mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 18:18:51 +03:00
311 lines
10 KiB
SQL
311 lines
10 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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@env.sql
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@core.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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E env_pkg.env_entry_table; -- mal env memory pool
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repl_env integer;
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x integer;
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line CLOB;
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core_ns core_ns_type;
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cidx integer;
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argv mal_seq_items_type;
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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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-- forward declarations
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FUNCTION EVAL(orig_ast integer, orig_env integer) RETURN integer;
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FUNCTION do_builtin(fn integer, args mal_seq_items_type) RETURN integer;
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FUNCTION is_pair(ast integer) RETURN BOOLEAN IS
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BEGIN
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RETURN M(ast).type_id IN (8,9) AND types.count(M, ast) > 0;
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END;
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FUNCTION quasiquote(ast integer) RETURN integer IS
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a0 integer;
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a00 integer;
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BEGIN
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IF NOT is_pair(ast) THEN
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RETURN types.list(M, types.symbol(M, 'quote'), ast);
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ELSE
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a0 := types.nth(M, ast, 0);
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IF M(a0).type_id = 7 AND
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TREAT(m(a0) AS mal_str_type).val_str = 'unquote' THEN
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RETURN types.nth(M, ast, 1);
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ELSIF is_pair(a0) THEN
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a00 := types.nth(M, a0, 0);
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IF M(a00).type_id = 7 AND
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TREAT(M(a00) AS mal_str_type).val_str = 'splice-unquote' THEN
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RETURN types.list(M, types.symbol(M, 'concat'),
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types.nth(M, a0, 1),
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quasiquote(types.slice(M, ast, 1)));
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END IF;
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END IF;
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RETURN types.list(M, types.symbol(M, 'cons'),
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quasiquote(a0),
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quasiquote(types.slice(M, ast, 1)));
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END IF;
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END;
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FUNCTION eval_ast(ast integer, env integer) RETURN integer IS
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i integer;
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old_seq mal_seq_items_type;
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new_seq mal_seq_items_type;
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new_hm integer;
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old_midx integer;
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new_midx integer;
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k varchar2(256);
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BEGIN
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IF M(ast).type_id = 7 THEN
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RETURN env_pkg.env_get(M, E, env, ast);
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ELSIF M(ast).type_id IN (8,9) THEN
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old_seq := TREAT(M(ast) AS mal_seq_type).val_seq;
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new_seq := mal_seq_items_type();
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new_seq.EXTEND(old_seq.COUNT);
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FOR i IN 1..old_seq.COUNT LOOP
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new_seq(i) := EVAL(old_seq(i), env);
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END LOOP;
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RETURN types.seq(M, M(ast).type_id, new_seq);
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ELSIF M(ast).type_id IN (10) THEN
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new_hm := types.hash_map(M, H, mal_seq_items_type());
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old_midx := TREAT(M(ast) AS mal_map_type).map_idx;
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new_midx := TREAT(M(new_hm) AS mal_map_type).map_idx;
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k := H(old_midx).FIRST();
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WHILE k IS NOT NULL LOOP
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H(new_midx)(k) := EVAL(H(old_midx)(k), env);
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k := H(old_midx).NEXT(k);
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END LOOP;
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RETURN new_hm;
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ELSE
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RETURN ast;
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END IF;
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END;
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FUNCTION EVAL(orig_ast integer, orig_env integer) RETURN integer IS
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ast integer := orig_ast;
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env integer := orig_env;
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el integer;
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a0 integer;
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a0sym varchar2(100);
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seq mal_seq_items_type;
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let_env integer;
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i integer;
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f integer;
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cond integer;
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malfn malfunc_type;
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args mal_seq_items_type;
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BEGIN
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WHILE TRUE LOOP
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-- stream_writeline('EVAL: ' || printer.pr_str(M, ast));
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IF M(ast).type_id <> 8 THEN
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RETURN eval_ast(ast, env);
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END IF;
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IF types.count(M, ast) = 0 THEN
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RETURN ast; -- empty list just returned
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END IF;
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-- apply
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a0 := types.first(M, ast);
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if M(a0).type_id = 7 THEN -- symbol
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a0sym := TREAT(M(a0) AS mal_str_type).val_str;
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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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RETURN env_pkg.env_set(M, E, env,
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types.nth(M, ast, 1), EVAL(types.nth(M, ast, 2), env));
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WHEN a0sym = 'let*' THEN
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let_env := env_pkg.env_new(M, E, env);
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seq := TREAT(M(types.nth(M, ast, 1)) AS mal_seq_type).val_seq;
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i := 1;
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WHILE i <= seq.COUNT LOOP
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x := env_pkg.env_set(M, E, let_env,
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seq(i), EVAL(seq(i+1), let_env));
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i := i + 2;
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END LOOP;
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env := let_env;
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ast := types.nth(M, ast, 2); -- TCO
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WHEN a0sym = 'quote' THEN
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RETURN types.nth(M, ast, 1);
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WHEN a0sym = 'quasiquote' THEN
