Method codePointAt

src/scanner.ts:373–385

(i: number)

    }

    private codePointAt(i: number): number {
        let cp = this.source.charCodeAt(i);

        if (cp >= 0xD800 && cp <= 0xDBFF) {
            const second = this.source.charCodeAt(i + 1);
            if (second >= 0xDC00 && second <= 0xDFFF) {
                const first = cp;
                cp = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
            }
        }

        return cp;
    }

    private scanHexEscape(prefix: string): string | null {
        const len = (prefix === 'u') ? 4 : 2;