mirror of
https://github.com/octoleo/restic.git
synced 2024-11-18 19:15:14 +00:00
710 lines
12 KiB
Go
710 lines
12 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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//go:generate go run gen.go
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//go:generate go run gen.go -test
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"go/format"
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"io/ioutil"
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"math/rand"
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"os"
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"sort"
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"strings"
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)
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// identifier converts s to a Go exported identifier.
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// It converts "div" to "Div" and "accept-charset" to "AcceptCharset".
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func identifier(s string) string {
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b := make([]byte, 0, len(s))
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cap := true
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for _, c := range s {
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if c == '-' {
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cap = true
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continue
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}
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if cap && 'a' <= c && c <= 'z' {
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c -= 'a' - 'A'
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}
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cap = false
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b = append(b, byte(c))
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}
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return string(b)
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}
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var test = flag.Bool("test", false, "generate table_test.go")
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func genFile(name string, buf *bytes.Buffer) {
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b, err := format.Source(buf.Bytes())
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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if err := ioutil.WriteFile(name, b, 0644); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func main() {
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flag.Parse()
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var all []string
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all = append(all, elements...)
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all = append(all, attributes...)
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all = append(all, eventHandlers...)
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all = append(all, extra...)
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sort.Strings(all)
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// uniq - lists have dups
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w := 0
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for _, s := range all {
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if w == 0 || all[w-1] != s {
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all[w] = s
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w++
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}
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}
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all = all[:w]
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if *test {
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var buf bytes.Buffer
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fmt.Fprintln(&buf, "// Code generated by go generate gen.go; DO NOT EDIT.\n")
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fmt.Fprintln(&buf, "//go:generate go run gen.go -test\n")
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fmt.Fprintln(&buf, "package atom\n")
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fmt.Fprintln(&buf, "var testAtomList = []string{")
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for _, s := range all {
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fmt.Fprintf(&buf, "\t%q,\n", s)
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}
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fmt.Fprintln(&buf, "}")
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genFile("table_test.go", &buf)
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return
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}
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// Find hash that minimizes table size.
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var best *table
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for i := 0; i < 1000000; i++ {
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if best != nil && 1<<(best.k-1) < len(all) {
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break
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}
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h := rand.Uint32()
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for k := uint(0); k <= 16; k++ {
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if best != nil && k >= best.k {
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break
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}
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var t table
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if t.init(h, k, all) {
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best = &t
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break
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}
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}
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}
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if best == nil {
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fmt.Fprintf(os.Stderr, "failed to construct string table\n")
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os.Exit(1)
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}
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// Lay out strings, using overlaps when possible.
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layout := append([]string{}, all...)
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// Remove strings that are substrings of other strings
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for changed := true; changed; {
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changed = false
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for i, s := range layout {
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if s == "" {
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continue
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}
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for j, t := range layout {
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if i != j && t != "" && strings.Contains(s, t) {
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changed = true
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layout[j] = ""
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}
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}
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}
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}
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// Join strings where one suffix matches another prefix.
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for {
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// Find best i, j, k such that layout[i][len-k:] == layout[j][:k],
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// maximizing overlap length k.
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besti := -1
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bestj := -1
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bestk := 0
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for i, s := range layout {
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if s == "" {
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continue
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}
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for j, t := range layout {
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if i == j {
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continue
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}
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for k := bestk + 1; k <= len(s) && k <= len(t); k++ {
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if s[len(s)-k:] == t[:k] {
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besti = i
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bestj = j
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bestk = k
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}
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}
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}
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}
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if bestk > 0 {
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layout[besti] += layout[bestj][bestk:]
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layout[bestj] = ""
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continue
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}
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break
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}
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text := strings.Join(layout, "")
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atom := map[string]uint32{}
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for _, s := range all {
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off := strings.Index(text, s)
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if off < 0 {
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panic("lost string " + s)
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}
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atom[s] = uint32(off<<8 | len(s))
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}
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var buf bytes.Buffer
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// Generate the Go code.
