Merge pull request #794 from dawnbreak/dev

Replace Mardownify library with html-to-markdown library.

23 files changed, 1581 insertions, 0 deletions

diff --git a/vendor/league/html-to-markdown/src/Configuration.php b/vendor/league/html-to-markdown/src/Configuration.php
new file mode 100644
index 000000000..2943383aa
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Configuration.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace League\HTMLToMarkdown;
+
+class Configuration
+{
+    protected $config;
+
+    /**
+     * @param array $config
+     */
+    public function __construct(array $config = array())
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param array $config
+     */
+    public function merge(array $config = array())
+    {
+        $this->config = array_replace_recursive($this->config, $config);
+    }
+
+    /**
+     * @param array $config
+     */
+    public function replace(array $config = array())
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param string $key
+     * @param mixed  $value
+     */
+    public function setOption($key, $value)
+    {
+        $this->config[$key] = $value;
+    }
+
+    /**
+     * @param string|null $key
+     * @param mixed|null  $default
+     *
+     * @return mixed|null
+     */
+    public function getOption($key = null, $default = null)
+    {
+        if ($key === null) {
+            return $this->config;
+        }
+
+        if (!isset($this->config[$key])) {
+            return $default;
+        }
+
+        return $this->config[$key];
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/ConfigurationAwareInterface.php b/vendor/league/html-to-markdown/src/ConfigurationAwareInterface.php
new file mode 100644
index 000000000..8aca530be
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/ConfigurationAwareInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace League\HTMLToMarkdown;
+
+interface ConfigurationAwareInterface
+{
+    /**
+     * @param Configuration $config
+     */
+    public function setConfig(Configuration $config);
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/BlockquoteConverter.php b/vendor/league/html-to-markdown/src/Converter/BlockquoteConverter.php
new file mode 100644
index 000000000..eb2d09d17
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/BlockquoteConverter.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class BlockquoteConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        // Contents should have already been converted to Markdown by this point,
+        // so we just need to add '>' symbols to each line.
+
+        $markdown = '';
+
+        $quote_content = trim($element->getValue());
+
+        $lines = preg_split('/\r\n|\r|\n/', $quote_content);
+
+        $total_lines = count($lines);
+
+        foreach ($lines as $i => $line) {
+            $markdown .= '> ' . $line . "\n";
+            if ($i + 1 === $total_lines) {
+                $markdown .= "\n";
+            }
+        }
+
+        return $markdown;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('blockquote');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/CodeConverter.php b/vendor/league/html-to-markdown/src/Converter/CodeConverter.php
new file mode 100644
index 000000000..c8ec2c005
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/CodeConverter.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class CodeConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $language = null;
+
+        // Checking for language class on the code block
+        $classes = $element->getAttribute('class');
+
+        if ($classes) {
+            // Since tags can have more than one class, we need to find the one that starts with 'language-'
+            $classes = explode(' ', $classes);
+            foreach ($classes as $class) {
+                if (strpos($class, 'language-') !== false) {
+                    // Found one, save it as the selected language and stop looping over the classes.
+                    // The space after the language avoids gluing the actual code with the language tag
+                    $language = str_replace('language-', '', $class) . ' ';
+                    break;
+                }
+            }
+        }
+
+        $markdown = '';
+        $code = html_entity_decode($element->getChildrenAsString());
+
+        // In order to remove the code tags we need to search for them and, in the case of the opening tag
+        // use a regular expression to find the tag and the other attributes it might have
+        $code = preg_replace('/<code\b[^>]*>/', '', $code);
+        $code = str_replace('</code>', '', $code);
+
+        // Checking if the code has multiple lines
+        $lines = preg_split('/\r\n|\r|\n/', $code);
+        if (count($lines) > 1) {
+            // Multiple lines detected, adding three backticks and newlines
+            $markdown .= '```' . $language . "\n" . $code . "\n" . '```';
+        } else {
+            // One line of code, wrapping it on one backtick.
