1 files changed, 155 insertions, 0 deletions
diff --git a/deps/gyp/tools/pretty_gyp.py b/deps/gyp/tools/pretty_gyp.py
new file mode 100755
index 0000000000..c51d35872c
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+++ b/deps/gyp/tools/pretty_gyp.py
@@ -0,0 +1,155 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Pretty-prints the contents of a GYP file."""
+
+import sys
+import re
+
+
+# Regex to remove comments when we're counting braces.
+COMMENT_RE = re.compile(r'\s*#.*')
+
+# Regex to remove quoted strings when we're counting braces.
+# It takes into account quoted quotes, and makes sure that the quotes match.
+# NOTE: It does not handle quotes that span more than one line, or
+# cases where an escaped quote is preceeded by an escaped backslash.
+QUOTE_RE_STR = r'(?P<q>[\'"])(.*?)(?<![^\\][\\])(?P=q)'
+QUOTE_RE = re.compile(QUOTE_RE_STR)
+
+
+def comment_replace(matchobj):
+  return matchobj.group(1) + matchobj.group(2) + '#' * len(matchobj.group(3))
+
+
+def mask_comments(input):
+  """Mask the quoted strings so we skip braces inside quoted strings."""
+  search_re = re.compile(r'(.*?)(#)(.*)')
+  return [search_re.sub(comment_replace, line) for line in input]
+
+
+def quote_replace(matchobj):
+  return "%s%s%s%s" % (matchobj.group(1),
+                       matchobj.group(2),
+                       'x'*len(matchobj.group(3)),
+                       matchobj.group(2))
+
+
+def mask_quotes(input):
+  """Mask the quoted strings so we skip braces inside quoted strings."""
+  search_re = re.compile(r'(.*?)' + QUOTE_RE_STR)
+  return [search_re.sub(quote_replace, line) for line in input]
+
+
+def do_split(input, masked_input, search_re):
+  output = []
+  mask_output = []
+  for (line, masked_line) in zip(input, masked_input):
+    m = search_re.match(masked_line)
+    while m:
+      split = len(m.group(1))
+      line = line[:split] + r'\n' + line[split:]
+      masked_line = masked_line[:split] + r'\n' + masked_line[split:]
+      m = search_re.match(masked_line)
+    output.extend(line.split(r'\n'))
+    mask_output.extend(masked_line.split(r'\n'))
+  return (output, mask_output)
+
+
+def split_double_braces(input):
+  """Masks out the quotes and comments, and then splits appropriate
+  lines (lines that matche the double_*_brace re's above) before
+  indenting them below.
+
+  These are used to split lines which have multiple braces on them, so
+  that the indentation looks prettier when all laid out (e.g. closing
+  braces make a nice diagonal line).
+  """
+  double_open_brace_re = re.compile(r'(.*?[\[\{\(,])(\s*)([\[\{\(])')
+  double_close_brace_re = re.compile(r'(.*?[\]\}\)],?)(\s*)([\]\}\)])')
+
+  masked_input = mask_quotes(input)
+  masked_input = mask_comments(masked_input)
+
+  (output, mask_output) = do_split(input, masked_input, double_open_brace_re)
+  (output, mask_output) = do_split(output, mask_output, double_close_brace_re)
+
+  return output
+
+
+def count_braces(line):
+  """keeps track of the number of braces on a given line and returns the result.
+
+  It starts at zero and subtracts for closed braces, and adds for open braces.
+  """
+  open_braces = ['[', '(', '{']
+  close_braces = [']', ')', '}']
+  closing_prefix_re = re.compile(r'(.*?[^\s\]\}\)]+.*?)([\]\}\)],?)\s*$')
+  cnt = 0
+  stripline = COMMENT_RE.sub(r'', line)
+  stripline = QUOTE_RE.sub(r"''", stripline)
+  for char in stripline:
+    for brace in open_braces:
+      if char == brace:
+        cnt += 1
+    for brace in close_braces:
+      if char == brace:
+        cnt -= 1
+
+  after = False
+  if cnt > 0:
+    after = True
+
+  # This catches the special case of a closing brace having something
+  # other than just whitespace ahead of it -- we don't want to
+  # unindent that until after this line is printed so it stays with
+  # the previous indentation level.
+  if cnt < 0 and closing_prefix_re.match(stripline):
+    after = True
+  return (cnt, after)
+
+
+def prettyprint_input(lines):
+  """Does the main work of indenting the input based on the brace counts."""
+  indent = 0
+  basic_offset = 2
+  last_line = ""
+  for line in lines:
+    if COMMENT_RE.match(line):
+      print line
+    else:
+      line = line.strip('\r\n\t ')  # Otherwise doesn't strip \r on Unix.
+      if len(line) > 0:
+        (brace_diff, after) = count_braces(line)
+        if brace_diff != 0:
+          if after:
+            print " " * (basic_offset * indent) + line
+            indent += brace_diff
+          else:
+            indent += brace_diff
+            print " " * (basic_offset * indent) + line
+        else:
+          print " " * (basic_offset * indent) + line
+      else:
+        print ""
+      last_line = line
+
+
+def main():
+  if len(sys.argv) > 1:
+    data = open(sys.argv[1]).read().splitlines()
+  else:
+    data = sys.stdin.read().splitlines()
+  # Split up the double braces.
+  lines = split_double_braces(data)
+
+  # Indent and print the output.
+  prettyprint_input(lines)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())