goext/bfcodegen/id-generate.go

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package bfcodegen
import (
"bytes"
_ "embed"
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"errors"
"fmt"
"go/format"
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"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"
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)
type IDDef struct {
File string
FileRelative string
Name string
}
var rexIDPackage = rext.W(regexp.MustCompile(`^package\s+(?P<name>[A-Za-z0-9_]+)\s*$`))
var rexIDDef = rext.W(regexp.MustCompile(`^\s*type\s+(?P<name>[A-Za-z0-9_]+)\s+string\s*//\s*(@id:type).*$`))
var rexIDChecksumConst = rext.W(regexp.MustCompile(`const ChecksumIDGenerator = "(?P<cs>[A-Za-z0-9_]*)"`))
//go:embed id-generate.template
var templateIDGenerateText string
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func GenerateIDSpecs(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 := rexIDChecksumConst.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") })
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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("[IDGenerate] Checksum has changed ( %s -> %s ), will generate new file\n\n", oldChecksum, newChecksum)
} else {
fmt.Printf("[IDGenerate] Checksum unchanged ( %s ), nothing to do\n", oldChecksum)
return nil
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}
allIDs := make([]IDDef, 0)
pkgname := ""
for _, f := range files {
fmt.Printf("========= %s =========\n\n", f.Name())
fileIDs, pn, err := processIDFile(sourceDir, path.Join(sourceDir, f.Name()))
if err != nil {
return err
}
fmt.Printf("\n")
allIDs = append(allIDs, fileIDs...)
if pn != "" {
pkgname = pn
}
}
if pkgname == "" {
return errors.New("no package name found in any file")
}
fdata, err := format.Source([]byte(fmtIDOutput(newChecksum, allIDs, pkgname)))
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if err != nil {
return err
}
err = os.WriteFile(destFile, fdata, 0o755)
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if err != nil {
return err
}
return nil
}
func processIDFile(basedir string, fn string) ([]IDDef, 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")
ids := make([]IDDef, 0)
pkgname := ""
for i, line := range lines {
if i == 0 && strings.HasPrefix(line, "// Code generated by") {
break
}
if match, ok := rexIDPackage.MatchFirst(line); i == 0 && ok {
pkgname = match.GroupByName("name").Value()
continue
}
if match, ok := rexIDDef.MatchFirst(line); ok {
rfp, err := filepath.Rel(basedir, fn)
if err != nil {
return nil, "", err
}
def := IDDef{
File: fn,
FileRelative: rfp,
Name: match.GroupByName("name").Value(),
}
fmt.Printf("Found ID definition { '%s' }\n", def.Name)
ids = append(ids, def)
}
}
return ids, pkgname, nil
}
func fmtIDOutput(cs string, ids []IDDef, pkgname string) string {
templ := template.Must(template.New("id-generate").Parse(templateIDGenerateText))
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buffer := bytes.Buffer{}
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anyDef := langext.ArrFirstOrNil(ids, func(def IDDef) bool { return def.Name == "AnyID" || def.Name == "AnyId" })
err := templ.Execute(&buffer, langext.H{
"PkgName": pkgname,
"Checksum": cs,
"GoextVersion": goext.GoextVersion,
"IDs": ids,
"AnyDef": anyDef,
})
if err != nil {
panic(err)
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}
return buffer.String()
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}