59 lines
1.6 KiB
Plaintext
59 lines
1.6 KiB
Plaintext
/** md
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Title: Running a Strategy, continued
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## Disjunctive Normal Form
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The next Stratego example, in {! ../docrefs/sec4.2.md !}, extends
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`prop-eval-rules` to convert SPL propositions into disjunctive normal form (DNF).
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Once again, we can place the Stratego code in `trans/prop-dnf-rules.str`:
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```Stratego
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**/
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/** md Include this code in documentation: */
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module prop-dnf-rules
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imports prop-eval-rules
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rules
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E : Impl(x, y) -> Or(Not(x), y)
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E : Eq(x, y) -> And(Impl(x, y), Impl(y, x))
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E : Not(Not(x)) -> x
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E : Not(And(x, y)) -> Or(Not(x), Not(y))
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E : Not(Or(x, y)) -> And(Not(x), Not(y))
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E : And(Or(x, y), z) -> Or(And(x, z), And(y, z))
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E : And(z, Or(x, y)) -> Or(And(z, x), And(z, y))
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/* end of code inclusion **/
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/** md rest of documentation
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```
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and create a `trans/prop-dnf.str` that defines a strategy for applying the
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DNF rules and supplies the glue needed between ESV and Stratego:
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```Stratego
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{! prop-dnf.str !}
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```
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Now just importing `prop-dnf` in `trans/spoofax-propositional-language.str`
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and adding a menu item to `editor/Manual.esv`:
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```ESV
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...
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{! ../editor/Manual.esv extract: {start: menus} !}
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```
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should suffice to make the dnf strategy available in the "Spoofax > Manual"
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menu.
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Indeed, we can try it out on `syntax/examples/sec4.2_test3.spl`:
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```SPL
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{! ../syntax/examples/sec4.2_test3.spl !}
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```
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to produce
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```
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{! ../syntax/examples/sec4.2_test3.dnf.aterm !}
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```
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as verified in the manual (again, modulo the"ATom" typo in the manual).
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However, we also want to use this second example to show another method of
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running Stratego strategies from the Eclipse IDE.
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## Spoofax Testing Language
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CONTINUE FROM HERE
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**/ |