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Diffstat (limited to '')
-rw-r--r-- | dependencies/pkg/mod/github.com/goccy/go-yaml@v1.9.6/ast/ast.go | 2100 |
1 files changed, 2100 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/goccy/go-yaml@v1.9.6/ast/ast.go b/dependencies/pkg/mod/github.com/goccy/go-yaml@v1.9.6/ast/ast.go new file mode 100644 index 0000000..795f525 --- /dev/null +++ b/dependencies/pkg/mod/github.com/goccy/go-yaml@v1.9.6/ast/ast.go @@ -0,0 +1,2100 @@ +package ast + +import ( + "fmt" + "io" + "math" + "strconv" + "strings" + + "github.com/goccy/go-yaml/token" + "golang.org/x/xerrors" +) + +var ( + ErrInvalidTokenType = xerrors.New("invalid token type") + ErrInvalidAnchorName = xerrors.New("invalid anchor name") + ErrInvalidAliasName = xerrors.New("invalid alias name") +) + +// NodeType type identifier of node +type NodeType int + +const ( + // UnknownNodeType type identifier for default + UnknownNodeType NodeType = iota + // DocumentType type identifier for document node + DocumentType + // NullType type identifier for null node + NullType + // BoolType type identifier for boolean node + BoolType + // IntegerType type identifier for integer node + IntegerType + // FloatType type identifier for float node + FloatType + // InfinityType type identifier for infinity node + InfinityType + // NanType type identifier for nan node + NanType + // StringType type identifier for string node + StringType + // MergeKeyType type identifier for merge key node + MergeKeyType + // LiteralType type identifier for literal node + LiteralType + // MappingType type identifier for mapping node + MappingType + // MappingKeyType type identifier for mapping key node + MappingKeyType + // MappingValueType type identifier for mapping value node + MappingValueType + // SequenceType type identifier for sequence node + SequenceType + // AnchorType type identifier for anchor node + AnchorType + // AliasType type identifier for alias node + AliasType + // DirectiveType type identifier for directive node + DirectiveType + // TagType type identifier for tag node + TagType + // CommentType type identifier for comment node + CommentType + // CommentGroupType type identifier for comment group node + CommentGroupType +) + +// String node type identifier to text +func (t NodeType) String() string { + switch t { + case UnknownNodeType: + return "UnknownNode" + case DocumentType: + return "Document" + case NullType: + return "Null" + case BoolType: + return "Bool" + case IntegerType: + return "Integer" + case FloatType: + return "Float" + case InfinityType: + return "Infinity" + case NanType: + return "Nan" + case StringType: + return "String" + case MergeKeyType: + return "MergeKey" + case LiteralType: + return "Literal" + case MappingType: + return "Mapping" + case MappingKeyType: + return "MappingKey" + case MappingValueType: + return "MappingValue" + case SequenceType: + return "Sequence" + case AnchorType: + return "Anchor" + case AliasType: + return "Alias" + case DirectiveType: + return "Directive" + case TagType: + return "Tag" + case CommentType: + return "Comment" + case CommentGroupType: + return "CommentGroup" + } + return "" +} + +// String node type identifier to YAML Structure name +// based on https://yaml.org/spec/1.2/spec.html +func (t NodeType) YAMLName() string { + switch t { + case UnknownNodeType: + return "unknown" + case DocumentType: + return "document" + case NullType: + return "null" + case BoolType: + return "boolean" + case IntegerType: + return "int" + case FloatType: + return "float" + case InfinityType: + return "inf" + case NanType: + return "nan" + case StringType: + return "string" + case MergeKeyType: + return "merge key" + case LiteralType: + return "scalar" + case MappingType: + return "mapping" + case MappingKeyType: + return "key" + case MappingValueType: + return "value" + case SequenceType: + return "sequence" + case AnchorType: + return "anchor" + case AliasType: + return "alias" + case DirectiveType: + return "directive" + case TagType: + return "tag" + case CommentType: + return "comment" + case CommentGroupType: + return "comment" + } + return "" +} + +// Node type of node +type Node interface { + io.Reader + // String node to text + String() string + // GetToken returns token instance + GetToken() *token.Token + // Type returns type of node + Type() NodeType + // AddColumn add column number to child nodes recursively + AddColumn(int) + // SetComment set comment token to node + SetComment(*CommentGroupNode) error + // Comment returns comment token instance + GetComment() *CommentGroupNode + // GetPath returns YAMLPath for the current node + GetPath() string + // SetPath set YAMLPath for the current node + SetPath(string) + // MarshalYAML + MarshalYAML() ([]byte, error) + // already read length + readLen() int + // append read length + addReadLen(int) + // clean read length + clearLen() +} + +// MapKeyNode type for map key node +type MapKeyNode interface { + Node + // String node to text without comment + stringWithoutComment() string +} + +// ScalarNode type for scalar node +type ScalarNode interface { + MapKeyNode + GetValue() interface{} +} + +type BaseNode struct { + Path string + Comment *CommentGroupNode + read int +} + +func addCommentString(base string, node *CommentGroupNode) string { + return fmt.Sprintf("%s %s", base, node.String()) +} + +func (n *BaseNode) readLen() int { + return n.read +} + +func (n *BaseNode) clearLen() { + n.read = 0 +} + +func (n *BaseNode) addReadLen(len int) { + n.read += len +} + +// GetPath returns YAMLPath for the current node. +func (n *BaseNode) GetPath() string { + if n == nil { + return "" + } + return n.Path +} + +// SetPath set YAMLPath for the current node. +func (n *BaseNode) SetPath(path string) { + if n == nil { + return + } + n.Path = path +} + +// GetComment returns comment token instance +func (n *BaseNode) GetComment() *CommentGroupNode { + return n.Comment +} + +// SetComment set comment token +func (n *BaseNode) SetComment(node *CommentGroupNode) error { + n.Comment = node + return