mirror of https://github.com/jkjoy/sunpeiwen.git
54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $SyntaxError = GetIntrinsic('%SyntaxError%');
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var SLOT = require('internal-slot');
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// https://262.ecma-international.org/6.0/#sec-completion-record-specification-type
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var CompletionRecord = function CompletionRecord(type, value) {
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if (!(this instanceof CompletionRecord)) {
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return new CompletionRecord(type, value);
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}
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if (type !== 'normal' && type !== 'break' && type !== 'continue' && type !== 'return' && type !== 'throw') {
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throw new $SyntaxError('Assertion failed: `type` must be one of "normal", "break", "continue", "return", or "throw"');
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}
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SLOT.set(this, '[[type]]', type);
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SLOT.set(this, '[[value]]', value);
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// [[target]] slot?
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};
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CompletionRecord.prototype.type = function type() {
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return SLOT.get(this, '[[type]]');
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};
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CompletionRecord.prototype.value = function value() {
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return SLOT.get(this, '[[value]]');
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};
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CompletionRecord.prototype['?'] = function ReturnIfAbrupt() {
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var type = SLOT.get(this, '[[type]]');
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var value = SLOT.get(this, '[[value]]');
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if (type === 'normal') {
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return value;
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}
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if (type === 'throw') {
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throw value;
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}
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throw new $SyntaxError('Completion Record is not of type "normal" or "throw": other types not supported');
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};
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CompletionRecord.prototype['!'] = function assert() {
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var type = SLOT.get(this, '[[type]]');
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if (type !== 'normal') {
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throw new $SyntaxError('Assertion failed: Completion Record is not of type "normal"');
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}
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return SLOT.get(this, '[[value]]');
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};
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module.exports = CompletionRecord;
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