Golang yaml.Node類代碼示例

/*
 * compatibility issue. A single merge node was always optional
 * means: <<: (( merge )) == <<: (( merge || nil ))
 * the first pass, just parses the dynaml
 * only the second pass, evaluates a dynaml node!
 */
func simpleMergeCompatibilityCheck(initial bool, node yaml.Node) bool {
	if !initial {
		merge, ok := node.Value().(dynaml.MergeExpr)
		return ok && !merge.Required
	}
	return false
}

func isExpression(node yaml.Node) bool {
	if node == nil {
		return false
	}
	_, ok := node.Value().(Expression)
	return ok
}

func ProcessKeyTag(val yaml.Node) (yaml.Node, string) {
	keyName := ""

	m, ok := val.Value().(map[string]yaml.Node)
	if ok {
		found := false
		for key, _ := range m {
			split := strings.Index(key, ":")
			if split > 0 {
				if key[:split] == "key" {
					keyName = key[split+1:]
					found = true
				}
			}
		}
		if found {
			newMap := make(map[string]yaml.Node)
			for key, v := range m {
				split := strings.Index(key, ":")
				if split > 0 {
					if key[:split] == "key" {
						key = key[split+1:]
					}
				}
				newMap[key] = v
			}
			return yaml.SubstituteNode(newMap, val), keyName
		}
	}
	return val, keyName
}

func flow(root yaml.Node, env Environment, shouldOverride bool) yaml.Node {
	if root == nil {
		return root
	}

	switch val := root.Value().(type) {
	case map[string]yaml.Node:
		return flowMap(root, env)

	case []yaml.Node:
		return flowList(root, env)

	case dynaml.Expression:
		result, ok := val.Evaluate(env)
		if !ok {
			return root
		}

		return result
	}

	if shouldOverride {
		overridden, found := env.FindInStubs(env.Path)
		if found {
			return overridden
		}
	}

	_, ok := root.Value().(string)
	if ok {
		return flowString(root, env)
	}

	return root
}

func flowMap(root yaml.Node, env Environment) yaml.Node {
	rootMap := root.Value().(map[string]yaml.Node)

	env = env.WithScope(rootMap)

	newMap := make(map[string]yaml.Node)

	for key, val := range rootMap {
		if key == "<<" {
			base := flow(val, env, true)
			baseMap, ok := base.Value().(map[string]yaml.Node)
			if ok {
				for k, v := range baseMap {
					newMap[k] = v
				}
			}

			continue
		}

		newMap[key] = flow(val, env.WithPath(key), true)
	}

	return yaml.NewNode(newMap, root.SourceName())
}

func flowList(root yaml.Node, env Environment) yaml.Node {
	rootList := root.Value().([]yaml.Node)

	debug.Debug("HANDLE LIST %v\n", env.Path)
	merged, process, replaced, redirectPath, keyName := processMerges(root, rootList, env)

	if process {

		newList := []yaml.Node{}
		if len(redirectPath) > 0 {
			env = env.RedirectOverwrite(redirectPath)
		}
		for idx, val := range merged {
			step := stepName(idx, val, keyName)
			debug.Debug("  step %s\n", step)
			newList = append(newList, flow(val, env.WithPath(step), false))
		}

		merged = newList
	}

	if keyName != "" {
		root = yaml.KeyNameNode(root, keyName)
	}
	debug.Debug("LIST DONE (%s)%v\n", root.KeyName(), env.Path)
	if replaced {
		return yaml.ReplaceNode(merged, root, redirectPath)
	}
	if len(redirectPath) > 0 {
		return yaml.RedirectNode(merged, root, redirectPath)
	}
	return yaml.SubstituteNode(merged, root)
}

func flowMap(root yaml.Node, env Environment) yaml.Node {
	rootMap := root.Value().(map[string]yaml.Node)

	env = env.WithScope(rootMap)

	newMap := make(map[string]yaml.Node)

	sortedKeys := getSortedKeys(rootMap)

	// iteration order matters for the "<<" operator, it must be the first key in the map that is handled
	for i := range sortedKeys {
		key := sortedKeys[i]
		val := rootMap[key]

		if key == "<<" {
			base := flow(val, env, true)
			baseMap, ok := base.Value().(map[string]yaml.Node)
			if ok {
				for k, v := range baseMap {
					newMap[k] = v
				}
			}

			continue
		}

		newMap[key] = flow(val, env.WithPath(key), true)
	}

	return yaml.NewNode(newMap, root.SourceName())
}

func isResolved(node yaml.Node) bool {
	if node == nil {
		return true
	}
	switch node.Value().(type) {
	case Expression:
		return false
	case []yaml.Node:
		for _, n := range node.Value().([]yaml.Node) {
			if !isResolved(n) {
				return false
			}
		}
		return true
	case map[string]yaml.Node:
		for _, n := range node.Value().(map[string]yaml.Node) {
			if !isResolved(n) {
				return false
			}
		}
		return true

	case string:
		if yaml.EmbeddedDynaml(node) != nil {
			return false
		}
		return true
	default:
		return true
	}
}

func FindUnresolvedNodes(root yaml.Node, context ...string) (nodes []UnresolvedNode) {
	if root == nil {
		return nodes
	}

	switch val := root.Value().(type) {
	case map[string]yaml.Node:
		for key, val := range val {
			nodes = append(
				nodes,
				FindUnresolvedNodes(val, addContext(context, key)...)...,
			)
		}

