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reflect: remove strconv.go

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Randy Reddig
2025-03-17 07:42:09 -07:00
committed by Ron Evans
parent c2af1d183e
commit 24eed9e376
1 changed files with 0 additions and 347 deletions
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src/reflect/strconv.go
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// Copyright 2009 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.
package reflect
import (
"unicode/utf8"
)
// errSyntax indicates that a value does not have the right syntax for the target type.
var errSyntax = badSyntax{}
type badSyntax struct{}
func (badSyntax) Error() string {
return "invalid syntax"
}
func unhex(b byte) (v rune, ok bool) {
c := rune(b)
switch {
case '0' <= c && c <= '9':
return c - '0', true
case 'a' <= c && c <= 'f':
return c - 'a' + 10, true
case 'A' <= c && c <= 'F':
return c - 'A' + 10, true
}
return
}
const (
lowerhex = "0123456789abcef"
)
// unquoteChar decodes the first character or byte in the escaped string
// or character literal represented by the string s.
// It returns four values:
//
// 1. value, the decoded Unicode code point or byte value;
// 2. multibyte, a boolean indicating whether the decoded character requires a multibyte UTF-8 representation;
// 3. tail, the remainder of the string after the character; and
// 4. an error that will be nil if the character is syntactically valid.
//
// The second argument, quote, specifies the type of literal being parsed
// and therefore which escaped quote character is permitted.
// If set to a single quote, it permits the sequence \' and disallows unescaped '.
// If set to a double quote, it permits \" and disallows unescaped ".
// If set to zero, it does not permit either escape and allows both quote characters to appear unescaped.
func unquoteChar(s string, quote byte) (value rune, multibyte bool, tail string, err error) {
// easy cases
if len(s) == 0 {
err = errSyntax
return
}
switch c := s[0]; {
case c == quote && (quote == '\'' || quote == '"'):
err = errSyntax
return
case c >= utf8.RuneSelf:
r, size := utf8.DecodeRuneInString(s)
return r, true, s[size:], nil
case c != '\\':
return rune(s[0]), false, s[1:], nil
}
// hard case: c is backslash
if len(s) <= 1 {
err = errSyntax
return
}
c := s[1]
s = s[2:]
switch c {
case 'a':
value = '\a'
case 'b':
value = '\b'
case 'f':
value = '\f'
case 'n':
value = '\n'
case 'r':
value = '\r'
case 't':
value = '\t'
case 'v':
value = '\v'
case 'x', 'u', 'U':
n := 0
switch c {
case 'x':
n = 2
case 'u':
n = 4
case 'U':
n = 8
}
var v rune
if len(s) < n {
err = errSyntax
return
}
for j := 0; j < n; j++ {
x, ok := unhex(s[j])
if !ok {
err = errSyntax
return
}
v = v<<4 | x
}
s = s[n:]
if c == 'x' {
// single-byte string, possibly not UTF-8
value = v
break
}
if v > utf8.MaxRune {
err = errSyntax
return
}
value = v
multibyte = true
case '0', '1', '2', '3', '4', '5', '6', '7':
v := rune(c) - '0'
if len(s) < 2 {
err = errSyntax
return
}
for j := 0; j < 2; j++ { // one digit already; two more
x := rune(s[j]) - '0'
if x < 0 || x > 7 {
err = errSyntax
return
}
v = (v << 3) | x
}
s = s[2:]
if v > 255 {
err = errSyntax
return
}
value = v
case '\\':
value = '\\'
case '\'', '"':
if c != quote {
err = errSyntax
return
}
value = rune(c)
default:
err = errSyntax
return
}
tail = s
return
}
// unquote interprets s as a single-quoted, double-quoted,
// or backquoted Go string literal, returning the string value
// that s quotes. (If s is single-quoted, it would be a Go
// character literal; unquote returns the corresponding
// one-character string.)
func unquote(s string) (string, error) {
n := len(s)
if n < 2 {
return "", errSyntax
}
quote := s[0]
if quote != s[n-1] {
return "", errSyntax
}
s = s[1 : n-1]
if quote == '`' {
if contains(s, '`') {
return "", errSyntax
}
if contains(s, '\r') {
// -1 because we know there is at least one \r to remove.
