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discourse/lib/html_prettify.rb
Sam Saffron d0d5a138c3
DEV: stop freezing frozen strings 
We have the `# frozen_string_literal: true` comment on all our
files. This means all string literals are frozen. There is no need
to call #freeze on any literals.

For files with `# frozen_string_literal: true`

```
puts %w{a b}[0].frozen?
=> true

puts "hi".frozen?
=> true

puts "a #{1} b".frozen?
=> true

puts ("a " + "b").frozen?
=> false

puts (-("a " + "b")).frozen?
=> true
```

For more details see: https://samsaffron.com/archive/2018/02/16/reducing-string-duplication-in-ruby
2020-04-30 16:48:53 +10:00

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# frozen_string_literal: true
# heavily based off
# https://github.com/vmg/redcarpet/blob/master/ext/redcarpet/html_smartypants.c
# and
# https://github.com/jmcnevin/rubypants/blob/master/lib/rubypants/core.rb
# 99% of the code here is by Jeremy McNevin
#
# This Source File is available under BSD/MIT license as well as standard GPL
#
class HtmlPrettify < String
def self.render(html)
new(html).to_html
end
# Create a new RubyPants instance with the text in +string+.
#
# Allowed elements in the options array:
#
# 0 :: do nothing
# 1 :: enable all, using only em-dash shortcuts
# 2 :: enable all, using old school en- and em-dash shortcuts (*default*)
# 3 :: enable all, using inverted old school en and em-dash shortcuts
# -1 :: stupefy (translate HTML entities to their ASCII-counterparts)
#
# If you don't like any of these defaults, you can pass symbols to change
# RubyPants' behavior:
#
# <tt>:quotes</tt> :: quotes
# <tt>:backticks</tt> :: backtick quotes (``double'' only)
# <tt>:allbackticks</tt> :: backtick quotes (``double'' and `single')
# <tt>:dashes</tt> :: dashes
# <tt>:oldschool</tt> :: old school dashes
# <tt>:inverted</tt> :: inverted old school dashes
# <tt>:ellipses</tt> :: ellipses
# <tt>:convertquotes</tt> :: convert <tt>&quot;</tt> entities to
# <tt>"</tt>
# <tt>:stupefy</tt> :: translate RubyPants HTML entities
# to their ASCII counterparts.
#
# In addition, you can customize the HTML entities that will be injected by
# passing in a hash for the final argument. The defaults for these entities
# are as follows:
#
# <tt>:single_left_quote</tt> :: <tt>&#8216;</tt>
# <tt>:double_left_quote</tt> :: <tt>&#8220;</tt>
# <tt>:single_right_quote</tt> :: <tt>&#8217;</tt>
# <tt>:double_right_quote</tt> :: <tt>&#8221;</tt>
# <tt>:em_dash</tt> :: <tt>&#8212;</tt>
# <tt>:en_dash</tt> :: <tt>&#8211;</tt>
# <tt>:ellipsis</tt> :: <tt>&#8230;</tt>
# <tt>:html_quote</tt> :: <tt>&quot; </tt>
#
def initialize(string, options = [2], entities = {})
super string
@options = [*options]
@entities = default_entities.update(entities)
end
# Apply SmartyPants transformations.
def to_html
do_quotes = do_backticks = do_dashes = do_ellipses = nil
if @options.include?(0)
# Do nothing.
return self
elsif @options.include?(1)
# Do everything, turn all options on.
do_quotes = do_backticks = do_ellipses = true
do_dashes = :normal
elsif @options.include?(2)
# Do everything, turn all options on, use old school dash shorthand.
do_quotes = do_backticks = do_ellipses = true
do_dashes = :oldschool
elsif @options.include?(3)
# Do everything, turn all options on, use inverted old school
# dash shorthand.
do_quotes = do_backticks = do_ellipses = true
do_dashes = :inverted
elsif @options.include?(-1)
do_stupefy = true
else
do_quotes = @options.include?(:quotes)
do_backticks = @options.include?(:backticks)
do_backticks = :both if @options.include?(:allbackticks)
do_dashes = :normal if @options.include?(:dashes)
do_dashes = :oldschool if @options.include?(:oldschool)
do_dashes = :inverted if @options.include?(:inverted)
do_ellipses = @options.include?(:ellipses)
do_stupefy = @options.include?(:stupefy)
