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CREATE DATABASE turing; CREATE TABLE program ( in_state INT NOT NULL , sread VARCHAR( 1 ) NOT NULL , actions VARCHAR( 1 ) NOT NULL , out_state INT NOT NULL ) ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_unicode_ci; CREATE TABLE output_string ( output TEXT NOT NULL ) ENGINE = MYISAM ; CREATE TABLE ribbon ( sinput TEXT NOT NULL ) ENGINE = MYISAM ;
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delimiter // CREATE procedure turing(IN sstate INT(11), IN pos INT(11)) BEGIN turing:BEGIN SET @p=pos; SET @sstate=sstate; SELECT @inread:=SUBSTRING(sinput, @p, 1) FROM ribbon; SELECT @instate:=in_state, @sread:=sread, @actions:=actions, @out_state:=out_state, @numrows:=count(in_state) FROM program WHERE in_state = @sstate AND sread = @inread; IF @numrows > 1 THEN UPDATE output_string SET output= 'Confused :('; LEAVE turing; ELSEIF @numrows = 0 THEN UPDATE output_string SET output='Do not understand what to do next :('; LEAVE turing; ELSE SELECT @lin:= LENGTH(sinput) FROM ribbon; SELECT @input:=sinput FROM ribbon; IF @actions = '>' THEN IF @lin = pos THEN SELECT @new_input:=CONCAT(sinput, ' ') FROM ribbon; UPDATE ribbon SET sinput=@new_input; END IF; SET @pos=pos+1; ELSEIF @actions = '<' THEN IF pos>1 THEN SET @pos=pos-1; ELSE UPDATE output_string SET output='Carriage has left the ribbon'; LEAVE turing; END IF; ELSEIF @actions = '
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