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mdwhatcott/custom_json.go

Created July 29, 2015 17:15
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  1. mdwhatcott created this gist Jul 29, 2015.
    59 changes: 59 additions & 0 deletions custom_json.go
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,59 @@
    package main

    import (
    "bytes"
    "encoding/json"
    "fmt"
    "strconv"
    )

    func main() {
    a := make(Stuff)
    a[1] = "asdf"
    a[-1] = "qwer"
    fmt.Println("Initial: ",a)

    stuff, err := json.Marshal(a)
    fmt.Println("Serialized: ", string(stuff), err)

    b := make(Stuff)
    err = json.Unmarshal(stuff, &b)
    fmt.Println("Deserialized:", b, err)
    }

    type Stuff map[int]string

    func (this Stuff) MarshalJSON() ([]byte, error) {
    buffer := bytes.NewBufferString("{")
    length := len(this)
    count := 0
    for key, value := range this {
    jsonValue, err := json.Marshal(value)
    if err != nil {
    return nil, err
    }
    buffer.WriteString(fmt.Sprintf("\"%d\":%s", key, string(jsonValue)))
    count++
    if count < length {
    buffer.WriteString(",")
    }
    }
    buffer.WriteString("}")
    return buffer.Bytes(), nil
    }

    func (this Stuff) UnmarshalJSON(b []byte) error {
    var stuff map[string]string
    err := json.Unmarshal(b, &stuff)
    if err != nil {
    return err
    }
    for key, value := range stuff {
    numericKey, err := strconv.Atoi(key)
    if err != nil {
    return err
    }
    this[numericKey] = value
    }
    return nil
    }