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evaluation_ctx.go
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/
evaluation_ctx.go
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package yamltemplate
import (
"fmt"
"github.com/k14s/ytt/pkg/orderedmap"
"github.com/k14s/ytt/pkg/template"
"github.com/k14s/ytt/pkg/yamlmeta"
)
const (
EvaluationCtxDialectName template.EvaluationCtxDialectName = "yaml"
)
type EvaluationCtx struct{}
var _ template.EvaluationCtxDialect = EvaluationCtx{}
func (e EvaluationCtx) PrepareNode(
parentNode template.EvaluationNode, val template.EvaluationNode) error {
if typedMap, ok := parentNode.(*yamlmeta.Map); ok {
if typedMapItem, ok := val.(*yamlmeta.MapItem); ok {
return MapItemOverride{}.Apply(typedMap, typedMapItem)
}
}
return nil
}
func (e EvaluationCtx) SetMapItemKey(node template.EvaluationNode, val interface{}) error {
if item, ok := node.(*yamlmeta.MapItem); ok {
item.Key = val
return nil
}
panic(fmt.Sprintf("expected node '%T' to be MapItem", node))
}
func (e EvaluationCtx) Replace(
parentNodes []template.EvaluationNode, val interface{}) error {
switch typedCurrNode := parentNodes[len(parentNodes)-1].(type) {
case *yamlmeta.Document:
if len(parentNodes) < 2 {
return fmt.Errorf("expected to find document set, but was not enough parents")
}
parentNode := parentNodes[len(parentNodes)-2]
typedParentNode, ok := parentNode.(*yamlmeta.DocumentSet)
if !ok {
return fmt.Errorf("expected to find document set, but was %T", parentNode)
}
return e.replaceItemInDocSet(typedParentNode, typedCurrNode, val)
case *yamlmeta.MapItem:
if len(parentNodes) < 2 {
return fmt.Errorf("expected to find map, but was not enough parents")
}
parentNode := parentNodes[len(parentNodes)-2]
typedParentNode, ok := parentNode.(*yamlmeta.Map)
if !ok {
return fmt.Errorf("expected parent of map item to be map, but was %T", parentNode)
}
return e.replaceItemInMap(typedParentNode, typedCurrNode, val)
case *yamlmeta.ArrayItem:
if len(parentNodes) < 2 {
return fmt.Errorf("expected to find array, but was not enough parents")
}
parentNode := parentNodes[len(parentNodes)-2]
typedParentNode, ok := parentNode.(*yamlmeta.Array)
if !ok {
return fmt.Errorf("expected parent of array item to be array, but was %T", parentNode)
}
return e.replaceItemInArray(typedParentNode, typedCurrNode, val)
default:
return fmt.Errorf("expected to replace document value, map item or array item, but found %T", typedCurrNode)
}
}
func (e EvaluationCtx) replaceItemInDocSet(dstDocSet *yamlmeta.DocumentSet, placeholderItem *yamlmeta.Document, val interface{}) error {
insertItems, err := e.convertValToDocSetItems(val)
if err != nil {
return err
}
for i, item := range dstDocSet.Items {
if item == placeholderItem {
newItems := dstDocSet.Items[:i]
newItems = append(newItems, insertItems...)
newItems = append(newItems, dstDocSet.Items[i+1:]...)
dstDocSet.Items = newItems
return nil
}
}
return fmt.Errorf("expected to find placeholder doc in docset")
}
func (e EvaluationCtx) convertValToDocSetItems(val interface{}) ([]*yamlmeta.Document, error) {
result := []*yamlmeta.Document{}
switch typedVal := val.(type) {
case []interface{}:
for _, item := range typedVal {
result = append(result, &yamlmeta.Document{Value: item})
}
case *yamlmeta.DocumentSet:
result = typedVal.Items
default:
return nil, fmt.Errorf("expected value to be docset, but was %T", val)
}
return result, nil
}
func (e EvaluationCtx) replaceItemInMap(
dstMap *yamlmeta.Map, placeholderItem *yamlmeta.MapItem, val interface{}) error {
insertItems, carryMeta, err := e.convertValToMapItems(val)
if err != nil {
return err
}
// If map items does not carry metadata
// we cannot check for override conflicts
if carryMeta {
for _, newItem := range insertItems {
err := MapItemOverride{}.Apply(dstMap, newItem)
if err != nil {
return err
}
}
}
for i, item := range dstMap.Items {
if item == placeholderItem {
newItems := dstMap.Items[:i]
newItems = append(newItems, insertItems...)
newItems = append(newItems, dstMap.Items[i+1:]...)
dstMap.Items = newItems
return nil
}
}
return fmt.Errorf("expected to find placeholder map item in map")
}
func (e EvaluationCtx) convertValToMapItems(val interface{}) ([]*yamlmeta.MapItem, bool, error) {
switch typedVal := val.(type) {
case *orderedmap.Map:
result := []*yamlmeta.MapItem{}
typedVal.Iterate(func(k, v interface{}) {
result = append(result, &yamlmeta.MapItem{Key: k, Value: v})
})
return result, false, nil
case *yamlmeta.Map:
return typedVal.Items, true, nil
default:
return nil, false, fmt.Errorf("expected value to be map, but was %T", val)
}
}
func (e EvaluationCtx) replaceItemInArray(dstArray *yamlmeta.Array, placeholderItem *yamlmeta.ArrayItem, val interface{}) error {
insertItems, err := e.convertValToArrayItems(val)
if err != nil {
return err
}
for i, item := range dstArray.Items {
if item == placeholderItem {
newItems := dstArray.Items[:i]
newItems = append(newItems, insertItems...)
newItems = append(newItems, dstArray.Items[i+1:]...)
dstArray.Items = newItems
return nil
}
}
return fmt.Errorf("expected to find placeholder array item in array")
}
func (e EvaluationCtx) convertValToArrayItems(val interface{}) ([]*yamlmeta.ArrayItem, error) {
result := []*yamlmeta.ArrayItem{}
switch typedVal := val.(type) {
case []interface{}:
for _, item := range typedVal {
result = append(result, &yamlmeta.ArrayItem{Value: item})
}
case *yamlmeta.Array:
result = typedVal.Items
default:
return nil, fmt.Errorf("expected value to be array, but was %T", val)
}
return result, nil
}
func (e EvaluationCtx) ShouldWrapRootValue(nodeVal interface{}) bool {
switch nodeVal.(type) {
case *yamlmeta.Document, *yamlmeta.MapItem, *yamlmeta.ArrayItem:
return true
default:
return false
}
}
func (e EvaluationCtx) WrapRootValue(val interface{}) interface{} {
return &StarlarkFragment{val}
}