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, 616 insertions, 0 deletions

diff --git a/trunk/lib/rdoc/ri/formatter.rb b/trunk/lib/rdoc/ri/formatter.rb
new file mode 100644
index 0000000000..0a0c3f7380
--- /dev/null
+++ b/trunk/lib/rdoc/ri/formatter.rb
@@ -0,0 +1,616 @@
+require 'rdoc/ri'
+require 'rdoc/markup'
+
+class RDoc::RI::Formatter
+
+  attr_writer :indent
+  attr_accessor :output
+
+  FORMATTERS = { }
+
+  def self.for(name)
+    FORMATTERS[name.downcase]
+  end
+
+  def self.list
+    FORMATTERS.keys.sort.join ", "
+  end
+
+  def initialize(output, width, indent)
+    @output = output
+    @width  = width
+    @indent = indent
+    @original_indent = indent.dup
+  end
+
+  def draw_line(label=nil)
+    len = @width
+    len -= (label.size + 1) if label
+
+    if len > 0 then
+      @output.print '-' * len
+      if label
+        @output.print ' '
+        bold_print label
+      end
+
+      @output.puts
+    else
+      @output.print '-' * @width
+      @output.puts
+
+      @output.puts label
+    end
+  end
+
+  def indent
+    return @indent unless block_given?
+
+    begin
+      indent = @indent.dup
+      @indent += @original_indent
+      yield
+    ensure
+      @indent = indent
+    end
+  end
+
+  def wrap(txt, prefix=@indent, linelen=@width)
+    return unless txt && !txt.empty?
+
+    work = conv_markup(txt)
+    textLen = linelen - prefix.length
+    patt = Regexp.new("^(.{0,#{textLen}})[ \n]")
+    next_prefix = prefix.tr("^ ", " ")
+
+    res = []
+
+    while work.length > textLen
+      if work =~ patt
+        res << $1
+        work.slice!(0, $&.length)
+      else
+        res << work.slice!(0, textLen)
+      end
+    end
+    res << work if work.length.nonzero?
+    @output.puts(prefix + res.join("\n" + next_prefix))
+  end
+
+  def blankline
+    @output.puts
+  end
+
+  ##
+  # Called when we want to ensure a new 'wrap' starts on a newline.  Only
+  # needed for HtmlFormatter, because the rest do their own line breaking.
+
+  def break_to_newline
+  end
+
+  def bold_print(txt)
+    @output.print txt
+  end
+
+  def raw_print_line(txt)
+    @output.puts txt
+  end
+
+  ##
+  # Convert HTML entities back to ASCII
+
+  def conv_html(txt)
+    txt = txt.gsub(/&gt;/, '>')
+    txt.gsub!(/&lt;/, '<')
+    txt.gsub!(/&quot;/, '"')
+    txt.gsub!(/&amp;/, '&')
+    txt
+  end
+
+  ##
+  # Convert markup into display form
+
+  def conv_markup(txt)
+    txt = txt.gsub(%r{<tt>(.*?)</tt>}, '+\1+')
+    txt.gsub!(%r{<code>(.*?)</code>}, '+\1+')
+    txt.gsub!(%r{<b>(.*?)</b>}, '*\1*')
+    txt.gsub!(%r{<em>(.*?)</em>}, '_\1_') 
+    txt
+  end
+
+  def display_list(list)
+    case list.type
+    when :BULLET
+      prefixer = proc { |ignored| @indent + "*   " }
+
+    when :NUMBER, :UPPERALPHA, :LOWERALPHA then
+      start = case list.type
+              when :NUMBER     then 1
+              when :UPPERALPHA then 'A'
+              when :LOWERALPHA then 'a'
+              end
+
+      prefixer = proc do |ignored|
+        res = @indent + "#{start}.".ljust(4)
+        start = start.succ
+        res
+      end
+
+    when :LABELED, :NOTE then
+      longest = 0
+
+      list.contents.each do |item|
+        if RDoc::Markup::Flow::LI === item and item.label.length > longest then
