waf/waflib/extras/protoc.py

#!/usr/bin/env python
# encoding: utf-8
# Philipp Bender, 2012
# Matt Clarkson, 2012

import re
from waflib.Task import Task
from waflib.TaskGen import extension 

"""
A simple tool to integrate protocol buffers into your build system.

    def configure(conf):
        conf.load('compiler_cxx cxx protoc')

    def build(bld):
        bld(
                features = 'cxx cxxprogram'
                source   = 'main.cpp file1.proto proto/file2.proto', 
                include  = '. proto',
                target   = 'executable') 

"""

class protoc(Task):
	run_str = '${PROTOC} ${PROTOC_FLAGS} ${PROTOC_ST:INCPATHS} ${SRC[0].abspath()}'
	color   = 'BLUE'
	ext_out = ['.h', 'pb.cc']
	def scan(self):
		"""
		Scan .proto dependencies
		"""
		node = self.inputs[0]

		nodes = []
		names = []
		seen = []

		if not node: return (nodes, names)

		search_paths = [self.generator.path.find_node(x) for x in self.generator.includes]

		def parse_node(node):
			if node in seen:
				return
			seen.append(node)
			code = node.read().split("\n")
			for line in code:
				m = re.search(r'^import\s+"(.*)";.*(//)?.*', line)
				if m:
					dep = m.groups()[0]
					for incpath in search_paths:
						found = incpath.find_resource(dep)
						if found:
							nodes.append(found)
							parse_node(found)
						else:
							names.append(dep)

		parse_node(node)
		return (nodes, names)

@extension('.proto')
def process_protoc(self, node):
	cpp_node = node.change_ext('.pb.cc')
	hpp_node = node.change_ext('.pb.h')
	self.create_task('protoc', node, [cpp_node, hpp_node])
	self.source.append(cpp_node)

	if 'cxx' in self.features and not self.env.PROTOC_FLAGS:
		self.env.PROTOC_FLAGS = '--cpp_out=%s' % node.parent.get_bld().abspath()

	use = getattr(self, 'use', '')
	if not 'PROTOBUF' in use:
		self.use = self.to_list(use) + ['PROTOBUF']

def configure(conf):
	conf.check_cfg(package="protobuf", uselib_store="PROTOBUF", args=['--cflags', '--libs'])
	conf.find_program('protoc', var='PROTOC')
	conf.env.PROTOC_ST = '-I%s'