Flex & Bison: Text Processing Tools by John Levine

By John Levine

If you would like to parse or method textual content information in Linux or Unix, this beneficial publication explains how you can use flex and bison to unravel your difficulties fast. flex & bison is the long-awaited sequel to the vintage O'Reilly ebook, lex & yacc. within the approximately twenty years because the unique e-book used to be released, the flex and bison utilities have confirmed to be extra trustworthy and extra robust than the unique Unix tools.

flex & bison covers an identical middle performance important to Linux and Unix software improvement, in addition to a number of vital new issues. You'll locate revised tutorials for newcomers and references for complex clients, in addition to a proof of every utility's simple utilization and straightforward, standalone purposes you could create with them. With flex & bison, you'll realize the wide variety of makes use of those versatile instruments offer.

* deal with syntax crunching that common expressions instruments can't deal with
* construct compilers and interpreters, and deal with a variety of textual content processing capabilities
* Interpret code, configuration documents, or the other established layout
* research key programming ideas, together with summary syntax timber and image tables
* enforce a whole SQL grammar-with entire pattern code
* Use new beneficial properties akin to natural (reentrant) lexers and parsers, strong GLR parsers, and interfaces to C++

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Example 2-4. Concordance generator /* fb2-4 text concordance */ %option noyywrap nodefault yylineno case-insensitive /* the symbol table */ %{ struct symbol { char *name; struct ref *reflist; }; /* a word */ struct ref { struct ref *next; char *filename; int flags; int lineno; }; /* simple symtab of fixed size */ #define NHASH 9997 struct symbol symtab[NHASH]; struct symbol *lookup(char*); void addref(int, char*, char*,int); char *curfilename; /* name of current input file */ %} %% The %option line has two options we haven’t seen before, both of which are quite useful.

0. r) {fputs("out of space\n", stderr); abort(); } r->next = sp->reflist; r->filename = filename; r->lineno = lineno; r->flags = flags; sp->reflist = r; Next is addref, the routine called from inside the scanner to add a reference to a particular word; it’s implemented as a linked list of reference structures chained from the symbol. In order to make the report a little shorter, it doesn’t add a reference if the symbol already has a reference to the same line number and filename. Note that in this routine, we don’t make a copy of the filename, because we know that the caller handed us a string that won’t change.

Yyin = fopen(argv[1], "r"))) { perror(argv[1]); return (1); } } } yylex(); printf("%8d%8d%8d\n", lines, words, chars); The only differences from Example 1-1 are in the code in the third section. The main routine opens a filename passed on the command line, if the user specified one, and assigns the FILE to yyin. Otherwise, yyin is left unset, in which case yylex automatically sets it to stdin. File I/O in Flex Scanners | 23 The Flex Library Lex and flex have always come with a small library now known as -lfl that defines a default main routine, as well as a default version of yywrap, a wart left over from the earliest days of lex.

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