October 1992
Intermediate to advanced
384 pages
7h 8m
English
Content preview from lex & yacc, 2nd Edition
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Appendix H. POSIX lex and yacc
The IEEE POSIX P1003.2 standard will define portable standard versions of lex and yacc. In nearly all cases the standards merely codify long-standing existing practice. POSIX lex closely resembles flex, minus the more exotic features. POSIX yacc closely resembles AT&T or Berkeley yacc. The input and output filenames are identical to those in flex and AT&T yacc.
Options
The syntax of the POSIX lex command is:
| lex [options] [file . . .] |
If multiple input files are specified, they are catenated together to form one lexer specification.
The options are as follows:
- -c
Writes actions in C (obsolescent).
- -n
Suppresses the summary statistics line.
- -t
Sends source code to standard output instead of to the default file lex.yy.c.
- -v
Generates a short statistical summary of the finite state machine. This option is implied when any of the tables sizes are specified in the definitions section of the lex specification.
The syntax of the yacc command is:
| yacc [options] file |
where options are as follows:
- -bxx
Uses “xx” rather than the default "yy" as the prefix in generated filenames.
- -d
Generates header file y.tab.h that contains definitions of token names for use by lexical analyzer routine.
- -l
Does not include #line constructs in the generated code. These constructs help identify lines in the specification file in error messages.
- -pxx
Uses “xx” rather than the default "yy" as the prefix in symbols in the generated C code. This lets you use multiple parsers in one program.
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