(flex.info.gz) Can I build nested parsers that work with the same input file?

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(flex.info.gz) How can I have multiple input sources feed into the same scanner at the same time?

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(flex.info.gz) How can I match text only at the end of a file?

 
 Can I build nested parsers that work with the same input file?
 ==============================================================
 
 This is not going to work without some additional effort.  The reason is
 that `flex' block-buffers the input it reads from `yyin'.  This means
 that the "outermost" `yylex()', when called, will automatically slurp
 up the first 8K of input available on yyin, and subsequent calls to
 other `yylex()''s won't see that input.  You might be tempted to work
 around this problem by redefining `YY_INPUT' to only return a small
 amount of text, but it turns out that that approach is quite difficult.
 Instead, the best solution is to combine all of your scanners into one
 large scanner, using a different exclusive start condition for each.
 

Info Catalog

(flex.info.gz) How can I have multiple input sources feed into the same scanner at the same time?

(flex.info.gz) FAQ

(flex.info.gz) How can I match text only at the end of a file?