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waf/waflib/Node.py

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#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2005-2010 (ita)
"""
Node: filesystem structure, contains lists of nodes
#. Each file/folder is represented by exactly one node.
#. Some potential class properties are stored on :py:class:`waflib.Build.BuildContext` : nodes to depend on, etc.
Unused class members can increase the `.wafpickle` file size sensibly.
#. Node objects should never be created directly, use
the methods :py:func:`Node.make_node` or :py:func:`Node.find_node`
#. The methods :py:func:`Node.find_resource`, :py:func:`Node.find_dir` :py:func:`Node.find_or_declare` should be
used when a build context is present
#. Each instance of :py:class:`waflib.Context.Context` has a unique :py:class:`Node` subclass.
(:py:class:`waflib.Node.Nod3`, see the :py:class:`waflib.Context.Context` initializer). A reference to the context owning a node is held as self.ctx
"""
import os, re, sys, shutil
from waflib import Utils, Errors
exclude_regs = '''
**/*~
**/#*#
**/.#*
**/%*%
**/._*
**/CVS
**/CVS/**
**/.cvsignore
**/SCCS
**/SCCS/**
**/vssver.scc
**/.svn
**/.svn/**
**/BitKeeper
**/.git
**/.git/**
**/.gitignore
**/.bzr
**/.bzrignore
**/.bzr/**
**/.hg
**/.hg/**
**/_MTN
**/_MTN/**
**/.arch-ids
**/{arch}
**/_darcs
**/_darcs/**
**/.DS_Store'''
"""
Ant patterns for files and folders to exclude while doing the
recursive traversal in :py:meth:`waflib.Node.Node.ant_glob`
"""
# TODO optimize split_path by performing a replacement when unpacking?
def split_path(path):
"""
Split a path by os.sep (This is not os.path.split)
:param path: path to split
:type path: string
:rtype: list of string
:return: the path, split
"""
return path.split('/')
def split_path_cygwin(path):
if path.startswith('//'):
ret = path.split('/')[2:]
ret[0] = '/' + ret[0]
return ret
return path.split('/')
re_sp = re.compile('[/\\\\]')
def split_path_win32(path):
if path.startswith('\\\\'):
ret = re.split(re_sp, path)[2:]
ret[0] = '\\' + ret[0]
return ret
return re.split(re_sp, path)
if sys.platform == 'cygwin':
split_path = split_path_cygwin
elif Utils.is_win32:
split_path = split_path_win32
class Node(object):
"""
This class is organized in two parts
* The basic methods meant for filesystem access (compute paths, create folders, etc)
* The methods bound to a :py:class:`waflib.Build.BuildContext` (require ``bld.srcnode`` and ``bld.bldnode``)
"""
__slots__ = ('name', 'sig', 'children', 'parent', 'cache_abspath', 'cache_isdir')
def __init__(self, name, parent):
self.name = name
self.parent = parent
if parent:
if name in parent.children:
raise Errors.WafError('node %s exists in the parent files %r already' % (name, parent))
parent.children[name] = self
def __setstate__(self, data):
"Deserializes from data"
self.name = data[0]
self.parent = data[1]
if data[2] is not None:
self.children = data[2]
if data[3] is not None:
self.sig = data[3]
def __getstate__(self):
"Serialize the node info"
return (self.name, self.parent, getattr(self, 'children', None), getattr(self, 'sig', None))
def __str__(self):
"String representation (name), for debugging purposes"
return self.name
def __repr__(self):
"String representation (abspath), for debugging purposes"
return self.abspath()
def __hash__(self):
"Node hash, used for storage in dicts. This hash is not persistent."
return id(self)
def __eq__(self, node):
"Node comparison, based on the IDs"
return id(self) == id(node)
def __copy__(self):
"Implemented to prevent nodes from being copied (raises an exception)"
raise Errors.WafError('nodes are not supposed to be copied')
def read(self, flags='r'):
"""
Return the contents of the file represented by this node::
def build(bld):
bld.path.find_node('wscript').read()
:type fname: string
:param fname: Path to file
:type m: string
:param m: Open mode
:rtype: string
:return: File contents
"""
return Utils.readf(self.abspath(), flags)
def write(self, data, flags='w'):
"""
Write some text to the physical file represented by this node::
def build(bld):
bld.path.make_node('foo.txt').write('Hello, world!')
