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* test cases for raw string literals * raw string literal implementation * match as block string if starting with triple ", and better error message for simple string except for *#"""#* * fix broken test case block string literal cannot be one line * test cases for raw string literals * raw string literal implementation * match as block string if starting with triple ", and better error message for simple string except for *#"""#* * fix broken test case block string literal cannot be one line * removed unused initial value * rename flag to indicate multi-line string and remove comment * use * to get value from std::optional * clean-ups * removed skip_scan flag and directly return in case of a single line string starting with #+\'\'\' * Updated error message: simple string -> single-line string. Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Updated test cases according to changes in error message * Removed counting_hashtag flag. * Implemented ScanHelper class to handle scanning * Fixed explanation of ReadHashTags. * Addressed PR comment. * Clarify that scan_helper holds the source text. * Addressed PR comments. * Updated error messages in test cases. * Added const keyword to return type of GetCurrentStr(). * addressed PR comments. 1. Moved ScanHelper class to lex_scan_helper.h and lex_scan_helper.cpp. 2. Moved ReadHashTags and Process* functions to lex_scan_helper.cpp. Moved YY_USER_ACTION, SIMPLE_TOKEN and ARG_TOKEN to lex_helper.h. Added a wrapper function YyinputWrapper to call static function yyinput in lexer.lpp. 3. Renamed ScanHelper with StringLexHelper. 4. Modified BUILD accordingly. 5. Renamed data members and functions. * Addressed PR comments. 1. Adjusted order to keep ret usage close. 2. Used resize to construct the string to avoid creation of temp string. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Removed the multi_line flag and skip_read field to improve readability. * Copied default parameter value to definition of UnescapeStringLiteral. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Copied default parameter value to definition of ParseBlockStringLiteral. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Prefix CARBON_ to SIMPLE_TOKEN and ARG_TOKEN macros. * Rollback redefinition of arguments. * Updated comment on the flex macro. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Updated wording. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Moved the EOF error out of the loop. * Removed duplicated declaration. * Changed type of `hashtag_num` and `leading_quotes` to int. * Minor fix: string copy. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Added comment on YyinputWrapper. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Garmmar in comment. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> * Added check of eof before readling next char. * Minor updates based on PR comments. * Minor changes to address PR comments. * Used a clearer way to calculate `hashtag_num` and `leading_quotes`. Switched back to indicate muti-line string with a flag. * Directly copy StringRef for compilation error message. * Make str_with_quote const as we don't change it. Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Added TODO for unsupported cases. * Fixed a typo. Co-authored-by: Jon Ross-Perkins <jperkins@google.com> Co-authored-by: josh11b <josh11b@users.noreply.github.com> Co-authored-by: Jon Ross-Perkins <jperkins@google.com>