+          longest = item.label.length
+        end
+      end
+
+      longest += 1
+
+      prefixer = proc { |li| @indent + li.label.ljust(longest) }
+
+    else
+      raise ArgumentError, "unknown list type #{list.type}"
+    end
+
+    list.contents.each do |item|
+      if RDoc::Markup::Flow::LI === item then
+        prefix = prefixer.call item
+        display_flow_item item, prefix
+      else
+        display_flow_item item
+      end
+    end
+  end
+
+  def display_flow_item(item, prefix = @indent)
+    case item
+    when RDoc::Markup::Flow::P, RDoc::Markup::Flow::LI
+      wrap(conv_html(item.body), prefix)
+      blankline
+
+    when RDoc::Markup::Flow::LIST
+      display_list(item)
+
+    when RDoc::Markup::Flow::VERB
+      display_verbatim_flow_item(item, @indent)
+
+    when RDoc::Markup::Flow::H
+      display_heading(conv_html(item.text), item.level, @indent)
+
+    when RDoc::Markup::Flow::RULE
+      draw_line
+
+    else
+      raise RDoc::Error, "Unknown flow element: #{item.class}"
+    end
+  end
+
+  def display_verbatim_flow_item(item, prefix=@indent)
+    item.body.split(/\n/).each do |line|
+      @output.print @indent, conv_html(line), "\n"
+    end
+    blankline
+  end
+
+  def display_heading(text, level, indent)
+    text = strip_attributes text
+
+    case level
+    when 1 then
+      ul = "=" * text.length
+      @output.puts
+      @output.puts text.upcase
+      @output.puts ul
+
+    when 2 then
+      ul = "-" * text.length
+      @output.puts
+      @output.puts text
+      @output.puts ul
+    else
+      @output.print indent, text, "\n"
+    end
+
+    @output.puts
+  end
+
+  def display_flow(flow)
+    flow.each do |f|
+      display_flow_item(f)
+    end
+  end
+
+  def strip_attributes(text)
+    text.gsub(/(<\/?(?:b|code|em|i|tt)>)/, '')
+  end
+
+end
+
+##
+# Handle text with attributes. We're a base class: there are different
+# presentation classes (one, for example, uses overstrikes to handle bold and
+# underlining, while another using ANSI escape sequences.
+
+class RDoc::RI::AttributeFormatter < RDoc::RI::Formatter
+
+  BOLD      = 1
+  ITALIC    = 2
+  CODE      = 4
+
+  ATTR_MAP = {
+    "b"    => BOLD,
+    "code" => CODE,
+    "em"   => ITALIC,
+    "i"    => ITALIC,
+    "tt"   => CODE
+  }
+
+  AttrChar = Struct.new :char, :attr
+
+  class AttributeString
+    attr_reader :txt
+
+    def initialize
+      @txt = []
+      @optr = 0
+    end
+
+    def <<(char)
+      @txt << char
+    end
+
+    def empty?
+      @optr >= @txt.length
+    end
+
+    # accept non space, then all following spaces
+    def next_word
+      start = @optr
+      len = @txt.length
+
+      while @optr < len && @txt[@optr].char != " "
+        @optr += 1
+      end
+
+      while @optr < len && @txt[@optr].char == " "
+        @optr += 1
+      end
+
+      @txt[start...@optr]
+    end
+  end
+
+  ##
+  # Overrides base class.  Looks for <tt>...</tt> etc sequences and generates
+  # an array of AttrChars.  This array is then used as the basis for the
+  # split.
+
+  def wrap(txt, prefix=@indent, linelen=@width)
+    return unless txt && !txt.empty?
+
+    txt = add_attributes_to(txt)
+    next_prefix = prefix.tr("^ ", " ")
+    linelen -= prefix.size
+
+    line = []
+
+    until txt.empty?