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fmt.Fprintln(&buf, "// Code generated by go generate gen.go; DO NOT EDIT.\n")
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fmt.Fprintln(&buf, "//go:generate go run gen.go\n")
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fmt.Fprintln(&buf, "package atom\n\nconst (")
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// compute max len
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maxLen := 0
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for _, s := range all {
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if maxLen < len(s) {
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maxLen = len(s)
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}
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fmt.Fprintf(&buf, "\t%s Atom = %#x\n", identifier(s), atom[s])
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}
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fmt.Fprintln(&buf, ")\n")
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fmt.Fprintf(&buf, "const hash0 = %#x\n\n", best.h0)
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fmt.Fprintf(&buf, "const maxAtomLen = %d\n\n", maxLen)
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fmt.Fprintf(&buf, "var table = [1<<%d]Atom{\n", best.k)
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for i, s := range best.tab {
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if s == "" {
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continue
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}
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fmt.Fprintf(&buf, "\t%#x: %#x, // %s\n", i, atom[s], s)
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}
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fmt.Fprintf(&buf, "}\n")
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datasize := (1 << best.k) * 4
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fmt.Fprintln(&buf, "const atomText =")
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textsize := len(text)
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for len(text) > 60 {
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fmt.Fprintf(&buf, "\t%q +\n", text[:60])
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text = text[60:]
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}
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fmt.Fprintf(&buf, "\t%q\n\n", text)
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genFile("table.go", &buf)
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fmt.Fprintf(os.Stdout, "%d atoms; %d string bytes + %d tables = %d total data\n", len(all), textsize, datasize, textsize+datasize)
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}
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type byLen []string
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func (x byLen) Less(i, j int) bool { return len(x[i]) > len(x[j]) }
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func (x byLen) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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func (x byLen) Len() int { return len(x) }
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// fnv computes the FNV hash with an arbitrary starting value h.
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func fnv(h uint32, s string) uint32 {
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for i := 0; i < len(s); i++ {
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h ^= uint32(s[i])
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h *= 16777619
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}
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return h
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}
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// A table represents an attempt at constructing the lookup table.
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// The lookup table uses cuckoo hashing, meaning that each string
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// can be found in one of two positions.
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type table struct {
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h0 uint32
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k uint
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mask uint32
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tab []string
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}
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// hash returns the two hashes for s.
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func (t *table) hash(s string) (h1, h2 uint32) {
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h := fnv(t.h0, s)
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h1 = h & t.mask
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h2 = (h >> 16) & t.mask
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return
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}
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// init initializes the table with the given parameters.
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// h0 is the initial hash value,
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// k is the number of bits of hash value to use, and
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// x is the list of strings to store in the table.
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// init returns false if the table cannot be constructed.
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func (t *table) init(h0 uint32, k uint, x []string) bool {
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t.h0 = h0
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t.k = k
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t.tab = make([]string, 1<<k)
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t.mask = 1<<k - 1
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for _, s := range x {
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if !t.insert(s) {
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return false
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}
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}
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return true
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}
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// insert inserts s in the table.
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func (t *table) insert(s string) bool {
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h1, h2 := t.hash(s)
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if t.tab[h1] == "" {
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t.tab[h1] = s
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return true
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}
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if t.tab[h2] == "" {
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t.tab[h2] = s
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return true
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}
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if t.push(h1, 0) {
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t.tab[h1] = s
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return true
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}
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if t.push(h2, 0) {
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t.tab[h2] = s
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return true
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}
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return false
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}
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// push attempts to push aside the entry in slot i.
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func (t *table) push(i uint32, depth int) bool {
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if depth > len(t.tab) {
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return false
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}
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s := t.tab[i]
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h1, h2 := t.hash(s)
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j := h1 + h2 - i
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if t.tab[j] != "" && !t.push(j, depth+1) {
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return false
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}
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t.tab[j] = s
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return true
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}
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// The lists of element names and attribute keys were taken from
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// https://html.spec.whatwg.org/multipage/indices.html#index
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// as of the "HTML Living Standard - Last Updated 18 September 2017" version.
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// "command", "keygen" and "menuitem" have been removed from the spec,
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// but are kept here for backwards compatibility.
