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/
replace_op.go
179 lines (146 loc) · 4.33 KB
/
replace_op.go
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package patch
import (
"fmt"
"gopkg.in/yaml.v2"
)
type ReplaceOp struct {
Path Pointer
Value interface{} // will be cloned using yaml library
}
func (op ReplaceOp) Apply(doc interface{}) (interface{}, error) {
// Ensure that value is not modified by future operations
clonedValue, err := op.cloneValue(op.Value)
if err != nil {
return nil, fmt.Errorf("ReplaceOp cloning value: %s", err)
}
tokens := op.Path.Tokens()
if len(tokens) == 1 {
return clonedValue, nil
}
obj := doc
prevUpdate := func(newObj interface{}) { doc = newObj }
for i, token := range tokens[1:] {
isLast := i == len(tokens)-2
switch typedToken := token.(type) {
case IndexToken:
typedObj, ok := obj.([]interface{})
if !ok {
return nil, newOpArrayMismatchTypeErr(tokens[:i+2], obj)
}
if isLast {
idx, err := ArrayInsertion{Index: typedToken.Index, Modifiers: typedToken.Modifiers, Array: typedObj}.Concrete()
if err != nil {
return nil, err
}
prevUpdate(idx.Update(typedObj, clonedValue))
} else {
idx, err := ArrayIndex{Index: typedToken.Index, Modifiers: typedToken.Modifiers, Array: typedObj}.Concrete()
if err != nil {
return nil, err
}
obj = typedObj[idx]
prevUpdate = func(newObj interface{}) { typedObj[idx] = newObj }
}
case AfterLastIndexToken:
typedObj, ok := obj.([]interface{})
if !ok {
return nil, newOpArrayMismatchTypeErr(tokens[:i+2], obj)
}
if isLast {
prevUpdate(append(typedObj, clonedValue))
} else {
return nil, fmt.Errorf("Expected after last index token to be last in path '%s'", op.Path)
}
case MatchingIndexToken:
typedObj, ok := obj.([]interface{})
if !ok {
return nil, newOpArrayMismatchTypeErr(tokens[:i+2], obj)
}
var idxs []int
for itemIdx, item := range typedObj {
typedItem, ok := item.(map[interface{}]interface{})
if ok {
if typedItem[typedToken.Key] == typedToken.Value {
idxs = append(idxs, itemIdx)
}
}
}
if typedToken.Optional && len(idxs) == 0 {
if isLast {
prevUpdate(append(typedObj, clonedValue))
} else {
obj = map[interface{}]interface{}{typedToken.Key: typedToken.Value}
prevUpdate(append(typedObj, obj))
// no need to change prevUpdate since matching item can only be a map
}
} else {
if len(idxs) != 1 {
return nil, opMultipleMatchingIndexErr{NewPointer(tokens[:i+2]), idxs}
}
if isLast {
idx, err := ArrayInsertion{Index: idxs[0], Modifiers: typedToken.Modifiers, Array: typedObj}.Concrete()
if err != nil {
return nil, err
}
prevUpdate(idx.Update(typedObj, clonedValue))
} else {
idx, err := ArrayIndex{Index: idxs[0], Modifiers: typedToken.Modifiers, Array: typedObj}.Concrete()
if err != nil {
return nil, err
}
obj = typedObj[idx]
// no need to change prevUpdate since matching item can only be a map
}
}
case KeyToken:
typedObj, ok := obj.(map[interface{}]interface{})
if !ok {
return nil, newOpMapMismatchTypeErr(tokens[:i+2], obj)
}
var found bool
obj, found = typedObj[typedToken.Key]
if !found && !typedToken.Optional {
return nil, opMissingMapKeyErr{typedToken.Key, NewPointer(tokens[:i+2]), typedObj}
}
if isLast {
typedObj[typedToken.Key] = clonedValue
} else {
prevUpdate = func(newObj interface{}) { typedObj[typedToken.Key] = newObj }
if !found {
// Determine what type of value to create based on next token
switch tokens[i+2].(type) {
case AfterLastIndexToken:
obj = []interface{}{}
case MatchingIndexToken:
obj = []interface{}{}
case KeyToken:
obj = map[interface{}]interface{}{}
default:
errMsg := "Expected to find key, matching index or after last index token at path '%s'"
return nil, fmt.Errorf(errMsg, NewPointer(tokens[:i+3]))
}
typedObj[typedToken.Key] = obj
}
}
default:
return nil, opUnexpectedTokenErr{token, NewPointer(tokens[:i+2])}
}
}
return doc, nil
}
func (ReplaceOp) cloneValue(in interface{}) (out interface{}, err error) {
defer func() {
if recoverVal := recover(); recoverVal != nil {
err = fmt.Errorf("Recovered: %s", recoverVal)
}
}()
bytes, err := yaml.Marshal(in)
if err != nil {
return nil, err
}
err = yaml.Unmarshal(bytes, &out)
if err != nil {
return nil, err
}
return out, nil
}