1160 lines
27 KiB
Go
1160 lines
27 KiB
Go
/*
|
||
Translate file names for usage on restrictive storage systems
|
||
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||
The restricted set of characters are mapped to a unicode equivalent version
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(most to their FULLWIDTH variant) to increase compatability with other
|
||
storage systems.
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See: http://unicode-search.net/unicode-namesearch.pl?term=FULLWIDTH
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||
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||
Encoders will also quote reserved characters to differentiate between
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the raw and encoded forms.
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*/
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||
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package encoder
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||
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||
import (
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||
"bytes"
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||
"fmt"
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||
"io"
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||
"sort"
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||
"strconv"
|
||
"strings"
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||
"unicode/utf8"
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||
)
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||
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||
const (
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||
// adding this to any printable ASCII character turns it into the
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||
// FULLWIDTH variant
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||
fullOffset = 0xFEE0
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||
// the first rune of the SYMBOL FOR block for control characters
|
||
symbolOffset = '␀' // SYMBOL FOR NULL
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||
// QuoteRune is the rune used for quoting reserved characters
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QuoteRune = '‛' // SINGLE HIGH-REVERSED-9 QUOTATION MARK
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||
)
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||
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||
// NB keep the tests in fstests/fstests/fstests.go FsEncoding up to date with this
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||
// NB keep the aliases up to date below also
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||
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||
// Possible flags for the MultiEncoder
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||
const (
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||
EncodeZero MultiEncoder = 0 // NUL(0x00)
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EncodeSlash MultiEncoder = 1 << iota // /
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EncodeLtGt // <>
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EncodeDoubleQuote // "
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||
EncodeSingleQuote // '
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||
EncodeBackQuote // `
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||
EncodeDollar // $
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||
EncodeColon // :
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||
EncodeQuestion // ?
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||
EncodeAsterisk // *
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||
EncodePipe // |
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||
EncodeHash // #
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||
EncodePercent // %
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||
EncodeBackSlash // \
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||
EncodeCrLf // CR(0x0D), LF(0x0A)
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||
EncodeDel // DEL(0x7F)
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||
EncodeCtl // CTRL(0x01-0x1F)
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||
EncodeLeftSpace // Leading SPACE
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||
EncodeLeftPeriod // Leading .
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EncodeLeftTilde // Leading ~
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||
EncodeLeftCrLfHtVt // Leading CR LF HT VT
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||
EncodeRightSpace // Trailing SPACE
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||
EncodeRightPeriod // Trailing .
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||
EncodeRightCrLfHtVt // Trailing CR LF HT VT
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||
EncodeInvalidUtf8 // Invalid UTF-8 bytes
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||
EncodeDot // . and .. names
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||
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||
// Synthetic
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||
EncodeWin = EncodeColon | EncodeQuestion | EncodeDoubleQuote | EncodeAsterisk | EncodeLtGt | EncodePipe // :?"*<>|
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||
EncodeHashPercent = EncodeHash | EncodePercent // #%
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||
)
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||
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||
// Has returns true if flag is contained in mask
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func (mask MultiEncoder) Has(flag MultiEncoder) bool {
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||
return mask&flag != 0
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||
}
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// Encoder can transform names to and from the original and translated version.
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type Encoder interface {
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// Encode takes a raw name and substitutes any reserved characters and
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// patterns in it
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Encode(string) string
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||
// Decode takes a name and undoes any substitutions made by Encode
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||
Decode(string) string
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// FromStandardPath takes a / separated path in Standard encoding
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||
// and converts it to a / separated path in this encoding.
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||
FromStandardPath(string) string
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||
// FromStandardName takes name in Standard encoding and converts
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||
// it in this encoding.
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||
FromStandardName(string) string
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||
// ToStandardPath takes a / separated path in this encoding
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||
// and converts it to a / separated path in Standard encoding.
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||
ToStandardPath(string) string
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||
// ToStandardName takes name in this encoding and converts
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||
// it in Standard encoding.
