Experimental multi line implementation

hamilton.gemspec

@@ -30,4 +30,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec", ">= 3"
   spec.add_development_dependency "slim"
   spec.add_development_dependency "tenjin"
+  spec.add_development_dependency "unindent"
 end

lib/hamilton/parser.rb

@@ -5,24 +5,45 @@ module Hamilton
     def initialize(options = {})
       super
       @template_ast = [:multi]
+      @stack        = []
+      @prev_indent  = 0
     end
 
     def call(template)
       template.each_line do |line|
-        @template_ast << parse_line(line)
+        scanner = StringScanner.new(line)
+        @indent = parse_indent(scanner)
+
+        ast = parse_line(scanner)
+        @stack.push(ast) if ast
+
+        @prev_indent = @indent
       end
+
+      ast = compile_stack
+      @template_ast << ast if ast
+
       @template_ast
     end
 
     private
 
-    def parse_line(line)
-      scanner = StringScanner.new(line)
+    def parse_indent(scanner)
+      spaces = scanner.scan(/ +/) || ''
+      raise SyntaxError if spaces.size.odd?
+
+      spaces.size / 2
+    end
+
+    def parse_line(scanner)
       case scanner.scan(/./)
       when '!'
         parse_doctype(scanner)
       when '%'
         parse_element(scanner)
+      else
+        scanner.unscan
+        parse_text(scanner)
       end
     end
 
@@ -43,5 +64,23 @@ module Hamilton
       end
       ast
     end
+
+    def parse_text(scanner)
+      text = scanner.scan(/.+/)
+      return nil unless text
+
+      [:static, text]
+    end
+
+    def compile_stack
+      return nil if @stack.empty?
+
+      ast = @stack.pop
+      while parent = @stack.pop
+        parent << ast
+        ast = parent
+      end
+      ast
+    end
   end
 end

spec/hamilton/engine/element_spec.rb

@@ -3,5 +3,12 @@ describe Hamilton::Engine do
     it 'parses one-line element' do
       expect(render_string('%span hello')).to eq('<span>hello</span>')
     end
+
+    it 'parses multi-line element' do
+      expect(render_string(<<-HAML.unindent)).to eq("<span>hello</span>")
+        %span
+          hello
+      HAML
+    end
   end
 end

spec/spec_helper.rb

@@ -1,4 +1,5 @@
 require 'hamilton'
+require 'unindent'
 
 module HamiltonSpecHelper
   def parse_string(str)