Markdown Test Case

composer.json

{
    "name": "fiddlerwoaroof/markdown_case",
    "require": {
        "league/commonmark": "^0.13.0"
    },
    "authors": [
        {
            "name": "fiddlerwoaroof",
            "email": "fiddlerwoaroof@gmail.com"
        }
    ],
    "minimum-stability": "dev"
}

composer.lock

{
    "_readme": [
        "This file locks the dependencies of your project to a known state",
        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
        "This file is @generated automatically"
    ],
    "hash": "37a2e934f1fcd85aa7f0f369c5b02bd3",
    "content-hash": "ea91e5f62f3e99ff92dd96ba15db5a17",
    "packages": [
        {
            "name": "league/commonmark",
            "version": "0.13.0",
            "source": {
                "type": "git",
                "url": "https://github.com/thephpleague/commonmark.git",
                "reference": "a4e93bc4fd1a8ff8f534040c4a07371ea5f4b484"
            },
            "dist": {
                "type": "zip",
                "url": "https://api.github.com/repos/thephpleague/commonmark/zipball/a4e93bc4fd1a8ff8f534040c4a07371ea5f4b484",
                "reference": "a4e93bc4fd1a8ff8f534040c4a07371ea5f4b484",
                "shasum": ""
            },
            "require": {
                "ext-mbstring": "*",
                "php": ">=5.4.8"
            },
            "replace": {
                "colinodell/commonmark-php": "*"
            },
            "require-dev": {
                "erusev/parsedown": "~1.0",
                "jgm/commonmark": "0.24",
                "michelf/php-markdown": "~1.4",
                "mikehaertl/php-shellcommand": "~1.1.0",
                "phpunit/phpunit": "~4.3|~5.0",
                "scrutinizer/ocular": "^1.1",
                "symfony/finder": "~2.3"
            },
            "suggest": {
                "league/commonmark-extras": "Library of useful extensions including smart punctuation"
            },
            "bin": [
                "bin/commonmark"
            ],
            "type": "library",
            "extra": {
                "branch-alias": {
                    "dev-master": "0.14-dev"
                }
            },
            "autoload": {
                "psr-4": {
                    "League\\CommonMark\\": "src/"
                }
            },
            "notification-url": "https://packagist.org/downloads/",
            "license": [
                "BSD-3-Clause"
            ],
            "authors": [
                {
                    "name": "Colin O'Dell",
                    "email": "colinodell@gmail.com",
                    "homepage": "http://www.colinodell.com",
                    "role": "Lead Developer"
                }
            ],
            "description": "Markdown parser for PHP based on the CommonMark spec",
            "homepage": "https://github.com/thephpleague/commonmark",
            "keywords": [
                "commonmark",
                "markdown",
                "parser"
            ],
            "time": "2016-01-14 04:29:54"
        }
    ],
    "packages-dev": [],
    "aliases": [],
    "minimum-stability": "dev",
    "stability-flags": [],
    "prefer-stable": false,
    "prefer-lowest": false,
    "platform": [],
    "platform-dev": []
}

output.log

% php test.php
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Block\Element\Document
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Block\Element\Paragraph
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Text
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Emphasis
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Text
<p>some text <em>new</em> some more text <em>hi there again</em></p>

% php test.php
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Block\Element\Document
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Block\Element\Paragraph
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Text
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Emphasis
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Text
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Emphasis
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Text
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Emphasis
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Text
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Inline\Element\Emphasis
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Block\Element\Paragraph
Event: League\CommonMark\Node\NodeWalkerEvent Node: League\CommonMark\Block\Element\Document
<p>some text <em>hi there</em> some more text <em>hi there again</em></p>

test.php

<?php
require_once __DIR__ . '/vendor/autoload.php';

use \League\CommonMark\DocParser;
use \League\CommonMark\Environment;
use \League\CommonMark\HtmlRenderer;
use \League\CommonMark\Inline\Element\Emphasis;
use \League\CommonMark\Inline\Element\Text;
use \League\Uri\Schemes\Http as HTTPUri;

$markdown = "some text *hi there* some more text *hi there again*";

$environment = Environment::createCommonMarkEnvironment();

$parser = new DocParser($environment);
$htmlRenderer = new HtmlRenderer($environment);

$ast = $parser->parse($markdown);

$walker = $ast->walker();

while ($event = $walker->next()) {
  $node = $event->getNode();
  $eventClass = get_class($event);
  $nodeClass = get_class($node);
  echo "Event: $eventClass Node: $nodeClass\n";

  if ($node instanceof Emphasis) {
    /// This line causes an early exit:
    $newNode = new Text("new");
    $node->firstChild()->replaceWith($newNode);
    $walker->resumeAt($newNode, $entering=true);
  }
}

echo $htmlRenderer->renderBlock($ast)."\n";