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// Copyright 2017-2025 WIT.COM Inc. All rights reserved.
// Use of this source code is governed by the GPL 3.0
package main
import (
"fmt"
"io"
)
func (msg *MsgName) newScannerAll(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 newScannerDefines(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 + "Scanner(things []*" + APPLE + ") *" + APPLE + "Scanner"
fmt.Fprintln(w, "// DEFINE THE", APPLE, "SCANNER.")
fmt.Fprintln(w, "// itializes a new scanner.")
fmt.Fprintln(w, funcdef, "{")
fmt.Fprintln(w, " return &"+APPLE+"Scanner{things: things}")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "type "+APPLE+"Scanner struct {")
fmt.Fprintln(w, " sync.Mutex")
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+"Scanner) Scan() bool {")
fmt.Fprintln(w, " if it.index >= len(it.things) {")
fmt.Fprintln(w, " return false")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " it.Lock()")
fmt.Fprintln(w, " it.index++")
fmt.Fprintln(w, " it.Unlock()")
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+"Scanner) Next() *"+APPLE+" {")
fmt.Fprintln(w, " if it.things[it.index-1] == nil {")
fmt.Fprintln(w, " fmt.Println(\"Next() error in "+APPLE+"Scanner\", 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 SCANNER")
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 {
SORTNAME := "sort" + STRUCT + VARNAME
// 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 "+SORTNAME+" []*"+STRUCT+"")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "func (a "+SORTNAME+") Len() int { return len(a) }")
fmt.Fprintln(w, "func (a "+SORTNAME+") Less(i, j int) bool { return a[i]."+VARNAME+" < a[j]."+VARNAME+" }")
fmt.Fprintln(w, "func (a "+SORTNAME+") 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 + " }"
}
// provdes a sorted iter. Does not modify the protobuf
func (msg *MsgName) newSortBy(w io.Writer, STRUCT, ITER, SORTNAME, SORTBY, SELECT, VARNAME string) string {
funcdef := "func (x *" + STRUCT + ") " + SORTBY + "() *" + ITER + "Scanner"
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+"Scanner(things)")
fmt.Fprintln(w, "}")
return funcdef
}
// sorts the protobuf in place.
func (msg *MsgName) newSort(w io.Writer, STRUCT, FUNCNAME, SORTNAME, LOCK string) string {
funcdef := "func (pb *" + STRUCT + ") " + FUNCNAME + "() "
fmt.Fprintln(w, funcdef, "{")
fmt.Fprintln(w, " "+LOCK+".Lock()")
fmt.Fprintln(w, " defer "+LOCK+".Unlock()")
fmt.Fprintln(w, "")
fmt.Fprintln(w, " sort.Sort("+SORTNAME+"(pb."+STRUCT+"))")
fmt.Fprintln(w, "}")
return funcdef
}
func (msg *MsgName) addIterAllFunc(w io.Writer, FRUIT, APPLE, APPLES string) string {
funcdef := "func (x *" + FRUIT + ") All() *" + APPLE + "Scanner {"
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, " scanner := new"+APPLE+"Scanner("+APPLE+"Pointers)")
fmt.Fprintln(w, " return scanner")
fmt.Fprintln(w, "}")
fmt.Fprintln(w, "")
return funcdef
}
func (msg *MsgName) addIterBy(w io.Writer, FRUITS, FRUIT, APPLE, SORTNAME string) string {
fmt.Fprintln(w, "// 'for x := range' syntax using the awesome golang 1.24 'iter'")
fmt.Fprintln(w, "func (x *"+FRUITS+") IterBy"+APPLE+"() iter.Seq[*"+FRUIT+"] {")
fmt.Fprintln(w, " items := x.selectAll"+FRUITS+"()")
fmt.Fprintln(w, " sort.Sort("+SORTNAME+"(items))")
fmt.Fprintln(w, " // log.Println(\"Made Iter.Seq[] with length\", len(items))")
fmt.Fprintln(w, " return func(yield func(*"+FRUIT+") bool) {")
fmt.Fprintln(w, " for _, v := range items {")
fmt.Fprintln(w, " if !yield(v) {")
fmt.Fprintln(w, " return")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, "}")
return ""
}
func (msg *MsgName) addIterAll(w io.Writer, FRUITS, FRUIT string) string {
funcdef := "func (x *" + FRUITS + ") IterAll() iter.Seq[*" + FRUIT + "] {"
fmt.Fprintln(w, "// Iterate 'for x := range' syntax using the awesome golang 1.24 'iter'")
fmt.Fprintln(w, funcdef)
fmt.Fprintln(w, " items := x.selectAll"+FRUITS+"()")
fmt.Fprintln(w, " // log.Println(\"Made All() Iter.Seq[] with length\", len(items))")
fmt.Fprintln(w, " return func(yield func(*"+FRUIT+") bool) {")
fmt.Fprintln(w, " for _, v := range items {")
fmt.Fprintln(w, " if !yield(v) {")
fmt.Fprintln(w, " return")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, " }")
fmt.Fprintln(w, "}")
return funcdef
}
func (msg *MsgName) addAllFunc(w io.Writer, FRUIT, APPLE, APPLES string) string {
funcdef := "func (x *" + FRUIT + ") All() *" + APPLE + "Scanner {"
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, " scanner := new"+APPLE+"Scanner("+APPLE+"Pointers)")
fmt.Fprintln(w, " return scanner")
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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