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`match` transform: Document the `fallbackTo` option (#392)

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Julien Duchesne 2023-04-10 11:06:41 -04:00 committed by GitHub
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@ -889,8 +889,14 @@ patterns. It should be used if more advanced pattern matchings than a simple
string equality check are required.
The result of the first matching pattern is used as the output of this
transform.
If no pattern matches, you can either fallback to a given `fallbackValue` or
fallback to the input value by setting the `fallbackTo` field to `Input`.
```yaml
# In the example below, if the value in the 'from' field is 'us-west', the
# value in the 'to' field will be set to 'West US'.
# If the value in the 'from' field is 'eu-west', the value in the 'to' field
# will be set to 'Unknown' because no pattern matches.
- type: match
match:
patterns:
@ -900,7 +906,25 @@ transform.
- type: regexp
regexp: '^af-.*'
result: Somewhere in Africa
fallbackTo: Value # Not needed. This is the default.
fallbackValue: Unknown
# If fallbackTo is set to Input, the output will be the input value if no
# pattern matches.
# In the example below, if the value in the 'from' field is 'us-west', the
# value in the 'to' field will be set to 'West US'.
# If the value in the 'from' field is 'eu-west', the value in the 'to' field
# will be set to 'eu-west' because no pattern matches.
- type: match
match:
patterns:
- type: literal
literal: us-west
result: West US
- type: regexp
regexp: '^af-.*'
result: Somewhere in Africa
fallbackTo: Input
```
`math`. Transforms values using math. The input value must be an integer.