A compact Guide to Lex&Yacc
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Lex and yacc are tools used to generate lexical analyzers and parsers. I assume you can program in C and understand data structures such as linked-lists and trees.
The Overview describes the basic building blocks of a compiler and explains the interaction between lex and yacc. The next two sections describe lex and yacc in more detail. With this background we can construct a sophisticated calculator. Conventional arithmetic operations and control statements, such as if-else and while , are implemented.
With minor changes we will convert the calculator into a compiler for a stack-based machine. The remaining sections discuss issues that commonly arise in compiler writing. Very compact implementation. It provides a packrat parser generator that generates parsers for Parsing Expression Grammars that operate on arbitrary streams of objects. In addition to the parser generator itself, JavaCC provides other standard capabilities related to parser generation such as tree building via a tool called JJTree included with JavaCC , actions, and debugging.
Documentation in German. Parsers and lexers will be able to use C actions. The open source. NET project Mono has requested the port, and here it is.
Directory of Lexer and Parser Generators Resources
Base at port to Turbo Pascal. Compiles under Unix using GCC 4.
The grammar may be ambiguous or more general than ELL 1 : there are both static and dynamic facilities to resolve the ambiguities. It was developed by T.
Specification scripts are in very extended BNF with inherited and synthetic attributes allowed. Converter for yacc scripts is available as well as documentation and related papers.
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The GPL'ed software can be used to create a parser for any language that is regular. Examples include parsing Unix mailbox files and general lexing tasks. A re2c generated scanner is usually times faster than a flex based scanner, and its input model is much more flexible.
Scannerless means that no scanner is used to tokenize the input stream; the parse table contains enough information for both the lexical and the context-free syntax. It is inspired by Spirit but uses only a few template classes thus allowing more flexibility and fastest compilation time. It has features like automatic derivation of depth grammar, production of the abstract syntax tree including its C interface and preserves full source information to facilitate source-source translation.