BIND 10 #2572: extend MasterLexer to provide current/total bytes of source(s)

[BIND 10 Development]

#2572: extend MasterLexer to provide current/total bytes of source(s)
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  jinmei
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130122
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by jelte):

 * owner:  jelte => jinmei


Comment:

 Very general question/consideration; do we want to support being able to
 read from inputs where file size is undefined? (i.e. not error on -1 but
 just report 'unknown' so that you can, for instance, pipe cin to parse
 from?)

 master_lexer.h:

 getPosition: the note about 'if a source is pushed, this method will
 normally return a smaller number', is that 'when a source is pushed due to
 encountered data like the $INCLUDE directive' (which has an unget
 somewhere)? If so it might make sense, otherwise i don't see how the
 position would move back, or am I misunderstanding something here?


 Code itself looks ok

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Ticket URL: <https://bind10.isc.org/ticket/2572#comment:6>
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