! @brief scan a string literal This function scans a string according to Sect. 7 of RFC 8259. While scanning, bytes are escaped and copied into buffer token_buffer. Then the function returns successfully, token_buffer is *not* null-terminated (as it may contain \0 bytes), and token_buffer.size() is the number of bytes in the string. @return token_type::value_string if
| 7557 | description. |
| 7558 | */ |
| 7559 | token_type scan_string() |
| 7560 | { |
| 7561 | // reset token_buffer (ignore opening quote) |
| 7562 | reset(); |
| 7563 | |
| 7564 | // we entered the function by reading an open quote |
| 7565 | JSON_ASSERT(current == '\"'); |
| 7566 | |
| 7567 | while (true) |
| 7568 | { |
| 7569 | // get next character |
| 7570 | switch (get()) |
| 7571 | { |
| 7572 | // end of file while parsing string |
| 7573 | case std::char_traits<char_type>::eof(): |
| 7574 | { |
| 7575 | error_message = "invalid string: missing closing quote"; |
| 7576 | return token_type::parse_error; |
| 7577 | } |
| 7578 | |
| 7579 | // closing quote |
| 7580 | case '\"': |
| 7581 | { |
| 7582 | return token_type::value_string; |
| 7583 | } |
| 7584 | |
| 7585 | // escapes |
| 7586 | case '\\': |
| 7587 | { |
| 7588 | switch (get()) |
| 7589 | { |
| 7590 | // quotation mark |
| 7591 | case '\"': |
| 7592 | add('\"'); |
| 7593 | break; |
| 7594 | // reverse solidus |
| 7595 | case '\\': |
| 7596 | add('\\'); |
| 7597 | break; |
| 7598 | // solidus |
| 7599 | case '/': |
| 7600 | add('/'); |
| 7601 | break; |
| 7602 | // backspace |
| 7603 | case 'b': |
| 7604 | add('\b'); |
| 7605 | break; |
| 7606 | // form feed |
| 7607 | case 'f': |
| 7608 | add('\f'); |
| 7609 | break; |
| 7610 | // line feed |
| 7611 | case 'n': |
| 7612 | add('\n'); |
| 7613 | break; |
| 7614 | // carriage return |
| 7615 | case 'r': |
| 7616 | add('\r'); |