+            $markdown .= '`' . $language . $code . '`';
+        }
+
+        return $markdown;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('code');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/CommentConverter.php b/vendor/league/html-to-markdown/src/Converter/CommentConverter.php
new file mode 100644
index 000000000..55038b254
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/CommentConverter.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class CommentConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        return '';
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('#comment');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/ConverterInterface.php b/vendor/league/html-to-markdown/src/Converter/ConverterInterface.php
new file mode 100644
index 000000000..8530559a0
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/ConverterInterface.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+interface ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element);
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags();
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/DefaultConverter.php b/vendor/league/html-to-markdown/src/Converter/DefaultConverter.php
new file mode 100644
index 000000000..964a71093
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/DefaultConverter.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\Configuration;
+use League\HTMLToMarkdown\ConfigurationAwareInterface;
+use League\HTMLToMarkdown\ElementInterface;
+
+class DefaultConverter implements ConverterInterface, ConfigurationAwareInterface
+{
+    const DEFAULT_CONVERTER = '_default';
+
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @param Configuration $config
+     */
+    public function setConfig(Configuration $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        // If strip_tags is false (the default), preserve tags that don't have Markdown equivalents,
+        // such as <span> nodes on their own. C14N() canonicalizes the node to a string.
+        // See: http://www.php.net/manual/en/domnode.c14n.php
+        if ($this->config->getOption('strip_tags', false)) {
+            return $element->getValue();
+        }
+
+        return html_entity_decode($element->getChildrenAsString());
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array(self::DEFAULT_CONVERTER);
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/DivConverter.php b/vendor/league/html-to-markdown/src/Converter/DivConverter.php
new file mode 100644
index 000000000..656a0ba4d
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/DivConverter.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\Configuration;
+use League\HTMLToMarkdown\ConfigurationAwareInterface;
+use League\HTMLToMarkdown\ElementInterface;
+
+class DivConverter implements ConverterInterface, ConfigurationAwareInterface
+{
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @param Configuration $config
+     */
+    public function setConfig(Configuration $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        if ($this->config->getOption('strip_tags', false)) {
+            return $element->getValue() . "\n\n";
+        }
+
+        return html_entity_decode($element->getChildrenAsString());
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('div');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/EmphasisConverter.php b/vendor/league/html-to-markdown/src/Converter/EmphasisConverter.php
new file mode 100644
index 000000000..67250769b
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/EmphasisConverter.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\Configuration;
+use League\HTMLToMarkdown\ConfigurationAwareInterface;
+use League\HTMLToMarkdown\ElementInterface;
+
+class EmphasisConverter implements ConverterInterface, ConfigurationAwareInterface
+{
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @param Configuration $config
+     */
+    public function setConfig(Configuration $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $tag = $element->getTagName();
+        $value = $element->getValue();
+
+        if (!trim($value)) {
+            return '';
+        }
+
+        if ($tag === 'i' || $tag === 'em') {
+            $style = $this->config->getOption('italic_style');
+        } else {
+            $style = $this->config->getOption('bold_style');
+        }
+
+        $prefix = ltrim($value) !== $value ? ' ' : '';
+        $suffix = rtrim($value) !== $value ? ' ' : '';
+
+        return $prefix . $style . trim($value) . $style . $suffix;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('em', 'i', 'strong', 'b');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/HardBreakConverter.php b/vendor/league/html-to-markdown/src/Converter/HardBreakConverter.php
new file mode 100644
index 000000000..37cd44e73
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/HardBreakConverter.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\Configuration;
+use League\HTMLToMarkdown\ConfigurationAwareInterface;
+use League\HTMLToMarkdown\ElementInterface;
+
+class HardBreakConverter implements ConverterInterface, ConfigurationAwareInterface
+{
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @param Configuration $config
+     */
+    public function setConfig(Configuration $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        return $this->config->getOption('hard_break') ? "\n" : "  \n";
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('br');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/HeaderConverter.php b/vendor/league/html-to-markdown/src/Converter/HeaderConverter.php
new file mode 100644
index 000000000..d117e7d36
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/HeaderConverter.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\Configuration;
+use League\HTMLToMarkdown\ConfigurationAwareInterface;
+use League\HTMLToMarkdown\ElementInterface;
+
+class HeaderConverter implements ConverterInterface, ConfigurationAwareInterface
+{
+    const STYLE_ATX = 'atx';
+    const STYLE_SETEXT = 'setext';
+
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @param Configuration $config
+     */
+    public function setConfig(Configuration $config)
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $level = (int) substr($element->getTagName(), 1, 1);
+        $style = $this->config->getOption('header_style', self::STYLE_SETEXT);
+
+        if (($level === 1 || $level === 2) && !$element->isDescendantOf('blockquote') && $style === self::STYLE_SETEXT) {
+            return $this->createSetextHeader($level, $element->getValue());
+        }
+
+        return $this->createAtxHeader($level, $element->getValue());
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('h1', 'h2', 'h3', 'h4', 'h5', 'h6');
+    }
+
+    /**
+     * @param int    $level
+     * @param string $content
+     *
+     * @return string
+     */
+    private function createSetextHeader($level, $content)
+    {
+        $length = function_exists('mb_strlen') ? mb_strlen($content, 'utf-8') : strlen($content);
+        $underline = ($level === 1) ? '=' : '-';
+
+        return $content . "\n" . str_repeat($underline, $length) . "\n\n";
+    }
+
+    /**
+     * @param int    $level
+     * @param string $content
+     *
+     * @return string
+     */
+    private function createAtxHeader($level, $content)
+    {
+        $prefix = str_repeat('#', $level) . ' ';
+
+        return $prefix . $content . "\n\n";
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/HorizontalRuleConverter.php b/vendor/league/html-to-markdown/src/Converter/HorizontalRuleConverter.php
new file mode 100644
index 000000000..8f54f9397
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/HorizontalRuleConverter.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class HorizontalRuleConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        return "- - - - - -\n\n";
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('hr');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/ImageConverter.php b/vendor/league/html-to-markdown/src/Converter/ImageConverter.php
new file mode 100644
index 000000000..657c769c2
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/ImageConverter.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class ImageConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $src = $element->getAttribute('src');
+        $alt = $element->getAttribute('alt');
+        $title = $element->getAttribute('title');
+
+        if ($title !== '') {
+            // No newlines added. <img> should be in a block-level element.
