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Mapping properties

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Tinhinane View Drop Down
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Joined: 16.Mar.2018
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tinhinane Quote  Post ReplyReply Direct Link To This Post Topic: Mapping properties
    Posted: 02.May.2018 at 20:32
Hello,

I am using MetaEdit+ to describe a small language for automation. What I want to do is to map my objects states with signal states; meaning say a Switch object with property 'state' (fixed list) [Pressed, Released], I want to map that with [1, 0]. Is there a way to add that on top of my language?
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stevek View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stevek Quote  Post ReplyReply Direct Link To This Post Posted: 02.May.2018 at 21:30
DSM is about raising the level of abstraction, so the default answer would be that the language should be human-readable - just Pressed/Released - and the generator should be responsible for mapping that to 1/0. 

With just two values, you can simply say "if :state='Pressed' then '1' else '0' endif". If there were more values, I often like to put the mapping as a translator rather than logic:
to '%stateValue
$Pressed $1
$Released $0'
endto

:state%stateValue
If some strings on the left-hand side of the translator are substrings of later strings, either re-order or switch to using more precise regular expressions like /^Pressed$/.
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