Add godoc badge

README.md

@@ -1,3 +1,5 @@
 # goparse
 
+[![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/sashakoshka/goparse.svg)](https://pkg.go.dev/git.tebibyte.media/sashakoshka/goparse)
+
 Flexible and unopinionated parsing framework.

parser.go

@@ -8,6 +8,10 @@ type Parser struct {
 	// be set before use.
 	Lexer Lexer
 
+	// TokenNames assigns names to token kinds. This should be set before
+	// use.
+	TokenNames map[TokenKind] string
+
 	// Token is the current token the parser is operating on.
 	Token Token
 }
@@ -17,8 +21,8 @@ type Parser struct {
 func (this *Parser) Expect (allowed ...TokenKind) error {
 	if !this.Token.Is(allowed...) {
 		return Errorf (
-			this.Token.Position, "unexpected %v; expected %s",
-			this.Token, commaList(allowed...))
+			this.Token.Position, "unexpected %s; expected %s",
+			this.tokenName(this.Token.Kind), commaList(this.tokenNames(allowed...)...))
 	}
 	return nil
 }
@@ -29,8 +33,8 @@ func (this *Parser) Expect (allowed ...TokenKind) error {
 func (this *Parser) ExpectDesc (description string, allowed ...TokenKind) error {
 	if !this.Token.Is(allowed...) {
 		return Errorf (
-			this.Token.Position, "unexpected %v; expected %s",
-			this.Token, description)
+			this.Token.Position, "unexpected %s; expected %s",
+			this.tokenName(this.Token.Kind), description)
 	}
 	return nil
 }
@@ -54,8 +58,8 @@ func (this *Parser) ExpectNextDesc (description string, allowed ...TokenKind) er
 func (this *Parser) ExpectValue (kind TokenKind, allowed ...string) error {
 	if !((this.Token.Is(kind) || kind == 0) && this.Token.ValueIs(allowed...)) {
 		return Errorf (
-			this.Token.Position, "unexpected %v; expected %s",
-			this.Token, commaList(allowed))
+			this.Token.Position, "unexpected %s; expected %s",
+			this.tokenName(this.Token.Kind), commaList(allowed))
 	}
 	return nil
 }
@@ -65,8 +69,8 @@ func (this *Parser) ExpectValue (kind TokenKind, allowed ...string) error {
 func (this *Parser) ExpectValueDesc (description string, kind TokenKind, allowed ...string) error {
 	if !this.Token.Is(kind) || !this.Token.ValueIs(allowed...) {
 		return Errorf (
-			this.Token.Position, "unexpected %v; expected %s",
-			this.Token, description)
+			this.Token.Position, "unexpected %s; expected %s",
+			this.tokenName(this.Token.Kind), description)
 	}
 	return nil
 }
@@ -110,6 +114,23 @@ func (this *Parser) EOF () bool {
 	return this.Token.EOF()
 }
 
+func (this *Parser) tokenName (kind TokenKind) string {
+	if this.TokenNames != nil {
+		if name, ok := this.TokenNames[kind]; ok {
+			return name
+		}
+	}
+	return fmt.Sprintf("TokenKind(%d)", kind)
+}
+
+func (this *Parser) tokenNames (kinds ...TokenKind) []string {
+	names := make([]string, len(kinds))
+	for index, kind := range kinds {
+		names[index] = this.tokenName(kind)
+	}
+	return names
+}
+
 func commaList[ELEMENT any] (items ...ELEMENT) string {
 	list := ""