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module Gitlab
class Highlight
def self.highlight(blob_name, blob_content, repository: nil, nowrap: true, plain: false)
new(blob_name, blob_content, nowrap: nowrap, repository: repository).
highlight(blob_content, continue: false, plain: plain)
end
def self.highlight_lines(repository, ref, file_name)
blob = repository.blob_at(ref, file_name)
return [] unless blob
blob.load_all_data!(repository)
highlight(file_name, blob.data, repository: repository).lines.map!(&:html_safe)
end
attr_reader :lexer
def initialize(blob_name, blob_content, repository: nil, nowrap: true)
@blob_name = blob_name
@blob_content = blob_content
@repository = repository
@formatter = rouge_formatter(nowrap: nowrap)
@lexer = custom_language || begin
Rouge::Lexer.guess(filename: blob_name, source: blob_content).new
rescue Rouge::Lexer::AmbiguousGuess => e
e.alternatives.sort_by(&:tag).first
end
end
def highlight(text, continue: true, plain: false)
if plain
@formatter.format(Rouge::Lexers::PlainText.lex(text)).html_safe
else
@formatter.format(@lexer.lex(text, continue: continue)).html_safe
end
rescue
@formatter.format(Rouge::Lexers::PlainText.lex(text)).html_safe
end
private
def custom_language
language_name = @repository && @repository.gitattribute(@blob_name, 'gitlab-language')
return nil unless language_name
Rouge::Lexer.find_fancy(language_name)
end
def rouge_formatter(options = {})
options = options.reverse_merge(
nowrap: true,
cssclass: 'code highlight',
lineanchors: true,
lineanchorsid: 'LC'
)
Rouge::Formatters::HTMLGitlab.new(options)
end
end
end
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