+            return '![' . $alt . '](' . $src . ' "' . $title . '")';
+        }
+
+        return '![' . $alt . '](' . $src . ')';
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('img');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/LinkConverter.php b/vendor/league/html-to-markdown/src/Converter/LinkConverter.php
new file mode 100644
index 000000000..f0765f38b
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/LinkConverter.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class LinkConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $href = $element->getAttribute('href');
+        $title = $element->getAttribute('title');
+        $text = trim($element->getValue());
+
+        if ($title !== '') {
+            $markdown = '[' . $text . '](' . $href . ' "' . $title . '")';
+        } elseif ($href === $text && $this->isValidAutolink($href)) {
+            $markdown = '<' . $href . '>';
+        } else {
+            $markdown = '[' . $text . '](' . $href . ')';
+        }
+
+        if (!$href) {
+            $markdown = html_entity_decode($element->getChildrenAsString());
+        }
+
+        return $markdown;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('a');
+    }
+
+    /**
+     * @param string $href
+     *
+     * @return bool
+     */
+    private function isValidAutolink($href)
+    {
+        return preg_match('/^[A-Za-z][A-Za-z0-9.+-]{1,31}:[^<>\x00-\x20]*/i', $href) === 1;
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/ListBlockConverter.php b/vendor/league/html-to-markdown/src/Converter/ListBlockConverter.php
new file mode 100644
index 000000000..07a4c85a9
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/ListBlockConverter.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class ListBlockConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        return $element->getValue() . "\n";
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('ol', 'ul');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/ListItemConverter.php b/vendor/league/html-to-markdown/src/Converter/ListItemConverter.php
new file mode 100644
index 000000000..dafec077c
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/ListItemConverter.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class ListItemConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        // If parent is an ol, use numbers, otherwise, use dashes
+        $list_type = $element->getParent()->getTagName();
+
+        // Add spaces to start for nested list items
+        $level = $element->getListItemLevel($element);
+
+        $prefixForParagraph = str_repeat('  ', $level + 1);
+        $value = trim(implode("\n" . $prefixForParagraph, explode("\n", trim($element->getValue()))));
+
+        // If list item is the first in a nested list, add a newline before it
+        $prefix = '';
+        if ($level > 0 && $element->getSiblingPosition() === 1) {
+            $prefix = "\n";
+        }
+
+        if ($list_type === 'ul') {
+            return $prefix . '- ' . $value . "\n";
+        }
+
+        $number = $element->getSiblingPosition();
+
+        return $prefix . $number . '. ' . $value . "\n";
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('li');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/ParagraphConverter.php b/vendor/league/html-to-markdown/src/Converter/ParagraphConverter.php
new file mode 100644
index 000000000..cf852bfcf
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/ParagraphConverter.php
@@ -0,0 +1,124 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class ParagraphConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $value = $element->getValue();
+
+        $markdown = '';
+
+        $lines = preg_split('/\r\n|\r|\n/', $value);
+        foreach ($lines as $line) {
+            /*
+             * Some special characters need to be escaped based on the position that they appear
+             * The following function will deal with those special cases.
