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marker.go
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marker.go
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package dynaml
import (
"fmt"
"strings"
"github.com/mandelsoft/spiff/debug"
"github.com/mandelsoft/spiff/yaml"
)
const (
TEMPORARY = "&temporary"
TEMPLATE = "&template"
LOCAL = "&local"
INJECT = "&inject"
DEFAULT = "&default"
STATE = "&state"
DYNAMIC = "&dynamic" // POC
)
type MarkerExpr struct {
list []string
expr Expression
}
func NewTemplateMarker(expr Expression) MarkerExpr {
return MarkerExpr{list: []string{TEMPLATE}, expr: expr}
}
func (e MarkerExpr) Add(marker string) MarkerExpr {
for _, v := range e.list {
if v == marker {
return e
}
}
e.list = append(e.list, marker)
return e
}
func (e MarkerExpr) String() string {
if e.expr != nil {
return fmt.Sprintf("%s (%s)", strings.Join(e.list, " "), e.expr)
}
return fmt.Sprintf("%s", strings.Join(e.list, " "))
}
func (e MarkerExpr) GetTag() string {
for _, m := range e.list {
if strings.HasPrefix(m, "&tag:") {
return m[5:]
}
}
return ""
}
func (e MarkerExpr) GetFlags() yaml.NodeFlags {
var flags yaml.NodeFlags
for _, m := range e.list {
switch m {
case TEMPORARY:
flags.SetTemporary()
case LOCAL:
flags.SetLocal()
case INJECT:
flags.SetInject()
case DEFAULT:
flags.SetDefault()
case STATE:
flags.SetState()
case DYNAMIC:
flags.SetDynamic()
}
}
return flags
}
func (e MarkerExpr) Evaluate(binding Binding, locally bool) (interface{}, EvaluationInfo, bool) {
info := DefaultInfo()
if e.Has(TEMPLATE) {
info.Issue = yaml.NewIssue("&template only usable as marker for templates")
return nil, info, false
}
info.AddFlags(e.GetFlags())
if e.expr != nil {
result, infoe, ok := e.expr.Evaluate(binding, locally)
infoe = infoe.Join(info)
return result, infoe, ok
}
return nil, info, true
}
func (e MarkerExpr) setExpression(expr Expression) MarkerExpr {
e.expr = expr
return e
}
func (e MarkerExpr) Has(t string) bool {
for _, v := range e.list {
if v == t {
return true
}
}
return false
}
func (e MarkerExpr) add(m string) MarkerExpr {
e.list = append(e.list, m)
return e
}
func (e MarkerExpr) TemplateExpression(orig yaml.Node) yaml.Node {
nlist := []string{}
for _, m := range e.list {
if m != TEMPLATE {
debug.Debug(" preserving marker %s", m)
nlist = append(nlist, m)
} else {
debug.Debug(" omitting marker %s", m)
}
}
m := MarkerExpr{nlist, e.expr}
// TODO: remove case
if false && len(nlist) > 0 {
return yaml.SubstituteNode(fmt.Sprintf("(( %s ))", m), orig)
}
if e.expr != nil {
return yaml.AddFlags(yaml.SubstituteNode(fmt.Sprintf("(( %s ))", e.expr), orig), m.GetFlags())
}
return nil
}
func (e MarkerExpr) MarshalYAML() (tag string, value interface{}, err error) {
return "", fmt.Sprintf("(( %s ))", e.String()), nil
}
func newMarkerExpr(m string) MarkerExpr {
return MarkerExpr{list: []string{m}}
}
type MarkerExpressionExpr struct {
contents string
expr Expression
}
func (e MarkerExpressionExpr) String() string {
return e.contents
}
func (e MarkerExpressionExpr) Evaluate(binding Binding, locally bool) (interface{}, EvaluationInfo, bool) {
return e.expr.Evaluate(binding, locally)
}