| ! cue vet schema.cue data.yaml |
| |
| -- frontmatter.toml -- |
| title = "Validation" |
| description = "" |
| |
| -- text.md -- |
| Constraints specify what values are allowed. |
| To CUE they are just values like anything else, |
| but conceptually they can be explained as something in between types and |
| concrete values. |
| |
| Constraints can be used to validate values of concrete instances. |
| They can be applied to CUE data, or directly to YAML or JSON. |
| |
| But constraints can also reduce boilerplate. |
| If a constraints defines a concrete value, there is no need |
| to specify it in values to which this constraint applies. |
| |
| -- schema.cue -- |
| Language :: { |
| tag: string |
| name: =~"^\\p{Lu}" // Must start with an uppercase letter. |
| } |
| languages: [...Language] |
| |
| -- data.yaml -- |
| languages: |
| - tag: en |
| name: English |
| - tag: nl |
| name: dutch |
| - tag: no |
| name: Norwegian |
| |
| -- expect-stderr -- |
| languages.2.tag: conflicting values string and false (mismatched types string and bool): |
| ./data.yaml:6:11 |
| ./schema.cue:2:8 |
| languages.1.name: invalid value "dutch" (does not match =~"^\\p{Lu}"): |
| ./schema.cue:3:8 |
| ./data.yaml:5:12 |
