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op_keys.go
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op_keys.go
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package spruce
import (
"fmt"
"sort"
"github.com/starkandwayne/goutils/ansi"
. "github.com/geofffranks/spruce/log"
"github.com/starkandwayne/goutils/tree"
)
// KeysOperator ...
type KeysOperator struct{}
// Setup ...
func (KeysOperator) Setup() error {
return nil
}
// Phase ...
func (KeysOperator) Phase() OperatorPhase {
return EvalPhase
}
// Dependencies ...
func (KeysOperator) Dependencies(_ *Evaluator, _ []*Expr, _ []*tree.Cursor, auto []*tree.Cursor) []*tree.Cursor {
return auto
}
// Run ...
func (KeysOperator) Run(ev *Evaluator, args []*Expr) (*Response, error) {
DEBUG("running (( keys ... )) operation at $.%s", ev.Here)
defer DEBUG("done with (( keys ... )) operation at $%s\n", ev.Here)
var vals []string
for i, arg := range args {
v, err := arg.Resolve(ev.Tree)
if err != nil {
DEBUG(" [%d]: resolution failed\n error: %s", i, err)
return nil, err
}
switch v.Type {
case Literal:
DEBUG(" arg[%d]: found string literal '%s'", i, v.Literal)
DEBUG(" (keys operator only handles references to other parts of the YAML tree)")
return nil, fmt.Errorf("keys operator only accepts key reference arguments")
case Reference:
DEBUG(" arg[%d]: trying to resolve reference $.%s", i, v.Reference)
s, err := v.Reference.Resolve(ev.Tree)
if err != nil {
DEBUG(" [%d]: resolution failed\n error: %s", i, err)
return nil, fmt.Errorf("Unable to resolve `%s`: %s", v.Reference, err)
}
m, ok := s.(map[interface{}]interface{})
if !ok {
DEBUG(" [%d]: resolved to something that is not a map. that is unacceptable.", i)
return nil, ansi.Errorf("@c{%s} @R{is not a map}", v.Reference)
}
DEBUG(" [%d]: resolved to a map; extracting keys", i)
for k := range m {
vals = append(vals, k.(string))
}
default:
DEBUG(" arg[%d]: I don't know what to do with '%v'", i, arg)
return nil, fmt.Errorf("keys operator only accepts key reference arguments")
}
DEBUG("")
}
switch len(args) {
case 0:
DEBUG(" no arguments supplied to (( keys ... )) operation. oops.")
return nil, ansi.Errorf("no arguments specified to @c{(( keys ... ))}")
default:
sort.Strings(vals)
return &Response{
Type: Replace,
Value: vals,
}, nil
}
}
func init() {
RegisterOp("keys", KeysOperator{})
}