diff options
Diffstat (limited to 'innobase/pars/pars0lex.l')
| -rw-r--r-- | innobase/pars/pars0lex.l | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/innobase/pars/pars0lex.l b/innobase/pars/pars0lex.l index 4e2399613cb..811057d48a1 100644 --- a/innobase/pars/pars0lex.l +++ b/innobase/pars/pars0lex.l @@ -114,11 +114,34 @@ ID [a-z_A-Z][a-z_A-Z0-9]* } "'" { +/* Quoted character string literals are handled in an explicit +start state 'quoted'. This state is entered and the buffer for +the scanned string is emptied upon encountering a starting quote. + +In the state 'quoted', only two actions are possible (defined below). */ BEGIN(quoted); stringbuf_len = 0; } -<quoted>[^\']+ string_append(yytext, yyleng); -<quoted>"'"+ { string_append(yytext, yyleng / 2); +<quoted>[^\']+ { + /* Got a sequence of characters other than "'": + append to string buffer */ + string_append(yytext, yyleng); +} +<quoted>"'"+ { + /* Got a sequence of "'" characters: + append half of them to string buffer, + as "''" represents a single "'". + We apply truncating division, + so that "'''" will result in "'". */ + + string_append(yytext, yyleng / 2); + + /* If we got an odd number of quotes, then the + last quote we got is the terminating quote. + At the end of the string, we return to the + initial start state and report the scanned + string literal. */ + if (yyleng % 2) { BEGIN(INITIAL); yylval = sym_tab_add_str_lit( |