Class: Gollum::Filter::Code

Inherits:
Gollum::Filter show all
Defined in:
lib/gollum-lib/filter/code.rb

Overview

Code

Render a block of code using the Rouge syntax-highlighter.

Instance Method Summary collapse

Methods inherited from Gollum::Filter

#initialize

Methods included from Helpers

#trim_leading_slash

Constructor Details

This class inherits a constructor from Gollum::Filter

Instance Method Details

#extract(data) ⇒ Object 



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
 
# File 'lib/gollum-lib/filter/code.rb', line 7

def extract(data)
  case @markup.format
  when :txt
    return data
  when :asciidoc
    data.gsub!(/^(\[source,([^\r\n]*)\]\n)?----\n(.+?)\n----$/m) do
      cache_codeblock(Regexp.last_match[2], Regexp.last_match[3])
    end
  when :org
    org_headers = %r{([ \t]*#\+HEADER[S]?:[^\r\n]*\n)*}
    org_name = %r{([ \t]*#\+NAME:[^\r\n]*\n)?}
    org_lang = %r{[ ]*([^\n \r]*)[ ]*[^\r\n]*}
    org_begin = %r{[ \t]*#\+BEGIN_SRC#{org_lang}\n}
    org_end = %r{\n[ \t]*#\+END_SRC[ \t]*}
    data.gsub!(/^#{org_headers}#{org_name}#{org_begin}(.+?)#{org_end}$/mi) do
      cache_codeblock(Regexp.last_match[3], Regexp.last_match[4])
    end
  end
  data.gsub!(/^([ \t]*)(~~~+) ?([^\r\n]+)?\r?\n(.+?)\r?\n\1(~~~+)[ \t\r]*$/m) do
    m_indent = Regexp.last_match[1]
    m_start  = Regexp.last_match[2] # ~~~
    m_lang   = Regexp.last_match[3]
    m_code   = Regexp.last_match[4]
    m_end    = Regexp.last_match[5] # ~~~
    # start and finish tilde fence must be the same length
    next '' if m_start.length != m_end.length
    lang = m_lang ? m_lang.strip : nil
    if lang
      lang = lang.match(/\.([^}\s]+)/)
      lang = lang[1] unless lang.nil?
    end
    "#{m_indent}#{cache_codeblock(lang, m_code, m_indent)}"
  end

  data.gsub!(/^([ \t]*)``` ?([^\r\n]+)?\r?\n(.+?)\r?\n\1```[ \t]*\r?$/m) do
    "#{Regexp.last_match[1]}#{cache_codeblock(Regexp.last_match[2].to_s.strip, Regexp.last_match[3], Regexp.last_match[1])}" # print the SHA1 ID with the proper indentation
  end
  data
end

#process(data) ⇒ Object

Process all code from the codemap and replace the placeholders with the final HTML.

data - The String data (with placeholders). encoding - Encoding Constant or String.

Returns the marked up String data.



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
 
# File 'lib/gollum-lib/filter/code.rb', line 54

def process(data)
  return data if data.nil? || data.size.zero? || @map.size.zero?

  blocks = []

  @map.each do |_id, spec|
    next if spec[:output] # cached

    code = spec[:code]

    remove_leading_space(code, /^#{spec[:indent]}/m)
    remove_leading_space(code, /^(  |\t)/m)

    blocks << [spec[:lang], code]
  end

  highlighted = []
  blocks.each do |lang, code|
    encoding = @markup.encoding || 'utf-8'

    if defined? Pygments
      # treat unknown and bash as standard pre tags
      if !lang || lang.downcase == 'bash'
        hl_code = "<pre>#{code}</pre>"
      else
        # Set the default lexer to 'text' to prevent #153
        lexer = Pygments::Lexer[(lang)] || Pygments::Lexer['text']

        # must set startinline to true for php to be highlighted without <?
        hl_code = lexer.highlight(code, :options => { :encoding => encoding.to_s, :startinline => true })
      end
    else # Rouge
      begin
        # if `lang` was not defined then assume plaintext
        # if `lang` is defined but cannot be found then wrap it and escape it
        lang ||= 'plaintext'
        if Rouge::Lexer.find(lang).nil?
          lexer     = Rouge::Lexers::PlainText.new
          formatter = Rouge::Formatters::HTML.new(:wrap => false)
          hl_code   = formatter.format(lexer.lex(code))
          hl_code   = "<pre class='highlight'><span class='err'>#{CGI.escapeHTML(hl_code)}</span></pre>"
        else
          hl_code = Rouge.highlight(code, lang, 'html')
        end
      rescue
        hl_code = code
      end
    end

    highlighted << hl_code
  end

  @map.each do |id, spec|
    body = spec[:output] || begin
      if (body = highlighted.shift.to_s).size > 0
        @markup.update_cache(:code, id, body)
        body
      else
        "<pre><code>#{CGI.escapeHTML(spec[:code])}</code></pre>"
      end
    end
    # Removes paragraph tags surrounding <pre> blocks, see issue https://github.com/gollum/gollum-lib/issues/97
    data.gsub!(/(<p>#{id}<\/p>|#{id})/) { body }
  end

  data
end