621 lines
19 KiB
JavaScript
621 lines
19 KiB
JavaScript
'use strict';
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const BLACK = '0,0,0';
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const WHITE = '255,255,255';
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const CMD = [
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'CF',
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'PF',
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'BF',
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'CB',
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'PB',
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'BB'
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];
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const ALTS = {
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'CF': ['CAMERA FORWARD', 'CAM FORWARD'],
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'PF': ['PROJECTOR FORWARD', 'PROJ FORWARD'],
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'BF': ['BLACK FORWARD', 'BLACK', 'BLANK FORWARD', 'BLANK'],
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'CB': ['CAMERA BACKWARD', 'CAM BACKWARD', 'CAMERA BACK', 'CAM BACK'],
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'PB': ['PROJECTOR FORWARD', 'PROJ FORWARD', 'PROJECTOR BACK', 'PROJ BACK'],
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'BB': ['BLACK BACKWARD', 'BLACK BACK', 'BLANK BACK'],
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'L ': ['LIGHT', 'COLOR', 'LAMP'],
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'F ': ['FADE']
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};
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/** helper functions */
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/** startswith function from lodash, do not want the entire lib for this
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* @param str {string} Text to evaluate
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* @param target {string} Text to compare string against
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* @param position {integer} Position in the string to make comparison at
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*
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* @returns {boolean} True for match, false for no match
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**/
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function startsWith(str, target, position) {
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const { length } = str;
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position = position == null ? 0 : position;
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if (position < 0) {
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position = 0;
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}
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else if (position > length) {
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position = length;
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}
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target = `${target}`;
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return str.slice(position, position + target.length) == target;
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}
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/** class Mscript */
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class Mscript {
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/**
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* @constructor
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* Create new Mscript interpreter
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**/
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constructor() {
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this.output = {};
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}
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/**
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* Clear the state of the script
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*/
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clear() {
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this.lines = [];
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this.cam = 0;
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this.proj = 0;
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this.color = '';
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this.loops = [];
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this.rec = -1;
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this.two = '';
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this.arr = [];
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this.light = [];
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this.target = 0; //move to target using CAM # or PROJ #
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this.dist = 0;
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this.variables = {};
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this.output = {};
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}
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/**
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* Main function, accepts multi-line string, parses into lines
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* and interprets the instructions from the text. Returns an array
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* of steps to be fed into the mcopy sequence.
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*
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* @param {string} text Mscript text to interpret
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* @param {function} callback Function to call when string is interpreted
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*
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* @returns {object} if callback is not provided
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*/
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interpret(text, callback) {
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this.clear();
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if (typeof text === 'undefined') {
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return this.fail('No input');
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}
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//split string into lines, each containing a command
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this.lines = text.split('\n');
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this.lines = this.lines.map(line => {
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line = line.replace(/\t+/g, ''); //strip tabs
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line = line.trim(); //remove excess whitespace before and after command
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line = line.toUpperCase();
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return line;
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});
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for (let line of this.lines) {
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this.two = line.substring(0, 2);
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if (CMD.indexOf(this.two) !== -1) {
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this.basic_cmd(line);
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}
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else if (startsWith(line, '@') || line.indexOf('@') !== -1) {
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this.variable(line);
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}
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else if (startsWith(line, 'LOOP')) {
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this.new_loop(line);
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}
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else if (startsWith(line, 'L ')) {
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this.light_state(line);
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}
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else if (startsWith(line, 'F ')) {
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this.new_loop(line, true);
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}
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else if (startsWith(line, 'END')) {
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this.end_loop(line);
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}
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else if (startsWith(line, 'CAM')) { //directly go to that frame (black?)
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this.move_cam(line);
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}
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else if (startsWith(line, 'PROJ')) { //directly go to that frame
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this.move_proj(line);
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}
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else if (startsWith(line, 'SET')) { //set that state
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this.set_state(line);
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}
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else if (startsWith(line, '#') || startsWith(line, '//')) {
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//comments
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//ignore while parsing
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}
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else if (startsWith(line, 'ALERT')) {
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}
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else if (startsWith(line, 'PAUSE')) {
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}
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}
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this.output.success = true;
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this.output.arr = this.arr; //all instructions
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this.output.light = this.light; //all light instructions
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this.output.cam = this.cam;
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this.output.proj = this.proj;
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if (typeof callback !== 'undefined') {
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//should only be invoked by running mscript.tests()
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callback(this.output);
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}
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else {
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return this.output;
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}
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}
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/**
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* Interprets variables for complex sequence behavior.
