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1.9

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Irmen de Jong 2019-07-09 08:42:38 +02:00
parent 5b9cc9592f
commit e8caf6d319
3 changed files with 37 additions and 9 deletions
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2
compiler/res/version.txt
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@ -1 +1 @@
1.9-dev 1.9

17
docs/source/programming.rst
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@ -361,8 +361,11 @@ You can also create loops by using the ``goto`` statement, but this should usual
Loop variables that are declared inline are scoped in the loop body so they're not accessible at all after the loop finishes. 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 (IF) Conditional Execution
-------------------------- ---------------------
if statements
^^^^^^^^^^^^^
Conditional execution means that the flow of execution changes based on certiain conditions, Conditional execution means that the flow of execution changes based on certiain conditions,
rather than having fixed gotos or subroutine calls:: rather than having fixed gotos or subroutine calls::
@ -413,11 +416,15 @@ So ``if_cc goto target`` will directly translate into the single CPU instruction
Maybe in the future this will be a separate nested scope, but for now, that is Maybe in the future this will be a separate nested scope, but for now, that is
only possible when defining a subroutine. only possible when defining a subroutine.
When - statement (jumptable) when statement (jumptable)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^
.. attention:: .. attention::
TODO: docs for this this must still be written TODO: docs for this this must still be written.
TODO: the code generator for this is not yet working.
Use a ``when`` statement if you have a set of choices that each should result in a certain
action. It's more readable (and results in faster code) than using a lot of if / else statements.
Assignments Assignments

27
docs/source/syntaxreference.rst
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@ -610,7 +610,28 @@ The XX corresponds to one of the eigth branching instructions so the possibiliti
``if_cs``, ``if_cc``, ``if_eq``, ``if_ne``, ``if_pl``, ``if_mi``, ``if_vs`` and ``if_vc``. ``if_cs``, ``if_cc``, ``if_eq``, ``if_ne``, ``if_pl``, ``if_mi``, ``if_vs`` and ``if_vc``.
It can also be one of the four aliases that are easier to read: ``if_z``, ``if_nz``, ``if_pos`` and ``if_neg``. It can also be one of the four aliases that are easier to read: ``if_z``, ``if_nz``, ``if_pos`` and ``if_neg``.
**When - statement (jumptable)** when statement (jumptable)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^
.. attention:: .. attention::
TODO: docs for this this must still be written TODO: docs for this this must still be written.
TODO: the code generator for this is not yet working.
The condition value can only be an integer datatype.
The choice values must be constant integer values.
code example::
when 4+A+Y {
10 -> {
c64scr.print("ten")
}
5 -> c64scr.print("five")
30 -> c64scr.print("thirty")
99 -> c64scr.print("nn")
55 -> {
; will be optimized away
}
else -> {
c64scr.print("!??!\n")
}
}