path: root/SCons/BuilderTests.py

# MIT License
#
# Copyright The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import SCons.compat

# Define a null function for use as a builder action.
# Where this is defined in the file seems to affect its
# byte-code contents, so try to minimize changes by
# defining it here, before we even import anything.
def Func():
    pass

from collections import UserList
import io
import os.path
import re
import sys
import unittest

import TestCmd

import SCons.Action
import SCons.Builder
import SCons.Environment
import SCons.Errors
import SCons.Subst
import SCons.Util

sys.stdout = io.StringIO()

# Initial setup of the common environment for all tests,
# a temporary working directory containing a
# script for writing arguments to an output file.
#
# We don't do this as a setUp() method because it's
# unnecessary to create a separate directory and script
# for each test, they can just use the one.
test = TestCmd.TestCmd(workdir = '')

outfile = test.workpath('outfile')
outfile2 = test.workpath('outfile2')

infile = test.workpath('infile')
test.write(infile, "infile\n")

show_string = None

scons_env = SCons.Environment.Environment()

env_arg2nodes_called = None

class Environment:
    def __init__(self, **kw):
        self.d = {}
        self.d['SHELL'] = scons_env['SHELL']
        self.d['SPAWN'] = scons_env['SPAWN']
        self.d['ESCAPE'] = scons_env['ESCAPE']
        for k, v in kw.items():
            self.d[k] = v
        global env_arg2nodes_called
        env_arg2nodes_called = None
        self.scanner = None
        self.fs = SCons.Node.FS.FS()
    def subst(self, s):
        if not SCons.Util.is_String(s):
            return s
        def substitute(m, d=self.d):
            return d.get(m.group(1), '')
        return re.sub(r'\$(\w+)', substitute, s)
    def subst_target_source(self, string, raw=0, target=None,
                            source=None, dict=None, conv=None):
        return SCons.Subst.scons_subst(string, self, raw, target,
                                       source, dict, conv)
    def subst_list(self, string, raw=0, target=None, source=None, conv=None):
        return SCons.Subst.scons_subst_list(string, self, raw, target,
                                            source, {}, {}, conv)
    def arg2nodes(self, args, factory, **kw):
        global env_arg2nodes_called
        env_arg2nodes_called = 1
        if not SCons.Util.is_List(args):
            args = [args]
        list = []
        for a in args:
            if SCons.Util.is_String(a):
                a = factory(self.subst(a))
            list.append(a)
        return list
    def get_factory(self, factory):
        return factory or self.fs.File
    def get_scanner(self, ext):
        return self.scanner
    def Dictionary(self):
        return {}
    def autogenerate(self, dir=''):
        return {}
    def __setitem__(self, item, var):
        self.d[item] = var
    def __getitem__(self, item):
        return self.d[item]
    def __contains__(self, key):
        return key in self.d
    def keys(self):
        return list(self.d.keys())
    def get(self, key, value=None):
        return self.d.get(key, value)
    def Override(self, overrides):
        env = Environment(**self.d)
        env.d.update(overrides)
        env.scanner = self.scanner
        return env
    def _update(self, dict):
        self.d.update(dict)
    def items(self):
        return list(self.d.items())
    def sig_dict(self):
        d = {}
        for k,v in self.items(): d[k] = v
        d['TARGETS'] = ['__t1__', '__t2__', '__t3__', '__t4__', '__t5__', '__t6__']
        d['TARGET'] = d['TARGETS'][0]
        d['SOURCES'] = ['__s1__', '__s2__', '__s3__', '__s4__', '__s5__', '__s6__']
        d['SOURCE'] = d['SOURCES'][0]
        return d
    def __eq__(self, other):
        return self.scanner == other.scanner or self.d == other.d

class MyAction:
    def __init__(self, action):
        self.action = action
    def __call__(self, *args, **kw):
        pass
    def get_executor(self, env, overrides, tlist, slist, executor_kw):
        return ['executor'] + [self.action]

class MyNode_without_target_from_source:
    def __init__(self, name):
        self.name = name
        self.sources = []
        self.builder = None
        self.is_explicit = None
        self.side_effect = 0
    def get_suffix(self):
        return os.path.splitext(self.name)[1]
    def disambiguate(self):
        return self
    def __str__(self):
        return self.name
    def builder_set(self, builder):
        self.builder = builder
    def has_builder(self):
        return self.builder is not None
    def set_explicit(self, is_explicit):
        self.is_explicit = is_explicit
    def has_explicit_builder(self):
        return self.is_explicit
    def env_set(self, env, safe=0):
        self.env = env
    def add_source(self, source):
        self.sources.extend(source)
    def scanner_key(self):
        return self.name
    def is_derived(self):
        return self.has_builder()
    def generate_build_env(self, env):
        return env
    def get_build_env(self):
        return self.executor.get_build_env()
    def set_executor(self, executor):
        self.executor = executor
    def get_executor(self, create=1):
        return self.executor

class MyNode(MyNode_without_target_from_source):
    def target_from_source(self, prefix, suffix, stripext):
        return MyNode(prefix + stripext(str(self))[0] + suffix)

class BuilderTestCase(unittest.TestCase):

    def test__init__(self):
        """Test simple Builder creation
        """
        builder = SCons.Builder.Builder(action="foo")
        assert builder is not None, builder
        builder = SCons.Builder.Builder(action="foo", OVERRIDE='x')
        x = builder.overrides['OVERRIDE']
        assert x == 'x', x

    def test__bool__(self):
        """Test a builder raising an exception when __bool__ is called. """

        # basic test: explicitly call it
        builder = SCons.Builder.Builder(action="foo")
        exc_caught = None
        try:
            builder.__bool__()
        except SCons.Errors.InternalError:
            exc_caught = 1
        assert exc_caught, "did not catch expected InternalError exception"

        class Node:
             pass

        # the interesting test: checking the attribute this way
        # should call back to Builder.__bool__ - so we can tell
        # people not to check that way (for performance).
        # TODO: workaround #3860: with just a "pass" in the check body,
        # py3.10a optimizes out the whole thing, so add a "real" stmt
        n = Node()
        n.builder = builder
        exc_caught = None
        try:
            if n.builder:
                #pass
                _ = True
        except SCons.Errors.InternalError:
            exc_caught = 1
        assert exc_caught, "did not catch expected InternalError exception"

    def test__call__(self):
        """Test calling a builder to establish source dependencies
        """
        env = Environment()
        builder = SCons.Builder.Builder(action="foo",
                                        target_factory=MyNode,
                                        source_factory=MyNode)

        tgt = builder(env, source=[])
        assert tgt == [], tgt

        n1 = MyNode("n1")
        n2 = MyNode("n2")
        builder(env, target = n1, source = n2)
        assert env_arg2nodes_called
        assert n1.env == env, n1.env
        assert n1.builder == builder, n1.builder
        assert n1.sources == [n2], n1.sources
        assert n1.executor, "no executor found"
        assert not hasattr(n2, 'env')

        l = [1]
        ul = UserList([2])
        try:
            l.extend(ul)
        except TypeError:
            def mystr(l):
                return str(list(map(str, l)))
        else:
            mystr = str

        nnn1 = MyNode("nnn1")
        nnn2 = MyNode("nnn2")
        tlist = builder(env, target = [nnn1, nnn2], source = [])
        s = mystr(tlist)
        assert s == "['nnn1', 'nnn2']", s
        l = list(map(str, tlist))
        assert l == ['nnn1', 'nnn2'], l

        tlist = builder(env, target = 'n3', source = 'n4')
        s = mystr(tlist)
        assert s == "['n3']", s
        target = tlist[0]
        l = list(map(str, tlist))
        assert l == ['n3'], l
        assert target.name == 'n3'
        assert target.sources[0].name == 'n4'

        tlist = builder(env, target = 'n4 n5', source = ['n6 n7'])
        s = mystr(tlist)
        assert s == "['n4 n5']", s
        l = list(map(str, tlist))
        assert l == ['n4 n5'], l
        target = tlist[0]
        assert target.name == 'n4 n5'
        assert target.sources[0].name == 'n6 n7'

        tlist = builder(env, target = ['n8 n9'], source = 'n10 n11')
        s = mystr(tlist)
        assert s == "['n8 n9']", s
        l = list(map(str, tlist))
        assert l == ['n8 n9'], l
        target = tlist[0]
        assert target.name == 'n8 n9'
        assert target.sources[0].name == 'n10 n11'

