mirror of
https://github.com/kanaka/mal.git
synced 2024-09-21 10:37:58 +03:00
72 lines
1.5 KiB
SQL
72 lines
1.5 KiB
SQL
@io.sql
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@types.sql
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@reader.sql
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@printer.sql
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CREATE OR REPLACE PACKAGE mal IS
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FUNCTION MAIN(args varchar DEFAULT '()') RETURN integer;
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END mal;
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/
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CREATE OR REPLACE PACKAGE BODY mal IS
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FUNCTION MAIN(args varchar DEFAULT '()') RETURN integer IS
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M mem_type; -- general mal value memory pool
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H types.map_entry_table; -- hashmap memory pool
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line varchar2(4000);
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-- read
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FUNCTION READ(line varchar) RETURN integer IS
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BEGIN
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RETURN reader.read_str(M, H, line);
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END;
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-- eval
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FUNCTION EVAL(ast integer, env varchar) RETURN integer IS
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BEGIN
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RETURN ast;
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END;
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-- print
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FUNCTION PRINT(exp integer) RETURN varchar IS
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BEGIN
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RETURN printer.pr_str(M, H, exp);
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END;
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-- repl
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FUNCTION REP(line varchar) RETURN varchar IS
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BEGIN
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RETURN PRINT(EVAL(READ(line), ''));
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END;
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BEGIN
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-- initialize memory pools
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M := types.mem_new();
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H := types.map_entry_table();
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WHILE true LOOP
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BEGIN
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line := stream_readline('user> ', 0);
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IF line IS NULL THEN CONTINUE; END IF;
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IF line IS NOT NULL THEN
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stream_writeline(REP(line));
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END IF;
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EXCEPTION WHEN OTHERS THEN
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IF SQLCODE = -20001 THEN -- io streams closed
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RETURN 0;
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END IF;
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stream_writeline('Error: ' || SQLERRM);
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stream_writeline(dbms_utility.format_error_backtrace);
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END;
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END LOOP;
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END;
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END mal;
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/
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show errors;
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quit;
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