| 1 | import { IHtmlEngineHelper, IHandlebarsOptions } from './html-engine-helper.interface';
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| 2 |
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| 3 | export class CompareHelper implements IHtmlEngineHelper {
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| 4 | public helperFunc(
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| 5 | context: any,
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| 6 | a: any,
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| 7 | operator: string,
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| 8 | b: any,
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| 9 | options: IHandlebarsOptions
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| 10 | ): string {
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| 11 | if (arguments.length < 4) {
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| 12 | throw new Error('handlebars Helper {{compare}} expects 4 arguments');
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| 13 | }
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| 14 |
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| 15 | let result;
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| 16 | switch (operator) {
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| 17 | case 'indexof':
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| 18 | result = b.indexOf(a) !== -1;
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| 19 | break;
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| 20 | case '===':
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| 21 | result = a === b;
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| 22 | break;
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| 23 | case '!==':
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| 24 | result = a !== b;
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| 25 | break;
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| 26 | case '>':
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| 27 | result = a > b;
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| 28 | break;
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| 29 | default: {
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| 30 | throw new Error('helper {{compare}}: invalid operator: `' + operator + '`');
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| 31 | }
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| 32 | }
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| 33 |
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| 34 | if (result === false) {
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| 35 | return options.inverse(context);
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| 36 | }
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| 37 | return options.fn(context);
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| 38 | }
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| 39 | }
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