1 files changed, 84 insertions, 0 deletions
diff --git a/haml_lint/linter/no_plain_nodes.rb b/haml_lint/linter/no_plain_nodes.rb
new file mode 100644
index 00000000000..c39f61fa80d
--- /dev/null
+++ b/haml_lint/linter/no_plain_nodes.rb
@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require 'active_support/core_ext/array/grouping'
+
+module HamlLint
+  class Linter
+    class NoPlainNodes < Linter
+      include ::HamlLint::LinterRegistry
+
+      def visit_tag(node)
+        if inline_plain_node?(node)
+          check_inline(node)
+        elsif !node.script.empty?
+          check_script(node)
+        else
+          check(node)
+        end
+      end
+
+      private
+
+      def check(node)
+        text_in_node(node).each { |string| record(node, string) }
+      end
+
+      def check_inline(node)
+        text = inline_text(node)
+        record(node, text) unless text.empty?
+      end
+
+      def check_script(node)
+        text = inline_text(node)
+        record(node, text) unless text.start_with?('=') || text.empty?
+      end
+
+      # Build an array of all strings in child text nodes.
+      # non text nodes are nil, where we'll split the sentences.
+      def text_in_node(node)
+        texts = node.children.map do |child|
+          child.text.strip if text_node?(child)
+        end
+
+        texts.split(nil).map { |sentence| sentence.join(' ') unless sentence.empty? }.compact
+      end
+
+      # Removes a node's attributes and tag from the source code,
+      # returning the inline text of a node.
+      def inline_text(node)
+        text = node.source_code.gsub("%#{node.tag_name}", '')
+
+        attributes = node.attributes_source.map(&:last)
+        attributes.each { |attribute| text = text.gsub(attribute, '') }
+
+        text.strip
+      end
+
+      def record(node, string)
+        record_lint(node, message(string))
+      end
+
+      def message(string)
+        "`#{string}` is a plain node. Please use an i18n method like `#{fixed(string)}`"
+      end
+
+      def fixed(string)
+        "= _('#{string}')"
+      end
+
+      def inline_plain_node?(node)
+        node.children.empty? && node.script.empty?
+      end
+
+      def plain_node?(node)
+        node.is_a?(::HamlLint::Tree::PlainNode)
+      end
+
+      def text_node?(node)
+        return false unless plain_node?(node)
+
+        !node.text.empty?
+      end
+    end
+  end
+end