52 lines
2 KiB
TypeScript
52 lines
2 KiB
TypeScript
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import { Component, Input, Inject, OnChanges, SimpleChanges } from 'ng-metadata/core';
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import { Converter, ConverterOptions } from 'showdown';
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import 'showdown-highlightjs-extension';
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import 'highlightjs/styles/vs.css';
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import './markdown-view.component.css';
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/**
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* Renders Markdown content to HTML.
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*/
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@Component({
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selector: 'markdown-view',
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templateUrl: '/static/js/directives/ui/markdown/markdown-view.component.html'
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})
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export class MarkdownViewComponent implements OnChanges {
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@Input('<') public content: string;
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@Input('<') public firstLineOnly: boolean = false;
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@Input('<') public placeholderNeeded: boolean = false;
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private convertedHTML: string = '';
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private readonly placeholder: string = `<p style="visibility:hidden">placeholder</p>`;
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private readonly markdownChars: string[] = ['#', '-', '>', '`'];
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private markdownConverter: Converter;
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constructor(@Inject('markdownConverterFactory') private makeConverter: (options?: ConverterOptions) => Converter,
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@Inject('$sce') private $sce: ng.ISCEService,
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@Inject('$sanitize') private $sanitize: ng.sanitize.ISanitizeService) {
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this.markdownConverter = makeConverter({extensions: ['highlightjs']});
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}
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public ngOnChanges(changes: SimpleChanges): void {
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if (changes['content']) {
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if (!changes['content'].currentValue && this.placeholderNeeded) {
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this.convertedHTML = this.$sce.trustAsHtml(this.placeholder);
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} else if (this.firstLineOnly) {
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const firstLine: string = changes['content'].currentValue.split('\n')
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// Skip code lines
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.filter(line => line.indexOf(' ') != 0)
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// Skip empty lines
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.filter(line => line.trim().length != 0)
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// Skip control lines
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.filter(line => this.markdownChars.indexOf(line.trim()[0]) == -1)[0];
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this.convertedHTML = this.$sanitize(this.markdownConverter.makeHtml(firstLine));
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} else {
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this.convertedHTML = this.$sanitize(this.markdownConverter.makeHtml(changes['content'].currentValue));
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}
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}
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}
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}
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