Import of the watch repository from Pebble

third_party/waf/waf-light/waflib/ConfigSet.py

@@ -0,0 +1,342 @@
+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2005-2010 (ita)
+
+"""
+
+ConfigSet: a special dict
+
+The values put in :py:class:`ConfigSet` must be lists
+"""
+
+import copy, re, os
+from waflib import Logs, Utils
+re_imp = re.compile('^(#)*?([^#=]*?)\ =\ (.*?)$', re.M)
+
+class ConfigSet(object):
+	"""
+	A dict that honor serialization and parent relationships. The serialization format
+	is human-readable (python-like) and performed by using eval() and repr().
+	For high performance prefer pickle. Do not store functions as they are not serializable.
+
+	The values can be accessed by attributes or by keys::
+
+		from waflib.ConfigSet import ConfigSet
+		env = ConfigSet()
+		env.FOO = 'test'
+		env['FOO'] = 'test'
+	"""
+	__slots__ = ('table', 'parent')
+	def __init__(self, filename=None):
+		self.table = {}
+		"""
+		Internal dict holding the object values
+		"""
+		#self.parent = None
+
+		if filename:
+			self.load(filename)
+
+	def __contains__(self, key):
+		"""
+		Enable the *in* syntax::
+
+			if 'foo' in env:
+				print(env['foo'])
+		"""
+		if key in self.table: return True
+		try: return self.parent.__contains__(key)
+		except AttributeError: return False # parent may not exist
+
+	def keys(self):
+		"""Dict interface (unknown purpose)"""
+		keys = set()
+		cur = self
+		while cur:
+			keys.update(cur.table.keys())
+			cur = getattr(cur, 'parent', None)
+		keys = list(keys)
+		keys.sort()
+		return keys
+
+	def __str__(self):
+		"""Text representation of the ConfigSet (for debugging purposes)"""
+		return "\n".join(["%r %r" % (x, self.__getitem__(x)) for x in self.keys()])
+
+	def __getitem__(self, key):
+		"""
+		Dictionary interface: get value from key::
+
+			def configure(conf):
+				conf.env['foo'] = {}
+				print(env['foo'])
+		"""
+		try:
+			while 1:
+				x = self.table.get(key, None)
+				if not x is None:
+					return x
+				self = self.parent
+		except AttributeError:
+			return []
+
+	def __setitem__(self, key, value):
+		"""
+		Dictionary interface: get value from key
+		"""
+		self.table[key] = value
+
+	def __delitem__(self, key):
+		"""
+		Dictionary interface: get value from key
+		"""
+		self[key] = []
+
+	def __getattr__(self, name):
+		"""
+		Attribute access provided for convenience. The following forms are equivalent::
+
+			def configure(conf):
+				conf.env.value
+				conf.env['value']
+		"""
+		if name in self.__slots__:
+			return object.__getattr__(self, name)
+		else:
+			return self[name]
+
+	def __setattr__(self, name, value):
+		"""
+		Attribute access provided for convenience. The following forms are equivalent::
+
+			def configure(conf):
+				conf.env.value = x
+				env['value'] = x
+		"""
+		if name in self.__slots__:
+			object.__setattr__(self, name, value)
+		else:
+			self[name] = value
+
+	def __delattr__(self, name):
+		"""
+		Attribute access provided for convenience. The following forms are equivalent::
+
+			def configure(conf):
+				del env.value
+				del env['value']
+		"""
+		if name in self.__slots__:
+			object.__delattr__(self, name)
+		else:
+			del self[name]
+
+	def derive(self):
+		"""
+		Returns a new ConfigSet deriving from self. The copy returned
+		will be a shallow copy::
+
+			from waflib.ConfigSet import ConfigSet
+			env = ConfigSet()
+			env.append_value('CFLAGS', ['-O2'])
+			child = env.derive()
+			child.CFLAGS.append('test') # warning! this will modify 'env'
+			child.CFLAGS = ['-O3'] # new list, ok
+			child.append_value('CFLAGS', ['-O3']) # ok
+
+		Use :py:func:`ConfigSet.detach` to detach the child from the parent.
+		"""
+		newenv = ConfigSet()
+		newenv.parent = self
+		return newenv
+
+	def detach(self):
+		"""
+		Detach self from its parent (if existing)
+
+		Modifying the parent :py:class:`ConfigSet` will not change the current object
+		Modifying this :py:class:`ConfigSet` will not modify the parent one.
+		"""
+		tbl = self.get_merged_dict()
+		try:
+			delattr(self, 'parent')
+		except AttributeError:
+			pass
+		else:
+			keys = tbl.keys()
+			for x in keys:
+				tbl[x] = copy.deepcopy(tbl[x])
+			self.table = tbl
+
+	def get_flat(self, key):
+		"""
+		Return a value as a string. If the input is a list, the value returned is space-separated.
