77 def _ReadFiles(deps_file, item, library_name):  argument
79   item_files = item.get("files")
84     if item_files == None: item_files = item["files"] = set()
92       file_to_item[file_name] = item["name"]
94 def _IsLibrary(item): return item and item["type"] == "library"  argument
96 def _IsLibraryGroup(item): return item and "library" in item  argument
98 def _ReadDeps(deps_file, item, library_name):  argument
100   item_deps = item.get("deps")
105     if item_deps == None: item_deps = item["deps"] = set()
109       if item["type"] == "system_symbols" and (_IsLibraryGroup(dep_item) or _IsLibrary(dep_item)):
119 def _AddSystemSymbol(item, symbol):  argument
120   exports = item.get("system_symbols")
121   if exports == None: exports = item["system_symbols"] = set()
124 def _ReadSystemSymbols(deps_file, item):  argument
135         _AddSystemSymbol(item, symbol)
140       for symbol in line.split(): _AddSystemSymbol(item, symbol)
159         item = items[name] = {"type": "library", "name": name}
160         line = _ReadFiles(deps_file, item, name)
171         item = items[name]
172         item["name"] = name
173         library_name = item.get("library")
175           line = _ReadFiles(deps_file, item, library_name)
177           line = _ReadSystemSymbols(deps_file, item)
182           item = items[name]
183           line = _ReadDeps(deps_file, item, item.get("library"))
185           item = items[current_type]
186           line = _ReadDeps(deps_file, item, None)
193         item = items[current_type] = {"type": current_type, "name": current_type}
194         line = _ReadSystemSymbols(deps_file, item)