added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 152 insertions, 0 deletions

diff --git a/trunk/lib/rdoc/markup/lines.rb b/trunk/lib/rdoc/markup/lines.rb
new file mode 100644
index 0000000000..069492122f
--- /dev/null
+++ b/trunk/lib/rdoc/markup/lines.rb
@@ -0,0 +1,152 @@
+class RDoc::Markup
+
+  ##
+  # We store the lines we're working on as objects of class Line.  These
+  # contain the text of the line, along with a flag indicating the line type,
+  # and an indentation level.
+
+  class Line
+    INFINITY = 9999
+
+    LINE_TYPES = [
+      :BLANK,
+      :HEADING,
+      :LIST,
+      :PARAGRAPH,
+      :RULE,
+      :VERBATIM,
+    ]
+
+    # line type
+    attr_accessor :type
+
+    # The indentation nesting level
+    attr_accessor :level
+
+    # The contents
+    attr_accessor :text
+
+    # A prefix or parameter. For LIST lines, this is
+    # the text that introduced the list item (the label)
+    attr_accessor  :param
+
+    # A flag. For list lines, this is the type of the list
+    attr_accessor :flag
+
+    # the number of leading spaces
+    attr_accessor :leading_spaces
+
+    # true if this line has been deleted from the list of lines
+    attr_accessor :deleted
+
+    def initialize(text)
+      @text    = text.dup
+      @deleted = false
+
+      # expand tabs
+      1 while @text.gsub!(/\t+/) { ' ' * (8*$&.length - $`.length % 8)}  && $~ #`
+
+      # Strip trailing whitespace
+      @text.sub!(/\s+$/, '')
+
+      # and look for leading whitespace
+      if @text.length > 0
+        @text =~ /^(\s*)/
+        @leading_spaces = $1.length
+      else
+        @leading_spaces = INFINITY
+      end
+    end
+
+    # Return true if this line is blank
+    def blank?
+      @text.empty?
+    end
+
+    # stamp a line with a type, a level, a prefix, and a flag
+    def stamp(type, level, param="", flag=nil)
+      @type, @level, @param, @flag = type, level, param, flag
+    end
+
+    ##
+    # Strip off the leading margin
+
+    def strip_leading(size)
+      if @text.size > size
+        @text[0,size] = ""
+      else
+        @text = ""
+      end
+    end
+
+    def to_s
+      "#@type#@level: #@text"
+    end
+  end
+
+  ##
+  # A container for all the lines.
+
+  class Lines
+
+    include Enumerable
+
+    attr_reader :lines # :nodoc:
+
+    def initialize(lines)
+      @lines = lines
+      rewind
+    end
+
+    def empty?
+      @lines.size.zero?
+    end
+
+    def each
+      @lines.each do |line|
+        yield line unless line.deleted
+      end
+    end
+
+#    def [](index)
+#      @lines[index]
+#    end
+
+    def rewind
+      @nextline = 0
+    end
+
+    def next
+      begin
+        res = @lines[@nextline]
+        @nextline += 1 if @nextline < @lines.size
+      end while res and res.deleted and @nextline < @lines.size
+      res
+    end
+
+    def unget
+      @nextline -= 1
+    end
+
+    def delete(a_line)
+      a_line.deleted = true
+    end
+
+    def normalize
+      margin = @lines.collect{|l| l.leading_spaces}.min
+      margin = 0 if margin == :INFINITY
+      @lines.each {|line| line.strip_leading(margin) } if margin > 0
+    end
+
+    def as_text
+      @lines.map {|l| l.text}.join("\n")
+    end
+
+    def line_types
+      @lines.map {|l| l.type }
+    end
+
+  end
+
+end
+