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inputs.go
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inputs.go
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package yq
// Borrowed from gojq - cli package
// ref: https://github.com/itchyny/gojq/blob/main/cli/inputs.go
import (
"bytes"
"io"
"log"
"os"
"gopkg.in/yaml.v3"
"github.com/itchyny/gojq"
)
type inputReader struct {
io.Reader
file *os.File
buf *bytes.Buffer
}
func newInputReader(r io.Reader) *inputReader {
if r, ok := r.(*os.File); ok {
if _, err := r.Seek(0, io.SeekCurrent); err == nil {
return &inputReader{r, r, nil}
}
}
var buf bytes.Buffer // do not use strings.Builder because we need to Reset
return &inputReader{io.TeeReader(r, &buf), nil, &buf}
}
func (ir *inputReader) getContents(offset *int64, line *int) string {
if buf := ir.buf; buf != nil {
return buf.String()
}
if current, err := ir.file.Seek(0, io.SeekCurrent); err == nil {
defer func() {
if _, err := ir.file.Seek(current, io.SeekStart); err != nil {
log.Fatalln("error reading yaml input from stdin")
}
}()
}
if _, err := ir.file.Seek(0, io.SeekStart); err != nil {
log.Fatalln("error reading yaml input from stdin")
}
const bufSize = 16 * 1024
var buf bytes.Buffer // do not use strings.Builder because we need to Reset
if offset != nil && *offset > bufSize {
buf.Grow(bufSize)
for *offset > bufSize {
n, err := io.Copy(&buf, io.LimitReader(ir.file, bufSize))
*offset -= n
*line += bytes.Count(buf.Bytes(), []byte{'\n'})
buf.Reset()
if err != nil || n == 0 {
break
}
}
}
var r io.Reader
if offset == nil {
r = ir.file
} else {
r = io.LimitReader(ir.file, bufSize*2)
}
_, err := io.Copy(&buf, r)
if err != nil {
log.Fatalln("error copying input into buffer")
}
return buf.String()
}
type InputIter interface {
gojq.Iter
io.Closer
Name() string
}
type yamlInputIter struct {
dec *yaml.Decoder
ir *inputReader
fname string
err error
}
func NewYAMLInputIter(r io.Reader, fname string) InputIter {
ir := newInputReader(r)
dec := yaml.NewDecoder(ir)
return &yamlInputIter{dec: dec, ir: ir, fname: fname}
}
func (i *yamlInputIter) Next() (interface{}, bool) {
if i.err != nil {
return nil, false
}
var v interface{}
if err := i.dec.Decode(&v); err != nil {
if err == io.EOF {
i.err = err
return nil, false
}
i.err = &yamlParseError{i.fname, i.ir.getContents(nil, nil), err}
return i.err, true
}
return normalizeYAML(v), true
}
func (i *yamlInputIter) Close() error {
i.err = io.EOF
return nil
}
func (i *yamlInputIter) Name() string {
return i.fname
}