+             */
+            $markdown .= $this->escapeSpecialCharacters($line);
+            $markdown .= "\n";
+        }
+
+        return trim($markdown) !== '' ? rtrim($markdown) . "\n\n" : '';
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('p');
+    }
+
+    /**
+     * @param string $line
+     *
+     * @return string
+     */
+    private function escapeSpecialCharacters($line)
+    {
+        $line = $this->escapeFirstCharacters($line);
+        $line = $this->escapeOtherCharacters($line);
+        $line = $this->escapeOtherCharactersRegex($line);
+
+        return $line;
+    }
+
+    /**
+     * @param string $line
+     *
+     * @return string
+     */
+    private function escapeFirstCharacters($line)
+    {
+        $escapable = array(
+            '>',
+            '- ',
+            '+ ',
+            '--',
+            '~~~',
+            '---',
+            '- - -'
+        );
+
+        foreach ($escapable as $i) {
+            if (strpos(ltrim($line), $i) === 0) {
+                // Found a character that must be escaped, adding a backslash before
+                return '\\' . ltrim($line);
+            }
+        }
+
+        return $line;
+    }
+
+    /**
+     * @param string $line
+     *
+     * @return string
+     */
+    private function escapeOtherCharacters($line)
+    {
+        $escapable = array(
+            '<!--'
+        );
+
+        foreach ($escapable as $i) {
+            if (strpos($line, $i) !== false) {
+                // Found an escapable character, escaping it
+                $line = substr_replace($line, '\\', strpos($line, $i), 0);
+            }
+        }
+
+        return $line;
+    }
+
+    /**
+     * @param string $line
+     *
+     * @return string
+     */
+    private function escapeOtherCharactersRegex($line)
+    {
+        $regExs = array(
+            // Match numbers ending on ')' or '.' that are at the beginning of the line.
+            '/^[0-9]+(?=\)|\.)/'
+        );
+
+        foreach ($regExs as $i) {
+            if (preg_match($i, $line, $match)) {
+                // Matched an escapable character, adding a backslash on the string before the offending character
+                $line = substr_replace($line, '\\', strlen($match[0]), 0);
+            }
+        }
+
+        return $line;
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/PreformattedConverter.php b/vendor/league/html-to-markdown/src/Converter/PreformattedConverter.php
new file mode 100644
index 000000000..7a4ec3357
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/PreformattedConverter.php
@@ -0,0 +1,59 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class PreformattedConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $markdown = '';
+
+        $pre_content = html_entity_decode($element->getChildrenAsString());
+        $pre_content = str_replace(array('<pre>', '</pre>'), '', $pre_content);
+
+        /*
+         * Checking for the code tag.
+         * Usually pre tags are used along with code tags. This conditional will check for already converted code tags,
+         * which use backticks, and if those backticks are at the beginning and at the end of the string it means
+         * there's no more information to convert.
+         */
+
+        $firstBacktick = strpos(trim($pre_content), '`');
+        $lastBacktick = strrpos(trim($pre_content), '`');
+        if ($firstBacktick === 0 && $lastBacktick === strlen(trim($pre_content)) - 1) {
+            return $pre_content;
+        }
+
+        // If the execution reaches this point it means it's just a pre tag, with no code tag nested
+
+        // Normalizing new lines
+        $pre_content = preg_replace('/\r\n|\r|\n/', PHP_EOL, $pre_content);
+
+        // Checking if the string has multiple lines
+        $lines = preg_split('/\r\n|\r|\n/', $pre_content);
+        if (count($lines) > 1) {
+            // Multiple lines detected, adding three backticks and newlines
+            $markdown .= '```' . "\n" . $pre_content . "\n" . '```';
+        } else {
+            // One line of code, wrapping it on one backtick.