        # A test to be uncommented when we freeze the environment
        # as part of calling the builder.
        #env1 = Environment(VAR='foo')
        #target = builder(env1, target = 'n12', source = 'n13')
        #env1['VAR'] = 'bar'
        #be = target.get_build_env()
        #assert be['VAR'] == 'foo', be['VAR']

        n20 = MyNode_without_target_from_source('n20')
        flag = 0
        try:
            target = builder(env, None, source=n20)
        except SCons.Errors.UserError as e:
            flag = 1
        assert flag, "UserError should be thrown if a source node can't create a target."

        builder = SCons.Builder.Builder(action="foo",
                                        target_factory=MyNode,
                                        source_factory=MyNode,
                                        prefix='p-',
                                        suffix='.s')
        target = builder(env, None, source='n21')[0]
        assert target.name == 'p-n21.s', target

        builder = SCons.Builder.Builder(misspelled_action="foo",
                                        suffix = '.s')
        try:
            builder(env, target = 'n22', source = 'n22')
        except SCons.Errors.UserError as e:
            pass
        else:
            raise Exception("Did not catch expected UserError.")

        builder = SCons.Builder.Builder(action="foo")
        target = builder(env, None, source='n22', srcdir='src_dir')[0]
        p = target.sources[0].get_internal_path()
        assert p == os.path.join('src_dir', 'n22'), p

    def test_mistaken_variables(self):
        """Test keyword arguments that are often mistakes
        """
        import SCons.Warnings
        env = Environment()
        builder = SCons.Builder.Builder(action="foo")

        save_warn = SCons.Warnings.warn
        warned = []
        def my_warn(exception, warning, warned=warned):
            warned.append(warning)
        SCons.Warnings.warn = my_warn

        try:
            target = builder(env, 'mistaken1', sources='mistaken1.c')
            assert warned == ["Did you mean to use `source' instead of `sources'?"], warned
            del warned[:]

            target = builder(env, 'mistaken2', targets='mistaken2.c')
            assert warned == ["Did you mean to use `target' instead of `targets'?"], warned
            del warned[:]

            target = builder(env, 'mistaken3', targets='mistaken3', sources='mistaken3.c')
            assert "Did you mean to use `source' instead of `sources'?" in warned, warned
            assert "Did you mean to use `target' instead of `targets'?" in warned, warned
            del warned[:]
        finally:
            SCons.Warnings.warn = save_warn

    def test_action(self):
        """Test Builder creation

        Verify that we can retrieve the supplied action attribute.
        """
        builder = SCons.Builder.Builder(action="foo")
        assert builder.action.cmd_list == "foo"

        def func():
            pass
        builder = SCons.Builder.Builder(action=func)
        assert isinstance(builder.action, SCons.Action.FunctionAction)
        # Preserve the following so that the baseline test will fail.
        # Remove it in favor of the previous test at some convenient
        # point in the future.
        assert builder.action.execfunction == func

    def test_generator(self):
        """Test Builder creation given a generator function."""

        def generator():
            pass

        builder = SCons.Builder.Builder(generator=generator)
        assert builder.action.generator == generator

    def test_cmp(self):
        """Test simple comparisons of Builder objects
        """
        b1 = SCons.Builder.Builder(src_suffix = '.o')
        b2 = SCons.Builder.Builder(src_suffix = '.o')
        assert b1 == b2
        b3 = SCons.Builder.Builder(src_suffix = '.x')
        assert b1 != b3
        assert b2 != b3

    def test_target_factory(self):
        """Test a Builder that creates target nodes of a specified class
        """
        class Foo:
            pass
        def FooFactory(target):
            global Foo
            return Foo(target)
        builder = SCons.Builder.Builder(target_factory = FooFactory)
        assert builder.target_factory is FooFactory
        assert builder.source_factory is not FooFactory

    def test_source_factory(self):
        """Test a Builder that creates source nodes of a specified class
        """
        class Foo:
            pass
        def FooFactory(source):
            global Foo
            return Foo(source)
        builder = SCons.Builder.Builder(source_factory = FooFactory)
        assert builder.target_factory is not FooFactory
        assert builder.source_factory is FooFactory

    def test_splitext(self):
        """Test the splitext() method attached to a Builder."""
        b = SCons.Builder.Builder()
        assert b.splitext('foo') == ('foo','')
        assert b.splitext('foo.bar') == ('foo','.bar')
        assert b.splitext(os.path.join('foo.bar', 'blat')) == (os.path.join('foo.bar', 'blat'),'')

        class MyBuilder(SCons.Builder.BuilderBase):
            def splitext(self, path):
                return "called splitext()"

        b = MyBuilder()
        ret = b.splitext('xyz.c')
        assert ret == "called splitext()", ret

    def test_adjust_suffix(self):
        """Test how a Builder adjusts file suffixes
        """
        b = SCons.Builder.Builder()
        assert b.adjust_suffix('.foo') == '.foo'
        assert b.adjust_suffix('foo') == '.foo'
        assert b.adjust_suffix('$foo') == '$foo'

        class MyBuilder(SCons.Builder.BuilderBase):
            def adjust_suffix(self, suff):
                return "called adjust_suffix()"

        b = MyBuilder()
        ret = b.adjust_suffix('.foo')
        assert ret == "called adjust_suffix()", ret

    def test_prefix(self):
        """Test Builder creation with a specified target prefix

        Make sure that there is no '.' separator appended.
        """
        env = Environment()
        builder = SCons.Builder.Builder(prefix = 'lib.')
        assert builder.get_prefix(env) == 'lib.'
        builder = SCons.Builder.Builder(prefix = 'lib', action='')
        assert builder.get_prefix(env) == 'lib'
        tgt = builder(env, target = 'tgt1', source = 'src1')[0]
        assert tgt.get_internal_path() == 'libtgt1', \
                "Target has unexpected name: %s" % tgt.get_internal_path()
        tgt = builder(env, target = 'tgt2a tgt2b', source = 'src2')[0]
        assert tgt.get_internal_path() == 'libtgt2a tgt2b', \
                "Target has unexpected name: %s" % tgt.get_internal_path()
        tgt = builder(env, target = None, source = 'src3')[0]
        assert tgt.get_internal_path() == 'libsrc3', \
                "Target has unexpected name: %s" % tgt.get_internal_path()
        tgt = builder(env, target = None, source = 'lib/src4')[0]
        assert tgt.get_internal_path() == os.path.join('lib', 'libsrc4'), \
                "Target has unexpected name: %s" % tgt.get_internal_path()
        tgt = builder(env, target = 'lib/tgt5', source = 'lib/src5')[0]
        assert tgt.get_internal_path() == os.path.join('lib', 'libtgt5'), \
                "Target has unexpected name: %s" % tgt.get_internal_path()

