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encoder.go
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encoder.go
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package xml2json
import (
"io"
"strings"
)
// An Encoder writes JSON objects to an output stream.
type Encoder struct {
w io.Writer
err error
}
// NewEncoder returns a new encoder that writes to w.
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w: w}
}
// Encode writes the JSON encoding of v to the stream
func (enc *Encoder) Encode(root *Node) error {
if enc.err != nil {
return enc.err
}
if root == nil {
return nil
}
enc.err = enc.format(root, 0)
// Terminate each value with a newline.
// This makes the output look a little nicer
// when debugging, and some kind of space
// is required if the encoded value was a number,
// so that the reader knows there aren't more
// digits coming.
enc.write("\n")
return enc.err
}
func (enc *Encoder) format(n *Node, lvl int) error {
if n.IsComplex() {
enc.write("{")
i := 0
tot := len(n.Children)
for label, children := range n.Children {
enc.write("\"")
enc.write(label)
enc.write("\": ")
if len(children) > 1 {
// Array
enc.write("[")
for j, c := range children {
enc.format(c, lvl+1)
if j < len(children)-1 {
enc.write(", ")
}
}
enc.write("]")
} else {
// Map
enc.format(children[0], lvl+1)
}
if i < tot-1 {
enc.write(", ")
}
i++
}
enc.write("}")
} else {
// TODO : Extract data type
enc.write("\"")
enc.write(escapeJSONString(n.Data))
enc.write("\"")
}
return nil
}
func (enc *Encoder) write(s string) {
enc.w.Write([]byte(s))
}
func escapeJSONString(s string) string {
return strings.Replace(s, "\"", "\\\"", -1)
}