98 lines
1.8 KiB
Go
98 lines
1.8 KiB
Go
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package config
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import "fmt"
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import "strings"
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// import "unicode"
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var escapeCodeToRune = map[rune] rune {
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'\\': '\\',
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'a': '\a',
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'b': '\b',
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't': '\t',
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'n': '\n',
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'v': '\v',
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'f': '\f',
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'r': '\r',
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'"': '"',
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}
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var runeToEscapeCode = map[rune] rune { }
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func init () {
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for code, char := range escapeCodeToRune {
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runeToEscapeCode[char] = code
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}
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}
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func escape (str string) string {
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builder := strings.Builder { }
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for _, char := range str {
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code, escaped := runeToEscapeCode[char]
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switch {
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case escaped:
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fmt.Fprintf(&builder, "\\%c", code)
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// case !unicode.IsPrint(char):
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// fmt.Fprintf(&builder, "\\%o", char)
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default:
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builder.WriteRune(char)
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}
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}
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return builder.String()
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}
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func unescape (str string) (string, bool) {
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runes := []rune(str)
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builder := strings.Builder { }
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end := func () bool {
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return len(runes) < 1
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}
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next := func () {
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if !end() { runes = runes[1:] }
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}
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for !end() {
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if runes[0] == '\\' {
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if end() { return "", false }
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next()
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char, isEscape := escapeCodeToRune[runes[0]]
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switch {
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case isEscape:
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builder.WriteRune(char)
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next()
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// case isOctalDigit(runes[0]):
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// char = 0
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// for !end() && isOctalDigit(runes[0]) {
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// char *= 8
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// char += runes[0] - '0'
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// next()
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// }
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// builder.WriteRune(char)
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default:
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return "", false
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}
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} else {
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builder.WriteRune(runes[0])
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next()
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}
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}
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return builder.String(), true
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}
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func unquote (str string) (string, bool) {
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if len(str) < 2 { return "", false }
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if firstRune(str) != '"' { return "", false }
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if str[len(str) - 1] != '"' { return "", false }
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return str[1:len(str) - 1], true
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}
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func isOctalDigit (char rune) bool {
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return char >= '0' && char <= '7'
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}
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func firstRune (str string) rune {
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for _, char := range str {
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return char
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}
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return 0
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}
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