mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-23 20:26:39 +00:00
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package format
|
|
|
|
import (
|
|
"strings"
|
|
"unsafe"
|
|
)
|
|
|
|
const (
|
|
// SingleTermLine: beyond a certain length of string, all of the
|
|
// extra checks to handle quoting/not-quoting add a significant
|
|
// amount of extra processing time. Quoting in this manner only really
|
|
// effects readability on a single line, so a max string length that
|
|
// encompasses the maximum number of columns on *most* terminals was
|
|
// selected. This was chosen using the metric that 1080p is one of the
|
|
// most common display resolutions, and that a relatively small font size
|
|
// of 7 requires 223 columns. So 256 should be >= $COLUMNS (fullscreen)
|
|
// in 99% of usecases (these figures all pulled out of my ass).
|
|
SingleTermLine = 256
|
|
)
|
|
|
|
// IsSafeASCII checks whether string is printable (i.e. non-control char) ASCII text.
|
|
func IsSafeASCII(str string) bool {
|
|
for _, r := range str {
|
|
if (r < ' ' && r != '\t') ||
|
|
r >= 0x7f {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// ContainsSpaceOrTab checks if "s" contains space or tabs. EXPECTS ASCII.
|
|
func ContainsSpaceOrTab(s string) bool {
|
|
if i := strings.IndexByte(s, ' '); i >= 0 {
|
|
return true // note using indexbyte as it is ASM.
|
|
} else if i := strings.IndexByte(s, '\t'); i >= 0 {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// ContainsDoubleQuote checks if "s" contains a double quote. EXPECTS ASCII.
|
|
func ContainsDoubleQuote(s string) bool {
|
|
return (strings.IndexByte(s, '"') >= 0)
|
|
}
|
|
|
|
// AppendEscape will append 's' to 'dst' and escape any double quotes. EXPECTS ASCII.
|
|
func AppendEscape(dst []byte, str string) []byte {
|
|
for i := range str {
|
|
switch str[i] {
|
|
case '\\':
|
|
// Append delimited '\'
|
|
dst = append(dst, '\\', '\\')
|
|
|
|
case '"':
|
|
// Append delimited '"'
|
|
dst = append(dst, '\\', '"')
|
|
default:
|
|
// Append char as-is
|
|
dst = append(dst, str[i])
|
|
}
|
|
}
|
|
return dst
|
|
}
|
|
|
|
// Byte2Str returns 'c' as a string, escaping if necessary.
|
|
func Byte2Str(c byte) string {
|
|
switch c {
|
|
case '\a':
|
|
return `\a`
|
|
case '\b':
|
|
return `\b`
|
|
case '\f':
|
|
return `\f`
|
|
case '\n':
|
|
return `\n`
|
|
case '\r':
|
|
return `\r`
|
|
case '\t':
|
|
return `\t`
|
|
case '\v':
|
|
return `\v`
|
|
case '\\':
|
|
return `\\`
|
|
default:
|
|
if c < ' ' {
|
|
const hex = "0123456789abcdef"
|
|
return `\x` +
|
|
string(hex[c>>4]) +
|
|
string(hex[c&0xF])
|
|
}
|
|
return string(c)
|
|
}
|
|
}
|
|
|
|
// isNil will safely check if 'v' is nil without dealing with weird Go interface nil bullshit.
|
|
func isNil(i interface{}) bool {
|
|
type eface struct{ _type, data unsafe.Pointer } //nolint
|
|
return (*(*eface)(unsafe.Pointer(&i))).data == nil //nolint
|
|
}
|
|
|
|
// b2s converts a byteslice to string without allocation.
|
|
func b2s(b []byte) string {
|
|
return *(*string)(unsafe.Pointer(&b))
|
|
}
|