:type data: string
:param data: data to write
:type flags: string
:param flags: Write mode
"""
f = None
try:
f = open(self.abspath(), flags)
f.write(data)
finally:
if f:
f.close()
def chmod(self, val):
"""
Change file/dir permissions::
def build(bld):
bld.path.chmod(493) # 0755
"""
os.chmod(self.abspath(), val)
def delete(self):
"""Delete the file/folder physically (but not the node)"""
try:
if getattr(self, 'children', None):
shutil.rmtree(self.abspath())
else:
os.unlink(self.abspath())
except:
pass
try:
delattr(self, 'children')
except:
pass
def suffix(self):
"""Return the file extension"""
k = max(0, self.name.rfind('.'))
return self.name[k:]
def height(self):
"""Depth in the folder hierarchy from the filesystem root or from all the file drives"""
d = self
val = -1
while d:
d = d.parent
val += 1
return val
def listdir(self):
"""List the folder contents"""
lst = Utils.listdir(self.abspath())
lst.sort()
return lst
def mkdir(self):
"""
Create a folder represented by this node, creating intermediate nodes as needed
An exception will be raised only when the folder cannot possibly exist there
"""
if getattr(self, 'cache_isdir', None):
return
try:
self.parent.mkdir()
except:
pass
if self.name:
try:
os.makedirs(self.abspath())
except OSError:
pass
if not os.path.isdir(self.abspath()):
raise Errors.WafError('Could not create the directory %s' % self.abspath())
try:
self.children
except:
self.children = {}
self.cache_isdir = True
def find_node(self, lst):
"""
Find a node on the file system (files or folders), create intermediate nodes as needed
:param lst: path
:type lst: string or list of string
"""
if isinstance(lst, str):
lst = [x for x in split_path(lst) if x and x != '.']
cur = self
for x in lst:
if x == '..':
cur = cur.parent or cur
continue
try:
if x in cur.children:
cur = cur.children[x]
continue
except:
cur.children = {}
# optimistic: create the node first then look if it was correct to do so
cur = self.__class__(x, cur)
try:
os.stat(cur.abspath())
except:
del cur.parent.children[x]
return None
ret = cur
try:
os.stat(ret.abspath())
except:
del ret.parent.children[ret.name]
return None
try:
while not getattr(cur.parent, 'cache_isdir', None):
cur = cur.parent
cur.cache_isdir = True
except AttributeError:
pass
return ret
def make_node(self, lst):
"""
Find or create a node without looking on the filesystem
:param lst: path
:type lst: string or list of string
"""
if isinstance(lst, str):
lst = [x for x in split_path(lst) if x and x != '.']
cur = self
for x in lst:
if x == '..':
cur = cur.parent or cur
continue
if getattr(cur, 'children', {}):
if x in cur.children:
cur = cur.children[x]
continue
else:
cur.children = {}
cur = self.__class__(x, cur)
return cur
def search(self, lst):
"""
Search for a node without looking on the filesystem
:param lst: path
:type lst: string or list of string
"""
if isinstance(lst, str):
lst = [x for x in split_path(lst) if x and x != '.']