+
+		:param key: key to use
+		:type key: string
+		"""
+		s = self[key]
+		if isinstance(s, str): return s
+		return ' '.join(s)
+
+	def _get_list_value_for_modification(self, key):
+		"""
+		Return a list value for further modification.
+
+		The list may be modified inplace and there is no need to do this afterwards::
+
+			self.table[var] = value
+		"""
+		try:
+			value = self.table[key]
+		except KeyError:
+			try: value = self.parent[key]
+			except AttributeError: value = []
+			if isinstance(value, list):
+				value = value[:]
+			else:
+				value = [value]
+		else:
+			if not isinstance(value, list):
+				value = [value]
+		self.table[key] = value
+		return value
+
+	def append_value(self, var, val):
+		"""
+		Appends a value to the specified config key::
+
+			def build(bld):
+				bld.env.append_value('CFLAGS', ['-O2'])
+
+		The value must be a list or a tuple
+		"""
+		current_value = self._get_list_value_for_modification(var)
+		if isinstance(val, str): # if there were string everywhere we could optimize this
+			val = [val]
+		current_value.extend(val)
+
+	def prepend_value(self, var, val):
+		"""
+		Prepends a value to the specified item::
+
+			def configure(conf):
+				conf.env.prepend_value('CFLAGS', ['-O2'])
+
+		The value must be a list or a tuple
+		"""
+		if isinstance(val, str):
+			val = [val]
+		self.table[var] =  val + self._get_list_value_for_modification(var)
+
+	def append_unique(self, var, val):
+		"""
+		Append a value to the specified item only if it's not already present::
+
+			def build(bld):
+				bld.env.append_unique('CFLAGS', ['-O2', '-g'])
+
+		The value must be a list or a tuple
+		"""
+		if isinstance(val, str):
+			val = [val]
+		current_value = self._get_list_value_for_modification(var)
+
+		for x in val:
+			if x not in current_value:
+				current_value.append(x)
+
+	def get_merged_dict(self):
+		"""
+		Compute the merged dictionary from the fusion of self and all its parent
+
+		:rtype: a ConfigSet object
+		"""
+		table_list = []
+		env = self
+		while 1:
+			table_list.insert(0, env.table)
+			try: env = env.parent
+			except AttributeError: break
+		merged_table = {}
+		for table in table_list:
+			merged_table.update(table)
+		return merged_table
+
+	def store(self, filename):
+		"""
+		Write the :py:class:`ConfigSet` data into a file. See :py:meth:`ConfigSet.load` for reading such files.
+
+		:param filename: file to use
+		:type filename: string
+		"""
+		try:
+			os.makedirs(os.path.split(filename)[0])
+		except OSError:
+			pass
+
+		buf = []
+		merged_table = self.get_merged_dict()
+		keys = list(merged_table.keys())
+		keys.sort()
+
+		try:
+			fun = ascii
+		except NameError:
+			fun = repr
+
+		for k in keys:
+			if k != 'undo_stack':
+				buf.append('%s = %s\n' % (k, fun(merged_table[k])))
+		Utils.writef(filename, ''.join(buf))
+
+	def load(self, filename):
+		"""
+		Retrieve the :py:class:`ConfigSet` data from a file. See :py:meth:`ConfigSet.store` for writing such files
+
+		:param filename: file to use
+		:type filename: string
+		"""
+		tbl = self.table
+		code = Utils.readf(filename, m='rU')
+		for m in re_imp.finditer(code):
+			g = m.group
+			tbl[g(2)] = eval(g(3))
+		Logs.debug('env: %s' % str(self.table))
+
+	def update(self, d):
+		"""
+		Dictionary interface: replace values from another dict
+
+		:param d: object to use the value from
+		:type d: dict-like object
+		"""
+		for k, v in d.items():
+			self[k] = v
+
+	def stash(self):
+		"""
+		Store the object state, to provide a kind of transaction support::
+
+			env = ConfigSet()
+			env.stash()
+			try:
+				env.append_value('CFLAGS', '-O3')
+				call_some_method(env)
+			finally:
+				env.revert()
+
+		The history is kept in a stack, and is lost during the serialization by :py:meth:`ConfigSet.store`
+		"""
+		orig = self.table
+		tbl = self.table = self.table.copy()
+		for x in tbl.keys():
+			tbl[x] = copy.deepcopy(tbl[x])
+		self.undo_stack = self.undo_stack + [orig]
+
+	def revert(self):
+		"""
+		Reverts the object to a previous state. See :py:meth:`ConfigSet.stash`
+		"""
+		self.table = self.undo_stack.pop(-1)
+