        def gen_prefix(env, sources):
            return "gen_prefix() says " + env['FOO']
        my_env = Environment(FOO = 'xyzzy')
        builder = SCons.Builder.Builder(prefix = gen_prefix)
        assert builder.get_prefix(my_env) == "gen_prefix() says xyzzy"
        my_env['FOO'] = 'abracadabra'
        assert builder.get_prefix(my_env) == "gen_prefix() says abracadabra"

        def my_emit(env, sources):
            return env.subst('$EMIT')
        my_env = Environment(FOO = '.foo', EMIT = 'emit-')
        builder = SCons.Builder.Builder(prefix = {None   : 'default-',
                                                  '.in'  : 'out-',
                                                  '.x'   : 'y-',
                                                  '$FOO' : 'foo-',
                                                  '.zzz' : my_emit},
                                        action = '')
        tgt = builder(my_env, target = None, source = 'f1')[0]
        assert tgt.get_internal_path() == 'default-f1', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f2.c')[0]
        assert tgt.get_internal_path() == 'default-f2', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f3.in')[0]
        assert tgt.get_internal_path() == 'out-f3', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f4.x')[0]
        assert tgt.get_internal_path() == 'y-f4', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f5.foo')[0]
        assert tgt.get_internal_path() == 'foo-f5', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f6.zzz')[0]
        assert tgt.get_internal_path() == 'emit-f6', tgt.get_internal_path()

    def test_set_suffix(self):
        """Test the set_suffix() method"""
        b = SCons.Builder.Builder(action='')
        env = Environment(XSUFFIX = '.x')

        s = b.get_suffix(env)
        assert s == '', s

        b.set_suffix('.foo')
        s = b.get_suffix(env)
        assert s == '.foo', s

        b.set_suffix('$XSUFFIX')
        s = b.get_suffix(env)
        assert s == '.x', s

    def test_src_suffix(self):
        """Test Builder creation with a specified source file suffix

        Make sure that the '.' separator is appended to the
        beginning if it isn't already present.
        """
        env = Environment(XSUFFIX = '.x', YSUFFIX = '.y')

        b1 = SCons.Builder.Builder(src_suffix = '.c', action='')
        assert b1.src_suffixes(env) == ['.c'], b1.src_suffixes(env)

        tgt = b1(env, target = 'tgt2', source = 'src2')[0]
        assert tgt.sources[0].get_internal_path() == 'src2.c', \
                "Source has unexpected name: %s" % tgt.sources[0].get_internal_path()

        tgt = b1(env, target = 'tgt3', source = 'src3a src3b')[0]
        assert len(tgt.sources) == 1
        assert tgt.sources[0].get_internal_path() == 'src3a src3b.c', \
                "Unexpected tgt.sources[0] name: %s" % tgt.sources[0].get_internal_path()

        b2 = SCons.Builder.Builder(src_suffix = '.2', src_builder = b1)
        r = sorted(b2.src_suffixes(env))
        assert r == ['.2', '.c'], r

        b3 = SCons.Builder.Builder(action = {'.3a' : '', '.3b' : ''})
        s = sorted(b3.src_suffixes(env))
        assert s == ['.3a', '.3b'], s

        b4 = SCons.Builder.Builder(src_suffix = '$XSUFFIX')
        assert b4.src_suffixes(env) == ['.x'], b4.src_suffixes(env)

        b5 = SCons.Builder.Builder(action = { '.y' : ''})
        assert b5.src_suffixes(env) == ['.y'], b5.src_suffixes(env)

    def test_srcsuffix_nonext(self):
        """Test target generation from non-extension source suffixes"""
        env = Environment()
        b6 = SCons.Builder.Builder(action = '',
                                   src_suffix='_src.a',
                                   suffix='.b')
        tgt = b6(env, target=None, source='foo_src.a')
        assert str(tgt[0]) == 'foo.b', str(tgt[0])

        b7 = SCons.Builder.Builder(action = '',
                                   src_suffix='_source.a',
                                   suffix='_obj.b')
        b8 = SCons.Builder.Builder(action = '',
                                   src_builder=b7,
                                   suffix='.c')
        tgt = b8(env, target=None, source='foo_source.a')
        assert str(tgt[0]) == 'foo_obj.c', str(tgt[0])
        src = env.fs.File('foo_source.a')
        tgt = b8(env, target=None, source=src)
        assert str(tgt[0]) == 'foo_obj.c', str(tgt[0])

        b9 = SCons.Builder.Builder(action={'_src.a' : 'srcaction'},
                                   suffix='.c')
        b9.add_action('_altsrc.b', 'altaction')
        tgt = b9(env, target=None, source='foo_altsrc.b')
        assert str(tgt[0]) == 'foo.c', str(tgt[0])

    def test_src_suffix_expansion(self):
        """Test handling source suffixes when an expansion is involved"""
        env = Environment(OBJSUFFIX = '.obj')

        b1 = SCons.Builder.Builder(action = '',
                                   src_suffix='.c',
                                   suffix='.obj')
        b2 = SCons.Builder.Builder(action = '',
                                   src_builder=b1,
                                   src_suffix='.obj',
                                   suffix='.exe')
        tgt = b2(env, target=None, source=['foo$OBJSUFFIX'])
        s = list(map(str, tgt[0].sources))
        assert s == ['foo.obj'], s

    def test_suffix(self):
        """Test Builder creation with a specified target suffix

        Make sure that the '.' separator is appended to the
        beginning if it isn't already present.
        """
        env = Environment()
        builder = SCons.Builder.Builder(suffix = '.o')
        assert builder.get_suffix(env) == '.o', builder.get_suffix(env)
        builder = SCons.Builder.Builder(suffix = 'o', action='')
        assert builder.get_suffix(env) == '.o', builder.get_suffix(env)
        tgt = builder(env, target = 'tgt3', source = 'src3')[0]
        assert tgt.get_internal_path() == 'tgt3.o', \
                "Target has unexpected name: %s" % tgt.get_internal_path()
        tgt = builder(env, target = 'tgt4a tgt4b', source = 'src4')[0]
        assert tgt.get_internal_path() == 'tgt4a tgt4b.o', \
                "Target has unexpected name: %s" % tgt.get_internal_path()
        tgt = builder(env, target = None, source = 'src5')[0]
        assert tgt.get_internal_path() == 'src5.o', \
                "Target has unexpected name: %s" % tgt.get_internal_path()

        def gen_suffix(env, sources):
            return "gen_suffix() says " + env['BAR']
        my_env = Environment(BAR = 'hocus pocus')
        builder = SCons.Builder.Builder(suffix = gen_suffix)
        assert builder.get_suffix(my_env) == "gen_suffix() says hocus pocus", builder.get_suffix(my_env)
        my_env['BAR'] = 'presto chango'
        assert builder.get_suffix(my_env) == "gen_suffix() says presto chango"

