Sha256: ab272e11d13dd6607f3cea246e8ebdfd027b43f1f83d93850785a24b43a1c5d5
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Size: 1.6 KB
Versions: 6
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Stored size: 1.6 KB
Contents
class SyntaxHighlighter
class << self
def languages
require 'rouge'
Rouge::Lexer.all.map {|lexer| lexer.tag}.sort
end
def lexers
require 'rouge'
Rouge::Lexer.all.sort_by(&:title)
end
end
attr_reader :language, :theme
def initialize(language:, theme:)
@language = language
@theme = theme
end
def lexer
require 'rouge'
require 'glimmer-dsl-libui/ext/rouge/theme/glimmer'
# TODO Try to use Rouge::Lexer.find_fancy('guess', code) in the future to guess the language or otherwise detect it from file extension
@lexer ||= Rouge::Lexer.find_fancy(language)
@lexer ||= Rouge::Lexer.find_fancy('ruby') # default to Ruby if no lexer is found
end
def syntax_highlighting(text)
return [] if text.to_s.strip.empty?
@syntax_highlighting ||= {} # TODO consider memoizing/remembering the last value only to avoid wasting memory
unless @syntax_highlighting.keys.include?(text)
lex = lexer.lex(text).to_a
text_size = 0
@syntax_highlighting[text] = lex.map do |pair|
token_type = pair.first
token_text = pair.last
token_style = Rouge::Theme.find(theme).new.style_for(token_type)
{token_type: token_type, token_text: token_text, token_style: token_style}
end.each do |hash|
hash[:token_index] = text_size # TODO do we really need this? Also, consider renaming to something like token_character_index to clarify it is not the index of the token itself yet its first character
text_size += hash[:token_text].size
end
end
@syntax_highlighting[text]
end
end
Version data entries
6 entries across 6 versions & 1 rubygems