================================================================================
Case examples
================================================================================

case value {
  "A" -> True
  _ -> False
}

case value {}

--------------------------------------------------------------------------------

(source_file
  (case
    (case_subjects
      (identifier))
    (case_clauses
      (case_clause
        (case_clause_patterns
          (case_clause_pattern
            (string
              (quoted_content))))
        (record
          (constructor_name)))
      (case_clause
        (case_clause_patterns
          (case_clause_pattern
            (discard)))
        (record
          (constructor_name)))))
  (case
    (case_subjects
      (identifier))))

================================================================================
Case examples
================================================================================

// From https://gleam.run/news/v0.31-keeping-dependencies-explicit/#quality-of-life-improvements
pub fn listed(names: List(String), person: Person) -> String {
  case names {
    [name, ..names] if name == person.name -> True
    [_, ..names] -> listed(names, person)
    [] -> False
  }
}

--------------------------------------------------------------------------------

(source_file
  (comment)
  (function
    (visibility_modifier)
    (identifier)
    (function_parameters
      (function_parameter
        (identifier)
        (type
          (type_identifier)
          (type_arguments
            (type_argument
              (type
                (type_identifier))))))
      (function_parameter
        (identifier)
        (type
          (type_identifier))))
    (type
      (type_identifier))
    (function_body
      (case
        (case_subjects
          (identifier))
        (case_clauses
          (case_clause
            (case_clause_patterns
              (case_clause_pattern
                (list_pattern
                  (identifier)
                  (list_pattern_tail
                    (identifier)))))
            (case_clause_guard
              (binary_expression
                (identifier)
                (field_access
                  (identifier)
                  (label))))
            (record
              (constructor_name)))
          (case_clause
            (case_clause_patterns
              (case_clause_pattern
                (list_pattern
                  (discard)
                  (list_pattern_tail
                    (identifier)))))
            (function_call
              (identifier)
              (arguments
                (argument
                  (identifier))
                (argument
                  (identifier)))))
          (case_clause
            (case_clause_patterns
              (case_clause_pattern
                (list_pattern)))
            (record
              (constructor_name))))))))

================================================================================
Pattern matching binaries with 'as'
================================================================================

// From https://gleam.run/news/v0.31-keeping-dependencies-explicit/#quality-of-life-improvements
case tag {
  "category " as key <> value
  | "region " as key <> value
  | "priority " as key <> value -> {
    let key = string.trim(key)
    Ok(Tag(key, value))
  }
  _ -> Error(Nil)
}

--------------------------------------------------------------------------------

(source_file
  (comment)
  (case
    (case_subjects
      (identifier))
    (case_clauses
      (case_clause
        (case_clause_patterns
          (case_clause_pattern
            (binary_expression
              (binary_expression
                (string
                  (quoted_content))
                (identifier))
              (identifier)))
          (case_clause_pattern
            (binary_expression
              (binary_expression
                (string
                  (quoted_content))
                (identifier))
              (identifier)))
          (case_clause_pattern
            (binary_expression
              (binary_expression
                (string
                  (quoted_content))
                (identifier))
              (identifier))))
        (block
          (let
            (identifier)
            (function_call
              (field_access
                (identifier)
                (label))
              (arguments
                (argument
                  (identifier)))))
          (record
            (constructor_name)
            (arguments
              (argument
                (record
                  (constructor_name)
                  (arguments
                    (argument
                      (identifier))
                    (argument
                      (identifier)))))))))
      (case_clause
        (case_clause_patterns
          (case_clause_pattern
            (discard)))
        (record
          (constructor_name)
          (arguments
            (argument
              (record
                (constructor_name)))))))))

================================================================================
Case with boolean negation in a guard
================================================================================

case var {
  1 if !other_var -> True
  _ -> False
}

--------------------------------------------------------------------------------

(source_file
  (case
    (case_subjects
      (identifier))
    (case_clauses
      (case_clause
        (case_clause_patterns
          (case_clause_pattern
            (integer)))
        (case_clause_guard
          (boolean_negation
            (identifier)))
        (record
          (constructor_name)))
      (case_clause
        (case_clause_patterns
          (case_clause_pattern
            (discard)))
        (record
          (constructor_name))))))
