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attr.go
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attr.go
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package htmlx
import (
"fmt"
"strings"
"golang.org/x/net/html"
)
// AttrVal returns the attribute value with the specified key name.
// If the attribute is not specified, the false flag is returned by the second
// value.
func AttrVal(attrs []html.Attribute, key string) (val string, ok bool) {
for _, attr := range attrs {
if attr.Key == key {
return attr.Val, true
}
}
return
}
// SetAttr set the new attribute value with the specified key name.
func SetAttr(attrs []html.Attribute, key, val string) []html.Attribute {
for _, attr := range attrs {
if attr.Key == key {
attr.Val = val
return attrs
}
}
return append(attrs, html.Attribute{Key: key, Val: val})
}
// RemoveAttr removes the attribute with the specified key name.
func RemoveAttr(attrs []html.Attribute, key string) []html.Attribute {
for i, attr := range attrs {
if attr.Key == key {
return append(attrs[:i], attrs[i+1:]...)
}
}
return attrs
}
// HasAttrWord returns true if the attribute value with the specified key name
// and specified word in value is found.
func HasAttrWord(attrs []html.Attribute, key, word string) bool {
val, ok := AttrVal(attrs, key)
if !ok {
return false
}
for _, w := range strings.Fields(val) {
if w == word {
return true
}
}
return false
}
// AddAttrWord add new word to attribute value.
func AddAttrWord(attrs []html.Attribute, key, word string) []html.Attribute {
val, ok := AttrVal(attrs, key)
if !ok || val == "" {
return SetAttr(attrs, key, word)
}
for _, w := range strings.Fields(val) {
if w == val {
return attrs
}
}
return SetAttr(attrs, key, fmt.Sprintln(val, word))
}