October 1992
Intermediate to advanced
384 pages
7h 8m
English
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Appendix G. Abraxas lex and yacc
Abraxas Software offers pcyacc, which contains pcyacc and pclex, MS-DOS and OS/2 versions of yacc and lex. It is available from:
Abraxas Software 7033 SW Macadam Avenue Portland OR 97219 Phone: +1 503 244 5253
Pclex is based on flex, so much of what we have said about flex also applies to pclex.
Differences
The output files have different names: lex_yy.c, yytab.c, yytab.h, and yy.lrt. rather than lex.yy.c, y.tab.c, y.tab.h, and y.output.
The standard lex input buffer is only 256 characters. You can enlarge it by redefining some macros. See "yytext" in Chapter 6.
New Features
An option lets you just check the syntax of a yacc specification rather than waiting for it to generate a complete parser.
Each time it reduces a rule, a parser can write a line with the symbols in that rule into a file. (Abraxas refers to this as the parse tree option.)
An optional extended error recovery library allows more complete error reporting and recovery.
The package includes sample scanners and parsers for ANSI and K&R C, C++, Cobol, dBase III and IV, Fortran, Hypertalk, Modula-2, Pascal, pic (a demo language unrelated to troff), Postscript, Prolog, Smalltalk, SQL, and yacc and lex themselves.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.