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#! /usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2010-2015
import re
from waflib import Task, Logs
from waflib.TaskGen import extension
cy_api_pat = re.compile(r'\s*?cdef\s*?(public|api)\w*')
re_cyt = re.compile(r"""
(?:from\s+(\w+)\s+)? # optionally match "from foo" and capture foo
c?import\s(\w+|[*]) # require "import bar" and capture bar
""", re.M | re.VERBOSE)
@extension('.pyx')
def add_cython_file(self, node):
"""
Process a *.pyx* file given in the list of source files. No additional
feature is required::
def build(bld):
bld(features='c cshlib pyext', source='main.c foo.pyx', target='app')
"""
ext = '.c'
if 'cxx' in self.features:
self.env.append_unique('CYTHONFLAGS', '--cplus')
ext = '.cc'
for x in getattr(self, 'cython_includes', []):
# TODO re-use these nodes in "scan" below
d = self.path.find_dir(x)
if d:
self.env.append_unique('CYTHONFLAGS', '-I%s' % d.abspath())
tsk = self.create_task('cython', node, node.change_ext(ext))
self.source += tsk.outputs
class cython(Task.Task):
run_str = '${CYTHON} ${CYTHONFLAGS} -o ${TGT[0].abspath()} ${SRC}'
color = 'GREEN'
vars = ['INCLUDES']
"""
Rebuild whenever the INCLUDES change. The variables such as CYTHONFLAGS will be appended
by the metaclass.
"""
ext_out = ['.h']
"""
The creation of a .h file is known only after the build has begun, so it is not
possible to compute a build order just by looking at the task inputs/outputs.
"""
def runnable_status(self):
"""
Perform a double-check to add the headers created by cython
to the output nodes. The scanner is executed only when the cython task
must be executed (optimization).
"""
ret = super(cython, self).runnable_status()
if ret == Task.ASK_LATER:
return ret
for x in self.generator.bld.raw_deps[self.uid()]:
if x.startswith('header:'):
self.outputs.append(self.inputs[0].parent.find_or_declare(x.replace('header:', '')))
return super(cython, self).runnable_status()
def post_run(self):
for x in self.outputs:
if x.name.endswith('.h'):
if not x.exists():
if Logs.verbose:
Logs.warn('Expected %r', x.abspath())
x.write('')
return Task.Task.post_run(self)
def scan(self):
"""
Return the dependent files (.pxd) by looking in the include folders.
Put the headers to generate in the custom list "bld.raw_deps".
To inspect the scanne results use::
$ waf clean build --zones=deps
"""
node = self.inputs[0]
txt = node.read()
mods = []
for m in re_cyt.finditer(txt):
if m.group(1): # matches "from foo import bar"
mods.append(m.group(1))
else:
mods.append(m.group(2))
Logs.debug('cython: mods %r', mods)
incs = getattr(self.generator, 'cython_includes', [])
incs = [self.generator.path.find_dir(x) for x in incs]
incs.append(node.parent)
found = []
missing = []
for x in mods:
for y in incs:
k = y.find_resource(x + '.pxd')
if k:
found.append(k)
break
else:
missing.append(x)
# the cython file implicitly depends on a pxd file that might be present
implicit = node.parent.find_resource(node.name[:-3] + 'pxd')
if implicit:
found.append(implicit)
Logs.debug('cython: found %r', found)
# Now the .h created - store them in bld.raw_deps for later use
has_api = False
has_public = False
for l in txt.splitlines():
if cy_api_pat.match(l):
if ' api ' in l:
has_api = True
if ' public ' in l:
has_public = True
name = node.name.replace('.pyx', '')
if has_api:
missing.append('header:%s_api.h' % name)
if has_public:
missing.append('header:%s.h' % name)
return (found, missing)
def options(ctx):
ctx.add_option('--cython-flags', action='store', default='', help='space separated list of flags to pass to cython')
def configure(ctx):
if not ctx.env.CC and not ctx.env.CXX:
ctx.fatal('Load a C/C++ compiler first')
if not ctx.env.PYTHON:
ctx.fatal('Load the python tool first!')
ctx.find_program('cython', var='CYTHON')
if ctx.options.cython_flags:
ctx.env.CYTHONFLAGS = ctx.options.cython_flags
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