        def my_emit(env, sources):
            return env.subst('$EMIT')
        my_env = Environment(BAR = '.bar', EMIT = '.emit')
        builder = SCons.Builder.Builder(suffix = {None   : '.default',
                                                  '.in'  : '.out',
                                                  '.x'   : '.y',
                                                  '$BAR' : '.new',
                                                  '.zzz' : my_emit},
                                        action='')
        tgt = builder(my_env, target = None, source = 'f1')[0]
        assert tgt.get_internal_path() == 'f1.default', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f2.c')[0]
        assert tgt.get_internal_path() == 'f2.default', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f3.in')[0]
        assert tgt.get_internal_path() == 'f3.out', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f4.x')[0]
        assert tgt.get_internal_path() == 'f4.y', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f5.bar')[0]
        assert tgt.get_internal_path() == 'f5.new', tgt.get_internal_path()
        tgt = builder(my_env, target = None, source = 'f6.zzz')[0]
        assert tgt.get_internal_path() == 'f6.emit', tgt.get_internal_path()

    def test_single_source(self):
        """Test Builder with single_source flag set"""
        def func(target, source, env):
            """create the file"""
            with open(str(target[0]), "w"):
                pass
            if len(source) == 1 and len(target) == 1:
                env['CNT'][0] = env['CNT'][0] + 1

        env = Environment()
        infiles = []
        outfiles = []
        for i in range(10):
            infiles.append(test.workpath('%d.in' % i))
            outfiles.append(test.workpath('%d.out' % i))
            test.write(infiles[-1], "\n")
        builder = SCons.Builder.Builder(action=SCons.Action.Action(func,None),
                                        single_source = 1, suffix='.out')
        env['CNT'] = [0]
        tgt = builder(env, target=outfiles[0], source=infiles[0])[0]
        s = str(tgt)
        t = os.path.normcase(test.workpath('0.out'))
        assert os.path.normcase(s) == t, s
        tgt.prepare()
        tgt.build()
        assert env['CNT'][0] == 1, env['CNT'][0]
        tgt = builder(env, outfiles[1], infiles[1])[0]
        s = str(tgt)
        t = os.path.normcase(test.workpath('1.out'))
        assert os.path.normcase(s) == t, s
        tgt.prepare()
        tgt.build()
        assert env['CNT'][0] == 2
        tgts = builder(env, None, infiles[2:4])
        s = list(map(str, tgts))
        expect = [test.workpath('2.out'), test.workpath('3.out')]
        expect = list(map(os.path.normcase, expect))
        assert list(map(os.path.normcase, s)) == expect, s
        for t in tgts: t.prepare()
        tgts[0].build()
        tgts[1].build()
        assert env['CNT'][0] == 4
        try:
            tgt = builder(env, outfiles[4], infiles[4:6])
        except SCons.Errors.UserError:
            pass
        else:
            assert 0
        try:
            # The builder may output more than one target per input file.
            tgt = builder(env, outfiles[4:6], infiles[4:6])
        except SCons.Errors.UserError:
            pass
        else:
            assert 0


    def test_lists(self):
        """Testing handling lists of targets and source"""
        def function2(target, source, env, tlist = [outfile, outfile2], **kw):
            for t in target:
                with open(str(t), 'w') as f:
                    f.write("function2\n")
            for t in tlist:
                if t not in list(map(str, target)):
                    with open(t, 'w') as f:
                        f.write("function2\n")
            return 1

        env = Environment()
        builder = SCons.Builder.Builder(action = function2)

        tgts = builder(env, source=[])
        assert tgts == [], tgts

        tgts = builder(env, target = [outfile, outfile2], source = infile)
        for t in tgts:
            t.prepare()
        try:
            tgts[0].build()
        except SCons.Errors.BuildError:
            pass
        c = test.read(outfile, 'r')
        assert c == "function2\n", c
        c = test.read(outfile2, 'r')
        assert c == "function2\n", c

        sub1_out = test.workpath('sub1', 'out')
        sub2_out = test.workpath('sub2', 'out')

        def function3(target, source, env, tlist = [sub1_out, sub2_out]):
            for t in target:
                with open(str(t), 'w') as f:
                    f.write("function3\n")
            for t in tlist:
                if t not in list(map(str, target)):
                    with open(t, 'w') as f:
                        f.write("function3\n")
            return 1

        builder = SCons.Builder.Builder(action = function3)
        tgts = builder(env, target = [sub1_out, sub2_out], source = infile)
        for t in tgts:
            t.prepare()
        try:
            tgts[0].build()
        except SCons.Errors.BuildError:
            pass
        c = test.read(sub1_out, 'r')
        assert c == "function3\n", c
        c = test.read(sub2_out, 'r')
        assert c == "function3\n", c
        assert os.path.exists(test.workpath('sub1'))
        assert os.path.exists(test.workpath('sub2'))

    def test_src_builder(self):
        """Testing Builders with src_builder"""
        # These used to be MultiStepBuilder objects until we
        # eliminated it as a separate class
        env = Environment()
        builder1 = SCons.Builder.Builder(action='foo',
                                         src_suffix='.bar',
                                         suffix='.foo')
        builder2 = SCons.Builder.Builder(action=MyAction('act'),
                                         src_builder = builder1,
                                         src_suffix = '.foo')

        tgt = builder2(env, source=[])
        assert tgt == [], tgt

        sources = ['test.bar', 'test2.foo', 'test3.txt', 'test4']
        tgt = builder2(env, target='baz', source=sources)[0]
        s = str(tgt)
        assert s == 'baz', s
        s = list(map(str, tgt.sources))
        assert s == ['test.foo', 'test2.foo', 'test3.txt', 'test4.foo'], s
        s = list(map(str, tgt.sources[0].sources))
        assert s == ['test.bar'], s

        tgt = builder2(env, None, 'aaa.bar')[0]
        s = str(tgt)
        assert s == 'aaa', s
        s = list(map(str, tgt.sources))
        assert s == ['aaa.foo'], s
        s = list(map(str, tgt.sources[0].sources))
        assert s == ['aaa.bar'], s

        builder3 = SCons.Builder.Builder(action='bld3')
        assert builder3.src_builder is not builder1.src_builder

        builder4 = SCons.Builder.Builder(action='bld4',
                                         src_suffix='.i',
                                         suffix='_wrap.c')
        builder5 = SCons.Builder.Builder(action=MyAction('act'),
                                         src_builder=builder4,
                                         suffix='.obj',
                                         src_suffix='.c')
        builder6 = SCons.Builder.Builder(action=MyAction('act'),
                                         src_builder=builder5,
                                         suffix='.exe',
                                         src_suffix='.obj')
        tgt = builder6(env, 'test', 'test.i')[0]
        s = str(tgt)
        assert s == 'test.exe', s
        s = list(map(str, tgt.sources))
        assert s == ['test_wrap.obj'], s
        s = list(map(str, tgt.sources[0].sources))
        assert s == ['test_wrap.c'], s
        s = list(map(str, tgt.sources[0].sources[0].sources))
        assert s == ['test.i'], s

    def test_target_scanner(self):
        """Testing ability to set target and source scanners through a builder."""
        global instanced
        class TestScanner:
            pass
        tscan = TestScanner()
        sscan = TestScanner()
        env = Environment()
        builder = SCons.Builder.Builder(target_scanner=tscan,
                                        source_scanner=sscan,
                                        action='')
        tgt = builder(env, target='foo2', source='bar')[0]
        assert tgt.builder.target_scanner == tscan, tgt.builder.target_scanner
        assert tgt.builder.source_scanner == sscan, tgt.builder.source_scanner

        builder1 = SCons.Builder.Builder(action='foo',
                                         src_suffix='.bar',
                                         suffix='.foo')
        builder2 = SCons.Builder.Builder(action='foo',
                                         src_builder = builder1,
                                         target_scanner = tscan,
                                         source_scanner = tscan)
        tgt = builder2(env, target='baz2', source='test.bar test2.foo test3.txt')[0]
        assert tgt.builder.target_scanner == tscan, tgt.builder.target_scanner
        assert tgt.builder.source_scanner == tscan, tgt.builder.source_scanner

    def test_actual_scanner(self):
        """Test usage of actual Scanner objects."""

