mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
package toml
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// TODO: Build a decent encoder.
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// Interestingly, this isn't as trivial as recursing down the type of the
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// value given and outputting the corresponding TOML. In particular, multiple
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// TOML types (especially if tuples are added) can map to a single Go type, so
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// that the reverse correspondence isn't clear.
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//
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// One possible avenue is to choose a reasonable default (like structs map
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// to hashes), but allow the user to override with struct tags. But this seems
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// like a mess.
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//
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// The other possibility is to scrap an encoder altogether. After all, TOML
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// is a configuration file format, and not a data exchange format.
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import (
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"bufio"
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"fmt"
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"io"
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"reflect"
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"strings"
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)
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type encoder struct {
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// A single indentation level. By default it is two spaces.
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Indent string
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w *bufio.Writer
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}
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func newEncoder(w io.Writer) *encoder {
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return &encoder{
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w: bufio.NewWriter(w),
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Indent: " ",
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}
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}
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func (enc *encoder) Encode(v interface{}) error {
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rv := eindirect(reflect.ValueOf(v))
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if err := enc.encode(Key([]string{}), rv); err != nil {
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return err
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}
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return enc.w.Flush()
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}
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func (enc *encoder) encode(key Key, rv reflect.Value) error {
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k := rv.Kind()
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switch k {
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case reflect.Struct:
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return enc.eStruct(key, rv)
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case reflect.String:
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return enc.eString(key, rv)
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}
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return e("Unsupported type for key '%s': %s", key, k)
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}
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func (enc *encoder) eStruct(key Key, rv reflect.Value) error {
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rt := rv.Type()
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for i := 0; i < rt.NumField(); i++ {
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sft := rt.Field(i)
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sf := rv.Field(i)
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if err := enc.encode(key.add(sft.Name), sf); err != nil {
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return err
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}
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}
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return nil
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}
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func (enc *encoder) eString(key Key, rv reflect.Value) error {
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s := rv.String()
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s = strings.NewReplacer(
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"\t", "\\t",
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"\n", "\\n",
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"\r", "\\r",
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"\"", "\\\"",
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"\\", "\\\\",
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).Replace(s)
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s = "\"" + s + "\""
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if err := enc.eKeyVal(key, s); err != nil {
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return err
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}
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return nil
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}
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func (enc *encoder) eKeyVal(key Key, value string) error {
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out := fmt.Sprintf("%s%s = %s",
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strings.Repeat(enc.Indent, len(key)-1), key[len(key)-1], value)
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if _, err := fmt.Fprintln(enc.w, out); err != nil {
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return err
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}
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return nil
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}
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func eindirect(v reflect.Value) reflect.Value {
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if v.Kind() != reflect.Ptr {
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return v
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}
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return eindirect(reflect.Indirect(v))
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}
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