golang yaml support for jsonlines - json

Question

I've been trying to get the go yaml package to parse a file with jsonlines entries.
Below is a simple example with three options of data to be parsed.
Option one is a multi-doc yaml example. Both docs parse ok.
Option two is a two jsonline example. The first line parses ok, but the second is missed.
Option three is a two jsonline example, but I've put yaml doc separators in between, to force the issue. Both of these parse ok.
From reading the yaml and json specs, I believe the second option, multiple jsonlines, ought to be handled by a yaml parser.
My questions are:
Should a YAML parser cope with jsonlines?
Am I using the go yaml package correctly?
package main
import (
"bytes"
"fmt"
"reflect"
"strings"
"gopkg.in/yaml.v2"
)
var testData = []string{
`
---
option_one_first_yaml_doc: ok_here
---
option_one_second_yaml_doc: ok_here
`,
`
{option_two_first_jsonl: ok_here}
{option_two_second_jsonl: missing}
`,
`
---
{option_three_first_jsonl: ok_here}
---
{option_three_second_jsonl: ok_here}
`}
func printVal(v interface{}, depth int) {
typ := reflect.TypeOf(v)
if typ == nil {
fmt.Printf(" %v\n", "<null>")
} else if typ.Kind() == reflect.Int || typ.Kind() == reflect.String {
fmt.Printf("%s%v\n", strings.Repeat(" ", depth), v)
} else if typ.Kind() == reflect.Slice {
fmt.Printf("\n")
printSlice(v.([]interface{}), depth+1)
} else if typ.Kind() == reflect.Map {
fmt.Printf("\n")
printMap(v.(map[interface{}]interface{}), depth+1)
}
}
func printMap(m map[interface{}]interface{}, depth int) {
for k, v := range m {
fmt.Printf("%sKey: %s Value(s):", strings.Repeat(" ", depth), k.(string))
printVal(v, depth+1)
}
}
func printSlice(slc []interface{}, depth int) {
for _, v := range slc {
printVal(v, depth+1)
}
}
func main() {
m := make(map[interface{}]interface{})
for _, data := range testData {
yamlData := bytes.NewReader([]byte(data))
decoder := yaml.NewDecoder(yamlData)
for decoder.Decode(&m) == nil {
printMap(m, 0)
m = make(map[interface{}]interface{})
}
}
}

Answer 1

jsonlines is newline delimited JSON. That means the individual lines are JSON, but not multiple lines and certainly not a whole file of multiple lines.
You will need to read the jsonlines input a line at a time, and those lines you should be able to process with go yaml, since YAML is a superset of JSON.
Since you also seem to have YAML end of indicator (---) lines in your test, you
need to process those as well.