gopherjs - json/tags.go

     1  package json
     2  
     3  import "github.com/gopherjs/gopherjs/js"
     4  
     5  func getJSONTag(tag *js.Object) string {
     6  	strLen := tag.Length()
     7  	var val *js.Object
     8  	for i := 0; i < strLen; i++ {
     9  		start := i
    10  		for i < strLen && tag.Call("charCodeAt", i).Int() == ' ' {
    11  			i++
    12  		}
    13  		var char int
    14  		for ; i < strLen; i++ {
    15  			char = tag.Call("charCodeAt", i).Int()
    16  			if char <= ' ' || char == ':' || char == '"' {
    17  				break
    18  			}
    19  		}
    20  		if i+1 >= strLen || char != ':' || tag.Call("charCodeAt", i+1).Int() != '"' {
    21  			break
    22  		}
    23  		name := tag.Call("substring", start, i)
    24  		i += 2
    25  		start = i
    26  		for ; i < strLen; i++ {
    27  			char = tag.Call("charCodeAt", i).Int()
    28  			if char == '\\' {
    29  				i++
    30  			} else if char == '"' {
    31  				break
    32  			}
    33  		}
    34  		if name.String() == "json" {
    35  			val = tag.Call("substring", start, i)
    36  			break
    37  		}
    38  	}
    39  	if val == nil {
    40  		return ""
    41  	}
    42  	return val.String()
    43  }
    44  
    45  type tagOptions struct {
    46  	*js.Object
    47  }
    48  
    49  func parseTag(tag string) (string, tagOptions) {
    50  	split := js.Global.Get("String").Get("prototype").Get("indexOf").Call("call", tag, ",").Int()
    51  	if split < 0 {
    52  		return tag, tagOptions{nil}
    53  	}
    54  	return js.Global.Get("String").Get("prototype").Get("substr").Call("call", tag, 0, split).String(), tagOptions{js.Global.Get("String").Get("prototype").Get("substr").Call("call", tag, split+1)}
    55  }
    56  
    57  func (o tagOptions) Contains(option string) bool {
    58  	if o.Object == nil || o.Length() == 0 || o.Length() < len(option) {
    59  		return false
    60  	}
    61  	if o.Length() == len(option) {
    62  		return o.String() == option
    63  	}
    64  	return o.Call("substr", 0, len(option)+1).String() == option+"," || o.Call("substr", -1-len(option)).String() == ","+option || o.Call("includes", ","+option+",").Bool()
    65  }