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waf/waflib/extras/protoc.py

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#!/usr/bin/env python
# encoding: utf-8
# Philipp Bender, 2012
# Matt Clarkson, 2012
import re, os
from waflib.Task import Task
from waflib.TaskGen import extension
from waflib import Errors, Context
"""
A simple tool to integrate protocol buffers into your build system.
Example for C++:
def configure(conf):
conf.load('compiler_cxx cxx protoc')
def build(bld):
bld(
features = 'cxx cxxprogram'
source = 'main.cpp file1.proto proto/file2.proto',
includes = '. proto',
target = 'executable')
Example for Python:
def configure(conf):
conf.load('python protoc')
def build(bld):
bld(
features = 'py'
source = 'main.py file1.proto proto/file2.proto',
protoc_includes = 'proto')
Example for both Python and C++ at same time:
def configure(conf):
conf.load('cxx python protoc')
def build(bld):
bld(
features = 'cxx py'
source = 'file1.proto proto/file2.proto',
protoc_includes = 'proto') # or includes
Example for Java:
def options(opt):
opt.load('java')
def configure(conf):
conf.load('python java protoc')
# Here you have to point to your protobuf-java JAR and have it in classpath
conf.env.CLASSPATH_PROTOBUF = ['protobuf-java-2.5.0.jar']
def build(bld):
bld(
features = 'javac protoc',
name = 'pbjava',
srcdir = 'inc/ src', # directories used by javac
source = ['inc/message_inc.proto', 'inc/message.proto'],
# source is used by protoc for .proto files
use = 'PROTOBUF',
protoc_includes = ['inc']) # for protoc to search dependencies
Protoc includes passed via protoc_includes are either relative to the taskgen
or to the project and are searched in this order.
Include directories external to the waf project can also be passed to the
extra by using protoc_extincludes
protoc_extincludes = ['/usr/include/pblib']
Notes when using this tool:
- protoc command line parsing is tricky.
The generated files can be put in subfolders which depend on
the order of the include paths.
Try to be simple when creating task generators
containing protoc stuff.
"""
class protoc(Task):
run_str = '${PROTOC} ${PROTOC_FL:PROTOC_FLAGS} ${PROTOC_ST:INCPATHS} ${PROTOC_ST:PROTOC_INCPATHS} ${PROTOC_ST:PROTOC_EXTINCPATHS} ${SRC[0].bldpath()}'
color = 'BLUE'
ext_out = ['.h', 'pb.cc', '.py', '.java']
def scan(self):
"""
Scan .proto dependencies
"""
node = self.inputs[0]
nodes = []
names = []
seen = []
search_nodes = []
if not node:
return (nodes, names)
if 'cxx' in self.generator.features:
search_nodes = self.generator.includes_nodes
if 'py' in self.generator.features or 'javac' in self.generator.features:
for incpath in getattr(self.generator, 'protoc_includes', []):
incpath_node = self.generator.path.find_node(incpath)
if incpath_node:
search_nodes.append(incpath_node)
else:
# Check if relative to top-level for extra tg dependencies
incpath_node = self.generator.bld.path.find_node(incpath)
if incpath_node:
search_nodes.append(incpath_node)
else:
raise Errors.WafError('protoc: include path %r does not exist' % incpath)
def parse_node(node):
if node in seen:
return
seen.append(node)
code = node.read().splitlines()
for line in code:
m = re.search(r'^import\s+"(.*)";.*(//)?.*', line)
if m:
dep = m.groups()[0]
for incnode in search_nodes:
found = incnode.find_resource(dep)
if found:
nodes.append(found)
parse_node(found)
else:
names.append(dep)
parse_node(node)
# Add also dependencies path to INCPATHS so protoc will find the included file
for deppath in nodes:
self.env.append_unique('INCPATHS', deppath.parent.bldpath())
return (nodes, names)
@extension('.proto')
def process_protoc(self, node):
incdirs = []
out_nodes = []
protoc_flags = []
# ensure PROTOC_FLAGS is a list; a copy is used below anyway
self.env.PROTOC_FLAGS = self.to_list(self.env.PROTOC_FLAGS)
if 'cxx' in self.features:
cpp_node = node.change_ext('.pb.cc')
hpp_node = node.change_ext('.pb.h')
self.source.append(cpp_node)
