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494792abe4
- move each file to a schema namespace. Don't recreate DB, just the schemas. This is much faster and avoids the error about user still using the DB when recreating the DB. - combine RUN and MAIN_LOOP into MAIN routine. - add open column to streams table - close stream 1 in MAIN
63 lines
1.4 KiB
PL/PgSQL
63 lines
1.4 KiB
PL/PgSQL
-- ---------------------------------------------------------
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-- step1_read_print.sql
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\i init.sql
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\i io.sql
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\i types.sql
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\i reader.sql
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\i printer.sql
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-- ---------------------------------------------------------
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CREATE SCHEMA mal;
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-- read
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CREATE FUNCTION mal.READ(line varchar) RETURNS integer AS $$
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BEGIN
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RETURN reader.read_str(line);
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END; $$ LANGUAGE plpgsql;
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-- eval
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CREATE FUNCTION mal.EVAL(ast integer, env varchar) RETURNS integer AS $$
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BEGIN
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RETURN ast;
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END; $$ LANGUAGE plpgsql;
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-- print
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CREATE FUNCTION mal.PRINT(exp integer) RETURNS varchar AS $$
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BEGIN
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RETURN printer.pr_str(exp);
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END; $$ LANGUAGE plpgsql;
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-- repl
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CREATE FUNCTION mal.REP(line varchar) RETURNS varchar AS $$
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BEGIN
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RETURN mal.PRINT(mal.EVAL(mal.READ(line), ''));
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END; $$ LANGUAGE plpgsql;
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CREATE FUNCTION mal.MAIN(pwd varchar) RETURNS integer AS $$
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DECLARE
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line varchar;
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output varchar;
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BEGIN
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WHILE true
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LOOP
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BEGIN
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line := io.readline('user> ', 0);
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IF line IS NULL THEN
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PERFORM io.close(1);
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RETURN 0;
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END IF;
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IF line NOT IN ('', E'\n') THEN
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output := mal.REP(line);
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PERFORM io.writeline(output);
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END IF;
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EXCEPTION WHEN OTHERS THEN
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PERFORM io.writeline('Error: ' || SQLERRM);
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END;
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END LOOP;
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END; $$ LANGUAGE plpgsql;
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