Learn how to use compilers and parser generators to remove boilerplate, build dsls, and generally do the impossible. Learn why metaprogramming is necessary and look at some of the. Parser generators such as yacc joh79 are examples of one kind of programgenerating program. Oct 17, 20 learn how to use compilers and parser generators to remove boilerplate, build dsls, and generally do the impossible.
If you create the type sqr, the constant sqr ret is set to 100. As you can see, the expression p contains a number of subexpressions. I dynamic, interpreted high level language i has a rich, accessible runtime object model i depends on metaprogramming techniques usage of an object model. Mccool, qin, and popa shader metaprogramming in section 2 we describe how our parser generates and manages a parse tree from the shader program described in the api. Template metaprogramming tmp is a metaprogramming technique in which templates are used by a compiler to generate temporary source code, which is merged by the compiler with the rest of the source code and then compiled. Thank you, john c lilly, and thank you coincidence control publishing for releasing this edition unabridged, straight from johns biocomputer to yours. With template metaprogramming, you manipulate types, not objects. John c lilly, and thank you coincidence control publishing for releasing this edition unabridged, straight from johns biocomputer to yours. While i consider myself falling rather in the camp of the aficionados, ive met a lot more people that dont have a strong interest for it, or that even find it downright disgusting, than tmp enthusiasts. A traditional program is mainly code that manipulates a data structure and produces output. Its also possible to download the project with all dependencies resolving the dependencies proved to be a bit tricky. Copyright c 20, decorators with args 47 from functools import wraps def debugprefix. The article and the visual studio project are updated and work with the latest pdfbox version 1.
This would include the brain, internal organs, and other human organ systems such as cardiovascular, digestive, endocrine, immune, integumentary, lymphatic, muscular, nervous, reproductive, respiratory, skeletal, and urinary systems. It introduces core concepts like code generation and application composition in clear, easytofollow language, and then it takes you on a deep dive. Once this is done, code generation proceeds essentially as in other shading language compilers targetting graphics accelerators register allocation, optimization, etc. An introduction to metaprogramming for scientific computing dr conrad sanderson senior research scientist version 1. Introducing juliametaprogramming wikibooks, open books for. I have evaluated how it can be used for embedding domain speci. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. But we can also arrange metafunctions into metaprograms that generate code. Metaprogramming python 3 patterns, recipes and idioms.
An example of this is an sqrt function that takes an integer i. If you just want to parse csv data, then you should use an existing csv library. That is because there will be simple too many options and we would all get lost in them. I figure despite being selfpromotional i figure it is a forum quality, if not quite meritorious of frontpage status, this post should still be relevant. Metaprogramming is usually defined as the creation of programs which generate other programs. Net is designed to help readers understand the basic concepts, advantages, and potential pitfalls of metaprogramming. Too much cleverness in programming makes designs more complicated, code more fragile, learning curves steeper, and worst of all, it makes debugging harder. To list all possible tools and libraries parser for all languages would be kind of interesting, but not that useful. This is implementing a csv parser that can be reused. This makes it possible to create a template which calculates a value at return time, a value which can then be used as a constant in the rest of the program. I have a requirement to split a large pdf document into smaller files based on the content of the file. Monkey patching is an object oriented programming technique that allows developers to. In section 2 we describe how our parser generates and manages a parse tree from the shader program described in the api. Metaprogramming is a programming technique in which computer programs have the ability to treat other programs as their data.
Starting off the list for examples of metaprogramming is monkey patching. So metaclasses create classes, and classes create instances. Typedirected metaprogramming in rust will crichton. It introduces core concepts in clear, easytofollow language and then it takes you on a deep dive into the tools and techniques youll use to implement them in your. By concentrating on one programming language we can provide an applestoapples comparison and help you choose one option for your project.
For the purposes of this task, support for metaprogramming means any way the user can effectively modify the languages syntax thats built into the language like lisp macros or thats conventionally used with the language like the c preprocessor. Sep 01, 2010 the lemon parser generator is pretty good. If you know a library that might be useful to others, please add a link to it here. The metadata thus undergoes two translation steps, and the user is always very conscious of the boundary between her metadata and the rest of her program. Net is a practical introduction to the use of metaprogramming to improve the performance and maintainability of your code. None of these methods require external preprocessors. The output of these templates include compiletime constants, data structures, and complete functions. Domain specific language integration has to provide the right balance between the expressive power of the dsl and the implementation and maintenance cost of the applied integration techniques. The c preprocessor 19, cpp, is heavily used by c programmers.
