Find all extension methods of a type in csharp using ast-grep

- 1 minutes read - 109 words

Usually one will use simple find or more advanced regular expression based search to locate codes. How about use other options usig ast to get more accurate results and have the potential to use for codemod? In the past 2 days, I finally figured how to use ast-grep to find code.

Here I will use it to find all extension methods of an class. The rule is configured below.

rule:
  kind: identifier
  precedes:
    kind: parameter_list
  inside:
    kind: method_declaration
    all:
      - has:
          kind: parameter_list
          has:
            nthChild: 1
            kind: parameter
            all:
              - has:
                  kind: modifier
                  regex: this
              - has:
                  kind: identifier
                  field: type
                  regex: IFhirEngineBuilder

An example is at the playground

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