| 1 | import { EOL } from 'os';
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| 2 |
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| 3 | const DEFAULT_MAX_SIZE = 2048;
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| 4 |
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| 5 | export class StringBuilder {
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| 6 | private currentLength = 0;
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| 7 | private readonly strings: string[] = [];
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| 8 | private readonly maxSize = DEFAULT_MAX_SIZE;
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| 9 |
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| 10 | public append(str: string): void {
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| 11 | this.strings.push(str);
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| 12 | this.currentLength += str.length;
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| 13 | while (this.currentLength > this.maxSize && this.strings.length > 1) {
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| 14 | const shifted = this.strings.shift()!;
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| 15 | this.currentLength -= shifted.length;
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| 16 | }
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| 17 | }
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| 18 |
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| 19 | public toString(): string {
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| 20 | return this.strings.join('');
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| 21 | }
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| 22 |
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| 23 | public static concat(...builders: StringBuilder[]): string {
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| 24 | return builders
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| 25 | .map((b) => b.toString())
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| 26 | .filter(Boolean)
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| 27 | .join(EOL);
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| 28 | }
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| 29 | }
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