cur = self
try:
for x in lst:
if x == '..':
cur = cur.parent or cur
else:
cur = cur.children[x]
return cur
except:
pass
def path_from(self, node):
"""
Path of this node seen from the other::
def build(bld):
n1 = bld.path.find_node('foo/bar/xyz.txt')
n2 = bld.path.find_node('foo/stuff/')
n1.path_from(n2) # './bar/xyz.txt'
:param node: path to use as a reference
:type node: :py:class:`waflib.Node.Node`
"""
c1 = self
c2 = node
c1h = c1.height()
c2h = c2.height()
lst = []
up = 0
while c1h > c2h:
lst.append(c1.name)
c1 = c1.parent
c1h -= 1
while c2h > c1h:
up += 1
c2 = c2.parent
c2h -= 1
while id(c1) != id(c2):
lst.append(c1.name)
up += 1
c1 = c1.parent
c2 = c2.parent
for i in range(up):
lst.append('..')
lst.reverse()
return os.sep.join(lst) or '.'
def abspath(self):
"""
Absolute path. A cache is kept in the context as ``cache_node_abspath``
"""
try:
return self.cache_abspath
except:
pass
# think twice before touching this (performance + complexity + correctness)
if os.sep == '/':
if not self.parent:
val = os.sep
elif not self.parent.name:
val = os.sep + self.name
else:
val = self.parent.abspath() + os.sep + self.name
else:
if not self.parent:
val = ''
elif not self.parent.name:
val = self.name + os.sep
else:
val = self.parent.abspath().rstrip(os.sep) + os.sep + self.name
self.cache_abspath = val
return val
def is_child_of(self, node):
"""
Does this node belong to the subtree node?::
def build(bld):
node = bld.path.find_node('wscript')
node.is_child_of(bld.path) # True
:param node: path to use as a reference
:type node: :py:class:`waflib.Node.Node`
"""
p = self
diff = self.height() - node.height()
while diff > 0:
diff -= 1
p = p.parent
return id(p) == id(node)
def ant_iter(self, accept=None, maxdepth=25, pats=[], dir=False, src=True, remove=True):
"""
Semi-private and recursive method used by ant_glob.
:param accept: function used for accepting/rejecting a node, returns the patterns that can be still accepted in recursion
:type accept: function
:param maxdepth: maximum depth in the filesystem (25)
:type maxdepth: int
:param pats: list of patterns to accept and list of patterns to exclude
:type pats: tuple
:param dir: return folders too (False by default)
:type dir: bool
:param src: return files (True by default)
:type src: bool
:param remove: remove files/folders that do not exist (True by default)
:type remove: bool
"""
dircont = self.listdir()
dircont.sort()
try:
lst = set(self.children.keys())
if remove:
for x in lst - set(dircont):
del self.children[x]
except:
self.children = {}
for name in dircont:
npats = accept(name, pats)
if npats and npats[0]:
accepted = [] in npats[0]
node = self.make_node([name])
isdir = os.path.isdir(node.abspath())
if accepted:
if isdir:
if dir:
yield node
else:
if src:
yield node
if getattr(node, 'cache_isdir', None) or isdir:
node.cache_isdir = True
if maxdepth:
for k in node.ant_iter(accept=accept, maxdepth=maxdepth - 1, pats=npats, dir=dir, src=src):
yield k
raise StopIteration
def ant_glob(self, *k, **kw):
"""
This method is used for finding files across folders. It behaves like ant patterns:
* ``**/*`` find all files recursively
* ``**/*.class`` find all files ending by .class
* ``..`` find files having two dot characters
For example::
def configure(cfg):
cfg.path.ant_glob('**/*.cpp') # find all .cpp files
cfg.root.ant_glob('etc/*.txt') # using the filesystem root can be slow
cfg.path.ant_glob('*.cpp', excl=['*.c'], src=True, dir=False)
For more information see http://ant.apache.org/manual/dirtasks.html
The nodes that correspond to files and folders that do not exist will be removed
:param incl: ant patterns or list of patterns to include
:type incl: string or list of strings
:param excl: ant patterns or list of patterns to exclude
:type excl: string or list of strings
:param dir: return folders too (False by default)
:type dir: bool
:param src: return files (True by default)
:type src: bool
:param remove: remove files/folders that do not exist (True by default)
:type remove: bool
