Code cleanup

- Add parameter and return types
- Add missing @throws tags
- Add visibilities to consts

15 files changed, 96 insertions, 95 deletions

diff --git a/src/ste/ASTNode.php b/src/ste/ASTNode.php
index 3e74635..4eb0348 100644
--- a/src/ste/ASTNode.php
+++ b/src/ste/ASTNode.php
@@ -14,7 +14,7 @@ abstract class ASTNode
      * @param string $tpl
      * @param int $off
      */
-    public function __construct($tpl, $off)
+    public function __construct(string $tpl, int $off)
     {
         $this->tpl    = $tpl;
         $this->offset = $off;
diff --git a/src/ste/Calc.php b/src/ste/Calc.php
index 9030c08..660943d 100644
--- a/src/ste/Calc.php
+++ b/src/ste/Calc.php
@@ -20,7 +20,7 @@ class Calc
      * @return array
      * @throws RuntimeError
      */
-    private static function shunting_yard($infix_math)
+    private static function shunting_yard(string $infix_math): array
     {
         $operators = [
             "+" => ["l", 2],
@@ -112,7 +112,7 @@ class Calc
      * @return array
      * @throws RuntimeError
      */
-    private static function pop2(&$array)
+    private static function pop2(array &$array): array
     {
         $rv = [array_pop($array), array_pop($array)];
         if (array_search(null, $rv, true) !== false) {
@@ -126,7 +126,7 @@ class Calc
      * @return int|float
      * @throws RuntimeError
      */
-    private static function calc_rpn($rpn)
+    private static function calc_rpn(array $rpn)
     {
         $stack = [];
         foreach ($rpn as $token) {
@@ -174,7 +174,7 @@ class Calc
      * @return float|int
      * @throws RuntimeError
      */
-    public static function calc($expr)
+    public static function calc(string $expr)
     {
         return self::calc_rpn(self::shunting_yard($expr));
     }
diff --git a/src/ste/FilesystemStorageAccess.php b/src/ste/FilesystemStorageAccess.php
index cb2fe7f..ead2757 100644
--- a/src/ste/FilesystemStorageAccess.php
+++ b/src/ste/FilesystemStorageAccess.php
@@ -17,13 +17,13 @@ class FilesystemStorageAccess implements StorageAccess
      * @param string $src - The directory with the sources (Writing permissions are not mandatory, because STE does not save template sources).
      * @param string $transc - The directory with the compiled templates (the PHP instance / the HTTP Server needs writing permissions to this directory).
      */
-    public function __construct($src, $transc)
+    public function __construct(string $src, string $transc)
     {
         $this->sourcedir        = $src;
         $this->transcompileddir = $transc;
     }
 
-    public function load($tpl, &$mode)
+    public function load(string $tpl, string &$mode)
     {
         $src_fn    = $this->sourcedir        . "/" . $tpl;
         $transc_fn = $this->transcompileddir . "/" . $tpl . ".php";
@@ -64,7 +64,7 @@ class FilesystemStorageAccess implements StorageAccess
         }
     }
 
-    public function save($tpl, $data, $mode)
+    public function save(string $tpl, string $data, $mode): void
     {
         $fn = (($mode == StorageAccess::MODE_SOURCE) ? $this->sourcedir : $this->transcompileddir) . "/" . $tpl . (($mode == StorageAccess::MODE_TRANSCOMPILED) ? ".php" : "");
         @mkdir(dirname($fn), 0777, true);
diff --git a/src/ste/Misc.php b/src/ste/Misc.php
index 330b3d2..7118b28 100644
--- a/src/ste/Misc.php
+++ b/src/ste/Misc.php
@@ -8,7 +8,7 @@ class Misc
      * @param string $text
      * @return string
      */
-    public static function escape_text($text)
+    public static function escape_text(string $text): string
     {
         return addcslashes($text, "\r\n\t\$\0..\x1f\\\"\x7f..\xff");
     }
diff --git a/src/ste/ParseCompileError.php b/src/ste/ParseCompileError.php
index 0d5a240..bc0c252 100644
--- a/src/ste/ParseCompileError.php
+++ b/src/ste/ParseCompileError.php
@@ -24,7 +24,7 @@ class ParseCompileError extends \Exception
      * Update the message to include a human readable offset.
      * @param string $code
      */
-    public function rewrite($code)
+    public function rewrite(string $code): void
     {
         $line = substr_count(str_replace("\r\n", "\n", substr($code, 0, $this->off)), "\n") + 1;
         $this->message = "{$this->msg} (Template {$this->tpl}, Line $line)";
diff --git a/src/ste/Parser.php b/src/ste/Parser.php
index 399ed75..a588203 100644
--- a/src/ste/Parser.php
+++ b/src/ste/Parser.php
@@ -22,16 +22,16 @@ class Parser
     /** @var int */
     private $len;
 
