Initial commit with PSR-4 autoloading and phpunit

.gitignore

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+vendor
+.phpunit.result.cache

composer.json

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+{
+    "autoload":{
+        "psr-4": {
+            "LogseqGem\\": "src"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": { 
+            "LogseqGem\\Tests\\": "tests"
+        }
+    },
+    "require": {
+        "league/commonmark": "^2.3"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.5"
+    }
+}

phpunit.xml

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+<phpunit bootstrap="vendor/autoload.php">
+  <testsuites>
+    <testsuite name="parser">
+      <file>tests/ParserTest.php</file>
+    </testsuite>
+  </testsuites>
+</phpunit>

run.php

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+<?php
+
+declare(strict_types=1);
+
+require __DIR__ . '/vendor/autoload.php';
+
+$parser = new LogseqGem\Parser;
+
+$page = file_get_contents("/Users/annika/sync/BTSync/logseq/pages/Gemlog.md");
+$page = file_get_contents("/Users/annika/sync/BTSync/logseq/pages/Publishing to the Gemlog with logseq.md");
+
+$document = $parser->parse($page);
+foreach ($document->iterator() as $node) {
+    echo 'Current node: ' . get_class($node) . "\n";
+}

src/Parser.php

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+<?php
+
+declare(strict_types=1);
+
+namespace LogseqGem;
+
+use League\CommonMark\Parser\MarkdownParser;
+use League\CommonMark\Environment\Environment;
+use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
+
+abstract class Parser {
+    private MarkdownParser $parser;
+
+    public function __construct() {
+        $environment = new Environment();
+        $environment->addExtension(new CommonMarkCoreExtension());
+        $this->parser = new MarkdownParser($environment);
+    }
+
+    public function parse(string $input) {
+        return $this->parser->parse($input);
+    }
+}

tests/ParserTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace LogseqGem\Tests;
+
+use PHPUnit\Framework\TestCase;
+use LogseqGem\Parser;
+
+use League\CommonMark\Node\Block\Document;
+
+class ParserTest extends TestCase {
+    public function testParse() {
+        $parser = $this->getMockForAbstractClass(Parser::class);
+        $document = $parser->parse('**foo**');
+        $this->assertInstanceOf(Document::class, $document);
+    }
+}