:param maxdepth: maximum depth of recursion
:type maxdepth: int
"""
src = kw.get('src', True)
dir = kw.get('dir', False)
excl = kw.get('excl', exclude_regs)
incl = k and k[0] or kw.get('incl', '**')
def to_pat(s):
lst = Utils.to_list(s)
ret = []
for x in lst:
x = x.replace('\\', '/').replace('//', '/')
if x.endswith('/'):
x += '**'
lst2 = x.split('/')
accu = []
for k in lst2:
if k == '**':
accu.append(k)
else:
k = k.replace('.', '[.]').replace('*','.*').replace('?', '.').replace('+', '\\+')
k = '^%s$' % k
try:
#print "pattern", k
accu.append(re.compile(k))
except Exception as e:
raise Errors.WafError("Invalid pattern: %s" % k, e)
ret.append(accu)
return ret
def filtre(name, nn):
ret = []
for lst in nn:
if not lst:
pass
elif lst[0] == '**':
ret.append(lst)
if len(lst) > 1:
if lst[1].match(name):
ret.append(lst[2:])
else:
ret.append([])
elif lst[0].match(name):
ret.append(lst[1:])
return ret
def accept(name, pats):
nacc = filtre(name, pats[0])
nrej = filtre(name, pats[1])
if [] in nrej:
nacc = []
return [nacc, nrej]
ret = [x for x in self.ant_iter(accept=accept, pats=[to_pat(incl), to_pat(excl)], maxdepth=25, dir=dir, src=src, remove=kw.get('remove', True))]
if kw.get('flat', False):
return ' '.join([x.path_from(self) for x in ret])
return ret
def find_nodes(self, find_dirs=True, find_files=True, match_fun=lambda x: True):
# FIXME not part of the stable API: find_node vs find_nodes? consistency with argument names on other functions?
x = """
Recursively finds nodes::
def configure(cnf):
cnf.find_nodes()
:param find_dirs: whether to return directories
:param find_files: whether to return files
:param match_fun: matching function, taking a node as parameter
:rtype generator
:return: a generator that iterates over all the requested files
"""
files = self.listdir()
for f in files:
node = self.make_node([f])
if os.path.isdir(node.abspath()):
if find_dirs and match_fun(node):
yield node
gen = node.find_nodes(find_dirs, find_files, match_fun)
for g in gen:
yield g
else:
if find_files and match_fun(node):
yield node
# --------------------------------------------------------------------------------
# the following methods require the source/build folders (bld.srcnode/bld.bldnode)
# using a subclass is a possibility, but is that really necessary?
# --------------------------------------------------------------------------------
def is_src(self):
"""
True if the node is below the source directory
note: !is_src does not imply is_bld()
:rtype: bool
"""
cur = self
x = id(self.ctx.srcnode)
y = id(self.ctx.bldnode)
while cur.parent:
if id(cur) == y:
return False
if id(cur) == x:
return True
cur = cur.parent
return False
def is_bld(self):
"""
True if the node is below the build directory
note: !is_bld does not imply is_src
:rtype: bool
"""
cur = self
y = id(self.ctx.bldnode)
while cur.parent:
if id(cur) == y:
return True
cur = cur.parent
return False
def get_src(self):
"""
Return the equivalent src node (or self if not possible)
:rtype: :py:class:`waflib.Node.Node`
"""
cur = self
x = id(self.ctx.srcnode)
y = id(self.ctx.bldnode)
lst = []
while cur.parent:
if id(cur) == y:
lst.reverse()
return self.ctx.srcnode.make_node(lst)
if id(cur) == x:
return self
lst.append(cur.name)
cur = cur.parent
return self
def get_bld(self):
"""
Return the equivalent bld node (or self if not possible)
:rtype: :py:class:`waflib.Node.Node`
"""
cur = self
x = id(self.ctx.srcnode)
y = id(self.ctx.bldnode)
lst = []
while cur.parent:
if id(cur) == y:
return self
if id(cur) == x:
lst.reverse()
return self.ctx.bldnode.make_node(lst)
lst.append(cur.name)
cur = cur.parent
# the file is external to the current project, make a fake root in the current build directory
lst.reverse()
return self.ctx.bldnode.make_node(['__root__'] + lst)
def find_resource(self, lst):
"""
Try to find a declared build node or a source file
:param lst: path
:type lst: string or list of string
"""
if isinstance(lst, str):
lst = [x for x in split_path(lst) if x and x != '.']
