From fc69b7d45ed1ffc7c722b170bd73de313daeebfb Mon Sep 17 00:00:00 2001
From: Jordan Orelli <jordanorelli@gmail.com>
Date: Wed, 4 Nov 2015 16:41:33 -0500
Subject: [PATCH] treetop parser?

---
 .gitignore                 |  3 +++
 bbsandbox.rb               |  5 ++++-
 bristle.rb                 | 18 ++++++++++++++++++
 bristlecode_nodes.rb       | 37 +++++++++++++++++++++++++++++++++++++
 bristlecode_parser.treetop | 32 ++++++++++++++++++++++++++++++++
 5 files changed, 94 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore
 create mode 100644 bristle.rb
 create mode 100644 bristlecode_nodes.rb
 create mode 100644 bristlecode_parser.treetop

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fc9e5c3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+Gemfile.lock
+.bundle
+
diff --git a/bbsandbox.rb b/bbsandbox.rb
index f1cdcbe..61c7c2b 100644
--- a/bbsandbox.rb
+++ b/bbsandbox.rb
@@ -3,8 +3,9 @@ require 'slim'
 require 'digest/sha1'
 require 'bb-ruby'
 require 'ruby-bbcode'
+require './bristle.rb'
 
-@@engines = ['bb-ruby', 'ruby-bbcode', 'raw']
+@@engines = ['bb-ruby', 'ruby-bbcode', 'raw', 'bristle']
 
 get '/' do
   @posts = list_posts
@@ -35,6 +36,8 @@ def exec_bbcode(engine, body)
     BBRuby.to_html body
   when "ruby-bbcode"
     RubyBBCode.to_html body
+  when "bristle"
+    Bristle.parse body
   when "raw"
     body
   else
diff --git a/bristle.rb b/bristle.rb
new file mode 100644
index 0000000..ceb42c2
--- /dev/null
+++ b/bristle.rb
@@ -0,0 +1,18 @@
+require 'sanitize'
+require 'treetop'
+
+base_path = File.expand_path(File.dirname(__FILE__))
+require File.join(base_path, 'bristlecode_nodes.rb')
+
+class Bristle
+  Treetop.load(File.join(File.expand_path(File.dirname(__FILE__)), 'bristlecode_parser.treetop'))
+  @@parser = BristlecodeParser.new
+
+  def self.parse(doc)
+    tree = @@parser.parse(doc)
+    if tree.nil?
+      raise Exception, "Bristlecode parse error at offset: #{@@parser.index}"
+    end
+    tree
+  end
+end
diff --git a/bristlecode_nodes.rb b/bristlecode_nodes.rb
new file mode 100644
index 0000000..11fdfd1
--- /dev/null
+++ b/bristlecode_nodes.rb
@@ -0,0 +1,37 @@
+module Bristlecode
+  class RootNode < Treetop::Runtime::SyntaxNode
+    def to_html
+      elements.each{|elem| elem.to_html} 
+    end
+  end
+
+  class TextNode < Treetop::Runtime::SyntaxNode
+    def initialize(input, interval, elements)
+      @text = input[interval]
+    end
+
+    def text_value
+      @text
+    end
+
+    def inspect(indent="")
+      "#{indent}TextNode: #{text_value}"
+    end
+
+    def to_html
+      text_value 
+    end
+  end
+
+  class BoldOpenNode < Treetop::Runtime::SyntaxNode
+  end
+
+  class BoldCloseNode < Treetop::Runtime::SyntaxNode
+  end
+
+  class BoldNode < Treetop::Runtime::SyntaxNode
+  end
+
+  class TagNode < Treetop::Runtime::SyntaxNode
+  end
+end
diff --git a/bristlecode_parser.treetop b/bristlecode_parser.treetop
new file mode 100644
index 0000000..1dcb10b
--- /dev/null
+++ b/bristlecode_parser.treetop
@@ -0,0 +1,32 @@
+grammar Bristlecode
+  rule root
+    (tag / text)+ <RootNode>
+  end
+
+  rule text
+    (!tag .)+ <TextNode>
+  end
+
+  rule tag
+    (bold) <TagNode>
+  end
+
+  ##############################
+  # bold
+  ##############################
+
+  rule bold
+    bold_open
+    ((!bold_close .)+ <TextNode>)
+    bold_close
+    <BoldNode>
+  end
+
+  rule bold_open
+    '[b]' <BoldOpenNode> / '[B]' <BoldOpenNode>
+  end
+
+  rule bold_close
+    '[/b]' <BoldCloseNode> / '[/B]' <BoldCloseNode>
+  end
+end