initial validation logic reworked

initial function layouts and validation completed, still need to rework
all of the baked in functions, add map and array traversal and add back original
test cases.

NOTE: a far more pragmatic validation tests will be added, but not until it has
been proven stable with at least the old tests.

validator.go

@@ -18,12 +18,14 @@ import (
 
 const (
 	utf8HexComma      = "0x2C"
+	utf8Pipe          = "0x7C"
 	tagSeparator      = ","
 	orSeparator       = "|"
 	tagKeySeparator   = "="
 	structOnlyTag     = "structonly"
 	omitempty         = "omitempty"
 	skipValidationTag = "-"
+	diveTag           = "dive"
 	fieldErrMsg       = "Key: \"%s\" Error:Field validation for \"%s\" failed on the \"%s\" tag"
 	invaldField       = "Invalid field passed to traverseField"
 )
@@ -49,11 +51,11 @@ type Config struct {
 }
 
 // Func accepts all values needed for file and cross field validation
-// top     = top level struct when validating by struct otherwise nil
-// current = current level struct when validating by struct otherwise optional comparison value
-// f       = field value for validation
-// param   = parameter used in validation i.e. gt=0 param would be 0
-type Func func(top interface{}, current interface{}, f interface{}, param string) bool
+// topStruct     = top level struct when validating by struct otherwise nil
+// currentStruct = current level struct when validating by struct otherwise optional comparison value
+// field         = field value for validation
+// param         = parameter used in validation i.e. gt=0 param would be 0
+type Func func(topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldtype reflect.Type, fieldKind reflect.Kind, param string) bool
 
 // ValidationErrors is a type of map[string]*FieldError
 // it exists to allow for multiple errors passed from this library
@@ -131,12 +133,15 @@ func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflec
 	errPrefix += typ.Name() + "."
 	numFields := current.NumField()
 
+	var fld reflect.StructField
+
 	for i := 0; i < numFields; i++ {
-		v.traverseField(topStruct, currentStruct, current.Field(i), errPrefix, errs, true, typ.Field(i).Tag.Get(v.config.TagName))
+		fld = typ.Field(i)
+		v.traverseField(topStruct, currentStruct, current.Field(i), errPrefix, errs, true, fld.Tag.Get(v.config.TagName), fld.Name)
 	}
 }
 
-func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, isStructField bool, tag string) {
+func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, errPrefix string, errs ValidationErrors, isStructField bool, tag string, name string) {
 
 	if tag == skipValidationTag {
 		return
@@ -171,8 +176,8 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 				param = vals[1]
 			}
 
-			errs[errPrefix+typ.Name()] = &FieldError{
-				Field: typ.Name(),
+			errs[errPrefix+name] = &FieldError{
+				Field: name,
 				Tag:   vals[0],
 				Param: param,
 				Value: current.Interface(),
@@ -200,6 +205,9 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 				kind = current.Kind()
 			}
 
+			// changed current, so have to get inner type again
+			typ = current.Type()
+
 			if kind != reflect.Struct {
 				goto FALLTHROUGH
 			}
@@ -229,34 +237,122 @@ func (v *Validate) traverseField(topStruct reflect.Value, currentStruct reflect.
 		}
 	}
 
