Cleanup unused vars, move unEscape and add tests

nquads/parse.rl

@@ -17,10 +17,8 @@
 package nquads
 
 import (
-	"bytes"
 	"errors"
 	"fmt"
-	"strconv"
 	"unicode"
 
 	"github.com/google/cayley/graph"
@@ -63,59 +61,3 @@ func parse(data []rune) (graph.Triple, error) {
 
 	return graph.Triple{}, ErrInvalid
 }
-
-func unEscape(r []rune, isEscaped bool) string {
-	if !isEscaped {
-		return string(r)
-	}
-
-	buf := bytes.NewBuffer(make([]byte, 0, len(r)))
-
-	for i := 0; i < len(r); {
-		switch r[i] {
-		case '\\':
-			i++
-			var c byte
-			switch r[i] {
-			case 't':
-				c = '\t'
-			case 'b':
-				c = '\b'
-			case 'n':
-				c = '\n'
-			case 'r':
-				c = '\r'
-			case 'f':
-				c = '\f'
-			case '"':
-				c = '"'
-			case '\'':
-				c = '\''
-			case '\\':
-				c = '\\'
-			case 'u':
-				rc, err := strconv.ParseInt(string(r[i+1:i+5]), 16, 32)
-				if err != nil {
-					panic(fmt.Errorf("internal parser error: %v", err))
-				}
-				buf.WriteRune(rune(rc))
-				i += 5
-				continue
-			case 'U':
-				rc, err := strconv.ParseInt(string(r[i+1:i+9]), 16, 32)
-				if err != nil {
-					panic(fmt.Errorf("internal parser error: %v", err))
-				}
-				buf.WriteRune(rune(rc))
-				i += 9
-				continue
-			}
-			buf.WriteByte(c)
-		default:
-			buf.WriteRune(r[i])
-		}
-		i++
-	}
-
-	return buf.String()
-}