Flex & Bison: Text Processing Tools by John Levine PDF

By John Levine

ISBN-10: 0596155972

ISBN-13: 9780596155971

If you want to parse or procedure textual content info in Linux or Unix, this beneficial ebook explains easy methods to use flex and bison to resolve your difficulties quick. flex & bison is the long-awaited sequel to the vintage O'Reilly publication, lex & yacc. within the approximately twenty years because the unique booklet 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 middle performance very important to Linux and Unix software improvement, in addition to numerous very important new themes. You'll locate revised tutorials for rookies and references for complex clients, in addition to a proof of every utility's easy utilization and straightforward, standalone purposes you could create with them. With flex & bison, you'll detect the wide variety of makes use of those versatile instruments offer.

* tackle syntax crunching that general expressions instruments can't deal with
* construct compilers and interpreters, and deal with quite a lot of textual content processing features
* Interpret code, configuration documents, or the other dependent layout
* examine key programming ideas, together with summary syntax bushes and image tables
* enforce a whole SQL grammar-with whole pattern code
* Use new good points resembling natural (reentrant) lexers and parsers, strong GLR parsers, and interfaces to C++

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Extra resources for Flex & Bison: Text Processing Tools

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Or to put it another way, the error diagnostics are left as an exercise for the reader. Start States and Nested Input Files | 31 Symbol Tables and a Concordance Generator Nearly every flex or bison program uses a symbol table to keep track of the names used in the input. We’ll start with a very simple program that makes a concordance, which is a list of the line numbers where each word in the input appears, and then we’ll modify it to read C source to make a C cross-referencer. Managing Symbol Tables Many long and dense chapters have been written in compiler texts on the topic of symbol tables, but this (I hope) is not one of them.

But in practice such scanners are usually still plenty fast. 22 | Chapter 2: Using Flex File I/O in Flex Scanners Flex scanners will read from the standard input unless you tell them otherwise. In practice, most scanners read from files. We’ll modify the word count program from Example 1-1 to read from files, like the real wc program does. The I/O options available in scanners generated by flex and its predecessor lex have undergone extensive evolution over the past 30 years, so there are several different ways to manage a scanner’s input and output.

A string literal is the same syntax, except that it’s enclosed in double quotes, has an optional prefix L to indicate a wide string, and doesn’t have to contain any characters. " "="|"*="|"/="|"%="|"+="|"-="|"<<="|">>="|"&="|"^=""|=" ","|"#"|"##" "<:"|":>"|"%>"|"%:"|"%:%:" C calls all of the operators and punctuation punctuators. For our purposes, we separately treat three that usually indicate the end of the names in a variable or function definition, and we ignore the rest. /* identifier */ ([_a-zA-Z]|{UCN})([_a-zA-Z0-9]|{UCN})* { addref(yylineno, curfilename, yytext, defining); } /* whitespace */ [ \t\n]+ 42 | Chapter 2: Using Flex /* continued line */ \\$ The C syntax of an identifier is a letter, underscore, or UCN, optionally followed by more letters, underscores, UCNs, and digits.

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Flex & Bison: Text Processing Tools by John Levine


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