feat: add block element parser

src/BlockElementParser.php

@@ -0,0 +1,123 @@
+<?php
+
+/*
+ * This file is part of the HTMLUP package.
+ *
+ * (c) Jitendra Adhikari <jiten.adhikary@gmail.com>
+ *     <https://github.com/adhocore>
+ *
+ * Licensed under MIT license.
+ */
+
+namespace Ahc;
+
+abstract class BlockElementParser
+{
+    use HtmlHelper;
+
+    const RE_MD_QUOTE  = '~^\s*(>+)\s+~';
+    const RE_RAW       = '/^<\/?\w.*?\/?>/';
+    const RE_MD_SETEXT = '~^\s*(={3,}|-{3,})\s*$~';
+    const RE_MD_CODE   = '/^```\s*([\w-]+)?/';
+    const RE_MD_RULE   = '~^(_{3,}|\*{3,}|\-{3,})$~';
+    const RE_MD_TCOL   = '~(\|\s*\:)?\s*\-{3,}\s*(\:\s*\|)?~';
+    const RE_MD_OL     = '/^\d+\. /';
+
+    protected $lines       = [];
+    protected $stackList   = [];
+    protected $stackBlock  = [];
+    protected $stackTable  = [];
+
+    protected $pointer     = -1;
+    protected $listLevel   = 0;
+    protected $quoteLevel  = 0;
+    protected $indent      = 0;
+    protected $nextIndent  = 0;
+    protected $indentLen   = 4;
+
+    protected $indentStr       = '    ';
+    protected $line            = '';
+    protected $trimmedLine     = '';
+    protected $prevLine        = '';
+    protected $trimmedPrevLine = '';
+    protected $nextLine        = '';
+    protected $trimmedNextLine = '';
+    protected $markup          = '';
+
+    protected $inList  = \false;
+    protected $inQuote = \false;
+    protected $inPara  = \false;
+    protected $inHtml  = \false;
+    protected $inTable = \false;
+
+    public function codeInternal($codeBlock)
+    {
+        while (isset($this->lines[$this->pointer + 1])) {
+            $this->line = $this->escape($this->lines[$this->pointer + 1]);
+
+            if (($codeBlock && \substr(\ltrim($this->line), 0, 3) !== '```')
+                || \strpos($this->line, $this->indentStr) === 0
+            ) {
+                $this->markup .= "\n"; // @todo: donot use \n for first line
+                $this->markup .= $codeBlock ? $this->line : \substr($this->line, $this->indentLen);
+
+                $this->pointer++;
+            } else {
+                break;
+            }
+        }
+    }
+
+    protected function listInternal()
+    {
+        $isUl = \in_array(\substr($this->trimmedNextLine, 0, 2), ['- ', '* ', '+ ']);
+
+        if ($isUl || \preg_match(static::RE_MD_OL, $this->trimmedNextLine)) {
+            $wrapper = $isUl ? 'ul' : 'ol';
+            if ($this->nextIndent > $this->indent) {
+                $this->stackList[] = "</li>\n";
+                $this->stackList[] = "</$wrapper>";
+                $this->markup .= "\n<$wrapper>\n";
+
+                $this->listLevel++;
+            } else {
+                $this->markup .= "</li>\n";
+            }
+
+            if ($this->nextIndent < $this->indent) {
+                $shift = \intval(($this->indent - $this->nextIndent) / $this->indentLen);
+
+                while ($shift--) {
+                    $this->markup .= \array_pop($this->stackList);
+
+                    if ($this->listLevel > 2) {
+                        $this->markup .= \array_pop($this->stackList);
+                    }
+                }
+            }
+        } else {
+            $this->markup .= "</li>\n";
+        }
+    }
+
+    protected function tableInternal($headerCount)
+    {
+        $columnCount = \preg_match_all(static::RE_MD_TCOL, \trim($this->trimmedNextLine, '|'));
+
+        if ($headerCount > 0 && $headerCount <= $columnCount) {
+            $this->pointer++;
+
+            $this->inTable = \true;
+            $this->markup .= "<table>\n<thead>\n<tr>\n";
+            $this->trimmedLine = \trim($this->trimmedLine, '|');
+
+            foreach (\explode('|', $this->trimmedLine) as $hdr) {
+                $this->markup .= '<th>' . \trim($hdr) . "</th>\n";
+            }
+
+            $this->markup .= "</tr>\n</thead>\n<tbody>\n";
+
+            return \true;
+        }
+    }
+}