mirror of
https://gitlab.com/ita1024/waf.git
synced 2024-11-10 20:29:10 +01:00
889 lines
25 KiB
Python
889 lines
25 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2005-2016 (ita)
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"""
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Task generators
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The class :py:class:`waflib.TaskGen.task_gen` encapsulates the creation of task objects (low-level code)
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The instances can have various parameters, but the creation of task nodes (Task.py)
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is deferred. To achieve this, various methods are called from the method "apply"
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"""
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import copy, re, os, functools
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from waflib import Task, Utils, Logs, Errors, ConfigSet, Node
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feats = Utils.defaultdict(set)
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"""remember the methods declaring features"""
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HEADER_EXTS = ['.h', '.hpp', '.hxx', '.hh']
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class task_gen(object):
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"""
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Instances of this class create :py:class:`waflib.Task.TaskBase` when
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calling the method :py:meth:`waflib.TaskGen.task_gen.post` from the main thread.
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A few notes:
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* The methods to call (*self.meths*) can be specified dynamically (removing, adding, ..)
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* The 'features' are used to add methods to self.meths and then execute them
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* The attribute 'path' is a node representing the location of the task generator
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* The tasks created are added to the attribute *tasks*
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* The attribute 'idx' is a counter of task generators in the same path
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"""
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mappings = Utils.ordered_iter_dict()
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"""Mappings are global file extension mappings that are retrieved in the order of definition"""
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prec = Utils.defaultdict(list)
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"""Dict that holds the precedence execution rules for task generator methods"""
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def __init__(self, *k, **kw):
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"""
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Task generator objects predefine various attributes (source, target) for possible
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processing by process_rule (make-like rules) or process_source (extensions, misc methods)
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Tasks are stored on the attribute 'tasks'. They are created by calling methods
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listed in ``self.meths`` or referenced in the attribute ``features``
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A topological sort is performed to execute the methods in correct order.
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The extra key/value elements passed in ``kw`` are set as attributes
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"""
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self.source = ''
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self.target = ''
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self.meths = []
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"""
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List of method names to execute (internal)
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"""
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self.features = []
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"""
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List of feature names for bringing new methods in
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"""
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self.tasks = []
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"""
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Tasks created are added to this list
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"""
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if not 'bld' in kw:
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# task generators without a build context :-/
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self.env = ConfigSet.ConfigSet()
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self.idx = 0
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self.path = None
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else:
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self.bld = kw['bld']
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self.env = self.bld.env.derive()
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self.path = self.bld.path # emulate chdir when reading scripts
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# provide a unique id
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try:
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self.idx = self.bld.idx[self.path] = self.bld.idx.get(self.path, 0) + 1
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except AttributeError:
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self.bld.idx = {}
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self.idx = self.bld.idx[self.path] = 1
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for key, val in kw.items():
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setattr(self, key, val)
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def __str__(self):
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"""Debugging helper"""
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return "<task_gen %r declared in %s>" % (self.name, self.path.abspath())
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def __repr__(self):
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"""Debugging helper"""
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lst = []
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for x in self.__dict__:
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if x not in ('env', 'bld', 'compiled_tasks', 'tasks'):
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lst.append("%s=%s" % (x, repr(getattr(self, x))))
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return "bld(%s) in %s" % (", ".join(lst), self.path.abspath())
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def get_cwd(self):
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"""
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Current working directory for the task generator, defaults to the build directory.
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This is still used in a few places but it should disappear at some point as the classes
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define their own working directory.
