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Diffstat (limited to 'vendor/github.com/ulule/deepcopier')
| -rw-r--r-- | vendor/github.com/ulule/deepcopier/LICENSE | 22 | ||||
| -rw-r--r-- | vendor/github.com/ulule/deepcopier/README.md | 129 | ||||
| -rw-r--r-- | vendor/github.com/ulule/deepcopier/deepcopier.go | 350 |
3 files changed, 501 insertions, 0 deletions
diff --git a/vendor/github.com/ulule/deepcopier/LICENSE b/vendor/github.com/ulule/deepcopier/LICENSE new file mode 100644 index 000000000..d5c4ea02c --- /dev/null +++ b/vendor/github.com/ulule/deepcopier/LICENSE @@ -0,0 +1,22 @@ +The MIT License (MIT) + +Copyright (c) 2015 Ulule + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + diff --git a/vendor/github.com/ulule/deepcopier/README.md b/vendor/github.com/ulule/deepcopier/README.md new file mode 100644 index 000000000..25aafae8a --- /dev/null +++ b/vendor/github.com/ulule/deepcopier/README.md @@ -0,0 +1,129 @@ +# Deepcopier + +[](http://travis-ci.org/ulule/deepcopier) + +This package is meant to make copying of structs to/from others structs a bit easier. + +## Installation + +```bash +go get -u github.com/ulule/deepcopier +``` + +## Usage + +```golang +// Deep copy instance1 into instance2 +Copy(instance1).To(instance2) + +// Deep copy instance1 into instance2 and passes the following context (which +// is basically a map[string]interface{}) as first argument +// to methods of instance2 that defined the struct tag "context". +Copy(instance1).WithContext(map[string]interface{}{"foo": "bar"}).To(instance2) + +// Deep copy instance2 into instance1 +Copy(instance1).From(instance2) + +// Deep copy instance2 into instance1 and passes the following context (which +// is basically a map[string]interface{}) as first argument +// to methods of instance1 that defined the struct tag "context". +Copy(instance1).WithContext(map[string]interface{}{"foo": "bar"}).From(instance2) +``` + +Available options for `deepcopier` struct tag: + +| Option | Description | +| --------- | -------------------------------------------------------------------- | +| `field` | Field or method name in source instance | +| `skip` | Ignores the field | +| `context` | Takes a `map[string]interface{}` as first argument (for methods) | +| `force` | Set the value of a `sql.Null*` field (instead of copying the struct) | + +**Options example:** + +```golang +type Source struct { + Name string + SkipMe string + SQLNullStringToSQLNullString sql.NullString + SQLNullStringToString sql.NullString + +} + +func (Source) MethodThatTakesContext(c map[string]interface{}) string { + return "whatever" +} + +type Destination struct { + FieldWithAnotherNameInSource string `deepcopier:"field:Name"` + SkipMe string `deepcopier:"skip"` + MethodThatTakesContext string `deepcopier:"context"` + SQLNullStringToSQLNullString sql.NullString + SQLNullStringToString string `deepcopier:"force"` +} + +``` + +Example: + +```golang +package main + +import ( + "fmt" + + "github.com/ulule/deepcopier" +) + +// Model +type User struct { + // Basic string field + Name string + // Deepcopier supports https://golang.org/pkg/database/sql/driver/#Valuer + Email sql.NullString +} + +func (u *User) MethodThatTakesContext(ctx map[string]interface{}) string { + // do whatever you want + return "hello from this method" +} + +// Resource +type UserResource struct { + DisplayName string `deepcopier:"field:Name"` + SkipMe string `deepcopier:"skip"` + MethodThatTakesContext string `deepcopier:"context"` + Email string `deepcopier:"force"` + +} + +func main() { + user := &User{ + Name: "gilles", + Email: sql.NullString{ + Valid: true, + String: "gilles@example.com", + }, + } + + resource := &UserResource{} + + deepcopier.Copy(user).To(resource) + + fmt.Println(resource.DisplayName) + fmt.Println(resource.Email) +} +``` + +Looking for more information about the usage? + +We wrote [an introduction article](https://github.com/ulule/deepcopier/blob/master/examples/rest-usage/README.rst). +Have a look and feel free to give us your feedback. + +## Contributing + +* Ping us on twitter [@oibafsellig](https://twitter.com/oibafsellig), [@thoas](https://twitter.com/thoas) +* Fork the [project](https://github.com/ulule/deepcopier) +* Help us improving and fixing [issues](https://github.com/ulule/deepcopier/issues) + +Don't hesitate ;) diff --git a/vendor/github.com/ulule/deepcopier/deepcopier.go b/vendor/github.com/ulule/deepcopier/deepcopier.go new file mode 100644 index 000000000..8cccb5b78 --- /dev/null +++ b/vendor/github.com/ulule/deepcopier/deepcopier.go @@ -0,0 +1,350 @@ +package deepcopier + +import ( + "database/sql/driver" + "fmt" + "reflect" + "strings" +) + +const ( + // TagName is the deepcopier struct tag name. + TagName = "deepcopier" + // FieldOptionName is the from field option name for struct tag. + FieldOptionName = "field" + // ContextOptionName is the context option name for struct tag. + ContextOptionName = "context" + // SkipOptionName is the skip option name for struct tag. + SkipOptionName = "skip" + // ForceOptionName is the skip option name for struct tag. + ForceOptionName = "force" +) + +type ( + // TagOptions is a map that contains extracted struct tag options. + TagOptions map[string]string + + // Options are copier options. + Options struct { + // Context given to WithContext() method. + Context map[string]interface{} + // Reversed reverses struct tag checkings. + Reversed bool + } +) + +// DeepCopier deep copies a struct to/from a struct. +type DeepCopier struct { + dst interface{} + src interface{} + ctx map[string]interface{} +} + +// Copy sets source or destination. +func Copy(src interface{}) *DeepCopier { + return &DeepCopier{src: src} +} + +// WithContext injects the given context into the builder instance. +func (dc *DeepCopier) WithContext(ctx map[string]interface{}) *DeepCopier { + dc.ctx = ctx + return dc +} + +// To sets the destination. +func (dc *DeepCopier) To(dst interface{}) error { + dc.dst = dst + return process(dc.dst, dc.src, Options{Context: dc.ctx}) +} + +// From sets the given the source as destination and destination as source. +func (dc *DeepCopier) From(src interface{}) error { + dc.dst = dc.src + dc.src = src + return process(dc.dst, dc.src, Options{Context: dc.ctx, Reversed: true}) +} + +// process handles copy. +func process(dst interface{}, src interface{}, args ...Options) error { + var ( + options = Options{} + srcValue = reflect.Indirect(reflect.ValueOf(src)) + dstValue = reflect.Indirect(reflect.ValueOf(dst)) + srcFieldNames = getFieldNames(src) + srcMethodNames = getMethodNames(src) + ) + + if len(args) > 0 { + options = args[0] + } + + if !dstValue.CanAddr() { + return fmt.Errorf("destination %+v is unaddressable", dstValue.Interface()) + } + + for _, f := range srcFieldNames { + var ( + srcFieldValue = srcValue.FieldByName(f) + srcFieldType, srcFieldFound = srcValue.Type().FieldByName(f) + srcFieldName = srcFieldType.Name + dstFieldName = srcFieldName + tagOptions TagOptions + ) + + if !srcFieldFound { + continue + } + + if options.Reversed { + tagOptions = getTagOptions(srcFieldType.Tag.Get(TagName)) + if v, ok := tagOptions[FieldOptionName]; ok && v != "" { + dstFieldName = v + } + } else { + if name, opts := getRelatedField(dst, srcFieldName); name != "" { + dstFieldName, tagOptions = name, opts + } + } + + if _, ok := tagOptions[SkipOptionName]; ok { + continue + } + + var ( + dstFieldType, dstFieldFound = dstValue.Type().FieldByName(dstFieldName) + dstFieldValue = dstValue.FieldByName(dstFieldName) + ) + + if !dstFieldFound { + continue + } + + // Force option for empty interfaces and nullable types + _, force := tagOptions[ForceOptionName] + + // Valuer -> ptr + if isNullableType(srcFieldType.Type) && dstFieldValue.Kind() == reflect.Ptr && force { + v, _ := srcFieldValue.Interface().(driver.Valuer).Value() + if v == nil { + continue + } + + valueType := reflect.TypeOf(v) + + ptr := reflect.New(valueType) + ptr.Elem().Set(reflect.ValueOf(v)) + + if valueType.AssignableTo(dstFieldType.Type.Elem()) { + dstFieldValue.Set(ptr) + } + + continue + } + + // Valuer -> value + if isNullableType(srcFieldType.Type) { + if force { + v, _ := srcFieldValue.Interface().