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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// +build ignore
// Gen generates sais2.go by duplicating functions in sais.go
// using different input types.
// See the comment at the top of sais.go for details.
package main
import (
"bytes"
"log"
"os"
"strings"
)
func main() {
log.SetPrefix("gen: ")
log.SetFlags(0)
data, err := os.ReadFile("sais.go")
if err != nil {
log.Fatal(err)
}
x := bytes.Index(data, []byte("\n\n"))
if x < 0 {
log.Fatal("cannot find blank line after copyright comment")
}
var buf bytes.Buffer
buf.Write(data[:x])
buf.WriteString("\n\n// Code generated by go generate; DO NOT EDIT.\n\npackage suffixarray\n")
for {
x := bytes.Index(data, []byte("\nfunc "))
if x < 0 {
break
}
data = data[x:]
p := bytes.IndexByte(data, '(')
if p < 0 {
p = len(data)
}
name := string(data[len("\nfunc "):p])
x = bytes.Index(data, []byte("\n}\n"))
if x < 0 {
log.Fatalf("cannot find end of func %s", name)
}
fn := string(data[:x+len("\n}\n")])
data = data[x+len("\n}"):]
if strings.HasSuffix(name, "_32") {
buf.WriteString(fix32.Replace(fn))
}
if strings.HasSuffix(name, "_8_32") {
// x_8_32 -> x_8_64 done above
fn = fix8_32.Replace(stripByteOnly(fn))
buf.WriteString(fn)
buf.WriteString(fix32.Replace(fn))
}
}
if err := os.WriteFile("sais2.go", buf.Bytes(), 0666); err != nil {
log.Fatal(err)
}
}
var fix32 = strings.NewReplacer(
"32", "64",
"int32", "int64",
)
var fix8_32 = strings.NewReplacer(
"_8_32", "_32",
"byte", "int32",
)
func stripByteOnly(s string) string {
lines := strings.SplitAfter(s, "\n")
w := 0
for _, line := range lines {
if !strings.Contains(line, "256") && !strings.Contains(line, "byte-only") {
lines[w] = line
w++
}
}
return strings.Join(lines[:w], "")
}
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