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|
# frozen_string_literal: true
# Redmine - project management software
# Copyright (C) 2006-2019 Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
module Redmine
module SyntaxHighlighting
class << self
attr_reader :highlighter
def highlighter=(name)
if name.is_a?(Module)
@highlighter = name
else
@highlighter = const_get(name)
end
end
def highlight_by_filename(text, filename)
highlighter.highlight_by_filename(text, filename)
rescue
ERB::Util.h(text)
end
def highlight_by_language(text, language)
highlighter.highlight_by_language(text, language)
rescue
ERB::Util.h(text)
end
def language_supported?(language)
if highlighter.respond_to? :language_supported?
highlighter.language_supported? language
else
true
end
rescue
false
end
def filename_supported?(filename)
if highlighter.respond_to? :filename_supported?
highlighter.filename_supported? filename
else
false
end
end
end
module Rouge
require 'rouge'
# Customized formatter based on Rouge::Formatters::HTMLLinewise
# Syntax highlighting is completed within each line.
class CustomHTMLLinewise < ::Rouge::Formatter
def initialize(formatter)
@formatter = formatter
end
def stream(tokens, &b)
token_lines(tokens) do |line|
line.each do |tok, val|
yield @formatter.span(tok, val)
end
yield "\n"
end
end
end
class << self
# Highlights +text+ as the content of +filename+
# Should not return line numbers nor outer pre tag
def highlight_by_filename(text, filename)
# TODO: Delete the following workaround for #30434 and
# test_syntax_highlight_should_normalize_line_endings in
# application_helper_test.rb when Rouge is improved to
# handle CRLF properly.
# See also: https://github.com/jneen/rouge/pull/1078
text = text.gsub(/\r\n?/, "\n")
lexer =::Rouge::Lexer.guess(:source => text, :filename => filename)
formatter = ::Rouge::Formatters::HTML.new
::Rouge.highlight(text, lexer, CustomHTMLLinewise.new(formatter))
end
# Highlights +text+ using +language+ syntax
# Should not return outer pre tag
def highlight_by_language(text, language)
lexer =
find_lexer(language.to_s.downcase) || ::Rouge::Lexers::PlainText
::Rouge.highlight(text, lexer, ::Rouge::Formatters::HTML)
end
def language_supported?(language)
find_lexer(language.to_s.downcase) ? true : false
end
def filename_supported?(filename)
!::Rouge::Lexer.guesses(:filename => filename).empty?
end
private
# Alias names used by CodeRay and not supported by Rouge
LANG_ALIASES = {
'delphi' => 'pascal',
'cplusplus' => 'cpp',
'ecmascript' => 'javascript',
'ecma_script' => 'javascript',
'java_script' => 'javascript',
'xhtml' => 'html'
}
def find_lexer(language)
::Rouge::Lexer.find(language) ||
::Rouge::Lexer.find(LANG_ALIASES[language])
end
end
end
end
SyntaxHighlighting.highlighter = 'Rouge'
end
|