nil +} + +func min(a, b int) int { + if a < b { + return a + } + return b +} + +func readNode(p []byte, node Node) (int, error) { + s := node.String() + readLen := node.readLen() + remain := len(s) - readLen + if remain == 0 { + node.clearLen() + return 0, io.EOF + } + size := min(remain, len(p)) + for idx, b := range []byte(s[readLen : readLen+size]) { + p[idx] = byte(b) + } + node.addReadLen(size) + return size, nil +} + +// Null create node for null value +func Null(tk *token.Token) *NullNode { + return &NullNode{ + BaseNode: &BaseNode{}, + Token: tk, + } +} + +// Bool create node for boolean value +func Bool(tk *token.Token) *BoolNode { + b, _ := strconv.ParseBool(tk.Value) + return &BoolNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: b, + } +} + +// Integer create node for integer value +func Integer(tk *token.Token) *IntegerNode { + value := removeUnderScoreFromNumber(tk.Value) + switch tk.Type { + case token.BinaryIntegerType: + // skip two characters because binary token starts with '0b' + skipCharacterNum := 2 + negativePrefix := "" + if value[0] == '-' { + skipCharacterNum++ + negativePrefix = "-" + } + if len(negativePrefix) > 0 { + i, _ := strconv.ParseInt(negativePrefix+value[skipCharacterNum:], 2, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + } + i, _ := strconv.ParseUint(negativePrefix+value[skipCharacterNum:], 2, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + case token.OctetIntegerType: + // octet token starts with '0o' or '-0o' or '0' or '-0' + skipCharacterNum := 1 + negativePrefix := "" + if value[0] == '-' { + skipCharacterNum++ + if len(value) > 2 && value[2] == 'o' { + skipCharacterNum++ + } + negativePrefix = "-" + } else { + if value[1] == 'o' { + skipCharacterNum++ + } + } + if len(negativePrefix) > 0 { + i, _ := strconv.ParseInt(negativePrefix+value[skipCharacterNum:], 8, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + } + i, _ := strconv.ParseUint(value[skipCharacterNum:], 8, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + case token.HexIntegerType: + // hex token starts with '0x' or '-0x' + skipCharacterNum := 2 + negativePrefix := "" + if value[0] == '-' { + skipCharacterNum++ + negativePrefix = "-" + } + if len(negativePrefix) > 0 { + i, _ := strconv.ParseInt(negativePrefix+value[skipCharacterNum:], 16, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + } + i, _ := strconv.ParseUint(value[skipCharacterNum:], 16, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + } + if value[0] == '-' || value[0] == '+' { + i, _ := strconv.ParseInt(value, 10, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } + } + i, _ := strconv.ParseUint(value, 10, 64) + return &IntegerNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: i, + } +} + +// Float create node for float value +func Float(tk *token.Token) *FloatNode { + f, _ := strconv.ParseFloat(removeUnderScoreFromNumber(tk.Value), 64) + return &FloatNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: f, + } +} + +// Infinity create node for .inf or -.inf value +func Infinity(tk *token.Token) *InfinityNode { + node := &InfinityNode{ + BaseNode: &BaseNode{}, + Token: tk, + } + switch tk.Value { + case ".inf", ".Inf", ".INF": + node.Value = math.Inf(0) + case "-.inf", "-.Inf", "-.INF": + node.Value = math.Inf(-1) + } + return node +} + +// Nan create node for .nan value +func Nan(tk *token.Token) *NanNode { + return &NanNode{ + BaseNode: &BaseNode{}, + Token: tk, + } +} + +// String create node for string value +func String(tk *token.Token) *StringNode { + return &StringNode{ + BaseNode: &BaseNode{}, + Token: tk, + Value: tk.Value, + } +} + +// Comment create node for comment +func Comment(tk *token.Token) *CommentNode { + return &CommentNode{ + BaseNode: &BaseNode{}, + Token: tk, + } +} + +func CommentGroup(comments []*token.Token) *CommentGroupNode { + nodes := []*CommentNode{} + for _, comment := range comments { + nodes = append(nodes, Comment(comment)) + } + return &CommentGroupNode{ + BaseNode: &BaseNode{}, + Comments: nodes, + } +} + +// MergeKey create node for merge key ( << ) +func MergeKey(tk *token.Token) *MergeKeyNode { + return &MergeKeyNode{ + BaseNode: &BaseNode{}, + Token: tk, + } +} + +// Mapping create node for map +func Mapping(tk *token.Token, isFlowStyle bool, values ...*MappingValueNode) *MappingNode { + node := &MappingNode{ + BaseNode: &BaseNode{}, + Start: tk, + IsFlowStyle: isFlowStyle, + Values: []*MappingValueNode{}, + } + node.Values = append(node.Values, values...) + return node +} + +// MappingValue create node for mapping value +func MappingValue(tk *token.Token, key MapKeyNode, value Node) *MappingValueNode { + return &MappingValueNode{ + BaseNode: &BaseNode{}, + Start: tk, + Key: key, + Value: value, + } +} + +// MappingKey create node for map key ( '?' ). +func MappingKey(tk *token.Token) *MappingKeyNode { + return &MappingKeyNode{ + BaseNode: &BaseNode{}, + Start: tk, + } +} + +// Sequence create node for sequence +func Sequence(tk *token.Token, isFlowStyle bool) *SequenceNode { + return &SequenceNode{ + BaseNode: &BaseNode{}, + Start: tk, + IsFlowStyle: isFlowStyle, + Values: []Node{}, + } +} + +func Anchor(tk *token.Token) *AnchorNode { + return &AnchorNode{ + BaseNode: &BaseNode{}, + Start: tk, + } +} + +func Alias(tk *token.Token) *AliasNode { + return &AliasNode{ + BaseNode: &BaseNode{}, + Start: tk, + } +} + +func Document(tk *token.Token, body Node) *DocumentNode { + return &DocumentNode{ + BaseNode: &BaseNode{}, + Start: tk, + Body: body, + } +} + +func Directive(tk *token.Token) *DirectiveNode { + return &DirectiveNode{ + BaseNode: &BaseNode{}, + Start: tk, + } +} + +func Literal(tk *token.Token) *LiteralNode { + return &LiteralNode{ + BaseNode: &BaseNode{}, + Start: tk, + } +} + +func Tag(tk *token.Token) *TagNode { + return &TagNode{ + BaseNode: &BaseNode{}, + Start: tk, + } +} + +// File contains all documents in YAML file +type File struct { + Name string + Docs []*DocumentNode +} + +// Read implements (io.Reader).Read +func (f *File) Read(p []byte) (int, error) { + for _, doc := range f.Docs { + n, err := doc.Read(p) + if err == io.EOF { + continue + } + return n, nil + } + return 0, io.EOF +} + +// String all documents to text +func (f *File) String() string { + docs := []string{} + for _, doc := range f.Docs { + docs = append(docs, doc.String()) + } + return strings.Join(docs, "\n") +} + +// DocumentNode type of Document +type DocumentNode struct { + *BaseNode + Start *token.Token // position of DocumentHeader ( `---` ) + End *token.Token // position of DocumentEnd ( `...