DOT = 
:t_dot
T_LINEFEED = 
:t_linefeed
T_COMMENT = 
:t_comment
T_DEBUG_PRINT = 
:t_debug_print
T_MACRO_DEBUG_PRINT = 
:t_macro_debug_print
T_REGEXP = 
:t_regexp

Instance Method Summary collapse

Constructor Details

#initialize(inport, sourcefile, debug = false) ⇒ Reader

inport is IO class



104
105
106
107
108
109
110
 
# File 'lib/nendo/ruby/reader.rb', line 104

def initialize( inport, sourcefile, debug = false )
  @inport     = inport
  @sourcefile = sourcefile
  @chReader   = nil
  @curtoken   = nil
  @debug      = debug
end

Instance Method Details

#_read ⇒ Object

return value is [ S-expression-tree, eof-flag, valid-sexp-flag ]



570
571
572
573
574
575
576
577
578
579
580
581
 
# File 'lib/nendo/ruby/reader.rb', line 570

def _read
  @chReader = CharReader.new( @inport, @sourcefile )  unless @chReader
  case curtoken.kind
  when T_EOF
    [ Nil.new, true,  false ]
  when T_LINEFEED
    token
    [ Nil.new, false, false ]
  else
    [ sexp(),  false, true  ]
  end
end

#atom ⇒ Object 



370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
 
# File 'lib/nendo/ruby/reader.rb', line 370

def atom
  cur = curtoken
  printf( "  NonT: [%s] : [%s]\n", "atom", cur.str ) if @debug
  token
  case cur.kind
  when T_SYMBOL
    sym = cur.str.intern
    case sym
    when :true
      true
    when :false
      false
    when :nil
      nil
    else
      ParsedSymbol.new( sym, cur.sourcefile, cur.lineno )
    end
  when T_NUM
    if cur.str.match( /[.]/ ) # floating point
      cur.str.to_f
    else
      cur.str.to_i
    end
  when T_STRING
    cur.str
  when T_REGEXP
    LispRegexp.new( cur.str )
  when T_QUOTE
    :quote
  when T_QUASIQUOTE
    :quasiquote
  when T_UNQUOTE
    :unquote
  when T_UNQUOTE_SPLICING
    :"unquote-splicing"
  when T_DOT
    :"dot-operator"
  when T_FEEDTO
    :feedto
  when T_DEBUG_PRINT
    "debug-print".intern
  when T_MACRO_DEBUG_PRINT
    LispString.new( sprintf( "%s:%d", cur.sourcefile, cur.lineno ))
  when T_KEYWORD
    LispKeyword.new( cur.str )
  else
    raise "Error: Unknown token in atom()"
  end
end

