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require 'ffi'
require 'stringio'
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]
attach_function :cmark_free_nodes, [:node], :void
attach_function :cmark_node_unlink, [:node], :void
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_parent, [:node], :node
attach_function :cmark_node_next, [:node], :node
attach_function :cmark_node_previous, [:node], :node
attach_function :cmark_node_get_type, [:node], :node_type
attach_function :cmark_node_get_string_content, [:node], :string
class Node
attr_accessor :type, :children, :string_content, :pointer
def initialize(pointer)
if pointer.null?
return nil
end
@pointer = pointer
@type = CMark::cmark_node_get_type(pointer)
@children = []
first_child = CMark::cmark_node_first_child(pointer)
b = first_child
while !b.null?
@children << Node.new(b)
b = CMark::cmark_node_next(b)
end
@string_content = CMark::cmark_node_get_string_content(pointer)
if @type == :document
self.free
end
end
def to_html_stream(file)
file.printf("[%s]\n", self.type.to_s)
case self.type
when :document
self.children.each do |child|
child.to_html_stream(file)
end
when :paragraph
self.children.each do |child|
child.to_html_stream(file)
end
when :str
file.puts(self.string_content)
else
end
end
def to_html
self.to_html_stream(StringIO.new)
end
def self.from_markdown(s)
len = s.bytes.length
Node.new(CMark::cmark_parse_document(s, len))
end
def free
CMark::cmark_free_nodes(@pointer)
end
end
end
doc = CMark::Node.from_markdown(STDIN.read())
doc.to_html_stream(STDOUT)
# def markdown_to_html(s)
# len = s.bytes.length
# CMark::cmark_markdown_to_html(s, len)
# end
# print markdown_to_html(STDIN.read())
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