Sinclair QL

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SuperBASIC syntax IS defined uSing a non·rigorous 'meta language' type notation. Four
types
of construction are used:
I I Select one of
[ ] Enclosed item(s) are optional
** Enclosed items are repeated
.. Range
II Comment
eg IAIBI AorB
[ A ] A is optional
* A * A is repeated
A..Z
A, B, C, etc
[this IS a comment]
Consider a SuperBASIC identifier:
A sequence
of numbers, digitS, underscores, starting with a letter and finishing with an
optional % or $
Jetter.= I A.Z
laz
[a letter is one of: ABCDEFGHIJKLMNOPQRSTUVWXYZ]
or abcdefghijklmnopqrstuvwxyz
digit= I 0 I 1 I 2 I 3 I 4 I 5 I 6 I 7 I 8 I 9 I
[a digit is 0 or 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9]
underscore: = _
[an underscore is _]
identifier =letter ~ [Jetter I digit I underscore J,* I % I $ I
must start~ ]
with a letter
a sequence
of letters
digits and underscores
i.e. repeat something
which
is optional
12/84
syntax
definitions
53