From 7cf114e6d8a658abd1fdafbd206d2122bbaed7d1 Mon Sep 17 00:00:00 2001
From: Zach Ahn <engineering@zachahn.com>
Date: Thu, 29 Feb 2024 10:53:58 -0500
Subject: [PATCH] Import CSS parsing pattern from PHP Textile

I copied the Regex patterns from PHP-Textile, with minor changes only
as necessary.

See original sources:

<https://github.com/textile/php-textile/blob/29e5a138df/test/fixtures/issue-224.yaml>

<https://github.com/textile/php-textile/blob/6ec7449755/src/Netcarver/Textile/Parser.php#L2533>

<https://github.com/textile/php-textile/blob/6ec7449755/src/Netcarver/Textile/Parser.php#L2540>
---
 src/block.rs                  | 10 +++++++---
 tests/fixtures/issue-224.yaml | 10 ++++++++++
 tests/test_yaml_fixtures.rs   |  1 +
 3 files changed, 18 insertions(+), 3 deletions(-)
 create mode 100644 tests/fixtures/issue-224.yaml

diff --git a/src/block.rs b/src/block.rs
index 3e4d568..080ff77 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -30,7 +30,7 @@ impl BlockHtmlAttributes {
     {
         lazy_static! {
             static ref CSS_CLASS_NAME_RE: Regex = fregex!(
-                r"(?i)^-?[_a-z][_a-z0-9-]*$");
+                r"^([-a-zA-Z 0-9_\/\[\].:!#]+)$");
         }
         let trimmed_name = name.as_ref().trim();
         if CSS_CLASS_NAME_RE.is_match(trimmed_name).unwrap_or_default() {
@@ -110,7 +110,7 @@ impl BlockAttributes {
             static ref ATTR_PADDING_LEFT_RE: Regex = fregex!(r"([(]+)");
             static ref ATTR_PADDING_RIGHT_RE: Regex = fregex!(r"([)]+)");
             static ref ATTR_COL_RE: Regex = fregex!(r"^(?:\\(\d+)\.?)?\s*(\d+)?");
-            static ref CSS_CLASSES_RE: Regex = fregex!(r"^([-a-zA-Z 0-9_\.\/\[\]]*)$");
+            static ref CSS_CLASSES_RE: Regex = fregex!(r"^([-a-zA-Z 0-9_\.\/\[\]:!]*)$");
         }
         let mut style = Vec::<String>::new();
 
@@ -460,7 +460,11 @@ mod test {
         assert_eq!(atts.to_string(), " class=\"align-left\" id=\"id-value&amp;data\"");
         assert!(atts.insert_css_class("otherclass"));
         assert_eq!(atts.to_string(), " class=\"align-left otherclass\" id=\"id-value&amp;data\"");
-        assert!(!atts.insert_css_class("invalid/class/name"));
+        assert!(!atts.insert_css_class("invalid@class@name"));
         assert_eq!(atts.to_string(), " class=\"align-left otherclass\" id=\"id-value&amp;data\"");
+        assert!(atts.insert_css_class("md:mt-3"));
+        assert_eq!(atts.to_string(), " class=\"align-left otherclass md:mt-3\" id=\"id-value&amp;data\"");
+        assert!(atts.insert_css_class("!mt-3"));
+        assert_eq!(atts.to_string(), " class=\"align-left otherclass md:mt-3 !mt-3\" id=\"id-value&amp;data\"");
     }
 }
diff --git a/tests/fixtures/issue-224.yaml b/tests/fixtures/issue-224.yaml
new file mode 100644
index 0000000..7b00dec
--- /dev/null
+++ b/tests/fixtures/issue-224.yaml
@@ -0,0 +1,10 @@
+Support exclamation marks and colons in class names:
+  input: |
+    p(md:mt-3). Paragraph
+
+    p(!mt-3). Paragraph
+
+  expect: |
+    <p class="md:mt-3">Paragraph</p>
+
+    <p class="!mt-3">Paragraph</p>
diff --git a/tests/test_yaml_fixtures.rs b/tests/test_yaml_fixtures.rs
index 6d90a71..ffed63c 100644
--- a/tests/test_yaml_fixtures.rs
+++ b/tests/test_yaml_fixtures.rs
@@ -184,5 +184,6 @@ fn test_yaml_fixtures() {
         "issue-189",
         "issue-198",
         "issue-202",
+        "issue-224",
     ]);
 }