Propagate header cell alignment to column when no separator row

When using |=< |=> |=~ alignment markers on header cells, the alignment
now applies to the entire column (subsequent data rows), not just the
header cell itself.

Separator row alignment still takes precedence if present.

Author: dereuromark

src/Parser/BlockParser.php

@@ -2246,15 +2246,25 @@ protected function tryParseTable(Node $parent, array $lines, int $start): ?int
                     $trimmed = substr($trimmed, 1); // Remove =
 
                     // Check for alignment marker after =
+                    // This sets column alignment if no separator row defined it
                     if (str_starts_with($trimmed, '<')) {
                         $cellAlignment = TableCell::ALIGN_LEFT;
                         $trimmed = substr($trimmed, 1);
+                        if (!isset($alignments[$index])) {
+                            $alignments[$index] = TableCell::ALIGN_LEFT;
+                        }
                     } elseif (str_starts_with($trimmed, '>')) {
                         $cellAlignment = TableCell::ALIGN_RIGHT;
                         $trimmed = substr($trimmed, 1);
+                        if (!isset($alignments[$index])) {
+                            $alignments[$index] = TableCell::ALIGN_RIGHT;
+                        }
                     } elseif (str_starts_with($trimmed, '~')) {
                         $cellAlignment = TableCell::ALIGN_CENTER;
                         $trimmed = substr($trimmed, 1);
+                        if (!isset($alignments[$index])) {
+                            $alignments[$index] = TableCell::ALIGN_CENTER;
+                        }
                     }
 
                     $cellContent = $trimmed;

tests/TestCase/Parser/BlockParserTest.php

@@ -284,6 +284,51 @@ public function testParseTableWithEqualsHeaderNoSeparatorNeeded(): void
         $this->assertFalse($rows[2]->isHeader());
     }
 
+    public function testParseTableWithEqualsHeaderAlignmentPropagates(): void
+    {
+        // Header alignment should propagate to data cells when no separator row
+        $doc = $this->parser->parse("|=> Right |=< Left |=~ Center |\n| A | B | C |\n| D | E | F |");
+
+        $table = $doc->getChildren()[0];
+        $rows = $table->getChildren();
+
+        // Header row alignments
+        $headerCells = $rows[0]->getChildren();
+        $this->assertSame(TableCell::ALIGN_RIGHT, $headerCells[0]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_LEFT, $headerCells[1]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_CENTER, $headerCells[2]->getAlignment());
+
+        // Data rows should inherit column alignment from header
+        $dataCells1 = $rows[1]->getChildren();
+        $this->assertSame(TableCell::ALIGN_RIGHT, $dataCells1[0]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_LEFT, $dataCells1[1]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_CENTER, $dataCells1[2]->getAlignment());
+
+        $dataCells2 = $rows[2]->getChildren();
+        $this->assertSame(TableCell::ALIGN_RIGHT, $dataCells2[0]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_LEFT, $dataCells2[1]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_CENTER, $dataCells2[2]->getAlignment());
+    }
+
+    public function testParseTableSeparatorRowOverridesHeaderAlignment(): void
+    {
+        // Separator row alignment takes precedence over header |= alignment
+        $doc = $this->parser->parse("|=> Right |=< Left |\n|:--------|------:|\n| A | B |");
+
+        $table = $doc->getChildren()[0];
+        $rows = $table->getChildren();
+
+        // Header cells get alignment from separator row, not from |= markers
+        $headerCells = $rows[0]->getChildren();
+        $this->assertSame(TableCell::ALIGN_LEFT, $headerCells[0]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_RIGHT, $headerCells[1]->getAlignment());
+
+        // Data row also uses separator row alignment
+        $dataCells = $rows[1]->getChildren();
+        $this->assertSame(TableCell::ALIGN_LEFT, $dataCells[0]->getAlignment());
+        $this->assertSame(TableCell::ALIGN_RIGHT, $dataCells[1]->getAlignment());
+    }
+
     public function testParseBlockAttributes(): void
     {
         $doc = $this->parser->parse("{.highlight}\n# Heading");