2cc3ac0299
This commit removes the `no-string-literal: false` tslint rule to more closely align `tslint.json` with the one generated by the latest Angular CLI for new apps. PR Close #39018
63 lines
2.1 KiB
TypeScript
63 lines
2.1 KiB
TypeScript
import { Injectable } from '@angular/core';
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import { from, Observable } from 'rxjs';
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import { first, map, share } from 'rxjs/operators';
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import { Logger } from 'app/shared/logger.service';
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type PrettyPrintOne = (code: string, language?: string, linenums?: number | boolean) => string;
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/**
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* Wrapper around the prettify.js library
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*/
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@Injectable()
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export class PrettyPrinter {
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private prettyPrintOne: Observable<PrettyPrintOne>;
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constructor(private logger: Logger) {
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this.prettyPrintOne = from(this.getPrettyPrintOne()).pipe(share());
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}
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private getPrettyPrintOne(): Promise<PrettyPrintOne> {
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const ppo = (window as any).prettyPrintOne;
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return ppo ? Promise.resolve(ppo) :
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// `prettyPrintOne` is not on `window`, which means `prettify.js` has not been loaded yet.
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// Import it; ad a side-effect it will add `prettyPrintOne` on `window`.
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import('assets/js/prettify.js' as any)
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.then(
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() => (window as any).prettyPrintOne,
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err => {
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const msg = `Cannot get prettify.js from server: ${err.message}`;
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this.logger.error(new Error(msg));
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// return a pretty print fn that always fails.
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return () => { throw new Error(msg); };
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});
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}
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/**
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* Format code snippet as HTML
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* @param code - the code snippet to format; should already be HTML encoded
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* @param [language] - The language of the code to render (could be javascript, html, typescript, etc)
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* @param [linenums] - Whether to display line numbers:
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* - false: don't display
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* - true: do display
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* - number: do display but start at the given number
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* @returns Observable<string> - Observable of formatted code
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*/
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formatCode(code: string, language?: string, linenums?: number | boolean) {
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return this.prettyPrintOne.pipe(
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map(ppo => {
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try {
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return ppo(code, language, linenums);
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} catch (err) {
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const msg = `Could not format code that begins '${code.substr(0, 50)}...'.`;
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console.error(msg, err);
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throw new Error(msg);
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}
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}),
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first(), // complete immediately
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);
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}
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}
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