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:rtype: :py:class:`waflib.Node.Node`
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"""
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return self.bld.bldnode
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def get_name(self):
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"""
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If the attribute ``name`` is not set on the instance,
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the name is computed from the target name::
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def build(bld):
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x = bld(name='foo')
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x.get_name() # foo
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y = bld(target='bar')
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y.get_name() # bar
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:rtype: string
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:return: name of this task generator
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"""
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try:
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return self._name
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except AttributeError:
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if isinstance(self.target, list):
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lst = [str(x) for x in self.target]
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name = self._name = ','.join(lst)
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else:
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name = self._name = str(self.target)
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return name
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def set_name(self, name):
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self._name = name
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name = property(get_name, set_name)
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def to_list(self, val):
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"""
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Ensures that a parameter is a list, see :py:func:`waflib.Utils.to_list`
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:type val: string or list of string
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:param val: input to return as a list
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:rtype: list
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"""
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if isinstance(val, str):
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return val.split()
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else:
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return val
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def post(self):
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"""
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Creates tasks for this task generators. The following operations are performed:
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#. The body of this method is called only once and sets the attribute ``posted``
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#. The attribute ``features`` is used to add more methods in ``self.meths``
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#. The methods are sorted by the precedence table ``self.prec`` or `:waflib:attr:waflib.TaskGen.task_gen.prec`
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#. The methods are then executed in order
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#. The tasks created are added to :py:attr:`waflib.TaskGen.task_gen.tasks`
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"""
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if getattr(self, 'posted', None):
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return False
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self.posted = True
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keys = set(self.meths)
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keys.update(feats['*'])
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# add the methods listed in the features
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self.features = Utils.to_list(self.features)
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for x in self.features:
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st = feats[x]
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if st:
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keys.update(st)
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elif not x in Task.classes:
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Logs.warn('feature %r does not exist - bind at least one method to it?', x)
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# copy the precedence table
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prec = {}
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prec_tbl = self.prec
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for x in prec_tbl:
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if x in keys:
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prec[x] = prec_tbl[x]
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# elements disconnected
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tmp = []
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for a in keys:
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for x in prec.values():
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if a in x: break
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else:
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tmp.append(a)
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tmp.sort()
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# topological sort
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out = []
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while tmp:
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e = tmp.pop()
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if e in keys:
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out.append(e)
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try:
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nlst = prec[e]
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except KeyError:
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pass
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else:
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del prec[e]
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for x in nlst:
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for y in prec:
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if x in prec[y]:
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break
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else:
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tmp.append(x)
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if prec:
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buf = ['Cycle detected in the method execution:']
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for k, v in prec.items():
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buf.append('- %s after %s' % (k, [x for x in v if x in prec]))
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raise Errors.WafError('\n'.join(buf))
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out.reverse()
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self.meths = out
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# then we run the methods in order
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Logs.debug('task_gen: posting %s %d', self, id(self))
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for x in out:
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try:
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v = getattr(self, x)
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except AttributeError:
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raise Errors.WafError('%r is not a valid task generator method' % x)
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Logs.debug('task_gen: -> %s (%d)', x, id(self))
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v()
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Logs.debug('task_gen: posted %s', self.name)
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return True
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def get_hook(self, node):
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"""
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Returns the ``@extension`` method to call for a Node of a particular extension.
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:param node: Input file to process
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:type node: :py:class:`waflib.Tools.Node.Node`
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:return: A method able to process the input node by looking at the extension
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:rtype: function
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"""
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name = node.name
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for k in self.mappings:
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try:
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if name.endswith(k):
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return self.mappings[k]
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except TypeError:
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# regexps objects
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if k.match(name):
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return self.mappings[k]
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keys = list(self.mappings.keys())
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raise Errors.WafError("File %r has no mapping in %r (load a waf tool?)" % (node, keys))
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def create_task(self, name, src=None, tgt=None, **kw):
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"""
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Creates task instances.
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:param name: task class name
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:type name: string
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:param src: input nodes
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:type src: list of :py:class:`waflib.Tools.Node.Node`
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:param tgt: output nodes
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:type tgt: list of :py:class:`waflib.Tools.Node.Node`
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:return: A task object
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:rtype: :py:class:`waflib.Task.TaskBase`
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"""
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task = Task.classes[name](env=self.env.derive(), generator=self)
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if src:
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task.set_inputs(src)
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if tgt:
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task.set_outputs(tgt)
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task.__dict__.update(kw)
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self.tasks.append(task)
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return task
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def clone(self, env):
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"""
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Makes a copy of a task generator. Once the copy is made, it is necessary to ensure that the
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it does not create the same output files as the original, or the same files may
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be compiled several times.
