forked from segmentio/objconv
/
parse.go
312 lines (248 loc) · 5.51 KB
/
parse.go
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package yaml
import (
"bytes"
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"time"
yaml "gopkg.in/yaml.v2"
"github.com/segmentio/objconv"
)
type Parser struct {
r io.Reader // reader to load bytes from
s []byte // string buffer
// This stack is used to iterate over the arrays and maps that get loaded in
// the value field.
stack []parser
}
func NewParser(r io.Reader) *Parser {
return &Parser{r: r}
}
func (p *Parser) Reset(r io.Reader) {
p.r = r
p.s = nil
p.stack = nil
}
func (p *Parser) Buffered() io.Reader {
return bytes.NewReader(nil)
}
func (p *Parser) ParseType() (typ objconv.Type, err error) {
if p.stack == nil {
var b []byte
var v interface{}
if b, err = ioutil.ReadAll(p.r); err != nil {
return
}
if err = yaml.Unmarshal(b, &v); err != nil {
return
}
p.push(newParser(v))
}
switch v := p.value(); v.(type) {
case nil:
typ = objconv.Nil
case bool:
typ = objconv.Bool
case int, int64:
typ = objconv.Int
case uint64:
typ = objconv.Uint
case float64:
typ = objconv.Float
case string:
typ = objconv.String
case yaml.MapSlice:
typ = objconv.Map
case []interface{}:
typ = objconv.Array
case eof:
err = io.EOF
default:
err = fmt.Errorf("objconv/yaml: gopkg.in/yaml.v2 generated an unsupported value of type %T", v)
}
return
}
func (p *Parser) ParseNil() (err error) {
p.pop()
return
}
func (p *Parser) ParseBool() (v bool, err error) {
v = p.pop().value().(bool)
return
}
func (p *Parser) ParseInt() (v int64, err error) {
switch x := p.pop().value().(type) {
case int:
v = int64(x)
default:
v = x.(int64)
}
return
}
func (p *Parser) ParseUint() (v uint64, err error) {
v = p.pop().value().(uint64)
return
}
func (p *Parser) ParseFloat() (v float64, err error) {
v = p.pop().value().(float64)
return
}
func (p *Parser) ParseString() (v []byte, err error) {
s := p.pop().value().(string)
n := len(s)
if cap(p.s) < n {
p.s = make([]byte, 0, ((n/1024)+1)*1024)
}
v = p.s[:n]
copy(v, s)
return
}
func (p *Parser) ParseBytes() (v []byte, err error) {
panic("objconv/yaml: ParseBytes should never be called because YAML has no bytes type, this is likely a bug in the decoder code")
}
func (p *Parser) ParseTime() (v time.Time, err error) {
panic("objconv/yaml: ParseBytes should never be called because YAML has no time type, this is likely a bug in the decoder code")
}
func (p *Parser) ParseDuration() (v time.Duration, err error) {
panic("objconv/yaml: ParseDuration should never be called because YAML has no duration type, this is likely a bug in the decoder code")
}
func (p *Parser) ParseError() (v error, err error) {
panic("objconv/yaml: ParseError should never be called because YAML has no error type, this is likely a bug in the decoder code")
}
func (p *Parser) ParseArrayBegin() (n int, err error) {
if n = p.top().len(); n != 0 {
p.push(newParser(p.top().next()))
}
return
}
func (p *Parser) ParseArrayEnd(n int) (err error) {
p.pop()
return
}
func (p *Parser) ParseArrayNext(n int) (err error) {
p.push(newParser(p.top().next()))
return
}
func (p *Parser) ParseMapBegin() (n int, err error) {
if n = p.top().len(); n != 0 {
p.push(newParser(p.top().next()))
}
return
}
func (p *Parser) ParseMapEnd(n int) (err error) {
p.pop()
return
}
func (p *Parser) ParseMapValue(n int) (err error) {
p.push(newParser(p.top().next()))
return
}
func (p *Parser) ParseMapNext(n int) (err error) {
p.push(newParser(p.top().next()))
return
}
func (p *Parser) DecodeBytes(b []byte) (v []byte, err error) {
var n int
if n, err = base64.StdEncoding.Decode(b, b); err != nil {
return
}
v = b[:n]
return
}
func (p *Parser) push(v parser) {
p.stack = append(p.stack, v)
}
func (p *Parser) pop() parser {
i := len(p.stack) - 1
v := p.stack[i]
p.stack = p.stack[:i]
return v
}
func (p *Parser) top() parser {
return p.stack[len(p.stack)-1]
}
func (p *Parser) value() interface{} {
n := len(p.stack)
if n == 0 {
return eof{}
}
return p.stack[n-1].value()
}
type parser interface {
value() interface{}
next() interface{}
len() int
}
type valueParser struct {
self interface{}
}
func (p *valueParser) value() interface{} {
return p.self
}
func (p *valueParser) next() interface{} {
panic("objconv/yaml: invalid call of next method on simple value parser")
}
func (p *valueParser) len() int {
panic("objconv/yaml: invalid call of len method on simple value parser")
}
type arrayParser struct {
self []interface{}
off int
}
func (p *arrayParser) value() interface{} {
return p.self
}
func (p *arrayParser) next() interface{} {
v := p.self[p.off]
p.off++
return v
}
func (p *arrayParser) len() int {
return len(p.self)
}
type mapParser struct {
self yaml.MapSlice
off int
val bool
}
func (p *mapParser) value() interface{} {
return p.self
}
func (p *mapParser) next() (v interface{}) {
if p.val {
v = p.self[p.off].Value
p.val = false
p.off++
} else {
v = p.self[p.off].Key
p.val = true
}
return
}
func (p *mapParser) len() int {
return len(p.self)
}
func newParser(v interface{}) parser {
switch x := v.(type) {
case map[interface{}]interface{}:
return &mapParser{self: makeMapSlice(x)}
case []interface{}:
return &arrayParser{self: x}
default:
return &valueParser{self: x}
}
}
func makeMapSlice(m map[interface{}]interface{}) yaml.MapSlice {
s := make(yaml.MapSlice, 0, len(m))
for k, v := range m {
s = append(s, yaml.MapItem{
Key: k,
Value: v,
})
}
return s
}
// eof values are returned by the top method to indicate that all values have
// already been consumed.
type eof struct{}