[bug] format tool: the index signatures in schema stmt are always formatted before attributes

[amyXia1994]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

• create main.k with content:

schema A:
    name: str
    [other: str]: str

• run kcl-fmt main.k

2. What did you expect to see? (Required)

schema A:
    [other: str]: str
    name: str

3. What did you see instead (Required)

schema A:
    name: str
    [other: str]: str

4. What is your KCL components version? (Required)

[amyXia1994]

cause:
The format tool works by printing the ast as the formatted code. And the schema stmt walker always first walk the index signature nodes, then walk the schema body node(which contains the attributes)

Since the AST is designed to not include the index signatures in the schema body, the order between the index signatures and attributes is not recorded.

@Peefy Is this the AST is designed to not include the index signatures in the schema body designed in purpose? or could somebody explain why?
cc @NeverRaR

[Peefy]

@amyXia1994 In a schema, the syntax of index signatures is not close to the syntax of schema attribute definitions, and the order is independent in the schema. We need to define index signatures in the specification as being written as early as possible because they represent the overall composition of schema attributes.

[amyXia1994]

@amyXia1994 In a schema, the syntax of index signatures is not close to the syntax of schema attribute definitions, and the order is independent in the schema. We need to define index signatures in the specification as being written as early as possible because they represent the overall composition of schema attributes.

Ok, got it, so the behavior of described in this issue is actually a feature of the code style spec. Let's add new rules to clarify this.

[amyXia1994]

tracked in kcl-lang/kcl-lang.io#183