Donald Knuth. “Literate Programming ()” in Literate Programming. CSLI, , pg. I believe that the time is ripe for significantly better documentation of . Literate programming: Knuth is doing it wrong. Literate programming advocates this: Order your code for others to read, not for the compiler. Literate. What is Literate programming? Literate programming is a style of programming invented by Donald Knuth, where the main idea is that a program’s .
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This differs from traditional documentation, in which a programmer is presented with source code that follows a compiler-imposed order, and must decipher the thought process behind the program from the code and its associated comments. Literate programming is a programming paradigm introduced by Donald Knuth in which a program is given as an explanation of the program logic in a natural language, such as English, interspersed with snippets of macros and traditional source code, from which a compilable lrogramming code can be generated.
Production of a book quality program listing. Literate programming increases product quality by requiring software developers to examine and explain their code. This neologism is from Greek “holos”, i. Besides providing a documentation tool, CWEB enhances the C language by providing the ability to knutg pieces of the program text, so that proggramming large system can be understood entirely in terms of small sections and their local interrelationships.
Knuth also claims that Literate Programming can lead to easy porting of software to multiple environments, and even cites the implementation of TeX as an example. Modules have three parts: Organize large source code files using an outlining editor Leo. Retrieved January 4, Applicability of the concept to programming on a large scale, that of commercial-grade programs, is proven by an edition of TeX code as a literate program.
He proposed a way of taking a complicated program and breaking it into small parts. This book presents a selection of modern rendering algorithms through the documented source code for a complete rendering system. The system, pbrt, is written using a programming methodology called literate programming that mixes prose describing the system with source code that implements it.
By combining the two, we can develop a style of programming that maximizes our ability to perceive the structure of a complex piece of software, and at programmung same time the documented programs can be mechanically translated into a working software system that matches the documentation. I discovered from reading some of the articles, you know, I could find three bugs in a program that was proved correct.
Anything that is logically part of the section should be moved into it, thereby reducing the complexity of the code where it is referenced. The same example was later rewritten for the noweb literate programming tool. Literate programming encourages meaningful documentation and the inclusion of details that are usually omitted in source code such as the description of algorithms, design decisions, and implementation strategy.
This book is a long literate program. We look at each character and change state if it begins or ends a word. The CWEAVE program is so named because it takes a given web and intertwines the TeX and C portions contained in each section, then it knits the whole fabric into a structured document.
The programvolume B of his 5-volume Computers and Typesetting. The effect of this simple shift of emphasis can be so profound as to change one’s whole approach to programming. Organization of source code into small sections.
This page was last edited on 20 Decemberat This was a very scary thing, for a professor of computer science to show someone a large program.
Knuth also claims that literate programming provides a first-rate documentation system, which is not an add-on, but is grown naturally in the process of exposition of one’s thoughts during a program’s creation.
Literate programs utilize sections which enable the developer to describe blocks of code in a convenient manner.
I was teaching classes and I was aware that people were using structured programming, but I hadn’t written a large computer program since The literate programming paradigmas conceived by Knuth, represents a move away from writing programs in the manner and order imposed by the computer, and instead enables programmers to develop programs in the order onuth by the logic and flow of their thoughts.
My original idea was that WEB would be merely a tool for documentation, but I actually found that my WEB programs were better than the programs I had been writing in other languages.
Literate programming Lietrate introductions in Utilize pre-conditions and post-conditions using assertions. Then in orwhen I was writing TeX82, I was able to use his experience and all the feedback he had from users, and I made the system that became WEB. Functions are decomposed into several sections.
Drawing and Literate Programming. Dobbs Journal, Marchpg. Choose class names, function names, and variable names wisely. The practitioner of literate programming can be regarded as an essayist, whose main concern is with exposition and excellence of style.
There are many factors involved in developing excellent software. Tomash Publishers reprint series, pg. I use the following list of requirements to imply a definition of a literate program and the minimum set of tools which are needed to prepare, use, and study the resulting code.
This particular trick makes it possible to Under the literate programming paradigm, the central activity of programming becomes that of conveying meaning to other intelligent beings rather than merely convincing the computer to behave in a particular way. Of course, other computer scientists have made contributions to the field that are every bit as substantial most notably Edsger Dijkstra, Charles Hoare and Niklaus Wirth.
No longer does the English commentary injected into a program have to be hidden in comment delimiters at the top of the file, or under procedure headings, or at the end of lines. The holon integrates with other holons in the hierarchy according to a flexible strategy.
A preprocessor is used to substitute arbitrary hierarchies, or rather “interconnected ‘webs’ of macros”,  to produce the compilable source code with one command “tangle”and documentation with another “weave”. It is the difference between performing and exposing a magic trick. However, I promise to reply in due time.
The system should be presented in an order based upon literafe considerations rather than syntactic constraints. The documentation portion is often a verbal description of the algorithm. Re-think or refactor code which is difficult to understand.
Literate programming: Knuth is doing it wrong
I had a discussion with him in approximately ; I’m trying to remember the exact time, maybeyes,perhaps when I visited Newcastle? The literate program should have logical subdivisions. Second, the liyerate provides a mechanism for presenting program code to the reader in an entirely different order than it is supplied to the compiler.