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:param env: A configuration set
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:type env: :py:class:`waflib.ConfigSet.ConfigSet`
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:return: A copy
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:rtype: :py:class:`waflib.TaskGen.task_gen`
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"""
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newobj = self.bld()
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for x in self.__dict__:
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if x in ('env', 'bld'):
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continue
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elif x in ('path', 'features'):
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setattr(newobj, x, getattr(self, x))
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else:
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setattr(newobj, x, copy.copy(getattr(self, x)))
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newobj.posted = False
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if isinstance(env, str):
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newobj.env = self.bld.all_envs[env].derive()
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else:
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newobj.env = env.derive()
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return newobj
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def declare_chain(name='', rule=None, reentrant=None, color='BLUE',
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ext_in=[], ext_out=[], before=[], after=[], decider=None, scan=None, install_path=None, shell=False):
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"""
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Creates a new mapping and a task class for processing files by extension.
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See Tools/flex.py for an example.
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:param name: name for the task class
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:type name: string
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:param rule: function to execute or string to be compiled in a function
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:type rule: string or function
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:param reentrant: re-inject the output file in the process (done automatically, set to 0 to disable)
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:type reentrant: int
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:param color: color for the task output
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:type color: string
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:param ext_in: execute the task only after the files of such extensions are created
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:type ext_in: list of string
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:param ext_out: execute the task only before files of such extensions are processed
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:type ext_out: list of string
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:param before: execute instances of this task before classes of the given names
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:type before: list of string
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:param after: execute instances of this task after classes of the given names
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:type after: list of string
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:param decider: if present, function that returns a list of output file extensions (overrides ext_out for output files, but not for the build order)
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:type decider: function
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:param scan: scanner function for the task
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:type scan: function
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:param install_path: installation path for the output nodes
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:type install_path: string
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"""
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ext_in = Utils.to_list(ext_in)
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ext_out = Utils.to_list(ext_out)
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if not name:
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name = rule
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cls = Task.task_factory(name, rule, color=color, ext_in=ext_in, ext_out=ext_out, before=before, after=after, scan=scan, shell=shell)
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def x_file(self, node):
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if ext_in:
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_ext_in = ext_in[0]
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tsk = self.create_task(name, node)
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cnt = 0
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ext = decider(self, node) if decider else cls.ext_out
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for x in ext:
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k = node.change_ext(x, ext_in=_ext_in)
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tsk.outputs.append(k)
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if reentrant != None:
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if cnt < int(reentrant):
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self.source.append(k)
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else:
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# reinject downstream files into the build
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for y in self.mappings: # ~ nfile * nextensions :-/
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if k.name.endswith(y):
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self.source.append(k)
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break
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cnt += 1
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if install_path:
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self.install_task = self.add_install_files(install_to=install_path, install_from=tsk.outputs)
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return tsk
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for x in cls.ext_in:
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task_gen.mappings[x] = x_file
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return x_file
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def taskgen_method(func):
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"""
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Decorator that registers method as a task generator method.
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The function must accept a task generator as first parameter::
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from waflib.TaskGen import taskgen_method
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@taskgen_method
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def mymethod(self):
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pass
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:param func: task generator method to add
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:type func: function
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:rtype: function
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"""
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setattr(task_gen, func.__name__, func)
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return func
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def feature(*k):
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"""
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Decorator that registers a task generator method that will be executed when the
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object attribute ``feature`` contains the corresponding key(s)::
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from waflib.Task import feature
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@feature('myfeature')
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def myfunction(self):
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print('that is my feature!')
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def build(bld):
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bld(features='myfeature')
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:param k: feature names
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:type k: list of string
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"""
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def deco(func):
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setattr(task_gen, func.__name__, func)
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for name in k:
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feats[name].update([func.__name__])
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return func
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return deco
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def before_method(*k):
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"""
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Decorator that registera task generator method which will be executed
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before the functions of given name(s)::
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from waflib.TaskGen import feature, before
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@feature('myfeature')
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@before_method('fun2')
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def fun1(self):
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print('feature 1!')
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@feature('myfeature')
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def fun2(self):
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print('feature 2!')
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def build(bld):
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bld(features='myfeature')
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:param k: method names
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:type k: list of string
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"""
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def deco(func):
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setattr(task_gen, func.__name__, func)
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for fun_name in k:
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if not func.__name__ in task_gen.prec[fun_name]:
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task_gen.prec[fun_name].append(func.__name__)
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#task_gen.prec[fun_name].sort()
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return func
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return deco
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before = before_method
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def after_method(*k):
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"""
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Decorator that registers a task generator method which will be executed
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after the functions of given name(s)::
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from waflib.TaskGen import feature, after
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@feature('myfeature')
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@after_method('fun2')
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def fun1(self):
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print('feature 1!')
