结构

source code $⟶$ Token $\stackrel{Token}{⟶}$ Parser $\stackrel{ASR}{⟶}$ Runtime $⟶$ Output

$$\text{词法分析}\{\begin{array}{c}\text{正则}\\ \text{有限状态机}\end{array}$$

举例:

 Token = {'type':'value', 'range':{'start':??,'end':??},...}