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-rw-r--r--commonmark.rb79
1 files changed, 79 insertions, 0 deletions
diff --git a/commonmark.rb b/commonmark.rb
new file mode 100644
index 0000000..0d7fa0e
--- /dev/null
+++ b/commonmark.rb
@@ -0,0 +1,79 @@
+require 'ffi'
+
+module CMark
+ extend FFI::Library
+ ffi_lib ['libcmark', 'cmark']
+ typedef :pointer, :node
+ enum :node_type, [:document, :blockquote, :list, :list_item,
+ :fenced_code, :indented_code, :html, :paragraph,
+ :atx_header, :setext_header, :hrule, :reference_def,
+ :str, :softbreak, :linebreak, :code, :inline_html,
+ :emph, :strong, :link, :image]
+ enum :node_type, []
+ attach_function :cmark_markdown_to_html, [:string, :int], :string
+ attach_function :cmark_parse_document, [:string, :int], :node
+ attach_function :cmark_node_first_child, [:node], :node
+ attach_function :cmark_node_next, [:node], :node
+ attach_function :cmark_node_get_type, [:node], :node_type
+end
+
+def pointer_to_block(pointer)
+ if pointer.null?
+ raise NullPointer
+ else
+ node_type = CMark::cmark_node_get_type(pointer)
+ if node_type == 0 # document
+ children = []
+ b = CMark::cmark_node_first_child(pointer)
+ while !b.null?
+ children << pointer_to_block(b)
+ b = CMark::cmark_node_next(b)
+ end
+ return Document.new(children)
+ elsif node_type == 7 # paragraph
+ return Paragraph.new("TODO")
+ else
+ raise UnknownNodeType, node_type
+ end
+ end
+end
+
+class Block
+ def initialize
+ end
+end
+
+class Document < Block
+ attr_accessor :children
+ def initialize(children)
+ @children = children
+ end
+end
+
+class Paragraph < Block
+ def initialize(inlines)
+ @contents = "inlines" # TODO
+ end
+ def to_html
+ "<p>" + @contents + "</p>"
+ end
+end
+
+class Inline
+end
+
+def parse_markdown(s)
+ len = s.bytes.length
+ pointer_to_block(CMark::cmark_parse_document(s, len))
+end
+
+def markdown_to_html(s)
+ len = s.bytes.length
+ CMark::cmark_markdown_to_html(s, len)
+end
+
+doc = parse_markdown(STDIN.read())
+doc.children.each do |b|
+ print(b)
+end
+# print markdown_to_html(STDIN.read())