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Elixir: apex: 綺麗なログを出す

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概要

map や list を人が見やすいように出力する Apex の紹介です。

巨大なコレクション型を inspect で出力すると構造の把握が難しいですが、Apex を使用するとインテントや改行を入れてくれて見やすくなります。いわゆる pretty print です。

使用例

Apex.ap 変数

例えば、inspect でこちらが出力されるようなコレクションで、

output_inspect
[kind: :SelectionSet, loc: [start: 0], selections: [[kind: :Field, loc: [start: 0], name: 'feedList', selectionSet: [kind: :SelectionSet, loc: [start: 0], selections: [[kind: :Field, loc: [start: 0], name: 'feeds', arguments: [[kind: :Argument, loc: [start: 0], name: 'count', value: [kind: :Variable, loc: [start: 0], name: 'count']]], selectionSet: [kind: :SelectionSet, loc: [start: 0], selections: [[kind: :Field, loc: [start: 0], name: 'id'], [kind: :Field, loc: [start: 0], name: 'title']]]]]]]]]

Apex ではこうなります。

output_apex
[
  [0] kind: SelectionSet
  [1] loc: [
    [0] start: 0
  ]
  [2] selections: [
    [0] [
      [0] kind: Field
      [1] loc: [
        [0] start: 0
      ]
      [2] name: [
        [0] 102
        [1] 101
        [2] 101
        [3] 100
        [4] 76
        [5] 105
        [6] 115
        [7] 116
      ]
      [3] selectionSet: [
        [0] kind: SelectionSet
        [1] loc: [
          [0] start: 0
        ]
        [2] selections: [
          [0] [
            [0] kind: Field
            [1] loc: [
              [0] start: 0
            ]
            [2] name: [
              [0] 102
              [1] 101
              [2] 101
              [3] 100
              [4] 115
            ]
            [3] arguments: [
              [0] [
                [0] kind: Argument
                [1] loc: [
                  [0] start: 0
                ]
                [2] name: [
                  [0] 99
                  [1] 111
                  [2] 117
                  [3] 110
                  [4] 116
                ]
                [3] value: [
                  [0] kind: Variable
                  [1] loc: [
                    [0] start: 0
                  ]
                  [2] name: [
                    [0] 99
                    [1] 111
                    [2] 117
                    [3] 110
                    [4] 116
                  ]
                ]
              ]
            ]
            [4] selectionSet: [
              [0] kind: SelectionSet
              [1] loc: [
                [0] start: 0
              ]
              [2] selections: [
                [0] [
                  [0] kind: Field
                  [1] loc: [
                    [0] start: 0
                  ]
                  [2] name: [
                    [0] 105
                    [1] 100
                  ]
                ]
                [1] [
                  [0] kind: Field
                  [1] loc: [
                    [0] start: 0
                  ]
                  [2] name: [
                    [0] 116
                    [1] 105
                    [2] 116
                    [3] 108
                    [4] 101
                  ]
                ]
              ]
            ]
          ]
        ]
      ]
    ]
  ]
]

文字が数字の配列になっているのは Char List だからです。文字は普通に表示されます。

最後に

Char List も insect のように出力できるようにしてプルリクとかしたいのですが、まだ力不足でさくっとはできそうもないので、時間ができたときにでもやってみようと思っています。

参考

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