` ) + Body Node +} + +// Read implements (io.Reader).Read +func (d *DocumentNode) Read(p []byte) (int, error) { + return readNode(p, d) +} + +// Type returns DocumentNodeType +func (d *DocumentNode) Type() NodeType { return DocumentType } + +// GetToken returns token instance +func (d *DocumentNode) GetToken() *token.Token { + return d.Body.GetToken() +} + +// AddColumn add column number to child nodes recursively +func (d *DocumentNode) AddColumn(col int) { + if d.Body != nil { + d.Body.AddColumn(col) + } +} + +// String document to text +func (d *DocumentNode) String() string { + doc := []string{} + if d.Start != nil { + doc = append(doc, d.Start.Value) + } + doc = append(doc, d.Body.String()) + if d.End != nil { + doc = append(doc, d.End.Value) + } + return strings.Join(doc, "\n") +} + +// MarshalYAML encodes to a YAML text +func (d *DocumentNode) MarshalYAML() ([]byte, error) { + return []byte(d.String()), nil +} + +func removeUnderScoreFromNumber(num string) string { + return strings.ReplaceAll(num, "_", "") +} + +// NullNode type of null node +type NullNode struct { + *BaseNode + Token *token.Token +} + +// Read implements (io.Reader).Read +func (n *NullNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns NullType +func (n *NullNode) Type() NodeType { return NullType } + +// GetToken returns token instance +func (n *NullNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *NullNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns nil value +func (n *NullNode) GetValue() interface{} { + return nil +} + +// String returns `null` text +func (n *NullNode) String() string { + if n.Comment != nil { + return fmt.Sprintf("null %s", n.Comment.String()) + } + return n.stringWithoutComment() +} + +func (n *NullNode) stringWithoutComment() string { + return "null" +} + +// MarshalYAML encodes to a YAML text +func (n *NullNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// IntegerNode type of integer node +type IntegerNode struct { + *BaseNode + Token *token.Token + Value interface{} // int64 or uint64 value +} + +// Read implements (io.Reader).Read +func (n *IntegerNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns IntegerType +func (n *IntegerNode) Type() NodeType { return IntegerType } + +// GetToken returns token instance +func (n *IntegerNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *IntegerNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns int64 value +func (n *IntegerNode) GetValue() interface{} { + return n.Value +} + +// String int64 to text +func (n *IntegerNode) String() string { + if n.Comment != nil { + return addCommentString(n.Token.Value, n.Comment) + } + return n.stringWithoutComment() +} + +func (n *IntegerNode) stringWithoutComment() string { + return n.Token.Value +} + +// MarshalYAML encodes to a YAML text +func (n *IntegerNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// FloatNode type of float node +type FloatNode struct { + *BaseNode + Token *token.Token + Precision int + Value float64 +} + +// Read implements (io.Reader).Read +func (n *FloatNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns FloatType +func (n *FloatNode) Type() NodeType { return FloatType } + +// GetToken returns token instance +func (n *FloatNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *FloatNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns float64 value +func (n *FloatNode) GetValue() interface{} { + return n.Value +} + +// String float64 to text +func (n *FloatNode) String() string { + if n.Comment != nil { + return addCommentString(n.Token.Value, n.Comment) + } + return n.stringWithoutComment() +} + +func (n *FloatNode) stringWithoutComment() string { + return n.Token.Value +} + +// MarshalYAML encodes to a YAML text +func (n *FloatNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// StringNode type of string node +type StringNode struct { + *BaseNode + Token *token.Token + Value string +} + +// Read implements (io.Reader).Read +func (n *StringNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns StringType +func (n *StringNode) Type() NodeType { return StringType } + +// GetToken returns token instance +func (n *StringNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *StringNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns string value +func (n *StringNode) GetValue() interface{} { + return n.Value +} + +// escapeSingleQuote escapes s to a single quoted scalar. +// https://yaml.org/spec/1.2.2/#732-single-quoted-style +func escapeSingleQuote(s string) string { + var sb strings.Builder + growLen := len(s) + // s includes also one ' from the doubled pair + 2 + // opening and closing ' + strings.Count(s, "'") // ' added by ReplaceAll + sb.Grow(growLen) + sb.WriteString("'") + sb.WriteString(strings.ReplaceAll(s, "'", "''")) + sb.WriteString("'") + return sb.String() +} + +// String string value to text with quote or literal header if required +func (n *StringNode) String() string { + switch n.Token.Type { + case token.SingleQuoteType: + quoted := escapeSingleQuote(n.Value) + if n.Comment != nil { + return addCommentString(quoted, n.Comment) + } + return quoted + case token.DoubleQuoteType: + quoted := strconv.Quote(n.Value) + if n.Comment != nil { + return addCommentString(quoted, n.Comment) + } + return quoted + } + + lbc := token.DetectLineBreakCharacter(n.Value) + if strings.Contains(n.Value, lbc) { + // This block assumes that the line breaks in this inside scalar content and the Outside scalar content are the same. + // It works mostly, but inconsistencies occur if line break characters are mixed. + header := token.LiteralBlockHeader(n.Value) + space := strings.Repeat(" ", n.Token.Position.Column-1) + values := []string{} + for _, v := range strings.Split(n.Value, lbc) { + values = append(values, fmt.Sprintf("%s %s", space, v)) + } + block := strings.TrimSuffix(strings.TrimSuffix(strings.Join(values, lbc), fmt.Sprintf("%s %s", lbc, space)), fmt.Sprintf(" %s", space)) + return fmt.Sprintf("%s%s%s", header, lbc, block) + } else if len(n.Value) > 0 && (n.Value[0] == '{' || n.Value[0] == '[') { + return fmt.Sprintf(`'%s'`, n.Value) + } + if n.Comment != nil { + return addCommentString(n.Value, n.Comment) + } + return n.Value +} + +func (n *StringNode) stringWithoutComment() string { + switch n.Token.Type { + case token.SingleQuoteType: + quoted := fmt.Sprintf(`'%s'`, n.Value) + return quoted + case token.DoubleQuoteType: + quoted := strconv.Quote(n.Value) + return quoted + } + + lbc := token.DetectLineBreakCharacter(n.Value) + if strings.Contains(n.Value, lbc) { + // This block assumes that the line breaks in this inside scalar content and the Outside scalar content are the same. + // It works mostly, but inconsistencies occur if line break characters are mixed. + header := token.LiteralBlockHeader(n.Value) + space := strings.Repeat(" ", n.Token.Position.Column-1) + values := []string{} + for _, v := range strings.Split(n.Value, lbc) { + values = append(values, fmt.Sprintf("%s %s", space, v)) + } + block := strings.TrimSuffix(strings.TrimSuffix(strings.Join(values, lbc), fmt.Sprintf("%s %s", lbc, space)), fmt.Sprintf(" %s", space)) + return fmt.Sprintf("%s%s%s", header, lbc, block) + } else if len(n.Value) > 0 && (n.Value[0] == '{' || n.Value[0] == '[') { + return fmt.Sprintf(`'%s'`, n.Value) + } + return n.Value +} + +// MarshalYAML encodes to a YAML text +func (n *StringNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// LiteralNode type of literal node +type LiteralNode struct { + *BaseNode + Start *token.Token + Value *StringNode +} + +// Read implements (io.Reader).Read +func (n *LiteralNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns LiteralType +func (n *LiteralNode) Type() NodeType { return LiteralType } + +// GetToken returns token instance +func (n *LiteralNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *LiteralNode) AddColumn(col int) { + n.Start.AddColumn(col) + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// GetValue returns string value +func (n *LiteralNode) GetValue() interface{} { + return n.String() +} + +// String literal to text +func (n *LiteralNode) String() string { + origin := n.Value.GetToken().Origin + lit := strings.TrimRight(strings.TrimRight(origin, " "), "\n") + if n.Comment != nil { + return fmt.Sprintf("%s %s\n%s", n.Start.Value, n.Comment.String(), lit) + } + return fmt.Sprintf("%s\n%s", n.Start.Value, lit) +} + +func (n *LiteralNode) stringWithoutComment() string { + return n.String() +} + +// MarshalYAML encodes to a YAML text +func (n *LiteralNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// MergeKeyNode type of merge key node +type MergeKeyNode struct { + *BaseNode + Token *token.Token +} + +// Read implements (io.Reader).Read +func (n *MergeKeyNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns MergeKeyType +func (n *MergeKeyNode) Type() NodeType { return MergeKeyType } + +// GetToken returns token instance +func (n *MergeKeyNode) GetToken() *token.Token { + return n.Token +} + +// GetValue returns '<<' value +func (n *MergeKeyNode) GetValue() interface{} { + return n.Token.Value +} + +// String returns '<<' value +func (n *MergeKeyNode) String() string { + return n.stringWithoutComment() +} + +func (n *MergeKeyNode) stringWithoutComment() string { + return n.Token.Value +} + +// AddColumn add column number to child nodes recursively +func (n *MergeKeyNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// MarshalYAML encodes to a YAML text +func (n *MergeKeyNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// BoolNode type of boolean node +type BoolNode struct { + *BaseNode + Token *token.Token + Value bool +} + +// Read implements (io.Reader).Read +func (n *BoolNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns BoolType +func (n *BoolNode) Type() NodeType { return BoolType } + +// GetToken returns token instance +func (n *BoolNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *BoolNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns boolean value +func (n *BoolNode) GetValue() interface{} { + return n.Value +} + +// String boolean to text +func (n *BoolNode) String() string { + if n.Comment != nil { + return addCommentString(n.Token.Value, n.Comment) + } + return n.stringWithoutComment() +} + +func (n *BoolNode) stringWithoutComment() string { + return n.Token.Value +} + +// MarshalYAML encodes to a YAML text +func (n *BoolNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// InfinityNode type of infinity node +type InfinityNode struct { + *BaseNode + Token *token.Token + Value float64 +} + +// Read implements (io.Reader).Read +func (n *InfinityNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns InfinityType +func (n *InfinityNode) Type() NodeType { return InfinityType } + +// GetToken returns token instance +func (n *InfinityNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *InfinityNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns math.Inf(0) or math.Inf(-1) +func (n *InfinityNode) GetValue() interface{} { + return n.Value +} + +// String infinity to text +func (n *InfinityNode) String() string { + if n.Comment != nil { + return addCommentString(n.Token.Value, n.Comment) + } + return n.stringWithoutComment() +} + +func (n *InfinityNode) stringWithoutComment() string { + return n.Token.Value +} + +// MarshalYAML encodes to a YAML text +func (n *InfinityNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// NanNode type of nan node +type NanNode struct { + *BaseNode + Token *token.Token +} + +// Read implements (io.Reader).Read +func (n *NanNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns NanType +func (n *NanNode) Type() NodeType { return NanType } + +// GetToken returns