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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2005-2015 (ita)
+
+"base for all c/c++ programs and libraries"
+
+from waflib import Utils, Errors
+from waflib.Configure import conf
+
+def get_extensions(lst):
+ """
+ Returns the file extensions for the list of files given as input
+
+ :param lst: files to process
+ :list lst: list of string or :py:class:`waflib.Node.Node`
+ :return: list of file extensions
+ :rtype: list of string
+ """
+ ret = []
+ for x in Utils.to_list(lst):
+ if not isinstance(x, str):
+ x = x.name
+ ret.append(x[x.rfind('.') + 1:])
+ return ret
+
+def sniff_features(**kw):
+ """
+ Computes and returns the features required for a task generator by
+ looking at the file extensions. This aimed for C/C++ mainly::
+
+ snif_features(source=['foo.c', 'foo.cxx'], type='shlib')
+ # returns ['cxx', 'c', 'cxxshlib', 'cshlib']
+
+ :param source: source files to process
+ :type source: list of string or :py:class:`waflib.Node.Node`
+ :param type: object type in *program*, *shlib* or *stlib*
+ :type type: string
+ :return: the list of features for a task generator processing the source files
+ :rtype: list of string
+ """
+ exts = get_extensions(kw['source'])
+ typ = kw['typ']
+ feats = []
+
+ # watch the order, cxx will have the precedence
+ for x in 'cxx cpp c++ cc C'.split():
+ if x in exts:
+ feats.append('cxx')
+ break
+
+ if 'c' in exts or 'vala' in exts or 'gs' in exts:
+ feats.append('c')
+
+ for x in 'f f90 F F90 for FOR'.split():
+ if x in exts:
+ feats.append('fc')
+ break
+
+ if 'd' in exts:
+ feats.append('d')
+
+ if 'java' in exts:
+ feats.append('java')
+ return 'java'
+
+ if typ in ('program', 'shlib', 'stlib'):
+ will_link = False
+ for x in feats:
+ if x in ('cxx', 'd', 'fc', 'c'):
+ feats.append(x + typ)
+ will_link = True
+ if not will_link and not kw.get('features', []):
+ raise Errors.WafError('Cannot link from %r, try passing eg: features="c cprogram"?' % kw)
+ return feats
+
+def set_features(kw, typ):
+ """
+ Inserts data in the input dict *kw* based on existing data and on the type of target
+ required (typ).
+
+ :param kw: task generator parameters
+ :type kw: dict
+ :param typ: type of target
+ :type typ: string
+ """
+ kw['typ'] = typ
+ kw['features'] = Utils.to_list(kw.get('features', [])) + Utils.to_list(sniff_features(**kw))
+
+@conf
+def program(bld, *k, **kw):
+ """
+ Alias for creating programs by looking at the file extensions::
+
+ def build(bld):
+ bld.program(source='foo.c', target='app')
+ # equivalent to:
+ # bld(features='c cprogram', source='foo.c', target='app')
+
+ """
+ set_features(kw, 'program')
+ return bld(*k, **kw)
+
+@conf
+def shlib(bld, *k, **kw):
+ """
+ Alias for creating shared libraries by looking at the file extensions::
+
+ def build(bld):
+ bld.shlib(source='foo.c', target='app')
+ # equivalent to:
+ # bld(features='c cshlib', source='foo.c', target='app')
+
+ """
+ set_features(kw, 'shlib')
+ return bld(*k, **kw)
+
+@conf
+def stlib(bld, *k, **kw):
+ """
+ Alias for creating static libraries by looking at the file extensions::
+
+ def build(bld):
+ bld.stlib(source='foo.cpp', target='app')
+ # equivalent to:
+ # bld(features='cxx cxxstlib', source='foo.cpp', target='app')
+
+ """
+ set_features(kw, 'stlib')
+ return bld(*k, **kw)
+
+@conf
+def objects(bld, *k, **kw):
+ """
+ Alias for creating object files by looking at the file extensions::
+
+ def build(bld):
+ bld.objects(source='foo.c', target='app')
+ # equivalent to:
+ # bld(features='c', source='foo.c', target='app')
+
+ """
+ set_features(kw, 'objects')
+ return bld(*k, **kw)
+