Add variable validation

Author: 4ops

examples/5.tf

@@ -0,0 +1,13 @@
+variable testvar {
+ type = object({
+ nouns = list(string),
+ adjectives = list(string),
+ })
+
+ description = "A word pool from mad list"
+
+ validation {
+ condition = length(var.testvar["nouns"]) >= 11
+ error_message = "at least 11 nounds are needed"
+ }
+}

grammars/tf.yaml

@@ -169,7 +169,7 @@ patterns:
  0: { name: punctuation.declaration.block.end.tf }
  patterns:
  - include: "#comments"
- - match: '\b(type|default|description)(?:\s+)?(=)(?:\s+)?'
+ - match: '\b(type|default|description|validation)(?:\s+)?(=)?(?:\s+)?'
  captures:
  1: { name: meta.keyword.$1.tf }
  2: { name: keyword.operator.assignment.tf }