v0.0.294 migrate bfcodegen to templates
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@@ -1,6 +1,8 @@
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package bfcodegen
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import (
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"bytes"
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_ "embed"
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"errors"
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"fmt"
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"gogs.mikescher.com/BlackForestBytes/goext"
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@@ -14,6 +16,7 @@ import (
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"path/filepath"
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"regexp"
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"strings"
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"text/template"
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"time"
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)
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@@ -30,6 +33,9 @@ var rexCSIDDef = rext.W(regexp.MustCompile(`^\s*type\s+(?P<name>[A-Za-z0-9_]+)\s
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var rexCSIDChecksumConst = rext.W(regexp.MustCompile(`const ChecksumCharsetIDGenerator = "(?P<cs>[A-Za-z0-9_]*)"`))
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//go:embed csid-generate.template
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var templateCSIDGenerateText string
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func GenerateCharsetIDSpecs(sourceDir string, destFile string) error {
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files, err := os.ReadDir(sourceDir)
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@@ -168,198 +174,19 @@ func processCSIDFile(basedir string, fn string) ([]CSIDDef, string, error) {
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}
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func fmtCSIDOutput(cs string, ids []CSIDDef, pkgname string) string {
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str := "// Code generated by id-generate.go DO NOT EDIT.\n"
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str += "\n"
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str += "package " + pkgname + "\n"
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str += "\n"
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templ := template.Must(template.New("csid-generate").Parse(templateCSIDGenerateText))
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str += `import "crypto/rand"` + "\n"
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str += `import "fmt"` + "\n"
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str += `import "github.com/go-playground/validator/v10"` + "\n"
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str += `import "github.com/rs/zerolog/log"` + "\n"
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str += `import "gogs.mikescher.com/BlackForestBytes/goext/exerr"` + "\n"
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str += `import "gogs.mikescher.com/BlackForestBytes/goext/langext"` + "\n"
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str += `import "gogs.mikescher.com/BlackForestBytes/goext/rext"` + "\n"
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str += `import "math/big"` + "\n"
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str += `import "reflect"` + "\n"
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str += `import "regexp"` + "\n"
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str += `import "strings"` + "\n"
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str += "\n"
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str += "const ChecksumCharsetIDGenerator = \"" + cs + "\" // GoExtVersion: " + goext.GoextVersion + "\n"
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str += "\n"
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str += "const idlen = 24\n"
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str += "\n"
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str += "const checklen = 1\n"
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str += "\n"
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str += `const idCharset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"` + "\n"
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str += "const idCharsetLen = len(idCharset)\n"
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str += "\n"
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str += "var charSetReverseMap = generateCharsetMap()\n"
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str += "\n"
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str += "const (\n"
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for _, iddef := range ids {
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str += " prefix" + iddef.Name + " = \"" + iddef.Prefix + "\"" + "\n"
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}
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str += ")\n"
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str += "\n"
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str += "var (\n"
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for _, iddef := range ids {
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str += " regex" + iddef.Name + " = generateRegex(prefix" + iddef.Name + ")" + "\n"
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}
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str += ")\n"
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str += "\n"
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str += "func generateRegex(prefix string) rext.Regex {\n"
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str += " return rext.W(regexp.MustCompile(fmt.Sprintf(\"^%s[%s]{%d}[%s]{%d}$\", prefix, idCharset, idlen-len(prefix)-checklen, idCharset, checklen)))\n"
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str += "}\n"
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str += "\n"
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str += `func generateCharsetMap() []int {` + "\n"
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str += ` result := make([]int, 128)` + "\n"
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str += ` for i := 0; i < len(result); i++ {` + "\n"
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str += ` result[i] = -1` + "\n"
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str += ` }` + "\n"
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str += ` for idx, chr := range idCharset {` + "\n"
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str += ` result[int(chr)] = idx` + "\n"
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str += ` }` + "\n"
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str += ` return result` + "\n"
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str += `}` + "\n"
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str += "\n"
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str += `func generateID(prefix string) string {` + "\n"
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str += ` k := ""` + "\n"
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str += ` max := big.NewInt(int64(idCharsetLen))` + "\n"
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str += ` checksum := 0` + "\n"
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str += ` for i := 0; i < idlen-len(prefix)-checklen; i++ {` + "\n"
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str += ` v, err := rand.Int(rand.Reader, max)` + "\n"
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str += ` if err != nil {` + "\n"
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str += ` panic(err)` + "\n"
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str += ` }` + "\n"
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str += ` v64 := v.Int64()` + "\n"
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str += ` k += string(idCharset[v64])` + "\n"
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str += ` checksum = (checksum + int(v64)) % (idCharsetLen)` + "\n"
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str += ` }` + "\n"
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str += ` checkstr := string(idCharset[checksum%idCharsetLen])` + "\n"
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str += ` return prefix + k + checkstr` + "\n"
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str += `}` + "\n"
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str += "\n"
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str += `func validateID(prefix string, value string) error {` + "\n"
