Imported Upstream version 1HEADmaster

1 files changed, 112 insertions, 0 deletions

diff --git a/samples/expert-irb.rb b/samples/expert-irb.rb
new file mode 100644
index 0000000..8960ef7
--- /dev/null
+++ b/samples/expert-irb.rb
@@ -0,0 +1,112 @@
+require 'irb/ruby-lex'
+require 'stringio'
+
+class MimickIRB < RubyLex
+  attr_accessor :started
+
+  class Continue < StandardError; end
+  class Empty < StandardError; end
+
+  def initialize
+    super
+    set_input(StringIO.new)
+  end
+
+  def run(str)
+    obj = nil
+    @io << str
+    @io.rewind
+    unless l = lex
+      raise Empty if @line == ''
+    else
+      case l.strip
+      when "reset"
+        @line = ""
+      when "time"
+        @line = "puts %{You started \#{IRBalike.started.since} ago.}"
+      else
+        @line << l << "\n"
+        if @ltype or @continue or @indent > 0
+          raise Continue
+        end
+      end
+    end
+    unless @line.empty?
+      obj = eval @line, TOPLEVEL_BINDING, "(irb)", @line_no
+    end
+    @line_no += @line.scan(/\n/).length
+    @line = ''
+    @exp_line_no = @line_no
+
+    @indent = 0
+    @indent_stack = []
+
+    $stdout.rewind
+    output = $stdout.read
+    $stdout.truncate(0)
+    $stdout.rewind
+    [output, obj]
+  rescue Object => e
+    case e when Empty, Continue
+    else @line = ""
+    end
+    raise e
+  ensure
+    set_input(StringIO.new)
+  end
+
+end
+
+CURSOR = ">>"
+IRBalike = MimickIRB.new
+$stdout = StringIO.new
+
+Shoes.app do
+  @str, @cmd = [CURSOR + " "], ""
+  stack :width => 1.0, :height => 1.0 do
+    background "#555"
+    stack :width => 1.0, :height => 50 do
+      para "Interactive Ruby ready.", :fill => white, :stroke => red
+    end
+    @scroll =
+      stack :width => 1.0, :height => -50, :scroll => true do
+        background "#555"
+        @console = para @str, :font => "Monospace 12px", :stroke => "#dfa"
+        @console.cursor = -1
+      end
+  end
+  keypress do |k|
+    case k
+    when "\n"
+      begin
+        out, obj = IRBalike.run(@cmd + ';')
+        @str += ["#@cmd\n",
+          span("#{out}=> #{obj.inspect}\n", :stroke => "#fda"),
+          "#{CURSOR} "]
+        @cmd = ""
+      rescue MimickIRB::Empty
+      rescue MimickIRB::Continue
+        @str += ["#@cmd\n.. "]
+        @cmd = ""
+      rescue Object => e
+        @str += ["#@cmd\n", span("#{e.class}: #{e.message}\n", :stroke => "#fcf"),
+          "#{CURSOR} "]
+        @cmd = ""
+      end
+    when String
+      @cmd += k
+    when :backspace
+      @cmd.slice!(-1)
+    when :tab
+      @cmd += "  "
+    when :alt_q
+      quit
+    when :alt_c
+      self.clipboard = @cmd
+    when :alt_v
+      @cmd += self.clipboard
+    end
+    @console.replace *(@str + [@cmd])
+    @scroll.scroll_top = @scroll.scroll_max
+  end
+end