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||
ToStandardName(string) string
|
||
}
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||
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||
// MultiEncoder is a configurable Encoder. The Encode* constants in this
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||
// package can be combined using bitwise or (|) to enable handling of multiple
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||
// character classes
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type MultiEncoder uint
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||
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||
// Aliases maps encodings to names and vice versa
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||
var (
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||
encodingToName = map[MultiEncoder]string{}
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||
nameToEncoding = map[string]MultiEncoder{}
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||
)
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||
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||
// alias adds an alias for MultiEncoder.String() and MultiEncoder.Set()
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||
func alias(name string, mask MultiEncoder) {
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||
nameToEncoding[name] = mask
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||
// don't overwrite existing reverse translations
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||
if _, ok := encodingToName[mask]; !ok {
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||
encodingToName[mask] = name
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||
}
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||
}
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||
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||
func init() {
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||
alias("None", EncodeZero)
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||
alias("Slash", EncodeSlash)
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||
alias("LtGt", EncodeLtGt)
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||
alias("DoubleQuote", EncodeDoubleQuote)
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alias("SingleQuote", EncodeSingleQuote)
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||
alias("BackQuote", EncodeBackQuote)
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||
alias("Dollar", EncodeDollar)
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||
alias("Colon", EncodeColon)
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||
alias("Question", EncodeQuestion)
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||
alias("Asterisk", EncodeAsterisk)
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||
alias("Pipe", EncodePipe)
|
||
alias("Hash", EncodeHash)
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||
alias("Percent", EncodePercent)
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||
alias("BackSlash", EncodeBackSlash)
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||
alias("CrLf", EncodeCrLf)
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||
alias("Del", EncodeDel)
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||
alias("Ctl", EncodeCtl)
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||
alias("LeftSpace", EncodeLeftSpace)
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||
alias("LeftPeriod", EncodeLeftPeriod)
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||
alias("LeftTilde", EncodeLeftTilde)
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||
alias("LeftCrLfHtVt", EncodeLeftCrLfHtVt)
|
||
alias("RightSpace", EncodeRightSpace)
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||
alias("RightPeriod", EncodeRightPeriod)
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||
alias("RightCrLfHtVt", EncodeRightCrLfHtVt)
|
||
alias("InvalidUtf8", EncodeInvalidUtf8)
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||
alias("Dot", EncodeDot)
|
||
}
|
||
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||
// validStrings returns all the valid MultiEncoder strings
|
||
func validStrings() string {
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||
var out []string
|
||
for k := range nameToEncoding {
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||
out = append(out, k)
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||
}
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||
sort.Strings(out)
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||
return strings.Join(out, ", ")
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||
}
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||
|
||
// String converts the MultiEncoder into text
|
||
func (mask MultiEncoder) String() string {
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||
// See if there is an exact translation - if so return that
|
||
if name, ok := encodingToName[mask]; ok {
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||
return name
|
||
}
|
||
var out []string
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||
// Otherwise decompose bit by bit
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||
for bit := MultiEncoder(1); bit != 0; bit *= 2 {
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||
if (mask & bit) != 0 {
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||
if name, ok := encodingToName[bit]; ok {
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||
out = append(out, name)
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||
} else {
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||
out = append(out, fmt.Sprintf("0x%X", uint(bit)))
|
||
}
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||
}
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||
}
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||
return strings.Join(out, ",")
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||
}
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||
