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package split
import (
"strconv"
"strings"
)
// 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).
const singleTermLine = 256
// appendQuote will append 'str' to 'buf', double quoting and escaping if needed.
func appendQuote(buf []byte, str string) []byte {
switch {
case len(str) > singleTermLine || !strconv.CanBackquote(str):
// Append quoted and escaped string
return strconv.AppendQuote(buf, str)
case (strings.IndexByte(str, '"') != -1):
// Double quote and escape string
buf = append(buf, '"')
buf = appendEscape(buf, str)
buf = append(buf, '"')
return buf
case (strings.IndexByte(str, ',') != -1):
// Double quote this string as-is
buf = append(buf, '"')
buf = append(buf, str...)
buf = append(buf, '"')
return buf
default:
// Append string as-is
return append(buf, str...)
}
}
// appendEscape will append 'str' to 'buf' and escape any double quotes.
func appendEscape(buf []byte, str string) []byte {
var delim bool
for i := range str {
switch {
case str[i] == '\\' && !delim:
// Set delim flag
delim = true
case str[i] == '"' && !delim:
// Append escaped double quote
buf = append(buf, `\"`...)
case delim:
// Append skipped slash
buf = append(buf, `\`...)
delim = false
fallthrough
default:
// Append char as-is
buf = append(buf, str[i])
}
}
return buf
}
|
