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

"""
Test LEX and LEXFLAGS with a live lex.
"""

import TestSCons

_exe = TestSCons._exe
_python_ = TestSCons._python_

test = TestSCons.TestSCons()

lex = test.where_is('lex') or test.where_is('flex')

if not lex:
    test.skip_test('No lex or flex found; skipping test.\n')



test.write("wrapper.py", """import os
import sys
open('%s', 'wb').write("wrapper.py\\n")
os.system(" ".join(sys.argv[1:]))
""" % test.workpath('wrapper.out').replace('\\', '\\\\'))

test.write('SConstruct', """
foo = Environment()
lex = foo.Dictionary('LEX')
bar = Environment(LEX = r'%(_python_)s wrapper.py ' + lex,
                  LEXFLAGS = '-b')
foo.Program(target = 'foo', source = 'foo.l')
bar.Program(target = 'bar', source = 'bar.l')
""" % locals())

lex = r"""
%%%%
a       printf("A%sA");
b       printf("B%sB");
%%%%
int
yywrap()
{
    return 1;
}

main()
{
    yylex();
}
"""

test.write('foo.l', lex % ('foo.l', 'foo.l'))

test.write('bar.l', lex % ('bar.l', 'bar.l'))

test.run(arguments = 'foo' + _exe, stderr = None)

test.must_not_exist(test.workpath('wrapper.out'))
test.must_not_exist(test.workpath('lex.backup'))

test.run(program = test.workpath('foo'), stdin = "a\n", stdout = "Afoo.lA\n")




test.run(arguments = 'bar' + _exe)

test.must_match(test.workpath('wrapper.out'), "wrapper.py\n")
test.must_exist(test.workpath('lex.backup'))

test.run(program = test.workpath('bar'), stdin = "b\n", stdout = "Bbar.lB\n")



test.pass_test()

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