/
data_navigator.go
302 lines (254 loc) · 7.34 KB
/
data_navigator.go
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package main
import (
"fmt"
"sort"
"strconv"
"gopkg.in/yaml.v2"
)
func entryInSlice(context yaml.MapSlice, key interface{}) *yaml.MapItem {
for idx := range context {
var entry = &context[idx]
if entry.Key == key {
return entry
}
}
return nil
}
func getMapSlice(context interface{}) yaml.MapSlice {
var mapSlice yaml.MapSlice
switch context.(type) {
case yaml.MapSlice:
mapSlice = context.(yaml.MapSlice)
default:
mapSlice = make(yaml.MapSlice, 0)
}
return mapSlice
}
func getArray(context interface{}) (array []interface{}, ok bool) {
switch context.(type) {
case []interface{}:
array = context.([]interface{})
ok = true
default:
array = make([]interface{}, 0)
ok = false
}
return
}
func writeMap(context interface{}, paths []string, value interface{}) yaml.MapSlice {
log.Debugf("writeMap for %v for %v with value %v\n", paths, context, value)
mapSlice := getMapSlice(context)
if len(paths) == 0 {
return mapSlice
}
child := entryInSlice(mapSlice, paths[0])
if child == nil {
newChild := yaml.MapItem{Key: paths[0]}
mapSlice = append(mapSlice, newChild)
child = entryInSlice(mapSlice, paths[0])
log.Debugf("\tAppended child at %v for mapSlice %v\n", paths[0], mapSlice)
}
log.Debugf("\tchild.Value %v\n", child.Value)
remainingPaths := paths[1:]
child.Value = updatedChildValue(child.Value, remainingPaths, value)
log.Debugf("\tReturning mapSlice %v\n", mapSlice)
return mapSlice
}
func updatedChildValue(child interface{}, remainingPaths []string, value interface{}) interface{} {
if len(remainingPaths) == 0 {
return value
}
_, nextIndexErr := strconv.ParseInt(remainingPaths[0], 10, 64)
if nextIndexErr != nil && remainingPaths[0] != "+" {
// must be a map
return writeMap(child, remainingPaths, value)
}
// must be an array
return writeArray(child, remainingPaths, value)
}
func writeArray(context interface{}, paths []string, value interface{}) []interface{} {
log.Debugf("writeArray for %v for %v with value %v\n", paths, context, value)
array, _ := getArray(context)
if len(paths) == 0 {
return array
}
log.Debugf("\tarray %v\n", array)
rawIndex := paths[0]
var index int64
// the append array indicator
if rawIndex == "+" {
index = int64(len(array))
} else {
index, _ = strconv.ParseInt(rawIndex, 10, 64)
}
// writeArray is only called by updatedChildValue which handles parsing the
// index, as such this renders this dead code.
// if err != nil {
// return array, fmt.Errorf("Error accessing array: %v", err)
// }
for index >= int64(len(array)) {
array = append(array, nil)
}
currentChild := array[index]
log.Debugf("\tcurrentChild %v\n", currentChild)
remainingPaths := paths[1:]
array[index] = updatedChildValue(currentChild, remainingPaths, value)
log.Debugf("\tReturning array %v\n", array)
return array
}
func readMap(context yaml.MapSlice, head string, tail []string) (interface{}, error) {
if head == "*" {
return readMapSplat(context, tail)
}
var value interface{}
entry := entryInSlice(context, head)
if entry != nil {
value = entry.Value
}
return calculateValue(value, tail)
}
func readMapSplat(context yaml.MapSlice, tail []string) (interface{}, error) {
var newArray = make([]interface{}, len(context))
var i = 0
for _, entry := range context {
if len(tail) > 0 {
val, err := recurse(entry.Value, tail[0], tail[1:])
if err != nil {
return nil, err
}
newArray[i] = val
} else {
newArray[i] = entry.Value
}
i++
}
return newArray, nil
}
func recurse(value interface{}, head string, tail []string) (interface{}, error) {
switch value.(type) {
case []interface{}:
if head == "*" {
