75 def _ReadFiles(deps_file, item, library_name):  argument
77   item_files = item.get("files")
82     if item_files == None: item_files = item["files"] = set()
90       file_to_item[file_name] = item["name"]
92 def _IsLibrary(item): return item and item["type"] == "library"  argument
94 def _IsLibraryGroup(item): return item and "library" in item  argument
96 def _ReadDeps(deps_file, item, library_name):  argument
98   item_deps = item.get("deps")
103     if item_deps == None: item_deps = item["deps"] = set()
107       if item["type"] == "system_symbols" and (_IsLibraryGroup(dep_item) or _IsLibrary(dep_item)):
117 def _AddSystemSymbol(item, symbol):  argument
118   exports = item.get("system_symbols")
119   if exports == None: exports = item["system_symbols"] = set()
122 def _ReadSystemSymbols(deps_file, item):  argument
133         _AddSystemSymbol(item, symbol)
138       for symbol in line.split(): _AddSystemSymbol(item, symbol)
157         item = items[name] = {"type": "library", "name": name}
158         line = _ReadFiles(deps_file, item, name)
169         item = items[name]
170         item["name"] = name
171         library_name = item.get("library")
173           line = _ReadFiles(deps_file, item, library_name)
175           line = _ReadSystemSymbols(deps_file, item)
180           item = items[name]
181           line = _ReadDeps(deps_file, item, item.get("library"))
183           item = items[current_type]
184           line = _ReadDeps(deps_file, item, None)
191         item = items[current_type] = {"type": current_type, "name": current_type}
192         line = _ReadSystemSymbols(deps_file, item)