-    const PARSE_SHORT = 1;
-    const PARSE_TAG   = 2;
+    private const PARSE_SHORT = 1;
+    private const PARSE_TAG   = 2;
 
-    const ESCAPES_DEFAULT = '$?~{}|\\';
+    private const ESCAPES_DEFAULT = '$?~{}|\\';
 
     /**
      * @param string $text
      * @param string $name
      */
-    private function __construct($text, $name)
+    private function __construct(string $text, string $name)
     {
         $this->text = $text;
         $this->name = $name;
@@ -43,7 +43,7 @@ class Parser
      * @param int $n
      * @return string
      */
-    private function peek($n = 1)
+    private function peek(int $n = 1): string
     {
         if ($n <= 0) {
             throw new \InvalidArgumentException("\$n must be > 0");
@@ -55,7 +55,7 @@ class Parser
      * @param int $n
      * @return string
      */
-    private function next($n = 1)
+    private function next(int $n = 1): string
     {
         $c = $this->peek($n);
         $this->off = min($this->off + $n, $this->len);
@@ -65,7 +65,7 @@ class Parser
     /**
      * @return bool
      */
-    private function eof()
+    private function eof(): bool
     {
         return ($this->off == $this->len);
     }
@@ -73,7 +73,7 @@ class Parser
     /**
      * @param int $n
      */
-    private function back($n = 1)
+    private function back(int $n = 1): void
     {
         if ($n <= 0) {
             throw new \InvalidArgumentException("\$n must be > 0");
@@ -85,7 +85,7 @@ class Parser
      * @param string $needle
      * @return false|int
      */
-    private function search_off($needle)
+    private function search_off(string $needle)
     {
         return mb_strpos($this->text, $needle, $this->off);
     }
@@ -94,7 +94,7 @@ class Parser
      * @param string[] $needles
      * @return array 4-tuple of found key, offset, text preceding offset, old offset
      */
-    private function search_multi($needles)
+    private function search_multi(array $needles): array
     {
         $oldoff = $this->off;
 
@@ -121,7 +121,7 @@ class Parser
      * @param string $needle
      * @return array 3-tuple of offset (or false), text preceding offset, old offset
      */
-    private function search($needle)
+    private function search(string $needle): array
     {
         $oldoff = $this->off;
 
@@ -139,7 +139,7 @@ class Parser
      * @param callable $cb
      * @return string
      */
-    private function take_while(callable $cb)
+    private function take_while(callable $cb): string
     {
         $s = "";
         while (($c = $this->next()) !== "") {
@@ -152,7 +152,7 @@ class Parser
         return $s;
     }
 
-    private function skip_ws()
+    private function skip_ws(): void
     {
         $this->take_while("ctype_space");
     }
@@ -161,7 +161,7 @@ class Parser
      * @return string
      * @throws ParseCompileError
      */
-    private function get_name()
+    private function get_name(): string
     {
         $off = $this->off;
         $name = $this->take_while(function ($c) {
@@ -184,7 +184,7 @@ class Parser
      * @return ASTNode[]
      * @throws ParseCompileError
      */
-    public static function parse($text, $name)
+    public static function parse(string $text, string $name): array
     {
         $obj = new self($text, $name);
         $res = $obj->parse_text(
@@ -198,7 +198,7 @@ class Parser
      * @param ASTNode[] $ast
      * @return ASTNode[]
      */
-    private static function combine_consecutive_text(array $ast)
+    private static function combine_consecutive_text(array $ast): array
     {
         $out = [];
 
