Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame] | 1 | // Copyright 2011 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package json |
| 6 | |
| 7 | import ( |
| 8 | "strings" |
| 9 | ) |
| 10 | |
| 11 | // tagOptions is the string following a comma in a struct field's "json" |
| 12 | // tag, or the empty string. It does not include the leading comma. |
| 13 | type tagOptions string |
| 14 | |
| 15 | // parseTag splits a struct field's json tag into its name and |
| 16 | // comma-separated options. |
| 17 | func parseTag(tag string) (string, tagOptions) { |
| 18 | if idx := strings.Index(tag, ","); idx != -1 { |
| 19 | return tag[:idx], tagOptions(tag[idx+1:]) |
| 20 | } |
| 21 | return tag, tagOptions("") |
| 22 | } |
| 23 | |
| 24 | // Contains reports whether a comma-separated list of options |
| 25 | // contains a particular substr flag. substr must be surrounded by a |
| 26 | // string boundary or commas. |
| 27 | func (o tagOptions) Contains(optionName string) bool { |
| 28 | if len(o) == 0 { |
| 29 | return false |
| 30 | } |
| 31 | s := string(o) |
| 32 | for s != "" { |
| 33 | var next string |
| 34 | i := strings.Index(s, ",") |
| 35 | if i >= 0 { |
| 36 | s, next = s[:i], s[i+1:] |
| 37 | } |
| 38 | if s == optionName { |
| 39 | return true |
| 40 | } |
| 41 | s = next |
| 42 | } |
| 43 | return false |
| 44 | } |