buf := make([]byte, 0, len(s)-1)
for i := 0; i < len(s); i++ {
if s[i] != '\r' {
buf = append(buf, s[i])
}
}
return string(buf), nil
}
return s, nil
}
if quote != '"' && quote != '\'' {
return "", errSyntax
}
if contains(s, '\n') {
return "", errSyntax
}
// Is it trivial? Avoid allocation.
if !contains(s, '\\') && !contains(s, quote) {
switch quote {
case '"':
if utf8.ValidString(s) {
return s, nil
}
case '\'':
r, size := utf8.DecodeRuneInString(s)
if size == len(s) && (r != utf8.RuneError || size != 1) {
return s, nil
}
}
}
var runeTmp [utf8.UTFMax]byte
buf := make([]byte, 0, 3*len(s)/2) // Try to avoid more allocations.
for len(s) > 0 {
c, multibyte, ss, err := unquoteChar(s, quote)
if err != nil {
return "", err
}
s = ss
if c < utf8.RuneSelf || !multibyte {
buf = append(buf, byte(c))
} else {
n := utf8.EncodeRune(runeTmp[:], c)
buf = append(buf, runeTmp[:n]...)
}
if quote == '\'' && len(s) != 0 {
// single-quoted must be single character
return "", errSyntax
}
}
return string(buf), nil
}
func quote(s string) string {
buf := make([]byte, 0, 3*len(s)/2)
const quote = '"'
buf = append(buf, quote)
for width := 0; len(s) > 0; s = s[width:] {
r := rune(s[0])
width = 1
if r >= utf8.RuneSelf {
r, width = utf8.DecodeRuneInString(s)
}
if width == 1 && r == utf8.RuneError {
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[s[0]>>4])
buf = append(buf, lowerhex[s[0]&0xF])
continue
}
buf = appendEscapedRune(buf, r)
}
buf = append(buf, quote)
return string(buf)
}
func appendEscapedRune(buf []byte, r rune) []byte {
const quote = '"'
var runeTmp [utf8.UTFMax]byte
if r == rune(quote) || r == '\\' { // always backslashed
buf = append(buf, '\\')
buf = append(buf, byte(r))
return buf
}
if isPrint(r) {
n := utf8.EncodeRune(runeTmp[:], r)
buf = append(buf, runeTmp[:n]...)
return buf
}
switch r {
case '\a':
buf = append(buf, `\a`...)
case '\b':
buf = append(buf, `\b`...)
case '\f':
buf = append(buf, `\f`...)
case '\n':
buf = append(buf, `\n`...)
case '\r':
buf = append(buf, `\r`...)
case '\t':
buf = append(buf, `\t`...)
case '\v':
buf = append(buf, `\v`...)
default:
switch {
case r < ' ' || r == 0x7f:
buf = append(buf, `\x`...)
buf = append(buf, lowerhex[byte(r)>>4])
buf = append(buf, lowerhex[byte(r)&0xF])
case !utf8.ValidRune(r):
r = 0xFFFD
fallthrough
case r < 0x10000:
buf = append(buf, `\u`...)
for s := 12; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
default:
buf = append(buf, `\U`...)
for s := 28; s >= 0; s -= 4 {
buf = append(buf, lowerhex[r>>uint(s)&0xF])
}
}
}
return buf
}
// This is only used for struct tags. Assume
func isPrint(r rune) bool {
if r <= 0xFF {
if 0x20 <= r && r <= 0x7E {
// All the ASCII is printable from space through DEL-1.
return true
}
if 0xA1 <= r && r <= 0xFF {
// Similarly for ¡ through ÿ...
return r != 0xAD // ...except for the bizarre soft hyphen.
}
return false
}
// TinyGo: Skip all other unicode processing
return false
}
// contains reports whether the string contains the byte c.
func contains(s string, c byte) bool {
return indexByteString(s, c) != -1
}
// Index finds the index of the first instance of the specified byte in the string.
// If the byte is not found, this returns -1.
func indexByteString(s string, c byte) int {
for i := 0; i < len(s); i++ {
if s[i] == c {
return i
}
}
return -1
}