bnf grammar

Recently I have developed a compiler and interpreter. I started to have no idea about the basic concept BNF syntax because of my own access. Now I am posting it here. It is easy to understand and learn. Transfer http://blog.chinaunix.net/u/3176/showart_404211.html Definitions and usage of BNF and EBNF

Bucos paradigm and its extensionBNF augmented BNFWhat is the bacos paradigm?The BNF (abbreviated as Backus-Naur Form) paradigm is a set of symbols first introduced by John Backus and Peter Naur to describe computer language syntax.Now, almost every newProgramming LanguageThe authors of books use the bacos paradigm to define the syntax rules of programming languages.Contents of the bacos paradigm The Word ("word") in double quotes represents the cha

The Backus paradigm (Backus-naur Form) is a formal notation introduced by Backus and Naur to represent the syntax of a programming language. Specification The characters in the quotation marks represent these themselves, and the quote represents the quotation marksThe character representing the syntax of the quotation.[] The contents of the square brackets indicate the optionalThe contents of {} braces represent items that can be repeated 0 to countless times| A vertical bar indicates either lef

Reprinted from: Cardiac Note (http://493420337.iteye.com/blog/593981)--------------------------------------------------------------------------------------------------------------- --------------------------------------------------Chomsky divides the method into four types, namely, type 0, 1, 2 and type 3. The concept of these types of grammar must be mastered and is a very important test center. For these kinds of

The following content is mainly from Wikipedia. Formal ScienceIt refers to the science of abstract forms, such as logic, mathematics, computing theory, information theory, and statistics. The branch of mathematics and computer science that specializes in language syntax is calledFormal Language TheoryIt only studies the syntax of a language and does not focus on its semantics. In computer science,Formal LanguageYes: a set of finite long strings in an alphabet, and formal

Java grammar (1) -- Grammar mark and java grammar mark ========================================================== ========================================================== ============ Description: syntax tag is used to express a syntax structure Terminal symbols are shown in fixed width font in the productions of the lexicaland syntactic grammars, and throughou

-terminator definition expressions, much like ebnf, but it is limited to not use non-terminator before it is fully defined, that is, recursion or self-Nesting is not allowed. Like regular expressions,BNFThe expression ability of the paradigm is equivalent to context-independent grammar.BNFIs the abbreviation of "Backus Naur Form. John Backus and Peter Naur introduced a formal symbol for the first time to describe the syntax of a given language. The element of

First Knowledge of PHP (i) basic grammar, the first knowledge of PHP basic grammar Always ready to learn PHP, the results of a period of time there is always something, delayed for a while. Hurry up and catch up now! This series just talk about my comments on PHP, not the nature of the tutorial. In addition, I am a small white, just write essays, the Great God for a pat. I have studied C, Java, Python, and

Basic grammar knowledge points for getting started with PHP programming, basic syntax for getting started with programming First, what is PHP PHP, or "Php:hypertext preprocessor", is an open-source universal scripting language that is widely used, especially for WEB development and embedded in HTML. Its syntax takes advantage of C, Java, and Perl, and is easy to learn. The main goal of the language is to allow web developers to quickly write dynamica

1.方法与顺序无关2.枚举绑定数据类型enum{ObjectiveC,Java,Ruby,Python,Erlang};typedefNSUIntegerLanguage;3.属性不用写@synthesize4.语法简化4.1NSNumberNSNumber*value;value=@12345;value=@123.45f;value=@123.45;value=@YES;4.2NSArrayNSArray*array;array=@[];//空数组array=@[a];//一个对象的数组array=@[a,b,c];//多个对象的数组4.3NSDictionaryNSDictionary*dict;dict=@{};//空字典dict=@{k1:o1};//包含一个键值对的字典dict=@{k1:o1,k2:o2,k3:o3};//包含多个键值对的字典 注：对可变的容器，可以用：NSMutableArray*mutablePlanets=[@[@"Mercury",@"Venus",@"Earth",@"Mars",@"Jupiter",@"Saturn",@"Uranus",@"

1. Quickly create NSNumber objectsNSNumber *number1 = @20; @ + constantint a = 20;NSNumber *number2 = @ (a); @ + (variable)2. Quickly create a string object that converts the C-language string constant to OCNSString *str1 = @ "Frank";3. Quickly create Nsarry objectsNsarray *arr1 = @[@ "AA", @ "Hu", @ "Ty", @ "FD"];4. Quickly create Nsmutablearry objectsNsmutablearray *ARR2 = [@[@ "DG", @ "Ji", @ "GT", @ "FG"] mutablecopy];5. Quickly remove elements from the array according to subscriptNSString *

--------------------------------------------------------------------------------------------------------------- ----extension One (line break definition): lineterminator:the ASCII LF character, also known as "newline" the ASCII CR character, also known as "return "The ASCII CR character followed by the ASCII LF Character---------------------------------------------------------------------------------------------------------------- -----extension Two (line break filter syntax): Inputcharacter:uni

To learn English well from many aspects, grammar is an aspect, this experience will be from the large aspects of the macro talk about how to learn English grammar.Method/Step1For a beginner, you shouldn't be overly concerned with grammar at first.This is like a child walking, there is no need to master skills, need only a lot of trying, slowly have a feeling, and then the balance of ability, with age can le

Article Introduction: use Flexbox: The new and old syntax blends to achieve best browser compatibility. Flexbox is very good, definitely a mainstream of the future layout. In the past few years, the grammar has changed a lot, here is a "old" and "new" New grammar Difference tutorial (if you are not very interested in English, you can move to read the Chinese version ). However, if we mix flexbox

Expanded C0 grammar compiler Development Notes (1) symbol table, c0 Grammar Introduction This is a compilation task. 1. Expand C0 Grammar 　Grammar includes constant description and definition, variable description and definition, no return value function definition and call, Return Value Function Definition and call, C

constructordeclaratorthrows opt constructorbody description: A very long right-hand side may is continued on A second line by substantiallyindenting this second line============================================================= ====================================================== extension Five (component multi-select syntax tag): Zerotothree:one of0 1 2 3 Description: equivalent to zerotothree:0 123When the words "one of" follow the colon in a grammar