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||
// Set converts a string into a MultiEncoder
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||
func (mask *MultiEncoder) Set(in string) error {
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||
var out MultiEncoder
|
||
parts := strings.Split(in, ",")
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||
for _, part := range parts {
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||
part = strings.TrimSpace(part)
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||
if bits, ok := nameToEncoding[part]; ok {
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||
out |= bits
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||
} else {
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||
i, err := strconv.ParseInt(part, 0, 64)
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||
if err != nil {
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||
return fmt.Errorf("bad encoding %q: possible values are: %s", part, validStrings())
|
||
}
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||
out |= MultiEncoder(i)
|
||
}
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||
}
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||
*mask = out
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||
return nil
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||
}
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||
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||
// Type returns a textual type of the MultiEncoder to satsify the pflag.Value interface
|
||
func (mask MultiEncoder) Type() string {
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||
return "Encoding"
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||
}
|
||
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||
// Scan implements the fmt.Scanner interface
|
||
func (mask *MultiEncoder) Scan(s fmt.ScanState, ch rune) error {
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||
token, err := s.Token(true, nil)
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||
if err != nil {
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||
return err
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||
}
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||
return mask.Set(string(token))
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||
}
|
||
|
||
// Encode takes a raw name and substitutes any reserved characters and
|
||
// patterns in it
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||
func (mask MultiEncoder) Encode(in string) string {
|
||
if in == "" {
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||
return ""
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||
}
|
||
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||
if mask.Has(EncodeDot) {
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||
switch in {
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||
case ".":
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||
return "．"
|
||
case "..":
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||
return "．．"
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||
case "．":
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||
return string(QuoteRune) + "．"
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||
case "．．":
|
||
return string(QuoteRune) + "．" + string(QuoteRune) + "．"
|
||
}
|
||
}
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||
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||
// handle prefix only replacements
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||
prefix := ""
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||
if mask.Has(EncodeLeftSpace) { // Leading SPACE
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||
if in[0] == ' ' {
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||
prefix, in = "␠", in[1:] // SYMBOL FOR SPACE
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||
} else if r, l := utf8.DecodeRuneInString(in); r == '␠' { // SYMBOL FOR SPACE
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||
prefix, in = string(QuoteRune)+"␠", in[l:] // SYMBOL FOR SPACE
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||
}
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||
}
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||
if mask.Has(EncodeLeftPeriod) && prefix == "" { // Leading PERIOD
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||
if in[0] == '.' {
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||
prefix, in = "．", in[1:] // FULLWIDTH FULL STOP
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||
} else if r, l := utf8.DecodeRuneInString(in); r == '．' { // FULLWIDTH FULL STOP
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||
prefix, in = string(QuoteRune)+"．", in[l:] // FULLWIDTH FULL STOP
|
||
}
|
||
}
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||
if mask.Has(EncodeLeftTilde) && prefix == "" { // Leading ~
|
||
if in[0] == '~' {
|
||
prefix, in = string('~'+fullOffset), in[1:] // FULLWIDTH TILDE
|
||
} else if r, l := utf8.DecodeRuneInString(in); r == '~'+fullOffset {
|
||
prefix, in = string(QuoteRune)+string('~'+fullOffset), in[l:] // FULLWIDTH TILDE
|
||
}
|
||
}
|
||
if mask.Has(EncodeLeftCrLfHtVt) && prefix == "" { // Leading CR LF HT VT
|
||
switch c := in[0]; c {
|
||
case '\t', '\n', '\v', '\r':
|
||
prefix, in = string('␀'+rune(c)), in[1:] // SYMBOL FOR NULL
|
||
default:
|
||
switch r, l := utf8.DecodeRuneInString(in); r {
|
||
case '␀' + '\t', '␀' + '\n', '␀' + '\v', '␀' + '\r':
|
||
prefix, in = string(QuoteRune)+string(r), in[l:]
|
||
}
|
||
}
|
||
}
|
||
// handle suffix only replacements
|
||
suffix := ""
|
||
if in != "" {
|
||
if mask.Has(EncodeRightSpace) { // Trailing SPACE
|
||
if in[len(in)-1] == ' ' {
|
||
suffix, in = "␠", in[:len(in)-1] // SYMBOL FOR SPACE
|
||
} else if r, l := utf8.DecodeLastRuneInString(in); r == '␠' {
|
||
suffix, in = string(QuoteRune)+"␠", in[:len(in)-l] // SYMBOL FOR SPACE
|
||
}
|
||
}
|
||
if mask.Has(EncodeRightPeriod) && suffix == "" { // Trailing .
