Add MinLen and MaxLen

check.go

@@ -16,15 +16,20 @@ const (
 	RuleLatitude  = "latitude"
 	RuleLongitude = "longitude"
 	RuleMax       = "max"
+	RuleMaxLen    = "maxlen"
 	RuleMin       = "min"
+	RuleMinLen    = "minlen"
 	RuleNumber    = "number"
 	RulePhone     = "phone"
 	RuleRange     = "range"
 	RuleRequired  = "required"
 )
 
 func errRuleFormat(rule string, args []string) error {
-	return fmt.Errorf("check: cannot parse rule %q", rule+":"+strings.Join(args, ":"))
+	if len(args) > 0 {
+		rule += ":" + strings.Join(args, ":")
+	}
+	return fmt.Errorf("check: cannot parse rule %q", rule)
 }
 
 // A Checker contains keys with their checking rules.
@@ -94,8 +99,12 @@ func ruleCheck(errs Errors, rule, k, v string) {
 		args := ruleParts[1:]
 		if rule == RuleMax {
 			errs.Add(k, IsMax(v, parseRuleFloat64(rule, args))...)
+		} else if rule == RuleMaxLen {
+			errs.Add(k, IsMaxLen(v, parseRuleInt(rule, args))...)
 		} else if rule == RuleMin {
 			errs.Add(k, IsMin(v, parseRuleFloat64(rule, args))...)
+		} else if rule == RuleMinLen {
+			errs.Add(k, IsMinLen(v, parseRuleInt(rule, args))...)
 		} else if rule == RuleRange {
 			min, max := parseRuleFloat64Float64(rule, args)
 			errs.Add(k, IsInRange(v, min, max)...)
@@ -128,3 +137,14 @@ func parseRuleFloat64Float64(rule string, args []string) (float64, float64) {
 	}
 	return f1, f2
 }
+
+func parseRuleInt(rule string, args []string) int {
+	if len(args) != 1 {
+		panic(errRuleFormat(rule, args))
+	}
+	i, err := strconv.Atoi(args[0])
+	if err != nil {
+		panic(errRuleFormat(rule, args))
+	}
+	return i
+}

errors.go

@@ -8,10 +8,10 @@ var (
 	ErrInvalid      = errors.New("invalid")
 	ErrMax          = errors.New("max")
 	ErrMaxFileSize  = errors.New("maxFileSize")
-	ErrMaxLength    = errors.New("maxLength")
+	ErrMaxLen       = errors.New("maxLen")
 	ErrMin          = errors.New("min")
 	ErrMinFileSize  = errors.New("minFileSize")
-	ErrMinLength    = errors.New("minLength")
+	ErrMinLen       = errors.New("minLen")
 	ErrNotAlpha     = errors.New("notAlpha")
 	ErrNotEmail     = errors.New("notEmail")
 	ErrNotFloat     = errors.New("notFloat")

funcs.go

@@ -81,7 +81,7 @@ func IsMax(v string, max float64) []error {
 // IsMaxLen check if v length is below or equals max.
 func IsMaxLen(v string, max int) []error {
 	if len(v) > max {
-		return []error{fmt.Errorf("%v:%v", ErrMaxLength, max)}
+		return []error{fmt.Errorf("%v:%v", ErrMaxLen, max)}
 	}
 	return nil
 }
@@ -101,7 +101,7 @@ func IsMin(v string, min float64) []error {
 // IsMinLen check if v length is over or equals min.
 func IsMinLen(v string, min int) []error {
 	if len(v) < min {
-		return []error{fmt.Errorf("%v:%v", ErrMinLength, min)}
+		return []error{fmt.Errorf("%v:%v", ErrMinLen, min)}
 	}
 	return nil
 }