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helpers.go
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helpers.go
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// Copyright 2017 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package compiler
import (
"fmt"
"regexp"
"sort"
"strconv"
"gopkg.in/yaml.v3"
"github.com/google/gnostic-models/jsonschema"
)
// compiler helper functions, usually called from generated code
// UnpackMap gets a *yaml.Node if possible.
func UnpackMap(in *yaml.Node) (*yaml.Node, bool) {
if in == nil {
return nil, false
}
return in, true
}
// SortedKeysForMap returns the sorted keys of a yamlv2.MapSlice.
func SortedKeysForMap(m *yaml.Node) []string {
keys := make([]string, 0)
if m.Kind == yaml.MappingNode {
for i := 0; i < len(m.Content); i += 2 {
keys = append(keys, m.Content[i].Value)
}
}
sort.Strings(keys)
return keys
}
// MapHasKey returns true if a yamlv2.MapSlice contains a specified key.
func MapHasKey(m *yaml.Node, key string) bool {
if m == nil {
return false
}
if m.Kind == yaml.MappingNode {
for i := 0; i < len(m.Content); i += 2 {
itemKey := m.Content[i].Value
if key == itemKey {
return true
}
}
}
return false
}
// MapValueForKey gets the value of a map value for a specified key.
func MapValueForKey(m *yaml.Node, key string) *yaml.Node {
if m == nil {
return nil
}
if m.Kind == yaml.MappingNode {
for i := 0; i < len(m.Content); i += 2 {
itemKey := m.Content[i].Value
if key == itemKey {
return m.Content[i+1]
}
}
}
return nil
}
// ConvertInterfaceArrayToStringArray converts an array of interfaces to an array of strings, if possible.
func ConvertInterfaceArrayToStringArray(interfaceArray []interface{}) []string {
stringArray := make([]string, 0)
for _, item := range interfaceArray {
v, ok := item.(string)
if ok {
stringArray = append(stringArray, v)
}
}
return stringArray
}
// SequenceNodeForNode returns a node if it is a SequenceNode.
func SequenceNodeForNode(node *yaml.Node) (*yaml.Node, bool) {
if node.Kind != yaml.SequenceNode {
return nil, false
}
return node, true
}
// BoolForScalarNode returns the bool value of a node.
func BoolForScalarNode(node *yaml.Node) (bool, bool) {
if node == nil {
return false, false
}
if node.Kind == yaml.DocumentNode {
return BoolForScalarNode(node.Content[0])
}
if node.Kind != yaml.ScalarNode {
return false, false
}
if node.Tag != "!!bool" {
return false, false
}
v, err := strconv.ParseBool(node.Value)
if err != nil {
return false, false
}
return v, true
}
// IntForScalarNode returns the integer value of a node.
func IntForScalarNode(node *yaml.Node) (int64, bool) {
if node == nil {
return 0, false
}
if node.Kind == yaml.DocumentNode {
return IntForScalarNode(node.Content[0])
}
if node.Kind != yaml.ScalarNode {
return 0, false
}
if node.Tag != "!!int" {
return 0, false
}
v, err := strconv.ParseInt(node.Value, 10, 64)
if err != nil {
return 0, false
}
return v, true
}
// FloatForScalarNode returns the float value of a node.
func FloatForScalarNode(node *yaml.Node) (float64, bool) {
if node == nil {
return 0.0, false
}
if node.Kind == yaml.DocumentNode {
return FloatForScalarNode(node.Content[0])
}
if node.Kind != yaml.ScalarNode {
return 0.0, false
}
if (node.Tag != "!!int") && (node.Tag != "!!float") {
return 0.0, false
}
v, err := strconv.ParseFloat(node.Value, 64)
if err != nil {
return 0.0, false
}
return v, true
}
// StringForScalarNode returns the string value of a node.
func StringForScalarNode(node *yaml.Node) (string, bool) {
if node == nil {
return "", false
}
if node.Kind == yaml.DocumentNode {
return StringForScalarNode(node.Content[0])
}
switch node.Kind {
case yaml.ScalarNode:
switch node.Tag {
case "!!int":
return node.Value, true
case "!!str":
return node.Value, true
case "!!timestamp":
return node.Value, true
case "!!null":
return "", true
default:
return "", false
}
default:
return "", false
}
}
// StringArrayForSequenceNode converts a sequence node to an array of strings, if possible.
func StringArrayForSequenceNode(node *yaml.Node) []string {
stringArray := make([]string, 0)
for _, item := range node.Content {
v, ok := StringForScalarNode(item)
if ok {
stringArray = append(stringArray, v)
}
}
return stringArray
}
// MissingKeysInMap identifies which keys from a list of required keys are not in a map.
