Fallback Po's missing plural translation using plural forms when available. Use western rule n==1 convention only on Locale object without Domain. Fixes #34

locale.go

@@ -200,7 +200,10 @@ func (l *Locale) GetND(dom, str, plural string, n int, vars ...interface{}) stri
 		}
 	}
 
-	// Return the same we received by default
+	// Use western default rule (plural > 1) to handle missing domain default result.
+	if n == 1 {
+		return Printf(str, vars...)
+	}
 	return Printf(plural, vars...)
 }
 
@@ -237,7 +240,10 @@ func (l *Locale) GetNDC(dom, str, plural string, n int, ctx string, vars ...inte
 		}
 	}
 
-	// Return the same we received by default
+	// Use western default rule (plural > 1) to handle missing domain default result.
+	if n == 1 {
+		return Printf(str, vars...)
+	}
 	return Printf(plural, vars...)
 }
 

locale_test.go

@@ -255,6 +255,11 @@ msgstr "More Translation"
 	}
 
 	tr = l.GetN("This is a test", "This are tests", 1)
+	if tr != "This is a test" {
+		t.Errorf("Expected 'This is a test' but got '%s'", tr)
+	}
+
+	tr = l.GetN("This is a test", "This are tests", 7)
 	if tr != "This are tests" {
 		t.Errorf("Expected 'This are tests' but got '%s'", tr)
 	}
@@ -266,8 +271,12 @@ msgstr "More Translation"
 	}
 
 	tr = l.GetN("This one has invalid syntax translations", "This are tests", 1)
+	if tr != "This one has invalid syntax translations" {
+		t.Errorf("Expected 'This one has invalid syntax translations' but got '%s'", tr)
+	}
+	tr = l.GetN("This one has invalid syntax translations", "This are tests", 2)
 	if tr != "This are tests" {
-		t.Errorf("Expected 'Plural index' but got '%s'", tr)
+		t.Errorf("Expected 'This are tests' but got '%s'", tr)
 	}
 
 	// Create Locale with full language code
@@ -292,8 +301,12 @@ msgstr "More Translation"
 	}
 
 	tr = l.GetN("This one has invalid syntax translations", "This are tests", 1)
+	if tr != "This one has invalid syntax translations" {
+		t.Errorf("Expected 'This one has invalid syntax translations' but got '%s'", tr)
+	}
+	tr = l.GetN("This one has invalid syntax translations", "This are tests", 111)
 	if tr != "This are tests" {
-		t.Errorf("Expected 'Plural index' but got '%s'", tr)
+		t.Errorf("Expected 'This are tests' but got '%s'", tr)
 	}
 
 	// Create Locale with full language code
@@ -318,8 +331,12 @@ msgstr "More Translation"
 	}
 
 	tr = l.GetN("This one has invalid syntax translations", "This are tests", 1)
+	if tr != "This one has invalid syntax translations" {
+		t.Errorf("Expected 'This one has invalid syntax translations' but got '%s'", tr)
+	}
+	tr = l.GetN("This one has invalid syntax translations", "This are tests", 21)
 	if tr != "This are tests" {
-		t.Errorf("Expected 'Plural index' but got '%s'", tr)
+		t.Errorf("Expected 'This are tests' but got '%s'", tr)
 	}
 
 	// Create Locale with full language code
@@ -344,8 +361,12 @@ msgstr "More Translation"
 	}
 
 	tr = l.GetN("This one has invalid syntax translations", "This are tests", 1)
+	if tr != "This one has invalid syntax translations" {
+		t.Errorf("Expected 'This one has invalid syntax translations' but got '%s'", tr)
+	}
+	tr = l.GetN("This one has invalid syntax translations", "This are tests", 2)
 	if tr != "This are tests" {
-		t.Errorf("Expected 'Plural index' but got '%s'", tr)
+		t.Errorf("Expected 'This are tests' but got '%s'", tr)
 	}
 
 	// Create Locale with full language code
@@ -376,8 +397,12 @@ msgstr "More Translation"
 	}
 
 	tr = l.GetN("This one has invalid syntax translations", "This are tests", 1)
+	if tr != "This one has invalid syntax translations" {
+		t.Errorf("Expected 'This one has invalid syntax translations' but got '%s'", tr)
+	}
+	tr = l.GetN("This one has invalid syntax translations", "This are tests", 14)
 	if tr != "This are tests" {
-		t.Errorf("Expected 'Plural index' but got '%s'", tr)
+		t.Errorf("Expected 'This are tests' but got '%s'", tr)
 	}
 }
 

po.go

@@ -365,7 +365,7 @@ func (po *Po) pluralForm(n int) int {
 
 	// Failure fallback
 	if po.pluralforms == nil {
-		/* Use the Germanic plural rule.  */
+		/* Use Western plural rule.  */
 		if n == 1 {
 			return 0
 		}
@@ -404,7 +404,8 @@ func (po *Po) GetN(str, plural string, n int, vars ...interface{}) string {
 		}
 	}
 
-	if n == 1 {
+	// Parse plural forms to distinguish between plural and singular
+	if po.pluralForm(n) == 0 {
 		return Printf(str, vars...)
 	}
 	return Printf(plural, vars...)
@@ -448,7 +449,8 @@ func (po *Po) GetNC(str, plural string, n int, ctx string, vars ...interface{})
 		}
 	}
 
-	if n == 1 {
+	// Parse plural forms to distinguish between plural and singular
+	if po.pluralForm(n) == 0 {
 		return Printf(str, vars...)
 	}
 	return Printf(plural, vars...)