Getting a list of keys next to a given key according to a physical layout of the keyboard. Converted from zxcvbn code. Only to realize I can't use this for English Dvorak.

keys_next_to_keys.dart

Map<String, List<String>> _DICT_KEYBOARD_KEY_CONNECTION = {
    "!": ["`~", null, null, "2@", "qQ", null],
    '"': [";:", "[{", "]}", null, null, "/?"],
    "#": ["2@", null, null, "4\$", "eE", "wW"],
    "\$": ["3#", null, null, "5%", "rR", "eE"],
    "%": ["4\$", null, null, "6^", "tT", "rR"],
    "&": ["6^", null, null, "8*", "uU", "yY"],
    "'": [";:", "[{", "]}", null, null, "/?"],
    "(": ["8*", null, null, "0)", "oO", "iI"],
    ")": ["9(", null, null, "-_", "pP", "oO"],
    "*": ["7&", null, null, "9(", "iI", "uU"],
    "+": ["-_", null, null, null, "]}", "[{"],
    ",": ["mM", "kK", "lL", ".>", null, null],
    "-": ["0)", null, null, "=+", "[{", "pP"],
    ".": [",<", "lL", ";:", "/?", null, null],
    "/": [".>", ";:", "'\"", null, null, null],
    "0": ["9(", null, null, "-_", "pP", "oO"],
    1: ["`~", null, null, "2@", "qQ", null],
    2: ["1!", null, null, "3#", "wW", "qQ"],
    3: ["2@", null, null, "4\$", "eE", "wW"],
    4: ["3#", null, null, "5%", "rR", "eE"],
    5: ["4\$", null, null, "6^", "tT", "rR"],
    6: ["5%", null, null, "7&", "yY", "tT"],
    7: ["6^", null, null, "8*", "uU", "yY"],
    8: ["7&", null, null, "9(", "iI", "uU"],
    9: ["8*", null, null, "0)", "oO", "iI"],
    ":": "lL,pP,[{,'\",/?,.>".split(","),
    ";": "lL,pP,[{,'\",/?,.>".split(","),
    "<": ["mM", "kK", "lL", ".>", null, null],
    "=": ["-_", null, null, null, "]}", "[{"],
    ">": [",<", "lL", ";:", "/?", null, null],
    "?": [".>", ";:", "'\"", null, null, null],
    "@": ["1!", null, null, "3#",
    "wW", "qQ"
    ],
    "A": [null, "qQ", "wW", "sS", "zZ", null],
    "B": ["vV", "gG", "hH", "nN", null, null],
    "C": ["xX", "dD", "fF", "vV", null, null],
    "D": "sS,eE,rR,fF,cC,xX".split(","),
    "E": "wW,3#,4\$,rR,dD,sS".split(","),
    "F": "dD,rR,tT,gG,vV,cC".split(","),
    "G": "fF,tT,yY,hH,bB,vV".split(","),
    "H": "gG,yY,uU,jJ,nN,bB".split(","),
    "I": "uU,8*,9(,oO,kK,jJ".split(","),
    "J": "hH,uU,iI,kK,mM,nN".split(","),
    "K": "jJ iI oO lL ,< mM".split(" "),
    "L": "kK oO pP ;: .> ,<".split(" "),
    "M": ["nN", "jJ", "kK", ",<", null, null],
    "N": ["bB", "hH", "jJ", "mM", null, null],
    "O": "iI,9(,0),pP,lL,kK".split(","),
    "P": "oO,0),-_,[{,;:,lL".split(","),
    "Q": [null, "1!", "2@", "wW", "aA", null],
    "R": "eE,4\$,5%,tT,fF,dD".split(","),
    "S": "aA,wW,eE,dD,xX,zZ".split(","),
    "T": "rR,5%,6^,yY,gG,fF".split(","),
    "U": "yY,7&,8*,iI,jJ,hH".split(","),
    "V": ["cC", "fF", "gG", "bB", null, null],
    "W": "qQ,2@,3#,eE,sS,aA".split(","),
    "X": ["zZ", "sS", "dD", "cC", null, null],
    "Y": "tT,6^,7&,uU,hH,gG".split(","),
    "Z": [null, "aA", "sS", "xX", null, null],
    "[": "pP,-_,=+,]},'\",;:".split(","),
    "\\": ["]}", null, null, null, null, null],
    "]": ["[{", "=+", null, "\\|", null, "'\""],
    "^": ["5%", null, null, "7&", "yY", "tT"],
    "_": ["0)", null, null, "=+", "[{", "pP"],
    "`": [null, null, null, "1!", null, null],
    "a": [null, "qQ", "wW", "sS", "zZ", null],
    "b": ["vV", "gG", "hH", "nN", null, null],
    "c": ["xX", "dD", "fF", "vV", null, null],
    "d": "sS,eE,rR,fF,cC,xX".split(","),
    "e": "wW,3#,4\$,rR,dD,sS".split(","),
    "f": "dD,rR,tT,gG,vV,cC".split(","),
    "g": "fF,tT,yY,hH,bB,vV".split(","),
    "h": "gG,yY,uU,jJ,nN,bB".split(","),
    "i": "uU,8*,9(,oO,kK,jJ".split(","),
    "j": "hH,uU,iI,kK,mM,nN".split(","),
    "k": "jJ iI oO lL ,< mM".split(" "),
    "l": "kK oO pP ;: .> ,<".split(" "),
    "m": ["nN", "jJ", "kK", ",<", null, null],
    "n": ["bB", "hH", "jJ", "mM", null, null],
    "o": "iI,9(,0),pP,lL,kK".split(","),
    "p": "oO,0),-_,[{,;:,lL".split(","),
    "q": [null, "1!", "2@", "wW", "aA", null],
    "r": "eE,4\$,5%,tT,fF,dD".split(","),
    "s": "aA,wW,eE,dD,xX,zZ".split(","),
    "t": "rR,5%,6^,yY,gG,fF".split(","),
    "u": "yY,7&,8*,iI,jJ,hH".split(","),
    "v": ["cC", "fF", "gG", "bB", null, null],
    "w": "qQ,2@,3#,eE,sS,aA".split(","),
    "x": ["zZ", "sS", "dD", "cC", null, null],
    "y": "tT,6^,7&,uU,hH,gG".split(","),
    "z": [null, "aA", "sS", "xX", null, null],
    "{": "pP,-_,=+,]},'\",;:".split(","),
    "|": ["]}", null, null, null, null, null],
    "}": ["[{", "=+", null, "\\|", null, "'\""],
    "~": [null, null, null, "1!", null, null]
};

