1 files changed, 146 insertions, 0 deletions
diff --git a/extras/cython.py b/extras/cython.py
new file mode 100644
index 00000000..481d6f4c
--- /dev/null
+++ b/extras/cython.py
@@ -0,0 +1,146 @@
+#! /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 hasattr(ctx.options, 'cython_flags'):
+		ctx.env.CYTHONFLAGS = ctx.options.cython_flags
+