mirror of
https://github.com/kanaka/mal.git
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202 lines
5.8 KiB
PL/PgSQL
202 lines
5.8 KiB
PL/PgSQL
\set VERBOSITY 'terse'
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\i init.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 env.sql
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\i core.sql
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-- ---------------------------------------------------------
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-- step1_read_print.sql
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-- read
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CREATE OR REPLACE FUNCTION READ(line varchar) RETURNS integer AS $$
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BEGIN
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RETURN read_str(line);
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END; $$ LANGUAGE plpgsql;
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-- eval
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CREATE OR REPLACE FUNCTION eval_ast(ast integer, env integer) RETURNS integer AS $$
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DECLARE
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type integer;
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symkey varchar;
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vid integer;
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i integer;
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src_coll_id integer;
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dst_coll_id integer = NULL;
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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 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 := env_get(env, ast);
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END;
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WHEN type = 8 OR type = 9 THEN
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BEGIN
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src_coll_id := (SELECT collection_id FROM value WHERE value_id = ast);
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FOR vid, i IN (SELECT value_id, idx FROM collection
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WHERE collection_id = src_coll_id)
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LOOP
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e := EVAL(vid, env);
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IF dst_coll_id IS NULL THEN
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dst_coll_id := COALESCE((SELECT Max(collection_id)
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FROM collection)+1,0);
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END IF;
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-- Evaluated each entry
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INSERT INTO collection (collection_id, idx, value_id)
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VALUES (dst_coll_id, i, e);
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END LOOP;
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-- Create value entry pointing to new collection
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INSERT INTO value (type_id, collection_id)
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VALUES (type, dst_coll_id)
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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 OR REPLACE FUNCTION 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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binds integer[];
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exprs 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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-- RAISE NOTICE 'EVAL: % [%]', pr_str(ast), ast;
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SELECT type_id INTO type FROM value WHERE value_id = ast;
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IF type <> 8 THEN
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RETURN eval_ast(ast, env);
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END IF;
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a0 := _first(ast);
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IF _symbol_Q(a0) THEN
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a0sym := (SELECT string.value FROM string
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INNER JOIN value ON value.val_string_id=string.string_id
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WHERE value.value_id = a0);
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ELSE
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a0sym := '__<*fn*>__';
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END IF;
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--RAISE NOTICE 'ast: %, a0sym: %', ast, a0sym;
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CASE
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WHEN a0sym = 'def!' THEN
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BEGIN
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RETURN env_set(env, _nth(ast, 1), EVAL(_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 := env_new(env);
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a1 := _nth(ast, 1);
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binds := ARRAY(SELECT collection.value_id FROM collection INNER JOIN value
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ON collection.collection_id=value.collection_id
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WHERE value.value_id = a1
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AND (collection.idx % 2) = 0
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ORDER BY collection.idx);
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exprs := ARRAY(SELECT collection.value_id FROM collection INNER JOIN value
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ON collection.collection_id=value.collection_id
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WHERE value.value_id = a1
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AND (collection.idx % 2) = 1
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ORDER BY collection.idx);
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FOR idx IN array_lower(binds, 1) .. array_upper(binds, 1)
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LOOP
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PERFORM env_set(let_env, binds[idx], EVAL(exprs[idx], let_env));
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END LOOP;
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env := let_env;
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ast := _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 eval_ast(_slice(ast, 1, _count(ast)-1), env);
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ast := _nth(ast, _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 := EVAL(_nth(ast, 1), env);
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SELECT type_id INTO type FROM value WHERE value_id = cond;
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IF type = 0 OR type = 1 THEN -- nil or false
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IF _count(ast) > 3 THEN
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ast := _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 := _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 _function(_nth(ast, 2), _nth(ast, 1), env);
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END;
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ELSE
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BEGIN
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el := eval_ast(ast, env);
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SELECT type_id, collection_id, function_name
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INTO type, fn, fname
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FROM value WHERE value_id = _first(el);
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args := _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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SELECT value_id, params_id, env_id
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INTO fast, fparams, fenv
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FROM collection
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WHERE collection_id = fn;
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env := env_new_bindings(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 OR REPLACE FUNCTION PRINT(exp integer) RETURNS varchar AS $$
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BEGIN
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RETURN pr_str(exp);
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END; $$ LANGUAGE plpgsql;
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-- repl
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-- repl_env is environment 0
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CREATE OR REPLACE FUNCTION REP(line varchar) RETURNS varchar AS $$
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BEGIN
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RETURN PRINT(EVAL(READ(line), 0));
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END; $$ 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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-- core.mal: defined using the language itself
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SELECT REP('(def! not (fn* (a) (if a false true)))') \g '/dev/null'
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