cue/ast: add PackageName method
Getting the package name is not entirely trivial.
Change-Id: If223bddd70dc749263fa01b127524b2d098ceb3f
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/4560
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/cue/ast/ast.go b/cue/ast/ast.go
index 7d91328..9a4441e 100644
--- a/cue/ast/ast.go
+++ b/cue/ast/ast.go
@@ -824,6 +824,21 @@
comments
}
+// PackageName returns the package name associated with this file or "" if no
+// package is associated.
+func (f *File) PackageName() string {
+ for _, d := range f.Decls {
+ switch x := d.(type) {
+ case *Package:
+ return x.Name.Name
+ case *CommentGroup:
+ default:
+ return ""
+ }
+ }
+ return ""
+}
+
func (f *File) Pos() token.Pos {
if len(f.Decls) > 0 {
return f.Decls[0].Pos()
diff --git a/cue/ast/ast_test.go b/cue/ast/ast_test.go
index 4272ffe..aaa7aa6 100644
--- a/cue/ast/ast_test.go
+++ b/cue/ast/ast_test.go
@@ -12,10 +12,15 @@
// See the License for the specific language governing permissions and
// limitations under the License.
-package ast
+package ast_test
import (
"testing"
+
+ "github.com/stretchr/testify/assert"
+
+ "cuelang.org/go/cue/ast"
+ "cuelang.org/go/cue/parser"
)
func TestCommentText(t *testing.T) {
@@ -47,14 +52,47 @@
}
for i, c := range testCases {
- list := make([]*Comment, len(c.list))
+ list := make([]*ast.Comment, len(c.list))
for i, s := range c.list {
- list[i] = &Comment{Text: s}
+ list[i] = &ast.Comment{Text: s}
}
- text := (&CommentGroup{List: list}).Text()
+ text := (&ast.CommentGroup{List: list}).Text()
if text != c.text {
t.Errorf("case %d: got %q; expected %q", i, text, c.text)
}
}
}
+
+func TestPackageName(t *testing.T) {
+ testCases := []struct {
+ input string
+ pkg string
+ }{{
+ input: `
+ package foo
+ `,
+ pkg: "foo",
+ }, {
+ input: `
+ a: 2
+ `,
+ }, {
+ input: `
+ // Comment
+
+ // Package foo ...
+ package foo
+ `,
+ pkg: "foo",
+ }}
+ for _, tc := range testCases {
+ t.Run("", func(t *testing.T) {
+ f, err := parser.ParseFile("test", tc.input)
+ if err != nil {
+ t.Fatal(err)
+ }
+ assert.Equal(t, f.PackageName(), tc.pkg)
+ })
+ }
+}
