686 lines
15 KiB
Go
686 lines
15 KiB
Go
package yaml
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import (
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"encoding"
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"encoding/base64"
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"fmt"
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"math"
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"reflect"
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"strconv"
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"time"
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)
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const (
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documentNode = 1 << iota
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mappingNode
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sequenceNode
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scalarNode
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aliasNode
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)
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type node struct {
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kind int
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line, column int
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tag string
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value string
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implicit bool
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children []*node
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anchors map[string]*node
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}
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// ----------------------------------------------------------------------------
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// Parser, produces a node tree out of a libyaml event stream.
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type parser struct {
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parser yaml_parser_t
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event yaml_event_t
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doc *node
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}
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func newParser(b []byte) *parser {
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p := parser{}
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if !yaml_parser_initialize(&p.parser) {
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panic("failed to initialize YAML emitter")
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}
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if len(b) == 0 {
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b = []byte{'\n'}
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}
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yaml_parser_set_input_string(&p.parser, b)
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p.skip()
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if p.event.typ != yaml_STREAM_START_EVENT {
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panic("expected stream start event, got " + strconv.Itoa(int(p.event.typ)))
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}
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p.skip()
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return &p
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}
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func (p *parser) destroy() {
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if p.event.typ != yaml_NO_EVENT {
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yaml_event_delete(&p.event)
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}
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yaml_parser_delete(&p.parser)
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}
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func (p *parser) skip() {
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if p.event.typ != yaml_NO_EVENT {
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if p.event.typ == yaml_STREAM_END_EVENT {
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failf("attempted to go past the end of stream; corrupted value?")
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}
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yaml_event_delete(&p.event)
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}
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if !yaml_parser_parse(&p.parser, &p.event) {
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p.fail()
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}
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}
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func (p *parser) fail() {
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var where string
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var line int
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if p.parser.problem_mark.line != 0 {
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line = p.parser.problem_mark.line
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} else if p.parser.context_mark.line != 0 {
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line = p.parser.context_mark.line
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}
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if line != 0 {
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where = "line " + strconv.Itoa(line) + ": "
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}
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var msg string
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if len(p.parser.problem) > 0 {
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msg = p.parser.problem
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} else {
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msg = "unknown problem parsing YAML content"
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}
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failf("%s%s", where, msg)
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}
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func (p *parser) anchor(n *node, anchor []byte) {
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if anchor != nil {
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p.doc.anchors[string(anchor)] = n
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}
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}
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func (p *parser) parse() *node {
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switch p.event.typ {
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case yaml_SCALAR_EVENT:
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return p.scalar()
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case yaml_ALIAS_EVENT:
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return p.alias()
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case yaml_MAPPING_START_EVENT:
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return p.mapping()
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case yaml_SEQUENCE_START_EVENT:
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return p.sequence()
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case yaml_DOCUMENT_START_EVENT:
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return p.document()
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case yaml_STREAM_END_EVENT:
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// Happens when attempting to decode an empty buffer.
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return nil
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default:
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panic("attempted to parse unknown event: " + strconv.Itoa(int(p.event.typ)))
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}
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}
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func (p *parser) node(kind int) *node {
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return &node{
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kind: kind,
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line: p.event.start_mark.line,
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column: p.event.start_mark.column,
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}
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}
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func (p *parser) document() *node {
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n := p.node(documentNode)
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n.anchors = make(map[string]*node)
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p.doc = n
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p.skip()
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n.children = append(n.children, p.parse())
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if p.event.typ != yaml_DOCUMENT_END_EVENT {
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panic("expected end of document event but got " + strconv.Itoa(int(p.event.typ)))
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}
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p.skip()
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return n
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}
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func (p *parser) alias() *node {
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n := p.node(aliasNode)
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n.value = string(p.event.anchor)
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p.skip()
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return n
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}
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func (p *parser) scalar() *node {
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n := p.node(scalarNode)
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n.value = string(p.event.value)
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n.tag = string(p.event.tag)
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n.implicit = p.event.implicit
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p.anchor(n, p.event.anchor)
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p.skip()
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return n
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}
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func (p *parser) sequence() *node {
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n := p.node(sequenceNode)
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p.anchor(n, p.event.anchor)
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p.skip()
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for p.event.typ != yaml_SEQUENCE_END_EVENT {
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n.children = append(n.children, p.parse())
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}
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p.skip()
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return n
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}
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func (p *parser) mapping() *node {
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n := p.node(mappingNode)
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p.anchor(n, p.event.anchor)
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p.skip()
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for p.event.typ != yaml_MAPPING_END_EVENT {
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n.children = append(n.children, p.parse(), p.parse())
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}
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p.skip()
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return n
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}
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// ----------------------------------------------------------------------------
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// Decoder, unmarshals a node into a provided value.
