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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package qwerty_cipher | ||
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| // 判断给定的rune是否是英文字母 | ||
| func isLetter(c rune) bool { | ||
| return isLowercaseLetter(c) || isUppercaseLetter(c) | ||
| } | ||
|
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||
| // 判断是否是小写字母 | ||
| func isLowercaseLetter(c rune) bool { | ||
| return c >= 'a' && c <= 'z' | ||
| } | ||
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||
| // 判断是否是大写字母 | ||
| func isUppercaseLetter(c rune) bool { | ||
| return c >= 'A' && c <= 'Z' | ||
| } | ||
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||
| // 把字母转换为大写 | ||
| func toUppercase(c rune) rune { | ||
| if isLowercaseLetter(c) { | ||
| c -= 32 | ||
| } | ||
| return c | ||
| } | ||
|
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||
| // 把字母转换为小写 | ||
| func toLowercase(c rune) rune { | ||
| if isUppercaseLetter(c) { | ||
| c += 32 | ||
| } | ||
| return c | ||
| } | ||
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| // b跟随a的大小写特性 | ||
| func followUppercaseOrLowercase(a, b rune) rune { | ||
| if isUppercaseLetter(a) { | ||
| b = toUppercase(b) | ||
| } else if isLowercaseLetter(a) { | ||
| b = toLowercase(b) | ||
| } | ||
| return b | ||
| } | ||
|
|
||
| // 把字符转换为键盘布局切片对应的下标，比如a和A转换为0，b和B转换为1，以此类推 | ||
| func toMappingIndex(c rune) int { | ||
| if isLowercaseLetter(c) { | ||
| return int(c - 'a') | ||
| } else if isUppercaseLetter(c) { | ||
| return int(c - 'A') | ||
| } else { | ||
| return -1 | ||
| } | ||
| } | ||
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