|
||
if in[len(in)-1] == '.' {
|
||
suffix, in = "．", in[:len(in)-1] // FULLWIDTH FULL STOP
|
||
} else if r, l := utf8.DecodeLastRuneInString(in); r == '．' {
|
||
suffix, in = string(QuoteRune)+"．", in[:len(in)-l] // FULLWIDTH FULL STOP
|
||
}
|
||
}
|
||
if mask.Has(EncodeRightCrLfHtVt) && suffix == "" { // Trailing .
|
||
switch c := in[len(in)-1]; c {
|
||
case '\t', '\n', '\v', '\r':
|
||
suffix, in = string('␀'+rune(c)), in[:len(in)-1] // FULLWIDTH FULL STOP
|
||
default:
|
||
switch r, l := utf8.DecodeLastRuneInString(in); r {
|
||
case '␀' + '\t', '␀' + '\n', '␀' + '\v', '␀' + '\r':
|
||
suffix, in = string(QuoteRune)+string(r), in[:len(in)-l]
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
index := 0
|
||
if prefix == "" && suffix == "" {
|
||
// find the first rune which (most likely) needs to be replaced
|
||
index = strings.IndexFunc(in, func(r rune) bool {
|
||
switch r {
|
||
case 0, '␀', QuoteRune, utf8.RuneError:
|
||
return true
|
||
}
|
||
if mask.Has(EncodeAsterisk) { // *
|
||
switch r {
|
||
case '*',
|
||
'＊':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeLtGt) { // <>
|
||
switch r {
|
||
case '<', '>',
|
||
'＜', '＞':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeQuestion) { // ?
|
||
switch r {
|
||
case '?',
|
||
'？':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeColon) { // :
|
||
switch r {
|
||
case ':',
|
||
'：':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodePipe) { // |
|
||
switch r {
|
||
case '|',
|
||
'｜':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeDoubleQuote) { // "
|
||
switch r {
|
||
case '"',
|
||
'＂':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeSingleQuote) { // '
|
||
switch r {
|
||
case '\'',
|
||
'＇':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackQuote) { // `
|
||
switch r {
|
||
case '`',
|
||
'｀':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeDollar) { // $
|
||
switch r {
|
||
case '$',
|
||
'＄':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeSlash) { // /
|
||
switch r {
|
||
case '/',
|
||
'／':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackSlash) { // \
|
||
switch r {
|
||
case '\\',
|
||
'＼':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeCrLf) { // CR LF
|
||
switch r {
|
||
case rune(0x0D), rune(0x0A),
|
||
'␍', '␊':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeHash) { // #
|
||
switch r {
|
||
case '#',
|
||
'＃':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodePercent) { // %
|
||
switch r {
|
||
case '%',
|
||
'％':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeDel) { // DEL(0x7F)
|
||
switch r {
|
||
case rune(0x7F), '␡':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeCtl) { // CTRL(0x01-0x1F)
|
||
if r >= 1 && r <= 0x1F {
|
||
return true
|
||
} else if r > symbolOffset && r <= symbolOffset+0x1F {
|
||
return true
|
||
}
|
||
}
|
||
return false
|
||
})
|
||
}
|
||
// nothing to replace, return input
|
||
if index == -1 {
|
||
return in
|
||
}
|
||
|
||
var out bytes.Buffer
|
||
out.Grow(len(in) + len(prefix) + len(suffix))
|
||
out.WriteString(prefix)
|
||
// copy the clean part of the input and skip it
|
||
out.WriteString(in[:index])
|
||
in = in[index:]
|
||
|
||
for i, r := range in {
|
||
switch r {
|
||
case 0:
|
||
out.WriteRune(symbolOffset)
|
||
continue
|
||
case '␀', QuoteRune:
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
case utf8.RuneError:
|
||
if mask.Has(EncodeInvalidUtf8) {
|
||
// only encode invalid sequences and not utf8.RuneError
|
||
if i+3 > len(in) || in[i:i+3] != string(utf8.RuneError) {
|
||
_, l := utf8.DecodeRuneInString(in[i:])
|
||
appendQuotedBytes(&out, in[i:i+l])
|
||
continue
|
||
}
|
||
} else {
|
||
// append the real bytes instead of utf8.RuneError
|
||
_, l := utf8.DecodeRuneInString(in[i:])
|
||
out.WriteString(in[i : i+l])
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeAsterisk) { // *
|
||
switch r {
|
||
case '*':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＊':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeLtGt) { // <>
|
||
switch r {
|
||
case '<', '>':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＜', '＞':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeQuestion) { // ?
