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generator.go
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generator.go
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// Copyright 2020 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0
package generator
import (
"bufio"
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"regexp"
"strings"
"github.com/iotaledger/wasp/tools/schema/model"
)
// TODO nested structs
// TODO handle case where owner is type AgentID[]
type IGenerator interface {
Build() error
Cleanup()
GenerateImplementation() error
GenerateInterface() error
GenerateTests() error
GenerateWasmStub() error
IsLatest() bool
}
type Generator struct {
currentEvent *model.Struct
currentField *model.Field
currentFunc *model.Func
currentStruct *model.Struct
emitters map[string]func(g *Generator)
extension string
file *os.File
folder string
funcRegexp *regexp.Regexp
keys model.StringMap
language string
newTypes map[string]bool
path string
rootFolder string
s *model.Schema
subFolder string
tab int
templates model.StringMap
tmp bool
typeDependent model.StringMapMap
}
const spaces = " "
func (g *Generator) init(s *model.Schema, typeDependent model.StringMapMap, templates []map[string]string) {
g.s = s
g.typeDependent = typeDependent
g.emitters = map[string]func(g *Generator){}
g.keys = model.StringMap{}
g.newTypes = map[string]bool{}
g.templates = model.StringMap{}
config := templates[0]
g.language = config["language"]
g.extension = config["extension"]
g.rootFolder = config["rootFolder"]
g.subFolder = config["subFolder"]
g.funcRegexp = regexp.MustCompile(config["funcRegexp"])
g.addTemplates(commonTemplates)
for _, template := range templates {
g.addTemplates(template)
}
g.setCommonKeys()
}
func (g *Generator) addTemplates(t model.StringMap) {
for k, v := range t {
g.templates[k] = v
}
}
func (g *Generator) build(compiler string, args string) error {
command := compiler
cmd := exec.Command(command, strings.Split(args, " ")...)
var stdout strings.Builder
cmd.Stdout = &stdout
cmd.Stderr = &stdout
err := cmd.Run()
if err != nil {
fmt.Println(stdout.String())
return errors.New("build failed")
}
return err
}
func (g *Generator) cleanCommonFiles() {
g.generateCommonFolder("", false)
g.cleanFolder(g.folder)
g.generateCommonFolder("impl", true)
g.cleanSourceFile("thunks")
g.cleanSourceFile("../main")
g.cleanFolder(g.folder + "../pkg")
}
func (g *Generator) cleanFolder(folder string) {
_ = os.RemoveAll(folder)
_ = os.Remove(folder)
}
func (g *Generator) cleanSourceFile(name string) {
path := g.folder + name + g.extension
_ = os.Remove(path)
}
func (g *Generator) cleanSourceFileIfSame(generator func() error) {
g.tmp = true
err := generator()
g.tmp = false
if err != nil {
panic(err)
}
newFile, err := os.ReadFile(g.path + ".tmp")
_ = os.Remove(g.path + ".tmp")
if err != nil {
panic(err)
}
oldFile, _ := os.ReadFile(g.path)
if bytes.Equal(oldFile, newFile) {
_ = os.Remove(g.path)
}
}
func (g *Generator) createFile(path string, overwrite bool, generator func()) (err error) {
g.path = path
if g.tmp {
path += ".tmp"
}
if !overwrite && g.exists(path) == nil {
return nil
}
g.file, err = os.Create(path)
if err != nil {
return err
}
defer func() { _ = g.file.Close() }()
generator()
return nil
}
func (g *Generator) createSourceFile(name string, mustExist bool, macro ...string) error {
path := g.folder + name + g.extension
if !mustExist {
_ = os.Remove(path)
return nil
}
if len(macro) == 1 {
name = macro[0]
}
return g.createFile(path, true, func() {
g.emit("warning")
g.emit("copyrightMessage")
g.emit(name + g.extension)
})
}
func (g *Generator) error(what string) {
g.println("???:" + what)
}
func (g *Generator) exists(path string) (err error) {
_, err = os.Stat(path)
return err
}
func (g *Generator) funcName(f *model.Func) string {
name := f.Kind + capitalize(f.Name)
