encoding/encoding/jsonschema: allow type number with int enum

This change adjusts the jsonschema logic to allow a number type
to be combined with a numeric enum.

Fixes #3173.

Signed-off-by: Roger Peppe <rogpeppe@gmail.com>
Change-Id: I4e2c63a51135fa3a59ec92d401b03295dc991306
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1199214
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>

encoding/jsonschema/decode.go

@@ -243,7 +243,7 @@ const (
 var coreToCUE = []cue.Kind{
 	nullType:   cue.NullKind,
 	boolType:   cue.BoolKind,
-	numType:    cue.FloatKind,
+	numType:    cue.NumberKind, // Note: both int and float.
 	stringType: cue.StringKind,
 	arrayType:  cue.ListKind,
 	objectType: cue.StructKind,
@@ -256,16 +256,20 @@ func kindToAST(k cue.Kind) ast.Expr {
 		return ast.NewNull()
 	case cue.BoolKind:
 		return ast.NewIdent("bool")
-	case cue.FloatKind:
+	case cue.NumberKind:
 		return ast.NewIdent("number")
+	case cue.IntKind:
+		return ast.NewIdent("int")
+	case cue.FloatKind:
+		return ast.NewIdent("float")
 	case cue.StringKind:
 		return ast.NewIdent("string")
 	case cue.ListKind:
 		return ast.NewList(&ast.Ellipsis{})
 	case cue.StructKind:
 		return ast.NewStruct(&ast.Ellipsis{})
 	}
-	return nil
+	panic(fmt.Errorf("unexpected kind %v", k))
 }
 
 var coreTypeName = []string{
@@ -303,6 +307,9 @@ func (s *state) add(n cue.Value, t coreType, x ast.Expr) {
 }
 
 func (s *state) setTypeUsed(n cue.Value, t coreType) {
+	if int(t) >= len(s.types) {
+		panic(fmt.Errorf("type out of range %v/%v", int(t), len(s.types)))
+	}
 	s.types[t].setTypeUsed(n, t)
 }
 

encoding/jsonschema/testdata/numericenum.txtar

@@ -8,6 +8,5 @@
     "type": "number",
     "enum": [ 1, 2, 3]
 }
--- out/decode/err --
-constraint not allowed because type number is excluded:
-    type.json:2:5
+-- out/decode/cue --
+1 | 2 | 3