mirror of
https://gitlab.com/ita1024/waf.git
synced 2024-11-17 23:46:53 +01:00
756 lines
21 KiB
Python
756 lines
21 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2005-2010 (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 always postponed. To achieve this, various methods are called from the method "apply"
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"""
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import copy, re, os
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from waflib import Task, Utils, Logs, Errors, ConfigSet
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feats = Utils.defaultdict(set)
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"""remember the methods declaring features"""
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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 = {}
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prec = Utils.defaultdict(list)
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def __init__(self, *k, **kw):
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"""
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The 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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The 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 ease the method re-use.
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The extra key/value elements passed in kw are set as attributes
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"""
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# so we will have to play with directed acyclic graphs
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# detect cycles, etc
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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 (it is usually a good idea to avoid touching this)
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"""
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self.prec = Utils.defaultdict(list)
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"""
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Precedence table for sorting the methods in self.meths
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"""
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self.mappings = {}
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"""
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List of mappings {extension -> function} for processing files by extension
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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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List of tasks created.
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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[id(self.path)] = self.bld.idx.get(id(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[id(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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"""for debugging purposes"""
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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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"""for debugging purposes"""
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lst = []
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for x in self.__dict__.keys():
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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_name(self):
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"""
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If not set, 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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Ensure that a parameter is a 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): return val.split()
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else: return val
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def post(self):
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"""
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Create task objects. 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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# we could add a decorator to let the task run once, but then python 2.3 will be difficult to support
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if getattr(self, 'posted', None):
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#error("OBJECT ALREADY POSTED" + str( self))
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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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# 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 not st:
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if 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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keys.update(list(st)) # ironpython 2.7 wants the cast to list
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# copy the precedence table
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prec = {}
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prec_tbl = self.prec or task_gen.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: 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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raise Errors.WafError('Cycle detected in the method execution %r' % prec)
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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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: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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if name.endswith(k):
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return self.mappings[k]
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for k in task_gen.mappings:
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if name.endswith(k):
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return task_gen.mappings[k]
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raise Errors.WafError("File %r has no mapping in %r (did you forget to load a waf tool?)" % (node, task_gen.mappings.keys()))
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def create_task(self, name, src=None, tgt=None):
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"""
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Wrapper for creating task objects easily
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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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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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Make a copy of a task generator. Once the copy is made, it is necessary to ensure that the
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task generator does not create the same output files as the original, or the same files may
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be compiled twice.
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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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Create 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, use it to create the output nodes for the task
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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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ext = decider and decider(self, node) or cls.ext_out
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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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keys = self.mappings.keys() + self.__class__.mappings.keys()
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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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for y in keys: # ~ 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.bld.install_files(install_path, 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: register a 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: register 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: register a 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: register 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: register 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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Convert 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, self.path.__class__):
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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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"""
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Process each element in the attribute ``source`` by extension.
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#. The *source* list is converted through :py:meth:`waflib.TaskGen.to_nodes` to a list of :py:class:`waflib.Node.Node` first.
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#. File extensions are mapped to methods having the signature: ``def meth(self, node)`` by :py:meth:`waflib.TaskGen.extension`
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#. The method is retrieved through :py:meth:`waflib.TaskGen.task_gen.get_hook`
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#. When called, the methods may modify self.source to append more source to process
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#. 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):
|
|
"""
|
|
Process 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 self.rule)
|
|
cls = Task.task_factory(name, self.rule,
|
|
getattr(self, 'vars', []),
|
|
shell=getattr(self, 'shell', True), color=getattr(self, 'color', 'BLUE'))
|
|
|
|
# now create one instance
|
|
tsk = self.create_task(name)
|
|
|
|
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):
|
|
# from waf 1.5
|
|
# although convenient, it does not 1. allow to name the target file and 2. symlinks
|
|
# TODO remove in waf 1.7
|
|
self.bld.install_files(self.install_path, tsk.outputs)
|
|
|
|
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, 'scan', None):
|
|
cls.scan = self.scan
|
|
elif getattr(self, 'deps', None):
|
|
def scan(self):
|
|
nodes = []
|
|
for x in self.generator.to_list(self.generator.deps):
|
|
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
|
|
|
|
if getattr(self, 'cwd', None):
|
|
tsk.cwd = self.cwd
|
|
|
|
if getattr(self, 'update_outputs', None):
|
|
Task.update_outputs(cls)
|
|
|
|
if getattr(self, 'always', None):
|
|
Task.always_run(cls)
|
|
|
|
for x in ['after', 'before', 'ext_in', 'ext_out']:
|
|
setattr(cls, x, getattr(self, x, []))
|
|
|
|
@feature('seq')
|
|
def sequence_order(self):
|
|
"""
|
|
Add 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):
|
|
"""
|
|
Create *.pc* files from *.pc.in*. The task is executed whenever an input variable used
|
|
in the substitution changes.
|
|
"""
|
|
|
|
def run(self):
|
|
"Substitutes variables in a .in file"
|
|
|
|
code = self.inputs[0].read()
|
|
|
|
# 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 ''
|
|
code = 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.get_flat(x) or self.env.get_flat(x.upper())
|
|
d[x] = str(tmp)
|
|
|
|
self.outputs[0].write(code % d)
|
|
self.generator.bld.raw_deps[self.uid()] = self.dep_vars = lst
|
|
|
|
# make sure the signature is updated
|
|
try: delattr(self, 'cache_sig')
|
|
except AttributeError: pass
|
|
|
|
if getattr(self.generator, 'chmod', None):
|
|
os.chmod(self.outputs[0].abspath(), self.generator.chmod)
|
|
|
|
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
|
|
|
|
# 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):
|
|
"""
|
|
Process *.pc.in* files to *.pc*. Install the results to ``${PREFIX}/lib/pkgconfig/``
|
|
|
|
def build(bld):
|
|
bld(source='foo.pc.in', install_path='${LIBDIR}/pkgconfig/')
|
|
"""
|
|
tsk = self.create_task('subst_pc', node, node.change_ext('.pc', '.pc.in'))
|
|
self.bld.install_files(getattr(self, 'install_path', '${LIBDIR}/pkgconfig/'), tsk.outputs)
|
|
|
|
class subst(subst_pc):
|
|
pass
|
|
|
|
@feature('subst')
|
|
@before_method('process_source', 'process_rule')
|
|
def process_subst(self):
|
|
"""
|
|
Define 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 = self.to_nodes(getattr(self, 'source', []))
|
|
tgt = getattr(self, 'target', [])
|
|
if isinstance(tgt, self.path.__class__):
|
|
tgt = [tgt]
|
|
tgt = [isinstance(x, self.path.__class__) and x or self.path.find_or_declare(x) for x in Utils.to_list(tgt)]
|
|
|
|
if len(src) != len(tgt):
|
|
raise Errors.WafError('invalid source or target for %r' % self)
|
|
|
|
for x, y in zip(src, tgt):
|
|
if not (x and y):
|
|
raise Errors.WafError('invalid source or target for %r' % self)
|
|
tsk = self.create_task('subst', x, y)
|
|
for a in ('after', 'before', 'ext_in', 'ext_out'):
|
|
val = getattr(self, a, None)
|
|
if val:
|
|
setattr(tsk, a, val)
|
|
|
|
inst_to = getattr(self, 'install_path', None)
|
|
if inst_to:
|
|
self.bld.install_files(inst_to, tgt, chmod=getattr(self, 'chmod', Utils.O644))
|
|
|
|
self.source = []
|
|
|