        import SCons.Scanner

        def func(self):
            pass

        scanner = SCons.Scanner.ScannerBase(func, name='fooscan')

        b1 = SCons.Builder.Builder(action='bld', target_scanner=scanner)
        b2 = SCons.Builder.Builder(action='bld', target_scanner=scanner)
        b3 = SCons.Builder.Builder(action='bld')

        assert b1 == b2
        assert b1 != b3

    def test_src_scanner(self):
        """Testing ability to set a source file scanner through a builder."""
        class TestScanner:
            def key(self, env):
                 return 'TestScannerkey'
            def instance(self, env):
                 return self
            def select(self, node):
                 return self
            name = 'TestScanner'
            def __str__(self):
                return self.name

        scanner = TestScanner()
        builder = SCons.Builder.Builder(action='action')

        # With no scanner specified, source_scanner and
        # backup_source_scanner are None.
        bar_y = MyNode('bar.y')
        env1 = Environment()
        tgt = builder(env1, target='foo1.x', source='bar.y')[0]
        src = tgt.sources[0]
        assert tgt.builder.target_scanner != scanner, tgt.builder.target_scanner
        assert tgt.builder.source_scanner is None, tgt.builder.source_scanner
        assert tgt.get_source_scanner(bar_y) is None, tgt.get_source_scanner(bar_y)
        assert not src.has_builder(), src.has_builder()
        s = src.get_source_scanner(bar_y)
        assert isinstance(s, SCons.Util.Null), repr(s)

        # An Environment that has suffix-specified SCANNERS should
        # provide a source scanner to the target.
        class EnvTestScanner:
            def key(self, env):
                 return '.y'
            def instance(self, env):
                 return self
            name = 'EnvTestScanner'
            def __str__(self):
                return self.name
            def select(self, node):
                return self
            def path(self, env, dir=None):
                return ()
            def __call__(self, node, env, path):
                return []
        env3 = Environment(SCANNERS = [EnvTestScanner()])
        env3.scanner = EnvTestScanner() # test env's version of SCANNERS
        tgt = builder(env3, target='foo2.x', source='bar.y')[0]
        src = tgt.sources[0]
        assert tgt.builder.target_scanner != scanner, tgt.builder.target_scanner
        assert not tgt.builder.source_scanner, tgt.builder.source_scanner
        assert tgt.get_source_scanner(bar_y), tgt.get_source_scanner(bar_y)
        assert str(tgt.get_source_scanner(bar_y)) == 'EnvTestScanner', tgt.get_source_scanner(bar_y)
        assert not src.has_builder(), src.has_builder()
        s = src.get_source_scanner(bar_y)
        assert isinstance(s, SCons.Util.Null), repr(s)

        # Can't simply specify the scanner as a builder argument; it's
        # global to all invocations of this builder.
        tgt = builder(env3, target='foo3.x', source='bar.y', source_scanner = scanner)[0]
        src = tgt.sources[0]
        assert tgt.builder.target_scanner != scanner, tgt.builder.target_scanner
        assert not tgt.builder.source_scanner, tgt.builder.source_scanner
        assert tgt.get_source_scanner(bar_y), tgt.get_source_scanner(bar_y)
        assert str(tgt.get_source_scanner(bar_y)) == 'EnvTestScanner', tgt.get_source_scanner(bar_y)
        assert not src.has_builder(), src.has_builder()
        s = src.get_source_scanner(bar_y)
        assert isinstance(s, SCons.Util.Null), s

        # Now use a builder that actually has scanners and ensure that
        # the target is set accordingly (using the specified scanner
        # instead of the Environment's scanner)
        builder = SCons.Builder.Builder(action='action',
                                        source_scanner=scanner,
                                        target_scanner=scanner)
        tgt = builder(env3, target='foo4.x', source='bar.y')[0]
        src = tgt.sources[0]
        assert tgt.builder.target_scanner == scanner, tgt.builder.target_scanner
        assert tgt.builder.source_scanner, tgt.builder.source_scanner
        assert tgt.builder.source_scanner == scanner, tgt.builder.source_scanner
        assert str(tgt.builder.source_scanner) == 'TestScanner', str(tgt.builder.source_scanner)
        assert tgt.get_source_scanner(bar_y), tgt.get_source_scanner(bar_y)
        assert tgt.get_source_scanner(bar_y) == scanner, tgt.get_source_scanner(bar_y)
        assert str(tgt.get_source_scanner(bar_y)) == 'TestScanner', tgt.get_source_scanner(bar_y)
        assert not src.has_builder(), src.has_builder()
        s = src.get_source_scanner(bar_y)
        assert isinstance(s, SCons.Util.Null), s



    def test_Builder_API(self):
        """Test Builder interface.

        Some of this is tested elsewhere in this file, but this is a
        quick collection of common operations on builders with various
        forms of component specifications."""

        builder = SCons.Builder.Builder()
        env = Environment(BUILDERS={'Bld':builder})

        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == '', r
        r = builder.get_suffix(env)
        assert r == '', r
        r = builder.get_src_suffix(env)
        assert r == '', r
        r = builder.src_suffixes(env)
        assert r == [], r

        # src_suffix can be a single string or a list of strings
        # src_suffixes() caches its return value, so we use a new
        # Builder each time we do any of these tests

        bld = SCons.Builder.Builder()
        env = Environment(BUILDERS={'Bld':bld})

        bld.set_src_suffix('.foo')
        r = bld.get_src_suffix(env)
        assert r == '.foo', r
        r = bld.src_suffixes(env)
        assert r == ['.foo'], r

        bld = SCons.Builder.Builder()
        env = Environment(BUILDERS={'Bld':bld})

        bld.set_src_suffix(['.foo', '.bar'])
        r = bld.get_src_suffix(env)
        assert r == '.foo', r
        r = bld.src_suffixes(env)
        assert r == ['.foo', '.bar'], r

        bld = SCons.Builder.Builder()
        env = Environment(BUILDERS={'Bld':bld})

        bld.set_src_suffix(['.bar', '.foo'])
        r = bld.get_src_suffix(env)
        assert r == '.bar', r
        r = sorted(bld.src_suffixes(env))
        assert r == ['.bar', '.foo'], r

        # adjust_suffix normalizes the suffix, adding a `.' if needed

        r = builder.adjust_suffix('.foo')
        assert r == '.foo', r
        r = builder.adjust_suffix('_foo')
        assert r == '_foo', r
        r = builder.adjust_suffix('$foo')
        assert r == '$foo', r
        r = builder.adjust_suffix('foo')
        assert r == '.foo', r
        r = builder.adjust_suffix('f._$oo')
        assert r == '.f._$oo', r