@@ -239,7 +239,7 @@ class Parser
      * @param ASTNode[] $ast
      * @return ASTNode[]
      */
-    private static function tidyup_ast(array $ast)
+    private static function tidyup_ast(array $ast): array
     {
         foreach ($ast as $node) {
             if ($node instanceof TagNode) {
@@ -266,7 +266,7 @@ class Parser
      * @return ASTNode[][]
      * @throws ParseCompileError
      */
-    private function parse_text($escapes, $flags, $breakon = null, $separator = null, $nullaction = null, $opentag = null, $openedat = -1)
+    private function parse_text(string $escapes, int $flags, $breakon = null, $separator = null, $nullaction = null, $opentag = null, $openedat = -1): array
     {
         $elems = [];
         $astlist = [];
@@ -418,7 +418,7 @@ class Parser
      * @return ASTNode[][]
      * @throws ParseCompileError
      */
-    private function parse_short($shortname, $openedat)
+    private function parse_short(string $shortname, int $openedat): array
     {
         $tplname = $this->name;
 
@@ -441,7 +441,7 @@ class Parser
      * @return VariableNode
      * @throws ParseCompileError
      */
-    private function parse_var($openedat, $curly)
+    private function parse_var(int $openedat, bool $curly): VariableNode
     {
         $varnode = new VariableNode($this->name, $openedat);
         $varnode->name = $this->get_name();
@@ -491,7 +491,7 @@ class Parser
      * @return TagNode
      * @throws ParseCompileError
      */
-    private function parse_tag($openedat)
+    private function parse_tag(int $openedat)
     {
         $tplname = $this->name;
 
diff --git a/src/ste/STECore.php b/src/ste/STECore.php
index 9274587..897a77f 100644
--- a/src/ste/STECore.php
+++ b/src/ste/STECore.php
@@ -90,7 +90,7 @@ class STECore
      *
      * @throws Exception If the tag could not be registered (if $callback is not callable or if $name is empty)
      */
-    public function register_tag($name, $callback)
+    public function register_tag(string $name, callable $callback): void
     {
         if (!is_callable($callback)) {
             throw new Exception("Can not register tag \"$name\", not callable.");
@@ -113,7 +113,7 @@ class STECore
      * @return string The output of the tag or, if a {@see RuntimeError} was thrown, the appropriate result
      *                (see {@see STECore::$mute_runtime_errors}).
      */
-    public function call_tag($name, $params, $sub)
+    public function call_tag(string $name, array $params, callable $sub): string
     {
         try {
             if (!isset($this->tags[$name])) {
@@ -140,7 +140,7 @@ class STECore
      * @return float|int
      * @throws RuntimeError
      */
-    public function calc($expression)
+    public function calc(string $expression)
     {
         return Calc::calc($expression);
     }
@@ -153,6 +153,7 @@ class STECore
      * @param string $tpl The name of the template to execute.
      *
      * @throws CantLoadTemplate If the template could not be loaded.
+     * @throws CantSaveTemplate If the template could not be saved (after compilation).
      * @throws ParseCompileError If the template could not be parsed or compiled.
      * @throws FatalRuntimeError If a tag threw it or if a tag was not found and <$fatal_error_on_missing_tag> is true.
      *
@@ -161,7 +162,7 @@ class STECore
      *
      * @return string The output of the template.
      */
-    public function exectemplate($tpl)
+    public function exectemplate(string $tpl): string
     {
         $output = "";
         $lastblock = $this->load($tpl);
@@ -183,7 +184,7 @@ class STECore
      * @throws RuntimeError If the variable name can not be parsed (e.g. unbalanced brackets).
      * @return mixed A Reference to the variable.
      */
-    public function &get_var_reference($name, $create_if_not_exist)
+    public function &get_var_reference(string $name, bool $create_if_not_exist)
     {
         $ref = &$this->scope->get_var_reference($name, $create_if_not_exist);
         return $ref;
@@ -198,7 +199,7 @@ class STECore
      *
      * @throws RuntimeError If the variable name can not be parsed (e.g. unbalanced brackets).
      */
-    public function set_var_by_name($name, $val)
+    public function set_var_by_name(string $name, $val): void
     {
         $this->scope->set_var_by_name($name, $val);
     }
@@ -212,7 +213,7 @@ class STECore
      *
      * @throws RuntimeError If the variable name can not be parsed (e.g. unbalanced brackets).
      */
-    public function set_local_var($name, $val)
+    public function set_local_var(string $name, $val): void
     {
         $this->scope->set_local_var($name, $val);
     }
@@ -223,10 +224,10 @@ class STECore
      *
      * @param string $name The variables name.
      *
-     * @throws RuntimeError If the variable name can not be parsed (e.g. unbalanced brackets).
      * @return mixed The variables value
+     * @throws RuntimeError If the variable name can not be parsed (e.g. unbalanced brackets).
      */
-    public function get_var_by_name($name)
+    public function get_var_by_name(string $name)
     {
         return $this->scope->get_var_by_name($name);
     }
@@ -247,7 +248,7 @@ class STECore
      *
      * @return string|null The result of the template (if $quiet == false).
      */
-    public function load($tpl, $quiet = false)
+    public function load(string $tpl, bool $quiet = false): ?string
     {
         $tpldir_b4 = $this->cur_tpl_dir;
 
