codeclimate/test-reporter

package formatters

import (
    "bytes"
    "encoding/json"
    "strings"

    "github.com/pkg/errors"
)

type Coverage []NullInt

// MarshalJSON marshals the coverage into JSON. Since the Code Climate
// API requires this as a string "[1,2,null]" and not just a straight
// JSON array we have to do a bunch of work to coerce into that format
func (c Coverage) MarshalJSON() ([]byte, error) {
    cc := make([]interface{}, 0, len(c))
    for _, x := range c {
        cc = append(cc, x)
    }
    bb := &bytes.Buffer{}
    err := json.NewEncoder(bb).Encode(cc)
    if err != nil {
        return bb.Bytes(), err
    }
    b, err := json.Marshal(strings.TrimSpace(bb.String()))

    if err != nil {
        return b, errors.WithStack(err)
    }

    return b, nil
}

var cwp = []byte("\"")
var cws = []byte("\"")

func (c *Coverage) UnmarshalJSON(text []byte) error {
    text = bytes.TrimPrefix(text, cwp)
    text = bytes.TrimSuffix(text, cws)
    cc := make([]NullInt, 0, 1024)

    err := json.Unmarshal(text, &cc)
    if err != nil {
        return err
    }
    *c = cc
    return nil
}

func (c *Coverage) AppendNulls(quantity int) Coverage {
    newCoverage := *c
    for i := 0; i < quantity; i++ {
        newCoverage = append(newCoverage, NullInt{})
    }
    return newCoverage
}