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var elements = []string{
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"a",
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"abbr",
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"address",
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"area",
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"article",
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"aside",
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"audio",
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"b",
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"base",
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"bdi",
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"bdo",
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"blockquote",
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"body",
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"br",
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"button",
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"canvas",
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"caption",
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"cite",
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"code",
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"col",
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"colgroup",
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"command",
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"data",
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"datalist",
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"dd",
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"del",
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"details",
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"dfn",
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"dialog",
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"div",
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"dl",
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"dt",
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"em",
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"embed",
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"fieldset",
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"figcaption",
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"figure",
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"footer",
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"form",
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"h1",
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"h2",
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"h3",
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"h4",
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"h5",
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"h6",
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"head",
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"header",
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"hgroup",
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"hr",
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"html",
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"i",
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"iframe",
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"img",
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"input",
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"ins",
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"kbd",
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"keygen",
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"label",
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"legend",
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"li",
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"link",
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"main",
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"map",
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"mark",
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"menu",
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"menuitem",
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"meta",
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"meter",
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"nav",
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"noscript",
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"object",
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"ol",
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"optgroup",
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"option",
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"output",
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"p",
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"param",
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"picture",
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"pre",
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"progress",
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"q",
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"rp",
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"rt",
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"ruby",
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"s",
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"samp",
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"script",
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"section",
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"select",
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"slot",
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"small",
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"source",
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"span",
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"strong",
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"style",
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"sub",
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"summary",
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"sup",
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"table",
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"tbody",
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"td",
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"template",
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"textarea",
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"tfoot",
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"th",
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"thead",
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"time",
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"title",
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"tr",
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"track",
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"u",
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"ul",
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"var",
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"video",
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"wbr",
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}
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// https://html.spec.whatwg.org/multipage/indices.html#attributes-3
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//
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// "challenge", "command", "contextmenu", "dropzone", "icon", "keytype", "mediagroup",
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// "radiogroup", "spellcheck", "scoped", "seamless", "sortable" and "sorted" have been removed from the spec,
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// but are kept here for backwards compatibility.
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var attributes = []string{
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"abbr",
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"accept",
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"accept-charset",
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"accesskey",
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"action",
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"allowfullscreen",
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"allowpaymentrequest",
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"allowusermedia",
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"alt",
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"as",
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"async",
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"autocomplete",
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"autofocus",
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"autoplay",
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"challenge",
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"charset",
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"checked",
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"cite",
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"class",
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"color",
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"cols",
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"colspan",
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"command",
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"content",
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"contenteditable",
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"contextmenu",
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"controls",
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"coords",
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"crossorigin",
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"data",
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"datetime",
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"default",
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"defer",
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"dir",
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"dirname",
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"disabled",
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"download",
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"draggable",
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"dropzone",
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"enctype",
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"for",
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"form",
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"formaction",
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"formenctype",
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"formmethod",
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"formnovalidate",
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"formtarget",
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"headers",
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"height",
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"hidden",
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"high",
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"href",
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"hreflang",
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"http-equiv",
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"icon",
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"id",
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"inputmode",
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"integrity",
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"is",
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"ismap",
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"itemid",
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"itemprop",
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"itemref",
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"itemscope",
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"itemtype",
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"keytype",
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"kind",
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"label",
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"lang",
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"list",
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"loop",
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"low",
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"manifest",
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"max",
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"maxlength",
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"media",
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"mediagroup",
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"method",
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"min",
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"minlength",
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"multiple",
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"muted",
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"name",
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"nomodule",
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"nonce",
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"novalidate",
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"open",
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"optimum",
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"pattern",
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"ping",
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"placeholder",
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"playsinline",
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"poster",
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"preload",
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"radiogroup",
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"readonly",
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"referrerpolicy",
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"rel",
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"required",
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"reversed",
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"rows",
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"rowspan",
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"sandbox",
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"spellcheck",
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"scope",
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"scoped",
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"seamless",
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"selected",
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"shape",
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"size",
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"sizes",
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"sortable",
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"sorted",
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"slot",
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"span",
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"spellcheck",
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"src",
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"srcdoc",
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"srclang",
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"srcset",
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"start",
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"step",
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"style",
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"tabindex",
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"target",
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"title",
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"translate",
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"type",
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"typemustmatch",
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"updateviacache",
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"usemap",
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"value",
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"width",
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"workertype",
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"wrap",
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}
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|
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// "onautocomplete", "onautocompleteerror", "onmousewheel",
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// "onshow" and "onsort" have been removed from the spec,
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// but are kept here for backwards compatibility.