@@ -303,14 +304,14 @@ class STECore
         }
     }
 
-    /*
+    /**
      * Test, if a text represents false (an empty / only whitespace text) or true (everything else).
      *
      * @param string $txt The text to test.
      *
      * @return bool
      */
-    public function evalbool($txt)
+    public function evalbool(string $txt): bool
     {
         return trim(@(string)$txt) != "";
     }
@@ -321,7 +322,7 @@ class STECore
      * @param callable $fx
      * @return \Closure
      */
-    public function make_closure($fx)
+    public function make_closure(callable $fx): \Closure
     {
         $bound_scope = $this->scope;
         return function () use ($bound_scope, $fx) {
diff --git a/src/ste/STEStandardLibrary.php b/src/ste/STEStandardLibrary.php
index 7191718..cd23fdf 100644
--- a/src/ste/STEStandardLibrary.php
+++ b/src/ste/STEStandardLibrary.php
@@ -4,7 +4,7 @@ namespace kch42\ste;
 
 class STEStandardLibrary
 {
-    public static function _register_lib($ste)
+    public static function _register_lib(STECore $ste): void
     {
         foreach (get_class_methods(__CLASS__) as $method) {
             if ($method[0] != "_") {
@@ -19,7 +19,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @return string
      */
-    public static function escape($ste, $params, $sub)
+    public static function escape(STECore $ste, array $params, callable $sub)
     {
         if ($ste->evalbool(@$params["lines"])) {
             return nl2br(htmlspecialchars(str_replace("\r\n", "\n", $sub($ste))));
@@ -34,7 +34,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @return string
      */
-    public static function strlen($ste, $params, $sub)
+    public static function strlen(STECore $ste, array $params, callable $sub)
     {
         return strlen($sub($ste));
     }
@@ -46,7 +46,7 @@ class STEStandardLibrary
      * @return string
      * @throws RuntimeError
      */
-    public static function arraylen($ste, $params, $sub)
+    public static function arraylen(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["array"])) {
             throw new RuntimeError("Missing array parameter in <ste:arraylen>.");
@@ -61,7 +61,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @throws RuntimeError
      */
-    public static function inc($ste, $params, $sub)
+    public static function inc(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["var"])) {
             throw new RuntimeError("Missing var parameter in <ste:inc>.");
@@ -76,7 +76,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @throws RuntimeError
      */
-    public static function dec($ste, $params, $sub)
+    public static function dec(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["var"])) {
             throw new RuntimeError("Missing var parameter in <ste:dec>.");
@@ -91,7 +91,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @return string
      */
-    public static function date($ste, $params, $sub)
+    public static function date(STECore $ste, array $params, callable $sub)
     {
         return @strftime($sub($ste), empty($params["timestamp"]) ? @time() : (int) $params["timestamp"]);
     }
@@ -103,7 +103,7 @@ class STEStandardLibrary
      * @return string
      * @throws RuntimeError
      */
-    public static function in_array($ste, $params, $sub)
+    public static function in_array(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["array"])) {
             throw new RuntimeError("Missing array parameter in <ste:in_array>.");
@@ -122,7 +122,7 @@ class STEStandardLibrary
      * @return string
      * @throws RuntimeError
      */
-    public static function join($ste, $params, $sub)
+    public static function join(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["array"])) {
             throw new RuntimeError("Missing array parameter in <ste:join>.");
@@ -136,7 +136,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @throws RuntimeError
      */
-    public static function split($ste, $params, $sub)
+    public static function split(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["array"])) {
             throw new RuntimeError("Missing array parameter in <ste:split>.");
@@ -153,7 +153,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @throws RuntimeError
      */
-    public static function array_add($ste, $params, $sub)
+    public static function array_add(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["array"])) {
             throw new RuntimeError("Missing array parameter in <ste:array_add>.");
@@ -173,7 +173,7 @@ class STEStandardLibrary
      * @param callable $sub
      * @throws RuntimeError
      */
-    public static function array_filter($ste, $params, $sub)
+    public static function array_filter(STECore $ste, array $params, callable $sub)
     {
         if (empty($params["array"])) {
             throw new RuntimeError("Missing array parameter in <ste:array_filter>.");
diff --git a/src/ste/Scope.php b/src/ste/Scope.php
index ea71634..2ab4e7f 100644
--- a/src/ste/Scope.php
+++ b/src/ste/Scope.php
@@ -15,7 +15,7 @@ class Scope implements \ArrayAccess
      * @return string[]
      * @throws RuntimeError
      */
-    private static function parse_name($name)
+    private static function parse_name(string $name): array
     {
         $remain = $name;
         $fields = [];
@@ -58,7 +58,7 @@ class Scope implements \ArrayAccess
      * @return mixed A reference to the resolved variable
      * @throws VarNotInScope
      */
-    private function &get_topvar_reference($name, $localonly)
+    private function &get_topvar_reference(string $name, bool $localonly)
     {
         if (array_key_exists($name, $this->vars)) {
             $ref = &$this->vars[$name];
@@ -80,7 +80,7 @@ class Scope implements \ArrayAccess
      * @return mixed A reference to the resolved variable
      * @throws RuntimeError
      */
-    public function &get_var_reference($name, $create_if_not_exist, $localonly=false)
+    public function &get_var_reference(string $name, bool $create_if_not_exist, $localonly=false)
     {
         $nullref = null;
 
