Add &= and != to SpaceBeforeScript

lib/haml_lint/linter/space_before_script.rb

@@ -41,18 +41,23 @@ def visit_tag(node) # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplex
     def visit_script(node)
       # Plain text nodes with interpolation are converted to script nodes, so we
       # need to ignore them here.
-      return unless document.source_lines[node.line - 1].lstrip.start_with?('=')
-      record_lint(node, MESSAGE_FORMAT % '=') if missing_space?(node)
+      line = document.source_lines[node.line - 1].lstrip
+      return unless line.start_with?('=', '&=', '!=')
+      text = if line.start_with?('=')
+               node.script
+             else
+               line[/=(.*)/, 1]
+             end
+      record_lint(node, MESSAGE_FORMAT % line[/[&!]?=/]) if missing_space?(text)
     end
 
     def visit_silent_script(node)
-      record_lint(node, MESSAGE_FORMAT % '-') if missing_space?(node)
+      record_lint(node, MESSAGE_FORMAT % '-') if missing_space?(node.script)
     end
 
     private
 
-    def missing_space?(node)
-      text = node.script
+    def missing_space?(text)
       !ALLOWED_SEPARATORS.include?(text[0]) if text
     end
   end

lib/haml_lint/tree/script_node.rb

@@ -10,7 +10,7 @@ def parsed_script
       HamlLint::ParsedRuby.new(HamlLint::RubyParser.new.parse(script))
     end
 
-    # Returns the source for the script following the `-` marker.
+    # Returns the source for the script following the `=` marker.
     #
     # @return [String]
     def script

spec/haml_lint/linter/space_before_script_spec.rb

@@ -33,6 +33,67 @@
     it { should report_lint line: 2 }
   end
 
+  context 'when unsafe script has separating space' do
+    let(:haml) { <<-HAML }
+      %span Hello
+      != some_code
+      %span World
+    HAML
+
+    it { should_not report_lint }
+
+    context 'and nested' do
+      let(:haml) { <<-HAML }
+        %span Hello
+        %span
+          != some_code
+        %span World
+      HAML
+
+      it { should_not report_lint }
+    end
+  end
+
+  context 'when unsafe script has no separating space' do
+    let(:haml) { <<-HAML }
+      %span Hello
+      !=some_code
+      %span World
+    HAML
+
+    it { should report_lint line: 2 }
+
+    context 'and inline' do
+      let(:haml) { <<-HAML }
+        %span Hello
+        %span!=some_code
+        %span World
+      HAML
+
+      it { should report_lint line: 2 }
+    end
+  end
+
+  context 'when escaping script has no separating space' do
+    let(:haml) { <<-HAML }
+      %span Hello
+      &=some_code
+      %span World
+    HAML
+
+    it { should report_lint line: 2 }
+
+    context 'and inline' do
+      let(:haml) { <<-HAML }
+        %span Hello
+        %span&=some_code
+        %span World
+      HAML
+
+      it { should report_lint line: 2 }
+    end
+  end
+
   context 'when script has a separating space' do
     let(:haml) { <<-HAML }
       %span Hello