122 lines
2.3 KiB
Go
122 lines
2.3 KiB
Go
package versions
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import (
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"bytes"
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"fmt"
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)
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type setUnion []setI
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func (s setUnion) Has(v Version) bool {
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for _, ss := range s {
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if ss.Has(v) {
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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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func (s setUnion) AllRequested() Set {
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// Since a union includes everything from its members, it includes all
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// of the requested versions from its members too.
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if len(s) == 0 {
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return None
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}
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si := make(setUnion, 0, len(s))
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for _, ss := range s {
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ar := ss.AllRequested()
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if ar == None {
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continue
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}
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si = append(si, ar.setI)
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}
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if len(si) == 1 {
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return Set{setI: si[0]}
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}
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return Set{setI: si}
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}
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func (s setUnion) GoString() string {
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var buf bytes.Buffer
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fmt.Fprint(&buf, "versions.Union(")
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for i, ss := range s {
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if i == 0 {
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fmt.Fprint(&buf, ss.GoString())
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} else {
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fmt.Fprintf(&buf, ", %#v", ss)
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}
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}
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fmt.Fprint(&buf, ")")
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return buf.String()
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}
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// Union creates a new set that contains all of the given versions.
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//
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// The result is finite only if the receiver and all of the other given sets
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// are finite.
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func Union(sets ...Set) Set {
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if len(sets) == 0 {
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return None
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}
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r := make(setUnion, 0, len(sets))
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for _, set := range sets {
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if set == None {
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continue
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}
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if su, ok := set.setI.(setUnion); ok {
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r = append(r, su...)
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} else {
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r = append(r, set.setI)
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}
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}
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if len(r) == 1 {
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return Set{setI: r[0]}
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}
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return Set{setI: r}
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}
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// Union returns a new set that contains all of the versions from the
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// receiver and all of the versions from each of the other given sets.
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//
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// The result is finite only if the receiver and all of the other given sets
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// are finite.
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func (s Set) Union(others ...Set) Set {
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r := make(setUnion, 1, len(others)+1)
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r[0] = s.setI
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for _, ss := range others {
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if ss == None {
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continue
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}
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if su, ok := ss.setI.(setUnion); ok {
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r = append(r, su...)
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} else {
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r = append(r, ss.setI)
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}
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}
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if len(r) == 1 {
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return Set{setI: r[0]}
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}
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return Set{setI: r}
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}
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var _ setFinite = setUnion{}
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func (s setUnion) isFinite() bool {
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// union is finite only if all of its members are finite
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for _, ss := range s {
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if !isFinite(ss) {
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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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func (s setUnion) listVersions() List {
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var ret List
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for _, ss := range s {
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ret = append(ret, ss.(setFinite).listVersions()...)
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}
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return ret
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}
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