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type decoder struct {
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doc *node
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aliases map[string]bool
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mapType reflect.Type
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terrors []string
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strict bool
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}
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var (
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mapItemType = reflect.TypeOf(MapItem{})
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durationType = reflect.TypeOf(time.Duration(0))
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defaultMapType = reflect.TypeOf(map[interface{}]interface{}{})
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ifaceType = defaultMapType.Elem()
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)
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func newDecoder(strict bool) *decoder {
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d := &decoder{mapType: defaultMapType, strict: strict}
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d.aliases = make(map[string]bool)
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return d
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}
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func (d *decoder) terror(n *node, tag string, out reflect.Value) {
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if n.tag != "" {
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tag = n.tag
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}
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value := n.value
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if tag != yaml_SEQ_TAG && tag != yaml_MAP_TAG {
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if len(value) > 10 {
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value = " `" + value[:7] + "...`"
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} else {
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value = " `" + value + "`"
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}
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}
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d.terrors = append(d.terrors, fmt.Sprintf("line %d: cannot unmarshal %s%s into %s", n.line+1, shortTag(tag), value, out.Type()))
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}
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func (d *decoder) callUnmarshaler(n *node, u Unmarshaler) (good bool) {
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terrlen := len(d.terrors)
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err := u.UnmarshalYAML(func(v interface{}) (err error) {
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defer handleErr(&err)
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d.unmarshal(n, reflect.ValueOf(v))
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if len(d.terrors) > terrlen {
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issues := d.terrors[terrlen:]
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d.terrors = d.terrors[:terrlen]
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return &TypeError{issues}
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}
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return nil
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})
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if e, ok := err.(*TypeError); ok {
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d.terrors = append(d.terrors, e.Errors...)
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return false
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}
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if err != nil {
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fail(err)
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}
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return true
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}
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// d.prepare initializes and dereferences pointers and calls UnmarshalYAML
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// if a value is found to implement it.
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// It returns the initialized and dereferenced out value, whether
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// unmarshalling was already done by UnmarshalYAML, and if so whether
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// its types unmarshalled appropriately.
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//
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// If n holds a null value, prepare returns before doing anything.
