Class: Prawn::Text::Formatted::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/prawn/text/formatted/parser.rb

Extension API collapse

PARSER_REGEX = 
begin
  regex_string = "\n|" \
                '<b>|</b>|' \
                '<i>|</i>|' \
                '<u>|</u>|' \
                '<strikethrough>|</strikethrough>|' \
                '<sub>|</sub>|' \
                '<sup>|</sup>|' \
                '<link[^>]*>|</link>|' \
                '<color[^>]*>|</color>|' \
                '<font[^>]*>|</font>|' \
                '<strong>|</strong>|' \
                '<em>|</em>|' \
                '<a[^>]*>|</a>|' \
                "[^<\n]+"
  Regexp.new(regex_string, Regexp::MULTILINE)
end

Extension API collapse

Class Method Details

.array_from_tokens(tokens) ⇒ Object 



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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
 
# File 'lib/prawn/text/formatted/parser.rb', line 126

def self.array_from_tokens(tokens)
  array = []
  styles = []
  colors = []
  link = nil
  anchor = nil
  local = nil
  fonts = []
  sizes = []
  character_spacings = []

  tokens.each do |token|
    case token
    when '<b>', '<strong>'
      styles << :bold
    when '<i>', '<em>'
      styles << :italic
    when '<u>'
      styles << :underline
    when '<strikethrough>'
      styles << :strikethrough
    when '<sub>'
      styles << :subscript
    when '<sup>'
      styles << :superscript
    when '</b>', '</strong>'
      styles.delete(:bold)
    when '</i>', '</em>'
      styles.delete(:italic)
    when '</u>'
      styles.delete(:underline)
    when '</strikethrough>'
      styles.delete(:strikethrough)
    when '</sub>'
      styles.delete(:subscript)
    when '</sup>'
      styles.delete(:superscript)
    when '</link>', '</a>'
      link = nil
      anchor = nil
      local = nil
    when '</color>'
      colors.pop
    when '</font>'
      fonts.pop
      sizes.pop
      character_spacings.pop
    when /^<link[^>]*>$/, /^<a[^>]*>$/
      matches = /href="([^"]*)"/.match(token) ||
        /href='([^']*)'/.match(token)
      link = matches[1] unless matches.nil?

      matches = /anchor="([^"]*)"/.match(token) ||
        /anchor='([^']*)'/.match(token)
      anchor = matches[1] unless matches.nil?

      matches = /local="([^"]*)"/.match(token) ||
        /local='([^']*)'/.match(token)
      local = matches[1] unless matches.nil?
    when /^<color[^>]*>$/
      matches = /rgb="#?([^"]*)"/.match(token) ||
        /rgb='#?([^']*)'/.match(token)
      colors << matches[1] if matches

      match = /c="#?([^"]*)"/.match(token) ||
        /c='#?([^']*)'/.match(token)
      c = match[1].to_i unless match.nil?
      match = /m="#?([^"]*)"/.match(token) ||
        /m='#?([^']*)'/.match(token)
      m = match[1].to_i unless match.nil?
      match = /y="#?([^"]*)"/.match(token) ||
        /y='#?([^']*)'/.match(token)
      y = match[1].to_i unless match.nil?
      match = /k="#?([^"]*)"/.match(token) ||
        /k='#?([^']*)'/.match(token)
      k = match[1].to_i unless match.nil?
      colors << [c, m, y, k] if [c, m, y, k].all?

