Wen Yi <chux...@outlook.com> writes:
> I am a beginner who are interested in database,when I do my study on the lex
> and yacc,I write a example.l like this:
> %%
> .\|n ECHO
> %%
> and then I generate a lex.yy.c use lex
> but when I compile this file,something wrong happend:
> [beginnerc@bogon temp]$ flex '/home/beginnerc/work/temp/example.l'
> [beginnerc@bogon temp]$ cc lex.yy.c -o first -ll
> /home/beginnerc/work/temp/example.l: In function ¡®yylex¡¯:
> lex.yy.c:619:28: error: expected ¡®;¡¯ before ¡®break¡¯
I'm too lazy to actually go and read the flex manual right now,
but that error message suggests strongly that you need a semicolon:
.\|n ECHO;
This'd make sense since the action is supposed to be a C statement.
The universal style in Postgres' flex files is to write braces
around each action:
.\|n { ECHO; }
but I'm not sure that that's actually required, if your action is
only one C statement. I suspect it's just making the action into
a valid C compound block.
regards, tom lane
