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translate.go
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translate.go
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// This work is subject to the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// license. Its contents can be found at:
// http://creativecommons.org/publicdomain/zero/1.0/
package bindata
import (
"compress/gzip"
"fmt"
"io"
"regexp"
"strings"
"unicode"
)
var regFuncName = regexp.MustCompile(`[^a-zA-Z0-9_]`)
// translate translates the input file to go source code.
func Translate(input io.Reader, output io.Writer, pkgname, funcname string, uncompressed, nomemcpy bool) {
if nomemcpy {
if uncompressed {
translate_nomemcpy_uncomp(input, output, pkgname, funcname)
} else {
translate_nomemcpy_comp(input, output, pkgname, funcname)
}
} else {
if uncompressed {
translate_memcpy_uncomp(input, output, pkgname, funcname)
} else {
translate_memcpy_comp(input, output, pkgname, funcname)
}
}
}
// input -> gzip -> gowriter -> output.
func translate_memcpy_comp(input io.Reader, output io.Writer, pkgname, funcname string) {
fmt.Fprintf(output, `package %s
import (
"bytes"
"compress/gzip"
"io"
)
// %s returns raw, uncompressed file data.
func %s() []byte {
gz, err := gzip.NewReader(bytes.NewBuffer([]byte{`, pkgname, funcname, funcname)
gz := gzip.NewWriter(&ByteWriter{Writer: output})
io.Copy(gz, input)
gz.Close()
fmt.Fprint(output, `
}))
if err != nil {
panic("Decompression failed: " + err.Error())
}
var b bytes.Buffer
io.Copy(&b, gz)
gz.Close()
return b.Bytes()
}`)
}
// input -> gzip -> gowriter -> output.
func translate_memcpy_uncomp(input io.Reader, output io.Writer, pkgname, funcname string) {
fmt.Fprintf(output, `package %s
// %s returns raw file data.
func %s() []byte {
return []byte{`, pkgname, funcname, funcname)
io.Copy(&ByteWriter{Writer: output}, input)
fmt.Fprint(output, `
}
}`)
}
// input -> gzip -> gowriter -> output.
func translate_nomemcpy_comp(input io.Reader, output io.Writer, pkgname, funcname string) {
fmt.Fprintf(output, `package %s
import (
"bytes"
"compress/gzip"
"io"
"reflect"
"unsafe"
)
var _%s = "`, pkgname, funcname)
gz := gzip.NewWriter(&StringWriter{Writer: output})
io.Copy(gz, input)
gz.Close()
fmt.Fprintf(output, `"
// %s returns raw, uncompressed file data.
func %s() []byte {
var empty [0]byte
sx := (*reflect.StringHeader)(unsafe.Pointer(&_%s))
b := empty[:]
bx := (*reflect.SliceHeader)(unsafe.Pointer(&b))
bx.Data = sx.Data
bx.Len = len(_%s)
bx.Cap = bx.Len
gz, err := gzip.NewReader(bytes.NewBuffer(b))
if err != nil {
panic("Decompression failed: " + err.Error())
}
var buf bytes.Buffer
io.Copy(&buf, gz)
gz.Close()
return buf.Bytes()
}
`, funcname, funcname, funcname, funcname)
}
// input -> gowriter -> output.
func translate_nomemcpy_uncomp(input io.Reader, output io.Writer, pkgname, funcname string) {
fmt.Fprintf(output, `package %s
import (
"reflect"
"unsafe"
)
var _%s = "`, pkgname, funcname)
io.Copy(&StringWriter{Writer: output}, input)
fmt.Fprintf(output, `"
// %s returns raw file data.
//
// WARNING: The returned byte slice is READ-ONLY.
// Attempting to alter the slice contents will yield a runtime panic.
func %s() []byte {
var empty [0]byte
sx := (*reflect.StringHeader)(unsafe.Pointer(&_%s))
b := empty[:]
bx := (*reflect.SliceHeader)(unsafe.Pointer(&b))
bx.Data = sx.Data
bx.Len = len(_%s)
bx.Cap = bx.Len
return b
}
`, funcname, funcname, funcname, funcname)
}
// safeFuncname creates a safe function name from the input path.
func SafeFuncname(in, prefix string) string {
name := strings.Replace(in, prefix, "", 1)
if len(name) == 0 {
name = in
}
name = strings.ToLower(name)
name = regFuncName.ReplaceAllString(name, "_")
if unicode.IsDigit(rune(name[0])) {
// Identifier can't start with a digit.
name = "_" + name
}
// Get rid of "__" instances for niceness.
for strings.Index(name, "__") > -1 {
name = strings.Replace(name, "__", "_", -1)
}
// Leading underscore is silly.
if name[0] == '_' {
name = name[1:]
}
return name
}