autogenpb/protoParse.go

package main

// auto run protoc with the correct args

import (
	"os"
	"strings"

	"go.wit.com/log"
	"golang.org/x/text/cases"
	"golang.org/x/text/language"
)

// this parses the .proto file and handles anything with `autogenpb: `

// finds autogenpb:marshal and autogenpb:unique in the .proto file
//
//	adds fields to []marshal and []unique
func (pb *Files) findAutogenpb(f *File) error {
	// log.Info("starting findAutogenpb() on", names["protofile"])
	// read in the .proto file
	data, err := os.ReadFile(f.Filename)
	if err != nil {
		// log.Info("open config file :", err)
		return err
	}

	var curmsg *MsgName

	// parse the proto file for message struct names
	for _, line := range strings.Split(string(data), "\n") {
		if strings.HasPrefix(line, "message ") {
			curmsg = f.parseForMessage(line)
		}
		if strings.HasPrefix(line, "}") {
			curmsg = nil
		}

		// log.Info("line:", line)
		parts := strings.Fields(line)

		if strings.Contains(line, "autogenpb:sort") {
			if parts[0] == "repeated" {
				newm := parts[1]
				if curmsg == nil {
					log.Info("Error: Found Sort for:", newm, "however, this struct can't be used")
				} else {
					log.Info("Found Sort for:", newm, "in struct", curmsg.Name)
				}
			} else {
				log.Info("Error:", line)
				log.Info("Error: can not sort on non repeated fields")
			}
		}
		if strings.Contains(line, "autogenpb:unique") {
			if parts[0] == "repeated" {
				newu := parts[1]
				newu = cases.Title(language.English, cases.NoLower).String(newu)
				log.Info("Found unique field", newu, "in struct", curmsg.Name)
			} else {
				log.Info("Error:", line)
				log.Info("Error: can not append on non repeated fields")
			}
		}
	}
	return nil
}

// looks for mutex and marshal entries
func (f *File) parseForMessage(line string) *MsgName {
	fields := strings.Fields(line)
	if fields[0] != "message" {
		return nil
	}
	msgName := fields[1]
	msg := new(MsgName)
	f.MsgNames = append(f.MsgNames, msg)
	msg.Name = msgName

	if strings.Contains(line, "`autogenpb:mutex`") {
		msg.DoMutex = true
		log.Info("Added Mutex=true:", msg.Name)
	}
	if strings.Contains(line, "`autogenpb:marshal`") {
		msg.DoMarshal = true
		log.Info("Added Marshal=true:", msg.Name)
	}
	return msg
}

func (pb *Files) findGlobalAutogenpb(f *File) error {
	// log.Info("starting findAutogenpb() on", filename)
	// read in the .proto file
	data, err := os.ReadFile(f.Filename)
	if err != nil {
		// log.Info("open config file :", err)
		return err
	}

	lines := strings.Split(string(data), "\n")
	for _, line := range lines {
		if strings.Contains(line, "autogenpb:ignoreproto") {
			// ignore this protofile completely (don't make foo.pb.go)
			os.Exit(0)
		}
		if strings.Contains(line, "autogenpb:no-marshal") {
			// don't marshal anything (don't make foo.marshal.pb.go)
			argv.NoMarshal = true
		}
		if strings.Contains(line, "autogenpb:no-sort") {
			// don't sort anything (don't make foo.sort.pb.go)
			argv.NoSort = true
		}
		if strings.Contains(line, "autogenpb:mutex") {
			// try the mutex hack
			argv.Mutex = true
		}
		if strings.Contains(line, "autogenpb:gover:") {
			// todo: parse the output here
			parts := strings.Split(line, "autogenpb:gover:")
			log.Info("found gover:", parts[1])
			argv.Mutex = true
		}
	}
	return nil
}