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func (d *decoder) prepare(n *node, out reflect.Value) (newout reflect.Value, unmarshaled, good bool) {
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if n.tag == yaml_NULL_TAG || n.kind == scalarNode && n.tag == "" && (n.value == "null" || n.value == "~" || n.value == "" && n.implicit) {
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return out, false, false
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}
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again := true
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for again {
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again = false
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if out.Kind() == reflect.Ptr {
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if out.IsNil() {
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out.Set(reflect.New(out.Type().Elem()))
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}
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out = out.Elem()
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again = true
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}
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if out.CanAddr() {
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if u, ok := out.Addr().Interface().(Unmarshaler); ok {
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good = d.callUnmarshaler(n, u)
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return out, true, good
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}
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}
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}
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return out, false, false
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}
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func (d *decoder) unmarshal(n *node, out reflect.Value) (good bool) {
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switch n.kind {
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case documentNode:
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return d.document(n, out)
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case aliasNode:
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return d.alias(n, out)
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}
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out, unmarshaled, good := d.prepare(n, out)
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if unmarshaled {
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return good
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}
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switch n.kind {
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case scalarNode:
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good = d.scalar(n, out)
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case mappingNode:
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good = d.mapping(n, out)
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case sequenceNode:
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good = d.sequence(n, out)
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default:
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panic("internal error: unknown node kind: " + strconv.Itoa(n.kind))
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}
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return good
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}
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func (d *decoder) document(n *node, out reflect.Value) (good bool) {
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if len(n.children) == 1 {
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d.doc = n
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d.unmarshal(n.children[0], out)
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return true
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}
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return false
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}
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func (d *decoder) alias(n *node, out reflect.Value) (good bool) {
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an, ok := d.doc.anchors[n.value]
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if !ok {
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failf("unknown anchor '%s' referenced", n.value)
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}
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if d.aliases[n.value] {
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failf("anchor '%s' value contains itself", n.value)
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}
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d.aliases[n.value] = true
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good = d.unmarshal(an, out)
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delete(d.aliases, n.value)
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return good
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}
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var zeroValue reflect.Value
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func resetMap(out reflect.Value) {
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for _, k := range out.MapKeys() {
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out.SetMapIndex(k, zeroValue)
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}
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}
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func (d *decoder) scalar(n *node, out reflect.Value) (good bool) {
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var tag string
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var resolved interface{}
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if n.tag == "" && !n.implicit {
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tag = yaml_STR_TAG
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resolved = n.value
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} else {
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tag, resolved = resolve(n.tag, n.value)
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if tag == yaml_BINARY_TAG {
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data, err := base64.StdEncoding.DecodeString(resolved.(string))
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if err != nil {
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failf("!!binary value contains invalid base64 data")
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}
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resolved = string(data)
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}
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}
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if resolved == nil {
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if out.Kind() == reflect.Map && !out.CanAddr() {
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resetMap(out)
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} else {
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out.Set(reflect.Zero(out.Type()))
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}
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return true
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}
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if s, ok := resolved.(string); ok && out.CanAddr() {
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if u, ok := out.Addr().Interface().(encoding.TextUnmarshaler); ok {
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err := u.UnmarshalText([]byte(s))
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if err != nil {
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fail(err)
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}
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return true
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}
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}
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switch out.Kind() {
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case reflect.String:
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if tag == yaml_BINARY_TAG {
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out.SetString(resolved.(string))
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good = true
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} else if resolved != nil {
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out.SetString(n.value)
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good = true
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}
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case reflect.Interface:
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if resolved == nil {
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out.Set(reflect.Zero(out.Type()))
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} else {
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out.Set(reflect.ValueOf(resolved))
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}
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good = true
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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switch resolved := resolved.(type) {
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case int:
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if !out.OverflowInt(int64(resolved)) {
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out.SetInt(int64(resolved))
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good = true
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}
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case int64:
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if !out.OverflowInt(resolved) {
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out.SetInt(resolved)
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good = true
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}
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case uint64:
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if resolved <= math.MaxInt64 && !out.OverflowInt(int64(resolved)) {
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out.SetInt(int64(resolved))
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good = true
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}
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case float64:
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if resolved <= math.MaxInt64 && !out.OverflowInt(int64(resolved)) {
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out.SetInt(int64(resolved))
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good = true
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}
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case string:
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if out.Type() == durationType {
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d, err := time.ParseDuration(resolved)
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if err == nil {
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out.SetInt(int64(d))
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good = true
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}
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}
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}
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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switch resolved := resolved.(type) {
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case int:
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if resolved >= 0 && !out.OverflowUint(uint64(resolved)) {
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out.SetUint(uint64(resolved))
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good = true
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}
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case int64:
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if resolved >= 0 && !out.OverflowUint(uint64(resolved)) {
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out.SetUint(uint64(resolved))
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good = true
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}
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case uint64:
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if !out.OverflowUint(uint64(resolved)) {
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out.SetUint(uint64(resolved))
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good = true
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}
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case float64:
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if resolved <= math.MaxUint64 && !out.OverflowUint(uint64(resolved)) {
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out.SetUint(uint64(resolved))
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good = true
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}
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}
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case reflect.Bool:
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switch resolved := resolved.(type) {
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case bool:
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out.SetBool(resolved)
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good = true
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}
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case reflect.Float32, reflect.Float64:
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switch resolved := resolved.(type) {
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case int:
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out.SetFloat(float64(resolved))
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good = true
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case int64:
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out.SetFloat(float64(resolved))
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good = true
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case uint64:
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out.SetFloat(float64(resolved))
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good = true
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case float64:
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out.SetFloat(resolved)
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good = true
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}
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case reflect.Ptr:
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if out.Type().Elem() == reflect.TypeOf(resolved) {
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// TODO DOes this make sense? When is out a Ptr except when decoding a nil value?
