Bring up to current.

lib/maruku/input/linesource.rb

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+#--
+#   Copyright (C) 2006  Andrea Censi  <andrea (at) rubyforge.org>
+#
+# This file is part of Maruku.
+# 
+#   Maruku 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.
+# 
+#   Maruku 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 Maruku; if not, write to the Free Software
+#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#++
+
+
+module MaRuKu; module In; module Markdown; module BlockLevelParser
+
+# This represents a source of lines that can be consumed.
+#
+# It is the twin of CharSource.
+#
+	
+class LineSource
+	include MaRuKu::Strings
+	
+	def initialize(lines, parent=nil, parent_offset=nil)
+		raise "NIL lines? " if not lines
+		@lines = lines
+		@lines_index = 0
+		@parent = parent
+		@parent_offset = parent_offset
+	end
+	
+	def cur_line()  @lines[@lines_index] end
+	def next_line() @lines[@lines_index+1] end
+		
+	def shift_line() 
+		raise "Over the rainbow" if @lines_index >= @lines.size 
+		l = @lines[@lines_index]
+		@lines_index += 1
+		return l
+	end
+	
+	def ignore_line
+		raise "Over the rainbow" if @lines_index >= @lines.size 
+		@lines_index += 1
+	end
+	
+	def describe
+		#s = "At line ##{@lines_index} of #{@lines.size}:\n"
+		s = "At line #{original_line_number(@lines_index)}\n"
+		
+		context = 3 # lines
+		from = [@lines_index-context, 0].max
+		to   = [@lines_index+context, @lines.size-1].min
+		
+		for i in from..to
+			prefix = (i == @lines_index) ? '--> ' : '    ';
+			l = @lines[i]
+			s += "%10s %4s|#{l}" %
+				[@lines[i].md_type.to_s, prefix]
+				
+			s += "|\n"
+		end
+		
+#		if @parent 
+#			s << "Parent context is: \n"
+#			s << add_tabs(@parent.describe,1,'|')
+#		end
+		s
+	end
+	
+	def original_line_number(index)
+		if @parent
+			return index + @parent.original_line_number(@parent_offset)
+		else
+			1 + index
+		end
+	end
+	
+	def cur_index
+		@lines_index
+	end
+	
+	# Returns the type of next line as a string
+	# breaks at first :definition
+	def tell_me_the_future
+		s = ""; num_e = 0;
+		for i in @lines_index..@lines.size-1
+			c = case @lines[i].md_type
+				when :text; "t"
+				when :empty; num_e+=1; "e"
+				when :definition; "d"
+				else "o"
+			end
+			s += c
+			break if c == "d" or num_e>1
+		end
+		s	
+	end
+	
+end # linesource
+
+end end end end # block
+