node = self.get_bld().search(lst)
if not node:
self = self.get_src()
node = self.find_node(lst)
try:
pat = node.abspath()
if os.path.isdir(pat):
return None
except:
pass
return node
def find_or_declare(self, lst):
"""
if 'self' is in build directory, try to return an existing node
if no node is found, go to the source directory
try to find an existing node in the source directory
if no node is found, create it in the build directory
:param lst: path
:type lst: string or list of string
"""
if isinstance(lst, str):
lst = [x for x in split_path(lst) if x and x != '.']
node = self.get_bld().search(lst)
if node:
if not os.path.isfile(node.abspath()):
node.sig = None
try:
node.parent.mkdir()
except:
pass
return node
self = self.get_src()
node = self.find_node(lst)
if node:
if not os.path.isfile(node.abspath()):
node.sig = None
try:
node.parent.mkdir()
except:
pass
return node
node = self.get_bld().make_node(lst)
node.parent.mkdir()
return node
def find_dir(self, lst):
"""
Search for a folder in the filesystem
:param lst: path
:type lst: string or list of string
"""
if isinstance(lst, str):
lst = [x for x in split_path(lst) if x and x != '.']
node = self.find_node(lst)
try:
if not os.path.isdir(node.abspath()):
return None
except (OSError, AttributeError):
# the node might be None, and raise an AttributeError
return None
return node
# helpers for building things
def change_ext(self, ext, ext_in=None):
"""
:return: A build node of the same path, but with a different extension
:rtype: :py:class:`waflib.Node.Node`
"""
name = self.name
if ext_in is None:
k = name.rfind('.')
if k >= 0:
name = name[:k] + ext
else:
name = name + ext
else:
name = name[:- len(ext_in)] + ext
return self.parent.find_or_declare([name])
def nice_path(self, env=None):
"""
Return the path seen from the launch directory. It is often used for printing nodes in the console to open
files easily.
:param env: unused, left for compatibility with waf 1.5
"""
return self.path_from(self.ctx.launch_node())
def bldpath(self):
"Path seen from the build directory default/src/foo.cpp"
return self.path_from(self.ctx.bldnode)
def srcpath(self):
"Path seen from the source directory ../src/foo.cpp"
return self.path_from(self.ctx.srcnode)
def relpath(self):
"If a file in the build directory, bldpath, else srcpath"
cur = self
x = id(self.ctx.bldnode)
while cur.parent:
if id(cur) == x:
return self.bldpath()
cur = cur.parent
return self.srcpath()
def bld_dir(self):
"Build path without the file name"
return self.parent.bldpath()
def bld_base(self):
"Build path without the extension: src/dir/foo(.cpp)"
s = os.path.splitext(self.name)[0]
return self.bld_dir() + os.sep + s
def get_bld_sig(self):
"""
Node signature, assuming the file is in the build directory
"""
try:
ret = self.ctx.hash_cache[id(self)]
except KeyError:
pass
except AttributeError:
self.ctx.hash_cache = {}
else:
return ret
if not self.is_bld() or self.ctx.bldnode is self.ctx.srcnode:
self.sig = Utils.h_file(self.abspath())
self.ctx.hash_cache[id(self)] = ret = self.sig
return ret
pickle_lock = Utils.threading.Lock()
"""Lock mandatory for thread-safe node serialization"""
class Nod3(Node):
"""Mandatory subclass for thread-safe node serialization"""
pass # do not remove
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