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b3d974a0b9
There can be multiple imports of the same module in a single file, so avoid evaluating them multiple times.
148 lines
4.1 KiB
Python
148 lines
4.1 KiB
Python
#! /usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2010-2015
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import re
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from waflib import Task, Logs
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from waflib.TaskGen import extension
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cy_api_pat = re.compile(r'\s*?cdef\s*?(public|api)\w*')
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re_cyt = re.compile(r"""
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^\s* # must begin with some whitespace characters
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(?:from\s+(\w+)(?:\.\w+)*\s+)? # optionally match "from foo(.baz)" and capture foo
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c?import\s(\w+|[*]) # require "import bar" and capture bar
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""", re.M | re.VERBOSE)
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@extension('.pyx')
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def add_cython_file(self, node):
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"""
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Process a *.pyx* file given in the list of source files. No additional
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feature is required::
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def build(bld):
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bld(features='c cshlib pyext', source='main.c foo.pyx', target='app')
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"""
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ext = '.c'
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if 'cxx' in self.features:
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self.env.append_unique('CYTHONFLAGS', '--cplus')
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ext = '.cc'
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for x in getattr(self, 'cython_includes', []):
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# TODO re-use these nodes in "scan" below
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d = self.path.find_dir(x)
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if d:
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self.env.append_unique('CYTHONFLAGS', '-I%s' % d.abspath())
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tsk = self.create_task('cython', node, node.change_ext(ext))
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self.source += tsk.outputs
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class cython(Task.Task):
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run_str = '${CYTHON} ${CYTHONFLAGS} -o ${TGT[0].abspath()} ${SRC}'
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color = 'GREEN'
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vars = ['INCLUDES']
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"""
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Rebuild whenever the INCLUDES change. The variables such as CYTHONFLAGS will be appended
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by the metaclass.
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"""
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ext_out = ['.h']
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"""
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The creation of a .h file is known only after the build has begun, so it is not
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possible to compute a build order just by looking at the task inputs/outputs.
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"""
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def runnable_status(self):
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"""
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Perform a double-check to add the headers created by cython
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to the output nodes. The scanner is executed only when the cython task
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must be executed (optimization).
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"""
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ret = super(cython, self).runnable_status()
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if ret == Task.ASK_LATER:
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return ret
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for x in self.generator.bld.raw_deps[self.uid()]:
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if x.startswith('header:'):
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self.outputs.append(self.inputs[0].parent.find_or_declare(x.replace('header:', '')))
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return super(cython, self).runnable_status()
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def post_run(self):
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for x in self.outputs:
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if x.name.endswith('.h'):
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if not x.exists():
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if Logs.verbose:
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Logs.warn('Expected %r', x.abspath())
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x.write('')
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return Task.Task.post_run(self)
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def scan(self):
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"""
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Return the dependent files (.pxd) by looking in the include folders.
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Put the headers to generate in the custom list "bld.raw_deps".
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To inspect the scanne results use::
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$ waf clean build --zones=deps
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"""
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node = self.inputs[0]
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txt = node.read()
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mods = set()
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for m in re_cyt.finditer(txt):
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if m.group(1): # matches "from foo import bar"
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mods.add(m.group(1))
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else:
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mods.add(m.group(2))
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Logs.debug('cython: mods %r', mods)
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incs = getattr(self.generator, 'cython_includes', [])
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incs = [self.generator.path.find_dir(x) for x in incs]
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incs.append(node.parent)
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found = []
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missing = []
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for x in sorted(mods):
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for y in incs:
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k = y.find_resource(x + '.pxd')
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if k:
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found.append(k)
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break
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else:
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missing.append(x)
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# the cython file implicitly depends on a pxd file that might be present
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implicit = node.parent.find_resource(node.name[:-3] + 'pxd')
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if implicit:
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found.append(implicit)
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Logs.debug('cython: found %r', found)
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# Now the .h created - store them in bld.raw_deps for later use
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has_api = False
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has_public = False
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for l in txt.splitlines():
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if cy_api_pat.match(l):
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if ' api ' in l:
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has_api = True
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if ' public ' in l:
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has_public = True
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name = node.name.replace('.pyx', '')
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if has_api:
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missing.append('header:%s_api.h' % name)
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if has_public:
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missing.append('header:%s.h' % name)
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return (found, missing)
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def options(ctx):
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ctx.add_option('--cython-flags', action='store', default='', help='space separated list of flags to pass to cython')
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def configure(ctx):
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if not ctx.env.CC and not ctx.env.CXX:
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ctx.fatal('Load a C/C++ compiler first')
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if not ctx.env.PYTHON:
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ctx.fatal('Load the python tool first!')
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ctx.find_program('cython', var='CYTHON')
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if hasattr(ctx.options, 'cython_flags'):
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ctx.env.CYTHONFLAGS = ctx.options.cython_flags
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