-	// for _, t := range strings.Split(tag, tagSeparator) {
+	var dive bool
+	// var diveSubTag string
+
+	for _, t := range strings.Split(tag, tagSeparator) {
+
+		if t == diveTag {
+
+			dive = true
+			// diveSubTag = strings.TrimLeft(strings.SplitN(tag, diveTag, 2)[1], ",")
+			break
+		}
+
+		// no use in checking tags if it's empty and is ok to be
+		// omitempty needs to be the first tag if you wish to use it
+		if t == omitempty && !hasValue(topStruct, currentStruct, current, typ, kind, "") {
+			return
+		}
+
+		// if strings.Contains(tag, omitempty) && !hasValue(topStruct, currentStruct, current, "") {
+		// 	return
+		// }
+
+		var key string
+		var param string
+
+		// if a pipe character is needed within the param you must use the utf8Pipe representation "0x7C"
+		if strings.Index(t, orSeparator) == -1 {
+			vals := strings.SplitN(t, tagKeySeparator, 2)
+			key = vals[0]
+
+			if len(key) == 0 {
+				panic(fmt.Sprintf("Invalid validation tag on field %s", name))
+			}
+
+			if len(vals) > 1 {
+				param = strings.Replace(strings.Replace(vals[1], utf8HexComma, ",", -1), utf8Pipe, "|", -1)
+			}
+		} else {
+			key = t
+		}
+
+		if v.validateField(topStruct, currentStruct, current, typ, kind, errPrefix, errs, key, param, name) {
+			return
+		}
+	}
+
+	if dive {
+		// traverse slice or map here
+		// or panic ;)
+	}
+}
+
+// validateField validates a field based on the provided key tag and param and return true if there is an error false if all ok
+func (v *Validate) validateField(topStruct reflect.Value, currentStruct reflect.Value, current reflect.Value, currentType reflect.Type, currentKind reflect.Kind, errPrefix string, errs ValidationErrors, key string, param string, name string) bool {
+
+	// check if key is orVals, it could be!
+	orVals := strings.Split(key, orSeparator)
+
+	if len(orVals) > 1 {
+
+		var errTag string
+
+		for _, val := range orVals {
+			vals := strings.SplitN(val, tagKeySeparator, 2)
+
+			if len(vals[0]) == 0 {
+				panic(fmt.Sprintf("Invalid validation tag on field %s", name))
+			}
+
+			param := ""
+			if len(vals) > 1 {
+				param = strings.Replace(strings.Replace(vals[1], utf8HexComma, ",", -1), utf8Pipe, "|", -1)
+			}
 
-	// 			if t == diveTag {
+			// validate and keep track!
+			valFunc, ok := v.config.ValidationFuncs[vals[0]]
+			if !ok {
+				panic(fmt.Sprintf("Undefined validation function on field %s", name))
+			}
 
-	// 				cField.dive = true
-	// 				cField.diveTag = strings.TrimLeft(strings.SplitN(tag, diveTag, 2)[1], ",")
-	// 				break
-	// 			}
+			if valFunc(topStruct, currentStruct, current, currentType, currentKind, param) {
+				return false
+			}
 
-	// 			orVals := strings.Split(t, orSeparator)
-	// 			cTag := &cachedTags{isOrVal: len(orVals) > 1, keyVals: make([][]string, len(orVals))}
-	// 			cField.tags = append(cField.tags, cTag)
+			errTag += orSeparator + vals[0]
+		}
 
-	// 			for i, val := range orVals {
-	// 				vals := strings.SplitN(val, tagKeySeparator, 2)
+		errs[errPrefix+name] = &FieldError{
+			Field: name,
+			Tag:   errTag[1:],
+			Value: current.Interface(),
+			Param: param,
+			Type:  currentType,
+			Kind:  currentKind,
+		}
 
-	// 				key := strings.TrimSpace(vals[0])
+		return true
+	}
 
-	// 				if len(key) == 0 {
-	// 					panic(fmt.Sprintf("Invalid validation tag on field %s", name))
-	// 				}
+	valFunc, ok := v.config.ValidationFuncs[key]
+	if !ok {
+		panic(fmt.Sprintf("Undefined validation function on field %s", name))
+	}
 
-	// 				param := ""
-	// 				if len(vals) > 1 {
-	// 					param = strings.Replace(vals[1], utf8HexComma, ",", -1)
-	// 				}
+	if valFunc(topStruct, currentStruct, current, currentType, currentKind, param) {
+		return false
+	}
+
+	errs[errPrefix+name] = &FieldError{
+		Field: name,
+		Tag:   key,
+		Value: current.Interface(),
+		Param: param,
+		Type:  currentType,
+		Kind:  currentKind,
+	}
 
-	// 				cTag.keyVals[i] = []string{key, param}
-	// 			}
-	// 		}
+	return true
 }

validator_test.go

@@ -209,16 +209,17 @@ func TestValidation(t *testing.T) {
 	}
 
 	type Test struct {
-		// Name string `validate:"required"`
-		Inner *Inner `validate:"required"`
+		Name string   `validate:"required"`
+		Arr  []string `validate:"required"`
+		// Inner *Inner `validate:"required"`
 	}
 
-	inner := &Inner{
-		Name: "",
-	}
+	// inner := &Inner{
+	// 	Name: "",
+	// }
 
-	// tst := &Test{Name: "Dean"}
-	tst := &Test{Inner: inner}
+	tst := &Test{Name: "Dean"}
+	// tst := &Test{Inner: inner}
 
 	errs := validate.Struct(tst)