mirror of
https://github.com/rancher/os.git
synced 2025-09-20 10:03:59 +00:00
move dependencies to vendor
This commit is contained in:
Ivan Mikushin
571
vendor/github.com/coreos/yaml/decode.go
generated
vendored
Normal file
571
vendor/github.com/coreos/yaml/decode.go
generated
vendored
Normal file
@@ -0,0 +1,571 @@
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package yaml
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import (
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"encoding/base64"
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"fmt"
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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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transform transformString
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}
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func newParser(b []byte, t transformString) *parser {
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p := parser{transform: t}
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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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fail("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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fail(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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panic("unreachable")
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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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key := p.parse()
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key.value = p.transform(key.value)
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value := p.parse()
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n.children = append(n.children, key, value)
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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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}
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func newDecoder() *decoder {
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d := &decoder{}
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d.aliases = make(map[string]bool)
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return d
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}
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// d.setter deals with setters and pointer dereferencing and initialization.
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//
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// It's a slightly convoluted case to handle properly:
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//
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// - nil pointers should be initialized, unless being set to nil
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// - we don't know at this point yet what's the value to SetYAML() with.
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// - we can't separate pointer deref/init and setter checking, because
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// a setter may be found while going down a pointer chain.
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//
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// Thus, here is how it takes care of it:
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//
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// - out is provided as a pointer, so that it can be replaced.
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// - when looking at a non-setter ptr, *out=ptr.Elem(), unless tag=!!null
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// - when a setter is found, *out=interface{}, and a set() function is
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// returned to call SetYAML() with the value of *out once it's defined.
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//
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func (d *decoder) setter(tag string, out *reflect.Value, good *bool) (set func()) {
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if (*out).Kind() != reflect.Ptr && (*out).CanAddr() {
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setter, _ := (*out).Addr().Interface().(Setter)
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if setter != nil {
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var arg interface{}
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*out = reflect.ValueOf(&arg).Elem()
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return func() {
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*good = setter.SetYAML(shortTag(tag), arg)
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}
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}
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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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setter, _ := (*out).Interface().(Setter)
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if tag != yaml_NULL_TAG || setter != nil {
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if pv := (*out); pv.Kind() == reflect.Ptr {
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if pv.IsNil() {
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*out = reflect.New(pv.Type().Elem()).Elem()
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pv.Set((*out).Addr())
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} else {
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*out = pv.Elem()
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}
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setter, _ = pv.Interface().(Setter)
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again = true
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}
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}
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if setter != nil {
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var arg interface{}
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*out = reflect.ValueOf(&arg).Elem()
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return func() {
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*good = setter.SetYAML(shortTag(tag), arg)
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}
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}
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}
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return nil
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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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good = d.document(n, out)
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case scalarNode:
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good = d.scalar(n, out)
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case aliasNode:
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good = d.alias(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
