This is a note of reading self-made script language for two weeks , And then stand up flag, I plan to finish it this month

day 1

1.1 machine language & assembly language

• machine language ： No need to use software to execute , No language processor is required , It can be interpreted and executed directly by hardware A long binary digit
• assembly language ： Express huge numbers through assembly language programs , Make it easy to understand , It needs to be converted into machine language by software , This kind of software is called assembler . Assembler is a basic language processor

1.2 Interpreter & compiler

• Interpreter ： Perform operations according to the algorithm in the program , Software for executing programs If the program executed is written in virtual machine language or similar machine language programming language , This kind of software can also be called virtual machine
• compiler ： A program that can convert a program written in one language into a program written in another language The behavior of a compiler converting a program is called compiling , The program before conversion is called source code or source program . If the compiler does not convert the source code directly to machine language , It is called source code converter or source code converter

1.3 Develop language processors

Stone Language To run on Java virtual machine

1.4 The structure of language processor and the framework of this book

The source code will first perform lexical analysis , Subdivide a long string into several smaller string units . The segmented string is called word . Then the processor will perform parsing processing , Turn the arrangement of words into an abstract grammar tree . after The compiler will convert the abstract syntax tree into other languages , The interpreter will perform operations while analyzing the abstract syntax tree