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module MaRuKu::In::Markdown::BlockLevelParser
# This represents a source of lines that can be consumed.
#
# It is the twin of CharSource.
#
class LineSource
attr_reader :parent
def initialize(lines, parent=nil, parent_offset=nil)
raise "NIL lines? " unless lines
@lines = lines.map {|l| l.kind_of?(MaRuKu::MDLine) ? l : MaRuKu::MDLine.new(l) }
@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
l
end
def ignore_line
raise "Over the rainbow" if @lines_index >= @lines.size
@lines_index += 1
end
def describe
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
from.upto(to) do |i|
prefix = (i == @lines_index) ? '--> ' : ' ';
l = @lines[i]
s += "%10s %4s|%s" %
[@lines[i].md_type.to_s, prefix, l]
s += "|\n"
end
s
end
def original_line_number(index)
if @parent
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
@lines_index.upto(@lines.size - 1) do |i|
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
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