#curtoken ⇒ Object 



363
364
365
366
367
368
 
# File 'lib/nendo/ruby/reader.rb', line 363

def curtoken
  if !@curtoken
    self.token
  end
  @curtoken
end

#lineno ⇒ Object 



120
121
122
123
124
125
126
 
# File 'lib/nendo/ruby/reader.rb', line 120

def lineno
  if @chReader
    @chReader.lineno
  else
    1
  end
end

#list ⇒ Object

list := sexp

| atom ... atom
| atom ... . atom



454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
 
# File 'lib/nendo/ruby/reader.rb', line 454

def list
  printf( "  NonT: [%s]\n", "list" ) if @debug
  dotted = false
  cells = []
  lastAtom = Nil.new
  while true
    case curtoken.kind
    when T_LINEFEED
      token # skipEnter
    when T_EOF
      begin
        raise RuntimeError, "Error: unbalanced paren(1)"
      rescue => e
        e.set_backtrace( [sprintf( "%s:%d", curtoken.sourcefile, curtoken.lineno )] + e.backtrace )
        raise e
      end
    when T_LPAREN, T_LVECTOR
      cells << Cell.new( sexp() )
    when T_RPAREN
      break
    when T_DOT
      if 0 == cells.length
        # (. symbol1 symbol2 ... ) form
        cells << Cell.new( atom() )
      else
        # ( symbol1 ... symbol2 . symbol3 ) form
        token
        lastAtom = sexp()
        if lastAtom.is_a? Cell and lastAtom.isNull
          lastAtom = Nil.new # the null list "()"  could not be a lastAtom.
        end
      end
    when T_QUOTE , T_QUASIQUOTE , T_UNQUOTE , T_UNQUOTE_SPLICING, T_DEBUG_PRINT
      cells << Cell.new( sexp() )
    else
      if not lastAtom.is_a? Nil
        raise "Error : illegal dotted pair syntax."
      else
        cells << Cell.new( atom() )
      end
    end
  end
  ## setup list
  if 0 == cells.size
    Cell.new() # null list
  elsif 1 == cells.size
    cells.first.cdr = lastAtom
    cells.first
  elsif 1 < cells.size
    ptr = cells.pop
    ptr.cdr = lastAtom
    cells.reverse.each { |x|
      x.cdr = ptr
      ptr = x
    }
    cells.first
  end
end

#peekchar(exp) ⇒ Object 



156
157
158
159
160
161
162
163
164
165
166
167
168
 
# File 'lib/nendo/ruby/reader.rb', line 156

def peekchar( exp )
  ch = @chReader.getc
  #printf( "      peekchar: [%02x]\n", ch ) if @debug
  if !ch # eof?
    return nil
  end
  if ch.chr.match( exp )
    ch.chr
  else
    @chReader.ungetc( ch )
    nil
  end
end

#readRegexp ⇒ Object 



204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
 
# File 'lib/nendo/ruby/reader.rb', line 204

def readRegexp()
  ret = ""
  while true
    ch = @chReader.getc
    #printf( "      readRegexp1: [%s]\n", ch )
    if !ch # eof?
      break
    end
    if ch.chr == "\\"    #escape
      ch2 = @chReader.getc
      #printf( "      readRegexp2: [%s]\n", ch2 )
      ret += "\\" + ch2.chr
    elsif ch.chr == '/'
      break
    else
      ret += ch.chr
    end
  end
  ret
end

#readstring ⇒ Object 



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
 
# File 'lib/nendo/ruby/reader.rb', line 170

def readstring()
  ret = ""
  while true
    ch = @chReader.getc
    #printf( "      readstring: [%s]\n", ch )
    if !ch # eof?
      break
    end
    if ch.chr == "\\"
      ch2 = @chReader.getc
      ret += case ch2.chr
             when '"'    #  \"  reduce to "
               '"'
             when '\\'   #  \\  reduce to                 "\\"
             when 'n'
               "\n"
             when 'r'
               "\r"
             when 't'
               "\t"
             else
               ""
             end
    elsif ch.chr != '"'
      ret += ch.chr
    else
      @chReader.ungetc( ch )
      break
    end
  end
  ret
end

#readwhile(exp, oneshot = false) ⇒ Object 



137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
 
# File 'lib/nendo/ruby/reader.rb', line 137

def readwhile( exp, oneshot = false )
  ret = ""
  while true
    ch = @chReader.getc
    #printf( "      readwhile: [%02x]\n", ch ) if @debug
    if !ch # eof?
      break
    end
    if ch.chr.match( exp )
      ret += ch.chr
    else
      @chReader.ungetc( ch )
      break
    end
    if oneshot then   break   end
  end
  ret
end

