Also I will unsparingly share my know-hows about scripting language development.Ġ0A. However, I will do my best to delivery easy-to-follow YouTube videos along with detailed documentations that are not included in the official Bison and Flex manuals. Note that English is not my mother tongue, and I learned it only through book reading such that my English pronunciation is horribly bad and hard to understand. Through this web space, I want to make a complete Bison and Flex tutorials with both easy-to-understand documentation and easy-to-follow YouTube videos. Now I come back to numerical computing and need of these tools, Bison and Flex. for I developed another kind of software that does not need scripting feature. After since 2008, I have not used Bison or Flex much. I never liked Java or any other programming language but C++.įrom 2004 until 2008, I developed a complete scripting language called Yet Another Language using Bison and Flex. I have used C++ language after since 1990, and C++ language has been my only programming language. When I first taught myself C++ language programming back in in 1990, I wished I could be able to create a programming language like C++ some day by myself. Symbols in bison have values.My first contact with Bison and Flex goes back to 2004. In expression, $$ = $1 + $3 means it sets the value of lhs (expression) to NUMBER ($1) + NUMBER ($3) white space

op  + | – S = goal T = Unlike flex, bison doesn’t care about line boundaries, so add white space for readability Symbol on lhs of first rule is start symbol, can override with %start declaration in definition section $1, $3 refer to RHS values. Scanner Source code tokens IR Parser ErrorsĤ The Big Picture Language syntax is specified with parts of speech, not words Syntax checking matches parts of speech against a grammar 1. Better to put more rules in scanner (whitespace etc). Parser Checks stream of classified words (parts of speech) for grammatical correctness Determines if code is syntactically well-formed Guides checking at deeper levels than syntax Builds an IR representation of the code Parsing is harder than scanning. Compiler Front End (from Engineering a Compiler) Scanner (Lexical Analyzer) Maps stream of characters into words Basic unit of syntax x = x + y becomes The actual words are its lexeme Its part of speech (or syntactic category) is called its token type Scanner discards white space & (often) comments Source code tokens Intermediate Representation Scanner Parser Errors Speed is an issue in scanning  use a specialized recognizerģ The Front End (from Engineering a Compiler)

How to compile bison program