By John Levine
ISBN-10: 0596155972
ISBN-13: 9780596155971
If you want to parse or strategy textual content facts in Linux or Unix, this helpful e-book 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 publication, lex & yacc. within the approximately twenty years because the unique ebook was once released, the flex and bison utilities have confirmed to be extra trustworthy and extra strong than the unique Unix tools.
flex & bison covers an analogous center performance very important to Linux and Unix application improvement, in addition to a number of vital new subject matters. You'll locate revised tutorials for beginners and references for complex clients, in addition to an evidence of every utility's easy utilization and easy, standalone functions you could create with them. With flex & bison, you'll notice the wide variety of makes use of those versatile instruments offer.
* deal with syntax crunching that usual expressions instruments can't deal with
* construct compilers and interpreters, and deal with a variety of textual content processing features
* Interpret code, configuration documents, or the other established structure
* examine key programming strategies, together with summary syntax bushes and image tables
* enforce an entire SQL grammar-with entire pattern code
* Use new positive factors corresponding to natural (reentrant) lexers and parsers, robust GLR parsers, and interfaces to C++
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Extra info for Flex & Bison: Text Processing Tools
Example text
In the parser we define two new tokens, OP and CP for open and close parentheses, and add a rule to make a parenthesized expression a term: %token OP CP in the declaration section ... %% term: NUMBER | ABS term { $$ = $2 >= 0? $2 : - $2; } | OP exp CP { $$ = $2; } New rule ; Note the action code in the new rule assigns $2, the value of the expression in the parentheses, to $$. The scanner has two new rules to recognize the two new tokens and one new rule to ignore two slashes followed by arbitrary text.
Patterns are tagged with start state names in angle brackets to indicate in which state(s) the pattern is active. The %x marks IFILE as an exclusive start state, which means that when that state is active, only patterns specifically marked with the state can match. (There are also inclusive start states declared with %s, in which patterns not marked with any state can also match. ) In action code, the macro BEGIN switches to a different start state. Example 2-3 shows a code skeleton for a scanner that handles included files.
Note that it doesn’t call yyrestart() when it restores the prior buffer; if it did, it would lose any input that had already been read into the buffer. This is a fairly typical albeit somewhat simplistic example of code for handling include files. Although flex can handle a stack of input buffers using the routines yypush_buffer_state and yypop_buffer_state, I rarely find them to be useful since they don’t handle the other information invariably associated with the stacked files. § It returns the value YY_NULL, defined as 0, which a bison parser interprets as the end of input.
Flex & Bison: Text Processing Tools by John Levine
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