1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
require 'ffi'
require 'stringio'
require 'cgi'
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
attach_function :cmark_node_get_header_level, [:node], :int
end
class Node
attr_accessor :type, :children, :string_content, :header_level
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)
@header_level = CMark::cmark_node_get_header_level(pointer)
if @type == :document
self.free
end
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
class Renderer
def initialize(stream = nil)
if stream
@stream = stream
@stringwriter = false
else
@stringwriter = true
@stream = StringIO.new
end
@need_blocksep = false
end
def outf(format, *args)
@stream.printf(format, *args)
end
def out(*args)
args.each do |arg|
if arg.kind_of?(String)
@stream.write(arg)
elsif arg.kind_of?(Node)
self.render(arg)
elsif arg.kind_of?(Array)
arg.each { |x| self.out(x) }
else arg.kind_of?(Numeric)
@stream.write(arg)
end
end
end
def render(node)
case node.type
when :document
self.document(node.children)
if @stringwriter
return @stream.string
end
when :paragraph
self.startblock
self.paragraph(node.children)
self.endblock
when :setext_header, :atx_header
self.startblock
self.header(node.header_level, node.children)
self.endblock
when :str
self.str(node.string_content)
else
# raise "unimplemented " + node.type.to_s
end
end
def document(children)
self.out(children)
end
def startblock
if @need_blocksep
self.blocksep
end
end
def endblock
@need_blocksep = true
end
def blocksep
self.out("\n\n")
end
end
class HtmlRenderer < Renderer
def blocksep
self.out("\n")
end
def header(level, children)
self.out("<h", level, ">", children, "</h", level, ">")
end
def paragraph(children)
self.out("<p>", children, "</p>")
end
def str(content)
self.out(CGI.escapeHTML(content))
end
end
doc = Node.from_markdown(STDIN.read())
renderer = HtmlRenderer.new(STDOUT)
renderer.render(doc)
# def markdown_to_html(s)
# len = s.bytes.length
# CMark::cmark_markdown_to_html(s, len)
# end
# print markdown_to_html(STDIN.read())
|