return readArraySplat(value.([]interface{}), tail)
}
index, err := strconv.ParseInt(head, 10, 64)
if err != nil {
return nil, fmt.Errorf("Error accessing array: %v", err)
}
return readArray(value.([]interface{}), index, tail)
case yaml.MapSlice:
return readMap(value.(yaml.MapSlice), head, tail)
default:
return nil, nil
}
}
func readArray(array []interface{}, head int64, tail []string) (interface{}, error) {
if head >= int64(len(array)) {
return nil, nil
}
value := array[head]
return calculateValue(value, tail)
}
func readArraySplat(array []interface{}, tail []string) (interface{}, error) {
var newArray = make([]interface{}, len(array))
for index, value := range array {
val, err := calculateValue(value, tail)
if err != nil {
return nil, err
}
newArray[index] = val
}
return newArray, nil
}
func calculateValue(value interface{}, tail []string) (interface{}, error) {
if len(tail) > 0 {
return recurse(value, tail[0], tail[1:])
}
return value, nil
}
func mapToMapSlice(data map[interface{}]interface{}) yaml.MapSlice {
var mapSlice yaml.MapSlice
for k, v := range data {
if mv, ok := v.(map[interface{}]interface{}); ok {
v = mapToMapSlice(mv)
}
item := yaml.MapItem{Key: k, Value: v}
mapSlice = append(mapSlice, item)
}
// because the parsing of the yaml was done via a map the order will be inconsistent
// apply order to allow a consistent output
sort.SliceStable(mapSlice, func(i, j int) bool { return mapSlice[i].Key.(string) < mapSlice[j].Key.(string) })
return mapSlice
}
func deleteMap(context interface{}, paths []string) yaml.MapSlice {
log.Debugf("deleteMap for %v for %v\n", paths, context)
mapSlice := getMapSlice(context)
if len(paths) == 0 {
return mapSlice
}
var found bool
var index int
var child yaml.MapItem
for index, child = range mapSlice {
if child.Key == paths[0] {
found = true
break
}
}
if !found {
return mapSlice
}
remainingPaths := paths[1:]
var newSlice yaml.MapSlice
if len(remainingPaths) > 0 {
newChild := yaml.MapItem{Key: child.Key}
newChild.Value = deleteChildValue(child.Value, remainingPaths)
newSlice = make(yaml.MapSlice, len(mapSlice))
for i := range mapSlice {
item := mapSlice[i]
if i == index {
item = newChild
}
newSlice[i] = item
}
} else {
// Delete item from slice at index
newSlice = append(mapSlice[:index], mapSlice[index+1:]...)
log.Debugf("\tDeleted item index %d from mapSlice", index)
}
log.Debugf("\t\tlen: %d\tcap: %d\tslice: %v", len(mapSlice), cap(mapSlice), mapSlice)
log.Debugf("\tReturning mapSlice %v\n", mapSlice)
return newSlice
}
func deleteArray(context interface{}, paths []string, index int64) interface{} {
log.Debugf("deleteArray for %v for %v\n", paths, context)
array, ok := getArray(context)
if !ok {
// did not get an array
return context
}
if index >= int64(len(array)) {
return array
}
remainingPaths := paths[1:]
if len(remainingPaths) > 0 {
// Recurse into the array element at index
array[index] = deleteMap(array[index], remainingPaths)
} else {
// Delete the array element at index
array = append(array[:index], array[index+1:]...)
log.Debugf("\tDeleted item index %d from array, leaving %v", index, array)
}
log.Debugf("\tReturning array: %v\n", array)
return array
}
func deleteChildValue(child interface{}, remainingPaths []string) interface{} {
log.Debugf("deleteChildValue for %v for %v\n", remainingPaths, child)
idx, nextIndexErr := strconv.ParseInt(remainingPaths[0], 10, 64)
if nextIndexErr != nil {
// must be a map
log.Debugf("\tdetected a map, invoking deleteMap\n")
return deleteMap(child, remainingPaths)
}
log.Debugf("\tdetected an array, so traversing element with index %d\n", idx)
return deleteArray(child, remainingPaths, idx)
}