File io/template/parser/syntax/TemplateSyntaxParser.class.php

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<?php
/**
 * template = (variableExpression | expression | condition | loop | include | text)*
 * variableExpression = "{", variable, "}"
 * expression = "${", expressionContent, "}"
 * condition = "# IF ", "NOT "?, expression, "#", template, ("# ELSE #, template)?, "# ENDIF #"
 * loop = "# START ", expression, " #", template, "# END (?:name)? #"
 * include = "# INCLUDE ", name, " #"
 * text = .+
 * expressionContent = array | function | variable | constant
 * function = "\(\w+::\)?\w+\(", parameters, "\)"
 * parameters = expressionContent | (expressionContent, (",", expressionContent)+)
 * variable = simpleVar | loopVar
 * constant = "'.+'" | [0-9]+ | array
 * array = "array(", arrayContent, ")"
 * arrayContent = arrayElement | (arrayElement, (",", arrayElement)+)
 * arrayElement = expressionContent | ("'\w+'\s*=>\s*", expressionContent)
 * simpleVar = "\w+"
 * loopVar = "(\w+\.)+\w+"
 * @package     IO
 * @subpackage  Template\parser\syntax
 * @copyright   &copy; 2005-2019 PHPBoost
 * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU/GPL-3.0
 * @author      Benoit SAUTEL <ben.popeye@phpboost.com>
 * @version     PHPBoost 5.2 - last update: 2014 12 22
 * @since       PHPBoost 3.0 - 2010 06 17
 * @contributor Loic ROUCHON <horn@phpboost.com>
*/

class TemplateSyntaxParser implements TemplateParser
{
    /**
     * @var StringInputStream
     */
    private $input;
    /**
     * @var StringOutputStream
     */
    private $output;

    public function parse($content)
    {
        $this->input = new StringInputStream($content);
        $this->output = new StringOutputStream();
        $this->output->write('<?php ' . TemplateSyntaxElement::RESULT . '=\'');
        $this->do_parse();
        $this->output->write('\'; ?>');
        return $this->output->to_string();
    }

    private function do_parse()
    {
        $template_element = new TextTemplateSyntaxElement();
        $template_element->parse(new TemplateSyntaxParserContext(), $this->input, $this->output);
        if ($this->input->has_next())
        {
            throw new TemplateRenderingException('Unknown statement', $this->input);
        }
    }
}
?>