Implement BlockQuote

src/Components/Blocks/BlockQuote.php

@@ -0,0 +1,113 @@
+<?php
+
+namespace Erusev\Parsedown\Components\Blocks;
+
+use Erusev\Parsedown\AST\Handler;
+use Erusev\Parsedown\AST\StateRenderable;
+use Erusev\Parsedown\Components\Block;
+use Erusev\Parsedown\Components\ContinuableBlock;
+use Erusev\Parsedown\Html\Renderables\Element;
+use Erusev\Parsedown\Parsedown;
+use Erusev\Parsedown\Parsing\Context;
+use Erusev\Parsedown\Parsing\Line;
+use Erusev\Parsedown\Parsing\Lines;
+use Erusev\Parsedown\State;
+
+final class BlockQuote implements ContinuableBlock
+{
+    use ContinuableBlockDefaultInterrupt, BlockAcquisition;
+
+    /** @var Lines */
+    private $Lines;
+
+    /**
+     * @param Lines $Lines
+     */
+    public function __construct($Lines)
+    {
+        $this->Lines = $Lines;
+    }
+
+    /**
+     * @param Context $Context
+     * @param Block|null $Block
+     * @param State|null $State
+     * @return static|null
+     */
+    public static function build(
+        Context $Context,
+        Block $Block = null,
+        State $State = null
+    ) {
+        if (\preg_match('/^(>[ \t]?+)(.*+)/', $Context->line()->text(), $matches)) {
+            $indentOffset = $Context->line()->indentOffset() + $Context->line()->indent() + \strlen($matches[1]);
+
+            $recoveredSpaces = 0;
+            if (\strlen($matches[1]) === 2 && \substr($matches[1], 1, 1) === "\t") {
+                $recoveredSpaces = Line::tabShortage(2, $Context->line()->indentOffset() + $Context->line()->indent());
+            }
+
+            return new self(
+                Lines::fromTextLines(
+                \str_repeat(' ', $recoveredSpaces) . $matches[2],
+                $indentOffset
+            )
+            );
+        }
+
+        return null;
+    }
+
+    /**
+     * @param Context $Context
+     * @return self|null
+     */
+    public function continue(Context $Context)
+    {
+        if ($this->interrupted) {
+            return null;
+        }
+
+        if ($Context->line()->text()[0] === '>' and \preg_match('/^(>[ \t]?+)(.*+)/', $Context->line()->text(), $matches)) {
+            $indentOffset = $Context->line()->indentOffset() + $Context->line()->indent() + \strlen($matches[1]);
+
+            $recoveredSpaces = 0;
+            if (\strlen($matches[1]) === 2 && \substr($matches[1], 1, 1) === "\t") {
+                $recoveredSpaces = Line::tabShortage(2, $Context->line()->indentOffset() + $Context->line()->indent());
+            }
+
+            $Lines = $this->Lines->appendingTextLines(
+                \str_repeat(' ', $recoveredSpaces) . $matches[2],
+                $indentOffset
+            );
+
+            return new self($Lines);
+        }
+
+        if (! $Context->previousEmptyLines() > 0) {
+            $indentOffset = $Context->line()->indentOffset() + $Context->line()->indent();
+            $Lines = $this->Lines->appendingTextLines($Context->line()->text(), $indentOffset);
+
+            return new self($Lines);
+        }
+
+        return null;
+    }
+
+    /**
+     * @return Handler<Element>
+     */
+    public function stateRenderable(Parsedown $Parsedown)
+    {
+        return new Handler(
+            /** @return Element */
+            function (State $State) use ($Parsedown) {
+                return new Element(
+                    'blockquote',
+                    [],
+                    $State->applyTo($Parsedown->lines($this->Lines))
+                );
+            }
+        );
+    }
+}