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package main
import (
"fmt"
"io"
)
func (msg *MsgName) newIterAll(w io.Writer, FRUIT, APPLE, APPLES, LOCKold string) string {
LOCK := msg.getLockname("x")
funcdef := "func (x *" + FRUIT + ") all" + APPLES + "() []*" + APPLE + " {"
fmt.Fprintln(w, "// safely returns a slice of pointers to the FRUIT protobufs")
fmt.Fprintln(w, funcdef)
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, "")
return funcdef
}
// only make one of these for each message in the protobuf file
func newIter(w io.Writer, msg *MsgName) string {
if !msg.NeedIter {
return "iter already done for " + msg.Name
}
msg.NeedIter = false
APPLE := msg.Name
// should this be 'new' or 'New' ? Does it matter? I think it's totally internal here
// in this file where it is "new or "New". I changed it to lower case 2025.01.12
funcdef := "func new" + APPLE + "Iterator(things []*" + APPLE + ") *" + APPLE + "Iterator"
fmt.Fprintln(w, "// DEFINE THE", APPLE, "ITERATOR.")
fmt.Fprintln(w, "// itializes a new iterator.")
fmt.Fprintln(w, funcdef, "{")
fmt.Fprintln(w, " return &"+APPLE+"Iterator{things: things}")
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, "")
return funcdef
}
// maybe there are better ways in GO now adays // that's fine though. this is easy to read
// TODO; figure out what types this actually works on
// TODO; add timestamppb compare
func (msg *MsgName) newSortType(w io.Writer, STRUCT, VARNAME string) string {
// Can these be lower case? Should they be lower case? maybe sort.Sort() requires upper case?
fmt.Fprintln(w, "// sort struct by", VARNAME)
fmt.Fprintln(w, "type "+STRUCT+VARNAME+" []*"+STRUCT+"")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (a "+STRUCT+VARNAME+") Len() int { return len(a) }")
fmt.Fprintln(w, "func (a "+STRUCT+VARNAME+") Less(i, j int) bool { return a[i]."+VARNAME+" < a[j]."+VARNAME+" }")
fmt.Fprintln(w, "func (a "+STRUCT+VARNAME+") Swap(i, j int) { a[i], a[j] = a[j], a[i] }")
fmt.Fprintln(w, "")
return "type " + STRUCT + VARNAME + " []*" + STRUCT + " // { return a[i]." + VARNAME + " < a[j]." + VARNAME + " }"
}
func (msg *MsgName) newSortBy(w io.Writer, STRUCT, ITER, SORTNAME, SORTBY, SELECT, VARNAME string) string {
funcdef := "func (x *" + STRUCT + ") " + SORTBY + "() *" + ITER + "Iterator"
fmt.Fprintln(w, funcdef, "{")
fmt.Fprintln(w, " // copy the pointers as fast as possible.")
fmt.Fprintln(w, " things := x."+SELECT+"()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "// todo: try slices.SortFunc() instead to see what happens")
fmt.Fprintln(w, " sort.Sort("+SORTNAME+"(things))")
fmt.Fprintln(w, "// slices.SortFunc(things, func(a, b *"+STRUCT+") bool {")
fmt.Fprintln(w, "// return a."+VARNAME+" < b."+VARNAME+" // Sort by ??. let the compiler work it out??")
fmt.Fprintln(w, "// })")
// should this be 'new' or 'New' ? Does it matter? I think it's totally internal here
// in this file where it is "new or "New". I changed it to lower case 2025.01.12
fmt.Fprintln(w, " return new"+ITER+"Iterator(things)")
fmt.Fprintln(w, "}")
return funcdef
}
func (msg *MsgName) addAllFunc(w io.Writer, FRUIT, APPLE, APPLES string) string {
funcdef := "func (x *" + FRUIT + ") All() *" + APPLE + "Iterator {"
fmt.Fprintln(w, funcdef)
fmt.Fprintln(w, " "+APPLE+"Pointers := x.selectAll"+APPLES+"()")
fmt.Fprintln(w, "")
// should this be 'new' or 'New' ? Does it matter? I think it's totally internal here. I think there are only 3 places
// in this file where it is "new or "New". I changed it to lower case 2025.01.12
fmt.Fprintln(w, " iterator := new"+APPLE+"Iterator("+APPLE+"Pointers)")
fmt.Fprintln(w, " return iterator")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
return funcdef
}
func (msg *MsgName) addLenFunc(w io.Writer, FRUIT, APPLES, LOCKold string) string {
LOCK := msg.getLockname("x")
funcdef := "func (x *" + FRUIT + ") Len() int {"
fmt.Fprintln(w, "")
fmt.Fprintln(w, funcdef)
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, "")
return funcdef
}
func (msg *MsgName) addSelectAll(w io.Writer, FRUIT, APPLE, APPLES, LOCKold string) string {
LOCK := msg.getLockname("x")
funcdef := "func (x *" + FRUIT + ") selectAll" + APPLES + "() []*" + APPLE
fmt.Fprintln(w, "// safely returns a slice of pointers to the "+APPLE+" protobufs")
fmt.Fprintln(w, funcdef, "{")
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, "}")
return funcdef
}
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