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reflect: document multiple keys in struct tags

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For #40281
Fixes #42959

Change-Id: Ibc4769fda1592a1373ec720ea30baf319c0a0136
Reviewed-on: https://go-review.googlesource.com/c/go/+/274448
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Ian Lance Taylor 2020-12-02 18:25:19 -08:00
parent 7ad6596c47
commit 9b8c272558
1 changed files with 10 additions and 6 deletions
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16
src/reflect/type.go
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@ -1104,12 +1104,16 @@ type StructField struct {
// A StructTag is the tag string in a struct field.
//
// By convention, tag strings are a concatenation of
// optionally space-separated key:"value" pairs.
// Each key is a non-empty string consisting of non-control
// characters other than space (U+0020 ' '), quote (U+0022 '"'),
// and colon (U+003A ':'). Each value is quoted using U+0022 '"'
// characters and Go string literal syntax.
// By convention, tag strings are a mapping of keys to values.
// The format is key:"value". Each key is a non-empty string consisting
// of non-control characters other than space (U+0020 ' '),
// quote (U+0022 '"'), and colon (U+003A ':'). Each value is quoted
// using U+0022 '"' characters and Go string literal syntax.
// Multiple key-value mappings are separated by zero or more spaces, as in
// key1:"value1" key2:"value2"
// Multiple keys may map to a single shared value by separating the keys
// with spaces, as in
// key1 key2:"value"
type StructTag string
// Get returns the value associated with key in the tag string.