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
|
module ActionView
module Helpers #:nodoc:
# Provides a set of methods for working with text strings that can help unburden the level of inline Ruby code in the
# templates. In the example below we iterate over a collection of posts provided to the template and prints each title
# after making sure it doesn't run longer than 20 characters:
# <% for post in @posts %>
# Title: <%= truncate(post.title, 20) %>
# <% end %>
module TextHelper
# The regular puts and print are outlawed in eRuby. It's recommended to use the <%= "hello" %> form instead of print "hello".
# If you absolutely must use a method-based output, you can use concat. It's use like this <% concat "hello", binding %>. Notice that
# it doesn't have an equal sign in front. Using <%= concat "hello" %> would result in a double hello.
def concat(string, binding)
eval("_erbout", binding).concat(string)
end
# Truncates +text+ to the length of +length+ and replaces the last three characters with the +truncate_string+
# if the +text+ is longer than +length+.
def truncate(text, length = 30, truncate_string = "...")
if text.nil? then return end
if text.length > length then text[0..(length - 3)] + truncate_string else text end
end
# Highlights the +phrase+ where it is found in the +text+ by surrounding it like
# <strong class="highlight">I'm a highlight phrase</strong>. The highlighter can be specialized by
# passing +highlighter+ as single-quoted string with \1 where the phrase is supposed to be inserted.
# N.B.: The +phrase+ is sanitized to include only letters, digits, and spaces before use.
def highlight(text, phrase, highlighter = '<strong class="highlight">\1</strong>')
if text.nil? || phrase.nil? then return end
text.gsub(/(#{escape_regexp(phrase)})/i, highlighter) unless text.nil?
end
# Extracts an excerpt from the +text+ surrounding the +phrase+ with a number of characters on each side determined
# by +radius+. If the phrase isn't found, nil is returned. Ex:
# excerpt("hello my world", "my", 3) => "...lo my wo..."
def excerpt(text, phrase, radius = 100, excerpt_string = "...")
if text.nil? || phrase.nil? then return end
phrase = escape_regexp(phrase)
if found_pos = text =~ /(#{phrase})/i
start_pos = [ found_pos - radius, 0 ].max
end_pos = [ found_pos + phrase.length + radius, text.length ].min
prefix = start_pos > 0 ? excerpt_string : ""
postfix = end_pos < text.length ? excerpt_string : ""
prefix + text[start_pos..end_pos].strip + postfix
else
nil
end
end
# Attempts to pluralize the +singular+ word unless +count+ is 1. See source for pluralization rules.
def pluralize(count, singular, plural = nil)
"#{count} " + if count == 1
singular
elsif plural
plural
elsif Object.const_defined?("Inflector")
Inflector.pluralize(singular)
else
singular + "s"
end
end
begin
require "redcloth"
# Returns the text with all the Textile codes turned into HTML-tags.
# <i>This method is only available if RedCloth can be required</i>.
def textilize(text)
text.blank? ? "" : RedCloth.new(text, [ :hard_breaks ]).to_html
end
# Returns the text with all the Textile codes turned into HTML-tags, but without the regular bounding <p> tag.
# <i>This method is only available if RedCloth can be required</i>.
def textilize_without_paragraph(text)
textiled = textilize(text)
if textiled[0..2] == "<p>" then textiled = textiled[3..-1] end
if textiled[-4..-1] == "</p>" then textiled = textiled[0..-5] end
return textiled
end
rescue LoadError
# We can't really help what's not there
end
begin
require "bluecloth"
# Returns the text with all the Markdown codes turned into HTML-tags.
# <i>This method is only available if BlueCloth can be required</i>.
def markdown(text)
text.blank? ? "" : BlueCloth.new(text).to_html
end
rescue LoadError
# We can't really help what's not there
end
# Returns +text+ transformed into html using very simple formatting rules
# Surrounds paragraphs with <tt><p></tt> tags, and converts line breaks into <tt><br /></tt>
# Two consecutive newlines(<tt>\n\n</tt>) are considered as a paragraph, one newline (<tt>\n</tt>) is
# considered a linebreak, three or more consecutive newlines are turned into two newlines
def simple_format(text)
text.gsub!(/(\r\n|\n|\r)/, "\n") # lets make them newlines crossplatform
text.gsub!(/\n\n+/, "\n\n") # zap dupes
text.gsub!(/\n\n/, '</p>\0<p>') # turn two newlines into paragraph
text.gsub!(/([^\n])(\n)([^\n])/, '\1\2<br />\3') # turn single newline into <br />
return '<p>' + text + '</p>' # wrap the first and last line in paragraphs before we're done
end
# Turns all urls and email addresses into clickable links. The +link+ parameter can limit what should be linked.
# Options are :all (default), :email_addresses, and :urls.
#
# Example:
# auto_link("Go to http://www.rubyonrails.com and say hello to david@loudthinking.com") =>
# Go to <a href="http://www.rubyonrails.com">http://www.rubyonrails.com</a> and
# say hello to <a href="mailto:david@loudthinking.com">david@loudthinking.com</a>
def auto_link(text, link = :all)
case link
when :all then auto_link_urls(auto_link_email_addresses(text))
when :email_addresses then auto_link_email_addresses(text)
when :urls then auto_link_urls(text)
end
end
# Turns all links into words, like "<a href="something">else</a>" to "else".
def strip_links(text)
text.gsub(/<a.*>(.*)<\/a>/m, '\1')
end
private
# Returns a version of the text that's safe to use in a regular expression without triggering engine features.
def escape_regexp(text)
text.gsub(/([\\|?+*\/\)\(])/) { |m| "\\#{$1}" }
end
# Turns all urls into clickable links.
def auto_link_urls(text)
text.gsub(/(<\w+.*?>|[^=!:'"\/]|^)((?:http[s]?:\/\/)|(?:www\.))([^\s<]+\/?)([[:punct:]]|\s|<|$)/) do
all, a, b, c, d = $&, $1, $2, $3, $4
if a =~ /<a\s/i # don't replace URL's that are already linked
all
else
%(#{a}<a href="#{b=="www."?"http://www.":b}#{c}">#{b}#{c}</a>#{d})
end
end
end
# Turns all email addresses into clickable links.
def auto_link_email_addresses(text)
text.gsub(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/, '<a href="mailto:\1">\1</a>')
end
end
end
end
|