+      word = txt.next_word
+      if word.size + line.size > linelen
+        write_attribute_text(prefix, line)
+        prefix = next_prefix
+        line = []
+      end
+      line.concat(word)
+    end
+
+    write_attribute_text(prefix, line) if line.length > 0
+  end
+
+  protected
+
+  def write_attribute_text(prefix, line)
+    @output.print prefix
+    line.each do |achar|
+      @output.print achar.char
+    end
+    @output.puts
+  end
+
+  def bold_print(txt)
+    @output.print txt
+  end
+
+  private
+
+  def add_attributes_to(txt)
+    tokens = txt.split(%r{(</?(?:b|code|em|i|tt)>)})
+    text = AttributeString.new
+    attributes = 0
+    tokens.each do |tok|
+      case tok
+      when %r{^</(\w+)>$} then attributes &= ~(ATTR_MAP[$1]||0)
+      when %r{^<(\w+)>$}  then attributes  |= (ATTR_MAP[$1]||0)
+      else
+        tok.split(//).each {|ch| text << AttrChar.new(ch, attributes)}
+      end
+    end
+    text
+  end
+
+end
+
+##
+# This formatter generates overstrike-style formatting, which works with
+# pagers such as man and less.
+
+class RDoc::RI::OverstrikeFormatter < RDoc::RI::AttributeFormatter
+
+  BS = "\C-h"
+
+  def write_attribute_text(prefix, line)
+    @output.print prefix
+
+    line.each do |achar|
+      attr = achar.attr
+      @output.print "_", BS if (attr & (ITALIC + CODE)) != 0
+      @output.print achar.char, BS if (attr & BOLD) != 0
+      @output.print achar.char
+    end
+
+    @output.puts
+  end
+
+  ##
+  # Draw a string in bold
+
+  def bold_print(text)
+    text.split(//).each do |ch|
+      @output.print ch, BS, ch
+    end
+  end
+
+end
+
+##
+# This formatter uses ANSI escape sequences to colorize stuff works with
+# pagers such as man and less.
+
+class RDoc::RI::AnsiFormatter < RDoc::RI::AttributeFormatter
+
+  def initialize(*args)
+    super
+    @output.print "\033[0m"
+  end
+
+  def write_attribute_text(prefix, line)
+    @output.print prefix
+    curr_attr = 0
+    line.each do |achar|
+      attr = achar.attr
+      if achar.attr != curr_attr
+        update_attributes(achar.attr)
+        curr_attr = achar.attr
+      end
+      @output.print achar.char
+    end
+    update_attributes(0) unless curr_attr.zero?
+    @output.puts
+  end
+
+  def bold_print(txt)
+    @output.print "\033[1m#{txt}\033[m"
+  end
+
+  HEADINGS = {
+    1 => ["\033[1;32m", "\033[m"],
+    2 => ["\033[4;32m", "\033[m"],
+    3 => ["\033[32m",   "\033[m"],
+  }
+
+  def display_heading(text, level, indent)
+    level = 3 if level > 3
+    heading = HEADINGS[level]
+    @output.print indent
+    @output.print heading[0]
+    @output.print strip_attributes(text)
+    @output.puts heading[1]
+  end
+
+  private
+
+  ATTR_MAP = {
+    BOLD   => "1",
+    ITALIC => "33",
+    CODE   => "36"
+  }
+
+  def update_attributes(attr)
+    str = "\033["
+    for quality in [ BOLD, ITALIC, CODE]
+      unless (attr & quality).zero?
+        str << ATTR_MAP[quality]
+      end
+    end
+    @output.print str, "m"
+  end
+
+end
+
+##
+# This formatter uses HTML.
+
+class RDoc::RI::HtmlFormatter < RDoc::RI::AttributeFormatter
+
+  def write_attribute_text(prefix, line)
+    curr_attr = 0
+    line.each do |achar|
+      attr = achar.attr
+      if achar.attr != curr_attr
+        update_attributes(curr_attr, achar.attr)
+        curr_attr = achar.attr
+      end
+      @output.print(escape(achar.char))
+    end
+    update_attributes(curr_attr, 0) unless curr_attr.zero?
