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fix array problems, limit size of arrays.

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Irmen de Jong
2018-10-23 00:52:51 +02:00
parent b8f3f942d4
commit a825bbff96
8 changed files with 110 additions and 49 deletions
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22
docs/source/programming.rst
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@ -184,14 +184,14 @@ When declaring a numeric variable it is possible to specify the initial value, i
For other data types it is required to specify that initial value it should get.
Values will usually be part of an expression or assignment statement::
12345 ; integer number
$aa43 ; hex integer number
%100101 ; binary integer number
"Hi, I am a string" ; text string
'a' ; petscii value (byte) for the letter a
-33.456e52 ; floating point number
12345 ; integer number
$aa43 ; hex integer number
%100101 ; binary integer number
"Hi, I am a string" ; text string
'a' ; petscii value (byte) for the letter a
-33.456e52 ; floating point number
byte counter = 42 ; variable of size 8 bits, with initial value 42
byte counter = 42 ; variable of size 8 bits, with initial value 42
Array and Matrix (2-dimensional array) types are also supported.
@ -207,9 +207,14 @@ Arrays can be made of bytes, words and floats. Matrixes can oly be made of bytes
value = matrix[4,2] ; the byte at the 5th column and 3rd row in the matrix
char = string[4] ; the fifth character (=byte) in the string
.. note::
Right now, the array and matrix size should be small enough to be indexable by a single byte index.
This means byte arrays and matrixes should be <= 256 elements, word arrays <= 128 elements, and float
arrays <= 51 elements. This limit may be lifted in a future version.
Note that the various keywords for the data type and variable type (``byte``, ``word``, ``const``, etc.)
cannot be used as *identifiers* elsewhere. You can't make a variable, block or subroutine with the name ``byte``
can't be used as *identifiers* elsewhere. You can't make a variable, block or subroutine with the name ``byte``
for instance.
.. todo::
@ -342,6 +347,7 @@ You can also create loops by using the ``goto`` statement, but this should usual
The value of the loop variable or register after executing the loop *is undefined*. Don't use it immediately
after the loop without first assigning a new value to it!
(this is an optimization issue to avoid having to deal with mostly useless post-loop logic to adjust the loop variable's value)
Loop variables that are declared inline are scoped in the loop body so they're not accessible at all after the loop finishes.
Conditional Execution