I finished the PA1 of CS143 today. The most difficult part is that there is no official document (edX), and the COOL language debugging is more difficult. Here is some help for students who are also planning to enter CS143:

Preparing for Speedrun

• Virtual VM Setup: If you haven't set up the environment yet, it is recommended to follow the official website. I chose the fool-like construction method, which is to use the official environment, which is the most convenient and not easy to cause problems.
• PA1.pdf (see my repository): I didn't find the document in edX, I borrowed it from someone else's repository, and it explains the requirements in detail.
• cool-manual.pdf (see my warehouse): It is also a supplementary material, very useful. Before doing it, you can read it thoroughly to understand the grammar of the COOL language. Of course, there are a few lectures in class.This example (02-01 ~ 02-03) also needs to go through.
• list.cl in the example: This is very useful, because it is used as a linked list and is implemented in the way of header insertion, which is consistent with the idea of ​​​​the stack, and can be made into a stack by changing it..

My experience

After reading the above three (manual can be used as a supplement to grammar, read it when you use it), you can start writing. Of course, it is still quite uncomfortable to write. After all, it is a new language. In fact, the biggest pit is that,The debugging of COOL is very strenuous, so many times you just vaguely know that an error has occurred near a certain line. Some of the pits I encountered are as follows:

• if then else is a whole, not without then, or else
• Cannot declare variables in code snippets

Code implementation and information:

The above information and my code implementation are all in this repository