@@ -133,7 +133,7 @@ class Scope implements \ArrayAccess
      * @param mixed $val
      * @throws RuntimeError
      */
-    public function set_var_by_name($name, $val)
+    public function set_var_by_name(string $name, $val): void
     {
         $ref = &$this->get_var_reference($name, true);
         $ref = $val;
@@ -144,7 +144,7 @@ class Scope implements \ArrayAccess
      * @param mixed $val
      * @throws RuntimeError
      */
-    public function set_local_var($name, $val)
+    public function set_local_var(string $name, $val): void
     {
         $ref = &$this->get_var_reference($name, true, true);
         $ref = $val;
@@ -155,7 +155,7 @@ class Scope implements \ArrayAccess
      * @return mixed Returns an empty string, if not found or unset
      * @throws RuntimeError
      */
-    public function get_var_by_name($name)
+    public function get_var_by_name(string $name)
     {
         $ref = $this->get_var_reference($name, false);
         return $ref === null ? "" : $ref;
@@ -164,7 +164,7 @@ class Scope implements \ArrayAccess
     /**
      * @return self
      */
-    public function new_subscope()
+    public function new_subscope(): self
     {
         $o = new self();
         $o->parent = $this;
diff --git a/src/ste/StorageAccess.php b/src/ste/StorageAccess.php
index 38dea7e..ec7f6bc 100644
--- a/src/ste/StorageAccess.php
+++ b/src/ste/StorageAccess.php
@@ -9,10 +9,10 @@ namespace kch42\ste;
 interface StorageAccess
 {
     /** @var int The template's source */
-    const MODE_SOURCE        = 0;
+    public const MODE_SOURCE        = 0;
 
     /** @var int The compiled template */
-    const MODE_TRANSCOMPILED = 1;
+    public const MODE_TRANSCOMPILED = 1;
 
     /**
      * Loading a template.
@@ -30,7 +30,7 @@ interface StorageAccess
      *
      * @return string|callable Either the sourcecode or a callable function (first, and only parameter: an {@see STECore} instance).
      */
-    public function load($tpl, &$mode);
+    public function load(string $tpl, string &$mode);
 