        # prefix and suffix can be one of:
        #   1. a string (adjusted and env variables substituted),
        #   2. a function (passed (env,sources), returns suffix string)
        #   3. a dict of src_suffix:suffix settings, key==None is
        #      default suffix (special case of #2, so adjust_suffix
        #      not applied)

        builder = SCons.Builder.Builder(prefix='lib', suffix='foo')

        env = Environment(BUILDERS={'Bld':builder})
        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'lib', r
        r = builder.get_suffix(env)
        assert r == '.foo', r

        mkpref = lambda env,sources: 'Lib'
        mksuff = lambda env,sources: '.Foo'
        builder = SCons.Builder.Builder(prefix=mkpref, suffix=mksuff)

        env = Environment(BUILDERS={'Bld':builder})
        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'Lib', r
        r = builder.get_suffix(env)
        assert r == '.Foo', r

        builder = SCons.Builder.Builder(prefix='$PREF', suffix='$SUFF')

        env = Environment(BUILDERS={'Bld':builder},PREF="LIB",SUFF=".FOO")
        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'LIB', r
        r = builder.get_suffix(env)
        assert r == '.FOO', r

        builder = SCons.Builder.Builder(prefix={None:'A_',
                                                '.C':'E_'},
                                        suffix={None:'.B',
                                                '.C':'.D'})

        env = Environment(BUILDERS={'Bld':builder})
        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'A_', r
        r = builder.get_suffix(env)
        assert r == '.B', r
        r = builder.get_prefix(env, [MyNode('X.C')])
        assert r == 'E_', r
        r = builder.get_suffix(env, [MyNode('X.C')])
        assert r == '.D', r

        builder = SCons.Builder.Builder(prefix='A_', suffix={}, action={})
        env = Environment(BUILDERS={'Bld':builder})

        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'A_', r
        r = builder.get_suffix(env)
        assert r is None, r
        r = builder.get_src_suffix(env)
        assert r == '', r
        r = builder.src_suffixes(env)
        assert r == [], r

        # Builder actions can be a string, a list, or a dictionary
        # whose keys are the source suffix.  The add_action()
        # specifies a new source suffix/action binding.

        builder = SCons.Builder.Builder(prefix='A_', suffix={}, action={})
        env = Environment(BUILDERS={'Bld':builder})
        builder.add_action('.src_sfx1', 'FOO')

        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'A_', r
        r = builder.get_suffix(env)
        assert r is None, r
        r = builder.get_suffix(env, [MyNode('X.src_sfx1')])
        assert r is None, r
        r = builder.get_src_suffix(env)
        assert r == '.src_sfx1', r
        r = builder.src_suffixes(env)
        assert r == ['.src_sfx1'], r

        builder = SCons.Builder.Builder(prefix='A_', suffix={}, action={})
        env = Environment(BUILDERS={'Bld':builder})
        builder.add_action('.src_sfx1', 'FOO')
        builder.add_action('.src_sfx2', 'BAR')

        r = builder.get_name(env)
        assert r == 'Bld', r
        r = builder.get_prefix(env)
        assert r == 'A_', r
        r = builder.get_suffix(env)
        assert r is None, r
        r = builder.get_src_suffix(env)
        assert r == '.src_sfx1', r
        r = sorted(builder.src_suffixes(env))
        assert r == ['.src_sfx1', '.src_sfx2'], r


    def test_Builder_Args(self):
        """Testing passing extra args to a builder."""
        def buildFunc(target, source, env, s=self):
            s.foo=env['foo']
            s.bar=env['bar']
            assert env['CC'] == 'mycc'

        env=Environment(CC='cc')

        builder = SCons.Builder.Builder(action=buildFunc)
        tgt = builder(env, target='foo', source='bar', foo=1, bar=2, CC='mycc')[0]
        tgt.build()
        assert self.foo == 1, self.foo
        assert self.bar == 2, self.bar

    def test_emitter(self):
        """Test emitter functions."""
        def emit(target, source, env):
            foo = env.get('foo', 0)
            bar = env.get('bar', 0)
            for t in target:
                assert isinstance(t, MyNode)
                assert t.has_builder()
            for s in source:
                assert isinstance(s, MyNode)
            if foo:
                target.append("bar%d"%foo)
            if bar:
                source.append("baz")
            return ( target, source )

        env = Environment()
        builder = SCons.Builder.Builder(action='foo',
                                        emitter=emit,
                                        target_factory=MyNode,
                                        source_factory=MyNode)
        tgt = builder(env, target='foo2', source='bar')[0]
        assert str(tgt) == 'foo2', str(tgt)
        assert str(tgt.sources[0]) == 'bar', str(tgt.sources[0])

        tgt = builder(env, target='foo3', source='bar', foo=1)
        assert len(tgt) == 2, len(tgt)
        assert 'foo3' in list(map(str, tgt)), list(map(str, tgt))
        assert 'bar1' in list(map(str, tgt)), list(map(str, tgt))

        tgt = builder(env, target='foo4', source='bar', bar=1)[0]
        assert str(tgt) == 'foo4', str(tgt)
        assert len(tgt.sources) == 2, len(tgt.sources)
        assert 'baz' in list(map(str, tgt.sources)), list(map(str, tgt.sources))
        assert 'bar' in list(map(str, tgt.sources)), list(map(str, tgt.sources))

        env2=Environment(FOO=emit)
        builder2=SCons.Builder.Builder(action='foo',
                                       emitter="$FOO",
                                       target_factory=MyNode,
                                       source_factory=MyNode)

        builder2a=SCons.Builder.Builder(action='foo',
                                        emitter="$FOO",
                                        target_factory=MyNode,
                                        source_factory=MyNode)

        assert builder2 == builder2a, repr(builder2.__dict__) + "\n" + repr(builder2a.__dict__)

        tgt = builder2(env2, target='foo5', source='bar')[0]
        assert str(tgt) == 'foo5', str(tgt)
        assert str(tgt.sources[0]) == 'bar', str(tgt.sources[0])

        tgt = builder2(env2, target='foo6', source='bar', foo=2)
        assert len(tgt) == 2, len(tgt)
        assert 'foo6' in list(map(str, tgt)), list(map(str, tgt))
        assert 'bar2' in list(map(str, tgt)), list(map(str, tgt))

        tgt = builder2(env2, target='foo7', source='bar', bar=1)[0]
        assert str(tgt) == 'foo7', str(tgt)
        assert len(tgt.sources) == 2, len(tgt.sources)
        assert 'baz' in list(map(str, tgt.sources)), list(map(str, tgt.sources))
        assert 'bar' in list(map(str, tgt.sources)), list(map(str, tgt.sources))

    def test_emitter_preserve_builder(self):
        """Test an emitter not overwriting a newly-set builder"""
        env = Environment()

        new_builder = SCons.Builder.Builder(action='new')
        node = MyNode('foo8')
        new_node = MyNode('foo8.new')

        def emit(target, source, env, nb=new_builder, nn=new_node):
            for t in target:
                t.builder = nb
            return [nn], source

        builder=SCons.Builder.Builder(action='foo',
                                      emitter=emit,
                                      target_factory=MyNode,
                                      source_factory=MyNode)
        tgt = builder(env, target=node, source='bar')[0]
        assert tgt is new_node, tgt
        assert tgt.builder is builder, tgt.builder
        assert node.builder is new_builder, node.builder

    def test_emitter_suffix_map(self):
        """Test mapping file suffixes to emitter functions"""
        env = Environment()

        def emit4a(target, source, env):
            source = list(map(str, source))
            target = ['emit4a-' + x[:-3] for x in source]
            return (target, source)
        def emit4b(target, source, env):
            source = list(map(str, source))
            target = ['emit4b-' + x[:-3] for x in source]
            return (target, source)

        builder = SCons.Builder.Builder(action='foo',
                                        emitter={'.4a':emit4a,
                                                 '.4b':emit4b},
                                        target_factory=MyNode,
                                        source_factory=MyNode)
        tgt = builder(env, None, source='aaa.4a')[0]
        assert str(tgt) == 'emit4a-aaa', str(tgt)
        tgt = builder(env, None, source='bbb.4b')[0]
        assert str(tgt) == 'emit4b-bbb', str(tgt)
        tgt = builder(env, None, source='ccc.4c')[0]
        assert str(tgt) == 'ccc', str(tgt)

