pseudocode-interpreter

My teacher really likes pseudocode but I don't, so here's an interpreter to at least make it runnable. Needs Python 3.10+ to run due to match case statements. Error messages might be slightly broken. Translator to translate the pseudocode to Python code is currently unfinished.

Docs for the pseudocode

• Operators

  • Mathematical operators
    • +, -, *, /, div, mod, %, ^, sqrt
    • 'div' is integer division.
    • 'mod' and '%' are synonymous.
  • Logical operators
    • <, <=, >, >=, ==, !=
    • "nicht, und, oder" as "not, and, or"

• Variables

  • Are global.
  • Do not need to be declared.
  • Do not have data types.

• Booleans

  • Are written as "true" or "false".

• Indentation

  • Is mandatory.
  • First indent that is found is taken as step value for the program.

• If statements

  • Are written as follows:

    falls condition
      dann ...
      sonst ...
    

    being equivalent to

    if condition
      then ...
      else ...
    

  • Multiple lines of code after a dann or sonst require indentation.

    falls condition
      dann ...
        ...
      sonst ...
    

  • else-/then-if statements require double indentation.

    falls condition1
      dann falls condition2
          dann ...
      sonst falls condition3
          dann ...
    

• Switch case statements

  • Are written as follows:

    falls value
      x: ...
      y: ...
        ...
      z: ...
      sonst: ...
    

    being equivalent to

    switch (value)
    {
      case x: ...
        break;
      case y: ...
        ...
        break;
      case z: ...
        break;
      default: ...
        break;
    }
    

  • Break statements don't exist.
  • value is stored into an internal variable and cannot be changed.
  • x/y/z get evaluated at time of comparison.
  • Any expression or variable is valid as x/y/z.

• While loops

  • Are written as follows:

    solange condition wiederhole
      ...
    

    being equivalent to

    while (condition)
    {
      ...
    }
    

• Do while loops

  • Are written as follows:

    wiederhole
      ...
    solange condition
    

    being equivalent to

    do
    {
      ...
    } while (condition)
    

• For loops

  • Are written as follows:

    für i von x bis y mit z wiederhole
      ...
    

    being equivalent to

    for (i = x; i <= y; i += z)
    {
      ...
    }
    

  • If mit z is ommitted the value defaults to 1