diff options
Diffstat (limited to 'vendor/dario.cat/mergo/merge.go')
| -rw-r--r-- | vendor/dario.cat/mergo/merge.go | 409 |
1 files changed, 0 insertions, 409 deletions
diff --git a/vendor/dario.cat/mergo/merge.go b/vendor/dario.cat/mergo/merge.go deleted file mode 100644 index 0ef9b21..0000000 --- a/vendor/dario.cat/mergo/merge.go +++ /dev/null @@ -1,409 +0,0 @@ -// Copyright 2013 Dario Castañé. All rights reserved. -// Copyright 2009 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Based on src/pkg/reflect/deepequal.go from official -// golang's stdlib. - -package mergo - -import ( - "fmt" - "reflect" -) - -func hasMergeableFields(dst reflect.Value) (exported bool) { - for i, n := 0, dst.NumField(); i < n; i++ { - field := dst.Type().Field(i) - if field.Anonymous && dst.Field(i).Kind() == reflect.Struct { - exported = exported || hasMergeableFields(dst.Field(i)) - } else if isExportedComponent(&field) { - exported = exported || len(field.PkgPath) == 0 - } - } - return -} - -func isExportedComponent(field *reflect.StructField) bool { - pkgPath := field.PkgPath - if len(pkgPath) > 0 { - return false - } - c := field.Name[0] - if 'a' <= c && c <= 'z' || c == '_' { - return false - } - return true -} - -type Config struct { - Transformers Transformers - Overwrite bool - ShouldNotDereference bool - AppendSlice bool - TypeCheck bool - overwriteWithEmptyValue bool - overwriteSliceWithEmptyValue bool - sliceDeepCopy bool - debug bool -} - -type Transformers interface { - Transformer(reflect.Type) func(dst, src reflect.Value) error -} - -// Traverses recursively both values, assigning src's fields values to dst. -// The map argument tracks comparisons that have already been seen, which allows -// short circuiting on recursive types. -func deepMerge(dst, src reflect.Value, visited map[uintptr]*visit, depth int, config *Config) (err error) { - overwrite := config.Overwrite - typeCheck := config.TypeCheck - overwriteWithEmptySrc := config.overwriteWithEmptyValue - overwriteSliceWithEmptySrc := config.overwriteSliceWithEmptyValue - sliceDeepCopy := config.sliceDeepCopy - - if !src.IsValid() { - return - } - if dst.CanAddr() { - addr := dst.UnsafeAddr() - h := 17 * addr - seen := visited[h] - typ := dst.Type() - for p := seen; p != nil; p = p.next { - if p.ptr == addr && p.typ == typ { - return nil - } - } - // Remember, remember... - visited[h] = &visit{typ, seen, addr} - } - - if config.Transformers != nil && !isReflectNil(dst) && dst.IsValid() { - if fn := config.Transformers.Transformer(dst.Type()); fn != nil { - err = fn(dst, src) - return - } - } - - switch dst.Kind() { - case reflect.Struct: - if hasMergeableFields(dst) { - for i, n := 0, dst.NumField(); i < n; i++ { - if err = deepMerge(dst.Field(i), src.Field(i), visited, depth+1, config); err != nil { - return - } - } - } else { - if dst.CanSet() && (isReflectNil(dst) || overwrite) && (!isEmptyValue(src, !config.ShouldNotDereference) || overwriteWithEmptySrc) { - dst.Set(src) - } - } - case reflect.Map: - if dst.IsNil() && !src.IsNil() { - if dst.CanSet() { - dst.Set(reflect.MakeMap(dst.Type())) - } else { - dst = src - return - } - } - - if src.Kind() != reflect.Map { - if overwrite && dst.CanSet() { - dst.Set(src) - } - return - } - - for _, key := range src.MapKeys() { - srcElement := src.MapIndex(key) - if !srcElement.IsValid() { - continue - } - dstElement := dst.MapIndex(key) - switch srcElement.Kind() { - case reflect.Chan, reflect.Func, reflect.Map, reflect.Interface, reflect.Slice: - if srcElement.IsNil() { - if overwrite { - dst.SetMapIndex(key, srcElement) - } - continue - } - fallthrough - default: - if !srcElement.CanInterface() { - continue - } - switch reflect.TypeOf(srcElement.Interface()).Kind() { - case reflect.Struct: - fallthrough - case reflect.Ptr: - fallthrough - case reflect.Map: - srcMapElm := srcElement - dstMapElm := dstElement - if srcMapElm.CanInterface() { - srcMapElm = reflect.ValueOf(srcMapElm.Interface()) - if dstMapElm.IsValid() { - dstMapElm = reflect.ValueOf(dstMapElm.Interface()) - } - } - if err = deepMerge(dstMapElm, srcMapElm, visited, depth+1, config); err != nil { - return - } - case reflect.Slice: - srcSlice := reflect.ValueOf(srcElement.Interface()) - - var dstSlice reflect.Value - if !dstElement.IsValid() || dstElement.IsNil() { - dstSlice = reflect.MakeSlice(srcSlice.Type(), 0, srcSlice.Len()) - } else { - dstSlice = reflect.ValueOf(dstElement.Interface()) - } - - if (!isEmptyValue(src, !config.ShouldNotDereference) || overwriteWithEmptySrc || overwriteSliceWithEmptySrc) && (overwrite || isEmptyValue(dst, !config.ShouldNotDereference)) && !config.AppendSlice && !sliceDeepCopy { - if typeCheck && srcSlice.Type() != dstSlice.Type() { - return fmt.Errorf("cannot override two slices with different type (%s, %s)", srcSlice.Type(), dstSlice.Type()) - } - dstSlice = srcSlice - } else if config.AppendSlice { - if srcSlice.Type() != dstSlice.Type() { - return fmt.Errorf("cannot append two slices with different type (%s, %s)", srcSlice.Type(), dstSlice.Type()) - } - dstSlice = reflect.AppendSlice(dstSlice, srcSlice) - } else if sliceDeepCopy { - i := 0 - for ; i < srcSlice.Len() && i < dstSlice.Len(); i++ { - srcElement := srcSlice.Index(i) - dstElement := dstSlice.Index(i) - - if srcElement.CanInterface() { - srcElement = reflect.ValueOf(srcElement.Interface()) - } - if dstElement.CanInterface() { - dstElement = reflect.ValueOf(dstElement.Interface()) - } - - if err = deepMerge(dstElement, srcElement, visited, depth+1, config); err != nil { - return - } - } - - } - dst.SetMapIndex(key, dstSlice) - } - } - - if dstElement.IsValid() && !isEmptyValue(dstElement, !config.ShouldNotDereference) { - if reflect.TypeOf(srcElement.Interface()).Kind() == reflect.Slice { - continue - } - if reflect.TypeOf(srcElement.Interface()).Kind() == reflect.Map && reflect.TypeOf(dstElement.Interface()).Kind() == reflect.Map { - continue - } - } - - if srcElement.IsValid() && ((srcElement.Kind() != reflect.Ptr && overwrite) || !dstElement.IsValid() || isEmptyValue(dstElement, !config.ShouldNotDereference)) { - if dst.IsNil() { - dst.Set(reflect.MakeMap(dst.Type())) - } - dst.SetMapIndex(key, srcElement) - } - } - - // Ensure that all keys in dst are deleted if they are not in src. - if overwriteWithEmptySrc { - for _, key := range dst.MapKeys() { - srcElement := src.MapIndex(key) - if !srcElement.IsValid() { - dst.SetMapIndex(key, reflect.Value{}) - } - } - } - case reflect.Slice: - if !dst.CanSet() { - break - } - if (!isEmptyValue(src, !config.ShouldNotDereference) || overwriteWithEmptySrc || overwriteSliceWithEmptySrc) && (overwrite || isEmptyValue(dst, !config.ShouldNotDereference)) && !config.AppendSlice && !sliceDeepCopy { - dst.Set(src) - } else if config.AppendSlice { - if src.Type() != dst.Type() { - return fmt.Errorf("cannot append two slice with different type (%s, %s)", src.Type(), dst.Type()) - } - dst.Set(reflect.AppendSlice(dst, src)) - } else if sliceDeepCopy { - for i := 0; i < src.Len() && i < dst.Len(); i++ { - srcElement := src.Index(i) - dstElement := dst.Index(i) - if srcElement.CanInterface() { - srcElement = reflect.ValueOf(srcElement.Interface()) - } - if dstElement.CanInterface() { - dstElement = reflect.ValueOf(dstElement.Interface()) - } - - if err = deepMerge(dstElement, srcElement, visited, depth+1, config); err != nil { - return - } - } - } - case reflect.Ptr: - fallthrough - case reflect.Interface: - if isReflectNil(src) { - if overwriteWithEmptySrc && dst.CanSet() && src.Type().AssignableTo(dst.Type()) { - dst.Set(src) - } - break - } - - if src.Kind() != reflect.Interface { - if dst.IsNil() || (src.Kind() != reflect.Ptr && overwrite) { - if dst.CanSet() && (overwrite || isEmptyValue(dst, !config.ShouldNotDereference)) { - dst.Set(src) - } - } else if src.Kind() == reflect.Ptr { - if !config.ShouldNotDereference { - if err = deepMerge(dst.Elem(), src.Elem(), visited, depth+1, config); err != nil { - return - } - } else { - if overwriteWithEmptySrc || (overwrite && !src.IsNil()) || dst.IsNil() { - dst.Set(src) - } - } - } else