mirror of https://gitlab.com/ita1024/waf.git
362 lines
8.1 KiB
Python
362 lines
8.1 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2005-2018 (ita)
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"""
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ConfigSet: a special dict
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The values put in :py:class:`ConfigSet` must be serializable (dicts, lists, strings)
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"""
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import copy, re, os
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from waflib import Logs, Utils
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re_imp = re.compile(r'^(#)*?([^#=]*?)\ =\ (.*?)$', re.M)
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class ConfigSet(object):
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"""
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A copy-on-write dict with human-readable serialized format. The serialization format
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is human-readable (python-like) and performed by using eval() and repr().
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For high performance prefer pickle. Do not store functions as they are not serializable.
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The values can be accessed by attributes or by keys::
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from waflib.ConfigSet import ConfigSet
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env = ConfigSet()
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env.FOO = 'test'
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env['FOO'] = 'test'
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"""
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__slots__ = ('table', 'parent')
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def __init__(self, filename=None):
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self.table = {}
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"""
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Internal dict holding the object values
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"""
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#self.parent = None
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if filename:
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self.load(filename)
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def __contains__(self, key):
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"""
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Enables the *in* syntax::
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if 'foo' in env:
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print(env['foo'])
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"""
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if key in self.table:
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return True
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try:
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return self.parent.__contains__(key)
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except AttributeError:
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return False # parent may not exist
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def keys(self):
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"""Dict interface"""
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keys = set()
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cur = self
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while cur:
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keys.update(cur.table.keys())
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cur = getattr(cur, 'parent', None)
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keys = list(keys)
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keys.sort()
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return keys
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def __iter__(self):
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return iter(self.keys())
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def __str__(self):
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"""Text representation of the ConfigSet (for debugging purposes)"""
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return "\n".join(["%r %r" % (x, self.__getitem__(x)) for x in self.keys()])
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def __getitem__(self, key):
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"""
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Dictionary interface: get value from key::
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def configure(conf):
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conf.env['foo'] = {}
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print(env['foo'])
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"""
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try:
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while 1:
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x = self.table.get(key)
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if not x is None:
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return x
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self = self.parent
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except AttributeError:
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return []
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def __setitem__(self, key, value):
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"""
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Dictionary interface: set value from key
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"""
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self.table[key] = value
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def __delitem__(self, key):
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"""
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Dictionary interface: mark the value as missing
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"""
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self[key] = []
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def __getattr__(self, name):
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"""
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Attribute access provided for convenience. The following forms are equivalent::
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def configure(conf):
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conf.env.value
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conf.env['value']
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"""
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if name in self.__slots__:
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return object.__getattribute__(self, name)
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else:
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return self[name]
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def __setattr__(self, name, value):
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"""
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Attribute access provided for convenience. The following forms are equivalent::
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def configure(conf):
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conf.env.value = x
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env['value'] = x
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"""
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if name in self.__slots__:
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object.__setattr__(self, name, value)
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else:
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self[name] = value
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def __delattr__(self, name):
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"""
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Attribute access provided for convenience. The following forms are equivalent::
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def configure(conf):
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del env.value
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del env['value']
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"""
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if name in self.__slots__:
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object.__delattr__(self, name)
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else:
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del self[name]
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def derive(self):
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"""
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Returns a new ConfigSet deriving from self. The copy returned
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will be a shallow copy::
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from waflib.ConfigSet import ConfigSet
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env = ConfigSet()
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env.append_value('CFLAGS', ['-O2'])
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child = env.derive()
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child.CFLAGS.append('test') # warning! this will modify 'env'
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child.CFLAGS = ['-O3'] # new list, ok
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child.append_value('CFLAGS', ['-O3']) # ok
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Use :py:func:`ConfigSet.detach` to detach the child from the parent.
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"""
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newenv = ConfigSet()
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newenv.parent = self
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return newenv
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def detach(self):
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"""
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Detaches this instance from its parent (if present)
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Modifying the parent :py:class:`ConfigSet` will not change the current object
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Modifying this :py:class:`ConfigSet` will not modify the parent one.
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"""
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tbl = self.get_merged_dict()
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try:
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delattr(self, 'parent')
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except AttributeError:
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pass
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else:
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keys = tbl.keys()
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for x in keys:
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tbl[x] = copy.deepcopy(tbl[x])
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self.table = tbl
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return self
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def get_flat(self, key):
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"""
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Returns a value as a string. If the input is a list, the value returned is space-separated.
