This compiler supports a minuscule subset of Stratego:
- Conditionals
a < b + c,id,fail, andall - Rules parameterised by strategies:
bottomup(s) = all(bottomup(s)); s - Term construction and strategy application
!Add(<s> Succ(x),y) - Pattern matching:
Add(Succ(x),y) -> ...
It has the following (mis)features:
- It compiles each term constructor to a Java class
- It compiles pattern matching to nested case trees
- It compiles strategy control flow directly to Java control flow by (ab)using labeled
break - It (blindly) specializes all strategy arguments (in certain cases this may cause the compiler to loop -- so a realistic compiler would need to detect this and compile those calls differently)
- It inlines all strategies that are called only once
- It does some local optimisations
- It does not have a parser, so you have to write down the AST
- It does not have error checking, so it's garbage in - garbage out
- It has been tested on a single example