out_nodes.append(cpp_node)
out_nodes.append(hpp_node)
protoc_flags.append('--cpp_out=%s' % node.parent.get_bld().bldpath())
if 'py' in self.features:
py_node = node.change_ext('_pb2.py')
self.source.append(py_node)
out_nodes.append(py_node)
protoc_flags.append('--python_out=%s' % node.parent.get_bld().bldpath())
if 'javac' in self.features:
pkgname, javapkg, javacn, nodename = None, None, None, None
messages = []
# .java file name is done with some rules depending on .proto file content:
# -) package is either derived from option java_package if present
# or from package directive
# -) file name is either derived from option java_outer_classname if present
# or the .proto file is converted to camelcase. If a message
# is named the same then the behaviour depends on protoc version
#
# See also: https://developers.google.com/protocol-buffers/docs/reference/java-generated#invocation
code = node.read().splitlines()
for line in code:
m = re.search(r'^package\s+(.*);', line)
if m:
pkgname = m.groups()[0]
m = re.search(r'^option\s+(\S*)\s*=\s*"(\S*)";', line)
if m:
optname = m.groups()[0]
if optname == 'java_package':
javapkg = m.groups()[1]
elif optname == 'java_outer_classname':
javacn = m.groups()[1]
if self.env.PROTOC_MAJOR > '2':
m = re.search(r'^message\s+(\w*)\s*{*', line)
if m:
messages.append(m.groups()[0])
if javapkg:
nodename = javapkg
elif pkgname:
nodename = pkgname
else:
raise Errors.WafError('Cannot derive java name from protoc file')
nodename = nodename.replace('.',os.sep) + os.sep
if javacn:
nodename += javacn + '.java'
else:
filenamebase = node.abspath()[node.abspath().rfind(os.sep)+1:node.abspath().rfind('.')].replace('_','')
filenamebase = filenamebase[:1].upper() + filenamebase[1:]
if self.env.PROTOC_MAJOR > '2' and node.abspath()[node.abspath().rfind(os.sep)+1:node.abspath().rfind('.')].title() in messages:
nodename += filenamebase + 'OuterClass.java'
else:
nodename += filenamebase + '.java'
java_node = node.parent.find_or_declare(nodename)
out_nodes.append(java_node)
protoc_flags.append('--java_out=%s' % node.parent.get_bld().bldpath())
# Make javac get also pick java code generated in build
if not node.parent.get_bld() in self.javac_task.srcdir:
self.javac_task.srcdir.append(node.parent.get_bld())
if not out_nodes:
raise Errors.WafError('Feature %r not supported by protoc extra' % self.features)
tsk = self.create_task('protoc', node, out_nodes)
tsk.env.append_value('PROTOC_FLAGS', protoc_flags)
if 'javac' in self.features:
self.javac_task.set_run_after(tsk)
# Instruct protoc where to search for .proto included files.
# For C++ standard include files dirs are used,
# but this doesn't apply to Python for example
for incpath in getattr(self, 'protoc_includes', []):
incpath_node = self.path.find_node(incpath)
if incpath_node:
incdirs.append(incpath_node.bldpath())
else:
# Check if relative to top-level for extra tg dependencies
incpath_node = self.bld.path.find_node(incpath)
if incpath_node:
incdirs.append(incpath_node.bldpath())
else:
raise Errors.WafError('protoc: include path %r does not exist' % incpath)
tsk.env.PROTOC_INCPATHS = incdirs
# Include paths external to the waf project (ie. shared pb repositories)
tsk.env.PROTOC_EXTINCPATHS = getattr(self, 'protoc_extincludes', [])
# PR2115: protoc generates output of .proto files in nested
# directories by canonicalizing paths. To avoid this we have to pass
# as first include the full directory file of the .proto file
tsk.env.prepend_value('INCPATHS', node.parent.bldpath())
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.start_msg('Checking for protoc version')
protocver = conf.cmd_and_log(conf.env.PROTOC + ['--version'], output=Context.BOTH)
protocver = ''.join(protocver).strip()[protocver[0].rfind(' ')+1:]
conf.end_msg(protocver)
conf.env.PROTOC_MAJOR = protocver[:protocver.find('.')]
conf.env.PROTOC_ST = '-I%s'
conf.env.PROTOC_FL = '%s'
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