Initial commit

errors/errors.go

@@ -0,0 +1,39 @@
+
+package errors
+
+import(
+	"bytes"
+	"fmt"
+	"github.com/localhots/penny/token"
+)
+
+type ErrorSymbol interface {
+}
+
+type Error struct {
+	Err            error
+	ErrorToken     *token.Token
+	ErrorSymbols   []ErrorSymbol
+	ExpectedTokens []string
+}
+
+func (E *Error) String() string {
+	w := new(bytes.Buffer)
+	fmt.Fprintf(w, "Error")
+	if E.Err != nil {
+		fmt.Fprintf(w, " %s\n", E.Err)
+	} else {
+		fmt.Fprintf(w, "\n")
+	}
+	fmt.Fprintf(w, "Token: type=%d, lit=%s\n", E.ErrorToken.Type, E.ErrorToken.Lit)
+	fmt.Fprintf(w, "Pos: offset=%d, line=%d, column=%d\n", E.ErrorToken.Pos.Offset, E.ErrorToken.Pos.Line, E.ErrorToken.Pos.Column)
+	fmt.Fprintf(w, "Expected one of: ")
+	for _, sym := range E.ExpectedTokens {
+		fmt.Fprintf(w, "%s ", sym)
+	}
+	fmt.Fprintf(w, "ErrorSymbol:\n")
+	for _, sym := range E.ErrorSymbols {
+		fmt.Fprintf(w, "%v\n", sym)
+	}
+	return w.String()
+}