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* TODO: Fully implement, add test coverage
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*
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* @param {string} line Line containing a variable assignment
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*
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**/
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variable(line) {
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let parts = line.split('=');
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let key = parts[0];
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let value = parts[1];
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let update = false;
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if (value && value.indexOf('#') !== -1) {
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value = value.split('#')[0];
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}
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if (value && value.indexOf('//') !== -1) {
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value = value.split('//')[0];
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}
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if (value && value.indexOf('+') !== -1) {
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if (value)
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update = true;
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}
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if (line.indexOf('-') !== -1) {
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update = true;
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}
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if (line.indexOf(',') === -1) { //if not color string
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try {
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value = parseInt(value);
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}
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catch (err) {
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//supress parsing error
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}
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}
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//console.dir(parts)
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if (!this.variables[key] || update) {
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this.variables[key] = value;
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}
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//console.dir(this.variables)
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}
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/**
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* Replace variable with value at time of interpretation
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* TODO: Implement this please
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*
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* @param {string} line Line containing variable to be replaced with value
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*
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* @returns {string} New string to be interpreted
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**/
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variable_replace(line) {
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return line;
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}
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/**
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* Interpret a basic two character command
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*
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* @param {string} line Line of script to interpret
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*/
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basic_cmd(line) {
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if (this.rec !== -1) {
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//hold generated arr in state loop array
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this.loops[this.rec].arr
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.push.apply(this.loops[this.rec].arr, this.str_to_arr(line, this.two));
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this.loops[this.rec].light
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.push.apply(this.loops[this.rec].light, this.light_to_arr(line, this.two));
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}
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else {
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this.arr.push.apply(this.arr, this.str_to_arr(line, this.two));
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this.light.push.apply(this.light, this.light_to_arr(line, this.two));
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}
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}
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/**
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* Start a new loop
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*
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* @param {string} line Line to evaluate as either loop or fade
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* @param {boolean} fade Flag as boolean if true
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*/
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new_loop(line, fade) {
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this.rec++;
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this.loops[this.rec] = {
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arr: [],
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light: [],
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cam: 0,
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proj: 0,
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cmd: line + ''
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};
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if (fade) {
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this.fade(line);
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}
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}
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/**
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* Close the most recent loop
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*
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* @param {string} line Line to interpret
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*/
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end_loop(line) {
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let light_arr;
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let start;
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let end;
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let len;
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for (let x = 0; x < this.loop_count(this.loops[this.rec].cmd); x++) {
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light_arr = this.loops[this.rec].light;
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if (this.loops[this.rec].fade) {
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start = this.loops[this.rec].start;
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end = this.loops[this.rec].end;
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len = this.loops[this.rec].fade_len;
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light_arr = light_arr.map(l => {
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return this.fade_rgb(start, end, len, x);
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});
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}
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if (this.rec === 0) {
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this.arr.push.apply(this.arr, this.loops[this.rec].arr);
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this.light.push.apply(this.light, light_arr);
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}
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else if (this.rec >= 1) {
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this.loops[this.rec - 1].arr
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.push.apply(this.loops[this.rec - 1].arr, this.loops[this.rec].arr);
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this.loops[this.rec - 1].light
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.push.apply(this.loops[this.rec - 1].light, light_arr);
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}
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}
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this.update('END', this.loop_count(this.loops[this.rec].cmd));
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delete this.loops[this.rec];
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this.rec--;
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}
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/**
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* Move camera to explicitly-defined frame
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*
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* @param {string} line Line to interpret with camera move statement
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*/
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move_cam(line) {
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this.target = parseInt(line.split('CAM ')[1]);
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if (this.rec !== -1) {
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if (this.target > this.cam) {
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this.dist = this.target - this.cam;
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for (let x = 0; x < this.dist; x++) {
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this.loops[this.rec].arr.push('BF');
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this.loops[this.rec].light.push(BLACK);
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this.update('BF');
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}
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}
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else {
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this.dist = this.cam - this.target;
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for (let x = 0; x < this.dist; x++) {
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this.loops[this.rec].arr.push('BB');
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this.loops[this.rec].light.push(BLACK);
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this.update('BB');
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}
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}
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}
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else {
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if (this.target > this.cam) {
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this.dist = this.target - this.cam;
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for (let x = 0; x < this.dist; x++) {
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this.arr.push('BF');
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this.light.push(BLACK);
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this.update('BF');
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}
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}
