wit: handle % in WIT package, world, and interface identfiers

Author: ydnar

wit/ident.go

@@ -34,6 +34,7 @@ type Ident struct {
 // returning any errors encountered. The resulting Ident
 // may not be valid.
 func ParseIdent(s string) (Ident, error) {
+	s = strings.ReplaceAll(s, "%", "")
 	var id Ident
 	name, ver, hasVer := strings.Cut(s, "@")
 	base, ext, hasExt := strings.Cut(name, "/")

wit/ident_test.go

@@ -18,6 +18,12 @@ func TestIdent(t *testing.T) {
 		{"wasi:io/streams", Ident{Namespace: "wasi", Package: "io", Extension: "streams"}, false},
 		{"wasi:io/[email protected]", Ident{Namespace: "wasi", Package: "io", Extension: "streams", Version: semver.New("0.2.0")}, false},
 
+		// Escaping
+		{"%use:%own", Ident{Namespace: "use", Package: "own"}, false},
+		{"%use:%[email protected]", Ident{Namespace: "use", Package: "own", Version: semver.New("0.2.0")}, false},
+		{"%use:%own/%type", Ident{Namespace: "use", Package: "own", Extension: "type"}, false},
+		{"%use:%own/%[email protected]", Ident{Namespace: "use", Package: "own", Extension: "type", Version: semver.New("0.2.0")}, false},
+
 		// Errors
 		{"", Ident{}, true},
 		{":", Ident{}, true},