Source: sketch.js

/*******************************************************************************
 *
 *	@file sketch.js A Brain Fuck Interpreter
 *
 *	@author Omar Essilfie-Quaye <omareq08+githubio@gmail.com>
 *	@version 1.0
 *	@date 07-February-2026
 *	@link https://omareq.github.io/bf-interpreter/
 *	@link https://omareq.github.io/bf-interpreter/docs/
 *
 *******************************************************************************
 *
 *                   GNU General Public License V3.0
 *                   --------------------------------
 *
 *   Copyright (C) 2026 Omar Essilfie-Quaye
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 *****************************************************************************/
"use strict";

let lastProgram = undefined;
let lastInput = undefined;
let sourceCodeAreaHandle = undefined;
let inputTextAreaHandle = undefined;

/**
 * Read the string in the source code text area and return it
 *
 * @returns {String} - The raw program string
 */
function getRawProgramTxt() {
	if(sourceCodeAreaHandle == undefined) {
		sourceCodeAreaHandle = document.getElementById("source-code-text");
	}
	return sourceCodeAreaHandle.textContent;
}

/**
 * Read the string in the input text area and return it
 *
 * @returns {String} - The raw input string
 */
function getInputString() {
	if(inputTextAreaHandle == undefined) {
		inputTextAreaHandle = document.getElementById("input-text");
	}
	return inputTextAreaHandle.textContent;
}

/**
 * Convert a string to ASCII char codes
 *
 * @returns {Array<Number>} - The array of ASCII char codes
 */
function getCharCodes(inputString) {
    let charCodeArr = new Array(inputString.length);
    for (let i = 0; i < inputString.length; i++) {
        charCodeArr[i] = inputString.charCodeAt(i);
    }
    return charCodeArr;
}

/**
 * Run the current BF program that is in the input text area
 */
function run() {
	const rawProgram = getRawProgramTxt();
	const programTxt = preProcess(rawProgram);
	const input = getInputString();

// TODO: check if input is also the same
	if(lastProgram != undefined && programTxt.join("") == lastProgram.join("") &&
		lastInput != undefined && input == lastInput) {
		console.log("Same program and input not running again.");
		return;
	}

	const asciiCodes = getCharCodes(input);

	const program = new BFProgram(parse(programTxt));
	let cpu = new BFCpu(8, program, 30000, asciiCodes);
	cpu.execute();
	lastProgram = programTxt;
	lastInput = input;
}

/**
 * Minify the code in the source code input area
 */
function minify() {
	const rawProgram = getRawProgramTxt();
	const programTxt = preProcess(rawProgram);
	sourceCodeAreaHandle.textContent = programTxt.join("");
}


/**
 * p5.js setup function, creates canvas.
 */
function setup() {
	let cnvSize;
	let cnv = createCanvas(1,1);
	cnv.parent('sketch');

	sourceCodeAreaHandle = document.getElementById("source-code-text");
	inputTextAreaHandle = document.getElementById("input-text");

	let runButton = createButton("Run", "value");
	runButton.parent("run-button");
	runButton.mousePressed(run);

	let minifyButton = createButton("Minify", "value");
	minifyButton.parent("minify-button");
	minifyButton.mousePressed(minify);
	background(255);
}

/**
 * p5.js draw function, is run every frame to create the desired animation
 */
function draw() {
}