mirror of
https://github.com/kanaka/mal.git
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8a19f60386
- Reorder README to have implementation list after "learning tool" bullet. - This also moves tests/ and libs/ into impls. It would be preferrable to have these directories at the top level. However, this causes difficulties with the wasm implementations which need pre-open directories and have trouble with paths starting with "../../". So in lieu of that, symlink those directories to the top-level. - Move the run_argv_test.sh script into the tests directory for general hygiene.
250 lines
7.1 KiB
PL/PgSQL
250 lines
7.1 KiB
PL/PgSQL
-- ---------------------------------------------------------
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-- step6_file.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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\i envs.sql
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\i core.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(ast integer, env integer) RETURNS integer AS $$
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DECLARE
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type integer;
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seq integer[];
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eseq integer[];
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hash hstore;
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ehash hstore;
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kv RECORD;
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e integer;
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result integer;
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BEGIN
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SELECT type_id INTO type FROM types.value WHERE value_id = ast;
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CASE
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WHEN type = 7 THEN
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BEGIN
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result := envs.get(env, ast);
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END;
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WHEN type IN (8, 9) THEN
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BEGIN
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SELECT val_seq INTO seq FROM types.value WHERE value_id = ast;
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-- Evaluate each entry creating a new sequence
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FOR i IN 1 .. COALESCE(array_length(seq, 1), 0) LOOP
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eseq[i] := mal.EVAL(seq[i], env);
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END LOOP;
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INSERT INTO types.value (type_id, val_seq) VALUES (type, eseq)
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RETURNING value_id INTO result;
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END;
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WHEN type = 10 THEN
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BEGIN
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SELECT val_hash INTO hash FROM types.value WHERE value_id = ast;
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-- Evaluate each value for every key/value
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FOR kv IN SELECT * FROM each(hash) LOOP
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e := mal.EVAL(CAST(kv.value AS integer), env);
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IF ehash IS NULL THEN
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ehash := hstore(kv.key, CAST(e AS varchar));
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ELSE
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ehash := ehash || hstore(kv.key, CAST(e AS varchar));
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END IF;
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END LOOP;
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INSERT INTO types.value (type_id, val_hash) VALUES (type, ehash)
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RETURNING value_id INTO result;
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END;
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ELSE
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result := ast;
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END CASE;
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RETURN result;
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END; $$ LANGUAGE plpgsql;
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CREATE FUNCTION mal.EVAL(ast integer, env integer) RETURNS integer AS $$
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DECLARE
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type integer;
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a0 integer;
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a0sym varchar;
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a1 integer;
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let_env integer;
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idx integer;
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binds integer[];
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el integer;
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fn integer;
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fname varchar;
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args integer[];
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cond integer;
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fast integer;
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fparams integer;
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fenv integer;
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result integer;
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BEGIN
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LOOP
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-- PERFORM writeline(format('EVAL: %s [%s]', pr_str(ast), ast));
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SELECT type_id INTO type FROM types.value WHERE value_id = ast;
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IF type <> 8 THEN
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RETURN mal.eval_ast(ast, env);
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END IF;
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IF types._count(ast) = 0 THEN
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RETURN ast;
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END IF;
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a0 := types._first(ast);
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IF types._symbol_Q(a0) THEN
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a0sym := (SELECT val_string FROM types.value WHERE value_id = a0);
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ELSE
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a0sym := '__<*fn*>__';
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END IF;
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CASE
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WHEN a0sym = 'def!' THEN
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BEGIN
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RETURN envs.set(env, types._nth(ast, 1),
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mal.EVAL(types._nth(ast, 2), env));
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END;
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WHEN a0sym = 'let*' THEN
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BEGIN
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let_env := envs.new(env);
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a1 := types._nth(ast, 1);
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binds := (SELECT val_seq FROM types.value WHERE value_id = a1);
