好的，我查詢到下面代碼可以讀取HTML，請(qǐng)問如何解讀這段代碼？

data temp(keep=table row col value);

infile myfile recfm=f lrecl=&filesize. column=c eof=abc;

length which $8;

no_more_tables = 0;

do while(1);

which = 'TABLE';

table+1;

input @ '

if no_more_tables then leave;

start_table = c;

input @ '

' @;

end_table = c;

input @start_table @;

row=0;

do while(1);

row+1;

which = 'TR';

input @ '

' @;

if c >= end_table then do;

input @end_table @;

leave;

end;

start_row = c;

input @ '

' @;

end_row = c;

input @start_row @;

col=0;

which = 'TD';

do while(1);

col+1;

input @ '

' @;

if c >= end_row then do;

input @end_row @;

leave;

end;

start_col = c;

input @ '

' @;

l = c-6-start_col+1;

input @start_col valuec $varying20. l @;

value=input(valuec,best20.);

output;

end;

end;

end;

return;

abc:;

if which = 'TABLE'

then no_more_tables = 1;

else if which = 'TR'

then input @end_table @;

else if which = 'TD'

then input @end_row @;

return;

run;

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