This echo application is probably a good first step in any parser's development since it allows you to confirm that your parser is correctly interpreting the source. The final result will be an application which simply echoes out the source you type in (although it will make it conform to my stylistic conventions). It is highly unlikely that you have ever used (or even heard of) Miniset, largely because I made it up last month in order to practice with flex and bison before working on isetl. This article will present a small simple language called Miniset and then present the steps I followed to develop a parser for the language. This recent work has required that I brush up on my skills with flex and bison (in the Metrowerks' CodeWarrior environment) and doing a small project with a toy language similar to isetl seemed like a good first step. My own personal experience with flex and bison began in a course in compiler design at the University of Wisconsin-Madison and I am currently working on reimplementing an interpreter for the language isetl in ANSI C++. For example, if you are transferring data over the Internet in the form of strings, you can use flex and bison to create a parser to decode the information. There are also situations where you might want to be able to analyze a sequence of tokens even if the final output is not compiled code. First, you may find that writing (or even understanding the code behind) a simple compiler may make the syntax errors coming from other compilers more understandable. That's okay, there are still a number of reasons to learn a little about flex and bison. But wait, you protest, I don't write compilers. Bison (whose name comes from YACC-Yet Another Compiler Compiler) will group the words into sentences, the sentences into paragraphs and the paragraphs into sections. It could be used to write code breaking this article into a sequence of words and punctuation. In particular, flex (short for fast lexical analyzer) will take a sequence of characters and break them apart into tokens (words). What Are Flex and Bison (And, Why Do I Need Them)įlex and bison are code-generating tools designed to aid in compiler development.
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