mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 18:18:51 +03:00
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.
211 lines
6.2 KiB
SQL
211 lines
6.2 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 types.mal_table; -- 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_T;
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cidx integer;
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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 eval_ast(ast integer, env integer) RETURN integer IS
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i integer;
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old_seq mal_vals;
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new_seq mal_vals;
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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_T).val_seq;
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new_seq := mal_vals();
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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_vals());
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old_midx := TREAT(M(ast) AS mal_map_T).map_idx;
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new_midx := TREAT(M(new_hm) AS mal_map_T).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_vals;
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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 mal_func_T;
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args mal_vals;
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BEGIN
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WHILE TRUE LOOP
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-- io.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_T).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_T).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 = '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_T).val_seq;
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IF M(f).type_id = 12 THEN
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malfn := TREAT(M(f) AS mal_func_T);
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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 core.do_core_func(M, H, 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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-- 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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-- 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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-- 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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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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