#reset ⇒ Object 



112
113
114
 
# File 'lib/nendo/ruby/reader.rb', line 112

def reset
  @chReader.reset  if @chReader
end

#sexp ⇒ Object

sexp := ( list ) | | #( vector ) | ‘sexp | `sexp | atom



520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
 
# File 'lib/nendo/ruby/reader.rb', line 520

def sexp
  printf( "  NonT: [%s]\n", "sexp" ) if @debug
  case curtoken.kind
  when T_LINEFEED
    token
    sexp()
  when T_EOF
    begin
      raise RuntimeError, "Error: unbalanced paren(2)"
    rescue => e
      e.set_backtrace( [sprintf( "%s:%d", curtoken.sourcefile, curtoken.lineno )] + e.backtrace )
      raise e
    end
  when T_LPAREN
    skipEnter
    token # consume '('
    ret = list()
    skipEnter
    token # consume ')'
    ret
  when T_RPAREN
    token # consume ')'
    begin
      raise RuntimeError, "Error: unbalanced vector's paren(3)"
    rescue => e
      e.set_backtrace( [sprintf( "%s:%d", curtoken.sourcefile, curtoken.lineno )] + e.backtrace )
      raise e
    end
  when T_LVECTOR
    skipEnter
    token # consume '#('
    ret = vector()
    skipEnter
    token # consume ')'
    ret
  when T_QUOTE , T_QUASIQUOTE , T_UNQUOTE , T_UNQUOTE_SPLICING
    _atom = atom() ## "quote" symbol
    Cell.new( _atom, Cell.new( sexp() ))
  when T_DEBUG_PRINT
    file   = curtoken.sourcefile
    lineno = curtoken.lineno
    _atom = atom() ## "debug-print" symbol
    child = sexp()
    [_atom, child, LispString.new( file ), lineno, Cell.new( :quote, Cell.new( child )) ].to_list
  else
    atom()
  end
end

#skipEnter ⇒ Object 



513
514
515
516
517
 
# File 'lib/nendo/ruby/reader.rb', line 513

def skipEnter
  while T_LINEFEED == curtoken.kind
    token
  end
end

#skipspace ⇒ Object 



128
129
130
131
132
133
134
135
 
# File 'lib/nendo/ruby/reader.rb', line 128

def skipspace
  begin
    ch = @chReader.getc
    break if nil == ch # non eof?
    #printf( "      skipspace: [%02x]\n", ch ) if @debug
  end while ch.chr.match( /[ \t]/ )
  @chReader.ungetc( ch ) if nil != ch
end

#sourcefile ⇒ Object 



116
117
118
 
# File 'lib/nendo/ruby/reader.rb', line 116

def sourcefile
  @sourcefile
end

#token ⇒ Object 



356
357
358
359
360
361
 
# File 'lib/nendo/ruby/reader.rb', line 356

def token
  begin
    tokenWithComment
  end while T_COMMENT == curtoken.kind
  curtoken
end

#tokenWithComment ⇒ Object 



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
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
 
