Closure compile JS files with GYP.

third_party/closure_compiler/processor.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from collections import defaultdict
+import re
+import os
+
+
+class LineNumber(object):
+  def __init__(self, file, line_number):
+    self.file = file
+    self.line_number = int(line_number)
+
+
+class FileCache(object):
+  _cache = defaultdict(str)
+
+  def _read(self, file):
+    file = os.path.abspath(file)
+    self._cache[file] = self._cache[file] or open(file, "r").read()
+    return self._cache[file]
+
+  @staticmethod
+  def read(file):
+    return FileCache()._read(file)
+
+
+class Processor(object):
+  _IF_TAGS_REG = "</?if[^>]*?>"
+  _INCLUDE_REG = "<include[^>]+src=['\"]([^>]*)['\"]>"
+
+  def __init__(self, file):
+    self._included_files = set()
+    self._index = 0
+    self._lines = self._get_file(file)
+
+    while self._index < len(self._lines):
+      current_line = self._lines[self._index]
+      match = re.search(self._INCLUDE_REG, current_line[2])
+      if match:
+        file_dir = os.path.dirname(current_line[0])
+        self._include_file(os.path.join(file_dir, match.group(1)))
+      else:
+        self._index += 1
+
+    for i, line in enumerate(self._lines):
+      self._lines[i] = line[:2] + (re.sub(self._IF_TAGS_REG, "", line[2]),)
+
+    self.contents = "\n".join(l[2] for l in self._lines)
+
+  # Returns a list of tuples in the format: (file, line number, line contents).
+  def _get_file(self, file):
+    lines = FileCache.read(file).splitlines()
+    return [(file, lnum + 1, line) for lnum, line in enumerate(lines)]
+
+  def _include_file(self, file):
+    self._included_files.add(file)
+    f = self._get_file(file)
+    self._lines = self._lines[:self._index] + f + self._lines[self._index + 1:]
+
+  def get_file_from_line(self, line_number):
+    line_number = int(line_number) - 1
+    return LineNumber(self._lines[line_number][0], self._lines[line_number][1])
+
+  def included_files(self):
+    return self._included_files