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generate.go
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generate.go
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package build
import (
"bytes"
"fmt"
"go/format"
"os"
"path/filepath"
"sort"
"strings"
"text/template"
"github.com/wsxiaoys/terminal/color"
"golang.org/x/text/cases"
"golang.org/x/text/language"
)
// GenerateGo generates a Go source representation of ZoneDB.
func GenerateGo(zones map[string]*Zone) error {
tlds := TLDs(zones)
domains := SortedDomains(zones)
offsets := make(map[string]int, len(domains))
tagSet := NewSet()
for i, d := range domains {
offsets[d] = i
z := zones[d]
tagSet.Add(z.Tags...)
}
tags := tagSet.Values()
sort.Strings(tags)
tagValues := make(map[string]uint64)
for i, t := range tags {
tagValues[t] = 1 << uint64(i)
}
tagType := "uint32"
if len(tags) > 32 {
tagType = "uint64"
}
for _, d := range domains {
z := zones[d]
z.Normalize() // just in case
z.ParentOffset = offsets[z.ParentDomain()]
if len(z.subdomains) > 0 {
z.SubdomainsOffset = offsets[z.subdomains[0]]
z.SubdomainsEnd = z.SubdomainsOffset + len(z.subdomains)
}
z.TagBits = tagBits(tagValues, z.Tags)
}
data := templateData{
Zones: zones,
TLDs: tlds,
Domains: domains,
Offsets: offsets,
TagType: tagType,
Tags: tags,
TagValues: tagValues,
Strings: []string{},
}
// Pre-index 2-letter pairs
var pairs string
const alphabet = "abcdefghijklmnopqrstuvwxyz"
for _, i := range alphabet {
for _, j := range alphabet {
s := string(i) + string(j)
if strings.Contains(pairs, s) {
continue
}
if len(pairs) > 0 && pairs[len(pairs)-1] == s[0] {
pairs = pairs + s[1:]
} else {
pairs = pairs + s
}
}
}
data.indexedString(pairs)
// Pre-index strings and string slices
set := NewSet()
for _, z := range zones {
set.Add(ToASCII(z.WhoisServer))
set.Add(ToASCIIURL(z.WhoisURL))
set.Add(ToASCIIURL(z.InfoURL))
}
// Sort by length desc, then alphabetically asc
all := set.Values()
sort.Slice(all, func(i, j int) bool {
if len(all[i]) == len(all[j]) {
return all[i] < all[j]
}
return len(all[i]) > len(all[j])
})
for _, s := range all {
data.indexedString(s)
}
for _, d := range domains {
data.domainStringSlice(zones[d].NameServers)
}
for _, d := range domains {
data.domainStringSlice(zones[d].Wildcards)
}
for _, d := range domains {
data.indexedStringSlice(zones[d].Locations)
}
for _, d := range domains {
data.indexedStringSlice(zones[d].Languages)
}
// Add domains last, as these are most likely to be the shortest strings
for i := range domains {
data.domainString(domains[len(domains)-i-1])
}
err := generate("zones.go", zonesGoSrc, &data)
if err != nil {
return err
}
return nil
}
type templateData struct {
Zones map[string]*Zone
TLDs map[string]*Zone
Domains []string
Offsets map[string]int
TagType string
Tags []string
TagValues map[string]uint64
Strings []string
}
func (data *templateData) indexedString(s string) string {
if s == "" {
return "e"
}
i, j, k := IndexOrAppendString(&data.Strings, s)
if j == 0 && k == len(data.Strings[i]) {
return fmt.Sprintf("s[%d]", i)
} else if j == 0 {
return fmt.Sprintf("s[%d][:%d]", i, k)
}
return fmt.Sprintf("s[%d][%d:%d]", i, j, k)
}
func (data *templateData) indexedStringSlice(slice []string) string {
if len(slice) == 0 {
return "n"
}
// if len(slice) == 1 {
// return "[]string{" + data.indexedString(slice[0]) + "}"
// }
i, j := IndexOrAppendStrings(&data.Strings, slice)
return fmt.Sprintf("s[%d:%d]", i, j)
}
func (data *templateData) domainString(s string) string {
return data.indexedString(ToASCII(s))
}
func (data *templateData) domainStringSlice(slice []string) string {
needle := make([]string, len(slice))
for i := range slice {
needle[i] = ToASCII(slice[i])
}
return data.indexedStringSlice(needle)
}
func (data *templateData) urlString(s string) string {
return data.indexedString(ToASCIIURL(s))
}
func (data *templateData) urlStringSlice(slice []string) string {
needle := make([]string, len(slice))
for i := range slice {
needle[i] = ToASCIIURL(slice[i])
}
return data.indexedStringSlice(needle)
}
// identifier converts a kebab-case string to a Go identifier string.
