1 files changed, 157 insertions, 0 deletions
diff --git a/deps/gyp/pylib/gyp/easy_xml.py b/deps/gyp/pylib/gyp/easy_xml.py
new file mode 100644
index 0000000000..bf949b6ac9
--- /dev/null
+++ b/deps/gyp/pylib/gyp/easy_xml.py
@@ -0,0 +1,157 @@
+# Copyright (c) 2011 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.
+
+import re
+import os
+
+
+def XmlToString(content, encoding='utf-8', pretty=False):
+  """ Writes the XML content to disk, touching the file only if it has changed.
+
+  Visual Studio files have a lot of pre-defined structures.  This function makes
+  it easy to represent these structures as Python data structures, instead of
+  having to create a lot of function calls.
+
+  Each XML element of the content is represented as a list composed of:
+  1. The name of the element, a string,
+  2. The attributes of the element, a dictionary (optional), and
+  3+. The content of the element, if any.  Strings are simple text nodes and
+      lists are child elements.
+
+  Example 1:
+      <test/>
+  becomes
+      ['test']
+
+  Example 2:
+      <myelement a='value1' b='value2'>
+         <childtype>This is</childtype>
+         <childtype>it!</childtype>
+      </myelement>
+
+  becomes
+      ['myelement', {'a':'value1', 'b':'value2'},
+         ['childtype', 'This is'],
+         ['childtype', 'it!'],
+      ]
+
+  Args:
+    content:  The structured content to be converted.
+    encoding: The encoding to report on the first XML line.
+    pretty: True if we want pretty printing with indents and new lines.
+
+  Returns:
+    The XML content as a string.
+  """
+  # We create a huge list of all the elements of the file.
+  xml_parts = ['<?xml version="1.0" encoding="%s"?>' % encoding]
+  if pretty:
+    xml_parts.append('\n')
+  _ConstructContentList(xml_parts, content, pretty)
+
+  # Convert it to a string
+  return ''.join(xml_parts)
+
+
+def _ConstructContentList(xml_parts, specification, pretty, level=0):
+  """ Appends the XML parts corresponding to the specification.
+
+  Args:
+    xml_parts: A list of XML parts to be appended to.
+    specification:  The specification of the element.  See EasyXml docs.
+    pretty: True if we want pretty printing with indents and new lines.
+    level: Indentation level.
+  """
+  # The first item in a specification is the name of the element.
+  if pretty:
+    indentation = '  ' * level
+    new_line = '\n'
+  else:
+    indentation = ''
+    new_line = ''
+  name = specification[0]
+  if not isinstance(name, str):
+    raise Exception('The first item of an EasyXml specification should be '
+                    'a string.  Specification was ' + str(specification))
+  xml_parts.append(indentation + '<' + name)
+
+  # Optionally in second position is a dictionary of the attributes.
+  rest = specification[1:]
+  if rest and isinstance(rest[0], dict):
+    for at, val in sorted(rest[0].iteritems()):
+      xml_parts.append(' %s="%s"' % (at, _XmlEscape(val, attr=True)))
+    rest = rest[1:]
+  if rest:
+    xml_parts.append('>')
+    all_strings = reduce(lambda x, y: x and isinstance(y, str), rest, True)
+    multi_line = not all_strings
+    if multi_line and new_line:
+      xml_parts.append(new_line)
+    for child_spec in rest:
+      # If it's a string, append a text node.
+      # Otherwise recurse over that child definition
+      if isinstance(child_spec, str):
+       xml_parts.append(_XmlEscape(child_spec))
+      else:
+        _ConstructContentList(xml_parts, child_spec, pretty, level + 1)
+    if multi_line and indentation:
+      xml_parts.append(indentation)
+    xml_parts.append('</%s>%s' % (name, new_line))
+  else:
+    xml_parts.append('/>%s' % new_line)
+
+
+def WriteXmlIfChanged(content, path, encoding='utf-8', pretty=False,
+                      win32=False):
+  """ Writes the XML content to disk, touching the file only if it has changed.
+
+  Args:
+    content:  The structured content to be written.
+    path: Location of the file.
+    encoding: The encoding to report on the first line of the XML file.
+    pretty: True if we want pretty printing with indents and new lines.
+  """
+  xml_string = XmlToString(content, encoding, pretty)
+  if win32 and os.linesep != '\r\n':
+    xml_string = xml_string.replace('\n', '\r\n')
+
+  # Get the old content
+  try:
+    f = open(path, 'r')
+    existing = f.read()
+    f.close()
+  except:
+    existing = None
+
+  # It has changed, write it
+  if existing != xml_string:
+    f = open(path, 'w')
+    f.write(xml_string)
+    f.close()
+
+
+_xml_escape_map = {
+    '"': '&quot;',
+    "'": '&apos;',
+    '<': '&lt;',
+    '>': '&gt;',
+    '&': '&amp;',
+    '\n': '&#xA;',
+    '\r': '&#xD;',
+}
+
+
+_xml_escape_re = re.compile(
+    "(%s)" % "|".join(map(re.escape, _xml_escape_map.keys())))
+
+
+def _XmlEscape(value, attr=False):
+  """ Escape a string for inclusion in XML."""
+  def replace(match):
+    m = match.string[match.start() : match.end()]
+    # don't replace single quotes in attrs
+    if attr and m == "'":
+      return m
+    return _xml_escape_map[m]
+  return _xml_escape_re.sub(replace, value)