|
||
switch r {
|
||
case '?':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '？':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeColon) { // :
|
||
switch r {
|
||
case ':':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '：':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodePipe) { // |
|
||
switch r {
|
||
case '|':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '｜':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeDoubleQuote) { // "
|
||
switch r {
|
||
case '"':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＂':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeSingleQuote) { // '
|
||
switch r {
|
||
case '\'':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＇':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackQuote) { // `
|
||
switch r {
|
||
case '`':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '｀':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeDollar) { // $
|
||
switch r {
|
||
case '$':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＄':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeSlash) { // /
|
||
switch r {
|
||
case '/':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '／':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackSlash) { // \
|
||
switch r {
|
||
case '\\':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＼':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeCrLf) { // CR LF
|
||
switch r {
|
||
case rune(0x0D), rune(0x0A):
|
||
out.WriteRune(r + symbolOffset)
|
||
continue
|
||
case '␍', '␊':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeHash) { // #
|
||
switch r {
|
||
case '#':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '＃':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodePercent) { // %
|
||
switch r {
|
||
case '%':
|
||
out.WriteRune(r + fullOffset)
|
||
continue
|
||
case '％':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeDel) { // DEL(0x7F)
|
||
switch r {
|
||
case rune(0x7F):
|
||
out.WriteRune('␡') // SYMBOL FOR DELETE
|
||
continue
|
||
case '␡':
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeCtl) { // CTRL(0x01-0x1F)
|
||
if r >= 1 && r <= 0x1F {
|
||
out.WriteRune('␀' + r) // SYMBOL FOR NULL
|
||
continue
|
||
} else if r > symbolOffset && r <= symbolOffset+0x1F {
|
||
out.WriteRune(QuoteRune)
|
||
out.WriteRune(r)
|
||
continue
|
||
}
|
||
}
|
||
out.WriteRune(r)
|
||
}
|
||
out.WriteString(suffix)
|
||
return out.String()
|
||
}
|
||
|
||
// Decode takes a name and undoes any substitutions made by Encode
|
||
func (mask MultiEncoder) Decode(in string) string {
|
||
if mask.Has(EncodeDot) {
|
||
switch in {
|
||
case "．":
|
||
return "."
|
||
case "．．":
|
||
return ".."
