44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package jsonld
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import (
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"strings"
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)
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// tagOptions is the string following a comma in a struct field's "json"
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// tag, or the empty string. It does not include the leading comma.
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type tagOptions string
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// parseTag splits a struct field's json tag into its name and
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// comma-separated options.
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func parseTag(tag string) (string, tagOptions) {
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if idx := strings.Index(tag, ","); idx != -1 {
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return tag[:idx], tagOptions(tag[idx+1:])
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}
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return tag, tagOptions("")
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}
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// Contains reports whether a comma-separated list of options
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// contains a particular substr flag. substr must be surrounded by a
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// string boundary or commas.
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func (o tagOptions) Contains(optionName string) bool {
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if len(o) == 0 {
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return false
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}
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s := string(o)
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for s != "" {
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var next string
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i := strings.Index(s, ",")
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if i >= 0 {
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s, next = s[:i], s[i+1:]
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}
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if s == optionName {
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return true
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}
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s = next
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}
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return false
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}
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