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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/**
**/.intlcache
**/.DS_Store'''
"""
Ant patterns for files and folders to exclude while doing the
recursive traversal in :py:meth:`waflib.Node.Node.ant_glob`
"""
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``)
The Node objects are not thread safe in any way.
"""
dict_class = dict
__slots__ = ('name', 'parent', 'children', '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:
# Issue 1480
self.children = self.dict_class(data[2])
def __getstate__(self):
"Serialize the node info"
return (self.name, self.parent, getattr(self, 'children', 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 __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', encoding='ISO8859-1'):
"""
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, encoding)
def write(self, data, flags='w', encoding='ISO8859-1'):
"""
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
"""
Utils.writef(self.abspath(), data, flags, encoding)
def read_json(self, convert=True, encoding='utf-8'):
"""
Read and parse the contents of this node as JSON::
def build(bld):
bld.path.find_node('abc.json').read_json()
Note that this by default automatically decodes unicode strings on Python2, unlike what the Python JSON module does.
:type convert: boolean
:param convert: Prevents decoding of unicode strings on Python2
:type encoding: string
:param encoding: The encoding of the file to read. This default to UTF8 as per the JSON standard
:rtype: object
:return: Parsed file contents
"""
import json # Python 2.6 and up
object_pairs_hook = None
if convert and sys.hexversion < 0x3000000:
try:
_type = unicode
except NameError:
_type = str
def convert(value):
if isinstance(value, list):
return [convert(element) for element in value]
elif isinstance(value, _type):
return str(value)
else:
return value
def object_pairs(pairs):
return dict((str(pair[0]), convert(pair[1])) for pair in pairs)
object_pairs_hook = object_pairs
return json.loads(self.read(encoding=encoding), object_pairs_hook=object_pairs_hook)
def write_json(self, data, pretty=True):
"""
Writes a python object as JSON to disk. Files are always written as UTF8 as per the JSON standard::
def build(bld):
bld.path.find_node('xyz.json').write_json(199)
:type data: object
:param data: The data to write to disk
:type pretty: boolean
:param pretty: Determines if the JSON will be nicely space separated
"""
import json # Python 2.6 and up
indent = 2
separators = (',', ': ')
sort_keys = pretty
newline = os.linesep
if not pretty:
indent = None
separators = (',', ':')
newline = ''
output = json.dumps(data, indent=indent, separators=separators, sort_keys=sort_keys) + newline
self.write(output, encoding='utf-8')
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, and remove this node from the tree. Do not use this object after calling this method."""
try:
try:
if hasattr(self, 'children'):
shutil.rmtree(self.abspath())
else:
os.remove(self.abspath())
except OSError as e:
if os.path.exists(self.abspath()):
raise e
finally:
self.evict()
def evict(self):
"""Internal - called when a node is removed"""
del self.parent.children[self.name]
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 OSError:
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 AttributeError:
self.children = self.dict_class()
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 Utils.split_path(lst) if x and x != '.']
cur = self
for x in lst:
if x == '..':
cur = cur.parent or cur
continue
try:
ch = cur.children
except AttributeError:
cur.children = self.dict_class()
else:
try:
cur = ch[x]
continue
except KeyError:
pass
# 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 OSError:
cur.evict()
return None
ret = cur
try:
os.stat(ret.abspath())
except OSError:
ret.evict()
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 Utils.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 = self.dict_class()
cur = self.__class__(x, cur)
return cur
def search_node(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 Utils.split_path(lst) if x and x != '.']
cur = self
for x in lst:
if x == '..':
cur = cur.parent or cur
else:
try:
cur = cur.children[x]
except (AttributeError, KeyError):
return None
return cur
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
if c1.parent:
for i in range(up):
lst.append('..')
else:
if lst and not Utils.is_win32:
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 AttributeError:
pass
# think twice before touching this (performance + complexity + correctness)
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
self.cache_abspath = val
return val
if Utils.is_win32:
def abspath(self):
try:
return self.cache_abspath
except AttributeError:
pass
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())
except AttributeError:
self.children = self.dict_class()
else:
if remove:
for x in lst - set(dircont):
self.children[x].evict()
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, remove=remove):
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. To prevent this
behaviour, pass 'remove=False'
: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
:param ignorecase: ignore case while matching (False by default)
:type ignorecase: bool
"""
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', '**')
reflags = kw.get('ignorecase', 0) and re.I
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, flags=reflags))
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=kw.get('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
# --------------------------------------------------------------------------------
# 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()
if lst and Utils.is_win32 and len(lst[0]) == 2 and lst[0].endswith(':'):
lst[0] = lst[0][0]
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 Utils.split_path(lst) if x and x != '.']
node = self.get_bld().search_node(lst)
if not node:
self = self.get_src()
node = self.find_node(lst)
if node:
if os.path.isdir(node.abspath()):
return None
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 Utils.split_path(lst) if x and x != '.']
node = self.get_bld().search_node(lst)
if node:
if not os.path.isfile(node.abspath()):
node.parent.mkdir()
return node
self = self.get_src()
node = self.find_node(lst)
if node:
if not os.path.isfile(node.abspath()):
node.parent.mkdir()
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 Utils.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 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 exists(self):
return os.path.exists(self.abspath())
@Utils.run_once
def get_bld_sig(self):
"""
Node signature. If there is a build directory or and the file is there,
the signature calculation relies on an existing attribute. Else the
signature is calculated automatically.
"""
# previous behaviour can be set by returning self.ctx.node_sigs[self] when a build node
return Utils.h_file(self.abspath())
# --------------------------------------------
# TODO waf 2.0, remove the cache_sig attribute
def get_sig(self):
return self.h_file()
sig = property(get_sig, Utils.nada)
cache_sig = property(get_sig, Utils.nada)
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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