ProcessFast / yii2-minify-view

<?php

/**

 * HtmlCompressor.php

 * @author Revin Roman

 * @link https://processfast.ru

 */

namespace processfast\yii\minify;

/**

 * Class HtmlCompressor

 * @package processfast\yii\minify

 */

class HtmlCompressor

{

    /**

     * @param string $data is either a handle to an open file, or an HTML string

     * @param null|array $options key => value array of execute options

     * The possible keys are:

     *

     *  - `c` or `no-comments` - removes HTML comments

     *  - `s` or `stats` - output filesize savings calculation

     *  - `x` or `extra` - perform extra (possibly unsafe) compression operations

     *

     * Example: HtmlCompressor::compress($HtmlCode, $options = ['no-comments' => true])

     *

     * @return string

     */

    public static function compress($data, $options = null)

    {

        return (new static)

            ->htmlCompress($data, $options);

    }

    /**

     * HTML Compressor 1.0.1

     * Original Author: Tyler Hall <[email protected]>

     * Edited by: Revin Roman <[email protected]>

     * Latest Source and Bug Tracker: http://github.com/tylerhall/html-compressor

     *

     * Attemps to reduce the filesize of an HTML document by removing unnecessary

     * whitespace at the beginning and end of lines, inside closing tags, and

     * stripping blank lines completely. <pre> tags are respected and their contents

     * are left alone. Warning, nested <pre> tags may exhibit unexpected behaviour.

     *

     * This code is licensed under the MIT Open Source License.

     * Copyright (c) 2010 [email protected]

     * Permission is hereby granted, free of charge, to any person obtaining a copy

     * of this software and associated documentation files (the "Software"), to deal

     * in the Software without restriction, including without limitation the rights

     * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

     * copies of the Software, and to permit persons to whom the Software is

     * furnished to do so, subject to the following conditions:

     *

     * The above copyright notice and this permission notice shall be included in

     * all copies or substantial portions of the Software.

     *

     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

     * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

     * THE SOFTWARE.

     *

     * @param $data

     * @param null|array $options

     * @return bool|mixed|string

     */

    private function htmlCompress($data, $options = null)

    {

        if (!isset($options)) {

            $options = [];

        }

        $data .= "\n";

        $out = '';

        $inside_pre = false;

        $inside_textarea = false;

        $bytecount = 0;

        while ($line = $this->getLine($data)) {

            $bytecount += strlen($line);

            if ($inside_pre) {

                list($line, $inside_pre) = $this->checkInsidePre($line);

            } elseif ($inside_textarea) {

                list($line, $inside_textarea) = $this->checkInsideTextarea($line);

            } else {

                if (strpos($line, '<pre') !== false) {

                    // Only trim the beginning since we just entered a <pre> block...

                    $line = ltrim($line);

                    // If the <pre> ends on the same line, don't turn on $inside_pre...

                    list($line, $inside_pre) = $this->checkInsidePre($line);

                } elseif (strpos($line, '<textarea') !== false) {

                    // Only trim the beginning since we just entered a <textarea> block...

                    $line = ltrim($line);

                    // If the <textarea> ends on the same line, don't turn on $inside_textarea...

                    list($line, $inside_textarea) = $this->checkInsideTextarea($line);

                } else {

                    // Since we're not inside a <pre> block, we can trim both ends of the line

                    $line = trim($line);

                    // And condense multiple spaces down to one

                    $line = preg_replace('/\s\s+/', ' ', $line);

                }

            }

            // Filter out any blank lines that aren't inside a <pre> block...

            if ($inside_pre || $inside_textarea) {

                $out .= $line;

            } elseif ($line != '') {

                $out .= $line . "\n";

            }

        }

        // Perform any extra (unsafe) compression techniques...

        if (array_key_exists('x', $options) || array_key_exists('extra', $options)) {

            // Can break layouts that are dependent on whitespace between tags

            $out = str_replace(">\n<", '><', $out);

        }

        // Remove HTML comments...

        if (array_key_exists('c', $options) || array_key_exists('no-comments', $options)) {

            $out = preg_replace('/(<!--.*?-->)/ms', '', $out);

            $out = str_replace('<!>', '', $out);

        }

        // Remove the trailing \n

        $out = trim($out);

        // Output either our stats or the compressed data...

        if (array_key_exists('s', $options) || array_key_exists('stats', $options)) {

            $echo = '';

            $echo .= "Original Size: $bytecount\n";

            $echo .= "Compressed Size: " . strlen($out) . "\n";

            $echo .= "Savings: " . round((1 - strlen($out) / $bytecount) * 100, 2) . "%\n";

            echo $echo;

        } else {

            return $out;

        }

        return false;

    }

    /**

     * @param $line

     * @return array

     * @codeCoverageIgnore

     */

    {

        $inside_pre = true;

        if ((strpos($line, '</pre') !== false) && (strripos($line, '</pre') >= strripos($line, '<pre'))) {

            $line = rtrim($line);

            $inside_pre = false;

        }

        return [$line, $inside_pre];

    }

    /**

     * @param $line

     * @return array

     * @codeCoverageIgnore

     */

    {

        $inside_textarea = true;

        if ((strpos($line, '</textarea') !== false) && (strripos($line, '</textarea') >= strripos($line, '<textarea'))) {

            $line = rtrim($line);

            $inside_textarea = false;

        }

        return [$line, $inside_textarea];

    }

    /**

     * Returns the next line from an open file handle or a string

     * @param $data

     * @return bool|string

     * @codeCoverageIgnore

     */

    private function getLine(&$data)

    {

        if (is_resource($data)) {

            return fgets($data);

        }

        if (is_string($data)) {

            if (strlen($data) > 0) {

                $pos = strpos($data, "\n");

                $return = substr($data, 0, $pos) . "\n";

                $data = substr($data, $pos + 1);

                return $return;

            } else {

                return false;

            }

        }

        return false;

    }

    /**

     * @param $data

     * @param null|array $options

     * @return bool|mixed|string

     * @deprecated

     * @codeCoverageIgnore

     */

    private function html_compress($data, $options = null)

    {

        \Yii::warning(sprintf('You are using an deprecated method `%s`.', 'html_compress'));

        return $this->htmlCompress($data, $options);

    }

    /**

     * Returns the next line from an open file handle or a string

     * @param $data

     * @return bool|string

     * @deprecated

     * @codeCoverageIgnore

     */

    private function get_line(&$data)

    {

        \Yii::warning(sprintf('You are using an deprecated method `%s`.', 'get_line'));

        return $this->getLine($data);

    }

}