+            $markdown .= '`' . $pre_content . '`';
+        }
+
+        return $markdown;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('pre');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Converter/TextConverter.php b/vendor/league/html-to-markdown/src/Converter/TextConverter.php
new file mode 100644
index 000000000..d6d91e16f
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Converter/TextConverter.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class TextConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $markdown = $element->getValue();
+
+        // Remove leftover \n at the beginning of the line
+        $markdown = ltrim($markdown, "\n");
+
+        // Replace sequences of invisible characters with spaces
+        $markdown = preg_replace('~\s+~u', ' ', $markdown);
+
+        // Escape the following characters: '*', '_', '[', ']' and '\'
+        $markdown = preg_replace('~([*_\\[\\]\\\\])~u', '\\\\$1', $markdown);
+
+        $markdown = preg_replace('~^#~u', '\\\\#', $markdown);
+
+        if ($markdown === ' ') {
+            $next = $element->getNext();
+            if (!$next || $next->isBlock()) {
+                $markdown = '';
+            }
+        }
+
+        return $markdown;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('#text');
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/Element.php b/vendor/league/html-to-markdown/src/Element.php
new file mode 100644
index 000000000..e1e9d1a09
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Element.php
@@ -0,0 +1,257 @@
+<?php
+
+namespace League\HTMLToMarkdown;
+
+class Element implements ElementInterface
+{
+    /**
+     * @var \DOMNode
+     */
+    protected $node;
+
+    /**
+     * @var ElementInterface|null
+     */
+    private $nextCached;
+
+    public function __construct(\DOMNode $node)
+    {
+        $this->node = $node;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isBlock()
+    {
+        switch ($this->getTagName()) {
+            case 'blockquote':
+            case 'body':
+            case 'code':
+            case 'div':
+            case 'h1':
+            case 'h2':
+            case 'h3':
+            case 'h4':
+            case 'h5':
+            case 'h6':
+            case 'hr':
+            case 'html':
+            case 'li':
+            case 'p':
+            case 'ol':
+            case 'ul':
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * @return bool
+     */
+    public function isText()
+    {
+        return $this->getTagName() === '#text';
+    }
+
+    /**
+     * @return bool
+     */
+    public function isWhitespace()
+    {
+        return $this->getTagName() === '#text' && trim($this->getValue()) === '';
+    }
+
+    /**
+     * @return string
+     */
+    public function getTagName()
+    {
+        return $this->node->nodeName;
+    }
+
+    /**
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->node->nodeValue;
+    }
+
+    /**
+     * @return ElementInterface|null
+     */
+    public function getParent()
+    {
+        return new static($this->node->parentNode) ?: null;
+    }
+
+    /**
+     * @return bool
+     */
+    public function hasChildren()
+    {
+        return $this->node->hasChildNodes();
+    }
+
+    /**
+     * @return ElementInterface[]
+     */
+    public function getChildren()
+    {
+        $ret = array();
+        /** @var \DOMNode $node */
+        foreach ($this->node->childNodes as $node) {
+            $ret[] = new static($node);
+        }
+
+        return $ret;
+    }
+
+    /**
+     * @return ElementInterface|null
+     */
+    public function getNext()
+    {
+        if ($this->nextCached === null) {
+            $nextNode = $this->getNextNode($this->node);
+            if ($nextNode !== null) {
+                $this->nextCached = new static($nextNode);
+            }
+        }
+
+        return $this->nextCached;
+    }
+
+    /**
+     * @param \DomNode $node
+     * @param bool $checkChildren
+     *
+     * @return \DomNode|null
+     */
+    private function getNextNode($node, $checkChildren = true)
+    {
+        if ($checkChildren && $node->firstChild) {
+            return $node->firstChild;
+        }
+
+        if ($node->nextSibling) {
+            return $node->nextSibling;
+        }
+
+        if ($node->parentNode) {
+            return $this->getNextNode($node->parentNode, false);
+        }
+    }
+
+    /**
+     * @param string[]|string $tagNames
+     *
+     * @return bool
+     */
+    public function isDescendantOf($tagNames)
+    {
+        if (!is_array($tagNames)) {
+            $tagNames = array($tagNames);
+        }
+
+        for ($p = $this->node->parentNode; $p !== false; $p = $p->parentNode) {
+            if (is_null($p)) {
+                return false;
+            }
+
+            if (in_array($p->nodeName, $tagNames)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @param string $markdown
+     */
+    public function setFinalMarkdown($markdown)
+    {
+        $markdown_node = $this->node->ownerDocument->createTextNode($markdown);
+        $this->node->parentNode->replaceChild($markdown_node, $this->node);
+    }
+
+    /**
+     * @return string
+     */
+    public function getChildrenAsString()
+    {
+        return $this->node->C14N();
+    }
+
+    /**
+     * @return int
+     */
+    public function getSiblingPosition()
+    {
+        $position = 0;
+
+        // Loop through all nodes and find the given $node
+        foreach ($this->getParent()->getChildren() as $current_node) {
+            if (!$current_node->isWhitespace()) {
+                $position++;
+            }
+
+            // TODO: Need a less-buggy way of comparing these
+            // Perhaps we can somehow ensure that we always have the exact same object and use === instead?
