Fix up tag flags

Gemfile.lock

@@ -31,6 +31,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-22
+  arm64-darwin-23
   x86_64-linux
 
 DEPENDENCIES

lib/syntax_tree/haml/format.rb

@@ -16,7 +16,9 @@ def initialize(
             .lines
             .each
             .with_index(1) do |line, index|
-              @literal_lines[index] = line.strip if line.lstrip.start_with?("!")
+              if (literal_line = line[/\A\s*(?:%[a-z]+)?(!.*)\s*\z/, 1])
+                @literal_lines[index] = literal_line
+              end
             end
 
           super(source, *rest, options: options)
@@ -384,8 +386,12 @@ def visit_tag(node)
               # tag.
               q.breakable_empty
 
-              if node.value[:parse]
-                format_tag_value(q, value)
+              if line = q.literal_lines[node.line]
+                q.text(line)
+              elsif node.value[:parse]
+                prefix = node.value[:preserve_script] ? "~" : "="
+                prefix = "&#{prefix}" if node.value[:escape_html]
+                format_tag_value(q, prefix, value)
               else
                 q.if_break { q.text("") }.if_flat { q.text(" ") }
                 q.text(value)
@@ -399,10 +405,10 @@ def visit_tag(node)
 
       private
 
-      def format_tag_value(q, value)
+      def format_tag_value(q, prefix, value)
         program = SyntaxTree.parse(value)
         if !program || program.statements.body.length > 1
-          return q.text("= #{value}")
+          return q.text("#{prefix} #{value}")
         end
 
         statement = program.statements.body.first
@@ -418,10 +424,10 @@ def format_tag_value(q, value)
           q.if_break { q.text("") }.if_flat { q.text(" ") }
           q.text(formatted[1...-1].gsub(/\\"/, "\""))
         else
-          q.text("= #{formatted}")
+          q.text("#{prefix} #{formatted}")
         end
       rescue Parser::ParseError
-        q.text("= #{value}")
+        q.text("#{prefix} #{value}")
       end
 
       # When printing out sequences of silent scripts, sometimes subsequent nodes

test/tag_test.rb

@@ -135,4 +135,20 @@ def test_interpolation_in_strings
   def test_interpolation_in_value
     assert_format("%p <small>hello</small>\"\#{1 + 2} little pigs\"")
   end
+
+  def test_preserve
+    assert_format("%p~ foo")
+  end
+
+  def test_escape_html
+    assert_format("%p&= foo")
+  end
+
+  def test_preserve_escape_html
+    assert_format("%p&~ foo")
+  end
+
+  def test_unescape
+    assert_format("%p!= foo")
+  end
 end