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core.js
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core.js
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import signals from 'signals.js';
import {tapeToJson} from 'loader';
/* Symbols */
let EMPTY = {symbol: 'empty'},
RED = {symbol: 'red'},
BLUE = {symbol: 'blue'},
GREEN = {symbol: 'green'},
YELLOW = {symbol: 'yellow'},
symbols = {
R: RED,
B: BLUE,
G: GREEN,
Y: YELLOW
};
export {RED, GREEN, BLUE, YELLOW, symbols};
/* Tape
Represents an ordered queue of symbols
*/
export class Tape {
constructor() {
this.symbols = [];
this.changed = new signals.Signal();
}
head() {
if (this.symbols.length > 0) {
return this.symbols[0];
} else {
return core.EMPTY;
}
}
pop() {
if (this.symbols.length > 0) {
var popped = this.symbols.shift();
this.changed.dispatch('pop');
return popped;
} else {
return core.EMPTY;
}
}
append(s) {
this.symbols.push(s);
this.changed.dispatch('append');
}
static clone(otherTape) {
var newTape = new Tape();
newTape.symbols = otherTape.symbols.slice(0);
return newTape;
}
static isEqual(t1, t2) {
return tapeToJson(t1) == tapeToJson(t2);
}
};
export default {
Tape: Tape,
RED: RED,
GREEN: GREEN,
BLUE: BLUE,
YELLOW: YELLOW,
symbols: symbols
};