Squirrel language learning notes (1)

SQUIRREL is a work by a person. The author is an Italian guy, Albert to demiris. He is younger than me (as if he is less than 30 years old) and is currently developing a game in Singapore. SQUIRREL is designed to replace LUA. (If you are engaged in Game Development, You should know LUA. I am not engaged in game development, but I also know about LUA, huh, huh !), I personally think the SQUIRREL syntax is more suitable for C/C ++ programmers. Many LUA syntaxes are different from those of C/C ++. It is easy to make mistakes when writing scripts.

LUA is a niche language, and SQUIRREL is even smaller. I accidentally discovered this language and began to study it. At that time, the main purpose was to find a suitable web (server) is SQUIRREL.

 

I. Initial impressions

Squirrel is more similar to Lua like C/C ++, or C ++-Java-C #. The reserved words are basically C/C ++, the usage of control statements such as if/do/while/for is similar. This feature makes Squirrel quick to get started. I can use it if I look at it.

Squirrel is a dynamic language and weak type. You do not need to specify the type when defining variables. Squirrel is not a language for simultaneous interpretation and execution. It has a compiler and virtual machine. The code is dynamically compiled into bytecode and then executed on the virtual machine. Such compilation is much simpler than C/C ++ or Java compilation, and its virtual machine certainly does not have the "underlying" such as JVM ", squirrel's virtual machine is more like a "function execution queue", which is based on the standard libc (that is, the standard C function is a meta operation in this virtual machine ), the JVM is based on the assembly language.

Squirrel is designed to be embedded in C/C ++. Therefore, Squirrel virtual machines can work with C/C ++ in a process/thread and use virtual machine interfaces, data of C/C ++ can be accessed by embedded Squirrel Code. On the contrary, Squirrel code and data can be fully controlled by C/C ++.

It seems that squirrel is in the same line with Lua in the bones. Squirrel and Lua are based on generalized tables (or a multi-Cross Tree ), hash plays a key role in this generalized table. Squirrel code and data are organized in a generalized table. Data, functions, and classes (LUA does not support Oo, squirrel roughly supports OO) are values in a generalized table and the values are stored in the <name, value> method, you can easily find the value through the hash of the name.