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@feature('myfeature')
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def fun2(self):
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print('feature 2!')
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def build(bld):
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bld(features='myfeature')
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:param k: method names
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:type k: list of string
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"""
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def deco(func):
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setattr(task_gen, func.__name__, func)
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for fun_name in k:
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if not fun_name in task_gen.prec[func.__name__]:
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task_gen.prec[func.__name__].append(fun_name)
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#task_gen.prec[func.__name__].sort()
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return func
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return deco
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after = after_method
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def extension(*k):
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"""
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Decorator that registers a task generator method which will be invoked during
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the processing of source files for the extension given::
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from waflib import Task
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class mytask(Task):
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run_str = 'cp ${SRC} ${TGT}'
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@extension('.moo')
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def create_maa_file(self, node):
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self.create_task('mytask', node, node.change_ext('.maa'))
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def build(bld):
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bld(source='foo.moo')
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"""
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def deco(func):
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setattr(task_gen, func.__name__, func)
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for x in k:
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task_gen.mappings[x] = func
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return func
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return deco
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# ---------------------------------------------------------------
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# The following methods are task generator methods commonly used
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# they are almost examples, the rest of waf core does not depend on them
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@taskgen_method
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def to_nodes(self, lst, path=None):
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"""
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Converts the input list into a list of nodes.
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It is used by :py:func:`waflib.TaskGen.process_source` and :py:func:`waflib.TaskGen.process_rule`.
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It is designed for source files, for folders, see :py:func:`waflib.Tools.ccroot.to_incnodes`:
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:param lst: input list
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:type lst: list of string and nodes
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:param path: path from which to search the nodes (by default, :py:attr:`waflib.TaskGen.task_gen.path`)
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:type path: :py:class:`waflib.Tools.Node.Node`
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:rtype: list of :py:class:`waflib.Tools.Node.Node`
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"""
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tmp = []
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path = path or self.path
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find = path.find_resource
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if isinstance(lst, Node.Node):
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lst = [lst]
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# either a list or a string, convert to a list of nodes
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for x in Utils.to_list(lst):
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if isinstance(x, str):
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node = find(x)
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else:
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node = x
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if not node:
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raise Errors.WafError("source not found: %r in %r" % (x, self))
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tmp.append(node)
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return tmp
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@feature('*')
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def process_source(self):
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"""
|
|
Processes each element in the attribute ``source`` by extension.
|
|
|
|
#. The *source* list is converted through :py:meth:`waflib.TaskGen.to_nodes` to a list of :py:class:`waflib.Node.Node` first.
|
|
#. File extensions are mapped to methods having the signature: ``def meth(self, node)`` by :py:meth:`waflib.TaskGen.extension`
|
|
#. The method is retrieved through :py:meth:`waflib.TaskGen.task_gen.get_hook`
|
|
#. When called, the methods may modify self.source to append more source to process
|
|
#. The mappings can map an extension or a filename (see the code below)
|
|
"""
|
|
self.source = self.to_nodes(getattr(self, 'source', []))
|
|
for node in self.source:
|
|
self.get_hook(node)(self, node)
|
|
|
|
@feature('*')
|
|
@before_method('process_source')
|
|
def process_rule(self):
|
|
"""
|
|
Processes the attribute ``rule``. When present, :py:meth:`waflib.TaskGen.process_source` is disabled::
|
|
|
|
def build(bld):
|
|
bld(rule='cp ${SRC} ${TGT}', source='wscript', target='bar.txt')
|
|
"""
|
|
if not getattr(self, 'rule', None):
|
|
return
|
|
|
|
# create the task class
|
|
name = str(getattr(self, 'name', None) or self.target or getattr(self.rule, '__name__', self.rule))
|
|
|
|
# or we can put the class in a cache for performance reasons
|
|
try:
|
|
cache = self.bld.cache_rule_attr
|
|
except AttributeError:
|
|
cache = self.bld.cache_rule_attr = {}
|
|
|
|
chmod = getattr(self, 'chmod', None)
|
|
shell = getattr(self, 'shell', True)
|
|
color = getattr(self, 'color', 'BLUE')
|
|
scan = getattr(self, 'scan', None)
|
|
_vars = getattr(self, 'vars', [])
|
|
cls_str = getattr(self, 'cls_str', None)
|
|
cls_keyword = getattr(self, 'cls_keyword', None)
|
|
use_cache = getattr(self, 'cache_rule', 'True')
|
|
|
|
scan_val = has_deps = hasattr(self, 'deps')
|
|
if scan:
|
|
scan_val = id(scan)
|
|
|
|
key = Utils.h_list((name, self.rule, chmod, shell, color, cls_str, cls_keyword, scan_val, _vars))
|
|
|
|
cls = None
|
|
if use_cache:
|
|
try:
|
|
cls = cache[key]
|
|
except KeyError:
|
|
pass
|
|
if not cls:
|
|
rule = self.rule
|
|
if chmod is not None:
|
|
def chmod_fun(tsk):
|
|
for x in tsk.outputs:
|
|
os.chmod(x.abspath(), tsk.generator.chmod)
|
|
if isinstance(rule, tuple):
|
|
rule = list(rule)
|
|
rule.append(chmod_fun)
|
|
rule = tuple(rule)
|
|
else:
|
|
rule = (rule, chmod_fun)
|
|
|
|
cls = Task.task_factory(name, rule, _vars, shell=shell, color=color)
|
|
|
|
if cls_str:
|
|
setattr(cls, '__str__', self.cls_str)
|
|
|
|
if cls_keyword:
|
|
setattr(cls, 'keyword', self.cls_keyword)
|
|
|
|
if scan:
|
|
cls.scan = self.scan
|
|
elif has_deps:
|
|
def scan(self):
|
|
nodes = []
|
|
for x in self.generator.to_list(getattr(self.generator, 'deps', None)):
|
|
node = self.generator.path.find_resource(x)
|
|
if not node:
|
|
self.generator.bld.fatal('Could not find %r (was it declared?)' % x)
|
|
nodes.append(node)
|
|
return [nodes, []]
|
|
cls.scan = scan
|
|
|
|
# TODO use these values in the cache key if provided
|
|
# (may cause excessive caching)
|
|
for x in ('after', 'before', 'ext_in', 'ext_out'):
|
|
setattr(cls, x, getattr(self, x, []))
|
|
|
|
if use_cache:
|
|
cache[key] = cls
|
|
|
|
# now create one instance
|
|
tsk = self.create_task(name)
|
|
|
|
if getattr(self, 'timeout', None):
|
|
tsk.timeout = self.timeout
|
|
|
|
if getattr(self, 'always', None):
|
|
tsk.always_run = True
|
|
|
|
if getattr(self, 'target', None):
|
|
if isinstance(self.target, str):
|
|
self.target = self.target.split()
|
|
if not isinstance(self.target, list):
|
|
self.target = [self.target]
|
|
for x in self.target:
|
|
if isinstance(x, str):
|
|
tsk.outputs.append(self.path.find_or_declare(x))
|
|
else:
|
|
x.parent.mkdir() # if a node was given, create the required folders
|
|
tsk.outputs.append(x)
|
|
if getattr(self, 'install_path', None):
|
|
self.install_task = self.add_install_files(install_to=self.install_path,
|
|
install_from=tsk.outputs, chmod=getattr(self, 'chmod', Utils.O644))
|
|
|
|
if getattr(self, 'source', None):
|
|
tsk.inputs = self.to_nodes(self.source)
|
|
# bypass the execution of process_source by setting the source to an empty list
|
|
self.source = []
|
|
|
|
if getattr(self, 'cwd', None):
|
|
tsk.cwd = self.cwd
|
|
|
|
if isinstance(tsk.run, functools.partial):
|
|
# Python documentation says: "partial objects defined in classes
|
|
# behave like static methods and do not transform into bound
|
|
# methods during instance attribute look-up."
|
|
tsk.run = functools.partial(tsk.run, tsk)
|
|
|
|
|
|
@feature('seq')
|
|
def sequence_order(self):
|
|
"""
|
|
Adds a strict sequential constraint between the tasks generated by task generators.
|
|
It works because task generators are posted in order.
|
|
It will not post objects which belong to other folders.
