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

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

Constant Summary

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

+ (Object) array_from_tokens(tokens)



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
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
# File 'lib/prawn/text/formatted/parser.rb', line 120

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

  while token = tokens.shift
    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
    else
      if token =~ /^<link[^>]*>$/ or token =~ /^<a[^>]*>$/
        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?
      elsif token =~ /^<color[^>]*>$/
        matches = /rgb="#?([^"]*)"/.match(token) || /rgb='#?([^']*)'/.match(token)
        colors << matches[1] if matches

        matches = /c="#?([^"]*)" +m="#?([^"]*)" +y="#?([^"]*)" +k="#?([^"]*)"/.match(token) ||
                  /c='#?([^']*)' +m='#?([^']*)' +y='#?([^']*)' +k='#?([^']*)'/.match(token)
        colors << [matches[1].to_i, matches[2].to_i, matches[3].to_i, matches[4].to_i] if matches

        # 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 }
      elsif token =~ /^<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
  end
  array
end

+ (Object) array_paragraphs(array)

:nodoc:



99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
# File 'lib/prawn/text/formatted/parser.rb', line 99

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"
        paragraph << hash.dup.merge(:text => "\n") if previous_string == "\n"
        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

+ (Object) format(string, *args)



35
36
37
38
# File 'lib/prawn/text/formatted/parser.rb', line 35

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

+ (Object) to_string(array)



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
# File 'lib/prawn/text/formatted/parser.rb', line 40

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.collect do |hash|
    prefix = ""
    suffix = ""
    if hash[:styles]
      hash[:styles].each do |style|
        prefix = prefix + prefixes[style]
        suffix = suffixes[style] + suffix
      end
    end

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

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

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