+            if ($this->equals($current_node)) {
+                break;
+            }
+        }
+
+        return $position;
+    }
+
+    /**
+     * @return int
+     */
+    public function getListItemLevel()
+    {
+        $level = 0;
+        $parent = $this->getParent();
+
+        while ($parent !== null && $parent->node->parentNode) {
+            if ($parent->getTagName() === 'li') {
+                $level++;
+            }
+            $parent = $parent->getParent();
+        }
+
+        return $level;
+    }
+
+    /**
+     * @param string $name
+     *
+     * @return string
+     */
+    public function getAttribute($name)
+    {
+        if ($this->node instanceof \DOMElement) {
+            return $this->node->getAttribute($name);
+        }
+
+        return '';
+    }
+
+    /**
+     * @param ElementInterface $element
+     *
+     * @return bool
+     */
+    public function equals(ElementInterface $element)
+    {
+        if ($element instanceof self) {
+            return $element->node === $this->node;
+        }
+
+        return $element === $this;
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/ElementInterface.php b/vendor/league/html-to-markdown/src/ElementInterface.php
new file mode 100644
index 000000000..138ddf286
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/ElementInterface.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace League\HTMLToMarkdown;
+
+interface ElementInterface
+{
+    /**
+     * @return bool
+     */
+    public function isBlock();
+
+    /**
+     * @return bool
+     */
+    public function isText();
+
+    /**
+     * @return bool
+     */
+    public function isWhitespace();
+
+    /**
+     * @return string
+     */
+    public function getTagName();
+
+    /**
+     * @return string
+     */
+    public function getValue();
+
+    /**
+     * @return ElementInterface|null
+     */
+    public function getParent();
+
+    /**
+     * @param string|string[] $tagNames
+     *
+     * @return bool
+     */
+    public function isDescendantOf($tagNames);
+
+    /**
+     * @return bool
+     */
+    public function hasChildren();
+
+    /**
+     * @return ElementInterface[]
+     */
+    public function getChildren();
+
+    /**
+     * @return ElementInterface|null
+     */
+    public function getNext();
+
+    /**
+     * @return int
+     */
+    public function getSiblingPosition();
+
+    /**
+     * @return string
+     */
+    public function getChildrenAsString();
+
+    /**
+     * @param string $markdown
+     */
+    public function setFinalMarkdown($markdown);
+
+    /**
+     * @param string $name
+     *
+     * @return string
+     */
+    public function getAttribute($name);
+}
diff --git a/vendor/league/html-to-markdown/src/Environment.php b/vendor/league/html-to-markdown/src/Environment.php
new file mode 100644
index 000000000..560cfe613
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/Environment.php
@@ -0,0 +1,104 @@
+<?php
+
+namespace League\HTMLToMarkdown;
+
+use League\HTMLToMarkdown\Converter\BlockquoteConverter;
+use League\HTMLToMarkdown\Converter\CodeConverter;
+use League\HTMLToMarkdown\Converter\CommentConverter;
+use League\HTMLToMarkdown\Converter\ConverterInterface;
+use League\HTMLToMarkdown\Converter\DefaultConverter;
+use League\HTMLToMarkdown\Converter\DivConverter;
+use League\HTMLToMarkdown\Converter\EmphasisConverter;
+use League\HTMLToMarkdown\Converter\HardBreakConverter;
+use League\HTMLToMarkdown\Converter\HeaderConverter;
+use League\HTMLToMarkdown\Converter\HorizontalRuleConverter;
+use League\HTMLToMarkdown\Converter\ImageConverter;
+use League\HTMLToMarkdown\Converter\LinkConverter;
+use League\HTMLToMarkdown\Converter\ListBlockConverter;
+use League\HTMLToMarkdown\Converter\ListItemConverter;
+use League\HTMLToMarkdown\Converter\ParagraphConverter;
+use League\HTMLToMarkdown\Converter\PreformattedConverter;
+use League\HTMLToMarkdown\Converter\TextConverter;
+
+final class Environment
+{
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @var ConverterInterface[]
+     */
+    protected $converters = array();
+
+    public function __construct(array $config = array())
+    {
+        $this->config = new Configuration($config);
+        $this->addConverter(new DefaultConverter());
+    }
+
+    /**
+     * @return Configuration
+     */
+    public function getConfig()
+    {
+        return $this->config;
+    }
+
+    /**
+     * @param ConverterInterface $converter
+     */
+    public function addConverter(ConverterInterface $converter)
+    {
+        if ($converter instanceof ConfigurationAwareInterface) {
+            $converter->setConfig($this->config);
+        }
+
+        foreach ($converter->getSupportedTags() as $tag) {
+            $this->converters[$tag] = $converter;
+        }
+    }
+
+    /**
+     * @param string $tag
+     *
+     * @return ConverterInterface
+     */
+    public function getConverterByTag($tag)
+    {
+        if (isset($this->converters[$tag])) {
+            return $this->converters[$tag];
+        }
+
+        return $this->converters[DefaultConverter::DEFAULT_CONVERTER];
+    }
+
+    /**
+     * @param array $config
+     *
+     * @return Environment
+     */
+    public static function createDefaultEnvironment(array $config = array())
+    {
+        $environment = new static($config);
