Created
December 16, 2020 06:43
-
-
Save alex-ant/405f3a4be184ea16e5449135d578a49a to your computer and use it in GitHub Desktop.
Replace variables "as words" without replacing the prefixes of other ones.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| import ( | |
| "fmt" | |
| ) | |
| func replaceByRange(s string, startIdx, endIdx int, new string) string { | |
| var res string | |
| var replaced bool | |
| for i := 0; i < len(s); i++ { | |
| if i < startIdx || i >= endIdx { | |
| res += string(s[i]) | |
| } else if !replaced { | |
| res += new | |
| replaced = true | |
| } | |
| } | |
| return res | |
| } | |
| func replaceVariables(s, old, new string) string { | |
| if len(old) > len(s) { | |
| return s | |
| } | |
| const varSymbols = "abcdefghijklmnopqrstuvwxyz_0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
| isVarSymbol := func(r byte) bool { | |
| for _, vs := range varSymbols { | |
| if vs == rune(r) { | |
| return true | |
| } | |
| } | |
| return false | |
| } | |
| var idxs [][2]int | |
| for i := 0; i < len(s); i++ { | |
| if i > len(s)-1 || i+len(old) > len(s) { | |
| break | |
| } | |
| window := s[i : i+len(old)] | |
| if window == old && ((i+len(old) < len(s) && !isVarSymbol(s[i+len(old)])) || i+len(old) == len(s)) { | |
| idxs = append(idxs, [2]int{i, i + len(old)}) | |
| } | |
| } | |
| for i := len(idxs) - 1; i >= 0; i-- { | |
| s = replaceByRange(s, idxs[i][0], idxs[i][1], new) | |
| } | |
| return s | |
| } | |
| func main() { | |
| fmt.Println(replaceVariables("var+var1+var2", "var", "rrr")) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment