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Copy pathencoder.go
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encoder.go
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package brief
import (
"fmt"
"strings"
"text/scanner"
)
// Encode converts a node into brief format
func (node *Node) Encode() []byte {
var out strings.Builder
body := node.write(&out)
for len(body) > 0 {
next := body[0]
body = body[1:]
more := next.write(&out)
body = append(more, body...)
}
return []byte(out.String())
}
// NoQuote tests if the value is an identifier or number
func NoQuote(value string) bool {
var s scanner.Scanner
s.Init(strings.NewReader(value))
tok := s.Scan()
var minus bool
for {
switch tok {
case scanner.Ident:
return !minus && s.TokenText() == value
case scanner.Float, scanner.Int:
numval := s.TokenText()
if minus {
numval = "-" + numval
}
return numval == value
case '-':
if minus {
return false
}
minus = true
tok = s.Scan()
default:
return false
}
}
}
func (node *Node) write(out *strings.Builder) []*Node {
indent := strings.Repeat(" ", node.Indent)
out.WriteString(indent + node.Type)
if len(node.Name) > 0 {
if NoQuote(node.Name) {
out.WriteString(":" + node.Name)
} else {
out.WriteString(fmt.Sprintf(":%q", node.Name))
}
}
for key, val := range node.Keys {
if NoQuote(val) {
out.WriteString(fmt.Sprintf(" %s:%s", key, val))
continue
}
out.WriteString(fmt.Sprintf(" %s:%q", key, val))
}
if len(node.Content) > 0 {
out.WriteString(fmt.Sprintf(" `%s`", node.Content))
}
out.WriteString("\n")
return node.Body
}