add contains, contains any, contains rune, excludes, excludes and excludesrune validation functions + tests + docuemtation

for #43

baked_in.go

@@ -5,7 +5,9 @@ import (
 	"net/url"
 	"reflect"
 	"strconv"
+	"strings"
 	"time"
+	"unicode/utf8"
 )
 
 // BakedInValidators is the default map of ValidationFunc
@@ -42,6 +44,38 @@ var BakedInValidators = map[string]Func{
 	"url":          isURL,
 	"uri":          isURI,
 	"base64":       isBase64,
+	"contains":     contains,
+	"containsany":  containsAny,
+	"containsrune": containsRune,
+	"excludes":     excludes,
+	"excludesall":  excludesAll,
+	"excludesrune": excludesRune,
+}
+
+func excludesRune(top interface{}, current interface{}, field interface{}, param string) bool {
+	return !containsRune(top, current, field, param)
+}
+
+func excludesAll(top interface{}, current interface{}, field interface{}, param string) bool {
+	return !containsAny(top, current, field, param)
+}
+
+func excludes(top interface{}, current interface{}, field interface{}, param string) bool {
+	return !contains(top, current, field, param)
+}
+
+func containsRune(top interface{}, current interface{}, field interface{}, param string) bool {
+	r, _ := utf8.DecodeRuneInString(param)
+
+	return strings.ContainsRune(field.(string), r)
+}
+
+func containsAny(top interface{}, current interface{}, field interface{}, param string) bool {
+	return strings.ContainsAny(field.(string), param)
+}
+
+func contains(top interface{}, current interface{}, field interface{}, param string) bool {
+	return strings.Contains(field.(string), param)
 }
 
 func isNeField(top interface{}, current interface{}, field interface{}, param string) bool {

doc.go

@@ -333,6 +333,30 @@ Here is a list of the current built in validators:
 		as an error, if you wish to accept an empty string as valid you can use
 		this with the omitempty tag. (Usage: base64)
 
+	contains
+		This validates that a string value contains the substring value.
+		(Usage: contains=@)
+
+	containsany
+		This validates that a string value contains any Unicode code points
+		in the substring value. (Usage: containsany=!@#?)
+
+	containsrune
+		This validates that a string value contains the supplied rune value.
+		(Usage: containsrune=@)
+
+	excludes
+		This validates that a string value does not contain the substring value.
+		(Usage: excludes=@)
+
+	excludesall
+		This validates that a string value does not contain any Unicode code
+		points in the substring value. (Usage: excludesall=!@#?)
+
+	excludesrune
+		This validates that a string value does not contain the supplied rune value.
+		(Usage: excludesrune=@)
+
 Validator notes:
 
 	regex

validator_test.go

@@ -142,6 +142,76 @@ func isEqualFunc(val interface{}, current interface{}, field interface{}, param
 	return current.(string) == field.(string)
 }
 
+func (ms *MySuite) TestExcludesRuneValidation(c *C) {
+
+	s := "a☺b☻c☹d"
+	s2 := "abcd"
+
+	err := validate.Field(s, "excludesrune=☻")
+	c.Assert(err, NotNil)
+
+	err = validate.Field(s2, "excludesrune=☻")
+	c.Assert(err, IsNil)
+}
+
+func (ms *MySuite) TestExcludesAllValidation(c *C) {
+
+	s := "abcd@!jfk"
+	s2 := "abcdefg"
+
+	err := validate.Field(s, "excludesall=@!{}[]")
+	c.Assert(err, NotNil)
+
+	err = validate.Field(s2, "excludesall=@!{}[]")
+	c.Assert(err, IsNil)
+}
+
+func (ms *MySuite) TestExcludesValidation(c *C) {
+
+	s := "abcd@!jfk"
+
+	err := validate.Field(s, "excludes=@")
+	c.Assert(err, NotNil)
+
+	err = validate.Field(s, "excludes=q")
+	c.Assert(err, IsNil)
+}
+
+func (ms *MySuite) TestContainsRuneValidation(c *C) {
+
+	s := "a☺b☻c☹d"
+	s2 := "abcd"
+
+	err := validate.Field(s, "containsrune=☻")
+	c.Assert(err, IsNil)
+
+	err = validate.Field(s2, "containsrune=☻")
+	c.Assert(err, NotNil)
+}
+
+func (ms *MySuite) TestContainsAnyValidation(c *C) {
+
+	s := "abcd@!jfk"
+	s2 := "abcdefg"
+
+	err := validate.Field(s, "containsany=@!{}[]")
+	c.Assert(err, IsNil)
+
+	err = validate.Field(s2, "containsany=@!{}[]")
+	c.Assert(err, NotNil)
+}
+
+func (ms *MySuite) TestContainsValidation(c *C) {
+
+	s := "abcd@!jfk"
+
+	err := validate.Field(s, "contains=@")
+	c.Assert(err, IsNil)
+
+	err = validate.Field(s, "contains=q")
+	c.Assert(err, NotNil)
+}
+
 func (ms *MySuite) TestIsNeFieldValidation(c *C) {
 
 	var j uint64