Source

SCons / test / Scanner / scan-once.py

#!/usr/bin/env python
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Verify that Scanners are called just once.
"""

import TestSCons

test = TestSCons.TestSCons()

test.write('SConstruct', r"""
import os.path

def scan(node, env, envkey, arg):
    print 'XScanner: node =', os.path.split(str(node))[1]
    return []

def exists_check(node, env):
    return os.path.exists(str(node))

XScanner = Scanner(name = 'XScanner',
                   function = scan,
                   argument = None,
                   scan_check = exists_check,
                   skeys = ['.x'])

def echo(env, target, source):
    t = os.path.split(str(target[0]))[1]
    s = os.path.split(str(source[0]))[1]
    print 'create %s from %s' % (t, s)

Echo = Builder(action = Action(echo, None),
               src_suffix = '.x',
               suffix = '.x')

env = Environment(BUILDERS = {'Echo':Echo}, SCANNERS = [XScanner])

f1 = env.Echo(source=['file1'], target=['file2'])
f2 = env.Echo(source=['file2'], target=['file3'])
f3 = env.Echo(source=['file3'], target=['file4'])
""")

test.write('file1.x', 'file1.x\n')

test.run(stdout = test.wrap_stdout("""\
XScanner: node = file1.x
create file2.x from file1.x
create file3.x from file2.x
create file4.x from file3.x
"""))

test.write('file2.x', 'file2.x\n')

test.run(stdout = test.wrap_stdout("""\
XScanner: node = file1.x
XScanner: node = file2.x
create file3.x from file2.x
create file4.x from file3.x
"""))

test.write('file3.x', 'file3.x\n')

test.run(stdout = test.wrap_stdout("""\
XScanner: node = file1.x
XScanner: node = file2.x
XScanner: node = file3.x
create file4.x from file3.x
"""))

test.pass_test()

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