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reference.go
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reference.go
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package dynaml
import (
"strings"
"github.com/mandelsoft/spiff/debug"
"github.com/mandelsoft/spiff/yaml"
)
type ReferenceExpr struct {
Tag string
Path []string
}
func NewReferenceExpr(path ...string) ReferenceExpr {
return ReferenceExpr{"", path}
}
func NewTaggedReferenceExpr(tag string, path ...string) ReferenceExpr {
return ReferenceExpr{tag, path}
}
func (e ReferenceExpr) Evaluate(binding Binding, locally bool) (interface{}, EvaluationInfo, bool) {
var tag *Tag
fromRoot := e.Path[0] == ""
debug.Debug("reference: (%s)%v\n", e.Tag, e.Path)
sel := func(end int, path []string) (yaml.Node, bool) {
if fromRoot {
start := 0
if e.Path[0] == "" {
start = 1
}
return binding.FindFromRoot(path[start : end+1])
} else {
if tag != nil {
return yaml.Find(tag.Node(), binding.GetFeatures(), path...)
}
return binding.FindReference(path[:end+1])
}
}
if e.Tag != "" {
info := DefaultInfo()
if e.Tag != "doc:0" && e.Tag != "doc.0" {
tags := binding.GetState().GetTags(e.Tag)
if len(tags) == 0 {
return info.Error("tag '%s' not found", e.Tag)
}
if len(e.Path) == 1 && e.Path[0] == "" {
if len(tags) == 1 || tags[0].Name() == e.Tag {
return tags[0].Node().Value(), info, true
}
return info.Error("found multiple tags for '%s': %s", e.Tag, tagList(tags))
}
var val interface{}
var info EvaluationInfo
var found *TagInfo
for _, t := range tags {
tag = t.Tag()
if found != nil && found.Level() < t.Level() {
break
}
val1, info1, ok1 := e.find(sel, binding, locally)
if ok1 {
if tag.Name() == e.Tag {
return val1, info1, ok1
}
if found != nil {
if found.Level() == t.Level() {
return info.Error("ambigious tag resolution for %s: %s <-> %s", e.String(),
found.Name(), t.Name())
}
}
found = t
val = val1
info = info1
}
}
return val, info, found != nil
} else {
if len(e.Path) == 1 && e.Path[0] == "" {
return info.Error("no reference to actual document possible")
}
fromRoot = true
}
}
return e.find(sel, binding, locally)
}
func (e ReferenceExpr) String() string {
tag := ""
if e.Tag != "" {
tag = e.Tag + "::"
}
if len(e.Path) == 1 && e.Path[0] == "" {
return tag + "."
}
return tag + strings.Join(e.Path, ".")
}
func (e ReferenceExpr) find(f func(int, []string) (node yaml.Node, x bool), binding Binding, locally bool) (interface{}, EvaluationInfo, bool) {
var step yaml.Node
var ok bool
info := DefaultInfo()
debug.Debug("resolving ref [%v]", e.Path)
for i := 0; i < len(e.Path); i++ {
step, ok = f(i, e.Path)
debug.Debug(" %d: %v %+v\n", i, ok, step)
if !ok {
return info.Error("'%s' not found", strings.Join(e.Path[0:i+1], "."))
}
if !isLocallyResolved(step, binding) {
debug.Debug(" locally unresolved %T\n", step.Value())
if _, ok := step.Value().(Expression); ok {
info.Issue = yaml.NewIssue("'%s' unresolved", strings.Join(e.Path[0:i+1], "."))
} else {
info.Issue = yaml.NewIssue("'%s' not complete", strings.Join(e.Path[0:i+1], "."))
}
info.Failed = step.Failed() || step.HasError()
return e, info, true
}
}
if !locally && !isResolvedValue(step.Value(), binding) {
debug.Debug(" unresolved\n")
info.Issue = yaml.NewIssue("'%s' unresolved", e.String())
info.Failed = step.Failed() || step.HasError()
return e, info, true
}
debug.Debug("reference %v -> %+v\n", e.Path, step)
info.KeyName = step.KeyName()
return value(yaml.ReferencedNode(step)), info, true
}
func tagList(list []*TagInfo) string {
s := ""
sep := ""
for _, l := range list {
s = s + sep + l.Name()
sep = ", "
}
return s
}