        def emit4c(target, source, env):
            source = list(map(str, source))
            target = ['emit4c-' + x[:-3] for x in source]
            return (target, source)

        builder.add_emitter('.4c', emit4c)
        tgt = builder(env, None, source='ccc.4c')[0]
        assert str(tgt) == 'emit4c-ccc', str(tgt)

    def test_emitter_function_list(self):
        """Test lists of emitter functions"""
        env = Environment()

        def emit1a(target, source, env):
            source = list(map(str, source))
            target = target + ['emit1a-' + x[:-2] for x in source]
            return (target, source)
        def emit1b(target, source, env):
            source = list(map(str, source))
            target = target + ['emit1b-' + x[:-2] for x in source]
            return (target, source)
        builder1 = SCons.Builder.Builder(action='foo',
                                         emitter=[emit1a, emit1b],
                                         node_factory=MyNode)

        tgts = builder1(env, target='target-1', source='aaa.1')
        tgts = list(map(str, tgts))
        assert tgts == ['target-1', 'emit1a-aaa', 'emit1b-aaa'], tgts

        # Test a list of emitter functions through the environment.
        def emit2a(target, source, env):
            source = list(map(str, source))
            target = target + ['emit2a-' + x[:-2] for x in source]
            return (target, source)
        def emit2b(target, source, env):
            source = list(map(str, source))
            target = target + ['emit2b-' + x[:-2] for x in source]
            return (target, source)
        builder2 = SCons.Builder.Builder(action='foo',
                                         emitter='$EMITTERLIST',
                                         node_factory=MyNode)

        env = Environment(EMITTERLIST = [emit2a, emit2b])

        tgts = builder2(env, target='target-2', source='aaa.2')
        tgts = list(map(str, tgts))
        assert tgts == ['target-2', 'emit2a-aaa', 'emit2b-aaa'], tgts

    def test_emitter_TARGET_SOURCE(self):
        """Test use of $TARGET and $SOURCE in emitter results"""

        env = SCons.Environment.Environment()

        def emit(target, source, env):
            return (target + ['${SOURCE}.s1', '${TARGET}.t1'],
                    source + ['${TARGET}.t2', '${SOURCE}.s2'])

        builder = SCons.Builder.Builder(action='foo',
                                        emitter = emit,
                                        node_factory = MyNode)

        targets = builder(env, target = 'TTT', source ='SSS')
        sources = targets[0].sources
        targets = list(map(str, targets))
        sources = list(map(str, sources))
        assert targets == ['TTT', 'SSS.s1', 'TTT.t1'], targets
        assert sources == ['SSS', 'TTT.t2', 'SSS.s2'], targets

    def test_no_target(self):
        """Test deducing the target from the source."""

        env = Environment()
        b = SCons.Builder.Builder(action='foo', suffix='.o')

        tgt = b(env, None, 'aaa')[0]
        assert str(tgt) == 'aaa.o', str(tgt)
        assert len(tgt.sources) == 1, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'aaa', list(map(str, tgt.sources))

        tgt = b(env, None, 'bbb.c')[0]
        assert str(tgt) == 'bbb.o', str(tgt)
        assert len(tgt.sources) == 1, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'bbb.c', list(map(str, tgt.sources))

        tgt = b(env, None, 'ccc.x.c')[0]
        assert str(tgt) == 'ccc.x.o', str(tgt)
        assert len(tgt.sources) == 1, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'ccc.x.c', list(map(str, tgt.sources))

        tgt = b(env, None, ['d0.c', 'd1.c'])[0]
        assert str(tgt) == 'd0.o', str(tgt)
        assert len(tgt.sources) == 2,  list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'd0.c', list(map(str, tgt.sources))
        assert str(tgt.sources[1]) == 'd1.c', list(map(str, tgt.sources))

        tgt = b(env, target = None, source='eee')[0]
        assert str(tgt) == 'eee.o', str(tgt)
        assert len(tgt.sources) == 1, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'eee', list(map(str, tgt.sources))

        tgt = b(env, target = None, source='fff.c')[0]
        assert str(tgt) == 'fff.o', str(tgt)
        assert len(tgt.sources) == 1, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'fff.c', list(map(str, tgt.sources))

        tgt = b(env, target = None, source='ggg.x.c')[0]
        assert str(tgt) == 'ggg.x.o', str(tgt)
        assert len(tgt.sources) == 1, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'ggg.x.c', list(map(str, tgt.sources))

        tgt = b(env, target = None, source=['h0.c', 'h1.c'])[0]
        assert str(tgt) == 'h0.o', str(tgt)
        assert len(tgt.sources) == 2,  list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'h0.c', list(map(str, tgt.sources))
        assert str(tgt.sources[1]) == 'h1.c', list(map(str, tgt.sources))

        w = b(env, target='i0.w', source=['i0.x'])[0]
        y = b(env, target='i1.y', source=['i1.z'])[0]
        tgt = b(env, None, source=[w, y])[0]
        assert str(tgt) == 'i0.o', str(tgt)
        assert len(tgt.sources) == 2, list(map(str, tgt.sources))
        assert str(tgt.sources[0]) == 'i0.w', list(map(str, tgt.sources))
        assert str(tgt.sources[1]) == 'i1.y', list(map(str, tgt.sources))

    def test_get_name(self):
        """Test getting name of builder.

        Each type of builder should return its environment-specific
        name when queried appropriately.  """

        b1 = SCons.Builder.Builder(action='foo', suffix='.o')
        b2 = SCons.Builder.Builder(action='foo', suffix='.c')
        b3 = SCons.Builder.Builder(action='bar', src_suffix = '.foo',
                                                 src_builder = b1)
        b4 = SCons.Builder.Builder(action={})
        b5 = SCons.Builder.Builder(action='foo', name='builder5')
        b6 = SCons.Builder.Builder(action='foo')
        assert isinstance(b4, SCons.Builder.CompositeBuilder)
        assert isinstance(b4.action, SCons.Action.CommandGeneratorAction)

        env = Environment(BUILDERS={'bldr1': b1,
                                    'bldr2': b2,
                                    'bldr3': b3,
                                    'bldr4': b4})
        env2 = Environment(BUILDERS={'B1': b1,
                                     'B2': b2,
                                     'B3': b3,
                                     'B4': b4})
        # With no name, get_name will return the class.  Allow
        # for caching...
        b6_names = [
            'SCons.Builder.BuilderBase',
            "<class 'SCons.Builder.BuilderBase'>",
            'SCons.Memoize.BuilderBase',
            "<class 'SCons.Memoize.BuilderBase'>",
        ]

        assert b1.get_name(env) == 'bldr1', b1.get_name(env)
        assert b2.get_name(env) == 'bldr2', b2.get_name(env)
        assert b3.get_name(env) == 'bldr3', b3.get_name(env)
        assert b4.get_name(env) == 'bldr4', b4.get_name(env)
        assert b5.get_name(env) == 'builder5', b5.get_name(env)
        assert b6.get_name(env) in b6_names, b6.get_name(env)

        assert b1.get_name(env2) == 'B1', b1.get_name(env2)
        assert b2.get_name(env2) == 'B2', b2.get_name(env2)
        assert b3.get_name(env2) == 'B3', b3.get_name(env2)
        assert b4.get_name(env2) == 'B4', b4.get_name(env2)
        assert b5.get_name(env2) == 'builder5', b5.get_name(env2)
        assert b6.get_name(env2) in b6_names, b6.get_name(env2)

        assert b5.get_name(None) == 'builder5', b5.get_name(None)
        assert b6.get_name(None) in b6_names, b6.get_name(None)

