The program which performs lexical analysis might be known as a tokenizer, lexer, or a scanner though the scanner is also used for the initial stage of the lexers. Commonly, a lexer is integrated with a parser and they together examine the syntax of web pages, programming languages, etc.
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The Working Mechanism of Lexical Analysis
Lexical analysis is recognized as a concept that is usually used in computer science in the same manner as it gets applied to linguistics. Commonly, lexical analysis is meant to group some stream of sounds or letters into a set of units. And they represent significant syntax. In the sphere of linguistics, lexical analysis is also known as parsing whereas, in computer science, this can be called tokenizing or parsing too.
In computer science, lexical analysis breaks streams into lexemes. Here, a token does represent the fundamental unit of implication. Tokens are threaded together in a manner where the language compiler is required to return and isolate them for implementing the ideal computing instructions.
Commonly, both computers and humans do lexical analysis though how computers do this task is different and in a highly technical manner. The method in which computers accomplish lexical analysis doesn’t become transparent to humans as it needs to be programmed into some computing system.
Why Do You Need a Lexical Analyzer?
- The modesty of the designs of a compiler – The elimination of comments and white spaces allows the syntax analyzer for effectual syntactic constructs.
- Compiler portability gets improved – The usage of lexical analyzer improves the compiler portability to a high level.
- Compiler efficiency gets augmented – Specialized buffering methods meant for reading characters do fasten the compiler method with the help of a lexical analyzer.