[求助] 请大家看看这个错误什么意思

我的程序：

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

entity shmxsh is

port( data:out std_logic_vector(6 downto 0);

   rst,clk:in  std_logic

);

end shmxsh;

architecture behav of shmxsh is

begin

process(rst,clk,data)

variable Q:std_logic_vector(2 downto 0);

begin

if 

rst='0' then Q:=(others=>'0');

elsif

 clk'event and clk='1' then

if

 Q<7 then Q:=Q+1;

else

 Q:=(others=>'0');

end if;

end if;

case Q is

when "000"=> data<='0111111';

when "001"=> data<='0000110';

when "010"=> data<='1011011';

when "011"=> data<='1001111';

when "100"=> data<='1100110';

when "101"=> data<='1101101';

when "110"=> data<='1111101';

when "111"=> data<='0000111';

when others=>null;

end case;

end process;

end architecture behav;

-----------------------------------------------------------------------------

messages：

Info: *******************************************************************

Info: Running Quartus II Analysis & Synthesis

Info: Version 7.2 Build 151 09/26/2007 SJ Full Version

Info: Processing started: Fri Apr 27 18:34:56 2012

Info: Command: quartus_map --read_settings_files=on --write_settings_files=off shmxsh -c shmxsh

Error (10500): VHDL syntax error at shmxsh.vhd(25) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(26) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(27) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(28) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(29) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(30) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(31) near text "'";  expecting "(", or an identifier, or  unary operator

Error (10500): VHDL syntax error at shmxsh.vhd(32) near text "'";  expecting "(", or an identifier, or  unary operator

Info: Found 0 design units, including 0 entities, in source file shmxsh.vhd

Error: Quartus II Analysis & Synthesis was unsuccessful. 8 errors, 0 warnings

Info: Allocated 182 megabytes of memory during processing

Error: Processing ended: Fri Apr 27 18:34:58 2012

Error: Elapsed time: 00:00:02

Error: Quartus II Full Compilation was unsuccessful. 8 errors, 0 warnings

）:'(