if dst.Elem().Type() == src.Type() { - if err = deepMerge(dst.Elem(), src, visited, depth+1, config); err != nil { - return - } - } else { - return ErrDifferentArgumentsTypes - } - break - } - - if dst.IsNil() || overwrite { - if dst.CanSet() && (overwrite || isEmptyValue(dst, !config.ShouldNotDereference)) { - dst.Set(src) - } - break - } - - if dst.Elem().Kind() == src.Elem().Kind() { - if err = deepMerge(dst.Elem(), src.Elem(), visited, depth+1, config); err != nil { - return - } - break - } - default: - mustSet := (isEmptyValue(dst, !config.ShouldNotDereference) || overwrite) && (!isEmptyValue(src, !config.ShouldNotDereference) || overwriteWithEmptySrc) - if mustSet { - if dst.CanSet() { - dst.Set(src) - } else { - dst = src - } - } - } - - return -} - -// Merge will fill any empty for value type attributes on the dst struct using corresponding -// src attributes if they themselves are not empty. dst and src must be valid same-type structs -// and dst must be a pointer to struct. -// It won't merge unexported (private) fields and will do recursively any exported field. -func Merge(dst, src interface{}, opts ...func(*Config)) error { - return merge(dst, src, opts...) -} - -// MergeWithOverwrite will do the same as Merge except that non-empty dst attributes will be overridden by -// non-empty src attribute values. -// Deprecated: use Merge(…) with WithOverride -func MergeWithOverwrite(dst, src interface{}, opts ...func(*Config)) error { - return merge(dst, src, append(opts, WithOverride)...) -} - -// WithTransformers adds transformers to merge, allowing to customize the merging of some types. -func WithTransformers(transformers Transformers) func(*Config) { - return func(config *Config) { - config.Transformers = transformers - } -} - -// WithOverride will make merge override non-empty dst attributes with non-empty src attributes values. -func WithOverride(config *Config) { - config.Overwrite = true -} - -// WithOverwriteWithEmptyValue will make merge override non empty dst attributes with empty src attributes values. -func WithOverwriteWithEmptyValue(config *Config) { - config.Overwrite = true - config.overwriteWithEmptyValue = true -} - -// WithOverrideEmptySlice will make merge override empty dst slice with empty src slice. -func WithOverrideEmptySlice(config *Config) { - config.overwriteSliceWithEmptyValue = true -} - -// WithoutDereference prevents dereferencing pointers when evaluating whether they are empty -// (i.e. a non-nil pointer is never considered empty). -func WithoutDereference(config *Config) { - config.ShouldNotDereference = true -} - -// WithAppendSlice will make merge append slices instead of overwriting it. -func WithAppendSlice(config *Config) { - config.AppendSlice = true -} - -// WithTypeCheck will make merge check types while overwriting it (must be used with WithOverride). -func WithTypeCheck(config *Config) { - config.TypeCheck = true -} - -// WithSliceDeepCopy will merge slice element one by one with Overwrite flag. -func WithSliceDeepCopy(config *Config) { - config.sliceDeepCopy = true - config.Overwrite = true -} - -func merge(dst, src interface{}, opts ...func(*Config)) error { - if dst != nil && reflect.ValueOf(dst).Kind() != reflect.Ptr { - return ErrNonPointerArgument - } - var ( - vDst, vSrc reflect.Value - err error - ) - - config := &Config{} - - for _, opt := range opts { - opt(config) - } - - if vDst, vSrc, err = resolveValues(dst, src); err != nil { - return err - } - if vDst.Type() != vSrc.Type() { - return ErrDifferentArgumentsTypes - } - return deepMerge(vDst, vSrc, make(map[uintptr]*visit), 0, config) -} - -// IsReflectNil is the reflect value provided nil -func isReflectNil(v reflect.Value) bool { - k := v.Kind() - switch k { - case reflect.Interface, reflect.Slice, reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr: - // Both interface and slice are nil if first word is 0. - // Both are always bigger than a word; assume flagIndir. - return v.IsNil() - default: - return false - } -} |