⬑
flex笔记
框架
%{
// defs
%}
%%
[regexp] { /* code */ }
...
%%
// c driver code
OPTIONS
%option nodefault noyywrap yylineno
INPUT
- set
yyin - create and use
YY_BUFFER_STATE - redefine
YY_INPUT
STATE
YY_BUFFER_STATE bs
bs->f
bs->filename
yy_switch_to_buffer()
yylineno
define a state:
%x [STATE_NAME]
start a state during lexing:
{ BEGIN [STATE_NAME]; }
\
\<\