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:param key: key to use
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:type key: string
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"""
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s = self[key]
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if isinstance(s, str):
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return s
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return ' '.join(s)
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def _get_list_value_for_modification(self, key):
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"""
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Returns a list value for further modification.
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The list may be modified inplace and there is no need to do this afterwards::
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self.table[var] = value
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"""
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try:
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value = self.table[key]
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except KeyError:
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try:
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value = self.parent[key]
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except AttributeError:
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value = []
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else:
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if isinstance(value, list):
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# force a copy
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value = value[:]
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else:
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value = [value]
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self.table[key] = value
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else:
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if not isinstance(value, list):
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self.table[key] = value = [value]
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return value
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def append_value(self, var, val):
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"""
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Appends a value to the specified config key::
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def build(bld):
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bld.env.append_value('CFLAGS', ['-O2'])
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The value must be a list or a tuple
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"""
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if isinstance(val, str): # if there were string everywhere we could optimize this
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val = [val]
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current_value = self._get_list_value_for_modification(var)
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current_value.extend(val)
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def prepend_value(self, var, val):
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"""
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Prepends a value to the specified item::
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def configure(conf):
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conf.env.prepend_value('CFLAGS', ['-O2'])
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The value must be a list or a tuple
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"""
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if isinstance(val, str):
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val = [val]
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self.table[var] = val + self._get_list_value_for_modification(var)
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def append_unique(self, var, val):
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"""
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Appends a value to the specified item only if it's not already present::
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def build(bld):
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bld.env.append_unique('CFLAGS', ['-O2', '-g'])
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The value must be a list or a tuple
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"""
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if isinstance(val, str):
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val = [val]
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current_value = self._get_list_value_for_modification(var)
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for x in val:
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if x not in current_value:
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current_value.append(x)
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def get_merged_dict(self):
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"""
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Computes the merged dictionary from the fusion of self and all its parent
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:rtype: a ConfigSet object
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"""
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table_list = []
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env = self
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while 1:
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table_list.insert(0, env.table)
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try:
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env = env.parent
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except AttributeError:
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break
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merged_table = {}
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for table in table_list:
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merged_table.update(table)
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return merged_table
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def store(self, filename):
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"""
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Serializes the :py:class:`ConfigSet` data to a file. See :py:meth:`ConfigSet.load` for reading such files.
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:param filename: file to use
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:type filename: string
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"""
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try:
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os.makedirs(os.path.split(filename)[0])
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except OSError:
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pass
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buf = []
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merged_table = self.get_merged_dict()
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keys = list(merged_table.keys())
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keys.sort()
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try:
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fun = ascii
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except NameError:
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fun = repr
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for k in keys:
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if k != 'undo_stack':
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buf.append('%s = %s\n' % (k, fun(merged_table[k])))
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Utils.writef(filename, ''.join(buf))
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def load(self, filename):
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"""
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Restores contents from a file (current values are not cleared). Files are written using :py:meth:`ConfigSet.store`.
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:param filename: file to use
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:type filename: string
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"""
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tbl = self.table
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code = Utils.readf(filename, m='r')
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for m in re_imp.finditer(code):
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g = m.group
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tbl[g(2)] = eval(g(3))
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Logs.debug('env: %s', self.table)
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def update(self, d):
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"""
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Dictionary interface: replace values with the ones from another dict
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:param d: object to use the value from
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:type d: dict-like object
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"""
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self.table.update(d)
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def stash(self):
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"""
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Stores the object state to provide transactionality semantics::
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env = ConfigSet()
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env.stash()
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try:
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env.append_value('CFLAGS', '-O3')
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call_some_method(env)
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finally:
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env.revert()
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The history is kept in a stack, and is lost during the serialization by :py:meth:`ConfigSet.store`
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"""
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orig = self.table
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tbl = self.table = self.table.copy()
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for x in tbl.keys():
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tbl[x] = copy.deepcopy(tbl[x])
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self.undo_stack = self.undo_stack + [orig]
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def commit(self):
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"""
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Commits transactional changes. See :py:meth:`ConfigSet.stash`
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"""
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self.undo_stack.pop(-1)
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def revert(self):
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"""
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Reverts the object to a previous state. See :py:meth:`ConfigSet.stash`
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"""
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self.table = self.undo_stack.pop(-1)
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