func MissingKeysInMap(m *yaml.Node, requiredKeys []string) []string {
missingKeys := make([]string, 0)
for _, k := range requiredKeys {
if !MapHasKey(m, k) {
missingKeys = append(missingKeys, k)
}
}
return missingKeys
}
// InvalidKeysInMap returns keys in a map that don't match a list of allowed keys and patterns.
func InvalidKeysInMap(m *yaml.Node, allowedKeys []string, allowedPatterns []*regexp.Regexp) []string {
invalidKeys := make([]string, 0)
if m == nil || m.Kind != yaml.MappingNode {
return invalidKeys
}
for i := 0; i < len(m.Content); i += 2 {
key := m.Content[i].Value
found := false
// does the key match an allowed key?
for _, allowedKey := range allowedKeys {
if key == allowedKey {
found = true
break
}
}
if !found {
// does the key match an allowed pattern?
for _, allowedPattern := range allowedPatterns {
if allowedPattern.MatchString(key) {
found = true
break
}
}
if !found {
invalidKeys = append(invalidKeys, key)
}
}
}
return invalidKeys
}
// NewNullNode creates a new Null node.
func NewNullNode() *yaml.Node {
node := &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!null",
}
return node
}
// NewMappingNode creates a new Mapping node.
func NewMappingNode() *yaml.Node {
return &yaml.Node{
Kind: yaml.MappingNode,
Content: make([]*yaml.Node, 0),
}
}
// NewSequenceNode creates a new Sequence node.
func NewSequenceNode() *yaml.Node {
node := &yaml.Node{
Kind: yaml.SequenceNode,
Content: make([]*yaml.Node, 0),
}
return node
}
// NewScalarNodeForString creates a new node to hold a string.
func NewScalarNodeForString(s string) *yaml.Node {
return &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!str",
Value: s,
}
}
// NewSequenceNodeForStringArray creates a new node to hold an array of strings.
func NewSequenceNodeForStringArray(strings []string) *yaml.Node {
node := &yaml.Node{
Kind: yaml.SequenceNode,
Content: make([]*yaml.Node, 0),
}
for _, s := range strings {
node.Content = append(node.Content, NewScalarNodeForString(s))
}
return node
}
// NewScalarNodeForBool creates a new node to hold a bool.
func NewScalarNodeForBool(b bool) *yaml.Node {
return &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!bool",
Value: fmt.Sprintf("%t", b),
}
}
// NewScalarNodeForFloat creates a new node to hold a float.
func NewScalarNodeForFloat(f float64) *yaml.Node {
return &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!float",
Value: fmt.Sprintf("%g", f),
}
}
// NewScalarNodeForInt creates a new node to hold an integer.
func NewScalarNodeForInt(i int64) *yaml.Node {
return &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!int",
Value: fmt.Sprintf("%d", i),
}
}
// PluralProperties returns the string "properties" pluralized.
func PluralProperties(count int) string {
if count == 1 {
return "property"
}
return "properties"
}
// StringArrayContainsValue returns true if a string array contains a specified value.
func StringArrayContainsValue(array []string, value string) bool {
for _, item := range array {
if item == value {
return true
}
}
return false
}
// StringArrayContainsValues returns true if a string array contains all of a list of specified values.
func StringArrayContainsValues(array []string, values []string) bool {
for _, value := range values {
if !StringArrayContainsValue(array, value) {
return false
}
}
return true
}
// StringValue returns the string value of an item.
func StringValue(item interface{}) (value string, ok bool) {
value, ok = item.(string)
if ok {
return value, ok
}
intValue, ok := item.(int)
if ok {
return strconv.Itoa(intValue), true
}
return "", false
}
// Description returns a human-readable represention of an item.
func Description(item interface{}) string {
value, ok := item.(*yaml.Node)
if ok {
return jsonschema.Render(value)
}
return fmt.Sprintf("%+v", item)
}
// Display returns a description of a node for use in error messages.
func Display(node *yaml.Node) string {
switch node.Kind {
case yaml.ScalarNode:
switch node.Tag {
case "!!str":
return fmt.Sprintf("%s (string)", node.Value)
}
}
return fmt.Sprintf("%+v (%T)", node, node)
}
// Marshal creates a yaml version of a structure in our preferred style
func Marshal(in *yaml.Node) []byte {
clearStyle(in)
//bytes, _ := yaml.Marshal(&yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{in}})
bytes, _ := yaml.Marshal(in)
return bytes
}
func clearStyle(node *yaml.Node) {
node.Style = 0
for _, c := range node.Content {
clearStyle(c)
}
}