CompletionRecord.jsā¢1.36 kB
'use strict';
var $SyntaxError = require('es-errors/syntax');
var SLOT = require('internal-slot');
// https://262.ecma-international.org/6.0/#sec-completion-record-specification-type
var CompletionRecord = function CompletionRecord(type, value) {
if (!(this instanceof CompletionRecord)) {
return new CompletionRecord(type, value);
}
if (type !== 'normal' && type !== 'break' && type !== 'continue' && type !== 'return' && type !== 'throw') {
throw new $SyntaxError('Assertion failed: `type` must be one of "normal", "break", "continue", "return", or "throw"');
}
SLOT.set(this, '[[type]]', type);
SLOT.set(this, '[[value]]', value);
// [[target]] slot?
};
CompletionRecord.prototype.type = function type() {
return SLOT.get(this, '[[type]]');
};
CompletionRecord.prototype.value = function value() {
return SLOT.get(this, '[[value]]');
};
CompletionRecord.prototype['?'] = function ReturnIfAbrupt() {
var type = SLOT.get(this, '[[type]]');
var value = SLOT.get(this, '[[value]]');
if (type === 'throw') {
throw value;
}
return value;
};
CompletionRecord.prototype['!'] = function assert() {
var type = SLOT.get(this, '[[type]]');
if (type !== 'normal') {
throw new $SyntaxError('Assertion failed: Completion Record is not of type "normal"');
}
return SLOT.get(this, '[[value]]');
};
module.exports = CompletionRecord;