token instance +func (n *NanNode) GetToken() *token.Token { + return n.Token +} + +// AddColumn add column number to child nodes recursively +func (n *NanNode) AddColumn(col int) { + n.Token.AddColumn(col) +} + +// GetValue returns math.NaN() +func (n *NanNode) GetValue() interface{} { + return math.NaN() +} + +// String returns .nan +func (n *NanNode) String() string { + if n.Comment != nil { + return addCommentString(n.Token.Value, n.Comment) + } + return n.stringWithoutComment() +} + +func (n *NanNode) stringWithoutComment() string { + return n.Token.Value +} + +// MarshalYAML encodes to a YAML text +func (n *NanNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// MapNode interface of MappingValueNode / MappingNode +type MapNode interface { + MapRange() *MapNodeIter +} + +// MapNodeIter is an iterator for ranging over a MapNode +type MapNodeIter struct { + values []*MappingValueNode + idx int +} + +const ( + startRangeIndex = -1 +) + +// Next advances the map iterator and reports whether there is another entry. +// It returns false when the iterator is exhausted. +func (m *MapNodeIter) Next() bool { + m.idx++ + next := m.idx < len(m.values) + return next +} + +// Key returns the key of the iterator's current map node entry. +func (m *MapNodeIter) Key() MapKeyNode { + return m.values[m.idx].Key +} + +// Value returns the value of the iterator's current map node entry. +func (m *MapNodeIter) Value() Node { + return m.values[m.idx].Value +} + +// MappingNode type of mapping node +type MappingNode struct { + *BaseNode + Start *token.Token + End *token.Token + IsFlowStyle bool + Values []*MappingValueNode +} + +func (n *MappingNode) startPos() *token.Position { + if len(n.Values) == 0 { + return n.Start.Position + } + return n.Values[0].Key.GetToken().Position +} + +// Merge merge key/value of map. +func (n *MappingNode) Merge(target *MappingNode) { + keyToMapValueMap := map[string]*MappingValueNode{} + for _, value := range n.Values { + key := value.Key.String() + keyToMapValueMap[key] = value + } + column := n.startPos().Column - target.startPos().Column + target.AddColumn(column) + for _, value := range target.Values { + mapValue, exists := keyToMapValueMap[value.Key.String()] + if exists { + mapValue.Value = value.Value + } else { + n.Values = append(n.Values, value) + } + } +} + +// SetIsFlowStyle set value to IsFlowStyle field recursively. +func (n *MappingNode) SetIsFlowStyle(isFlow bool) { + n.IsFlowStyle = isFlow + for _, value := range n.Values { + value.SetIsFlowStyle(isFlow) + } +} + +// Read implements (io.Reader).Read +func (n *MappingNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns MappingType +func (n *MappingNode) Type() NodeType { return MappingType } + +// GetToken returns token instance +func (n *MappingNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *MappingNode) AddColumn(col int) { + n.Start.AddColumn(col) + n.End.AddColumn(col) + for _, value := range n.Values { + value.AddColumn(col) + } +} + +func (n *MappingNode) flowStyleString(commentMode bool) string { + values := []string{} + for _, value := range n.Values { + values = append(values, strings.TrimLeft(value.String(), " ")) + } + mapText := fmt.Sprintf("{%s}", strings.Join(values, ", ")) + if commentMode && n.Comment != nil { + return addCommentString(mapText, n.Comment) + } + return mapText +} + +func (n *MappingNode) blockStyleString(commentMode bool) string { + values := []string{} + for _, value := range n.Values { + values = append(values, value.String()) + } + mapText := strings.Join(values, "\n") + if commentMode && n.Comment != nil { + value := values[0] + var spaceNum int + for i := 0; i < len(value); i++ { + if value[i] != ' ' { + break + } + spaceNum++ + } + comment := n.Comment.StringWithSpace(spaceNum) + return fmt.Sprintf("%s\n%s", comment, mapText) + } + return mapText +} + +// String mapping values to text +func (n *MappingNode) String() string { + if len(n.Values) == 0 { + if n.Comment != nil { + return addCommentString("{}", n.Comment) + } + return "{}" + } + + commentMode := true + if n.IsFlowStyle || len(n.Values) == 0 { + return n.flowStyleString(commentMode) + } + return n.blockStyleString(commentMode) +} + +// MapRange implements MapNode protocol +func (n *MappingNode) MapRange() *MapNodeIter { + return &MapNodeIter{ + idx: startRangeIndex, + values: n.Values, + } +} + +// MarshalYAML encodes to a YAML text +func (n *MappingNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// MappingKeyNode type of tag node +type MappingKeyNode struct { + *BaseNode + Start *token.Token + Value Node +} + +// Read implements (io.Reader).Read +func (n *MappingKeyNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns MappingKeyType +func (n *MappingKeyNode) Type() NodeType { return MappingKeyType } + +// GetToken returns token instance +func (n *MappingKeyNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *MappingKeyNode) AddColumn(col int) { + n.Start.AddColumn(col) + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// String tag to text +func (n *MappingKeyNode) String() string { + return n.stringWithoutComment() +} + +func (n *MappingKeyNode) stringWithoutComment() string { + return fmt.Sprintf("%s %s", n.Start.Value, n.Value.String()) +} + +// MarshalYAML encodes to a YAML text +func (n *MappingKeyNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// MappingValueNode type of mapping value +type MappingValueNode struct { + *BaseNode + Start *token.Token + Key MapKeyNode + Value Node +} + +// Replace replace value node. +func (n *MappingValueNode) Replace(value Node) error { + column := n.Value.GetToken().Position.Column - value.GetToken().Position.Column + value.AddColumn(column) + n.Value = value + return nil +} + +// Read implements (io.Reader).Read +func (n *MappingValueNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns MappingValueType +func (n *MappingValueNode) Type() NodeType { return MappingValueType } + +// GetToken returns token instance +func (n *MappingValueNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *MappingValueNode) AddColumn(col int) { + n.Start.AddColumn(col) + if n.Key != nil { + n.Key.AddColumn(col) + } + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// SetIsFlowStyle set value to IsFlowStyle field recursively. +func (n *MappingValueNode) SetIsFlowStyle(isFlow bool) { + switch value := n.Value.