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str += ` if len(value) != idlen {` + "\n"
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str += ` return exerr.New(exerr.TypeInvalidCSID, "id has the wrong length").Str("value", value).Build()` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` if !strings.HasPrefix(value, prefix) {` + "\n"
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str += ` return exerr.New(exerr.TypeInvalidCSID, "id is missing the correct prefix").Str("value", value).Str("prefix", prefix).Build()` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` checksum := 0` + "\n"
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str += ` for i := len(prefix); i < len(value)-checklen; i++ {` + "\n"
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str += ` ichr := int(value[i])` + "\n"
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str += ` if ichr < 0 || ichr >= len(charSetReverseMap) || charSetReverseMap[ichr] == -1 {` + "\n"
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str += ` return exerr.New(exerr.TypeInvalidCSID, "id contains invalid characters").Str("value", value).Build()` + "\n"
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str += ` }` + "\n"
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str += ` checksum = (checksum + charSetReverseMap[ichr]) % (idCharsetLen)` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` checkstr := string(idCharset[checksum%idCharsetLen])` + "\n"
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str += "\n"
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str += ` if !strings.HasSuffix(value, checkstr) {` + "\n"
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str += ` return exerr.New(exerr.TypeInvalidCSID, "id checkstring is invalid").Str("value", value).Str("checkstr", checkstr).Build()` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` return nil` + "\n"
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str += `}` + "\n"
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str += "\n"
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str += `func getRawData(prefix string, value string) string {` + "\n"
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str += ` if len(value) != idlen {` + "\n"
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str += ` return ""` + "\n"
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str += ` }` + "\n"
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str += ` return value[len(prefix) : idlen-checklen]` + "\n"
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str += `}` + "\n"
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str += "\n"
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str += `func getCheckString(prefix string, value string) string {` + "\n"
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str += ` if len(value) != idlen {` + "\n"
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str += ` return ""` + "\n"
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str += ` }` + "\n"
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str += ` return value[idlen-checklen:]` + "\n"
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str += `}` + "\n"
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str += "\n"
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str += `func ValidateEntityID(vfl validator.FieldLevel) bool {` + "\n"
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str += ` if !vfl.Field().CanInterface() {` + "\n"
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str += ` log.Error().Msgf("Failed to validate EntityID (cannot interface ?!?)")` + "\n"
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str += ` return false` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` ifvalue := vfl.Field().Interface()` + "\n"
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str += "\n"
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str += ` if value1, ok := ifvalue.(EntityID); ok {` + "\n"
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str += "\n"
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str += ` if vfl.Field().Type().Kind() == reflect.Pointer && langext.IsNil(value1) {` + "\n"
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str += ` return true` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` if err := value1.Valid(); err != nil {` + "\n"
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str += ` log.Debug().Msgf("Failed to validate EntityID '%s' (%s)", value1.String(), err.Error())` + "\n"
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str += ` return false` + "\n"
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str += ` } else {` + "\n"
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str += ` return true` + "\n"
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str += ` }` + "\n"
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str += "\n"
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str += ` } else {` + "\n"
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str += ` log.Error().Msgf("Failed to validate EntityID (wrong type: %T)", ifvalue)` + "\n"
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str += ` return false` + "\n"
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str += ` }` + "\n"
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str += `}` + "\n"
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str += "\n"
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for _, iddef := range ids {
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str += "// ================================ " + iddef.Name + " (" + iddef.FileRelative + ") ================================" + "\n"
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str += "" + "\n"
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str += "func New" + iddef.Name + "() " + iddef.Name + " {" + "\n"
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str += " return " + iddef.Name + "(generateID(prefix" + iddef.Name + "))" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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str += "func (id " + iddef.Name + ") Valid() error {" + "\n"
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str += " return validateID(prefix" + iddef.Name + ", string(id))" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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str += "func (i " + iddef.Name + ") String() string {" + "\n"
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str += " return string(i)" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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str += "func (i " + iddef.Name + ") Prefix() string {" + "\n"
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str += " return prefix" + iddef.Name + "" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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str += "func (id " + iddef.Name + ") Raw() string {" + "\n"
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str += " return getRawData(prefix" + iddef.Name + ", string(id))" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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str += "func (id " + iddef.Name + ") CheckString() string {" + "\n"
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str += " return getCheckString(prefix" + iddef.Name + ", string(id))" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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str += "func (id " + iddef.Name + ") Regex() rext.Regex {" + "\n"
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str += " return regex" + iddef.Name + "" + "\n"
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str += "}" + "\n"
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str += "" + "\n"
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buffer := bytes.Buffer{}
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err := templ.Execute(&buffer, langext.H{
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"PkgName": pkgname,
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"Checksum": cs,
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"GoextVersion": goext.GoextVersion,
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"IDs": ids,
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})
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if err != nil {
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panic(err)
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}
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return str
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return buffer.String()
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}
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