Add the Invalid and Unknown constants

2 files changed, 11 insertions, 6 deletions

diff --git a/cmd/mfmt/main.go b/cmd/mfmt/main.go
index 5c189ea..2c9b239 100644
--- a/cmd/mfmt/main.go
+++ b/cmd/mfmt/main.go
@@ -133,9 +133,9 @@ func formatSection(out io.Writer, rows []mintages.Row) {
 }
 
 func formatInt(n int) string {
-	if n < -1 {
-		panic("mintage count is negative and not -1")
-	} else if n == -1 {
+	if n <= mintages.Invalid {
+		panic(fmt.Sprintf("invalid input %d", n))
+	} else if n == mintages.Unknown {
 		return "?"
 	}
 
@@ -158,9 +158,9 @@ func formatInt(n int) string {
 
 func intlen(v int) int {
 	switch {
-	case v < -1:
+	case v <= mintages.Invalid:
 		panic("mintage count is negative and not -1")
-	case v == 0, v == -1:
+	case v == 0, v == mintages.Unknown:
 		return 1
 	default:
 		n := 0
diff --git a/mintages/parser.go b/mintages/parser.go
index e5a3efc..7b782b3 100644
--- a/mintages/parser.go
+++ b/mintages/parser.go
@@ -9,6 +9,11 @@ import (
 	"unicode"
 )
 
+const (
+	Unknown = -1 // Unknown mintage
+	Invalid = -2 // All mintages <= than this are invalid
+)
+
 type SyntaxError struct {
 	expected, got string
 	file          string
@@ -148,7 +153,7 @@ func Parse(reader io.Reader, file string) (Data, error) {
 
 			for i, tok := range tokens {
 				if tok == "?" {
-					row.Cols[i] = -1
+					row.Cols[i] = Unknown
 				} else {
 					row.Cols[i] = atoiWithDots(tok)
 				}