end
# Parse the HTML
tokens = tokenize
# Keep track of when we're inside <pre> or <code> tags.
in_pre = false
# Here is the result stored in.
result = +""
# This is a cheat, used to get some context for one-character
# tokens that consist of just a quote char. What we do is remember
# the last character of the previous text token, to use as context
# to curl single- character quote tokens correctly.
prev_token_last_char = nil
tokens.each do |token|
if token.first == :tag
result << token[1]
if token[1] =~ %r!<(/?)(?:pre|code|kbd|script|math)[\s>]!
in_pre = ($1 != "/") # Opening or closing tag?
end
else
t = token[1]
# Remember last char of this token before processing.
last_char = t[-1].chr
unless in_pre
t.gsub!("&#39;", "'")
t.gsub!("&quot;", '"')
if do_dashes
t = educate_dashes t if do_dashes == :normal
t = educate_dashes_oldschool t if do_dashes == :oldschool
t = educate_dashes_inverted t if do_dashes == :inverted
end
t = educate_ellipses t if do_ellipses
t = educate_fractions t
# Note: backticks need to be processed before quotes.
if do_backticks
t = educate_backticks t
t = educate_single_backticks t if do_backticks == :both
end
if do_quotes
if t == "'"
# Special case: single-character ' token
if prev_token_last_char =~ /\S/
t = entity(:single_right_quote)
else
t = entity(:single_left_quote)
end
elsif t == '"'
# Special case: single-character " token
if prev_token_last_char =~ /\S/
t = entity(:double_right_quote)
else
t = entity(:double_left_quote)
end
else
# Normal case:
t = educate_quotes t
end
end
t = stupefy_entities t if do_stupefy
end
prev_token_last_char = last_char
result << t
end
end
# Done
result
end
protected
# The string, with each instance of "<tt>--</tt>" translated to an
# em-dash HTML entity.
#
def educate_dashes(str)
str.
gsub(/--/, entity(:em_dash))
end
# The string, with each instance of "<tt>--</tt>" translated to an
# en-dash HTML entity, and each "<tt>---</tt>" translated to an
# em-dash HTML entity.
#
def educate_dashes_oldschool(str)
str.
gsub(/---/, entity(:em_dash)).
gsub(/--/, entity(:en_dash))
end
# Return the string, with each instance of "<tt>--</tt>" translated
# to an em-dash HTML entity, and each "<tt>---</tt>" translated to
# an en-dash HTML entity. Two reasons why: First, unlike the en- and
# em-dash syntax supported by +educate_dashes_oldschool+, it's
# compatible with existing entries written before SmartyPants 1.1,
# back when "<tt>--</tt>" was only used for em-dashes. Second,
# em-dashes are more common than en-dashes, and so it sort of makes
# sense that the shortcut should be shorter to type. (Thanks to
# Aaron Swartz for the idea.)
#
def educate_dashes_inverted(str)
str.
gsub(/---/, entity(:en_dash)).
gsub(/--/, entity(:em_dash))
end
# Return the string, with each instance of "<tt>...</tt>" translated
# to an ellipsis HTML entity. Also converts the case where there are
# spaces between the dots.
#
def educate_ellipses(str)
str.
gsub('...', entity(:ellipsis)).
gsub('. . .', entity(:ellipsis))
end
# Return the string, with "<tt>``backticks''</tt>"-style single quotes
# translated into HTML curly quote entities.
#
def educate_backticks(str)
str.
gsub("``", entity(:double_left_quote)).
gsub("''", entity(:double_right_quote))
end
# Return the string, with "<tt>`backticks'</tt>"-style single quotes
# translated into HTML curly quote entities.
#
def educate_single_backticks(str)
str.
gsub("`", entity(:single_left_quote)).
