SYMBOL ambiguity

[geographika]

There are currently two ambiguities that remain in the grammar.

1. SYMBOL can in some cases be used as a composite type, and sometimes as an attribute. E.g.

SYMBOL
  NAME "circle"
  TYPE ellipse
  FILLED true
  POINTS
    1 1
  END
END

And sometimes it can be used as a simple keyword / value pair e.g.

SYMBOL "symbol_name
SYMBOL 0 # reference a symbol from a SYMBOLSET

Everything currently works fine for cases such as:

SYMBOL"barb_warm"

But in cases without quotes, such as the following, fail:

SYMBOL barb_warm

Not sure if anything can be done about this. If not then these will always need to be quoted.
There is a test for this in test_snippets.py - test_symbol_style2().

A possible solution is to have an unquoted string type, a KEYWORD type which only accepts letters (case-insensitive)
for attribute names, and a more permissive type that accepts underscores, numbers, and hyphens that could
be used for attribute values.

2. STYLE - this is typically a class such as:

STYLE
  SYMBOL 'hatch-test'
  COLOR 255 0 0
  ANGLE [MYROTATE]
  SIZE 4.0
  WIDTH 3.0
END

However it is also used in a two other classes as an attribute e.g. in a SCALEBAR and in a QUERYMAP. E.g.

SCALEBAR
    STYLE 0
END

[geographika]

Fixed in the v1.0.0 release