|
|
|
|
Example::
|
|
|
|
bld(features='javac seq')
|
|
bld(features='jar seq')
|
|
|
|
To start a new sequence, set the attribute seq_start, for example::
|
|
|
|
obj = bld(features='seq')
|
|
obj.seq_start = True
|
|
|
|
Note that the method is executed in last position. This is more an
|
|
example than a widely-used solution.
|
|
"""
|
|
if self.meths and self.meths[-1] != 'sequence_order':
|
|
self.meths.append('sequence_order')
|
|
return
|
|
|
|
if getattr(self, 'seq_start', None):
|
|
return
|
|
|
|
# all the tasks previously declared must be run before these
|
|
if getattr(self.bld, 'prev', None):
|
|
self.bld.prev.post()
|
|
for x in self.bld.prev.tasks:
|
|
for y in self.tasks:
|
|
y.set_run_after(x)
|
|
|
|
self.bld.prev = self
|
|
|
|
|
|
re_m4 = re.compile('@(\w+)@', re.M)
|
|
|
|
class subst_pc(Task.Task):
|
|
"""
|
|
Creates *.pc* files from *.pc.in*. The task is executed whenever an input variable used
|
|
in the substitution changes.
|
|
"""
|
|
|
|
def force_permissions(self):
|
|
"Private for the time being, we will probably refactor this into run_str=[run1,chmod]"
|
|
if getattr(self.generator, 'chmod', None):
|
|
for x in self.outputs:
|
|
os.chmod(x.abspath(), self.generator.chmod)
|
|
|
|
def run(self):
|
|
"Substitutes variables in a .in file"
|
|
|
|
if getattr(self.generator, 'is_copy', None):
|
|
for i, x in enumerate(self.outputs):
|
|
x.write(self.inputs[i].read('rb'), 'wb')
|
|
self.force_permissions()
|
|
return None
|
|
|
|
if getattr(self.generator, 'fun', None):
|
|
ret = self.generator.fun(self)
|
|
if not ret:
|
|
self.force_permissions()
|
|
return ret
|
|
|
|
code = self.inputs[0].read(encoding=getattr(self.generator, 'encoding', 'ISO8859-1'))
|
|
if getattr(self.generator, 'subst_fun', None):
|
|
code = self.generator.subst_fun(self, code)
|
|
if code is not None:
|
|
self.outputs[0].write(code, encoding=getattr(self.generator, 'encoding', 'ISO8859-1'))
|
|
self.force_permissions()
|
|
return None
|
|
|
|
# replace all % by %% to prevent errors by % signs
|
|
code = code.replace('%', '%%')
|
|
|
|
# extract the vars foo into lst and replace @foo@ by %(foo)s
|
|
lst = []
|
|
def repl(match):
|
|
g = match.group
|
|
if g(1):
|
|
lst.append(g(1))
|
|
return "%%(%s)s" % g(1)
|
|
return ''
|
|
global re_m4
|
|
code = getattr(self.generator, 're_m4', re_m4).sub(repl, code)
|
|
|
|
try:
|
|
d = self.generator.dct
|
|
except AttributeError:
|
|
d = {}
|
|
for x in lst:
|
|
tmp = getattr(self.generator, x, '') or self.env[x] or self.env[x.upper()]
|
|
try:
|
|
tmp = ''.join(tmp)
|
|
except TypeError:
|
|
tmp = str(tmp)
|
|
d[x] = tmp
|
|
|
|
code = code % d
|
|
self.outputs[0].write(code, encoding=getattr(self.generator, 'encoding', 'ISO8859-1'))
|
|
self.generator.bld.raw_deps[self.uid()] = lst
|
|
|
|
# make sure the signature is updated
|
|
try: delattr(self, 'cache_sig')
|
|
except AttributeError: pass
|
|
|
|
self.force_permissions()
|
|
|
|
def sig_vars(self):
|
|
"""
|
|
Compute a hash (signature) of the variables used in the substitution
|
|
"""
|
|
bld = self.generator.bld
|
|
env = self.env
|
|
upd = self.m.update
|
|
|
|
if getattr(self.generator, 'fun', None):
|
|
upd(Utils.h_fun(self.generator.fun).encode())
|
|
if getattr(self.generator, 'subst_fun', None):
|
