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mapmerge.go
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mapmerge.go
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package dynaml
import (
"fmt"
"github.com/mandelsoft/spiff/yaml"
)
func func_merge(arguments []interface{}, binding Binding) (interface{}, EvaluationInfo, bool) {
info := DefaultInfo()
if len(arguments) < 1 {
return info.Error("at least one argument required for merge function")
}
args := []yaml.Node{}
if len(arguments) == 1 {
l, ok := arguments[0].([]yaml.Node)
if ok {
for i, e := range l {
m, err := getMap(i, e.Value())
if err != nil {
return info.Error("merge: entry of list argument: %s", err)
}
args = append(args, yaml.NewNode(m, "dynaml"))
}
if len(args) == 0 {
return info.Error("merge: no map found for merge")
}
}
}
if len(args) == 0 {
for i, arg := range arguments {
m, err := getMap(i, arg)
if err != nil {
return info.Error("merge: argument %s", err)
}
args = append(args, yaml.NewNode(m, "dynaml"))
}
}
result, err := binding.Cascade(binding, args[0], false, args[1:]...)
if err != nil {
info.SetError("merging failed: %s", err)
return nil, info, false
}
return result.Value(), info, true
}
func getMap(n int, arg interface{}) (map[string]yaml.Node, error) {
temp, ok := arg.(TemplateValue)
if ok {
arg, ok := node_copy(temp.Prepared).Value().(map[string]yaml.Node)
if !ok {
return nil, fmt.Errorf("%d: template is not a map template", n+1)
}
return arg, nil
}
m, ok := arg.(map[string]yaml.Node)
if ok {
return m, nil
}
return nil, fmt.Errorf("%d: no map or map template, but %s", n+1, ExpressionType(arg))
}