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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
DestroyRef,
EventEmitter,
Injectable,
Optional,
computed,
inject,
input,
signal,
} from '@angular/core';
import { TextRange } from '../../utils/util.types';
// 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';
/**
*
* @param text
* @param range text range - assumed to be sorted in order of start indices
* @returns
*/
function computeRangeHighlights(
text: string,
range: TextRange[],
): TextHighlightPart[] {
const parts: TextHighlightPart[] = [];
let lastPartEnd = 0;
for (const [start, end] of range) {
if (start - lastPartEnd > 0) {
// store text between the previous part and the current one as unmarked part
parts.push({
text: text.substring(lastPartEnd, start),
});
}
if (end - start > 0) {
parts.push({ text: text.substring(start, end), mark: true });
}
lastPartEnd = end;
}
// store text following after the last part
if (lastPartEnd < text.length) {
parts.push({ text: text.substring(lastPartEnd) });
}
return parts;
}
function computeRegexHighlights(
text: string,
highlight: string,
prefixOnly: boolean,
supportedPatterns: Patterns[],
): TextHighlightPart[] {
const regex = createRegex(highlight, prefixOnly, supportedPatterns);
const ranges: TextRange[] = [];
// 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)
for (const match of text.matchAll(regex)) {
ranges.push([match.index, match.index + match[0].length]);
}
return computeRangeHighlights(text, ranges);
}
/**
* Highlight substrings within a text.
*/
@Component({
selector: 'gc-text-highlight',
templateUrl: './text-highlight.component.html',
styleUrls: ['./text-highlight.component.css'],
standalone: false,
host: {
'[class]': '"gc-text-highlight-variant-" + this.variant()',
},
})
export class TextHighlightComponent {
/**
* The text to display.
*/
public readonly text = input.required<string>();
/**
* Optional substring to highlight within the displayed text.
*/
public readonly highlight = input<string | TextRange[]>();
/**
* If `true`, the highlight is only shown if it's a prefix of the displayed text. Otherwise, all
* occurrences of the highlight are marked.
*/
public readonly prefixOnly = input<boolean>(false);
/**
* List of patterns supported by the highlighting
* - asterisk: `*` in highlight means any number of character
* - question-mark: `?` in highlight means one character
*/
public readonly supportedPatterns = input<Patterns[]>([
'asterisk',
'question-mark',
]);
/**
* Display variant of the marked highlights.
*/
public readonly variant = input<'default' | 'inverted' | 'reduced'>(
'default',
);
/** @ignore */
protected readonly highlightParts = computed<TextHighlightPart[]>(() =>
this.calculateHighlightParts(),
);
/** @ignore */
private readonly serviceHighlight = signal<string | undefined>(undefined);
constructor(@Optional() private service: TextHighlightService | null) {
if (service) {
// https://v19.angular.dev/api/core/rxjs-interop/toSignal is in dev-preview
const subscription = service.highlightStringChange.subscribe(val => {
this.serviceHighlight.set(val);
});
this.serviceHighlight.set(service.highlightString);
inject(DestroyRef).onDestroy(() => {
subscription.unsubscribe();
});
}
}
/** @ignore */
public _partTrackBy(index: number, part: TextHighlightPart): string {
return `${index.toString()}_${part.mark ? 't' : 'f'}_${part.text}`;
}
/** @ignore */
private calculateHighlightParts(): TextHighlightPart[] {
const highlight = this.highlight() ?? this.serviceHighlight();
const text = this.text();
if (!text) {
return [];
} else if (!highlight) {
return [{ text }];
} else if (Array.isArray(highlight)) {
const sortedRanges = [...highlight];
sortedRanges.sort((a, b) => a[0] - b[0]);
return computeRangeHighlights(text, sortedRanges);
} else {
return computeRegexHighlights(
text,
highlight,
this.prefixOnly(),
this.supportedPatterns(),
);
}
}
}
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