Add runtime.quoted.Matcher #6042
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This allows to match a quote against another quote while extracting the contents of defined holes. This will be used in as desugaring of quoted patterns.
```scala
def optimize(expr: Expr[Int]): Expr[Int] = expr match {
case '{ 0 + $y } => optimize(y)
case '{ ${Literal(a)} + ${Literal(b)} } => (a + b).toExpr
case '{ ${x} + ${y @ Literal(_)} } => optimize('{ $y + $x })
...
case expr => expr
}
```
`Int`s already have these optimization baked in, it is just a simple example. We would use this directly on any custom DSL instead.
This PR adds:
* runtime logic for pattern matching on `'{ ... }`
* `Literal` pattern to match a literal expression and extract its value
* `Binding` pattern to match a reference to some val/var/def
* `Repeated` pattern to match an explicit sequence of expressions
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This allows to match a quote against another quote while extracting the contents of defined holes. This will be used in as desugaring of quoted patterns.
Ints already have these optimization baked in, it is just a simple example. We would use this directly on any custom DSL instead.This PR adds:
'{ ... }Literalpattern to match a literal expression and extract its valueBindingpattern to match a reference to some val/var/defRepeatedpattern to match an explicit sequence of expressions