BIND 10 #2369: InputSource helper class for MasterLexer

[BIND 10 Development]

#2369: InputSource helper class for MasterLexer
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                   Reporter:         |                 Owner:  muks
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20121106
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  libdns++                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by muks):

 Replying to [comment:12 jinmei]:
 > Another thing I've just noticed: I'd like to throw an exception
 > from the `InputSource` constructor (the file version) if it fails to
 > open it.  It will be handled in `MasterLexer::open()` or at the
 > application.  And, of course we need a test case for this first, if it
 > doesn't exist yet.

 Done now. I've also added complete checks for file based input source.

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Ticket URL: <http://bind10.isc.org/ticket/2369#comment:13>
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