使用lexer文法生成词法分析器代码

Compiler.nim
```

```
Lexer.nim
```
return_type -> "->"
赋值 -> "="
赋值语法2 -> "->"
continue_code -> "-->"
function_keyword -> "func"
array_left -> "["
array_right -> "]"
get_array_element -> "[]"
var_keyword -> "var"
编译指示 -> "{.hint.}"

```

The issue shows lexer grammar rules in a Nim file. Start by examining the existing Compiler.nim and Lexer.nim files to understand the current lexer structure. The task is to generate lexer code from these grammar rules. Look for how tokens like '->', '=', 'func', 'var', '{.hint.}' are currently handled. Implement a code generator that reads the rule format and outputs corresponding Nim lexer procedures. Test by ensuring the generated lexer correctly tokenizes sample code containing these symbols.

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