/
map.go
155 lines (139 loc) · 3.13 KB
/
map.go
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package template
import (
"fmt"
"github.com/flosch/pongo2"
)
// Map - Template map.
type Map map[string]MapNode
// MapNode - Template map node.
type MapNode interface {
Execute(Context) (interface{}, error)
}
// ParseMap - Parses map from context map.
func ParseMap(m Context) (res Map, err error) {
res = make(Map)
for key, value := range m {
res[key], err = parseNode(value)
if err != nil {
return
}
}
return
}
// Execute - Executes a map of templates and/or values.
func (nodes Map) Execute(ctx Context) (res Context, err error) {
res = make(Context)
for key, value := range nodes {
res[key], err = value.Execute(ctx)
if err != nil {
return
}
}
return
}
// ParseAndMerge - Parses a map of templates and merges into current map.
// If `t == nil` it may return a new map.
func (nodes Map) ParseAndMerge(input Context) (Map, error) {
if len(input) == 0 {
return nodes, nil
}
extra, err := ParseMap(input)
if err != nil {
return nil, err
}
for key, value := range extra {
nodes[key] = value
}
return nodes, nil
}
func parseNode(value interface{}) (MapNode, error) {
switch v := value.(type) {
case string:
t, err := pongo2.FromString(v)
if err != nil {
return nil, err
}
return &mapNodeTemplate{template: t}, nil
case map[string]string:
res := make(Map)
for key, mvalue := range v {
t, err := pongo2.FromString(mvalue)
if err != nil {
return nil, err
}
res[key] = &mapNodeTemplate{template: t}
}
return &mapNodeMap{nodes: res}, nil
case map[string]interface{}:
res, err := ParseMap(Context(v))
if err != nil {
return nil, err
}
return &mapNodeMap{nodes: res}, nil
case Context:
res, err := ParseMap(v)
if err != nil {
return nil, err
}
return &mapNodeMap{nodes: res}, nil
case map[interface{}]interface{}:
res := make(Map)
for k, mvalue := range v {
key, ok := k.(string)
if !ok {
return nil, fmt.Errorf("Invalid key %#v in templates map. All keys must be strings.", k)
}
n, err := parseNode(mvalue)
if err != nil {
return nil, err
}
res[key] = n
}
return &mapNodeMap{nodes: res}, nil
case []interface{}:
res := new(mapNodeSlice)
for _, svalue := range v {
n, err := parseNode(svalue)
if err != nil {
return nil, err
}
res.nodes = append(res.nodes, n)
}
return res, nil
}
return &mapNodeInterface{value: value}, nil
}
type mapNodeMap struct {
nodes Map
}
func (node *mapNodeMap) Execute(ctx Context) (interface{}, error) {
res, err := node.nodes.Execute(ctx)
return res, err
}
type mapNodeInterface struct {
value interface{}
}
func (node *mapNodeInterface) Execute(_ Context) (interface{}, error) {
return node.value, nil
}
type mapNodeSlice struct {
nodes []MapNode
}
func (node *mapNodeSlice) Execute(ctx Context) (interface{}, error) {
var res []interface{}
for _, n := range node.nodes {
v, err := n.Execute(ctx)
if err != nil {
return nil, err
}
res = append(res, v)
}
return res, nil
}
type mapNodeTemplate struct {
template *pongo2.Template
}
func (node *mapNodeTemplate) Execute(ctx Context) (interface{}, error) {
res, err := node.template.Execute(pongo2.Context(ctx))
return res, err
}