1 | import { IHtmlEngineHelper, IHandlebarsOptions } from './html-engine-helper.interface';
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2 |
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3 | export class ObjectLengthHelper implements IHtmlEngineHelper {
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4 | public helperFunc(context: any, obj: Object, operator: string, length: number) {
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5 | let len = arguments.length - 1;
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6 | let options: IHandlebarsOptions = arguments[len];
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7 |
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8 | if (typeof obj !== 'object') {
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9 | return options.inverse(context);
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10 | }
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11 |
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12 | let size = 0,
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13 | key;
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14 | for (key in obj) {
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15 | if (obj.hasOwnProperty(key)) {
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16 | size++;
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17 | }
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18 | }
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19 |
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20 | let result;
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21 | switch (operator) {
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22 | case '===':
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23 | result = size === length;
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24 | break;
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25 | case '!==':
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26 | result = size !== length;
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27 | break;
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28 | case '>':
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29 | result = size > length;
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30 | break;
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31 | default: {
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32 | throw new Error('helper {{objectLength}}: invalid operator: `' + operator + '`');
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33 | }
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34 | }
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35 |
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36 | if (result === false) {
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37 | return options.inverse(context);
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38 | }
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39 | return options.fn(context);
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40 | }
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41 | }
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