|
||
case string(QuoteRune) + "．":
|
||
return "．"
|
||
case string(QuoteRune) + "．" + string(QuoteRune) + "．":
|
||
return "．．"
|
||
}
|
||
}
|
||
|
||
// handle prefix only replacements
|
||
prefix := ""
|
||
if r, l1 := utf8.DecodeRuneInString(in); mask.Has(EncodeLeftSpace) && r == '␠' { // SYMBOL FOR SPACE
|
||
prefix, in = " ", in[l1:]
|
||
} else if mask.Has(EncodeLeftPeriod) && r == '．' { // FULLWIDTH FULL STOP
|
||
prefix, in = ".", in[l1:]
|
||
} else if mask.Has(EncodeLeftTilde) && r == '～' { // FULLWIDTH TILDE
|
||
prefix, in = "~", in[l1:]
|
||
} else if mask.Has(EncodeLeftCrLfHtVt) && (r == '␀'+'\t' || r == '␀'+'\n' || r == '␀'+'\v' || r == '␀'+'\r') {
|
||
prefix, in = string(r-'␀'), in[l1:]
|
||
} else if r == QuoteRune {
|
||
if r, l2 := utf8.DecodeRuneInString(in[l1:]); mask.Has(EncodeLeftSpace) && r == '␠' { // SYMBOL FOR SPACE
|
||
prefix, in = "␠", in[l1+l2:]
|
||
} else if mask.Has(EncodeLeftPeriod) && r == '．' { // FULLWIDTH FULL STOP
|
||
prefix, in = "．", in[l1+l2:]
|
||
} else if mask.Has(EncodeLeftTilde) && r == '～' { // FULLWIDTH TILDE
|
||
prefix, in = "～", in[l1+l2:]
|
||
} else if mask.Has(EncodeLeftCrLfHtVt) && (r == '␀'+'\t' || r == '␀'+'\n' || r == '␀'+'\v' || r == '␀'+'\r') {
|
||
prefix, in = string(r), in[l1+l2:]
|
||
}
|
||
}
|
||
|
||
// handle suffix only replacements
|
||
suffix := ""
|
||
if r, l := utf8.DecodeLastRuneInString(in); mask.Has(EncodeRightSpace) && r == '␠' { // SYMBOL FOR SPACE
|
||
in = in[:len(in)-l]
|
||
if q, l2 := utf8.DecodeLastRuneInString(in); q == QuoteRune {
|
||
suffix, in = "␠", in[:len(in)-l2]
|
||
} else {
|
||
suffix = " "
|
||
}
|
||
} else if mask.Has(EncodeRightPeriod) && r == '．' { // FULLWIDTH FULL STOP
|
||
in = in[:len(in)-l]
|
||
if q, l2 := utf8.DecodeLastRuneInString(in); q == QuoteRune {
|
||
suffix, in = "．", in[:len(in)-l2]
|
||
} else {
|
||
suffix = "."
|
||
}
|
||
} else if mask.Has(EncodeRightCrLfHtVt) && (r == '␀'+'\t' || r == '␀'+'\n' || r == '␀'+'\v' || r == '␀'+'\r') {
|
||
in = in[:len(in)-l]
|
||
if q, l2 := utf8.DecodeLastRuneInString(in); q == QuoteRune {
|
||
suffix, in = string(r), in[:len(in)-l2]
|
||
} else {
|
||
suffix = string(r - '␀')
|
||
}
|
||
}
|
||
index := 0
|
||
if prefix == "" && suffix == "" {
|
||
// find the first rune which (most likely) needs to be replaced
|
||
index = strings.IndexFunc(in, func(r rune) bool {
|
||
switch r {
|
||
case '␀', QuoteRune:
|
||
return true
|
||
}
|
||
if mask.Has(EncodeAsterisk) { // *
|
||
switch r {
|
||
case '＊':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeLtGt) { // <>
|
||
switch r {
|
||
case '＜', '＞':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeQuestion) { // ?