(driver.Valuer).Value() + if v == nil { + continue + } + + rv := reflect.ValueOf(v) + if rv.Type().AssignableTo(dstFieldType.Type) { + dstFieldValue.Set(rv) + } + } + + continue + } + + if dstFieldValue.Kind() == reflect.Interface { + if force { + dstFieldValue.Set(srcFieldValue) + } + continue + } + + // Ptr -> Value + if srcFieldType.Type.Kind() == reflect.Ptr && !srcFieldValue.IsNil() && dstFieldType.Type.Kind() != reflect.Ptr { + indirect := reflect.Indirect(srcFieldValue) + + if indirect.Type().AssignableTo(dstFieldType.Type) { + dstFieldValue.Set(indirect) + continue + } + } + + // Other types + if srcFieldType.Type.AssignableTo(dstFieldType.Type) { + dstFieldValue.Set(srcFieldValue) + } + } + + for _, m := range srcMethodNames { + name, opts := getRelatedField(dst, m) + if name == "" { + continue + } + + if _, ok := opts[SkipOptionName]; ok { + continue + } + + method := reflect.ValueOf(src).MethodByName(m) + if !method.IsValid() { + return fmt.Errorf("method %s is invalid", m) + } + + var ( + dstFieldType, _ = dstValue.Type().FieldByName(name) + dstFieldValue = dstValue.FieldByName(name) + _, withContext = opts[ContextOptionName] + _, force = opts[ForceOptionName] + ) + + args := []reflect.Value{} + if withContext { + args = []reflect.Value{reflect.ValueOf(options.Context)} + } + + var ( + result = method.Call(args)[0] + resultInterface = result.Interface() + resultValue = reflect.ValueOf(resultInterface) + resultType = resultValue.Type() + ) + + // Value -> Ptr + if dstFieldValue.Kind() == reflect.Ptr && force { + ptr := reflect.New(resultType) + ptr.Elem().Set(resultValue) + + if ptr.Type().AssignableTo(dstFieldType.Type) { + dstFieldValue.Set(ptr) + } + + continue + } + + // Ptr -> value + if resultValue.Kind() == reflect.Ptr && force { + if resultValue.Elem().Type().AssignableTo(dstFieldType.Type) { + dstFieldValue.Set(resultValue.Elem()) + } + + continue + } + + if resultType.AssignableTo(dstFieldType.Type) && result.IsValid() { + dstFieldValue.Set(result) + } + } + + return nil +} + +// getTagOptions parses deepcopier tag field and returns options. +func getTagOptions(value string) TagOptions { + options := TagOptions{} + + for _, opt := range strings.Split(value, ";") { + o := strings.Split(opt, ":") + + // deepcopier:"keyword; without; value;" + if len(o) == 1 { + options[o[0]] = "" + } + + // deepcopier:"key:value; anotherkey:anothervalue" + if len(o) == 2 { + options[strings.TrimSpace(o[0])] = strings.TrimSpace(o[1]) + } + } + + return options +} + +// getRelatedField returns first matching field. +func getRelatedField(instance interface{}, name string) (string, TagOptions) { + var ( + value = reflect.Indirect(reflect.ValueOf(instance)) + fieldName string + tagOptions TagOptions + ) + + for i := 0; i < value.NumField(); i++ { + var ( + vField = value.Field(i) + tField = value.Type().Field(i) + tagOptions = getTagOptions(tField.Tag.Get(TagName)) + ) + + if tField.Type.Kind() == reflect.Struct && tField.Anonymous { + if n, o := getRelatedField(vField.Interface(), name); n != "" { + return n, o + } + } + + if v, ok := tagOptions[FieldOptionName]; ok && v == name { + return tField.Name, tagOptions + } + + if tField.Name == name { + return tField.Name, tagOptions + } + } + + return fieldName, tagOptions +} + +// getMethodNames returns instance's method names. +func getMethodNames(instance interface{}) []string { + var methods []string + + t := reflect.TypeOf(instance) + for i := 0; i < t.NumMethod(); i++ { + methods = append(methods, t.Method(i).Name) + } + + return methods +} + +// getFieldNames returns instance's field names. +func getFieldNames(instance interface{}) []string { + var ( + fields []string + v = reflect.Indirect(reflect.ValueOf(instance)) + t = v.Type() + ) + + if t.Kind() != reflect.Struct { + return nil + } + + for i := 0; i < v.NumField(); i++ { + var ( + vField = v.Field(i) + tField = v.Type().Field(i) + ) + + // Is exportable? + if tField.PkgPath != "" { + continue + } + + if tField.Type.Kind() == reflect.Struct && tField.Anonymous { + fields = append(fields, getFieldNames(vField.Interface())...) + continue + } + + fields = append(fields, tField.Name) + } + + return fields +} + +// isNullableType returns true if the given type is a nullable one. +func isNullableType(t reflect.Type) bool { + return t.ConvertibleTo(reflect.TypeOf((*driver.Valuer)(nil)).Elem()) +} |