October 1992
Intermediate to advanced
384 pages
7h 8m
English
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Appendix F. MKS lex and yacc
Mortice Kern Systems has a lex and yacc package that runs under MS-DOS and OS/2. It includes an excellent 450 page manual, so in this discussion concentrates on the differences between MKS and other implementations. It is available from:
Mortice Kern Systems 35 King Street North Waterloo, ON N2J2W9 Canada Phone: +1 519 884 2251 or in the U.S. (800) 265-2797 E-mail: inquiry@mks.com
Differences
Most of the differences are due to running under MS-DOS or OS/2 rather than UNIX.
The output files have different names: lex_yy.c, ytab.c, ytab.h, and y.out. rather than lex.yy.c, y.tab.c, y.tab.h, and y.output.
MKS lex has its own method for handling nested include files. See "Include Operations" in Chapter 6 for details.
MKS lex has its own method for resetting a lexer into its initial state. See "Returning Values from yylex()" in Chapter 6.
MKS lex uses the macro yygetc() to read input. You can redefine it to change the input source. See "Input from Strings" in Chapter 6.
The standard lex token buffer is only 100 characters. You can enlarge it by redefining some macros. See "yytext" in Chapter 6.
The internal yacc tables are generated differently. This makes error recovery slightly different; in general MKS yacc will perform fewer reductions than will UNIX yacc before noticing an error on a lookahead token.
New Features
MKS lex and yacc can generate scanners and parsers in C++ and Pascal as well as in C.
MKS ...
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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.