Allow Remarkup tables to have leading space so they work correctly with quoting

Summary: Fixes T10570.

Test Plan: {F1172098}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10570

Differential Revision: https://secure.phabricator.com/D15466

Author: epriestley

src/markup/engine/__tests__/remarkup/simple-table-with-leading-space.txt

@@ -0,0 +1,7 @@
+ |a|b|
+~~~~~~~~~~
+<div class="remarkup-table-wrap"><table class="remarkup-table">
+<tr><td>a</td><td>b</td></tr>
+</table></div>
+~~~~~~~~~~
+| a | b |

src/markup/engine/__tests__/remarkup/table-with-leading-space.txt

@@ -0,0 +1,7 @@
+ <table><tr><td>cell</td></tr></table>
+~~~~~~~~~~
+<div class="remarkup-table-wrap"><table class="remarkup-table">
+<tr><td>cell</td></tr>
+</table></div>
+~~~~~~~~~~
+| cell |

src/markup/engine/remarkup/blockrule/PhutilRemarkupSimpleTableBlockRule.php

@@ -5,7 +5,7 @@ final class PhutilRemarkupSimpleTableBlockRule extends PhutilRemarkupBlockRule {
   public function getMatchingLineCount(array $lines, $cursor) {
     $num_lines = 0;
     while (isset($lines[$cursor])) {
-      if (preg_match('/^(\|.*+\n?)+$/', $lines[$cursor])) {
+      if (preg_match('/^(\s*\|.*+\n?)+$/', $lines[$cursor])) {
         $num_lines++;
         $cursor++;
       } else {

src/markup/engine/remarkup/blockrule/PhutilRemarkupTableBlockRule.php

@@ -5,7 +5,7 @@ final class PhutilRemarkupTableBlockRule extends PhutilRemarkupBlockRule {
   public function getMatchingLineCount(array $lines, $cursor) {
     $num_lines = 0;
 
-    if (preg_match('/^<table>/i', $lines[$cursor])) {
+    if (preg_match('/^\s*<table>/i', $lines[$cursor])) {
       $num_lines++;
       $cursor++;
 
@@ -24,7 +24,7 @@ public function getMatchingLineCount(array $lines, $cursor) {
   public function markupText($text, $children) {
     $matches = array();
 
-    if (!preg_match('@^<table>(.*)</table>$@si', $text, $matches)) {
+    if (!preg_match('@^\s*<table>(.*)</table>$@si', $text, $matches)) {
       return $this->fail(
         $text,
         pht('Bad table (expected %s)', '<table>...</table>'));