+  end
+
+  def draw_line(label=nil)
+    if label != nil
+      bold_print(label)
+    end
+    @output.puts("<hr>")
+  end
+
+  def bold_print(txt)
+    tag("b") { txt }
+  end
+
+  def blankline()
+    @output.puts("<p>")
+  end
+
+  def break_to_newline
+    @output.puts("<br>")
+  end
+
+  def display_heading(text, level, indent)
+    level = 4 if level > 4
+    tag("h#{level}") { text }
+    @output.puts
+  end
+
+  def display_list(list)
+    case list.type
+    when :BULLET then
+      list_type = "ul"
+      prefixer = proc { |ignored| "<li>" }
+
+    when :NUMBER, :UPPERALPHA, :LOWERALPHA then
+      list_type = "ol"
+      prefixer = proc { |ignored| "<li>" }
+
+    when :LABELED then
+      list_type = "dl"
+      prefixer = proc do |li|
+        "<dt><b>" + escape(li.label) + "</b><dd>"
+      end
+
+    when :NOTE then
+      list_type = "table"
+      prefixer = proc do |li|
+        %{<tr valign="top"><td>#{li.label.gsub(/ /, '&nbsp;')}</td><td>}
+      end
+    else
+      fail "unknown list type"
+    end
+
+    @output.print "<#{list_type}>"
+    list.contents.each do |item|
+      if item.kind_of? RDoc::Markup::Flow::LI
+        prefix = prefixer.call(item)
+        @output.print prefix
+        display_flow_item(item, prefix)
+      else
+        display_flow_item(item)
+      end
+    end
+    @output.print "</#{list_type}>"
+  end
+
+  def display_verbatim_flow_item(item, prefix=@indent)
+    @output.print("<pre>")
+    item.body.split(/\n/).each do |line|
+      @output.puts conv_html(line)
+    end
+    @output.puts("</pre>")
+  end
+
+  private
+
+  ATTR_MAP = {
+    BOLD   => "b>",
+    ITALIC => "i>",
+    CODE   => "tt>"
+  }
+
+  def update_attributes(current, wanted)
+    str = ""
+    # first turn off unwanted ones
+    off = current & ~wanted
+    for quality in [ BOLD, ITALIC, CODE]
+      if (off & quality) > 0
+        str << "</" + ATTR_MAP[quality]
+      end
+    end
+
+    # now turn on wanted
+    for quality in [ BOLD, ITALIC, CODE]
+      unless (wanted & quality).zero?
+        str << "<" << ATTR_MAP[quality]
+      end
+    end
+    @output.print str
+  end
+
+  def tag(code)
+    @output.print("<#{code}>")
+    @output.print(yield)
+    @output.print("</#{code}>")
+  end
+
+  def escape(str)
+    str = str.gsub(/&/n, '&amp;')
+    str.gsub!(/\"/n, '&quot;')
+    str.gsub!(/>/n, '&gt;')
+    str.gsub!(/</n, '&lt;')
+    str
+  end
+
+end
+
+##
+# This formatter reduces extra lines for a simpler output.  It improves way
+# output looks for tools like IRC bots.
+
+class RDoc::RI::SimpleFormatter < RDoc::RI::Formatter
+
+  ##
+  # No extra blank lines
+
+  def blankline
+  end
+
+  ##
+  # Display labels only, no lines
+
+  def draw_line(label=nil)
+    unless label.nil? then
+      bold_print(label)
+      @output.puts
+    end
+  end
+
+  ##
+  # Place heading level indicators inline with heading.
+
+  def display_heading(text, level, indent)
+    text = strip_attributes(text)
+    case level
+    when 1
+      @output.puts "= " + text.upcase
+    when 2
+      @output.puts "-- " + text
+    else
+      @output.print indent, text, "\n"
+    end
+  end
+
+end
+
+RDoc::RI::Formatter::FORMATTERS['plain']  = RDoc::RI::Formatter
+RDoc::RI::Formatter::FORMATTERS['simple'] = RDoc::RI::SimpleFormatter
+RDoc::RI::Formatter::FORMATTERS['bs']     = RDoc::RI::OverstrikeFormatter
+RDoc::RI::Formatter::FORMATTERS['ansi']   = RDoc::RI::AnsiFormatter
+RDoc::RI::Formatter::FORMATTERS['html']   = RDoc::RI::HtmlFormatter