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      1 #!/usr/bin/python
      2 #
      3 # Copyright (C) 2009 Google Inc. All rights reserved.
      4 # 
      5 # Redistribution and use in source and binary forms, with or without
      6 # modification, are permitted provided that the following conditions are
      7 # met:
      8 # 
      9 #     * Redistributions of source code must retain the above copyright
     10 # notice, this list of conditions and the following disclaimer.
     11 #     * Redistributions in binary form must reproduce the above
     12 # copyright notice, this list of conditions and the following disclaimer
     13 # in the documentation and/or other materials provided with the
     14 # distribution.
     15 #     * Neither the name of Google Inc. nor the names of its
     16 # contributors may be used to endorse or promote products derived from
     17 # this software without specific prior written permission.
     18 # 
     19 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 #
     31 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
     32 # Use of this source code is governed by a BSD-style license that can be
     33 # found in the LICENSE file.
     34 
     35 # usage: action_maketokenizer.py OUTPUTS -- INPUTS
     36 #
     37 # Multiple INPUTS may be listed. The sections are separated by -- arguments.
     38 #
     39 # OUTPUTS must contain a single item: a path to tokenizer.cpp.
     40 #
     41 # INPUTS must contain exactly two items. The first item must be the path to
     42 # maketokenizer. The second item must be the path to tokenizer.flex.
     43 
     44 
     45 import os
     46 import subprocess
     47 import sys
     48 
     49 
     50 def SplitArgsIntoSections(args):
     51     sections = []
     52     while len(args) > 0:
     53         if not '--' in args:
     54             # If there is no '--' left, everything remaining is an entire section.
     55             dashes = len(args)
     56         else:
     57             dashes = args.index('--')
     58 
     59         sections.append(args[:dashes])
     60 
     61         # Next time through the loop, look at everything after this '--'.
     62         if dashes + 1 == len(args):
     63             # If the '--' is at the end of the list, we won't come back through the
     64             # loop again. Add an empty section now corresponding to the nothingness
     65             # following the final '--'.
     66             args = []
     67             sections.append(args)
     68         else:
     69             args = args[dashes + 1:]
     70 
     71     return sections
     72 
     73 
     74 def main(args):
     75     sections = SplitArgsIntoSections(args[1:])
     76     assert len(sections) == 2
     77     (outputs, inputs) = sections
     78 
     79     assert len(outputs) == 1
     80     output = outputs[0]
     81 
     82     assert len(inputs) == 2
     83     maketokenizer = inputs[0]
     84     flexInput = inputs[1]
     85 
     86     # Do it. check_call is new in 2.5, so simulate its behavior with call and
     87     # assert.
     88     outfile = open(output, 'wb')
     89     p1 = subprocess.Popen(['flex', '-t', flexInput], stdout=subprocess.PIPE)
     90     p2 = subprocess.Popen(['perl', maketokenizer], stdin=p1.stdout, stdout=outfile)
     91 
     92     r1 = p1.wait()
     93     r2 = p2.wait()
     94     assert r1 == 0
     95     assert r2 == 0
     96 
     97     return 0
     98 
     99 
    100 if __name__ == '__main__':
    101     sys.exit(main(sys.argv))
    102