|
||
switch r {
|
||
case '？':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeColon) { // :
|
||
switch r {
|
||
case '：':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodePipe) { // |
|
||
switch r {
|
||
case '｜':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeDoubleQuote) { // "
|
||
switch r {
|
||
case '＂':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeSingleQuote) { // '
|
||
switch r {
|
||
case '＇':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackQuote) { // `
|
||
switch r {
|
||
case '｀':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeDollar) { // $
|
||
switch r {
|
||
case '＄':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeSlash) { // /
|
||
switch r {
|
||
case '／':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackSlash) { // \
|
||
switch r {
|
||
case '＼':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeCrLf) { // CR LF
|
||
switch r {
|
||
case '␍', '␊':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeHash) { // #
|
||
switch r {
|
||
case '＃':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodePercent) { // %
|
||
switch r {
|
||
case '％':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeDel) { // DEL(0x7F)
|
||
switch r {
|
||
case '␡':
|
||
return true
|
||
}
|
||
}
|
||
if mask.Has(EncodeCtl) { // CTRL(0x01-0x1F)
|
||
if r > symbolOffset && r <= symbolOffset+0x1F {
|
||
return true
|
||
}
|
||
}
|
||
|
||
return false
|
||
})
|
||
}
|
||
// nothing to replace, return input
|
||
if index == -1 {
|
||
return in
|
||
}
|
||
|
||
var out bytes.Buffer
|
||
out.Grow(len(in))
|
||
out.WriteString(prefix)
|
||
// copy the clean part of the input and skip it
|
||
out.WriteString(in[:index])
|
||
in = in[index:]
|
||
var unquote, unquoteNext, skipNext bool
|
||
|
||
for i, r := range in {
|
||
if skipNext {
|
||
skipNext = false
|
||
continue
|
||
}
|
||
unquote, unquoteNext = unquoteNext, false
|
||
switch r {
|
||
case '␀': // SYMBOL FOR NULL
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(0)
|
||
}
|
||
continue
|
||
case QuoteRune:
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
unquoteNext = true
|
||
}
|
||
continue
|
||
}
|
||
if mask.Has(EncodeAsterisk) { // *
|
||
switch r {
|
||
case '＊':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeLtGt) { // <>
|
||
switch r {
|
||
case '＜', '＞':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeQuestion) { // ?
|
||
switch r {
|
||
case '？':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeColon) { // :
|
||
switch r {
|
||
case '：':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodePipe) { // |
|
||
switch r {
|
||
case '｜':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeDoubleQuote) { // "
|
||
switch r {
|
||
case '＂':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeSingleQuote) { // '
|
||
switch r {
|
||
case '＇':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackQuote) { // `
|
||
switch r {
|
||
case '｀':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeDollar) { // $
|
||
switch r {
|
||
case '＄':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeSlash) { // /
|
||
switch r {
|
||
case '／': // FULLWIDTH SOLIDUS
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeBackSlash) { // \
|
||
switch r {
|
||
case '＼': // FULLWIDTH REVERSE SOLIDUS
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeCrLf) { // CR LF
|
||
switch r {
|
||
case '␍', '␊':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - symbolOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeHash) { // %
|
||
switch r {
|
||
case '＃':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodePercent) { // %
|
||
switch r {
|
||
case '％':
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - fullOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeDel) { // DEL(0x7F)
|
||
switch r {
|
||
case '␡': // SYMBOL FOR DELETE
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(0x7F)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if mask.Has(EncodeCtl) { // CTRL(0x01-0x1F)
|
||
if r > symbolOffset && r <= symbolOffset+0x1F {
|
||
if unquote {
|
||
out.WriteRune(r)
|
||
} else {
|
||
out.WriteRune(r - symbolOffset)
|
||
}
|
||
continue
|
||
}
|
||
}
|
||
if unquote {
|
||
if mask.Has(EncodeInvalidUtf8) {
|
||
skipNext = appendUnquotedByte(&out, in[i:])
|
||
if skipNext {
|
||
continue
|
||
}
|
||
}
|
||
out.WriteRune(QuoteRune)
|
||
}
|
||
switch r {
|
||
case utf8.RuneError:
|
||
// append the real bytes instead of utf8.RuneError
|
||
_, l := utf8.DecodeRuneInString(in[i:])
|
||
out.WriteString(in[i : i+l])
|
||
continue
|
||
}
|
||
|
||
out.WriteRune(r)
|
||
}
|
||
if unquoteNext {
|
||
out.WriteRune(QuoteRune)
|
||
}
|
||
out.WriteString(suffix)
|
||
return out.String()
|
||
}
|
||
|
||
// FromStandardPath takes a / separated path in Standard encoding
|
||
// and converts it to a / separated path in this encoding.
|
||
func (mask MultiEncoder) FromStandardPath(s string) string {
|
||
return FromStandardPath(mask, s)
|
||
}
|
||
|
||
// FromStandardName takes name in Standard encoding and converts
|
||
// it in this encoding.