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else {
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this.dist = this.cam - this.target;
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for (let x = 0; x < this.dist; x++) {
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this.arr.push('BB');
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this.light.push(BLACK);
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this.update('BB');
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}
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}
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}
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}
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/**
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* Move projector to explicitly-defined frame
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*
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* @param {string} line Line containing `move` statement to interpret
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*/
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move_proj(line) {
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this.target = parseInt(line.split('PROJ ')[1]);
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if (this.rec !== -1) {
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if (this.target > this.proj) {
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this.dist = this.target - this.proj;
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for (let x = 0; x < this.dist; x++) {
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this.loops[this.rec].arr.push('PF');
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this.loops[this.rec].light.push('');
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this.update('PF');
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}
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}
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else {
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this.dist = this.proj - this.target;
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for (let x = 0; x < this.dist; x++) {
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this.loops[this.rec].arr.push('PB');
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this.loops[this.rec].light.push('');
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this.update('PB');
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}
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}
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}
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else {
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if (this.target > this.proj) {
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this.dist = this.target - this.proj;
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for (let x = 0; x < this.dist; x++) {
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this.arr.push('PF');
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this.light.push('');
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this.update('PF');
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}
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}
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else {
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this.dist = this.proj - this.target;
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for (let x = 0; x < this.dist; x++) {
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this.arr.push('PB');
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this.light.push('');
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this.update('PB');
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}
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}
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}
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}
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/**
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* Set the state of either the cam or projector
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*
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* @param line {string} String containing set statement
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*/
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set_state(line) {
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if (startsWith(line, 'SET CAM')) {
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this.cam = parseInt(line.split('SET CAM')[1]);
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}
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else if (startsWith(line, 'SET PROJ')) {
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this.proj = parseInt(line.split('SET PROJ')[1]);
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}
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}
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/**
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* Return the last loop
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*
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* @returns {object}
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*/
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last_loop() {
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return this.loops[this.loops.length - 1];
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}
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/**
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* Return the second-last loop
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*
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* @returns {object} Loop array
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*/
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parent_loop() {
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return this.loops[this.loops.length - 2];
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}
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/**
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* Extract the loop count integer from a LOOP cmd
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*
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* @returns {integer} Loop count in string parsed into integer
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*/
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loop_count(str) {
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return parseInt(str.split(' ')[1]);
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}
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/**
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* Execute a fade of frame length, from color to another color
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*
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* @param {string} line Line containing a fade initiator
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*/
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fade(line) {
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let len = this.fade_count(line);
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let start = this.fade_start(line);
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let end = this.fade_end(line);
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this.loops[this.rec].start = start;
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this.loops[this.rec].end = end;
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this.loops[this.rec].fade = true;
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this.loops[this.rec].fade_count = 0;
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this.loops[this.rec].fade_len = len;
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}
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/**
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* Extract the fade length integer from a FADE cmd
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*
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* @param {string} str Line containing the length of fade in frames
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*/
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fade_count(str) {
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return parseInt(str.split(' ')[1]);
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}
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/**
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* Extract the start color from a string
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*
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* @param {string} str Line containing the start color value in a fade initiator
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*
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* @returns {array} Array containing RGB color values
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*/
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fade_start(str) {
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let color = str.split(' ')[2];
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return this.rgb(color.trim());
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}
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/**
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* Extract the end color from a string
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*
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* @param {string} str Line containing the end color value in a fade initiator
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*
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* @returns {array} Array containing RGB color values
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*/
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fade_end(str) {
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let color = str.split(' ')[3];
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return this.rgb(color.trim());
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}
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fade_rgb(start, end, len, x) {
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let cur = [];
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let diff;
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for (let i = 0; i < 3; i++) {
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if (x === len - 1) {
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cur[i] = end[i];
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}
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else if (start[i] >= end[i]) {
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diff = start[i] - end[i];
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cur[i] = start[i] - Math.round((diff / (len - 1)) * x);
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}
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else {
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diff = end[i] - start[i];
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cur[i] = start[i] + Math.round((diff / (len - 1)) * x);
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}
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}
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return this.rgb_str(cur);
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}
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/**
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* Parse string into array of RGB color values. 0-255 octet.
