Vampire methods

Feb 20, 2015Download as PPT, PDF0 likes313 views

The document discusses generating a local CatMatcher class using macros in Scala to match properties of Cat objects, including exploring different approaches for implementing matchers for properties like age within the macro, addressing issues that come up, and eventually confirming they were able to generate the matchers.

Local CatMatcher
http://stackoverflow.com/questions/18480707/method-cannot-
be-accessed-in-macro-generated-class
Don��t forget the {}!

Grab the Cat
TypeTag not accessible in a macro!

Inception matcher
Builder pattern
Matcher methods
// CatMatcher

Inception matcher
Cat matcher
Internal state

Inception matcher
new constraint =>
new matcher function
name/age/kitten methods
list of c.Expr[_]

Mirror, mirror
structural type =>
reflection :-(
// age
// matchA[Cat].age(6)
// Int

Yo, I heard you like macros
No structural type!

Yo, I heard you like macros
Annotation code
// @fieldMatcherBody(expected => cat.age must_== expected)
// val expected = 6
// cat.age must_== expected

Yo, I heard you like macros
extract parameter/body

Transformers
// 6
// `prefix` represents an equivalent of
// `this` for normal instance methods
// body:
// CatMatcher.this.addMatcher((_:Cat).age must_== arg)

Transformers
http://stackoverflow.com/questions/18523871/use-this-in-a-
generated-macro-method

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