Variable merging

[7ijme]

Because we are using bad practices anyway, when you have two variables with the same name, but different capitalization, there is a chance of the variables merging.

input:

const message = "hello there"
const Message = "hello there"

output:

const MESSAGE = "hello there"
const MESSAGE = "hello there"

The chance of this happening is slim, depending on the length of the variable: $\frac{1}{2^n}$.

[HelloWorld-n]

Not yet fully safe but:

---

adding file src/utils/cst-formatter/insertion.ts

interface Imap {
  [key: string]: string;
}

const requiredTokenTypes = [
  'VariableDeclarator',
  'FunctionDeclaration',
  'ClassDeclaration',
];
const map: Imap = Object.create(null);

function insertChars(ast: any) {
  ast.selectTokensByType('Identifier').forEach((token: any) => {
    if (token.parentElement.parentElement.type === 'FunctionDeclaration') {
      if (!map[token.value]) {
        const update = insertVariableValidCharRandomly(token.value);
        map[token.value] = update;
      }
    }
  });

  ast.selectTokensByType('Identifier').forEach((token: any) => {
    try {
      if (requiredTokenTypes.includes(token.parentElement.parentElement.type)) {
        if (!map[token.value]) {
          const update = insertVariableValidCharRandomly(token.value);
          map[token.value] = update;
        }
        const val = map[token.value];
        token.value = val;
        token._sourceCode = val;
        token._sourceCodeLines = [val];
      } else {
        const val = map[token.value] || token.value;
        token.value = val;
        token._sourceCode = val;
        token._sourceCodeLines = [val];
      }
    } catch (err) {
      // TODO: handle token errors
      // console.log(err);
    }
  });
}

function getRandomCharFromStr(str: string): string {
  return str[Math.floor(Math.random() * str.length)];
}

function insertVariableValidCharRandomly(str: string) {
  const charsValidEverywhere = '$ABCDEFGHIJKLMNOPQRSTUVWXYZ_';
  const charsValidConditional = '0123456789';
  const randomInsertionChances = 0.1;

  let modifiedStr = '';
  for (let i = 0; i <= str.length; i++) {
    if (Math.random() < randomInsertionChances){
      if (i === 0){
        modifiedStr += getRandomCharFromStr(charsValidEverywhere); 
      } else {
        modifiedStr += getRandomCharFromStr(charsValidEverywhere + charsValidConditional);
      }
    }
    if (i < str.length) {
      modifiedStr += str[i];
    }
  }
  return modifiedStr;
}

export { insertChars };

---

then modifying file /src/index.ts by adding

import { randomizeCase } from './utils/cst-formatter/case';

in front of https://github.com/rohitdhas/shittier/blob/5a01a098d1dec9986ce421766a327a9de3a142e4/src/index.ts#L5 and by adding

  insertChars(cst);

before https://github.com/rohitdhas/shittier/blob/5a01a098d1dec9986ce421766a327a9de3a142e4/src/index.ts#L14

---

would reduce chances for overlap to approx 1 / (  (2ⁿ) + (0.1 * 54ⁿ * 44)  )

---

Possibly causes overlap of variables that aren't even same size such as vrb and Varb

Possibly causes fnCtion to be renamed to function

Possibly causes LT to be renamed to let

Possibly causes clAss to be renamed to class

Similar problems to those may occur.