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Diffstat (limited to 'libgo/go/encoding/json/tags.go')
-rw-r--r-- | libgo/go/encoding/json/tags.go | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libgo/go/encoding/json/tags.go b/libgo/go/encoding/json/tags.go new file mode 100644 index 0000000..58cda20 --- /dev/null +++ b/libgo/go/encoding/json/tags.go @@ -0,0 +1,44 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package json + +import ( + "strings" +) + +// tagOptions is the string following a comma in a struct field's "json" +// tag, or the empty string. It does not include the leading comma. +type tagOptions string + +// parseTag splits a struct field's json tag into its name and +// comma-separated options. +func parseTag(tag string) (string, tagOptions) { + if idx := strings.Index(tag, ","); idx != -1 { + return tag[:idx], tagOptions(tag[idx+1:]) + } + return tag, tagOptions("") +} + +// Contains returns whether checks that a comma-separated list of options +// contains a particular substr flag. substr must be surrounded by a +// string boundary or commas. +func (o tagOptions) Contains(optionName string) bool { + if len(o) == 0 { + return false + } + s := string(o) + for s != "" { + var next string + i := strings.Index(s, ",") + if i >= 0 { + s, next = s[:i], s[i+1:] + } + if s == optionName { + return true + } + s = next + } + return false +} |