/usr/share/gnu-smalltalk/examples/Tokenizer.st is in gnu-smalltalk-common 3.2.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | "======================================================================
|
| Generic tokenizer superclass.
|
|
======================================================================"
"======================================================================
|
| Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 2, or (at your option) any later version.
|
| GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
| details.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
======================================================================"
FileStream fileIn: Directory kernel, '/../examples/PushBack.st'!
Stream subclass: #Tokenizer
instanceVariableNames: 'stream line'
classVariableNames: 'CR LF'
poolDictionaries: ''
category: 'Examples-Useful'!
!Tokenizer class methodsFor: 'initialization'!
initialize
CR := Character cr.
LF := Character nl
!
!Tokenizer class methodsFor: 'instance creation'!
on: aFileName
^self new init: (FileStream open: aFileName mode: 'r')
!
onStream: aStream
^self new init: aStream
! !
!Tokenizer methodsFor: 'accessing'!
isFileStream
^self stream isKindOf: FileStream
!
stream
^stream stream
! !
!Tokenizer methodsFor: 'stream compatibility'!
position
^stream position
!
close
stream close
!
nextPut: notUsed
self shouldNotImplement
!
next
| ch tok |
[ stream atEnd ifTrue: [ ^self atEndToken ].
ch := self nextChar.
tok := self tokenize: ch.
tok isNil ] whileTrue: [ ].
^tok
!
atEnd
^stream atEnd
!
close
stream close
! !
!Tokenizer methodsFor: 'parsing tokens'!
atEndToken
^nil
!
tokenize: ch
"This must answer a token. The tokens' starting char is
passed in ch"
self subclassResponsibility
! !
!Tokenizer methodsFor: 'utility methods'!
line
^line
!
peekChar
^stream peek
!
peekChar: aChar
| next |
(next := stream next) == aChar ifTrue: [ ^true ].
stream putBack: next.
^false
!
putBack: aChar
stream putBack: aChar.
! !
!Tokenizer methodsFor: 'recording'!
nextChar
| c |
c := stream next.
c == CR ifTrue: [ line := line + 1. stream peekFor: LF ].
c == LF ifTrue: [ line := line + 1 ].
^c
! !
!Tokenizer methodsFor: 'private'!
init: aStream
stream := PushBackStream on: aStream.
line := 1.
! !
Tokenizer initialize!
|