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ISSUE-2368: Problems with grammars for numbers

From: Cameron McCormack <cam@mcc.id.au>
Date: Tue, 7 Dec 2010 11:03:26 +1300
To: public-svg-wg@w3.org
Cc: cyril.concolato@telecom-paristech.fr
Message-ID: <20101206220326.GA17596@wok.mcc.id.au>
ISSUE-2368 is as follows:

  The grammar for path data uses the following grammar:
  [[
  floating-point-constant:
      fractional-constant exponent?
      | digit-sequence exponent
  ]]
  It seems that if no fractional-constant is used (no '.') an exponent
  component is required.

  The same problem is present in the grammar for points in polygons and
  polylines, because the grammar is duplicated.

I don’t think there is a problem, because floating-point-constant is not
intended to capture numbers that match /^[0-9]+$/.  The only references
to floating-point-constant are:

  nonnegative-number:
    integer-constant
    | floating-point-constant
  number:
    sign? integer-constant
    | sign? floating-point-constant
  integer-constant:
    digit-sequence

so we’re safe.  Cyril: can you confirm?

The issue also has:

  Finally, there should be tests in the test suite with:
  - a number with no digit after and before a "."
  - a number no digit after exponent

so I’ve raised ISSUE-2393 on the SVG 2 test suite to add such tests.

Finally, I see that ISSUE-2368 is on “SVG 1.1 F2  Last Call”, but the
original Last Call comment is not linked from the issue.  Was there one?
Or was it just from Cyril?  If the latter, I guess it shouldn’t be a LC
comment.

Thanks,

Cameron

-- 
Cameron McCormack ≝ http://mcc.id.au/
Received on Monday, 6 December 2010 22:04:05 GMT

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