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*
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* @param {string} str String containing only color values as `#,#,#`
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**/
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rgb(str) {
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let rgb = str.split(',');
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return rgb.map((char) => {
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return parseInt(char);
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});
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}
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/**
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* Cast RGB color values as string
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*
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* @param {array} arr Array to join into string
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*
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* @returns {string} String of RGB values
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**/
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rgb_str(arr) {
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return arr.join(',');
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}
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/**
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* Increase the state of a specific object, such as the camera/projector,
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* by the value defined in val.
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*
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* @param {string} cmd String representing command to interpret and update state
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*/
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update(cmd, val = 1) {
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if (cmd === 'END') {
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//I don't understand this loop
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for (let i = 0; i < val; i++) {
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if (this.rec === 0) {
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this.cam += this.loops[this.rec].cam;
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this.proj += this.loops[this.rec].proj;
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}
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else if (this.rec >= 1) {
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this.loops[this.rec - 1].cam += this.loops[this.rec].cam;
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this.loops[this.rec - 1].proj += this.loops[this.rec].proj;
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}
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}
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}
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else if (cmd === 'CF') {
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if (this.rec === -1) {
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this.cam += val;
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}
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else {
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this.loops[this.rec].cam += val;
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}
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}
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else if (cmd === 'CB') {
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if (this.rec === -1) {
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this.cam -= val;
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}
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else {
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this.loops[this.rec].cam--;
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}
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}
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else if (cmd === 'PF') {
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if (this.rec === -1) {
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this.proj += val;
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}
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else {
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this.loops[this.rec].proj += val;
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}
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}
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else if (cmd === 'PB') {
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if (this.rec === -1) {
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this.proj -= val;
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}
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else {
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this.loops[this.rec].proj--;
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}
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}
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else if (cmd === 'BF') {
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if (this.rec === -1) {
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this.cam += val;
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}
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else {
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this.loops[this.rec].cam += val;
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}
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}
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else if (cmd === 'BB') {
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if (this.rec === -1) {
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this.cam -= val;
|
|
}
|
|
else {
|
|
this.loops[this.rec].cam -= val;
|
|
}
|
|
}
|
|
else if (cmd === 'L ') {
|
|
}
|
|
}
|
|
/**
|
|
* Split string on command, turn into array of commands
|
|
* as long as count variable. Default 1.
|
|
*
|
|
* @param {string} str String to split
|
|
* @param {string} cmd String representing command to split at
|
|
*
|
|
* @returns {array} Array containing commands
|
|
*/
|
|
str_to_arr(str, cmd) {
|
|
const cnt = str.split(cmd);
|
|
let c = parseInt(cnt[1]);
|
|
let arr = [];
|
|
if (cnt[1] === '') {
|
|
c = 1;
|
|
}
|
|
else {
|
|
c = parseInt(cnt[1]);
|
|
}
|
|
arr = new Array(c).fill(cmd);
|
|
this.update(cmd, c);
|
|
return arr;
|
|
}
|
|
/**
|
|
* Split a string on a command to extract data for light array
|
|
*
|
|
* @param {string} str String containing light command
|
|
* @param {string} cmd String representing command
|
|
*
|
|
* @returns {array} An RGB array containing the color values
|
|
*/
|
|
light_to_arr(str, cmd) {
|
|
const cnt = str.split(cmd);
|
|
let c = parseInt(cnt[1]);
|
|
let arr = [];
|
|
if (cnt[1] === '') {
|
|
c = 1;
|
|
}
|
|
else {
|
|
c = parseInt(cnt[1]);
|
|
}
|
|
for (let i = 0; i < c; i++) {
|
|
if (cmd === 'CF'
|
|
|| cmd === 'CB') {
|
|
arr.push(this.color);
|
|
}
|
|
else if (cmd === 'BF'
|
|
|| cmd === 'BB') {
|
|
arr.push(BLACK);
|
|
}
|
|
else {
|
|
arr.push('');
|
|
}
|
|
}
|
|
return arr;
|
|
}
|
|
/**
|
|
* Split a string to extract an rgb color value
|
|
*
|
|
* @param {string} Color string assign to color property
|
|
*/
|
|
light_state(str) {
|
|
//add parsers for other color spaces
|
|
const color = str.replace('L ', '').trim();
|
|
this.color = color;
|
|
}
|
|
/**
|
|
* Throw an error with specific message
|
|
*
|
|
* @param {string} msg Error message to print
|
|
*/
|
|
fail(msg) {
|
|
throw new Error(msg);
|
|
}
|
|
}
|
|
module.exports = Mscript;
|
|
//# sourceMappingURL=index.js.map
|