gsub("'", entity(:single_right_quote))
end
def educate_fractions(str)
str.gsub(/(\s+|^)(1\/4|1\/2|3\/4)([,.;\s]|$)/) do
frac =
if $2 == "1/2"
entity(:frac12)
elsif $2 == "1/4"
entity(:frac14)
elsif $2 == "3/4"
entity(:frac34)
end
"#{$1}#{frac}#{$3}"
end
end
# Return the string, with "educated" curly quote HTML entities.
#
def educate_quotes(str)
punct_class = '[!"#\$\%\'()*+,\-.\/:;<=>?\@\[\\\\\]\^_`{|}~]'
# normalize html
str = str.dup
# Special case if the very first character is a quote followed by
# punctuation at a non-word-break. Close the quotes by brute
# force:
str.gsub!(/^'(?=#{punct_class}\B)/,
entity(:single_right_quote))
str.gsub!(/^"(?=#{punct_class}\B)/,
entity(:double_right_quote))
# Special case for double sets of quotes, e.g.:
# <p>He said, "'Quoted' words in a larger quote."</p>
str.gsub!(/"'(?=\w)/,
"#{entity(:double_left_quote)}#{entity(:single_left_quote)}")
str.gsub!(/'"(?=\w)/,
"#{entity(:single_left_quote)}#{entity(:double_left_quote)}")
# Special case for decade abbreviations (the '80s):
str.gsub!(/'(?=\d\ds)/,
entity(:single_right_quote))
close_class = %![^\ \t\r\n\\[\{\(\-]!
dec_dashes = "#{entity(:en_dash)}|#{entity(:em_dash)}"
# Get most opening single quotes:
str.gsub!(/(\s|&nbsp;|=|--|&[mn]dash;|#{dec_dashes}|&#x201[34];)'(?=\w)/,
'\1' + entity(:single_left_quote))
# Single closing quotes:
str.gsub!(/(#{close_class})'/,
'\1' + entity(:single_right_quote))
str.gsub!(/'(\s|s\b|$)/,
entity(:single_right_quote) + '\1')
# Any remaining single quotes should be opening ones:
str.gsub!(/'/,
entity(:single_left_quote))
# Get most opening double quotes:
str.gsub!(/(\s|&nbsp;|=|--|&[mn]dash;|#{dec_dashes}|&#x201[34];)"(?=\w)/,
'\1' + entity(:double_left_quote))
# Double closing quotes:
str.gsub!(/(#{close_class})"/,
'\1' + entity(:double_right_quote))
str.gsub!(/"(\s|s\b|$)/,
entity(:double_right_quote) + '\1')
# Any remaining quotes should be opening ones:
str.gsub!(/"/,
entity(:double_left_quote))
str
end
# Return the string, with each RubyPants HTML entity translated to
# its ASCII counterpart.
#
# Note: This is not reversible (but exactly the same as in SmartyPants)
#
def stupefy_entities(str)
new_str = str.dup
{
en_dash: '-',
em_dash: '--',
single_left_quote: "'",
single_right_quote: "'",
double_left_quote: '"',
double_right_quote: '"',
ellipsis: '...'
}.each do |k, v|
new_str.gsub!(/#{entity(k)}/, v)
end
new_str
end
# Return an array of the tokens comprising the string. Each token is
# either a tag (possibly with nested, tags contained therein, such
# as <tt><a href="<MTFoo>"></tt>, or a run of text between
# tags. Each element of the array is a two-element array; the first
# is either :tag or :text; the second is the actual value.
#
# Based on the <tt>_tokenize()</tt> subroutine from Brad Choate's
# MTRegex plugin. <http://www.bradchoate.com/past/mtregex.php>
#
# This is actually the easier variant using tag_soup, as used by
# Chad Miller in the Python port of SmartyPants.
#
def tokenize
tag_soup = /([^<]*)(<[^>]*>)/
tokens = []
prev_end = 0
scan(tag_soup) do
tokens << [:text, $1] if $1 != ""
tokens << [:tag, $2]
prev_end = $~.end(0)
end
if prev_end < size
tokens << [:text, self[prev_end..-1]]
end
tokens
end
def default_entities
{
single_left_quote: "&lsquo;",
double_left_quote: "&ldquo;",
single_right_quote: "&rsquo;",
double_right_quote: "&rdquo;",
em_dash: "&mdash;",
en_dash: "&ndash;",
ellipsis: "&hellip;",
html_quote: "&quot;",
frac12: "&frac12;",
frac14: "&frac14;",
frac34: "&frac34;",
}
end
def entity(key)
@entities[key]
end
end
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