        # This test worked before adding batch builders, but we must now
        # be able to disambiguate a CompositeAction into a more specific
        # action based on file suffix at call time.  Leave this commented
        # out (for now) in case this reflects a real-world use case that
        # we must accomodate and we want to resurrect this test.
        #tgt = b4(env, target = 'moo', source='cow')
        #assert tgt[0].builder.get_name(env) == 'bldr4'

class CompositeBuilderTestCase(unittest.TestCase):

    def setUp(self):
        def func_action(target, source, env):
            return 0

        builder = SCons.Builder.Builder(action={ '.foo' : func_action,
                                                 '.bar' : func_action})

        self.func_action = func_action
        self.builder = builder

    def test___init__(self):
        """Test CompositeBuilder creation"""
        env = Environment()
        builder = SCons.Builder.Builder(action={})

        tgt = builder(env, source=[])
        assert tgt == [], tgt

        assert isinstance(builder, SCons.Builder.CompositeBuilder)
        assert isinstance(builder.action, SCons.Action.CommandGeneratorAction)

    def test_target_action(self):
        """Test CompositeBuilder setting of target builder actions"""
        env = Environment()
        builder = self.builder

        tgt = builder(env, target='test1', source='test1.foo')[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase)
        assert tgt.builder.action is builder.action

        tgt = builder(env, target='test2', source='test1.bar')[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase)
        assert tgt.builder.action is builder.action

    def test_multiple_suffix_error(self):
        """Test the CompositeBuilder multiple-source-suffix error"""
        env = Environment()
        builder = self.builder

        flag = 0
        try:
            builder(env, target='test3', source=['test2.bar', 'test1.foo'])[0]
        except SCons.Errors.UserError as e:
            flag = 1
            err = e
        assert flag, "UserError should be thrown when we call a builder with files of different suffixes."
        expect = "While building `['test3']' from `test1.foo': Cannot build multiple sources with different extensions: .bar, .foo"
        assert str(err) == expect, err

    def test_source_ext_match(self):
        """Test the CompositeBuilder source_ext_match argument"""
        env = Environment()
        func_action = self.func_action
        builder = SCons.Builder.Builder(action={ '.foo' : func_action,
                                                 '.bar' : func_action},
                                        source_ext_match = None)

        tgt = builder(env, target='test3', source=['test2.bar', 'test1.foo'])[0]
        tgt.build()

    def test_suffix_variable(self):
        """Test CompositeBuilder defining action suffixes through a variable"""
        env = Environment(BAR_SUFFIX = '.BAR2', FOO_SUFFIX = '.FOO2')
        func_action = self.func_action
        builder = SCons.Builder.Builder(action={ '.foo' : func_action,
                                                 '.bar' : func_action,
                                                 '$BAR_SUFFIX' : func_action,
                                                 '$FOO_SUFFIX' : func_action })

        tgt = builder(env, target='test4', source=['test4.BAR2'])[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase)
        try:
            tgt.build()
            flag = 1
        except SCons.Errors.UserError as e:
            print(e)
            flag = 0
        assert flag, "It should be possible to define actions in composite builders using variables."
        env['FOO_SUFFIX'] = '.BAR2'
        builder.add_action('$NEW_SUFFIX', func_action)
        flag = 0
        try:
            builder(env, target='test5', source=['test5.BAR2'])[0]
        except SCons.Errors.UserError:
            flag = 1
        assert flag, "UserError should be thrown when we call a builder with ambigous suffixes."

    def test_src_builder(self):
        """Test CompositeBuilder's use of a src_builder"""
        env = Environment()

        foo_bld = SCons.Builder.Builder(action = 'a-foo',
                                        src_suffix = '.ina',
                                        suffix = '.foo')
        assert isinstance(foo_bld, SCons.Builder.BuilderBase)
        builder = SCons.Builder.Builder(action = { '.foo' : 'foo',
                                                   '.bar' : 'bar' },
                                        src_builder = foo_bld)
        assert isinstance(builder, SCons.Builder.CompositeBuilder)
        assert isinstance(builder.action, SCons.Action.CommandGeneratorAction)

        tgt = builder(env, target='t1', source='t1a.ina t1b.ina')[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase)

        tgt = builder(env, target='t2', source='t2a.foo t2b.ina')[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase), tgt.builder.__dict__

        bar_bld = SCons.Builder.Builder(action = 'a-bar',
                                        src_suffix = '.inb',
                                        suffix = '.bar')
        assert isinstance(bar_bld, SCons.Builder.BuilderBase)
        builder = SCons.Builder.Builder(action = { '.foo' : 'foo'},
                                        src_builder = [foo_bld, bar_bld])
        assert isinstance(builder, SCons.Builder.CompositeBuilder)
        assert isinstance(builder.action, SCons.Action.CommandGeneratorAction)

        builder.add_action('.bar', 'bar')

        tgt = builder(env, target='t3-foo', source='t3a.foo t3b.ina')[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase)

        tgt = builder(env, target='t3-bar', source='t3a.bar t3b.inb')[0]
        assert isinstance(tgt.builder, SCons.Builder.BuilderBase)

        flag = 0
        try:
            builder(env, target='t5', source=['test5a.foo', 'test5b.inb'])[0]
        except SCons.Errors.UserError as e:
            flag = 1
            err = e
        assert flag, "UserError should be thrown when we call a builder with files of different suffixes."
        expect = "While building `['t5']' from `test5b.bar': Cannot build multiple sources with different extensions: .foo, .bar"
        assert str(err) == expect, err

        flag = 0
        try:
            builder(env, target='t6', source=['test6a.bar', 'test6b.ina'])[0]
        except SCons.Errors.UserError as e:
            flag = 1
            err = e
        assert flag, "UserError should be thrown when we call a builder with files of different suffixes."
        expect = "While building `['t6']' from `test6b.foo': Cannot build multiple sources with different extensions: .bar, .foo"
        assert str(err) == expect, err

        flag = 0
        try:
            builder(env, target='t4', source=['test4a.ina', 'test4b.inb'])[0]
        except SCons.Errors.UserError as e:
            flag = 1
            err = e
        assert flag, "UserError should be thrown when we call a builder with files of different suffixes."
        expect = "While building `['t4']' from `test4b.bar': Cannot build multiple sources with different extensions: .foo, .bar"
        assert str(err) == expect, err

        flag = 0
        try:
            builder(env, target='t7', source=[env.fs.File('test7')])[0]
        except SCons.Errors.UserError as e:
            flag = 1
            err = e
        assert flag, "UserError should be thrown when we call a builder with files of different suffixes."
        expect = "While building `['t7']': Cannot deduce file extension from source files: ['test7']"
        assert str(err) == expect, err

        flag = 0
        try:
            builder(env, target='t8', source=['test8.unknown'])[0]
        except SCons.Errors.UserError as e:
            flag = 1
            err = e
        assert flag, "UserError should be thrown when we call a builder target with an unknown suffix."
        expect = "While building `['t8']' from `['test8.unknown']': Don't know how to build from a source file with suffix `.unknown'.  Expected a suffix in this list: ['.foo', '.bar']."
        assert str(err) == expect, err

if __name__ == "__main__":
    unittest.main()

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