if g.language == "Rust" {
name = snake(name)
}
return name
}
func (g *Generator) generateCommonFolder(postfix string, withSubFolder bool) {
g.folder = g.rootFolder + "/" + g.s.PackageName + postfix + "/"
if g.s.CoreContracts {
g.folder = g.rootFolder + "/wasmlib/" + g.s.PackageName + "/"
}
if withSubFolder && g.subFolder != "" {
g.folder += g.subFolder + "/"
if g.s.CoreContracts {
g.folder = g.subFolder + "/" + g.s.PackageName + "/"
}
}
}
func (g *Generator) generateFuncs() error {
scFileName := g.folder + "funcs" + g.extension
if g.exists(scFileName) != nil {
// generate initial SC function file
return g.createFile(scFileName, false, func() {
g.emit("copyrightMessage")
g.emit("funcs" + g.extension)
})
}
// append missing SC functions to existing code file
// scan existing file for function names
existing := make(model.StringMap)
lines := make([]string, 0)
err := g.scanExistingCode(scFileName, &existing, &lines)
if err != nil {
return err
}
// save old one from overwrite
scOriginal := g.folder + "funcs.bak"
err = os.Rename(scFileName, scOriginal)
if err != nil {
return err
}
err = g.createFile(scFileName, false, func() {
// make copy of original file
for _, line := range lines {
g.println(line)
}
// append any new funcs
for _, g.currentFunc = range g.s.Funcs {
if existing[g.funcName(g.currentFunc)] == "" {
g.setFuncKeys(false, 0, 0)
g.emit("funcSignature")
}
}
})
if err != nil {
return err
}
return os.Remove(scOriginal)
}
func (g *Generator) generateImplementation() error {
g.generateCommonFolder("impl", true)
err := os.MkdirAll(g.folder, 0o755)
if err != nil {
return err
}
err = g.createSourceFile("thunks", true)
if err != nil {
return err
}
return g.generateFuncs()
}
func (g *Generator) generateInterface() error {
err := os.MkdirAll(g.folder, 0o755)
if err != nil {
return err
}
err = g.createSourceFile("consts", true)
if err != nil {
return err
}
err = g.createSourceFile("events", !g.s.CoreContracts && len(g.s.Events) != 0)
if err != nil {
return err
}
err = g.createSourceFile("eventhandlers", len(g.s.Events) != 0)
if err != nil {
return err
}
err = g.createSourceFile("structs", len(g.s.Structs) != 0)
if err != nil {
return err
}
err = g.createSourceFile("typedefs", len(g.s.Typedefs) != 0)
if err != nil {
return err
}
err = g.createSourceFile("params", len(g.s.Params) != 0)
if err != nil {
return err
}
err = g.createSourceFile("results", len(g.s.Results) != 0)
if err != nil {
return err
}
err = g.createSourceFile("state", !g.s.CoreContracts && len(g.s.StateVars) != 0)
if err != nil {
return err
}
return g.createSourceFile("contract", true)
}
func (g *Generator) GenerateTests() error {
err := os.MkdirAll("test", 0o755)
if err != nil {
return err
}
// do not overwrite existing file
name := strings.ToLower(g.s.PackageName)
filename := "test/" + name + "_test.go"
return g.createFile(filename, false, func() {
g.emit("test.go")
})
}
func (g *Generator) IsLatest() bool {
g.generateCommonFolder("", true)
info, err := os.Stat(g.folder + "consts" + g.extension)
if err == nil && info.ModTime().After(g.s.SchemaTime) {
// fmt.Printf("skipping %s code generation\n", g.language)
return true
}
fmt.Printf("generating %s code\n", g.language)
return false
}
func (g *Generator) openFile(path string, processor func() error) (err error) {
g.file, err = os.Open(path)
if err != nil {
return err
}
defer func() { _ = g.file.Close() }()
return processor()
}
func (g *Generator) println(a ...interface{}) {
_, _ = fmt.Fprintln(g.file, a...)
}
func (g *Generator) scanExistingCode(path string, existing *model.StringMap, lines *[]string) error {
return g.openFile(path, func() error {
scanner := bufio.NewScanner(g.file)
for scanner.Scan() {
line := scanner.Text()
matches := g.funcRegexp.FindStringSubmatch(line)
if matches != nil {
(*existing)[matches[1]] = line
}
*lines = append(*lines, line)
}
return scanner.Err()
})
}