so simple dollar

so simple dollar is among the simplest programming languages. It only uses $ but the amount of the symbol determines the command.

Architecture

The program memory, resembles brainfuck's model, being defined as a composition of an infinite tally of cells, each storing a single signed integer of unbounded magnitude. Starting at the incipient member, a cell pointer marks at any instant the current active cell, amenable to queries and modifications.

Syntax

The following Extended Backus-Naur Form description (EBNF) applies to the so simple dollar programming language:

program      := whitespaces
             ,  startProgram
             ,  sepiment
             ,  { statement , sepiment }
             ,  endProgram
             ,  whitespaces
             ;
statement    := printBlock
             |  takeInput
             |  storeInput
             |  moveLeft
             |  moveRight
             ;

startProgram := "$" ;
endProgram   := "$$" ;
printBlock   := startPrint , { printCommand } , endPrint ;
startPrint   := "$$$" ;
endPrint     := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
printCommand := printLetterA
             |  printLetterB
             |  printLetterC
             |  printLetterD
             |  printLetterE
             |  printLetterF
             |  printLetterG
             |  printLetterH
             |  printLetterI
             |  printLetterJ
             |  printLetterK
             |  printLetterL
             |  printLetterM
             |  printLetterN
             |  printLetterO
             |  printLetterP
             |  printLetterQ
             |  printLetterR
             |  printLetterS
             |  printLetterT
             |  printLetterU
             |  printLetterV
             |  printLetterW
             |  printLetterX
             |  printLetterY
             |  printLetterZ
             |  printCell
             ;
printLetterA := "$$$$" ;
printLetterB := "$$$$$" ;
printLetterC := "$$$$$$" ;
printLetterD := "$$$$$$$" ;
printLetterE := "$$$$$$$$" ;
printLetterF := "$$$$$$$$$" ;
printLetterG := "$$$$$$$$$$" ;
printLetterH := "$$$$$$$$$$$" ;
printLetterI := "$$$$$$$$$$$$" ;
printLetterJ := "$$$$$$$$$$$$$" ;
printLetterK := "$$$$$$$$$$$$$$" ;
printLetterL := "$$$$$$$$$$$$$$$" ;
printLetterM := "$$$$$$$$$$$$$$$$" ;
printLetterN := "$$$$$$$$$$$$$$$$$" ;
printLetterO := "$$$$$$$$$$$$$$$$$$" ;
printLetterP := "$$$$$$$$$$$$$$$$$$$" ;
printLetterQ := "$$$$$$$$$$$$$$$$$$$$" ;
printLetterR := "$$$$$$$$$$$$$$$$$$$$$" ;
printLetterS := "$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterT := "$$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterU := "$$$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterV := "$$$$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterW := "$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterX := "$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterY := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
printLetterZ := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
printCell    := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;

takeInput    := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
storeInput   := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
moveRight    := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;
moveLeft     := "$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$" ;

sepiment     := whitespace , whitspaces ;
whitespaces  := { whitespace } ;
whitespace   := " " | "\t" | "\n" ;

Commands

Command	Description
$	Begin the program.
$$	End the program.
$$$	Begin printing a message.
$$$$	Print a letter (add one $ to indicate the letter; e.g.: $$$$$ = b).
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$	End the printing.
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$	Take a user input.
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$	Store the user input to a memory cell (like brainfuck).
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$	Switch to the right cell.
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$	Switch to the left cell.
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$	Print the character associated with the current cell's value (like brainfuck).

Examples

Hello, world!

This program outputs the text "helloworld":

$
$$$
$$$$$$$$$$$
$$$$$$$$
$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$
$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$

Cat program

A one-time cat program is implemented below:

$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$

Interpreter

• Common Lisp implementation of the so simple dollar programming language.