116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
package meta
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// Collection of Meta objects
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type Collection []*Data
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// SetTokenName sets TokenName for the all elements in the collection
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func (mc *Collection) SetTokenName(tn TokenName) *Collection {
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for _, m := range *mc {
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m.TokenName = tn
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}
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return mc
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}
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// Push adds elements to the end of an Collection
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func (mc *Collection) Push(mm ...*Data) *Collection {
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*mc = append(*mc, mm...)
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return mc
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}
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// Unshift prepends elements to the beginning of an Collection
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func (mc *Collection) Unshift(mm ...*Data) *Collection {
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*mc = append(mm, *mc...)
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return mc
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}
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// AppendTo - appends elements of the collection to the end of the target collection
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func (mc *Collection) AppendTo(target *Collection) *Collection {
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if len(*mc) == 0 {
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return mc
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}
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*target = append(*target, *mc...)
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return mc
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}
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// PrependTo - prepends elements of the collection to the start of the target collection
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func (mc *Collection) PrependTo(target *Collection) *Collection {
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if len(*mc) == 0 {
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return mc
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}
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*target = append(*mc, *target...)
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return mc
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}
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// Cut elements by TokenName
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func (mc *Collection) Cut(f Filter) *Collection {
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collection := (*mc)[:0]
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cutted := Collection{}
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for _, m := range *mc {
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if fr := f(m); fr {
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cutted = append(cutted, m)
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} else {
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collection = append(collection, m)
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}
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}
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*mc = collection
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return &cutted
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}
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// Filter function signature
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type Filter func(d *Data) bool
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// TokenNameFilter generates filter function that returns true
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// if data.TokenName exactly same as given
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func TokenNameFilter(tn TokenName) Filter {
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return func(d *Data) bool {
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return d.TokenName == tn
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}
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}
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// TypeFilter generates filter function that returns true
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// if data.Type exactly same as given
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func TypeFilter(t Type) Filter {
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return func(d *Data) bool {
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return d.Type == t
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}
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}
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// AndFilter generates filter function that returns true
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// if all given filters return true
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func AndFilter(filters ...Filter) Filter {
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return func(d *Data) bool {
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for _, filter := range filters {
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if result := filter(d); !result {
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return false
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}
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}
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return true
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}
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}
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// OrFilter generates filter function that returns true
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// if one of given filters return true
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func OrFilter(filters ...Filter) Filter {
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return func(d *Data) bool {
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for _, filter := range filters {
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if result := filter(d); result {
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return true
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}
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}
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return false
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}
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}
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// NotFilter negates given filter
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func NotFilter(f Filter) Filter {
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return func(d *Data) bool {
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return !f(d)
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}
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}
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