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# -*- coding: utf-8 -*-
#
#--
# Copyright (C) 2009-2016 Thomas Leitner <t_leitner@gmx.at>
#
# This file is part of kramdown which is licensed under the MIT.
#++
#
# = kramdown
#
# kramdown is fast, pure Ruby Markdown superset converter, using a strict syntax definition and
# supporting several common extensions.
#
# The kramdown library is mainly written to support the kramdown-to-HTML conversion chain. However,
# due to its flexibility it supports other input and output formats as well. Here is a list of the
# supported formats:
#
# * input formats: kramdown (a Markdown superset), Markdown, GFM, HTML
# * output formats: HTML, kramdown, LaTeX (and therefore PDF), PDF via Prawn
#
# All the documentation on the available input and output formats is available at
# http://kramdown.gettalong.org.
#
# == Usage
#
# kramdown has a simple API, so using kramdown is as easy as
#
# require 'kramdown'
#
# Kramdown::Document.new(text).to_html
#
# For detailed information have a look at the *\Kramdown::Document* class.
#
# == License
#
# MIT - see the COPYING file.
require 'kramdown/version'
require 'kramdown/element'
require 'kramdown/error'
require 'kramdown/parser'
require 'kramdown/converter'
require 'kramdown/options'
require 'kramdown/utils'
module Kramdown
# Return the data directory for kramdown.
def self.data_dir
unless defined?(@@data_dir)
require 'rbconfig'
@@data_dir = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'data', 'kramdown'))
@@data_dir = File.expand_path(File.join(RbConfig::CONFIG["datadir"], "kramdown")) if !File.exist?(@@data_dir)
raise "kramdown data directory not found! This is a bug, please report it!" unless File.directory?(@@data_dir)
end
@@data_dir
end
# The main interface to kramdown.
#
# This class provides a one-stop-shop for using kramdown to convert text into various output
# formats. Use it like this:
#
# require 'kramdown'
# doc = Kramdown::Document.new('This *is* some kramdown text')
# puts doc.to_html
#
# The #to_html method is a shortcut for using the Converter::Html class. See #method_missing for
# more information.
#
# The second argument to the ::new method is an options hash for customizing the behaviour of the
# used parser and the converter. See ::new for more information!
class Document
# The root Element of the element tree. It is immediately available after the ::new method has
# been called.
attr_accessor :root
# The options hash which holds the options for parsing/converting the Kramdown document.
attr_reader :options
# An array of warning messages. It is filled with warnings during the parsing phase (i.e. in
# ::new) and the conversion phase.
attr_reader :warnings
# Create a new Kramdown document from the string +source+ and use the provided +options+. The
# options that can be used are defined in the Options module.
#
# The special options key :input can be used to select the parser that should parse the
# +source+. It has to be the name of a class in the Kramdown::Parser module. For example, to
# select the kramdown parser, one would set the :input key to +Kramdown+. If this key is not
# set, it defaults to +Kramdown+.
#
# The +source+ is immediately parsed by the selected parser so that the root element is
# immediately available and the output can be generated.
def initialize(source, options = {})
@options = Options.merge(options).freeze
parser = (@options[:input] || 'kramdown').to_s
parser = parser[0..0].upcase + parser[1..-1]
try_require('parser', parser)
if Parser.const_defined?(parser)
@root, @warnings = Parser.const_get(parser).parse(source, @options)
else
raise Kramdown::Error.new("kramdown has no parser to handle the specified input format: #{@options[:input]}")
end
end
# Check if a method is invoked that begins with +to_+ and if so, try to instantiate a converter
# class (i.e. a class in the Kramdown::Converter module) and use it for converting the document.
#
# For example, +to_html+ would instantiate the Kramdown::Converter::Html class.
def method_missing(id, *attr, &block)
if id.to_s =~ /^to_(\w+)$/ && (name = Utils.camelize($1)) &&
try_require('converter', name) && Converter.const_defined?(name)
output, warnings = Converter.const_get(name).convert(@root, @options)
@warnings.concat(warnings)
output
else
super
end
end
def inspect #:nodoc:
"<KD:Document: options=#{@options.inspect} root=#{@root.inspect} warnings=#{@warnings.inspect}>"
end
# Try requiring a parser or converter class and don't raise an error if the file is not found.
def try_require(type, name)
require("kramdown/#{type}/#{Utils.snake_case(name)}")
true
rescue LoadError
true
end
protected :try_require
end
end