95 lines
2.9 KiB
Ruby
Executable File
95 lines
2.9 KiB
Ruby
Executable File
# -*- coding: utf-8 -*-
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#
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#--
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# Copyright (C) 2009-2010 Thomas Leitner <t_leitner@gmx.at>
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#
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# This file is part of kramdown.
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#
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# kramdown is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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#
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module Kramdown
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module Parser
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# == Base class for parsers
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#
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# This class serves as base class for parsers. It provides common methods that can/should be
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# used by all parsers, especially by those using StringScanner for parsing.
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#
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class Base
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# Initialize the parser with the given Kramdown document +doc+.
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def initialize(doc)
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@doc = doc
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@text_type = :text
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end
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private_class_method(:new, :allocate)
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# Parse the +source+ string into an element tree, using the information provided by the
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# Kramdown document +doc+.
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#
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# Initializes a new instance of the calling class and then calls the #parse method that must
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# be implemented by each subclass.
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def self.parse(source, doc)
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new(doc).parse(source)
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end
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# Add the given warning +text+ to the warning array of the Kramdown document.
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def warning(text)
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@doc.warnings << text
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#TODO: add position information
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end
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# Modify the string +source+ to be usable by the parser.
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def adapt_source(source)
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source.gsub(/\r\n?/, "\n").chomp + "\n"
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end
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# This helper method adds the given +text+ either to the last element in the +tree+ if it is a
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# +type+ element or creates a new text element with the given +type+.
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def add_text(text, tree = @tree, type = @text_type)
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if tree.children.last && tree.children.last.type == type
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tree.children.last.value << text
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elsif !text.empty?
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tree.children << Element.new(type, text)
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end
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end
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# Extract the part of the StringScanner +srcscan+ backed string specified by the +range+. This
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# method also works correctly under Ruby 1.9.
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def extract_string(range, strscan)
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result = nil
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if RUBY_VERSION >= '1.9'
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begin
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enc = strscan.string.encoding
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strscan.string.force_encoding('ASCII-8BIT')
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result = strscan.string[range].force_encoding(enc)
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ensure
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strscan.string.force_encoding(enc)
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end
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else
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result = strscan.string[range]
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end
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result
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end
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end
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end
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end
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