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Contents
require 'emoji'
module HTML
class Pipeline
# HTML filter that replaces :emoji: with images.
#
# Context:
# :asset_root (required) - base url to link to emoji sprite
class EmojiFilter < Filter
# Build a regexp that matches all valid :emoji: names.
EmojiPattern = /:(#{Emoji.names.map { |name| Regexp.escape(name) }.join('|')}):/
def call
doc.search('text()').each do |node|
content = node.to_html
next if !content.include?(':')
next if has_ancestor?(node, %w(pre code))
html = emoji_image_filter(content)
next if html == content
node.replace(html)
end
doc
end
# Implementation of validate hook.
# Errors should raise exceptions or use an existing validator.
def validate
needs :asset_root
end
# Replace :emoji: with corresponding images.
#
# text - String text to replace :emoji: in.
#
# Returns a String with :emoji: replaced with images.
def emoji_image_filter(text)
return text unless text.include?(':')
text.gsub EmojiPattern do |match|
name = $1
"<img class='emoji' title=':#{name}:' alt=':#{name}:' src='#{File.join(asset_root, "emoji", "#{name}.png")}' height='20' width='20' align='absmiddle' />"
end
end
# The base url to link emoji sprites
#
# Raises ArgumentError if context option has not been provided.
# Returns the context's asset_root.
def asset_root
context[:asset_root]
end
end
end
end
Version data entries
16 entries across 16 versions & 3 rubygems