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package main
import (
"fmt"
"io"
)
// only make one of these for each message in the protobuf file
func newIter(w io.Writer, FRUIT, APPLE, APPLES, LOCK string) {
fmt.Fprintln(w, "// DEFINE THE ITERATOR. is unique to the "+APPLE+" protobuf message")
fmt.Fprintln(w, "// itializes a new iterator.")
fmt.Fprintln(w, "func New"+APPLE+"Iterator(things []*"+APPLE+") *"+APPLE+"Iterator {")
fmt.Fprintln(w, " return &"+APPLE+"Iterator{things: things}")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// safely returns a slice of pointers to the FRUIT protobufs")
fmt.Fprintln(w, "func (x *"+FRUIT+") all"+APPLES+"() []*"+APPLE+" {")
fmt.Fprintln(w, " "+LOCK+".RLock()")
fmt.Fprintln(w, " defer "+LOCK+".RUnlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " // Create a new slice to hold pointers to each FRUIT")
fmt.Fprintln(w, " var tmp []*"+APPLE+"")
fmt.Fprintln(w, " tmp = make([]*"+APPLE+", len(x."+APPLES+"))")
fmt.Fprintln(w, " for i, p := range x."+APPLES+" {")
fmt.Fprintln(w, " tmp[i] = p // Copy pointers for safe iteration")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " return tmp")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "type "+APPLE+"Iterator struct {")
fmt.Fprintln(w, " sync.RWMutex // this isn't getting used properly yet?")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " things []*"+APPLE+"")
fmt.Fprintln(w, " index int")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (it *"+APPLE+"Iterator) Scan() bool {")
fmt.Fprintln(w, " if it.index >= len(it.things) {")
fmt.Fprintln(w, " return false")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " it.index++")
fmt.Fprintln(w, " return true")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// Next() returns the next thing in the array")
fmt.Fprintln(w, "func (it *"+APPLE+"Iterator) Next() *"+APPLE+" {")
fmt.Fprintln(w, " if it.things[it.index-1] == nil {")
fmt.Fprintln(w, " fmt.Println(\"Next() error in "+APPLE+"Iterator\", it.index)")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " return it.things[it.index-1]")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// END DEFINE THE ITERATOR")
fmt.Fprintln(w, "")
}
func newSortBy(w io.Writer, FRUIT, APPLE, APPLES, COLOR string) {
fmt.Fprintln(w, "// START sort by ", COLOR, "(this is all you need once the Iterator is defined)")
fmt.Fprintln(w, "type "+APPLE+COLOR+" []*"+APPLE+"")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (a "+APPLE+COLOR+") Len() int { return len(a) }")
fmt.Fprintln(w, "func (a "+APPLE+COLOR+") Less(i, j int) bool { return a[i]."+COLOR+" < a[j]."+COLOR+" }")
fmt.Fprintln(w, "func (a "+APPLE+COLOR+") Swap(i, j int) { a[i], a[j] = a[j], a[i] }")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (x *"+FRUIT+") SortBy"+COLOR+"() *"+APPLE+"Iterator {")
fmt.Fprintln(w, " things := x.all"+APPLES+"()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " sort.Sort("+APPLE+COLOR+"(things))")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " iterator := New"+APPLE+"Iterator(things)")
fmt.Fprintln(w, " return iterator")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "// END sort by", COLOR)
}
func addAllFunc(w io.Writer, FRUIT, APPLE, LOCK string) {
fmt.Fprintln(w, "func (x *"+FRUIT+") All() *"+APPLE+"Iterator {")
fmt.Fprintln(w, " "+APPLE+"Pointers := x.selectAll"+APPLE+"()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " iterator := New"+APPLE+"Iterator("+APPLE+"Pointers)")
fmt.Fprintln(w, " return iterator")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
func addLenFunc(w io.Writer, FRUIT, APPLES, LOCK string) {
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (x *"+FRUIT+") Len() int {")
fmt.Fprintln(w, " "+LOCK+".RLock()")
fmt.Fprintln(w, " defer "+LOCK+".RUnlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " return len(x."+APPLES+")")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
}
func addSelectAll(w io.Writer, FRUIT, APPLE, APPLES, LOCK string) {
fmt.Fprintln(w, "// safely returns a slice of pointers to the "+APPLE+" protobufs")
fmt.Fprintln(w, "func (x *"+FRUIT+") selectAll"+APPLE+"() []*"+APPLE+" {")
fmt.Fprintln(w, " "+LOCK+".RLock()")
fmt.Fprintln(w, " defer "+LOCK+".RUnlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " // Create a new slice to hold pointers to each "+APPLE+"")
fmt.Fprintln(w, " var tmp []*"+APPLE+"")
fmt.Fprintln(w, " tmp = make([]*"+APPLE+", len(x."+APPLES+"))")
fmt.Fprintln(w, " for i, p := range x."+APPLES+" {")
fmt.Fprintln(w, " tmp[i] = p // Copy pointers for safe iteration")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " return tmp")
fmt.Fprintln(w, "}")
}
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