      # intend to support rgb="#ffffff" or rgb='#ffffff',
      # r="255" g="255" b="255" or r='255' g='255' b='255',
      # and c="100" m="100" y="100" k="100" or
      # c='100' m='100' y='100' k='100'
      # color = { :rgb => "#ffffff" }
      # color = { :r => 255, :g => 255, :b => 255 }
      # color = { :c => 100, :m => 100, :y => 100, :k => 100 }
    when /^<font[^>]*>$/
      matches = /name="([^"]*)"/.match(token) ||
        /name='([^']*)'/.match(token)
      fonts << matches[1] unless matches.nil?

      matches = /size="([^"]*)"/.match(token) ||
        /size='([^']*)'/.match(token)
      sizes << matches[1].to_f unless matches.nil?

      matches = /character_spacing="([^"]*)"/.match(token) ||
        /character_spacing='([^']*)'/.match(token)
      character_spacings << matches[1].to_f unless matches.nil?
    else
      string = token.gsub('&lt;', '<').gsub('&gt;', '>')
        .gsub('&amp;', '&')
      array << {
        text: string,
        styles: styles.dup,
        color: colors.last,
        local: local,
        link: link,
        anchor: anchor,
        font: fonts.last,
        size: sizes.last,
        character_spacing: character_spacings.last
      }
    end
  end
  array
end

.array_paragraphs(array) ⇒ Object

:nodoc:



103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
 
# File 'lib/prawn/text/formatted/parser.rb', line 103

def self.array_paragraphs(array) #:nodoc:
  paragraphs = []
  paragraph = []
  previous_string = "\n"
  scan_pattern = /[^\n]+|\n/
  array.each do |hash|
    hash[:text].scan(scan_pattern).each do |string|
      if string == "\n"
        if previous_string == "\n"
          paragraph << hash.dup.merge(text: "\n")
        end
        paragraphs << paragraph unless paragraph.empty?
        paragraph = []
      else
        paragraph << hash.dup.merge(text: string)
      end
      previous_string = string
    end
  end
  paragraphs << paragraph unless paragraph.empty?
  paragraphs
end

.format(string, *_args) ⇒ Object 



36
37
38
39
 
# File 'lib/prawn/text/formatted/parser.rb', line 36

def self.format(string, *_args)
  tokens = string.gsub(%r{<br\s*/?>}, "\n").scan(PARSER_REGEX)
  array_from_tokens(tokens)
end

.to_string(array) ⇒ Object 



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
 
# File 'lib/prawn/text/formatted/parser.rb', line 41

def self.to_string(array)
  prefixes = {
    bold: '<b>',
    italic: '<i>',
    underline: '<u>',
    strikethrough: '<strikethrough>',
    subscript: '<sub>',
    superscript: '<sup>'
  }
  suffixes = {
    bold: '</b>',
    italic: '</i>',
    underline: '</u>',
    strikethrough: '</strikethrough>',
    subscript: '</sub>',
    superscript: '</sup>'
  }
  array.map do |hash|
    prefix = ''
    suffix = ''
    hash[:styles]&.each do |style|
      prefix += prefixes[style]
      suffix = suffixes[style] + suffix
    end

    font = hash[:font] ? " name='#{hash[:font]}'" : nil
    size = hash[:size] ? " size='#{hash[:size]}'" : nil
    character_spacing =
      if hash[:character_spacing]
        " character_spacing='#{hash[:character_spacing]}'"
      end
    if font || size || character_spacing
      prefix += "<font#{font}#{size}#{character_spacing}>"
      suffix = '</font>'
    end

    link = hash[:link] ? " href='#{hash[:link]}'" : nil
    anchor = hash[:anchor] ? " anchor='#{hash[:anchor]}'" : nil
    if link || anchor
      prefix += "<link#{link}#{anchor}>"
      suffix = '</link>'
    end

    if hash[:color]
      prefix +=
        if hash[:color].is_a?(Array)
          "<color c='#{hash[:color][0]}'" \
            " m='#{hash[:color][1]}'" \
            " y='#{hash[:color][2]}'" \
            " k='#{hash[:color][3]}'>"
        else
          "<color rgb='#{hash[:color]}'>"
        end
      suffix = '</color>'
    end

    string = hash[:text].gsub('&', '&amp;').gsub('>', '&gt;')
      .gsub('<', '&lt;')
    prefix + string + suffix
  end.join
end