Adds raw strings

lexer.go

@@ -38,9 +38,9 @@ func eatWhiteSpace(r *strings.Reader) {
 	}
 }
 
-func eatString(r *strings.Reader) string {
+func eatString(r *strings.Reader, delim rune) string {
 	var buf strings.Builder
-	buf.WriteRune('"')
+	buf.WriteRune(delim)
 	escapeCount := 0
 	for r.Len() > 0 {
 		c, _, err := r.ReadRune()
@@ -48,9 +48,10 @@ func eatString(r *strings.Reader) string {
 			panic("Lexing error while eating string")
 		}
 		buf.WriteRune(c)
-		if c == '"' && (escapeCount == 0 || escapeCount%2 == 0) {
+		if c == delim && (escapeCount == 0 || escapeCount%2 == 0) {
 			break
-		} else if c == '\n' || (c != '"' && r.Len() == 0) {
+		} else if c == '\n' || (c != delim && r.Len() == 0) {
+			fmt.Println(delim, c, r.Len())
 			panic(fmt.Sprintf("Parse error: Unclosed string on line %d ", lexLine))
 		}
 		if c == '\\' {
@@ -136,8 +137,8 @@ Loop:
 		case '\'':
 			t := eatQuote(r)
 			tokens = append(tokens, t...)
-		case '"':
-			currentString = eatString(r)
+		case '"', '`':
+			currentString = eatString(r, c)
 			tokens = append(tokens, currentString)
 			if !list {
 				break Loop
@@ -225,9 +226,9 @@ TokenizationLoop:
 		case '\'':
 			t := eatQuote(reader)
 			tokens = append(tokens, t...)
-		case '"':
-			currentString = eatString(reader)
-			tokens = append(tokens, unescapeString(currentString))
+		case '"', '`':
+			currentString = eatString(reader, c)
+			tokens = append(tokens, currentString)
 		case ';':
 			eatSingleLineComment(reader)
 		case '#':

parser.go

@@ -101,6 +101,8 @@ func parserRead(tokens *[]string) expression {
 		}
 
 		if strings.HasPrefix(token, "\"") && strings.HasSuffix(token, "\"") {
+			return unescapeString(token[1 : len(token)-1])
+		} else if strings.HasPrefix(token, "`") && strings.HasSuffix(token, "`") {
 			return token[1 : len(token)-1]
 		} else if token == "#t" {
 			return true