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author | Kevin Chabowski <kevin@kch42.de> | 2014-05-24 14:55:11 +0200 |
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committer | Kevin Chabowski <kevin@kch42.de> | 2014-05-24 14:55:11 +0200 |
commit | d48be01fff31a7a9d611802721aa70532d251c3a (patch) | |
tree | 53ac39214a27855a6521f91ea448e39ffcd7866b /src/Scope.php | |
parent | 3c51baa4167d5a68ff010dc81525b9340c5f1329 (diff) | |
download | ste-d48be01fff31a7a9d611802721aa70532d251c3a.tar.gz ste-d48be01fff31a7a9d611802721aa70532d251c3a.tar.bz2 ste-d48be01fff31a7a9d611802721aa70532d251c3a.zip |
Moved to src/ste for psr-4 compliance1.0.0
Diffstat (limited to 'src/Scope.php')
-rw-r--r-- | src/Scope.php | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/src/Scope.php b/src/Scope.php deleted file mode 100644 index 0da2724..0000000 --- a/src/Scope.php +++ /dev/null @@ -1,146 +0,0 @@ -<?php - -namespace kch42\ste; - -class Scope implements \ArrayAccess { - private $parent = NULL; - private $vars = array(); - - private static function parse_name($name) { - $remain = $name; - $fields = array(); - - while($remain !== "") { - $br_open = strpos($remain, '['); - if($br_open === false) { - $fields[] = $remain; - break; - } - - $br_close = strpos($remain, ']', $br_open); - if($br_close === false) { - throw new RuntimeError("Invalid varname \"$name\". Missing closing \"]\"."); - } - - $fields[] = substr($remain, 0, $br_open); - - $field = substr($remain, $br_open+1, $br_close-$br_open-1); - $more = substr($remain, $br_close+1); - - if(strpos($field, '[') !== false) { - throw new RuntimeError("A variable field must not contain a '[' character."); - } - - if((strlen($more) > 0) && ($more[0] !== '[')) { - // TODO: better error message, not very non-programmer friendly... - throw new RuntimeError("A variable name must be of format name('[' name ']')*."); - } - - $remain = $field . $more; - } - - return $fields; - } - - private function &get_topvar_reference($name, $localonly) { - if(array_key_exists($name, $this->vars)) { - $ref = &$this->vars[$name]; - return $ref; - } - - if((!$localonly) && ($this->parent !== NULL)) { - $ref = &$this->parent->get_topvar_reference($name, $localonly); - return $ref; - } - - throw new VarNotInScope(); - } - - public function &get_var_reference($name, $create_if_not_exist, $localonly=false) { - $nullref = NULL; - - $fields = self::parse_name($name); - if(count($fields) == 0) { - return $nullref; // TODO: or should we throw an exception here? - } - - $first = $fields[0]; - - $ref = NULL; - try { - $ref = &$this->get_topvar_reference($first, $localonly); - } catch(VarNotInScope $e) { - if($create_if_not_exist) { - $this->vars[$first] = (count($fields) > 0) ? array() : ""; - $ref = &$this->vars[$first]; - } else { - return $nullref; - } - } - - for($i = 1; $i < count($fields); $i++) { - $field = $fields[$i]; - - if(!is_array($ref)) { - return $nullref; - } - - if(!array_key_exists($field, $ref)) { - if(!$create_if_not_exist) { - return $nullref; - } - - if($i < count($fields) - 1) { - $ref[$field] = array(); - } else { - $ref[$field] = ""; - } - } - - $ref = &$ref[$field]; - } - - return $ref; - } - - public function set_var_by_name($name, $val) { - $ref = &$this->get_var_reference($name, true); - $ref = $val; - } - - public function set_local_var($name, $val) { - $ref = &$this->get_var_reference($name, true, true); - $ref = $val; - } - - public function get_var_by_name($name) { - $ref = $this->get_var_reference($name, false); - return $ref === NULL ? "" : $ref; - } - - public function new_subscope() { - $o = new self(); - $o->parent = $this; - return $o; - } - - /* implementing ArrayAccess */ - - public function offsetSet($offset, $value) { - $this->set_var_by_name($offset, $value); - } - public function offsetGet($offset) { - return $this->get_var_by_name($offset); - } - public function offsetExists($offset) { - try { - $this->get_topvar_reference($offset); - return true; - } catch(VarNotInScope $e) { - return false; - } - } - public function offsetUnset($offset) { - unset($this->vars[$offset]); - } -} |