goext/bfcodegen/enum-generate.go
Mike Schwörer 2fad6340c7
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v0.0.334 allow dot in enum-value
2023-12-05 19:23:27 +01:00

232 lines
5.9 KiB
Go

package bfcodegen
import (
"bytes"
_ "embed"
"errors"
"fmt"
"go/format"
"gogs.mikescher.com/BlackForestBytes/goext"
"gogs.mikescher.com/BlackForestBytes/goext/cryptext"
"gogs.mikescher.com/BlackForestBytes/goext/langext"
"gogs.mikescher.com/BlackForestBytes/goext/rext"
"io"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"text/template"
)
type EnumDefVal struct {
VarName string
Value string
Description *string
}
type EnumDef struct {
File string
FileRelative string
EnumTypeName string
Type string
Values []EnumDefVal
}
var rexEnumPackage = rext.W(regexp.MustCompile(`^package\s+(?P<name>[A-Za-z0-9_]+)\s*$`))
var rexEnumDef = rext.W(regexp.MustCompile(`^\s*type\s+(?P<name>[A-Za-z0-9_]+)\s+(?P<type>[A-Za-z0-9_]+)\s*//\s*(@enum:type).*$`))
var rexEnumValueDef = rext.W(regexp.MustCompile(`^\s*(?P<name>[A-Za-z0-9_]+)\s+(?P<type>[A-Za-z0-9_]+)\s*=\s*(?P<value>("[A-Za-z0-9_:\s\-.]+"|[0-9]+))\s*(//(?P<descr>.*))?.*$`))
var rexEnumChecksumConst = rext.W(regexp.MustCompile(`const ChecksumEnumGenerator = "(?P<cs>[A-Za-z0-9_]*)"`))
//go:embed enum-generate.template
var templateEnumGenerateText string
func GenerateEnumSpecs(sourceDir string, destFile string) error {
files, err := os.ReadDir(sourceDir)
if err != nil {
return err
}
oldChecksum := "N/A"
if _, err := os.Stat(destFile); !os.IsNotExist(err) {
content, err := os.ReadFile(destFile)
if err != nil {
return err
}
if m, ok := rexEnumChecksumConst.MatchFirst(string(content)); ok {
oldChecksum = m.GroupByName("cs").Value()
}
}
files = langext.ArrFilter(files, func(v os.DirEntry) bool { return v.Name() != path.Base(destFile) })
files = langext.ArrFilter(files, func(v os.DirEntry) bool { return strings.HasSuffix(v.Name(), ".go") })
files = langext.ArrFilter(files, func(v os.DirEntry) bool { return !strings.HasSuffix(v.Name(), "_gen.go") })
langext.SortBy(files, func(v os.DirEntry) string { return v.Name() })
newChecksumStr := goext.GoextVersion
for _, f := range files {
content, err := os.ReadFile(path.Join(sourceDir, f.Name()))
if err != nil {
return err
}
newChecksumStr += "\n" + f.Name() + "\t" + cryptext.BytesSha256(content)
}
newChecksum := cryptext.BytesSha256([]byte(newChecksumStr))
if newChecksum != oldChecksum {
fmt.Printf("[EnumGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
} else {
fmt.Printf("[EnumGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
return nil
}
allEnums := make([]EnumDef, 0)
pkgname := ""
for _, f := range files {
fmt.Printf("========= %s =========\n\n", f.Name())
fileEnums, pn, err := processEnumFile(sourceDir, path.Join(sourceDir, f.Name()))
if err != nil {
return err
}
fmt.Printf("\n")
allEnums = append(allEnums, fileEnums...)
if pn != "" {
pkgname = pn
}
}
if pkgname == "" {
return errors.New("no package name found in any file")
}
fdata, err := format.Source([]byte(fmtEnumOutput(newChecksum, allEnums, pkgname)))
if err != nil {
return err
}
err = os.WriteFile(destFile, fdata, 0o755)
if err != nil {
return err
}
return nil
}
func processEnumFile(basedir string, fn string) ([]EnumDef, string, error) {
file, err := os.Open(fn)
if err != nil {
return nil, "", err
}
defer func() { _ = file.Close() }()
bin, err := io.ReadAll(file)
if err != nil {
return nil, "", err
}
lines := strings.Split(string(bin), "\n")
enums := make([]EnumDef, 0)
pkgname := ""
for i, line := range lines {
if i == 0 && strings.HasPrefix(line, "// Code generated by") {
break
}
if match, ok := rexEnumPackage.MatchFirst(line); i == 0 && ok {
pkgname = match.GroupByName("name").Value()
continue
}
if match, ok := rexEnumDef.MatchFirst(line); ok {
rfp, err := filepath.Rel(basedir, fn)
if err != nil {
return nil, "", err
}
def := EnumDef{
File: fn,
FileRelative: rfp,
EnumTypeName: match.GroupByName("name").Value(),
Type: match.GroupByName("type").Value(),
Values: make([]EnumDefVal, 0),
}
enums = append(enums, def)
fmt.Printf("Found enum definition { '%s' -> '%s' }\n", def.EnumTypeName, def.Type)
}
if match, ok := rexEnumValueDef.MatchFirst(line); ok {
typename := match.GroupByName("type").Value()
def := EnumDefVal{
VarName: match.GroupByName("name").Value(),
Value: match.GroupByName("value").Value(),
Description: match.GroupByNameOrEmpty("descr").ValueOrNil(),
}
found := false
for i, v := range enums {
if v.EnumTypeName == typename {
enums[i].Values = append(enums[i].Values, def)
found = true
if def.Description != nil {
fmt.Printf("Found enum value [%s] for '%s' ('%s')\n", def.Value, def.VarName, *def.Description)
} else {
fmt.Printf("Found enum value [%s] for '%s'\n", def.Value, def.VarName)
}
break
}
}
if !found {
fmt.Printf("Found non-enum value [%s] for '%s' ( looks like enum value, but no matching @enum:type )\n", def.Value, def.VarName)
}
}
}
return enums, pkgname, nil
}
func fmtEnumOutput(cs string, enums []EnumDef, pkgname string) string {
templ := template.New("enum-generate")
templ = templ.Funcs(template.FuncMap{
"boolToStr": func(b bool) string { return langext.Conditional(b, "true", "false") },
"deref": func(v *string) string { return *v },
"trimSpace": func(str string) string { return strings.TrimSpace(str) },
"hasStr": func(v EnumDef) bool { return v.Type == "string" },
"hasDescr": func(v EnumDef) bool {
return langext.ArrAll(v.Values, func(val EnumDefVal) bool { return val.Description != nil })
},
})
templ = template.Must(templ.Parse(templateEnumGenerateText))
buffer := bytes.Buffer{}
err := templ.Execute(&buffer, langext.H{
"PkgName": pkgname,
"Checksum": cs,
"GoextVersion": goext.GoextVersion,
"Enums": enums,
})
if err != nil {
panic(err)
}
return buffer.String()
}