added the first chapter of beautiful code as a coffeescript example

examples/beautiful_code/regular_expression_matcher.coffee

@@ -0,0 +1,34 @@
+# Beautiful Code, chapter 1.
+# Implements a regular expression matcher that supports characters,
+# '.', '^', '$', and '*'.
+
+# Search for the regexp anywhere in the text.
+match: regexp, text =>
+  return match_here(regexp.slice(1), text) if regexp[0] is '^'
+  while text
+    return true if match_here(regexp, text)
+    text: text.slice(1)
+  false
+
+# Search for the regexp at the beginning of the text.
+match_here: regexp, text =>
+  [cur, next]: [regexp[0], regexp[1]]
+  if regexp.length is 0 then return true
+  if next is '*' then return match_star(cur, regexp.slice(2), text)
+  if cur is '$' and not next then return text.length is 0
+  if text and (cur is '.' or cur is text[0]) then return match_here(regexp.slice(1), text.slice(1))
+  false
+
+# Search for a kleene star match at the beginning of the text.
+match_star: c, regexp, text =>
+  while true
+    return true if match_here(regexp, text)
+    return false unless text and (text[0] is c or c is '.')
+    text: text.slice(1)
+
+print(match("ex", "some text"))
+print(match("s..t", "spit"))
+print(match("^..t", "buttercup"))
+print(match("i..$", "cherries"))
+print(match("o*m", "vrooooommm!"))
+print(match("^hel*o$", "hellllllo"))

test/unit/test_execution.rb

@@ -4,12 +4,16 @@ class ExecutionTest < Test::Unit::TestCase
 
   NO_WARNINGS = "0 error(s), 0 warning(s)"
 
+  SOURCES = [
+    'test/fixtures/execution/*.coffee',
+    'examples/beautiful_code/*.coffee'
+  ]
+
   # This is by far the most important test. It evaluates all of the
-  # CoffeeScript in test/fixtures/execution, ensuring that all our
-  # syntax actually works.
+  # CoffeeScript in test/fixtures/execution, as well as examples/beautiful_code,
+  # ensuring that all our syntax actually works.
   def test_execution_of_coffeescript
-    sources = ['test/fixtures/execution/*.coffee'].join(' ')
-    (`bin/coffee -r #{sources}`).split("\n").each do |line|
+    (`bin/coffee -r #{SOURCES.join(' ')}`).split("\n").each do |line|
       assert line == "true"
     end
   end