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elem := reflect.New(out.Type().Elem())
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elem.Elem().Set(reflect.ValueOf(resolved))
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out.Set(elem)
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good = true
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}
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}
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if !good {
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d.terror(n, tag, out)
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}
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return good
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}
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func settableValueOf(i interface{}) reflect.Value {
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v := reflect.ValueOf(i)
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sv := reflect.New(v.Type()).Elem()
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sv.Set(v)
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return sv
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}
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func (d *decoder) sequence(n *node, out reflect.Value) (good bool) {
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l := len(n.children)
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var iface reflect.Value
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switch out.Kind() {
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case reflect.Slice:
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out.Set(reflect.MakeSlice(out.Type(), l, l))
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case reflect.Interface:
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// No type hints. Will have to use a generic sequence.
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iface = out
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out = settableValueOf(make([]interface{}, l))
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default:
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d.terror(n, yaml_SEQ_TAG, out)
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return false
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}
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et := out.Type().Elem()
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j := 0
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for i := 0; i < l; i++ {
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e := reflect.New(et).Elem()
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if ok := d.unmarshal(n.children[i], e); ok {
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out.Index(j).Set(e)
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j++
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}
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}
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out.Set(out.Slice(0, j))
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if iface.IsValid() {
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iface.Set(out)
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}
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return true
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}
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func (d *decoder) mapping(n *node, out reflect.Value) (good bool) {
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switch out.Kind() {
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case reflect.Struct:
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return d.mappingStruct(n, out)
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case reflect.Slice:
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return d.mappingSlice(n, out)
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case reflect.Map:
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// okay
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case reflect.Interface:
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if d.mapType.Kind() == reflect.Map {
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iface := out
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out = reflect.MakeMap(d.mapType)
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iface.Set(out)
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} else {
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slicev := reflect.New(d.mapType).Elem()
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if !d.mappingSlice(n, slicev) {
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return false
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}
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out.Set(slicev)
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return true
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}
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default:
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d.terror(n, yaml_MAP_TAG, out)
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return false