(type) { + case *MappingNode: + value.SetIsFlowStyle(isFlow) + case *MappingValueNode: + value.SetIsFlowStyle(isFlow) + case *SequenceNode: + value.SetIsFlowStyle(isFlow) + } +} + +// String mapping value to text +func (n *MappingValueNode) String() string { + if n.Comment != nil { + return fmt.Sprintf( + "%s\n%s", + n.Comment.StringWithSpace(n.Key.GetToken().Position.Column-1), + n.toString(), + ) + } + return n.toString() +} + +func (n *MappingValueNode) toString() string { + space := strings.Repeat(" ", n.Key.GetToken().Position.Column-1) + keyIndentLevel := n.Key.GetToken().Position.IndentLevel + valueIndentLevel := n.Value.GetToken().Position.IndentLevel + keyComment := n.Key.GetComment() + if _, ok := n.Value.(ScalarNode); ok { + return fmt.Sprintf("%s%s: %s", space, n.Key.String(), n.Value.String()) + } else if keyIndentLevel < valueIndentLevel { + if keyComment != nil { + return fmt.Sprintf( + "%s%s: %s\n%s", + space, + n.Key.stringWithoutComment(), + keyComment.String(), + n.Value.String(), + ) + } + return fmt.Sprintf("%s%s:\n%s", space, n.Key.String(), n.Value.String()) + } else if m, ok := n.Value.(*MappingNode); ok && (m.IsFlowStyle || len(m.Values) == 0) { + return fmt.Sprintf("%s%s: %s", space, n.Key.String(), n.Value.String()) + } else if s, ok := n.Value.(*SequenceNode); ok && (s.IsFlowStyle || len(s.Values) == 0) { + return fmt.Sprintf("%s%s: %s", space, n.Key.String(), n.Value.String()) + } else if _, ok := n.Value.(*AnchorNode); ok { + return fmt.Sprintf("%s%s: %s", space, n.Key.String(), n.Value.String()) + } else if _, ok := n.Value.(*AliasNode); ok { + return fmt.Sprintf("%s%s: %s", space, n.Key.String(), n.Value.String()) + } + if keyComment != nil { + return fmt.Sprintf( + "%s%s: %s\n%s", + space, + n.Key.stringWithoutComment(), + keyComment.String(), + n.Value.String(), + ) + } + if m, ok := n.Value.(*MappingNode); ok && m.Comment != nil { + return fmt.Sprintf( + "%s%s: %s", + space, + n.Key.String(), + strings.TrimLeft(n.Value.String(), " "), + ) + } + return fmt.Sprintf("%s%s:\n%s", space, n.Key.String(), n.Value.String()) +} + +// MapRange implements MapNode protocol +func (n *MappingValueNode) MapRange() *MapNodeIter { + return &MapNodeIter{ + idx: startRangeIndex, + values: []*MappingValueNode{n}, + } +} + +// MarshalYAML encodes to a YAML text +func (n *MappingValueNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// ArrayNode interface of SequenceNode +type ArrayNode interface { + ArrayRange() *ArrayNodeIter +} + +// ArrayNodeIter is an iterator for ranging over a ArrayNode +type ArrayNodeIter struct { + values []Node + idx int +} + +// Next advances the array iterator and reports whether there is another entry. +// It returns false when the iterator is exhausted. +func (m *ArrayNodeIter) Next() bool { + m.idx++ + next := m.idx < len(m.values) + return next +} + +// Value returns the value of the iterator's current array entry. +func (m *ArrayNodeIter) Value() Node { + return m.values[m.idx] +} + +// Len returns length of array +func (m *ArrayNodeIter) Len() int { + return len(m.values) +} + +// SequenceNode type of sequence node +type SequenceNode struct { + *BaseNode + Start *token.Token + End *token.Token + IsFlowStyle bool + Values []Node + ValueComments []*CommentGroupNode +} + +// Replace replace value node. +func (n *SequenceNode) Replace(idx int, value Node) error { + if len(n.Values) <= idx { + return xerrors.Errorf( + "invalid index for sequence: sequence length is %d, but specified %d index", + len(n.Values), idx, + ) + } + column := n.Values[idx].GetToken().Position.Column - value.GetToken().Position.Column + value.AddColumn(column) + n.Values[idx] = value + return nil +} + +// Merge merge sequence value. +func (n *SequenceNode) Merge(target *SequenceNode) { + column := n.Start.Position.Column - target.Start.Position.Column + target.AddColumn(column) + for _, value := range target.Values { + n.Values = append(n.Values, value) + } +} + +// SetIsFlowStyle set value to IsFlowStyle field recursively. +func (n *SequenceNode) SetIsFlowStyle(isFlow bool) { + n.IsFlowStyle = isFlow + for _, value := range n.Values { + switch value := value.(type) { + case *MappingNode: + value.SetIsFlowStyle(isFlow) + case *MappingValueNode: + value.SetIsFlowStyle(isFlow) + case *SequenceNode: + value.SetIsFlowStyle(isFlow) + } + } +} + +// Read implements (io.Reader).Read +func (n *SequenceNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns SequenceType +func (n *SequenceNode) Type() NodeType { return SequenceType } + +// GetToken returns token instance +func (n *SequenceNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *SequenceNode) AddColumn(col int) { + n.Start.AddColumn(col) + n.End.AddColumn(col) + for _, value := range n.Values { + value.AddColumn(col) + } +} + +func (n *SequenceNode) flowStyleString() string { + values := []string{} + for _, value := range n.Values { + values = append(values, value.String()) + } + return fmt.Sprintf("[%s]", strings.Join(values, ", ")) +} + +func (n *SequenceNode) blockStyleString() string { + space := strings.Repeat(" ", n.Start.Position.Column-1) + values := []string{} + if n.Comment != nil { + values = append(values, n.Comment.StringWithSpace(n.Start.Position.Column-1)) + } + + for idx, value := range n.Values { + valueStr := value.String() + splittedValues := strings.Split(valueStr, "\n") + trimmedFirstValue := strings.TrimLeft(splittedValues[0], " ") + diffLength := len(splittedValues[0]) - len(trimmedFirstValue) + if len(splittedValues) > 1 && value.Type() == StringType || value.Type() == LiteralType { + // If multi-line string, the space characters for indent have already been added, so delete them. + for i := 1; i < len(splittedValues); i++ { + splittedValues[i] = strings.TrimLeft(splittedValues[i], " ") + } + } + newValues := []string{trimmedFirstValue} + for i := 1; i < len(splittedValues); i++ { + if len(splittedValues[i]) <= diffLength { + // this line is \n or white space only + newValues = append(newValues, "") + continue + } + trimmed := splittedValues[i][diffLength:] + newValues = append(newValues, fmt.Sprintf("%s %s", space, trimmed)) + } + newValue := strings.Join(newValues, "\n") + if len(n.ValueComments) == len(n.Values) && n.ValueComments[idx] != nil { + values = append(values, n.ValueComments[idx].StringWithSpace(n.Start.Position.Column-1)) + } + values = append(values, fmt.Sprintf("%s- %s", space, newValue)) + } + return strings.Join(values, "\n") +} + +// String sequence to text +func (n *SequenceNode) String() string { + if n.IsFlowStyle || len(n.Values) == 0 { + return n.flowStyleString() + } + return n.blockStyleString() +} + +// ArrayRange implements ArrayNode protocol +func (n *SequenceNode) ArrayRange() *ArrayNodeIter { + return &ArrayNodeIter{ + idx: startRangeIndex, + values: n.Values, + } +} + +// MarshalYAML encodes to a YAML text +func (n *SequenceNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// AnchorNode type of anchor node +type AnchorNode struct { + *BaseNode + Start *token.Token + Name Node + Value Node +} + +func (n *AnchorNode) SetName(name string) error { + if n.Name == nil { + return ErrInvalidAnchorName + } + s, ok := n.Name.(*StringNode) + if !ok { + return ErrInvalidAnchorName + } + s.Value = name + return nil +} + +// Read implements (io.Reader).Read +func (n *AnchorNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns AnchorType +func (n *AnchorNode) Type() NodeType { return AnchorType } + +// GetToken returns token instance +func (n *AnchorNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *AnchorNode) AddColumn(col int) { + n.Start.AddColumn(col) + if n.Name != nil { + n.Name.AddColumn(col) + } + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// String anchor to text +func (n *AnchorNode) String() string { + value := n.Value.String() + if len(strings.Split(value, "\n")) > 1 { + return fmt.Sprintf("&%s\n%s", n.Name.String(), value) + } else if s, ok := n.Value.(*SequenceNode); ok && !s.IsFlowStyle { + return fmt.Sprintf("&%s\n%s", n.Name.String(), value) + } else if m, ok := n.Value.(*MappingNode); ok && !m.IsFlowStyle { + return fmt.Sprintf("&%s\n%s", n.Name.String(), value) + } + return fmt.Sprintf("&%s %s", n.Name.String(), value) +} + +// MarshalYAML encodes to a YAML text +func (n *AnchorNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// AliasNode type of alias node +type AliasNode struct { + *BaseNode + Start *token.Token + Value Node +} + +func (n *AliasNode) SetName(name string) error { + if n.Value == nil { + return ErrInvalidAliasName + } + s, ok := n.Value.(*StringNode) + if !ok { + return ErrInvalidAliasName + } + s.Value = name + return nil +} + +// Read implements (io.Reader).Read +func (n *AliasNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns AliasType +func (n *AliasNode) Type() NodeType { return AliasType } + +// GetToken returns token instance +func (n *AliasNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *AliasNode) AddColumn(col int) { + n.Start.AddColumn(col) + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// String alias to text +func (n *AliasNode) String() string { + return fmt.Sprintf("*%s", n.Value.String()) +} + +// MarshalYAML encodes to a YAML text +func (n *AliasNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// DirectiveNode type of directive node +type DirectiveNode struct { + *BaseNode + Start *token.Token + Value Node +} + +// Read implements (io.Reader).Read +func (n *DirectiveNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns DirectiveType +func (n *DirectiveNode) Type() NodeType { return DirectiveType } + +// GetToken returns token instance +func (n *DirectiveNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *DirectiveNode) AddColumn(col int) { + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// String directive to text +func (n *DirectiveNode) String() string { + return fmt.Sprintf("%s%s", n.Start.Value, n.Value.String()) +} + +// MarshalYAML encodes to a YAML text +func (n *DirectiveNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// TagNode type of tag node +type TagNode struct { + *BaseNode + Start *token.Token + Value Node +} + +// Read implements (io.Reader).Read +func (n *TagNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns TagType +func (n *TagNode) Type() NodeType { return TagType } + +// GetToken returns token instance +func (n *TagNode) GetToken() *token.Token { + return n.Start +} + +// AddColumn add column number to child nodes recursively +func (n *TagNode) AddColumn(col int) { + n.Start.AddColumn(col) + if n.Value != nil { + n.Value.AddColumn(col) + } +} + +// String tag to text +func (n *TagNode) String() string { + return fmt.Sprintf("%s %s", n.Start.Value, n.Value.String()) +} + +// MarshalYAML encodes to a YAML text +func (n *TagNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// CommentNode type of comment node +type CommentNode struct { + *BaseNode + Token *token.Token +} + +// Read implements (io.Reader).Read +func (n *CommentNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns TagType +func (n *CommentNode) Type() NodeType { return CommentType } + +// GetToken returns token instance +func (n *CommentNode) GetToken() *token.Token { return n.Token } + +// AddColumn add column number to child nodes recursively +func (n *CommentNode) AddColumn(col int) { + if n.Token == nil { + return + } + n.Token.AddColumn(col) +} + +// String comment to text +func (n *CommentNode) String() string { + return fmt.Sprintf("#%s", n.Token.Value) +} + +// MarshalYAML encodes to a YAML text +func (n *CommentNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// CommentGroupNode type of comment node +type CommentGroupNode struct { + *BaseNode + Comments []*CommentNode +} + +// Read implements (io.Reader).Read +func (n *CommentGroupNode) Read(p []byte) (int, error) { + return readNode(p, n) +} + +// Type