Method scanString

src/parser.js:433–495

()

  }

  scanString() {
    let quote = this.ch;
    this.next(); // Skip initial quote.

    let buffer;
    let marker = this.idx;

    while (this.ch !== quote) {
      if (this.ch === /*\*/0x5C) {
        if (!buffer) {
          buffer = [];
        }

        buffer.push(this.src.slice(marker, this.idx));

        this.next();

        let unescaped;

        if (this.ch === /*u*/0x75) {
          this.next();

          if (this.idx + 4 < this.len) {
            let hex = this.src.slice(this.idx, this.idx + 4);

            if (!/[A-Z0-9]{4}/i.test(hex)) {
              this.err(`Invalid unicode escape [\\u${hex}]`);
            }

            unescaped = parseInt(hex, 16);
            this.idx += 4;
            this.ch = this.src.charCodeAt(this.idx);
          } else {
            this.err();
          }
        } else {
          unescaped = unescape(this.ch);
          this.next();
        }

        buffer.push(fromCharCode(unescaped));
        marker = this.idx;
      } else if (this.ch === /*EOF*/0 || this.idx >= this.len) {
        this.err('Unterminated quote');
      } else {
        this.next();
      }
    }

    let last = this.src.slice(marker, this.idx);
    this.next(); // Skip terminating quote.

    // Compute the unescaped string value.
    let unescaped = last;

    if (buffer !== null && buffer !== undefined) {
      buffer.push(last);
      unescaped = buffer.join('');