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var eventHandlers = []string{
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"onabort",
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"onautocomplete",
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"onautocompleteerror",
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"onauxclick",
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"onafterprint",
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"onbeforeprint",
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"onbeforeunload",
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"onblur",
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"oncancel",
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"oncanplay",
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"oncanplaythrough",
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"onchange",
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"onclick",
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"onclose",
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"oncontextmenu",
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"oncopy",
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"oncuechange",
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"oncut",
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"ondblclick",
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"ondrag",
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"ondragend",
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"ondragenter",
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"ondragexit",
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"ondragleave",
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"ondragover",
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"ondragstart",
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"ondrop",
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"ondurationchange",
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"onemptied",
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"onended",
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|
"onerror",
|
|
"onfocus",
|
|
"onhashchange",
|
|
"oninput",
|
|
"oninvalid",
|
|
"onkeydown",
|
|
"onkeypress",
|
|
"onkeyup",
|
|
"onlanguagechange",
|
|
"onload",
|
|
"onloadeddata",
|
|
"onloadedmetadata",
|
|
"onloadend",
|
|
"onloadstart",
|
|
"onmessage",
|
|
"onmessageerror",
|
|
"onmousedown",
|
|
"onmouseenter",
|
|
"onmouseleave",
|
|
"onmousemove",
|
|
"onmouseout",
|
|
"onmouseover",
|
|
"onmouseup",
|
|
"onmousewheel",
|
|
"onwheel",
|
|
"onoffline",
|
|
"ononline",
|
|
"onpagehide",
|
|
"onpageshow",
|
|
"onpaste",
|
|
"onpause",
|
|
"onplay",
|
|
"onplaying",
|
|
"onpopstate",
|
|
"onprogress",
|
|
"onratechange",
|
|
"onreset",
|
|
"onresize",
|
|
"onrejectionhandled",
|
|
"onscroll",
|
|
"onsecuritypolicyviolation",
|
|
"onseeked",
|
|
"onseeking",
|
|
"onselect",
|
|
"onshow",
|
|
"onsort",
|
|
"onstalled",
|
|
"onstorage",
|
|
"onsubmit",
|
|
"onsuspend",
|
|
"ontimeupdate",
|
|
"ontoggle",
|
|
"onunhandledrejection",
|
|
"onunload",
|
|
"onvolumechange",
|
|
"onwaiting",
|
|
}
|
|
|
|
// extra are ad-hoc values not covered by any of the lists above.
|
|
var extra = []string{
|
|
"align",
|
|
"annotation",
|
|
"annotation-xml",
|
|
"applet",
|
|
"basefont",
|
|
"bgsound",
|
|
"big",
|
|
"blink",
|
|
"center",
|
|
"color",
|
|
"desc",
|
|
"face",
|
|
"font",
|
|
"foreignObject", // HTML is case-insensitive, but SVG-embedded-in-HTML is case-sensitive.
|
|
"foreignobject",
|
|
"frame",
|
|
"frameset",
|
|
"image",
|
|
"isindex",
|
|
"listing",
|
|
"malignmark",
|
|
"marquee",
|
|
"math",
|
|
"mglyph",
|
|
"mi",
|
|
"mn",
|
|
"mo",
|
|
"ms",
|
|
"mtext",
|
|
"nobr",
|
|
"noembed",
|
|
"noframes",
|
|
"plaintext",
|
|
"prompt",
|
|
"public",
|
|
"spacer",
|
|
"strike",
|
|
"svg",
|
|
"system",
|
|
"tt",
|
|
"xmp",
|
|
}
|