     /**
      * Saves a template.
@@ -41,5 +41,5 @@ interface StorageAccess
      *
      * @throws CantSaveTemplate If the template could not be saved.
      */
-    public function save($tpl, $data, $mode);
+    public function save(string $tpl, string $data, int $mode): void;
 }
diff --git a/src/ste/TagNode.php b/src/ste/TagNode.php
index cef4220..4adcad8 100644
--- a/src/ste/TagNode.php
+++ b/src/ste/TagNode.php
@@ -18,7 +18,7 @@ class TagNode extends ASTNode
      * @param int $off
      * @param string $name
      */
-    public function __construct($tpl, $off, $name = "")
+    public function __construct(string $tpl, int $off, string $name = "")
     {
         parent::__construct($tpl, $off);
         $this->name = $name;
diff --git a/src/ste/TextNode.php b/src/ste/TextNode.php
index 199c203..c46d71f 100644
--- a/src/ste/TextNode.php
+++ b/src/ste/TextNode.php
@@ -12,7 +12,7 @@ class TextNode extends ASTNode
      * @param int $off
      * @param string $text
      */
-    public function __construct($tpl, $off, $text = "")
+    public function __construct(string $tpl, int $off, string $text = "")
     {
         parent::__construct($tpl, $off);
         $this->text = $text;
diff --git a/src/ste/Transcompiler.php b/src/ste/Transcompiler.php
index 629a023..3955754 100644
--- a/src/ste/Transcompiler.php
+++ b/src/ste/Transcompiler.php
@@ -9,12 +9,12 @@ class Transcompiler
 {
     private static $builtins = null;
 
-    public static function tempvar($typ)
+    public static function tempvar($typ): string
     {
         return $typ . '_' . str_replace('.', '_', uniqid('', true));
     }
 
-    private static function mark_builtin_callable(callable $c)
+    private static function mark_builtin_callable(callable $c): callable
     {
         return $c;
     }
@@ -52,7 +52,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_if($ast)
+    private static function builtin_if(TagNode $ast): string
     {
         $output = "";
         $condition = [];
@@ -91,7 +91,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_cmp($ast)
+    private static function builtin_cmp(TagNode $ast): string
     {
         $operators = [
             ['eq', '=='],
@@ -166,7 +166,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_not($ast)
+    private static function builtin_not(TagNode $ast): string
     {
         $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
         $code .= self::_transcompile($ast->sub);
@@ -179,7 +179,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_even($ast)
+    private static function builtin_even(TagNode $ast): string
     {
         $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
         $code .= self::_transcompile($ast->sub);
@@ -192,7 +192,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_for($ast)
+    private static function builtin_for(TagNode $ast): string
     {
         $code = "";
         $loopname = self::tempvar("forloop");
@@ -259,7 +259,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_foreach($ast)
+    private static function builtin_foreach(TagNode $ast): string
     {
         $loopname = self::tempvar("foreachloop");
         $code = "";
@@ -331,7 +331,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_infloop($ast)
+    private static function builtin_infloop(TagNode $ast): string
     {
         return "while(true)\n{\n" . self::indent_code(self::loopbody(self::indent_code(self::_transcompile($ast->sub)))) . "\n}\n";
     }
@@ -340,7 +340,7 @@ class Transcompiler
      * @param TagNode $ast
      * @return string
      */
-    private static function builtin_break($ast)
+    private static function builtin_break(TagNode $ast): string
     {
         return "throw new \\kch42\\ste\\BreakException();\n";
     }
@@ -349,7 +349,7 @@ class Transcompiler
      * @param TagNode $ast
      * @return string
      */
-    private static function builtin_continue($ast)
+    private static function builtin_continue(TagNode $ast): string
     {
         return "throw new \\kch42\\ste\\ContinueException();\n";
     }
@@ -359,7 +359,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_block($ast)
+    private static function builtin_block(TagNode $ast): string
     {
         if (empty($ast->params["name"])) {
             throw new ParseCompileError("self::Transcompile Error: name missing in <ste:block>.", $ast->tpl, $ast->offset);
@@ -386,7 +386,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_load($ast)
+    private static function builtin_load(TagNode $ast): string
     {
         if (empty($ast->params["name"])) {
             throw new ParseCompileError("self::Transcompile Error: name missing in <ste:load>.", $ast->tpl, $ast->offset);
@@ -402,7 +402,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_mktag($ast)
+    private static function builtin_mktag(TagNode $ast): string
     {
         $code = "";
 
