this compiler for xml , Lexer and Parser
A lexer, parser, and XML are all related to computer programming. A lexer is a program that breaks down a stream of characters into tokens. A parser is a program that takes a stream of tokens and interprets them as instructions. XML is a markup language that is used to represent data in a structured way.
A lexer is the first step in parsing an XML document. The lexer breaks down the document into tokens, which are individual pieces of data. For example, a lexer might break down the following XML document into the following tokens:
<hello>Hello, world!</hello>hello
Hello, world!
</hello>
The parser then takes these tokens and interprets them as instructions. For example, the parser might interpret the first token, "hello", as an instruction to create a new element with the name "hello". The parser might then interpret the second token, "Hello, world!", as the content of the "hello" element.
XML is a markup language that is used to represent data in a structured way. XML documents are made up of elements, which are enclosed in tags. Elements can have attributes, which are additional pieces of information about the element. For example, the following XML document represents a person's name:
<person name="John Doe">
</person>The "person" element has one attribute, "name", which is set to the value "John Doe".
XML is a powerful tool that can be used to represent data in a structured way. XML documents can be parsed by programs to extract data or to perform other tasks.
Here are some additional details about lexers, parsers, and XML:
- Lexers: A lexer is a program that breaks down a stream of characters into tokens. A token is a single unit of data, such as a word, a number, or a punctuation mark. The lexer uses a set of rules to determine which characters belong to which tokens.
- Parsers: A parser is a program that takes a stream of tokens and interprets them as instructions. The parser uses a set of rules to determine what each token means and how the tokens should be combined to form instructions.
- XML: XML is a markup language that is used to represent data in a structured way. XML documents are made up of elements, which are enclosed in tags. Elements can have attributes, which are additional pieces of information about the element.
