IavaScriptvm

An esoteric programming language created using Flex and Bison. It is made to imitate medieval catholic bibles, so it has some very strict formatting rules. Violation of the formatting rules will result in the compiler "excommunicating", "denouncing" the code written for being "blasphemous". The source code can be found at https://github.com/pellersz/IavaScriptvm

Syntax

The syntax of the language is not for the faint of heart, neither for the nonbelievers.

Keywords

The keywords are verbose and need to be separated from eachother and from literals. They will be discussed in the next sections.

Literals

Literals for integers use an extended version of the roman numerals, the original roman numerals are made of the characters: I, V, X, L, C, D, M; these are extended with the characters: T, R, E, W, Q, K, H, G, F, B, S, A. These extend the numbers as one would expect them to.

Literals also need to be preceded by the character †, furthermore 0 is represented by O.

So the integer 6421 would be represented by †TMCDXXI. Floats are similar, one needs to place a `.` after the whole part of the number, then write the fractional part in the same manner. for example 1.1 would be †I.I

Negative numbers need to be preceded by the `negans` keyword.

Array literals start with the keyword `haec est` and are followed by expressions which are divided by the keyword `et` and finished by the keyword `quae Domino servire vvlt`.

Commands

Commands can be declarations, conditional blocks, loop blocks, value assignments, and I/O operations.

Commands end with a `.` and are followed by a new line (and possibly additional white characters).

Variables

IavaScriptvm is a strongly typed language with main 2 types (integers and floats), and arrays made of these.

Variable names can only have characters from the latin alphabet, meaning `u`, `j` and `w` cannot be used in them. The first letter is uppercase, the rest is lowercase.

Declaring variables is tricky. When declaring, the first letter of a variable is written with ascii art letters. Depending on the ascii art "font", the type of the variable is decided. Floats are declared with the `AMC AAA01` font, integers are declared with the `AMC Slash` font. These letters are boxed in with `-` and `|` characters for clarity. After writing the name of the variable, an assignment needs to be placed with the `et renascitvr vt` keyword which is followed by the expression whose value will be assigned to the variable.

As an example, declaring an integer variable Temporalis with the value 0 would look like this:

-------------
| .s5SSSSs. |
|    SSS    |
|    S%S    |
|    S%S    |
|    S%S    |
|    S%S    |
|    `:;    |
|    ;,.    |
|    ;:'    |
-------------emporalis et renascitvr vt †O .

Arrays are similar, but they have to declare their size by writing a numeral on the box, for example, declaring a float array of size 3810 would look like this:

M-----------M†
| .S_SSSs    X
| .SS~SSSSS  |
| S%S   SSSS |
| S%S    S%S |
| S%S SSSS%S |
M S&S  SSS%S |
| S&S    S&S C
| S&S    S&S |
| S*S    S&S |
| S*S    S*S |
| S*S    S*S |
| SSS    S*S |
|        SP  |
|        Y   |
D------C-----Clba et renascitvr vt ....

For accessing an element of an array the `de` keyword is followed by the array then the `veni` keyword, than the index of the value is needed.

For example accessing the 2nd element of the array Alba is expressed like so: `de Alba veni †II`

Numeric operations

adding, subracting, multiplying, dividing, negating can be done with the keywords: `plvs`, `minvs`, `mvltiplica per`, `divisa per`, `negans`. For precedence, the IavaScriptvm analogue for `(`-s and `)`-s are the keywords, `vnitas` and `finis`.

Comments

Comments are written beside the program. If there are comments, a horizontal line of `|` characters needs to separate the program from the comments.

I/O operations

Reading into a variable is done with the `Legamvs verba domini nostri` keyword followed by the variable.

Writing a variable to the console is done with the `Lavdemvs dominvm in his verbis` keyword followed by the expression whose value we want to write.

Truth values

One can check equality and inequality between two expressios with the keywords `idem` and `non est idem`.

`Logical and` and `logical or` can be done with the keywords: `et` and `avt`.

Conditionals

A conditional statement starts with the keyword `Si peccatvm`, followed by a truth expression to evaluate and the keyword `oportet vos poenitenter cvm` then a newline.

After this, one can write commands that will only be evaluated if the the truth value is true.

Optionally, an alternative branch to this can be started with the `Alivd` keyword and a newline.

Finally, the conditional can be finished with the `et Dominvs dimittat vobis` keyword (and a `.`).

Loops

A loop is started by the keyword: `Dvm non svnt sine` and a truth expression, followed by the `oportet vos poenitenter cvm` keyword.

Commands can be written like with conditionals.

Finally, the loop can be finished with the `et Dominvs dimittat vobis` keyword.

The structure of a program

A IavaScriptvm program is written in multiple files with the extension `svm`, each file can have a maximum of 50 lines. A program also needs an enumeration file, which collects the files in order, by specifying the file paths.

A IavaScriptvm program starts with the `LIBER` keyword, followed by the name of the author in the next line.

After this, the commands are written.

Finally, a program is closed by the `Amen` keyword.

A tiny example

As an example, here is a program that reads in a number n, than it outputs a the nth fibonacci number.

Note: this is more than 50 lines, so it would need to be separated in two files.

LIBER                                                                                   
John                                                                                   
-------------
| .s    s.  |
|       SS. |
| sSs.  S%S |
| SS`S. S%S |
| SS `S.S%S |
| SS  `sS%S |
| SS    `:; |
| SS    ;,. |
| :;    ;:' |
-------------vmervs et renascitvr vt †O .
Legamvs verba domini nostri Nvmervs.
------------
| .s5SSSs. |
|          |
| sS       |
| SS       |
| SSSs.    |
| SS       |
| SS       |
| SS       |
| :;       |
------------ibovnvs et renascitvr vt †I .
------------
| .s5SSSs. |
|          |
| sS       |
| SS       |
| SSSs.    |
| SS       |
| SS       |
| SS       |
| :;       |
------------ibodvo et renascitvr vt †O .
-------------
| .s5SSSSs. |
|    SSS    |
|    S%S    |
|    S%S    |
|    S%S    |
|    S%S    |
|    `:;    |
|    ;,.    |
|    ;:'    |
-------------emporalis et renascitvr vt †O .
Dvm non svnt sine Nvmervs non est idem †O oportet vos poenitenter cvm
Temparils et renascitvr vt Fibovnvs.
Fibovnvs et renascitvr vt Fibovnvs plvs Fibodvo.
Fibodvo et renascitvr vt Temporalis.
et Dominvs dimittat vobis.
Lavdemvs dominvm in his verbis Fibovnvs.
Amen