def _protoc_emitter(target, source, env):
"""Process target, sources, and flags"""
# always ignore target
target = []
# suffix
protoc_suffix = env.subst('$PROTOC_SUFFIX')
protoc_h_suffix = env.subst('$PROTOC_HSUFFIX')
protoc_cc_suffix = env.subst('$PROTOC_CCSUFFIX')
protoc_py_suffix = env.subst('$PROTOC_PYSUFFIX')
protoc_java_suffix = env.subst('$PROTOC_JAVASUFFIX')
# fetch all protoc flags
if env['PROTOC_FLAGS']:
protocflags = env.subst("$PROTOC_FLAGS", target=target, source=source)
flags = SCons.Util.CLVar(protocflags)
else:
flags = SCons.Util.CLVar('')
# flag --proto_path, -I
proto_path = []
if env['PROTOC_PATH']:
inc = env['PROTOC_PATH']
if SCons.Util.is_Scalar(inc):
inc = [inc]
inc = [Dir(path) for path in inc]
# by default Dir() makes node which resides in build directory (variant_dir)
# and we want it to be in source directory if duplication is disabled
inc = [path if path.duplicate else path.srcnode() for path in inc]
env['PROTOC_PATH'] = inc
# print "env['PROTOC_PATH']:", map(str, env['PROTOC_PATH'])
for i, path in enumerate(env['PROTOC_PATH']):
# print "path:", path
proto_path.append(path)
flags.append('--proto_path=${PROTOC_PATH[%d]}' % i)
# flag --cpp_out
if env['PROTOC_CCOUT']:
env['PROTOC_CCOUT'] = Dir(env['PROTOC_CCOUT'])
flags.append('--cpp_out=${PROTOC_CCOUT}')
# flag --python_out
if env['PROTOC_PYOUT']:
env['PROTOC_PYOUT'] = Dir(env['PROTOC_PYOUT'])
flags.append('--python_out=${PROTOC_PYOUT}')
# flag --java_out
if env['PROTOC_JAVAOUT']:
env['PROTOC_JAVAOUT'] = Dir(env['PROTOC_JAVAOUT'])
flags.append('--java_out=${PROTOC_JAVAOUT}')
# updated flags
env['PROTOC_FLAGS'] = str(flags)
# print "flags:", flags
# source scons dirs
src_struct = Dir('#')
src_script = Dir('.').srcnode()
# produce proper targets
for src in source:
src = File(src)
if not src.duplicate:
# file is in source directory when duplication is disabled
src = File(src).srcnode()
# print "src.abspath:", src.abspath
# find proto_path for this source
longest_common = '/'
for path in proto_path:
# print "path.abspath:", path.abspath
common = os.path.commonprefix([path.abspath, src.abspath])
if len(common) > len(longest_common):
longest_common = common
# print "longest_common:", longest_common
src_relpath = os.path.relpath(src.abspath, start=longest_common)
# print "src_relpath:", src_relpath
# create stem by remove the $PROTOC_SUFFIX or take a guess
if src_relpath.endswith(protoc_suffix):
stem = src_relpath[:-len(protoc_suffix)]
else:
stem = src_relpath
# print "stem:", stem
# C++ output, append
if env['PROTOC_CCOUT']:
out = Dir(env['PROTOC_CCOUT'])
target.append(out.File(stem + protoc_cc_suffix))
target.append(out.File(stem + protoc_h_suffix))
# python output, append
if env['PROTOC_PYOUT']:
out = Dir(env['PROTOC_PYOUT'])
target.append(out.File(stem + protoc_py_suffix))
# java output, append
if env['PROTOC_JAVAOUT']:
out = Dir(env['PROTOC_JAVAOUT'])
target.append(out.File(stem + protoc_java_suffix))
# print "protoc targets:", env.subst("${TARGETS}", target=target, source=source)
# print "protoc sources:", env.subst("${SOURCES}", target=target, source=source)
# print "protoc command:", env.subst("${PROTOC_COM}", target=target, source=source)
return target, source