+
+        $environment->addConverter(new BlockquoteConverter());
+        $environment->addConverter(new CodeConverter());
+        $environment->addConverter(new CommentConverter());
+        $environment->addConverter(new DivConverter());
+        $environment->addConverter(new EmphasisConverter());
+        $environment->addConverter(new HardBreakConverter());
+        $environment->addConverter(new HeaderConverter());
+        $environment->addConverter(new HorizontalRuleConverter());
+        $environment->addConverter(new ImageConverter());
+        $environment->addConverter(new LinkConverter());
+        $environment->addConverter(new ListBlockConverter());
+        $environment->addConverter(new ListItemConverter());
+        $environment->addConverter(new ParagraphConverter());
+        $environment->addConverter(new PreformattedConverter());
+        $environment->addConverter(new TextConverter());
+
+        return $environment;
+    }
+}
diff --git a/vendor/league/html-to-markdown/src/HtmlConverter.php b/vendor/league/html-to-markdown/src/HtmlConverter.php
new file mode 100644
index 000000000..db3c29e1c
--- /dev/null
+++ b/vendor/league/html-to-markdown/src/HtmlConverter.php
@@ -0,0 +1,231 @@
+<?php
+
+namespace League\HTMLToMarkdown;
+
+/**
+ * Class HtmlConverter
+ *
+ * A helper class to convert HTML to Markdown.
+ *
+ * @author Colin O'Dell <colinodell@gmail.com>
+ * @author Nick Cernis <nick@cern.is>
+ *
+ * @link https://github.com/thephpleague/html-to-markdown/ Latest version on GitHub.
+ *
+ * @license http://www.opensource.org/licenses/mit-license.php MIT
+ */
+class HtmlConverter
+{
+    /**
+     * @var Environment
+     */
+    protected $environment;
+
+    /**
+     * Constructor
+     *
+     * @param Environment|array $options Environment object or configuration options
+     */
+    public function __construct($options = array())
+    {
+        if ($options instanceof Environment) {
+            $this->environment = $options;
+        } elseif (is_array($options)) {
+            $defaults = array(
+                'header_style' => 'setext', // Set to 'atx' to output H1 and H2 headers as # Header1 and ## Header2
+                'suppress_errors' => true, // Set to false to show warnings when loading malformed HTML
+                'strip_tags' => false, // Set to true to strip tags that don't have markdown equivalents. N.B. Strips tags, not their content. Useful to clean MS Word HTML output.
+                'bold_style' => '**', // Set to '__' if you prefer the underlined style
+                'italic_style' => '_', // Set to '*' if you prefer the asterisk style
+                'remove_nodes' => '', // space-separated list of dom nodes that should be removed. example: 'meta style script'
+                'hard_break' => false,// Set to true to turn <br> into `\n` instead of `  \n`
+            );
+
+            $this->environment = Environment::createDefaultEnvironment($defaults);
+
+            $this->environment->getConfig()->merge($options);
+        }
+    }
+
+    /**
+     * @return Environment
+     */
+    public function getEnvironment()
+    {
+        return $this->environment;
+    }
+
+    /**
+     * @return Configuration
+     */
+    public function getConfig()
+    {
+        return $this->environment->getConfig();
+    }
+
+    /**
+     * Convert
+     *
+     * @see HtmlConverter::convert
+     *
+     * @param string $html
+     *
+     * @return string The Markdown version of the html
+     */
+    public function __invoke($html)
+    {
+        return $this->convert($html);
+    }
+
+    /**
+     * Convert
+     *
+     * Loads HTML and passes to getMarkdown()
+     *
+     * @param string $html
+     *
+     * @throws \InvalidArgumentException
+     *
+     * @return string The Markdown version of the html
+     */
+    public function convert($html)
+    {
+        if (trim($html) === '') {
+            return '';
+        }
+
+        $document = $this->createDOMDocument($html);
+
+        // Work on the entire DOM tree (including head and body)
+        if (!($root = $document->getElementsByTagName('html')->item(0))) {
+            throw new \InvalidArgumentException('Invalid HTML was provided');
+        }
+
+        $rootElement = new Element($root);
+        $this->convertChildren($rootElement);
+
+        // Store the now-modified DOMDocument as a string
+        $markdown = $document->saveHTML();
+
+        return $this->sanitize($markdown);
+    }
+
+    /**
+     * @param string $html
+     *
+     * @return \DOMDocument
+     */
+    private function createDOMDocument($html)
+    {
+        $document = new \DOMDocument();
+
+        if ($this->getConfig()->getOption('suppress_errors')) {
+            // Suppress conversion errors (from http://bit.ly/pCCRSX)
+            libxml_use_internal_errors(true);
+        }
+
+        // Hack to load utf-8 HTML (from http://bit.ly/pVDyCt)
+        $document->loadHTML('<?xml encoding="UTF-8">' . $html);
+        $document->encoding = 'UTF-8';
+
+        if ($this->getConfig()->getOption('suppress_errors')) {
+            libxml_clear_errors();
+        }
+
+        return $document;
+    }
+
+    /**
+     * Convert Children
+     *
+     * Recursive function to drill into the DOM and convert each node into Markdown from the inside out.
