/
string_extensions.rb
176 lines (166 loc) · 6.87 KB
/
string_extensions.rb
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module LuckySneaks
# These methods are all added on String class.
module StringExtensions
def self.included(base) # :nodoc:
base.extend(ClassMethods)
end
# Returns the string converted (via Textile/RedCloth) to HTML format or
# self if Redcloth is not available.
#
# Using <tt>:lite</tt> argument will cause RedCloth to not wrap the HTML in a container
# P element, which is useful behavior for generating header element text, etc.
# This is roughly equivalent to ActionView's <tt>textilize_without_paragraph</tt>
# except that it makes RedCloth do all the work instead of just gsubbing the return
# from RedCloth.
def to_html(lite_mode = false)
if defined?(RedCloth)
if lite_mode
RedCloth.new(self, [:lite_mode]).to_html
else
if self =~ /<pre>/
RedCloth.new(self).to_html.tr("\t", "")
else
RedCloth.new(self).to_html.tr("\t", "").gsub(/\n\n/, "")
end
end
else
self
end
end
# Create a URI-friendly representation of the string. This is used internally by
# acts_as_url[link:classes/LuckySneaks/ActsAsUrl/ClassMethods.html#M000012]
# but can be called manually in order to generate an URI-friendly version of any string.
def to_url
remove_formatting.downcase.replace_whitespace("-").collapse("-")
end
# Performs multiple text manipulations. Essentially a shortcut for typing them all. View source
# below to see which methods are run.
def remove_formatting
strip_html_tags.convert_accented_entities.convert_misc_entities.convert_misc_characters.to_ascii.collapse
end
# Removes HTML tags from text. This code is simplified from Tobias Luettke's regular expression
# in Typo[http://typosphere.org].
def strip_html_tags(leave_whitespace = false)
name = /[\w:_-]+/
value = /([A-Za-z0-9]+|('[^']*?'|"[^"]*?"))/
attr = /(#{name}(\s*=\s*#{value})?)/
rx = /<[!\/?\[]?(#{name}|--)(\s+(#{attr}(\s+#{attr})*))?\s*([!\/?\]]+|--)?>/
(leave_whitespace) ? gsub(rx, "").strip : gsub(rx, "").gsub(/\s+/, " ").strip
end
# Converts HTML entities into the respective non-accented letters. Examples:
#
# "á".convert_accented_entities # => "a"
# "ç".convert_accented_entities # => "c"
# "è".convert_accented_entities # => "e"
# "î".convert_accented_entities # => "i"
# "ø".convert_accented_entities # => "o"
# "ü".convert_accented_entities # => "u"
#
# Note: This does not do any conversion of Unicode/Ascii accented-characters. For that
# functionality please use <tt>to_ascii</tt>.
def convert_accented_entities
gsub(/&([A-Za-z])(grave|acute|circ|tilde|uml|ring|cedil|slash);/, '\1')
end
# Converts HTML entities (taken from common Textile/RedCloth formattings) into plain text formats.
#
# Note: This isn't an attempt at complete conversion of HTML entities, just those most likely
# to be generated by Textile.
def convert_misc_entities
dummy = dup
{
"#822[01]" => "\"",
"#821[67]" => "'",
"#8230" => "...",
"#8211" => "-",
"#8212" => "--",
"#215" => "x",
"gt" => ">",
"lt" => "<",
"(#8482|trade)" => "(tm)",
"(#174|reg)" => "(r)",
"(#169|copy)" => "(c)",
"(#38|amp)" => "and",
"nbsp" => " ",
"(#162|cent)" => " cent",
"(#163|pound)" => " pound",
"(#188|frac14)" => "one fourth",
"(#189|frac12)" => "half",
"(#190|frac34)" => "three fourths",
"(#176|deg)" => " degrees"
}.each do |textiled, normal|
dummy.gsub!(/&#{textiled};/, normal)
end
dummy.gsub(/&[^;]+;/, "")
end
# Converts various common plaintext characters to a more URI-friendly representation.
# Examples:
#
# "foo & bar".convert_misc_characters # => "foo and bar"
# "Chanel #9".convert_misc_characters # => "Chanel number nine"
# "user@host".convert_misc_characters # => "user at host"
# "google.com".convert_misc_characters # => "google dot com"
# "$10".convert_misc_characters # => "10 dollars"
# "*69".convert_misc_characters # => "star 69"
# "100%".convert_misc_characters # => "100 percent"
# "windows/mac/linux".convert_misc_characters # => "windows slash mac slash linux"
#
# Note: Because this method will convert any & symbols to the string "and",
# you should run any methods which convert HTML entities (convert_html_entities and convert_misc_entities)
# before running this method.
def convert_misc_characters
dummy = dup.gsub(/\.{3,}/, " dot dot dot ") # Catch ellipses before single dot rule!
# Special rules for money
{
/(\s|^)\$(\d+)\.(\d+)(\s|$)/ => '\2 dollars \3 cents',
/(\s|^)£(\d+)\.(\d+)(\s|$)/u => '\2 pounds \3 pence',
}.each do |found, replaced|
replaced = " #{replaced} " unless replaced =~ /\\1/
dummy.gsub!(found, replaced)
end
# Back to normal rules
{
/\s*&\s*/ => "and",
/\s*#/ => "number",
/\s*@\s*/ => "at",
/(\S|^)\.(\S)/ => '\1 dot \2',
/(\s|^)\$(\d*)(\s|$)/ => '\2 dollars',
/(\s|^)£(\d*)(\s|$)/u => '\2 pounds',
/(\s|^)¥(\d*)(\s|$)/u => '\2 yen',
/\s*\*\s*/ => "star",
/\s*%\s*/ => "percent",
/\s*(\\|\/)\s*/ => "slash",
}.each do |found, replaced|
replaced = " #{replaced} " unless replaced =~ /\\1/
dummy.gsub!(found, replaced)
end
dummy = dummy.gsub(/(^|\w)'(\w|$)/, '\1\2').gsub(/[\.,:;()\[\]\/\?!\^'"_]/, " ")
end
# Replace runs of whitespace in string. Defaults to a single space but any replacement
# string may be specified as an argument. Examples:
#
# "Foo bar".replace_whitespace # => "Foo bar"
# "Foo bar".replace_whitespace("-") # => "Foo-bar"
def replace_whitespace(replace = " ")
gsub(/\s+/, replace)
end
# Removes specified character from the beginning and/or end of the string and then performs
# <tt>String#squeeze(character)</tt>, condensing runs of the character within the string.
#
# Note: This method has been superceded by ActiveSupport's squish method.
def collapse(character = " ")
sub(/^#{character}*/, "").sub(/#{character}*$/, "").squeeze(character)
end
module ClassMethods
# Returns string of random characters with a length matching the specified limit. Excludes 0
# to avoid confusion between 0 and O.
def random(limit)
strong_alphanumerics = %w{
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
1 2 3 4 5 6 7 8 9
}
Array.new(limit, "").collect{strong_alphanumerics[rand(61)]}.join
end
end
end
end