Programming and metaprogramming in the human biocomputer. Metaprogramming at first may seem to be an advanced topic, suitable only for programming language. Using clever macros, programmers can overcome some of the limitations of c by introducing new features such as iterators, or can perform some metaprogramming, or can factorize any kind of source code text. This book avoids abstract theory and instead teaches you solid practices youll find useful immediately. Normally when we write a class, the default metaclass type is automatically invoked to create that class, and we arent even aware that its happening its possible to explicitly code the metaclass creation of a class. The use of templates can be thought of as compiletime execution. Net is designed to help readers understand the basic concepts, advantages and potential pitfalls of metaprogramming.
In order to parse pdf files using ifilter interface you need the following. In some situations, however, you can gain leverage by modifying the way that classes are produced typically by performing extra actions or injecting code. Youll explore plenty of realworld examples that reinforce key concepts. Recently, however, ive faced a problem that could not be solved by the means outlined in the article. Contribute to akimboyko metaprogramming development by creating an account on github. Ill explain the basics of how compilers work, and give an overview of some. Gettextfrompageoreader, i, its next return sout end. In some cases, this allows programmers to minimize the number of lines of code to express a solution hence reducing development time.
The biocomputer has stored program properties, and self. If you are a rust metaprogramming compilerhacking fanatic like me, then the specifics will help you understand how to actually use the compilers api. In ahead, grammar g f corresponds to a single bnf file, source s f corresponds to a tuple of java files c 1 c n, and documentation d f is a tuple of html files h 1 h k. In order to explain metaprogramming, let me explain a few basic concepts first. More information about c preprocessor macro programming is. Lilly was also a pioneer of float tanks, one of the single greatest external tools for achieving effective selfmetaprogramming, and this book sheds light on the early days of this effort. Michele and david feel, in part, responsible for some excesses of cleverness in python metaclasses. An introduction to metaprogramming ryerson university. Jul 19, 2017 to list all possible tools and libraries parser for all languages would be kind of interesting, but not that useful. Metaprogramming metaprogramming is the writing of computer programs that write or manipulate other programs or themselves as.
Metaprogramming is the writing of computer programs that write or manipulate other programs or themselves as their data, or that do part of the work at compile time that would otherwise be done at runtime. It means that a program can be designed to read, generate, analyze or transform other programs, and even modify itself while running. Otherwise, you can treat this as an example of what typedirected metaprogramming could look like in a brighter future where these apis are stable. Metaprogramming in c is the art of creating new language constructs, typically using macros. The default metaclass is called type and in the vast majority of cases it does the right thing. Of course, a type cannot be modified, so it has to be right the first time. Great introduction to c metaprogramming by simon tatham can be found here. I in most languages most information about structure is lost after compilation i the object model represents this structure at runtime. Being late to the metaprogramming party, i make no claim of having invented the techniques in this article. Thats solving a completely different problem than i just want to parse csv data. Yes, its a weird name, but its a powerful and dangerous tool.
Domain specific language integration has to provide the right balance between the expressive power of the dsl and the implementation and maintenance cost of. Contribute to akimboykometaprogramming development by creating an account on github. A genvoca value nested tuples can be depicted as a directed graph. A complete mpl reference manual, in html and pdf form. Once this is done, code generation proceeds essentially as in other shading language compilers targetting graphics accelerators register allocation, optimization. Efficient algorithms for membership testing, random access, and retrieval by key. When this is the case, you can use metaclass programming to modify the way that some of. Lilly, refers to the hardware of the human anatomy. In this article, they attempt to make amends, by helping programmers eschew cleverness. The input language to yacc is a contextfree grammar in extended backusnaur form ebnf, and its output is a program which parses that grammar. The book deals with language aspects, design patterns, examples and applications seen as case studies. Three years after the initial announcement here at ltu of the yard.
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