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Copy pathcode.component.ts
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204 lines (176 loc) · 6.75 KB
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import { Component, ElementRef, EventEmitter, Input, OnChanges, Output, ViewChild } from '@angular/core';
import { Clipboard } from '@angular/cdk/clipboard';
import { Logger } from 'app/shared/logger.service';
import { PrettyPrinter } from './pretty-printer.service';
import { MatSnackBar } from '@angular/material/snack-bar';
import { Observable, of } from 'rxjs';
import { tap } from 'rxjs/operators';
import { unwrapHtmlForSink } from 'safevalues';
import { htmlFromStringKnownToSatisfyTypeContract } from 'safevalues/unsafe/reviewed';
import { fromOuterHTML } from 'app/shared/security';
/**
* Formatted Code Block
*
* Pretty renders a code block, used in the docs and API reference by the code-example and
* code-tabs embedded components.
* It includes a "copy" button that will send the content to the clipboard when clicked
*
* Example usage:
*
* ```
* <aio-code
* [language]="ts"
* [linenums]="true"
* [path]="router/src/app/app.module.ts"
* [region]="animations-module">
* </aio-code>
* ```
*
*
* Renders code provided through the `updateCode` method.
*/
@Component({
selector: 'aio-code',
template: `
<pre class="prettyprint lang-{{language}}">
<button *ngIf="!hideCopy" class="material-icons copy-button no-print"
title="Copy code snippet"
[attr.aria-label]="ariaLabel"
(click)="doCopy()">
<span aria-hidden="true">content_copy</span>
</button>
<code class="animated fadeIn" #codeContainer></code>
</pre>
`
})
export class CodeComponent implements OnChanges {
ariaLabel = '';
/** The code to be copied when clicking the copy button, this should not be HTML encoded */
private codeText: string;
/** Code that should be formatted with current inputs and displayed in the view. */
set code(code: TrustedHTML) {
this._code = code;
if (!this._code.toString().trim()) {
this.showMissingCodeMessage();
} else {
this.formatDisplayedCode();
}
}
get code(): TrustedHTML {
return this._code;
}
_code: TrustedHTML;
/** Whether the copy button should be shown. */
@Input() hideCopy: boolean;
/** Language to render the code (e.g. javascript, dart, typescript). */
@Input() language: string | undefined;
/**
* Whether to display line numbers:
* - If false: hide
* - If true: show
* - If number: show but start at that number
*/
@Input() linenums: boolean | number | string | undefined;
/** Path to the source of the code. */
@Input() path: string;
/** Region of the source of the code being displayed. */
@Input() region: string;
/** Optional header to be displayed above the code. */
@Input()
set header(header: string | undefined) {
this._header = header;
this.ariaLabel = this.header ? `Copy code snippet from ${this.header}` : '';
}
get header(): string|undefined { return this._header; }
private _header: string | undefined;
@Output() codeFormatted = new EventEmitter<void>();
/** The element in the template that will display the formatted code. */
@ViewChild('codeContainer', { static: true }) codeContainer: ElementRef;
constructor(
private snackbar: MatSnackBar,
private pretty: PrettyPrinter,
private clipboard: Clipboard,
private logger: Logger) {}
ngOnChanges() {
// If some inputs have changed and there is code displayed, update the view with the latest
// formatted code.
if (this.code) {
this.formatDisplayedCode();
}
}
private formatDisplayedCode() {
const linenums = this.getLinenums();
const leftAlignedCode = leftAlign(this.code);
this.setCodeHtml(leftAlignedCode); // start with unformatted code
this.codeText = this.getCodeText(); // store the unformatted code as text (for copying)
const skipPrettify = of(undefined);
const prettifyCode = this.pretty
.formatCode(leftAlignedCode, this.language, linenums)
.pipe(tap(formattedCode => this.setCodeHtml(formattedCode)));
if (linenums !== false && this.language === 'none') {
this.logger.warn("Using 'linenums' with 'language: none' is currently not supported.");
}
((this.language === 'none' ? skipPrettify : prettifyCode) as Observable<unknown>)
.subscribe({
next: () => this.codeFormatted.emit(),
error: () => { /* ignore failure to format */ },
});
}
/** Sets the message showing that the code could not be found. */
private showMissingCodeMessage() {
const src = this.path ? this.path + (this.region ? '#' + this.region : '') : '';
const msg = `The code sample is missing${src ? ` for\n${src}` : '.'}`;
const el = document.createElement('p');
el.className = 'code-missing';
el.textContent = msg;
this.setCodeHtml(fromOuterHTML(el));
}
/** Sets the innerHTML of the code container to the provided code string. */
private setCodeHtml(formattedCode: TrustedHTML) {
// **Security:** Code example content is provided by docs authors and as such its considered to
// be safe for innerHTML purposes.
this.codeContainer.nativeElement.innerHTML = unwrapHtmlForSink(formattedCode);
}
/** Gets the textContent of the displayed code element. */
private getCodeText() {
// `prettify` may remove newlines, e.g. when `linenums` are on. Retrieve the content of the
// container as text, before prettifying it.
// We take the textContent because we don't want it to be HTML encoded.
return this.codeContainer.nativeElement.textContent;
}
/** Copies the code snippet to the user's clipboard. */
doCopy() {
const code = this.codeText;
const successfullyCopied = this.clipboard.copy(code);
if (successfullyCopied) {
this.logger.log('Copied code to clipboard:', code);
this.snackbar.open('Code Copied', '', { duration: 800 });
} else {
this.logger.error(new Error(`ERROR copying code to clipboard: "${code}"`));
this.snackbar.open('Copy failed. Please try again!', '', { duration: 800 });
}
}
/** Gets the calculated value of linenums (boolean/number). */
getLinenums() {
const linenums =
typeof this.linenums === 'boolean' ? this.linenums :
this.linenums === 'true' ? true :
this.linenums === 'false' ? false :
typeof this.linenums === 'string' ? parseInt(this.linenums, 10) :
this.linenums;
return (linenums != null) && !isNaN(linenums as number) && linenums;
}
}
function leftAlign(text: TrustedHTML): TrustedHTML {
let indent = Number.MAX_VALUE;
const lines = text.toString().split('\n');
lines.forEach(line => {
const lineIndent = line.search(/\S/);
if (lineIndent !== -1) {
indent = Math.min(lineIndent, indent);
}
});
return htmlFromStringKnownToSatisfyTypeContract(
lines.map(line => line.slice(indent)).join('\n').trim(),
'safe manipulation of existing trusted HTML');
}