	case []yaml.Node:
		for i, val := range val {
			context := addContext(context, fmt.Sprintf("[%d]", i))

			nodes = append(
				nodes,
				FindUnresolvedNodes(val, context...)...,
			)
		}

	case Expression:
		var path []string
		switch val := root.Value().(type) {
		case AutoExpr:
			path = val.Path
		case MergeExpr:
			path = val.Path
		}

		nodes = append(nodes, UnresolvedNode{
			Node:    root,
			Context: context,
			Path:    path,
		})

	case string:
		if yaml.EmbeddedDynaml(root) != nil {
			nodes = append(nodes, UnresolvedNode{
				Node:    yaml.IssueNode(root, "unparseable expression"),
				Context: context,
				Path:    []string{},
			})
		}
	}

	return nodes
}

func flowList(root yaml.Node, env Environment) yaml.Node {
	rootList := root.Value().([]yaml.Node)

	merged := processMerges(rootList, env)

	newList := []yaml.Node{}

	for idx, val := range merged {
		step := stepName(idx, val)
		newList = append(newList, flow(val, env.WithPath(step), false))
	}

	return yaml.NewNode(newList, root.SourceName())
}

func flowString(root yaml.Node, env Environment) yaml.Node {
	rootString := root.Value().(string)

	sub := embeddedDynaml.FindStringSubmatch(rootString)
	if sub == nil {
		return root
	}

	expr, err := dynaml.Parse(sub[1], env.Path)
	if err != nil {
		return root
	}

	return yaml.NewNode(expr, root.SourceName())
}

func findUnresolvedNodes(root yaml.Node, context ...string) (nodes []UnresolvedNode) {
	if root == nil {
		return nodes
	}

	switch val := root.Value().(type) {
	case map[string]yaml.Node:
		for key, val := range val {
			nodes = append(
				nodes,
				findUnresolvedNodes(val, addContext(context, key)...)...,
			)
		}

	case []yaml.Node:
		for i, val := range val {
			context := addContext(context, fmt.Sprintf("[%d]", i))

			nodes = append(
				nodes,
				findUnresolvedNodes(val, context...)...,
			)
		}

	case dynaml.Expression:
		nodes = append(nodes, UnresolvedNode{
			Node:    root,
			Context: context,
		})
	}

	return nodes
}

func compare(a, b yaml.Node, path []string) []Diff {
	mismatch := Diff{A: a, B: b, Path: path}

	switch av := a.Value().(type) {
	case map[string]yaml.Node:
		switch bv := b.Value().(type) {
		case map[string]yaml.Node:
			return compareMap(av, bv, path)

		case []yaml.Node:
			toMap := listToMap(bv)

			if toMap != nil {
				return compareMap(av, toMap, path)
			} else {
				return []Diff{mismatch}
			}

		default:
			return []Diff{mismatch}
		}

	case []yaml.Node:
		switch bv := b.Value().(type) {
		case []yaml.Node:
			return compareList(av, bv, path)
		default:
			return []Diff{mismatch}
		}

	default:
		atype := reflect.TypeOf(a)
		btype := reflect.TypeOf(b)

		if atype != btype {
			return []Diff{mismatch}
		}

		if av != b.Value() {
			return []Diff{Diff{A: a, B: b, Path: path}}
		}
	}

	return []Diff{}
}

func processMerges(orig yaml.Node, root []yaml.Node, env Environment) ([]yaml.Node, bool, bool, []string, string) {
	spliced := []yaml.Node{}
	process := true
	keyName := orig.KeyName()
	replaced := orig.ReplaceFlag()
	redirectPath := orig.RedirectPath()

	for _, val := range root {
		if val == nil {
			continue
		}

		inlineNode, ok := yaml.UnresolvedListEntryMerge(val)
		if ok {
			debug.Debug("*** %+v\n", inlineNode.Value())
			_, initial := inlineNode.Value().(string)
			result := flow(inlineNode, env, false)
			if result.KeyName() != "" {
				keyName = result.KeyName()
			}
			debug.Debug("=== (%s)%+v\n", keyName, result)
			_, ok := result.Value().(dynaml.Expression)
			if ok {
				if simpleMergeCompatibilityCheck(initial, inlineNode) {
					continue
				}
				newMap := make(map[string]yaml.Node)
				newMap["<<"] = result
				val = yaml.SubstituteNode(newMap, orig)
				process = false
			} else {
				inline, ok := result.Value().([]yaml.Node)

				if ok {
					inlineNew := newEntries(inline, root, keyName)
					replaced = result.ReplaceFlag()
					redirectPath = result.RedirectPath()
					if replaced {
						spliced = inlineNew
						process = false
						break
					} else {
						spliced = append(spliced, inlineNew...)
					}
				}
				continue
			}
		}

		val, newKey := ProcessKeyTag(val)
		if newKey != "" {
			keyName = newKey
		}
		spliced = append(spliced, val)
	}

	debug.Debug("--> %+v  proc=%v replaced=%v redirect=%v key=%s\n", spliced, process, replaced, redirectPath, keyName)
	return spliced, process, replaced, redirectPath, keyName
}

func isLocallyResolved(node yaml.Node) bool {
	switch v := node.Value().(type) {
	case Expression:
		return false
	case map[string]yaml.Node:
		if !yaml.IsMapResolved(v) {
			return false
		}
	case []yaml.Node:
		if !yaml.IsListResolved(v) {
			return false
		}
	default:
	}

	return true
}