Merge pull request #421 from andreiavrammsd/notblank

Add NotBlank validation function.

doc.go

@@ -998,5 +998,30 @@ that should not make it to production.
 	}
 
 	validate.Struct(t) // this will panic
+
+Non standard validators
+
+A collection of validation rules that are frequently needed but are more
+complex than the ones found in the baked in validators.
+A non standard validator must be registered manually using any tag you like.
+See below examples of registration and use.
+
+	type Test struct {
+		TestField string `validate:"yourtag"`
+	}
+
+	t := &Test{
+		TestField: "Test"
+	}
+
+	validate := validator.New()
+	validate.RegisterValidation("yourtag", validations.ValidatorName)
+
+	NotBlank
+		This validates that the value is not blank or with length zero.
+		For strings ensures they do not contain only spaces. For channels, maps, slices and arrays
+		ensures they don't have zero length. For others, a non empty value is required.
+
+		Usage: notblank
 */
 package validator

non-standard/validators/notblank.go

@@ -0,0 +1,25 @@
+package validators
+
+import (
+	"reflect"
+	"strings"
+
+	"github.com/andreiavrammsd/validator"
+)
+
+// NotBlank is the validation function for validating if the current field
+// has a value or length greater than zero, or is not a space only string.
+func NotBlank(fl validator.FieldLevel) bool {
+	field := fl.Field()
+
+	switch field.Kind() {
+	case reflect.String:
+		return len(strings.TrimSpace(field.String())) > 0
+	case reflect.Chan, reflect.Map, reflect.Slice, reflect.Array:
+		return field.Len() > 0
+	case reflect.Ptr, reflect.Interface, reflect.Func:
+		return !field.IsNil()
+	default:
+		return field.IsValid() && field.Interface() != reflect.Zero(field.Type()).Interface()
+	}
+}

non-standard/validators/notblank_test.go

@@ -0,0 +1,65 @@
+package validators
+
+import (
+	"testing"
+
+	"github.com/andreiavrammsd/validator"
+	"gopkg.in/go-playground/assert.v1"
+)
+
+type test struct {
+	String    string      `validate:"notblank"`
+	Array     []int       `validate:"notblank"`
+	Pointer   *int        `validate:"notblank"`
+	Number    int         `validate:"notblank"`
+	Interface interface{} `validate:"notblank"`
+	Func      func()      `validate:"notblank"`
+}
+
+func TestNotBlank(t *testing.T) {
+	v := validator.New()
+	err := v.RegisterValidation("notblank", NotBlank)
+	assert.Equal(t, nil, err)
+
+	// Errors
+	var x *int
+	invalid := test{
+		String:    " ",
+		Array:     []int{},
+		Pointer:   x,
+		Number:    0,
+		Interface: nil,
+		Func:      nil,
+	}
+	fieldsWithError := []string{
+		"String",
+		"Array",
+		"Pointer",
+		"Number",
+		"Interface",
+		"Func",
+	}
+
+	errors := v.Struct(invalid).(validator.ValidationErrors)
+	var fields []string
+	for _, err := range errors {
+		fields = append(fields, err.Field())
+	}
+
+	assert.Equal(t, fieldsWithError, fields)
+
+	// No errors
+	y := 1
+	x = &y
+	valid := test{
+		String:    "str",
+		Array:     []int{1},
+		Pointer:   x,
+		Number:    1,
+		Interface: "value",
+		Func:      func() {},
+	}
+
+	err = v.Struct(valid)
+	assert.Equal(t, nil, err)
+}