private scanRegExpBody()

in src/scanner.ts [1146:1186]
35 lines of code
10 McCabe index (conditional complexity)

    private scanRegExpBody(): string {
        let ch = this.source[this.index];
        assert(ch === '/', 'Regular expression literal must start with a slash');

        let str = this.source[this.index++];
        let classMarker = false;
        let terminated = false;

        while (!this.eof()) {
            ch = this.source[this.index++];
            str += ch;
            if (ch === '\\') {
                ch = this.source[this.index++];
                // https://tc39.github.io/ecma262/#sec-literals-regular-expression-literals
                if (Character.isLineTerminator(ch.charCodeAt(0))) {
                    this.throwUnexpectedToken(Messages.UnterminatedRegExp);
                }
                str += ch;
            } else if (Character.isLineTerminator(ch.charCodeAt(0))) {
                this.throwUnexpectedToken(Messages.UnterminatedRegExp);
            } else if (classMarker) {
                if (ch === ']') {
                    classMarker = false;
                }
            } else {
                if (ch === '/') {
                    terminated = true;
                    break;
                } else if (ch === '[') {
                    classMarker = true;
                }
            }
        }

        if (!terminated) {
            this.throwUnexpectedToken(Messages.UnterminatedRegExp);
        }

        // Exclude leading and trailing slash.
        return str.substr(1, str.length - 2);
    }