From fe25aea9716b29fc02e61af096054ea665db9ee3 Mon Sep 17 00:00:00 2001
From: "zhanyong.wan" <zhanyong.wan@861a406c-534a-0410-8894-cb66d6ee9925>
Date: Tue, 9 Nov 2010 00:41:16 +0000
Subject: Fixes two pump.py bugs. One of them ("$range 1..n $$ comment" doesn't
 parse) was reported by user Aksai Chin.  Aksai also contributed a patch,
 which I didn't look at as I didn't want to bother him with signing the CLA. 
 Instead I wrote the fix from scratch.

---
 scripts/pump.py | 48 ++++++++++++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 18 deletions(-)

diff --git a/scripts/pump.py b/scripts/pump.py
index f15c1b6..8afe808 100755
--- a/scripts/pump.py
+++ b/scripts/pump.py
@@ -29,7 +29,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-"""pump v0.1 - Pretty Useful for Meta Programming.
+"""pump v0.2.0 - Pretty Useful for Meta Programming.
 
 A tool for preprocessor meta programming.  Useful for generating
 repetitive boilerplate code.  Especially useful for writing C++
@@ -78,7 +78,6 @@ TOKEN_TABLE = [
     (re.compile(r'\$range\s+'), '$range'),
     (re.compile(r'\$[_A-Za-z]\w*'), '$id'),
     (re.compile(r'\$\(\$\)'), '$($)'),
-    (re.compile(r'\$\$.*'), '$$'),
     (re.compile(r'\$'), '$'),
     (re.compile(r'\[\[\n?'), '[['),
     (re.compile(r'\]\]\n?'), ']]'),
@@ -224,6 +223,17 @@ def SubString(lines, start, end):
   return ''.join(result_lines)
 
 
+def StripMetaComments(str):
+  """Strip meta comments from each line in the given string."""
+
+  # First, completely remove lines containing nothing but a meta
+  # comment, including the trailing \n.
+  str = re.sub(r'^\s*\$\$.*\n', '', str)
+
+  # Then, remove meta comments from contentful lines.
+  return re.sub(r'\s*\$\$.*', '', str)
+
+
 def MakeToken(lines, start, end, token_type):
   """Creates a new instance of Token."""
 
@@ -311,11 +321,7 @@ def TokenizeLines(lines, pos):
       prev_token = MakeToken(lines, pos, found.start, 'code')
       prev_token_rstripped = RStripNewLineFromToken(prev_token)
 
-    if found.token_type == '$$':  # A meta comment.
-      if prev_token_rstripped:
-        yield prev_token_rstripped
-      pos = Cursor(found.end.line + 1, 0)
-    elif found.token_type == '$var':
+    if found.token_type == '$var':
       if prev_token_rstripped:
         yield prev_token_rstripped
       yield found
@@ -374,8 +380,11 @@ def TokenizeLines(lines, pos):
 
 
 def Tokenize(s):
-  lines = s.splitlines(True)
-  return TokenizeLines(lines, Cursor(0, 0))
+  """A generator that yields the tokens in the given string."""
+  if s != '':
+    lines = s.splitlines(True)
+    for token in TokenizeLines(lines, Cursor(0, 0)):
+      yield token
 
 
 class CodeNode:
@@ -565,11 +574,9 @@ def ParseCodeNode(tokens):
   return CodeNode(atomic_code_list)
 
 
-def Convert(file_path):
-  s = file(file_path, 'r').read()
-  tokens = []
-  for token in Tokenize(s):
-    tokens.append(token)
+def ParseToAST(pump_src_text):
+  """Convert the given Pump source text into an AST."""
+  tokens = list(Tokenize(pump_src_text))
   code_node = ParseCodeNode(tokens)
   return code_node
 
@@ -805,16 +812,21 @@ def BeautifyCode(string):
   return '\n'.join(output2) + '\n'
 
 
+def ConvertFromPumpSource(src_text):
+  """Return the text generated from the given Pump source text."""
+  ast = ParseToAST(StripMetaComments(src_text))
+  output = Output()
+  RunCode(Env(), ast, output)
+  return BeautifyCode(output.string)
+
+
 def main(argv):
   if len(argv) == 1:
     print __doc__
     sys.exit(1)
 
   file_path = argv[-1]
-  ast = Convert(file_path)
-  output = Output()
-  RunCode(Env(), ast, output)
-  output_str = BeautifyCode(output.string)
+  output_str = ConvertFromPumpSource(file(file_path, 'r').read())
   if file_path.endswith('.pump'):
     output_file_path = file_path[:-5]
   else:
-- 
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