ugly json parsing.go

package main

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

type WebPage struct {
	Body []map[string]Values `json:"body"`
}

// Only one of them are set.
type Values struct {
	Entrytext *string `json:"entrytext"`
	EntryText *string `json:"entryText"`
	Url       *string `json:"url"`
	Html      *string `json:"html"`
}

func (v *Values) HTML() string {
	if v.Entrytext != nil {
		return *v.Entrytext
	}
	if v.EntryText != nil {
		return *v.EntryText
	}
	if v.Url != nil {
		return fmt.Sprintf(`<img src="%s">`, *v.Url)
	}
	if v.Html != nil {
		return *v.Html
	}
	return ""
}

func (p *WebPage) HTML() string {
	var buffer bytes.Buffer
	for _, m := range p.Body {
		for k := range m {
			v := m[k]
			s := v.HTML()
			if s != "" {
				buffer.WriteString(s)
			}
			break
		}
	}
	return buffer.String()
}

const input = `{
	"body": [{
		"entrytitle": {}
	}, {
		"entry": {
			"entrytext": "<p>hello</p>"
		}
	}, {
		"image": {
			"url": "http://google.com/a.jpg",
			"width": 100
		}
	}, {
		"entry_0": {
			"entryText": "<p>world</p>"
		}
	}, {
		"htmlcomponent[23]": {
			"html": "<p>hello</p>"
		}
	}]
}`

func main() {
	var p WebPage

	if err := json.Unmarshal([]byte(input), &p); err != nil {
		log.Fatal(err)
	}

	log.Print(p.HTML())
}