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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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fail("Unknown anchor '" + n.value + "' referenced")
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}
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if d.aliases[n.value] {
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fail("Anchor '" + n.value + "' value contains itself")
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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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var durationType = reflect.TypeOf(time.Duration(0))
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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 {
|
||||
tag, resolved = resolve(n.tag, n.value)
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||||
if tag == yaml_BINARY_TAG {
|
||||
data, err := base64.StdEncoding.DecodeString(resolved.(string))
|
||||
if err != nil {
|
||||
fail("!!binary value contains invalid base64 data")
|
||||
}
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||||
resolved = string(data)
|
||||
}
|
||||
}
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||||
if set := d.setter(tag, &out, &good); set != nil {
|
||||
defer set()
|
||||
}
|
||||
if resolved == nil {
|
||||
if out.Kind() == reflect.Map && !out.CanAddr() {
|
||||
resetMap(out)
|
||||
} else {
|
||||
out.Set(reflect.Zero(out.Type()))
|
||||
}
|
||||
good = true
|
||||
return
|
||||
}
|
||||
switch out.Kind() {
|
||||
case reflect.String:
|
||||
if tag == yaml_BINARY_TAG {
|
||||
out.SetString(resolved.(string))
|
||||
good = true
|
||||
} else if resolved != nil {
|
||||
out.SetString(n.value)
|
||||
good = true
|
||||
}
|
||||
case reflect.Interface:
|
||||
if resolved == nil {
|
||||
out.Set(reflect.Zero(out.Type()))
|
||||
} else {
|
||||
out.Set(reflect.ValueOf(resolved))
|
||||
}
|
||||
good = true
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||||
switch resolved := resolved.(type) {
|
||||
case int:
|
||||
if !out.OverflowInt(int64(resolved)) {
|
||||
out.SetInt(int64(resolved))
|
||||
good = true
|
||||
}
|
||||
case int64:
|
||||
if !out.OverflowInt(resolved) {
|
||||
out.SetInt(resolved)
|
||||
good = true
|
||||
}
|
||||
case float64:
|
||||
if resolved < 1<<63-1 && !out.OverflowInt(int64(resolved)) {
|
||||
out.SetInt(int64(resolved))
|
||||
good = true
|
||||
}
|
||||
case string:
|
||||
if out.Type() == durationType {
|
||||
d, err := time.ParseDuration(resolved)
|
||||
if err == nil {
|
||||
out.SetInt(int64(d))
|
||||
good = true
|
||||
}
|
||||
}
|
||||
}
|
||||
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
||||
switch resolved := resolved.(type) {
|
||||
case int:
|
||||
if resolved >= 0 {
|
||||
out.SetUint(uint64(resolved))
|
||||
good = true
|
||||
}
|
||||
case int64:
|
||||
if resolved >= 0 {
|
||||
out.SetUint(uint64(resolved))
|
||||
good = true
|
||||
}
|
||||
case float64:
|
||||
if resolved < 1<<64-1 && !out.OverflowUint(uint64(resolved)) {
|
||||
out.SetUint(uint64(resolved))
|
||||
good = true
|
||||
}
|
||||
}
|
||||
case reflect.Bool:
|
||||
switch resolved := resolved.(type) {
|
||||
case bool:
|
||||
out.SetBool(resolved)
|
||||
good = true
|
||||
}
|
||||
case reflect.Float32, reflect.Float64:
|
||||
switch resolved := resolved.(type) {
|
||||
case int:
|
||||
out.SetFloat(float64(resolved))
|
||||
good = true
|
||||
case int64:
|
||||
out.SetFloat(float64(resolved))
|
||||
good = true
|
||||
case float64:
|
||||
out.SetFloat(resolved)
|
||||
good = true
|
||||
}
|
||||
case reflect.Ptr:
|
||||
if out.Type().Elem() == reflect.TypeOf(resolved) {
|
||||
elem := reflect.New(out.Type().Elem())
|
||||
elem.Elem().Set(reflect.ValueOf(resolved))
|
||||
out.Set(elem)
|
||||
good = true
|
||||
}
|
||||
}
|
||||
return good
|
||||
}
|
||||
|
||||
func settableValueOf(i interface{}) reflect.Value {
|
||||
v := reflect.ValueOf(i)
|
||||
sv := reflect.New(v.Type()).Elem()
|
||||
sv.Set(v)
|
||||
return sv
|
||||
}
|
||||
|
||||
func (d *decoder) sequence(n *node, out reflect.Value) (good bool) {
|
||||
if set := d.setter(yaml_SEQ_TAG, &out, &good); set != nil {
|
||||
defer set()
|
||||
}
|
||||
var iface reflect.Value
|
||||
if out.Kind() == reflect.Interface {
|
||||
// No type hints. Will have to use a generic sequence.
|
||||
iface = out
|
||||
out = settableValueOf(make([]interface{}, 0))
|
||||
}
|
||||
|
||||
if out.Kind() != reflect.Slice {
|
||||
return false
|
||||
}
|
||||
et := out.Type().Elem()
|
||||
|
||||
l := len(n.children)
|
||||
for i := 0; i < l; i++ {
|
||||
e := reflect.New(et).Elem()
|
||||
if ok := d.unmarshal(n.children[i], e); ok {
|
||||
out.Set(reflect.Append(out, e))
|
||||
}
|
||||
}
|
||||
if iface.IsValid() {
|
||||
iface.Set(out)
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func (d *decoder) mapping(n *node, out reflect.Value) (good bool) {
|
||||
if set := d.setter(yaml_MAP_TAG, &out, &good); set != nil {
|
||||
defer set()
|
||||
}
|
||||
if out.Kind() == reflect.Struct {
|
||||
return d.mappingStruct(n, out)
|
||||
}
|
||||
|
||||
if out.Kind() == reflect.Interface {
|
||||
// No type hints. Will have to use a generic map.
|
||||
iface := out
|
||||
out = settableValueOf(make(map[interface{}]interface{}))
|
||||
iface.Set(out)
|
||||
}
|
||||
|
||||
if out.Kind() != reflect.Map {
|
||||
return false
|
||||
}
|
||||
outt := out.Type()
|
||||
kt := outt.Key()
|
||||
et := outt.Elem()
|
||||
|
||||
if out.IsNil() {
|
||||
out.Set(reflect.MakeMap(outt))
|
||||
}
|
||||
l := len(n.children)
|
||||
for i := 0; i < l; i += 2 {
|
||||
if isMerge(n.children[i]) {
|
||||
d.merge(n.children[i+1], out)
|
||||
continue
|
||||
}
|
||||
k := reflect.New(kt).Elem()
|
||||
if d.unmarshal(n.children[i], k) {
|
||||
kkind := k.Kind()
|
||||
if kkind == reflect.Interface {
|
||||
kkind = k.Elem().Kind()
|
||||
}
|
||||
if kkind == reflect.Map || kkind == reflect.Slice {
|
||||
fail(fmt.Sprintf("invalid map key: %#v", k.Interface()))
|
||||
}
|
||||
e := reflect.New(et).Elem()
|
||||
if d.unmarshal(n.children[i+1], e) {
|
||||
out.SetMapIndex(k, e)
|
||||
}
|
||||
}
|
||||
}
|
||||
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)
|
||||
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)
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func (d *decoder) merge(n *node, out reflect.Value) {
|
||||
const wantMap = "map merge requires map or sequence of maps as the value"
|
||||
switch n.kind {
|
||||
case mappingNode:
|
||||
d.unmarshal(n, out)
|
||||
case aliasNode:
|
||||
an, ok := d.doc.anchors[n.value]
|
||||
if ok && an.kind != mappingNode {
|
||||
fail(wantMap)
|
||||
}
|
||||
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 {
|
||||
fail(wantMap)
|
||||
}
|
||||
} else if ni.kind != mappingNode {
|
||||
fail(wantMap)
|
||||
}
|
||||
d.unmarshal(ni, out)
|
||||
}
|
||||
default:
|
||||
fail(wantMap)
|
||||
}
|
||||
}
|
||||
|
||||
func isMerge(n *node) bool {
|
||||
return n.kind == scalarNode && n.value == "<<" && (n.implicit == true || n.tag == yaml_MERGE_TAG)
|
||||
}
|
||||
Reference in New Issue
Block a user