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idx := 1;
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WHILE idx < array_length(binds, 1) LOOP
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PERFORM envs.set(let_env, binds[idx],
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mal.EVAL(binds[idx+1], let_env));
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idx := idx + 2;
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END LOOP;
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env := let_env;
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ast := types._nth(ast, 2);
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CONTINUE; -- TCO
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END;
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WHEN a0sym = 'do' THEN
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BEGIN
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PERFORM mal.eval_ast(types._slice(ast, 1, types._count(ast)-1), env);
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ast := types._nth(ast, types._count(ast)-1);
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CONTINUE; -- TCO
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END;
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WHEN a0sym = 'if' THEN
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BEGIN
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cond := mal.EVAL(types._nth(ast, 1), env);
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SELECT type_id INTO type FROM types.value WHERE value_id = cond;
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IF type = 0 OR type = 1 THEN -- nil or false
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IF types._count(ast) > 3 THEN
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ast := types._nth(ast, 3);
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CONTINUE; -- TCO
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ELSE
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RETURN 0; -- nil
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END IF;
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ELSE
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ast := types._nth(ast, 2);
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CONTINUE; -- TCO
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END IF;
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END;
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WHEN a0sym = 'fn*' THEN
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BEGIN
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RETURN types._malfunc(types._nth(ast, 2), types._nth(ast, 1), env);
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END;
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ELSE
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BEGIN
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el := mal.eval_ast(ast, env);
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SELECT type_id, val_string, ast_id, params_id, env_id
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INTO type, fname, fast, fparams, fenv
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FROM types.value WHERE value_id = types._first(el);
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args := types._restArray(el);
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IF type = 11 THEN
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EXECUTE format('SELECT %s($1);', fname)
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INTO result USING args;
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RETURN result;
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ELSIF type = 12 THEN
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env := envs.new(fenv, fparams, args);
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ast := fast;
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CONTINUE; -- TCO
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ELSE
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RAISE EXCEPTION 'Invalid function call';
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END IF;
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END;
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END CASE;
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END LOOP;
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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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-- repl_env is environment 0
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CREATE FUNCTION mal.REP(line varchar) RETURNS varchar AS $$
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BEGIN
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RETURN mal.PRINT(mal.EVAL(mal.READ(line), 0));
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END; $$ LANGUAGE plpgsql;
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-- core.sql: defined using SQL (in core.sql)
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-- repl_env is created and populated with core functions in by core.sql
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CREATE FUNCTION mal.mal_eval(args integer[]) RETURNS integer AS $$
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BEGIN
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RETURN mal.EVAL(args[1], 0);
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END; $$ LANGUAGE plpgsql;
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INSERT INTO types.value (type_id, val_string) VALUES (11, 'mal.mal_eval');
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SELECT envs.vset(0, 'eval',
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(SELECT value_id FROM types.value
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WHERE val_string = 'mal.mal_eval')) \g '/dev/null'
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-- *ARGV* values are set by RUN
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SELECT envs.vset(0, '*ARGV*', mal.READ('()')) \g '/dev/null'
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-- core.mal: defined using the language itself
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SELECT mal.REP('(def! not (fn* (a) (if a false true)))') \g '/dev/null'
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SELECT mal.REP('(def! load-file (fn* (f) (eval (read-string (str "(do " (slurp f) "\nnil)")))))') \g '/dev/null'
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CREATE FUNCTION mal.MAIN(pwd varchar, argstring varchar DEFAULT NULL)
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RETURNS integer AS $$
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DECLARE
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line varchar;
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output varchar;
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allargs integer;
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BEGIN
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PERFORM envs.vset(0, '*PWD*', types._stringv(pwd));
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IF argstring IS NOT NULL THEN
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allargs := mal.READ(argstring);
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PERFORM envs.vset(0, '*ARGV*', types._rest(allargs));
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PERFORM mal.REP('(load-file ' ||
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printer.pr_str(types._first(allargs)) || ')');
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PERFORM io.close(1);
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PERFORM io.wait_flushed(1);
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RETURN 0;
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END IF;
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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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