Christian Schmidt wrote:
Hi Bruce,
thanks for your answer.
How much python will you let your users execute?
Potentially everything that can be put into
ScriptEngine.CreateScriptSourceFromString(
Expression, _SourceCodeKind.Expression_).Execute(ScriptScope)
Are they just typing in formulas or are they accessing data structure?
Normally they type in simple formulas. But they are also allowed to
type in formulas that access functions, properties of
classes/objects/data structures and generators.
The Python Tutorial http://docs.python.org/tutorial/index.html or
http://www.diveintopython.org might be a good place to start, but if
they will not be allowed to forms loops, etc both might be too much.
These are all nicely written introductions to python "programming".
But that's too much: As Expression one can only enter "one-liners" -
no structured programs, no function or class definitions, no control
flow, no import statements ... simply no statements at all.
Can you post an example if what someone would be entering with your
program?
"Distance * AvgSpeed"
"Distance**0.9 if Distance > 0 else 5"
"sum([pos.time for pos in positions where pos.type = 7])"
"complicated_function1(a,b) + complicated_function2({ param1: c,
param2: 42 })"
where Distance, AvgSpeed, positions, a, b, c, ... are variables from
the ScriptScope.
Unfortunately I don't think such a documentation exists (not that I'm
aware of but the internets is a big place). I wish it did - and if you
write one then please make it public.
The Python grammar is a good place to get the definitive syntax allowed
in expressions, at least if you can read BNF.
Michael
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