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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterContentInit,
Component,
EventEmitter,
HostBinding,
Injectable,
Input,
OnChanges,
OnDestroy,
Optional,
SimpleChanges,
} from '@angular/core';
import { Subscription } from 'rxjs';
// Defined in MDN - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#escaping
function escapeRegExp(expression: string) {
return expression.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
function createRegex(
search: string,
prefixOnly: boolean,
patterns: Patterns[],
): RegExp {
const out = escapeRegExp(search);
let regex = prefixOnly ? '^' + out : out;
for (const pattern of patterns) {
regex = escapePattern(regex, pattern);
}
return new RegExp(regex, 'gi');
}
function escapePattern(regex: string, pattern: Patterns) {
if (pattern === 'asterisk') {
return regex.replaceAll('\\*', '.*');
} else {
return regex.replaceAll('\\?', '.');
}
}
@Injectable()
export class TextHighlightService {
public set highlightString(val: string | undefined) {
this._highlightString = val;
this.highlightStringChange.emit(val);
}
public get highlightString(): string | undefined {
return this._highlightString;
}
public readonly highlightStringChange: EventEmitter<string | undefined> =
new EventEmitter<string | undefined>();
private _highlightString?: string;
}
interface TextHighlightPart {
text: string;
mark?: boolean;
}
export type Patterns = 'asterisk' | 'question-mark';
/**
* Highlight substrings within a text.
*/
@Component({
selector: 'gc-text-highlight',
templateUrl: './text-highlight.component.html',
styleUrls: ['./text-highlight.component.css'],
standalone: false,
})
export class TextHighlightComponent
implements AfterContentInit, OnChanges, OnDestroy
{
/**
* The text to display.
*/
@Input()
public text?: string;
/**
* Optional substring to highlight within the displayed text.
*/
@Input()
public highlight?: string;
/**
* If `true`, the highlight is only shown if it's a prefix of the displayed text. Otherwise, all
* occurrences of the highlight are marked.
*/
@Input()
public prefixOnly = false;
/**
* List of patterns supported by the highlighting
* - asterisk: `*` in highlight means any number of character
* - question-mark: `?` in highlight means one character
*/
@Input()
public supportedPatterns: Patterns[] = ['asterisk', 'question-mark'];
/**
* Display variant of the marked highlights.
*/
@Input()
public variant: 'default' | 'inverted' | 'reduced' = 'default';
/** @ignore */
@HostBinding('class')
private get cssClass(): string {
return `gc-text-highlight-variant-${this.variant}`;
}
/** @ignore */
public _highlightParts: TextHighlightPart[] = [];
/** @ignore */
private readonly highlightStringChangeSubscription?: Subscription;
constructor(@Optional() private service: TextHighlightService | null) {
service?.highlightStringChange.subscribe(val => {
this.highlight = val;
this.calculateHighlightParts(); // direct setting does not trigger Angular change detection, update thus invoked manually
});
}
/** @ignore */
public ngOnDestroy(): void {
this.highlightStringChangeSubscription?.unsubscribe();
}
/** @ignore */
public ngAfterContentInit(): void {
if (this.service) {
this.highlight = this.service.highlightString;
this.calculateHighlightParts();
}
}
/** @ignore */
public ngOnChanges(changes: SimpleChanges): void {
if (
'text' in changes ||
'highlight' in changes ||
'prefixOnly' in changes
) {
this.calculateHighlightParts();
}
}
/** @ignore */
public _partTrackBy(index: number, part: TextHighlightPart): string {
return `${index.toString()}_${part.mark ? 't' : 'f'}_${part.text}`;
}
/** @ignore */
private calculateHighlightParts(): void {
if (!this.text) {
this._highlightParts = [];
} else if (!this.highlight) {
this._highlightParts = [{ text: this.text }];
} else {
const regex = createRegex(
this.highlight,
this.prefixOnly,
this.supportedPatterns,
);
const parts: TextHighlightPart[] = [];
// using String.matchAll instead of RegExp.exec, as looping over exec gets stuck at the end when using the regex ".*"
// matchAll doesn't have this problem as it returns an iterator and can be used as direct replacement otherwise
// see also:
// - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec#finding_successive_matches ("pitfalls [...] match zero-length characters")
// - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll#regexp.prototype.exec_and_matchall)
let lastMatchEnd = 0;
for (const match of this.text.matchAll(regex)) {
if (match.index - lastMatchEnd > 0) {
// store text between the previous match and the current one as unmarked part
parts.push({ text: this.text.substring(lastMatchEnd, match.index) });
}
if (match[0].length > 0) {
parts.push({ text: match[0], mark: true });
}
lastMatchEnd = match.index + match[0].length;
}
// store text following after the last match
if (lastMatchEnd < this.text.length) {
parts.push({ text: this.text.substring(lastMatchEnd) });
}
this._highlightParts = parts;
}
}
}
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