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RETURN EVAL(quasiquote(types.nth(M, ast, 1)), env);
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WHEN a0sym = 'do' THEN
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x := types.slice(M, ast, 1, types.count(M, ast)-2);
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x := eval_ast(x, env);
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ast := types.nth(M, ast, types.count(M, ast)-1); -- TCO
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WHEN a0sym = 'if' THEN
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cond := EVAL(types.nth(M, ast, 1), env);
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IF cond = 1 OR cond = 2 THEN -- nil or false
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IF types.count(M, ast) > 3 THEN
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ast := types.nth(M, ast, 3); -- TCO
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ELSE
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RETURN 1; -- nil
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END IF;
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ELSE
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ast := types.nth(M, ast, 2); -- TCO
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END IF;
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WHEN a0sym = 'fn*' THEN
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RETURN types.malfunc(M, types.nth(M, ast, 2),
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types.nth(M, ast, 1),
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env);
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ELSE
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el := eval_ast(ast, env);
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f := types.first(M, el);
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args := TREAT(M(types.slice(M, el, 1)) AS mal_seq_type).val_seq;
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IF M(f).type_id = 12 THEN
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malfn := TREAT(M(f) AS malfunc_type);
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env := env_pkg.env_new(M, E, malfn.env,
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malfn.params, args);
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ast := malfn.ast; -- TCO
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ELSE
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RETURN do_builtin(f, args);
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END IF;
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END CASE;
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END LOOP;
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END;
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-- hack to get around lack of function references
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-- functions that require special access to repl_env or EVAL
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-- are implemented directly here, otherwise, core.do_core_fn
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-- is called.
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FUNCTION do_builtin(fn integer, args mal_seq_items_type) RETURN integer IS
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fname varchar2(100);
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val integer;
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f integer;
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malfn malfunc_type;
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fargs mal_seq_items_type;
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fn_env integer;
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BEGIN
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fname := TREAT(M(fn) AS mal_str_type).val_str;
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CASE
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WHEN fname = 'do_eval' THEN
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RETURN EVAL(args(1), repl_env);
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WHEN fname = 'swap!' THEN
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val := TREAT(M(args(1)) AS mal_atom_type).val;
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f := args(2);
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-- slice one extra at the beginning that will be changed
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-- to the value of the atom
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fargs := TREAT(M(types.slice(M, args, 1)) AS mal_seq_type).val_seq;
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fargs(1) := val;
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IF M(f).type_id = 12 THEN
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malfn := TREAT(M(f) AS malfunc_type);
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fn_env := env_pkg.env_new(M, E, malfn.env,
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malfn.params, fargs);
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val := EVAL(malfn.ast, fn_env);
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ELSE
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val := do_builtin(f, fargs);
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END IF;
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M(args(1)) := mal_atom_type(13, val);
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RETURN val;
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ELSE
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RETURN core.do_core_func(M, H, fn, args);
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END CASE;
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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), repl_env));
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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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E := env_pkg.env_entry_table();
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repl_env := env_pkg.env_new(M, E, NULL);
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argv := TREAT(M(reader.read_str(M, H, args)) AS mal_seq_type).val_seq;
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-- core.EXT: defined using PL/SQL
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core_ns := core.get_core_ns();
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FOR cidx IN 1..core_ns.COUNT LOOP
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x := env_pkg.env_set(M, E, repl_env,
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types.symbol(M, core_ns(cidx)),
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types.func(M, core_ns(cidx)));
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END LOOP;
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x := env_pkg.env_set(M, E, repl_env,
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types.symbol(M, 'eval'),
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types.func(M, 'do_eval'));
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x := env_pkg.env_set(M, E, repl_env,
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types.symbol(M, '*ARGV*'),
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types.slice(M, argv, 1));
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-- core.mal: defined using the language itself
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line := REP('(def! not (fn* (a) (if a false true)))');
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line := REP('(def! load-file (fn* (f) (eval (read-string (str "(do " (slurp f) ")")))))');
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IF argv.COUNT() > 0 THEN
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BEGIN
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line := REP('(load-file "' ||
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TREAT(M(argv(1)) AS mal_str_type).val_str ||
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'")');
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io.close(1); -- close output stream
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RETURN 0;
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EXCEPTION WHEN OTHERS THEN
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io.writeline('Error: ' || SQLERRM);
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io.writeline(dbms_utility.format_error_backtrace);
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io.close(1); -- close output stream
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RAISE;
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END;
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END IF;
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WHILE true LOOP
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BEGIN
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line := io.readline('user> ', 0);
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IF line = EMPTY_CLOB() THEN CONTINUE; END IF;
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IF line IS NOT NULL THEN
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io.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 read stream closed
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io.close(1); -- close output stream
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RETURN 0;
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END IF;
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io.writeline('Error: ' || SQLERRM);
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io.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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