|
||
func (mask MultiEncoder) FromStandardName(s string) string {
|
||
return FromStandardName(mask, s)
|
||
}
|
||
|
||
// ToStandardPath takes a / separated path in this encoding
|
||
// and converts it to a / separated path in Standard encoding.
|
||
func (mask MultiEncoder) ToStandardPath(s string) string {
|
||
return ToStandardPath(mask, s)
|
||
}
|
||
|
||
// ToStandardName takes name in this encoding and converts
|
||
// it in Standard encoding.
|
||
func (mask MultiEncoder) ToStandardName(s string) string {
|
||
return ToStandardName(mask, s)
|
||
}
|
||
|
||
func appendQuotedBytes(w io.Writer, s string) {
|
||
for _, b := range []byte(s) {
|
||
_, _ = fmt.Fprintf(w, string(QuoteRune)+"%02X", b)
|
||
}
|
||
}
|
||
func appendUnquotedByte(w io.Writer, s string) bool {
|
||
if len(s) < 2 {
|
||
return false
|
||
}
|
||
u, err := strconv.ParseUint(s[:2], 16, 8)
|
||
if err != nil {
|
||
return false
|
||
}
|
||
n, _ := w.Write([]byte{byte(u)})
|
||
return n == 1
|
||
}
|
||
|
||
type identity struct{}
|
||
|
||
func (identity) Encode(in string) string { return in }
|
||
func (identity) Decode(in string) string { return in }
|
||
|
||
func (i identity) FromStandardPath(s string) string {
|
||
return FromStandardPath(i, s)
|
||
}
|
||
func (i identity) FromStandardName(s string) string {
|
||
return FromStandardName(i, s)
|
||
}
|
||
func (i identity) ToStandardPath(s string) string {
|
||
return ToStandardPath(i, s)
|
||
}
|
||
func (i identity) ToStandardName(s string) string {
|
||
return ToStandardName(i, s)
|
||
}
|
||
|
||
// Identity returns a Encoder that always returns the input value
|
||
func Identity() Encoder {
|
||
return identity{}
|
||
}
|
||
|
||
// FromStandardPath takes a / separated path in Standard encoding
|
||
// and converts it to a / separated path in the given encoding.
|
||
func FromStandardPath(e Encoder, s string) string {
|
||
if e == Standard {
|
||
return s
|
||
}
|
||
parts := strings.Split(s, "/")
|
||
encoded := make([]string, len(parts))
|
||
changed := false
|
||
for i, p := range parts {
|
||
enc := FromStandardName(e, p)
|
||
changed = changed || enc != p
|
||
encoded[i] = enc
|
||
}
|
||
if !changed {
|
||
return s
|
||
}
|
||
return strings.Join(encoded, "/")
|
||
}
|
||
|
||
// FromStandardName takes name in Standard encoding and converts
|
||
// it in the given encoding.
|
||
func FromStandardName(e Encoder, s string) string {
|
||
if e == Standard {
|
||
return s
|
||
}
|
||
return e.Encode(Standard.Decode(s))
|
||
}
|
||
|
||
// ToStandardPath takes a / separated path in the given encoding
|
||
// and converts it to a / separated path in Standard encoding.
|
||
func ToStandardPath(e Encoder, s string) string {
|
||
if e == Standard {
|
||
return s
|
||
}
|
||
parts := strings.Split(s, "/")
|
||
encoded := make([]string, len(parts))
|
||
changed := false
|
||
for i, p := range parts {
|
||
dec := ToStandardName(e, p)
|
||
changed = changed || dec != p
|
||
encoded[i] = dec
|
||
}
|
||
if !changed {
|
||
return s
|
||
}
|
||
return strings.Join(encoded, "/")
|
||
}
|
||
|
||
// ToStandardName takes name in the given encoding and converts
|
||
// it in Standard encoding.
|
||
func ToStandardName(e Encoder, s string) string {
|
||
if e == Standard {
|
||
return s
|
||
}
|
||
return Standard.Encode(e.Decode(s))
|
||
}
|