func identifier(s string) string {
s = tagCaser.String(s)
return strings.ReplaceAll(s, "-", "")
}
var tagCaser = cases.Title(language.English)
func quoted(s string) string {
if s == "" {
return "e" // const e = ""
}
return fmt.Sprintf("%q", s)
}
func quotedDomain(s string) string {
return quoted(ToASCII(s))
}
func quotedURL(s string) string {
return quoted(ToASCIIURL(s))
}
func generate(filename, src string, data *templateData) error {
funcMap := template.FuncMap{
"identifier": identifier,
"quoted": quoted,
"quotedDomain": quotedDomain,
"quotedURL": quotedURL,
"string": data.indexedString,
"stringSlice": data.indexedStringSlice,
"domainString": data.domainString,
"domainSlice": data.domainStringSlice,
"urlString": data.urlString,
"urlSlice": data.urlStringSlice,
}
t := template.Must(template.New("").Funcs(funcMap).Parse(cont(src)))
buf := new(bytes.Buffer)
err := t.Execute(buf, data)
if err != nil {
return err
}
formatted, err := format.Source(buf.Bytes())
if err != nil {
return err
}
filename = filepath.Join(BaseDir, filename)
color.Fprintf(os.Stderr, "@{.}Generating Go source code: %s\n", filename)
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(formatted)
return err
}
func cont(s string) string {
return strings.ReplaceAll(s, "\\\n", "")
}
const zonesGoSrc = `// Automatically generated
package zonedb
func init() {
initZones() // Separate function to report allocs in initialization
}
func initZones() {
z = y
ZoneMap = make(map[string]*Zone, len(z))
for i := range z {
ZoneMap[z[i].Domain] = &z[i]
}
}
// Type w is an alias for []string to generate smaller source code
type w []string
// Constants to generate smaller source code
const (
t = true
f = false
e = ""
)
// Nil variables to generate smaller source code
var (
n []string // == nil
x []Zone // nil (no subdomains)
r *Zone // nil (root zone for TLDs)
)
// Tags are stored in a single integer as a bit field.
type Tags {{.TagType}}
// Tag values corresponding to bit shifts (1 << iota)
const (
{{range $i, $t := .Tags}} \
Tag{{identifier $t}} = {{index $.TagValues $t}}
{{end}} \
numTags = {{len .Tags}}
)
// TagStrings maps integer tag values to strings.
var TagStrings = map[Tags]string{
{{range $t := .Tags}} \
Tag{{identifier $t}}: "{{$t}}",
{{end }}
}
// TagValues maps tag names to integer values.
var TagValues = map[string]Tags{
{{range $t := .Tags}} \
"{{$t}}": Tag{{identifier $t}},
{{end }}
}
// ZoneMap maps domain names to Zones.
var ZoneMap map[string]*Zone
// Zones is a slice of all Zones in the database.
var Zones = z[:]
// TLDs is a slice of all top-level domain Zones.
var TLDs = z[:{{len .TLDs}}]
// z is a static array of Zones.
// Other global variables have pointers into this array.
var z [{{len .Zones}}]Zone
// y and z are separated to fix circular references.
var y = [{{len .Zones}}]Zone{
{{range $d := .Domains}} \
{{$z := (index $.Zones $d)}} \
{ \
{{quotedDomain $d}}, \
{{if $z.IsIDN}}/* {{$d}} */{{end }} \
{{if $z.ParentDomain}} &z[{{$z.ParentOffset}}] {{else}} r {{end}}, \
{{if $z.SubdomainsEnd}} z[{{$z.SubdomainsOffset}}:{{$z.SubdomainsEnd}}] {{else}} x {{end}}, \
{{if $z.TagBits}} {{printf "0x%x" $z.TagBits}} {{else}} 0 {{end}}, \
{{quoted $z.RegistryOperator}}, \
{{quotedURL $z.InfoURL}}, \
{{if $z.NameServers}} w{ {{range $z.NameServers}}{{quotedDomain .}},{{end}}} {{else}} n {{end}}, \
{{if $z.Wildcards}} w{ {{range $z.Wildcards}}{{quotedDomain .}},{{end}}} {{else}} n {{end}}, \
{{if $z.Locations}} w{ {{range $z.Locations}}{{quoted .}},{{end}}} {{else}} n {{end}}, \
{{if $z.Languages}} w{ {{range $z.Languages}}{{quoted .}},{{end}}} {{else}} n {{end}}, \
{{quotedDomain $z.WhoisServer}}, \
{{quotedURL $z.WhoisURL}}, \
{{if $z.RDAPURLs}} w{ {{range $z.RDAPURLs}}{{quotedDomain .}},{{end}}} {{else}} n {{end}}, \
{{if $z.IDNDisallowed}} f {{else}} t {{end}}, \
},
{{end}} \
}
`