|
upd(Utils.h_fun(self.generator.subst_fun).encode())
|
|
|
|
# raw_deps: persistent custom values returned by the scanner
|
|
vars = self.generator.bld.raw_deps.get(self.uid(), [])
|
|
|
|
# hash both env vars and task generator attributes
|
|
act_sig = bld.hash_env_vars(env, vars)
|
|
upd(act_sig)
|
|
|
|
lst = [getattr(self.generator, x, '') for x in vars]
|
|
upd(Utils.h_list(lst))
|
|
|
|
return self.m.digest()
|
|
|
|
@extension('.pc.in')
|
|
def add_pcfile(self, node):
|
|
"""
|
|
Processes *.pc.in* files to *.pc*. Installs the results to ``${PREFIX}/lib/pkgconfig/`` by default
|
|
|
|
def build(bld):
|
|
bld(source='foo.pc.in', install_path='${LIBDIR}/pkgconfig/')
|
|
"""
|
|
tsk = self.create_task('subst_pc', node, node.change_ext('.pc', '.pc.in'))
|
|
self.install_task = self.add_install_files(
|
|
install_to=getattr(self, 'install_path', '${LIBDIR}/pkgconfig/'), install_from=tsk.outputs)
|
|
|
|
class subst(subst_pc):
|
|
pass
|
|
|
|
@feature('subst')
|
|
@before_method('process_source', 'process_rule')
|
|
def process_subst(self):
|
|
"""
|
|
Defines a transformation that substitutes the contents of *source* files to *target* files::
|
|
|
|
def build(bld):
|
|
bld(
|
|
features='subst',
|
|
source='foo.c.in',
|
|
target='foo.c',
|
|
install_path='${LIBDIR}/pkgconfig',
|
|
VAR = 'val'
|
|
)
|
|
|
|
The input files are supposed to contain macros of the form *@VAR@*, where *VAR* is an argument
|
|
of the task generator object.
|
|
|
|
This method overrides the processing by :py:meth:`waflib.TaskGen.process_source`.
|
|
"""
|
|
|
|
src = Utils.to_list(getattr(self, 'source', []))
|
|
if isinstance(src, Node.Node):
|
|
src = [src]
|
|
tgt = Utils.to_list(getattr(self, 'target', []))
|
|
if isinstance(tgt, Node.Node):
|
|
tgt = [tgt]
|
|
if len(src) != len(tgt):
|
|
raise Errors.WafError('invalid number of source/target for %r' % self)
|
|
|
|
for x, y in zip(src, tgt):
|
|
if not x or not y:
|
|
raise Errors.WafError('null source or target for %r' % self)
|
|
a, b = None, None
|
|
|
|
if isinstance(x, str) and isinstance(y, str) and x == y:
|
|
a = self.path.find_node(x)
|
|
b = self.path.get_bld().make_node(y)
|
|
if not os.path.isfile(b.abspath()):
|
|
b.parent.mkdir()
|
|
else:
|
|
if isinstance(x, str):
|
|
a = self.path.find_resource(x)
|
|
elif isinstance(x, Node.Node):
|
|
a = x
|
|
if isinstance(y, str):
|
|
b = self.path.find_or_declare(y)
|
|
elif isinstance(y, Node.Node):
|
|
b = y
|
|
|
|
if not a:
|
|
raise Errors.WafError('could not find %r for %r' % (x, self))
|
|
|
|
has_constraints = False
|
|
tsk = self.create_task('subst', a, b)
|
|
for k in ('after', 'before', 'ext_in', 'ext_out'):
|
|
val = getattr(self, k, None)
|
|
if val:
|
|
has_constraints = True
|
|
setattr(tsk, k, val)
|
|
|
|
# paranoid safety measure for the general case foo.in->foo.h with ambiguous dependencies
|
|
if not has_constraints:
|
|
global HEADER_EXTS
|
|
for xt in HEADER_EXTS:
|
|
if b.name.endswith(xt):
|
|
tsk.before = [k for k in ('c', 'cxx') if k in Task.classes]
|
|
break
|
|
|
|
inst_to = getattr(self, 'install_path', None)
|
|
if inst_to:
|
|
self.install_task = self.add_install_files(install_to=inst_to,
|
|
install_from=b, chmod=getattr(self, 'chmod', Utils.O644))
|
|
|
|
self.source = []
|
|
|