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}
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outt := out.Type()
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kt := outt.Key()
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et := outt.Elem()
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mapType := d.mapType
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if outt.Key() == ifaceType && outt.Elem() == ifaceType {
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d.mapType = outt
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}
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if out.IsNil() {
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out.Set(reflect.MakeMap(outt))
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}
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l := len(n.children)
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for i := 0; i < l; i += 2 {
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if isMerge(n.children[i]) {
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d.merge(n.children[i+1], out)
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continue
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}
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k := reflect.New(kt).Elem()
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if d.unmarshal(n.children[i], k) {
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kkind := k.Kind()
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if kkind == reflect.Interface {
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kkind = k.Elem().Kind()
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}
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if kkind == reflect.Map || kkind == reflect.Slice {
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failf("invalid map key: %#v", k.Interface())
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}
|
|
e := reflect.New(et).Elem()
|
|
if d.unmarshal(n.children[i+1], e) {
|
|
out.SetMapIndex(k, e)
|
|
}
|
|
}
|
|
}
|
|
d.mapType = mapType
|
|
return true
|
|
}
|
|
|
|
func (d *decoder) mappingSlice(n *node, out reflect.Value) (good bool) {
|
|
outt := out.Type()
|
|
if outt.Elem() != mapItemType {
|
|
d.terror(n, yaml_MAP_TAG, out)
|
|
return false
|
|
}
|
|
|
|
mapType := d.mapType
|
|
d.mapType = outt
|
|
|
|
var slice []MapItem
|
|
var l = len(n.children)
|
|
for i := 0; i < l; i += 2 {
|
|
if isMerge(n.children[i]) {
|
|
d.merge(n.children[i+1], out)
|
|
continue
|
|
}
|
|
item := MapItem{}
|
|
k := reflect.ValueOf(&item.Key).Elem()
|
|
if d.unmarshal(n.children[i], k) {
|
|
v := reflect.ValueOf(&item.Value).Elem()
|
|
if d.unmarshal(n.children[i+1], v) {
|
|
slice = append(slice, item)
|
|
}
|
|
}
|
|
}
|
|
out.Set(reflect.ValueOf(slice))
|
|
d.mapType = mapType
|
|
return true
|
|
}
|
|
|
|
func (d *decoder) mappingStruct(n *node, out reflect.Value) (good bool) {
|
|
sinfo, err := getStructInfo(out.Type())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
name := settableValueOf("")
|
|
l := len(n.children)
|
|
|
|
var inlineMap reflect.Value
|
|
var elemType reflect.Type
|
|
if sinfo.InlineMap != -1 {
|
|
inlineMap = out.Field(sinfo.InlineMap)
|
|
inlineMap.Set(reflect.New(inlineMap.Type()).Elem())
|
|
elemType = inlineMap.Type().Elem()
|
|
}
|
|
|
|
for i := 0; i < l; i += 2 {
|
|
ni := n.children[i]
|
|
if isMerge(ni) {
|
|
d.merge(n.children[i+1], out)
|
|
continue
|
|
}
|
|
if !d.unmarshal(ni, name) {
|
|
continue
|
|
}
|
|
if info, ok := sinfo.FieldsMap[name.String()]; ok {
|
|
var field reflect.Value
|
|
if info.Inline == nil {
|
|
field = out.Field(info.Num)
|
|
} else {
|
|
field = out.FieldByIndex(info.Inline)
|
|
}
|
|
d.unmarshal(n.children[i+1], field)
|
|
} else if sinfo.InlineMap != -1 {
|
|
if inlineMap.IsNil() {
|
|
inlineMap.Set(reflect.MakeMap(inlineMap.Type()))
|
|
}
|
|
value := reflect.New(elemType).Elem()
|
|
d.unmarshal(n.children[i+1], value)
|
|
inlineMap.SetMapIndex(name, value)
|
|
} else if d.strict {
|
|
d.terrors = append(d.terrors, fmt.Sprintf("line %d: field %s not found in struct %s", ni.line+1, name.String(), out.Type()))
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func failWantMap() {
|
|
failf("map merge requires map or sequence of maps as the value")
|
|
}
|
|
|
|
func (d *decoder) merge(n *node, out reflect.Value) {
|
|
switch n.kind {
|
|
case mappingNode:
|
|
d.unmarshal(n, out)
|
|
case aliasNode:
|
|
an, ok := d.doc.anchors[n.value]
|
|
if ok && an.kind != mappingNode {
|
|
failWantMap()
|
|
}
|
|
d.unmarshal(n, out)
|
|
case sequenceNode:
|
|
// Step backwards as earlier nodes take precedence.
|
|
for i := len(n.children) - 1; i >= 0; i-- {
|
|
ni := n.children[i]
|
|
if ni.kind == aliasNode {
|
|
an, ok := d.doc.anchors[ni.value]
|
|
if ok && an.kind != mappingNode {
|
|
failWantMap()
|
|
}
|
|
} else if ni.kind != mappingNode {
|
|
failWantMap()
|
|
}
|
|
d.unmarshal(ni, out)
|
|
}
|
|
default:
|
|
failWantMap()
|
|
}
|
|
}
|
|
|
|
func isMerge(n *node) bool {
|
|
return n.kind == scalarNode && n.value == "<<" && (n.implicit == true || n.tag == yaml_MERGE_TAG)
|
|
}
|