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Home ^{c2iec home (WikiPage)}
Why ST is a very robust and easy to understand language. A good fit for industrial applications. But on the internet you find by far more example algorithms, applications and libraries written in C or other languages. The mission of this project is to make the step from a working C example code to a working ST code as small as possible. Technique The transpiler is built using the very old but famous and solid compiler builder tools flex and yacc / bison. So the code transformation consists only of two steps: flex: tokenize the ANSI C code bison: parse and transform the tokens to ST code As the transformations from the tokens to the resulting ST code is done in just one step, we have to live with a few limitations, which can't be transformed as the ST language doesn't support those language constructs. Features The following features are currently tested, and should work therefore: feature C ST expressions a = b * (c + d) * e; a := b * ( c + d ) * e; lvalues c++; ((c:=c+1)-1); case switch (value) CASE value OF for for (i=0; i < 5; i++) WHILE i < 5; while while (x < 10) WHILE x < 10 DO named structs / unions struct test TYPE test: STRUCT unnamed structs / unions union ...; flattened as members into the type in which they are embedded typedef typedef struct ... t_struct; TYPE t_struct: Id2036658550; arrays char arr2[1][2]; arr2: ARRAY[0..(1-1),0..(2-1)] OF BYTE; Limitations The following features will definitely not be supported by this transpiler, because of its design. Explicit type conversions of user defined data types (e.g. structs) Function pointers Pointer arithmetics Static variables or functions Usage This project is in a proof-of-concept phase. So it can't be easily used, yet, nor would I try to encourage non-experienced people to use it in this state. If your code is proberly pre processed, you can quickly try it with the web-version of the transpiler.
Last updated: 2020-06-30

Post by ingo on #3 Unary operators are not working ^{c2iec tickets (Post)}
Nice idea! Actually I already thought of inventing a runtime library (emscripting is doing it similar). Then I could pass the variable by reference, to increment it, and return the old value as a result. But would this work with an Any-Type? Because in the place where I get the operator I don't know the datatype. Not sure, yet. BR, Ingo
Last updated: 2020-07-06

Post by i-campbell on #3 Unary operators are not working ^{c2iec tickets (Post)}
if i is a DINT you can use __XADD(ADR(i) , 1) for i++
Last updated: 2020-07-06

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Home (version 2) discussion ^{c2iec home (Thread)}
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