+     *
+     * Finds children of each node and convert those to #text nodes containing their Markdown equivalent,
+     * starting with the innermost element and working up to the outermost element.
+     *
+     * @param ElementInterface $element
+     */
+    private function convertChildren(ElementInterface $element)
+    {
+        // Don't convert HTML code inside <code> and <pre> blocks to Markdown - that should stay as HTML
+        // except if the current node is a code tag, which needs to be converted by the CodeConverter.
+        if ($element->isDescendantOf(array('pre', 'code')) && $element->getTagName() !== 'code') {
+            return;
+        }
+
+        // If the node has children, convert those to Markdown first
+        if ($element->hasChildren()) {
+            foreach ($element->getChildren() as $child) {
+                $this->convertChildren($child);
+            }
+        }
+
+        // Now that child nodes have been converted, convert the original node
+        $markdown = $this->convertToMarkdown($element);
+
+        // Create a DOM text node containing the Markdown equivalent of the original node
+
+        // Replace the old $node e.g. '<h3>Title</h3>' with the new $markdown_node e.g. '### Title'
+        $element->setFinalMarkdown($markdown);
+    }
+
+    /**
+     * Convert to Markdown
+     *
+     * Converts an individual node into a #text node containing a string of its Markdown equivalent.
+     *
+     * Example: An <h3> node with text content of 'Title' becomes a text node with content of '### Title'
+     *
+     * @param ElementInterface $element
+     *
+     * @return string The converted HTML as Markdown
+     */
+    protected function convertToMarkdown(ElementInterface $element)
+    {
+        $tag = $element->getTagName();
+
+        // Strip nodes named in remove_nodes
+        $tags_to_remove = explode(' ', $this->getConfig()->getOption('remove_nodes'));
+        if (in_array($tag, $tags_to_remove)) {
+            return false;
+        }
+
+        $converter = $this->environment->getConverterByTag($tag);
+
+        return $converter->convert($element);
+    }
+
+    /**
+     * @param string $markdown
+     *
+     * @return string
+     */
+    protected function sanitize($markdown)
+    {
+        $markdown = html_entity_decode($markdown, ENT_QUOTES, 'UTF-8');
+        $markdown = preg_replace('/<!DOCTYPE [^>]+>/', '', $markdown); // Strip doctype declaration
+        $markdown = trim($markdown); // Remove blank spaces at the beggining of the html
+
+        /*
+         * Removing unwanted tags. Tags should be added to the array in the order they are expected.
+         * XML, html and body opening tags should be in that order. Same case with closing tags
+         */
+        $unwanted = array('<?xml encoding="UTF-8">', '<html>', '</html>', '<body>', '</body>', '<head>', '</head>', '&#xD;');
+
+        foreach ($unwanted as $tag) {
+            if (strpos($tag, '/') === false) {
+                // Opening tags
+                if (strpos($markdown, $tag) === 0) {
+                    $markdown = substr($markdown, strlen($tag));
+                }
+            } else {
+                // Closing tags
+                if (strpos($markdown, $tag) === strlen($markdown) - strlen($tag)) {
+                    $markdown = substr($markdown, 0, -strlen($tag));
+                }
+            }
+        }
+
+        return trim($markdown, "\n\r\0\x0B");
+    }
+}