Fixed special convertion case from decimal 'x.y()' to fraction

operator-fraction.go

@@ -29,7 +29,7 @@ func float64ToFraction(f float64) (fract *fraction, err error) {
 	var sign string
 	intPart, decPart := math.Modf(f)
 	if decPart < 0.0 {
-		sign="-"
+		sign = "-"
 		intPart = -intPart
 		decPart = -decPart
 	}
@@ -89,11 +89,14 @@ func makeGeneratingFraction(s string) (f *fraction, err error) {
 		goto exit
 	}
 	if s[0] == '-' {
-		sign=int64(-1)
+		sign = int64(-1)
 		s = s[1:]
 	} else if s[0] == '+' {
 		s = s[1:]
 	}
+	if strings.HasSuffix(s, "()") {
+		s = s[0 : len(s)-2]
+	}
 	parts = strings.SplitN(s, ".", 2)
 	if num, err = strconv.ParseInt(parts[0], 10, 64); err != nil {
 		return
@@ -106,7 +109,7 @@ func makeGeneratingFraction(s string) (f *fraction, err error) {
 			den = 1
 			dec := parts[1]
 			lsd := len(dec)
-			for i:=lsd-1; i>= 0 && dec[i]=='0'; i-- {
+			for i := lsd - 1; i >= 0 && dec[i] == '0'; i-- {
 				lsd--
 			}
 			for _, c := range dec[0:lsd] {

parser_test.go

@@ -158,6 +158,7 @@ func TestGeneralParser(t *testing.T) {
 		/* 137 */ {`builtin "os.file"`, int64(1), nil},
 		/* 138 */ {`v=10; v++; v`, int64(11), nil},
 		/* 139 */ {`1+1|2+0.5`, float64(2), nil},
+		/* 140 */ {`1.2()`, newFraction(6, 5), nil},
 	}
 
 	// t.Setenv("EXPR_PATH", ".")