87 lines
2 KiB
Nix
87 lines
2 KiB
Nix
# Credits to https://github.com/Misterio77/nix-colors/blob/b92df8f5eb1fa20d8e09810c03c9dc0d94ef2820/lib/core/conversions.nix#L87
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{
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lib,
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math ? import ./math.nix {inherit lib;},
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}: let
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hexToDecMap = {
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"0" = 0;
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"1" = 1;
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"2" = 2;
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"3" = 3;
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"4" = 4;
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"5" = 5;
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"6" = 6;
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"7" = 7;
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"8" = 8;
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"9" = 9;
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"a" = 10;
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"b" = 11;
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"c" = 12;
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"d" = 13;
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"e" = 14;
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"f" = 15;
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};
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base16To10 = exponent: scalar: scalar * math.pow 16 exponent;
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/*
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Converts a hexadecimal character to decimal.
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Only takes a string of length 1.
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Type: hexCharToDec :: string -> int
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Args:
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hex: A hexadecimal character.
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Example:
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hexCharToDec "5"
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=> 5
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hexCharToDec "e"
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=> 14
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hexCharToDec "A"
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=> 10
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*/
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hexCharToDec = hex: let
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inherit (lib) toLower;
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lowerHex = toLower hex;
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in
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if builtins.stringLength hex != 1
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then throw "Function only accepts a single character."
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else if hexToDecMap ? ${lowerHex}
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then hexToDecMap."${lowerHex}"
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else throw "Character ${hex} is not a hexadecimal value.";
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in rec {
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/*
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Converts from hexadecimal to decimal.
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Type: hexToDec :: string -> int
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Args:
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hex: A hexadecimal string.
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Example:
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hexadecimal "12"
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=> 18
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hexadecimal "FF"
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=> 255
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hexadecimal "abcdef"
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=> 11259375
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*/
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hexToDec = hex: let
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inherit (lib) stringToCharacters reverseList imap0 foldl;
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decimals = builtins.map hexCharToDec (stringToCharacters hex);
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decimalsAscending = reverseList decimals;
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decimalsPowered = imap0 base16To10 decimalsAscending;
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in
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foldl builtins.add 0 decimalsPowered;
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hexToIP = inputString: let
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len = builtins.stringLength inputString;
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oct1 = builtins.substring (len - 4) 2 inputString;
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oct2 = builtins.substring (len - 2) 2 inputString;
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oct1_dec = builtins.toString (hexToDec oct1);
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oct2_dec = builtins.toString (hexToDec oct2);
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in "${oct1_dec}.${oct2_dec}";
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hostnameToIP = inputString: let
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sha256Hash = builtins.hashString "sha256" inputString;
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in
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hexToIP sha256Hash;
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}
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