returns TagType +func (n *CommentGroupNode) Type() NodeType { return CommentType } + +// GetToken returns token instance +func (n *CommentGroupNode) GetToken() *token.Token { + if len(n.Comments) > 0 { + return n.Comments[0].Token + } + return nil +} + +// AddColumn add column number to child nodes recursively +func (n *CommentGroupNode) AddColumn(col int) { + for _, comment := range n.Comments { + comment.AddColumn(col) + } +} + +// String comment to text +func (n *CommentGroupNode) String() string { + values := []string{} + for _, comment := range n.Comments { + values = append(values, comment.String()) + } + return strings.Join(values, "\n") +} + +func (n *CommentGroupNode) StringWithSpace(col int) string { + space := strings.Repeat(" ", col) + values := []string{} + for _, comment := range n.Comments { + values = append(values, space+comment.String()) + } + return strings.Join(values, "\n") + +} + +// MarshalYAML encodes to a YAML text +func (n *CommentGroupNode) MarshalYAML() ([]byte, error) { + return []byte(n.String()), nil +} + +// Visitor has Visit method that is invokded for each node encountered by Walk. +// If the result visitor w is not nil, Walk visits each of the children of node with the visitor w, +// followed by a call of w.Visit(nil). +type Visitor interface { + Visit(Node) Visitor +} + +// Walk traverses an AST in depth-first order: It starts by calling v.Visit(node); node must not be nil. +// If the visitor w returned by v.Visit(node) is not nil, +// Walk is invoked recursively with visitor w for each of the non-nil children of node, +// followed by a call of w.Visit(nil). +func Walk(v Visitor, node Node) { + if v = v.Visit(node); v == nil { + return + } + + switch n := node.(type) { + case *CommentNode: + case *NullNode: + walkComment(v, n.BaseNode) + case *IntegerNode: + walkComment(v, n.BaseNode) + case *FloatNode: + walkComment(v, n.BaseNode) + case *StringNode: + walkComment(v, n.BaseNode) + case *MergeKeyNode: + walkComment(v, n.BaseNode) + case *BoolNode: + walkComment(v, n.BaseNode) + case *InfinityNode: + walkComment(v, n.BaseNode) + case *NanNode: + walkComment(v, n.BaseNode) + case *LiteralNode: + walkComment(v, n.BaseNode) + Walk(v, n.Value) + case *DirectiveNode: + walkComment(v, n.BaseNode) + Walk(v, n.Value) + case *TagNode: + walkComment(v, n.BaseNode) + Walk(v, n.Value) + case *DocumentNode: + walkComment(v, n.BaseNode) + Walk(v, n.Body) + case *MappingNode: + walkComment(v, n.BaseNode) + for _, value := range n.Values { + Walk(v, value) + } + case *MappingKeyNode: + walkComment(v, n.BaseNode) + Walk(v, n.Value) + case *MappingValueNode: + walkComment(v, n.BaseNode) + Walk(v, n.Key) + Walk(v, n.Value) + case *SequenceNode: + walkComment(v, n.BaseNode) + for _, value := range n.Values { + Walk(v, value) + } + case *AnchorNode: + walkComment(v, n.BaseNode) + Walk(v, n.Name) + Walk(v, n.Value) + case *AliasNode: + walkComment(v, n.BaseNode) + Walk(v, n.Value) + } +} + +func walkComment(v Visitor, base *BaseNode) { + if base == nil { + return + } + if base.Comment == nil { + return + } + Walk(v, base.Comment) +} + +type filterWalker struct { + typ NodeType + results []Node +} + +func (v *filterWalker) Visit(n Node) Visitor { + if v.typ == n.Type() { + v.results = append(v.results, n) + } + return v +} + +type parentFinder struct { + target Node +} + +func (f *parentFinder) walk(parent, node Node) Node { + if f.target == node { + return parent + } + switch n := node.(type) { + case *CommentNode: + return nil + case *NullNode: + return nil + case *IntegerNode: + return nil + case *FloatNode: + return nil + case *StringNode: + return nil + case *MergeKeyNode: + return nil + case *BoolNode: + return nil + case *InfinityNode: + return nil + case *NanNode: + return nil + case *LiteralNode: + return f.walk(node, n.Value) + case *DirectiveNode: + return f.walk(node, n.Value) + case *TagNode: + return f.walk(node, n.Value) + case *DocumentNode: + return f.walk(node, n.Body) + case *MappingNode: + for _, value := range n.Values { + if found := f.walk(node, value); found != nil { + return found + } + } + case *MappingKeyNode: + return f.walk(node, n.Value) + case *MappingValueNode: + if found := f.walk(node, n.Key); found != nil { + return found + } + return f.walk(node, n.Value) + case *SequenceNode: + for _, value := range n.Values { + if found := f.walk(node, value); found != nil { + return found + } + } + case *AnchorNode: + if found := f.walk(node, n.Name); found != nil { + return found + } + return f.walk(node, n.Value) + case *AliasNode: + return f.walk(node, n.Value) + } + return nil +} + +// Parent get parent node from child node. +func Parent(root, child Node) Node { + finder := &parentFinder{target: child} + return finder.walk(root, root) +} + +// Filter returns a list of nodes that match the given type. +func Filter(typ NodeType, node Node) []Node { + walker := &filterWalker{typ: typ} + Walk(walker, node) + return walker.results +} + +// FilterFile returns a list of nodes that match the given type. +func FilterFile(typ NodeType, file *File) []Node { + results := []Node{} + for _, doc := range file.Docs { + walker := &filterWalker{typ: typ} + Walk(walker, doc) + results = append(results, walker.results...) + } + return results +} + +type ErrInvalidMergeType struct { + dst Node + src Node +} + +func (e *ErrInvalidMergeType) Error() string { + return fmt.Sprintf("cannot merge %s into %s", e.src.Type(), e.dst.Type()) +} + +// Merge merge document, map, sequence node. +func Merge(dst Node, src Node) error { + if doc, ok := src.(*DocumentNode); ok { + src = doc.Body + } + err := &ErrInvalidMergeType{dst: dst, src: src} + switch dst.Type() { + case DocumentType: + node := dst.(*DocumentNode) + return Merge(node.Body, src) + case MappingType: + node := dst.(*MappingNode) + target, ok := src.(*MappingNode) + if !ok { + return err + } + node.Merge(target) + return nil + case SequenceType: + node := dst.(*SequenceNode) + target, ok := src.(*SequenceNode) + if !ok { + return err + } + node.Merge(target) + return nil + } + return err +} |