@@ -438,7 +438,7 @@ class Transcompiler
      * @param TagNode $ast
      * @return string
      */
-    private static function builtin_tagcontent($ast)
+    private static function builtin_tagcontent(TagNode $ast): string
     {
         return "\$outputstack[\$outputstack_i] .= \$sub(\$ste);";
     }
@@ -448,7 +448,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_set($ast)
+    private static function builtin_set(TagNode $ast): string
     {
         if (empty($ast->params["var"])) {
             throw new ParseCompileError("self::Transcompile Error: var missing in <ste:set>.", $ast->tpl, $ast->offset);
@@ -470,7 +470,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_setlocal($ast)
+    private static function builtin_setlocal(TagNode $ast): string
     {
         if (empty($ast->params["var"])) {
             throw new ParseCompileError("self::Transcompile Error: var missing in <ste:set>.", $ast->tpl, $ast->offset);
@@ -492,7 +492,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_get($ast)
+    private static function builtin_get(TagNode $ast): string
     {
         if (empty($ast->params["var"])) {
             throw new ParseCompileError("self::Transcompile Error: var missing in <ste:get>.", $ast->tpl, $ast->offset);
@@ -507,7 +507,7 @@ class Transcompiler
      * @return string
      * @throws ParseCompileError
      */
-    private static function builtin_calc($ast)
+    private static function builtin_calc(TagNode $ast): string
     {
         $code = "\$outputstack[] = '';\n\$outputstack_i++;\n";
         $code .= self::_transcompile($ast->sub);
@@ -516,7 +516,7 @@ class Transcompiler
         return $code;
     }
 
-    private static function indent_code($code)
+    private static function indent_code(string $code): string
     {
         return implode(
             "\n",
@@ -526,7 +526,7 @@ class Transcompiler
         );
     }
 
-    private static function loopbody($code)
+    private static function loopbody(string $code): string
     {
         return "try\n{\n" . self::indent_code($code) . "\n}\ncatch(\\kch42\\ste\\BreakException \$e) { break; }\ncatch(\\kch42\\ste\\ContinueException \$e) { continue; }\n";
     }
@@ -537,7 +537,7 @@ class Transcompiler
      * @return array|string
      * @throws ParseCompileError
      */
-    private static function _transcompile($ast, $avoid_outputstack = false)
+    private static function _transcompile(array $ast, bool $avoid_outputstack = false)
     { /* The real self::transcompile function, does not add boilerplate code. */
         $code = "";
 
@@ -599,7 +599,7 @@ class Transcompiler
      *                parameter and returns a string (everything that was not packed into a section).
      * @throws ParseCompileError
      */
-    public static function transcompile($ast)
+    public static function transcompile(array $ast): string
     { /* self::Transcompile and add some boilerplate code. */
         $boilerplate = "\$outputstack = array('');\n\$outputstack_i = 0;\n";
         return "function(\$ste)\n{\n" . self::indent_code($boilerplate . self::_transcompile($ast) . "return array_pop(\$outputstack);") . "\n}";
diff --git a/src/ste/VariableNode.php b/src/ste/VariableNode.php
index fbe1efc..f5a0b26 100644
--- a/src/ste/VariableNode.php
+++ b/src/ste/VariableNode.php
@@ -13,7 +13,7 @@ class VariableNode extends ASTNode
     /**
      * @return string
      */
-    public function transcompile()
+    public function transcompile(): string
     {
         $varaccess = '@$ste->scope[' . (is_numeric($this->name) ? $this->name : '"' . Misc::escape_text($this->name) . '"'). ']';
         foreach ($this->arrayfields as $af) {
diff --git a/tests/functional/TestStorage.php b/tests/functional/TestStorage.php
index 2403668..ff8512a 100644
--- a/tests/functional/TestStorage.php
+++ b/tests/functional/TestStorage.php
@@ -15,13 +15,13 @@ class TestStorage implements StorageAccess
         $this->dir = $dir;
     }
 
-    public function load($tpl, &$mode)
+    public function load(string $tpl, string &$mode)
     {
         $mode = StorageAccess::MODE_SOURCE;
         return file_get_contents($this->dir . DIRECTORY_SEPARATOR . $tpl);
     }
 
-    public function save($tpl, $data, $mode)
+    public function save(string $tpl, string $data, $mode): void
     {
         if ($mode != StorageAccess::MODE_TRANSCOMPILED) {
             return;