Map<String, List<String>> _DICT_KEYBOARD_NUMBER_CONNECTION = {
    "*": ["/", null, null, null, "-", "+", "9", "8"],
    "+": ["9", "*", "-", null, null, null, null, "6"],
    "-": ["*", null, null, null, null, null, "+", "9"],
    ".": ["0", "2", "3", null, null, null, null, null],
    "/": [null, null, null, null, "*", "9", "8", "7"],
    "0": [null, "1", "2", "3", ".", null, null, null],
    1: [null, null, "4", "5", "2", "0", null, null],
    2: ["1", "4", "5", "6", "3", ".", "0", null],
    3: ["2", "5", "6", null, null, null, ".", "0"],
    4: [null, null, "7", "8", "5", "2", "1", null],
    5: "4,7,8,9,6,3,2,1".split(","),
    6: ["5", "8", "9", "+", null, null, "3", "2"],
    7: [null, null, null, "/", "8", "5", "4", null],
    8: ["7", null, "/", "*", "9", "6", "5", "4"],
    9: ["8", "/", "*", "-", "+", null, "6", "5"]
};

void main() {
  // Find keys next to "Q.w.E.R.T.Y.!" according to a physical layout of the keyboard.
  "QwERTY!".codeUnits.forEach((int keyCode) {
    var key = new String.fromCharCode(keyCode);
    final List<String> nextKeys = _DICT_KEYBOARD_KEY_CONNECTION[key];
    if (nextKeys != null)
      nextKeys.forEach((String nk) {
        if (nk != null)
          print("$key => $nk");
      });
  });
}

keys_next_to_keys.output.log

Q => 1!
Q => 2@
Q => wW
Q => aA
w => qQ
w => 2@
w => 3#
w => eE
w => sS
w => aA
E => wW
E => 3#
E => 4$
E => rR
E => dD
E => sS
R => eE
R => 4$
R => 5%
R => tT
R => fF
R => dD
T => rR
T => 5%
T => 6^
T => yY
T => gG
T => fF
Y => tT
Y => 6^
Y => 7&
Y => uU
Y => hH
Y => gG
! => `~
! => 2@
! => qQ