18th October

Implementing the Pratt parser: If Expression

If expressions in monkey programming language looks just like any other. Ex:

if (x > y) {
  return x;
} else {
  return y;
}

Or

if (x > y) {
  return x;
}

if-else conditionals in monkey are expressions, i.e. they produce a value. The return is implied to be the last line if not explicitly returned. Although, it's obvious but for sake of clarity:

if (<condition>) <consequence> else <alternative>

Consuquence & alternative's are block statements so they get parsed like regular statements.

Once the structured is established, the rest is fairly simple as it does not vary vastly from the rest of the program.

Commit:e47d5c8 (opens in a new tab)