tags.go

Documentation: encoding/json

		 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  }
		45
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