# File 'lib/nendo/ruby/reader.rb', line 225

def tokenWithComment
  skipspace
  ch = @chReader.getc
  if nil == ch # eof?
    @curtoken = Token.new( T_EOF, "", @chReader.sourcefile, @chReader.lineno, @chReader.column )
  else
    str = ch.chr
    kind =
      case str
      when /[\']/
        T_QUOTE
      when /[\`]/
        T_QUASIQUOTE
      when /[,]/
        str += readwhile( /[@]/, true )
        if 1 == str.length
          T_UNQUOTE
        else
          T_UNQUOTE_SPLICING
        end
      when '(', '['
        T_LPAREN
      when ')', ']'
        T_RPAREN
      when '.'
        str += readwhile( /[_a-zA-Z0-9!?.]/ )
        if 1 == str.length
          T_DOT
        else
          T_SYMBOL
        end
      when /[\r\n]/
        T_LINEFEED
      when /;/
        readwhile( /[^\r\n]/ )
        str = ""
        T_COMMENT
      when /[#]/
        nextch = peekchar( /[?!tfbodx(\/]/ )
        case nextch
        when "?"
          if peekchar( /[=]/ )
            str = ""
            T_DEBUG_PRINT
          elsif peekchar( /[.]/ )
            str = ""
            T_MACRO_DEBUG_PRINT
          else
            str += readwhile( /[^ \t\r\n]/ )
            raise NameError, sprintf( "Error: unknown #xxxx syntax for Nendo %s", str )
          end
        when "!"
          readwhile( /[^\r\n]/ )
          str = ""
          T_COMMENT
        when "("
          str = ""
          T_LVECTOR
        when "t"
          str = "true"
          T_SYMBOL
        when "f"
          str = "false"
          T_SYMBOL
        when "b","o","d","x"
          str = readwhile( /[0-9a-zA-Z]/ )
          case nextch
          when "b"
            if str.match( /^[0-1]+$/ )
              str = "0b" + str
            else
              raise RuntimeError, sprintf( "Error: illegal #b number for Nendo #b%s", str )
            end
          when "o"
            if str.match( /^[0-7]+$/ )
              str = "0o" + str
            else
              raise RuntimeError, sprintf( "Error: illegal #o number for Nendo #o%s", str )
            end
          when "d"
            if str.match( /^[0-9]+$/ )
              str = "0d" + str
            else
              raise RuntimeError, sprintf( "Error: illegal #d number for Nendo #d%s", str )
            end
          when "x"
            if str.match( /^[0-9a-fA-F]+$/ )
              str = "0x" + str
            else
              raise RuntimeError, sprintf( "Error: illegal #x number for Nendo #x%s", str )
            end
          end
          str = Integer( str ).to_s
          T_NUM
        when "/"  # T_REGEXP's str takes  "iXXXXX"(igreno case)  or  " XXXXXX"(case sensitive)  value.
          readwhile( /[\/]/ ) # consume
          str =  readRegexp()
          str =  ((0 < readwhile( /[i]/ ).size) ? "i" : " ") + str
          T_REGEXP
        else
          str += readwhile( /[^ \t\r\n]/ )
          raise NameError, sprintf( "Error: unknown #xxxx syntax for Nendo %s", str )
        end
      when /[_a-zA-Z!$%&*+\/:<=>?@^~-]/      # symbol
        str += readwhile( /[0-9._a-zA-Z!$%&*+\/:<=>?@^~-]/ )
        if str.match( /^[=][>]$/ )
          T_FEEDTO
        elsif str.match( /^[+-][0-9.]+$/ )
          T_NUM
        elsif str.match( /^[:]/ )
          str = str[1..-1]
          T_KEYWORD
        else
          T_SYMBOL
        end
      when /[0-9]/           # Numeric
        str += readwhile( /[0-9.]/ )
        T_NUM
      when /["]/             # String
        str =  LispString.new( readstring() )
        readwhile( /["]/ )
        T_STRING
      else
        str += readwhile( /[^ \t\r\n]/ )
        raise NameError, sprintf( "Error: unknown token for Nendo [%s]", str )
      end
    printf( "    token: [%s] : %s   (%s:L%d:C%d)\n", str, kind.to_s, @chReader.sourcefile, @chReader.lineno, @chReader.column ) if @debug
    @curtoken = Token.new( kind, str, @chReader.sourcefile, @chReader.lineno, @chReader.column )
  end
end

#vector ⇒ Object

vector := sexp

| atom ... atom



422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
 
# File 'lib/nendo/ruby/reader.rb', line 422

def vector
  printf( "  NonT: [%s]\n", "vector" ) if @debug
  arr = []
  while true
    case curtoken.kind
    when T_LINEFEED
      token # skipEnter
    when T_EOF
      begin
        raise RuntimeError, "Error: unbalanced vector's paren(4)"
      rescue => e
        e.set_backtrace( [sprintf( "%s:%d", curtoken.sourcefile, curtoken.lineno )] + e.backtrace )
        raise e
      end
    when T_LPAREN, T_LVECTOR
      arr << sexp()
    when T_RPAREN
      break
    when T_QUOTE , T_QUASIQUOTE , T_UNQUOTE , T_UNQUOTE_SPLICING, T_DEBUG_PRINT
      arr << sexp()
    when T_DOT
      raise RuntimeError, "Error: illegal list."
    else
      arr << atom()
    end
  end
  arr
end