Method scanString

Extension/src/Utility/Text/scanner.ts:839–887

()

    }

    private scanString() {
        const quote = this.#ch;
        const quoteLength = 1;
        const closing = String.fromCharCode(this.#ch);
        let escaped = false;
        let crlf = false;
        let isEscaping = false;

        const text = this.scanUntil((ch, chNext, _chNextNext) => {
            if (isEscaping) {
                isEscaping = false;
                return false;
            }

            if (ch === CharacterCodes.backslash) {
                isEscaping = escaped = true;
                return false;
            }

            if (ch === CharacterCodes.carriageReturn) {
                if (chNext === CharacterCodes.lineFeed) {
                    crlf = true;
                }
                return false;
            }

            return ch === quote;
        }, closing, quoteLength);

        // TODO: optimize to single pass over string, easier if we refactor some bookkeeping first.

        // strip quotes
        let value = text.substring(quoteLength, text.length - quoteLength);

        // Normalize CRLF to LF when interpreting value of multi-line string
        // literals. Matches JavaScript behavior and ensures program behavior does
        // not change due to line-ending conversion.
        if (crlf) {
            value = value.replace(/\r\n/g, '\n');
        }

        if (escaped) {
            value = this.unescapeString(value);
        }

        this.text = text;
        this.stringValue = value;
        return this.kind = Kind.StringLiteral;
    }

    private scanCodeFence() {
        // skip to the end of this line first