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1992-01-22
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From patrick%cs.kuleuven.ac.be@princeton.edu Thu Aug 29 01:20:59 1991
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Date: Thu, 29 Aug 1991 01:21:14 PDT
From: patrick%cs.kuleuven.ac.be@princeton.edu (Patrick Weemeeuw)
Subject: Spidery Web
To: nr@princeton.edu
Message-Id: <9108290821.AA08766@medusa.cs.kuleuven.ac.be>
Status: RO
Hello,
I'm trying to develop a web system for Prolog.
One of the difficulties I had is recognizing tokens containing
backslashes. I changed master/spider.web such that it now correctly
handles tokens like:
token \\== category ....
generating the C string "\\==" but checking for a string with lenght *3*
instead of 4.
The context diff is included below.
Patrick.
--
Patrick Weemeeuw mail: Katholieke Universiteit Leuven
Tel: +32 16 200656 x 3544 Dept. of Computer Science
e-mail: patrick@cs.kuleuven.ac.be Celestijnenlaan 200 A
Fax: +32 16 205308 B-3001 Leuven (Belgium)
======================================================================
*** spider.web Wed Aug 28 19:32:01 1991
--- spider.web.orig Wed Aug 28 17:47:57 1991
***************
*** 794,800
tokenname[$2]="SP_gen_token_" tokennumber
tokennumbers[$2]=tokennumber
tokennumber--
- #<Find real length of |$2| and put it in |tokenlength[$2]|#>
## figure out how to recognize the token
temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, tokenlength[$2])
tokentest[$2]=temp
--- 794,799 -----
tokenname[$2]="SP_gen_token_" tokennumber
tokennumbers[$2]=tokennumber
tokennumber--
## figure out how to recognize the token
temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, length($2))
tokentest[$2]=temp
***************
*** 796,802
tokennumber--
#<Find real length of |$2| and put it in |tokenlength[$2]|#>
## figure out how to recognize the token
! temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, tokenlength[$2])
tokentest[$2]=temp
# To find the length of a string considered as a C~string, we scan it looking
--- 795,801 -----
tokennumbers[$2]=tokennumber
tokennumber--
## figure out how to recognize the token
! temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, length($2))
tokentest[$2]=temp
tokenlength[$2]=length($2)
***************
*** 798,803
## figure out how to recognize the token
temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, tokenlength[$2])
tokentest[$2]=temp
# To find the length of a string considered as a C~string, we scan it looking
for occurrences of the \.{\\} character. We initialize |templ| with
--- 797,803 -----
## figure out how to recognize the token
temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, length($2))
tokentest[$2]=temp
+ tokenlength[$2]=length($2)
# The setting of attributes is as for all tokens:
***************
*** 799,827
temp = sprintf( "strncmp(\"%s\",loc-1,%d)==0", $2, tokenlength[$2])
tokentest[$2]=temp
- # To find the length of a string considered as a C~string, we scan it looking
- for occurrences of the \.{\\} character. We initialize |templ| with
- |length($2)|, and each time we find a legitimate escape sequence, we decrement
- |templ|. Remark that, given the current lexical analysis, \.{\\f}, \.{\\n} etc.
- cannot occur in a token.
- #<Find real length of |$2| and put it in |tokenlength[$2]|#>=
- templ=length($2)
- i=1 #/
- while(i<=length($2)) { #/
- if(substr($2,i,1)=="\\") { #/
- if(i<length($2)) {
- tempc=substr($2,i+1,1) #/
- if((tempc=="a") || (tempc=="b") || (tempc=="\\") || (tempc=="?") || (tempc=="'")) {
- templ--
- i++
- } else { #/
- i++ #/
- } #/
- } #/
- } #/
- i++ #/
- } #/
- tokenlength[$2]=templ
# The setting of attributes is as for all tokens:
#<Set attributes of token |$2|#>=
--- 799,804 -----
tokentest[$2]=temp
tokenlength[$2]=length($2)
# The setting of attributes is as for all tokens:
#<Set attributes of token |$2|#>=