src/ast/stmt/ContinueStmt.php
<?php
/**
* Quack Compiler and toolkit
* Copyright (C) 2015-2017 Quack and CONTRIBUTORS
*
* This file is part of Quack.
*
* Quack is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Quack is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Quack. If not, see <http://www.gnu.org/licenses/>.
*/
namespace QuackCompiler\Ast\Stmt;
use \QuackCompiler\Intl\Localization;
use \QuackCompiler\Parser\Parser;
use \QuackCompiler\Scope\Symbol;
use \QuackCompiler\Scope\Meta;
use \QuackCompiler\Scope\ScopeError;
class ContinueStmt extends Stmt
{
public $label;
public $is_explicit;
public function __construct($label = null)
{
$this->label = $label;
$this->is_explicit = null !== $label;
}
public function format(Parser $parser)
{
$source = 'continue';
if ($this->is_explicit) {
$source .= ' ';
$source .= $this->label;
}
$source .= PHP_EOL;
return $source;
}
public function injectScope($parent_scope)
{
if (!$this->is_explicit) {
// Check if there is an implicit label
$label = $parent_scope->getMetaInContext(Meta::M_LABEL);
// If there is no implicit labels in the context, then the user is
// calling 'continue' outsite a loop.
if (null === $label) {
throw new ScopeError(Localization::message('SCO140', ['continue']));
}
} else {
$meta_label = $parent_scope->getMetaInContext(Meta::M_LABEL);
// If meta_label is null, the user is calling 'continue' outside a loop
if (null === $meta_label) {
throw new ScopeError(Localization::message('SCO140', ['continue']));
}
$label = $parent_scope->lookup($this->label);
// When the symbol doesn't exist
if (null === $label) {
throw new ScopeError(Localization::message('SCO150', ['continue', $this->label]));
}
// When the symbol exist, but it's not a label
if (~$label & Symbol::S_LABEL) {
// When the symbol exist, but it's not a label
throw new ScopeError(Localization::message('SCO160', ['continue', $this->label]));
}
$refcount = $parent_scope->getMeta(Meta::M_REF_COUNT, $this->label);
if (null === $refcount) {
$parent_scope->setMeta(Meta::M_REF_COUNT, $this->label, 1);
} else {
$parent_scope->setMeta(Meta::M_REF_COUNT, $this->label, $refcount + 1);
}
}
}
public function runTypeChecker()
{
// Pass
}
}