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CWLAdvent Calendar 2017

Day 14

CWL User Guide 13: JavaScript Expressions をやってみた

Last updated at Posted at 2017-12-14

CWL User Guide 13: JavaScript Expressions

Common Workflow Language User Guide: JavaScript Expressions

今回は、JavaScript で、入力パラメータを、操作(manipulate)することができるということ、について書かれています

このあたり、JavaScriptで、どのあたりまでできるのか?
JavaScript あれば解決できるなということがこのあたりに合致するかを確認してみると良いと思います。

Key Points から

  • InlineJavascriptRequirement が指定された場合、 JavaScript は、 CWL runner により解釈される
  • expression 形式が使えるフィールドは限られている。
  • expression は、他に解決策がないときのみ使われるべき

この回にでてくる主なキーワード

  • InlineJavascriptRequirement
  • valueFrom

CWLファイル、expression.cwl

expression.cwl
#!/usr/bin/env cwl-runner

cwlVersion: v1.0
class: CommandLineTool
baseCommand: echo

requirements:
  - class: InlineJavascriptRequirement

inputs: []
outputs: []
arguments:
  - prefix: -A
    valueFrom: $(1+1)
  - prefix: -B
    valueFrom: $("/foo/bar/baz".split('/').slice(-1)[0])
  - prefix: -C
    valueFrom: |
      ${
        var r = [];
        for (var i = 10; i >= 1; i--) {
          r.push(i);
        }
        return r;
      }

パラメータファイル

empty.yml
{}

実行

実行方法

cwltool expression.cwl empty.yml

実行結果

$ cwltool expression.cwl empty.yml
/usr/local/bin/cwltool 1.0.20171107133715
Resolved 'expression.cwl' to 'file:///home/vagrant/cwl_user_guide_work/13-expressions/expression.cwl'
[job expression.cwl] /tmp/tmpMRy2L5$ echo \
    -A \
    2 \
    -B \
    baz \
    -C \
    10 \
    9 \
    8 \
    7 \
    6 \
    5 \
    4 \
    3 \
    2 \
    1
-A 2 -B baz -C 10 9 8 7 6 5 4 3 2 1
[job expression.cwl] completed success
{}
Final process status is success

今回使ったファイル

cwl_user_guide_work/13-expressions at master · manabuishii/cwl_user_guide_work

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