lex error "Compiler Design and Construction"

rdfloyd@ceaport.UUCP (Randy Floyd)
Thu, 09 Aug 90 19:05:42 GMT

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lex error "Compiler Design and Construction" rdfloyd@ceaport.UUCP (1990-08-09)
Re: lex error "Compiler Design and Construction" vern@cs.cornell.edu (1990-08-13)
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Newsgroups: comp.unix.questions,comp.compilers
From: rdfloyd@ceaport.UUCP (Randy Floyd)
Followup-To: comp.unix.questions
Keywords: C,lex,question
Organization: C Tech, Memphis, TN
Distribution: usa
Date: Thu, 09 Aug 90 19:05:42 GMT

In "Compiler Design and Construction" by: Authur B. Pyster (second edition)


On page 67 there is a small lex for part of C syntax but when I try to run
it through FLEX I get an error.


Syntax error at line 38: bad iteration values


the definition of char and line 38 follow:


char \'([^'\n]|\\[ntrbrf'\n]|\\0[0-7]{0,2})+\'


line 38:


{char} return token(CHARLIT);


now!!!


Can a kind soul please give me a rundown of the definition line
for char and tell me why I might be getting this message.


BTW: I am new to lex/yacc but learning.
thanks for any help!!


rdfloyd@ceaport
[This is a pretty gross way to define a character constant, but I don't
see anything obviously wrong with it, other than that it matches things
like '\000' ambiguously. -John]
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