| Commit message (Collapse) | Author | Age | Files | Lines |
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1. Rename cardinality into rank. Shorter word, easier to
understand, more appropriate in our context.
2. Previously we called any dollar substitution splicing
but this is not consistent with Scheme where splicing
is substitution with non-zero rank.
So now $foo is unquoting and ..$foo and ...$foo is
unquote splicing or just splicing. Correspondingly
splicee becomes unquotee.
3. Rename si7980 test into t7980
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Adds support for patterns like:
val q"{ ..$init; $last }" = q"{ a; b; c }"
// init == List(q"a", q"b")
// last == q"c"
Which under the hood get compiled as `:+` patterns:
SyntacticBlock(init :+ last)
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This commit extends current splicing rules to allow flattening of
trees into other trees.
Without such support it is impossible to correctly create vals with
patterns and use it in other location as they could expand into
multiple-statement blocks:
scala> q"val (a, b) = (1, 2)"
res0: reflect.runtime.universe.Tree =
{
<synthetic> <artifact> private[this] val x$1 = scala.Tuple2(1, 2):
@scala.unchecked match {
case scala.Tuple2((a @ _), (b @ _)) => scala.Tuple2(a, b)
};
val a = x$1._1;
val b = x$1._2;
()
}
scala> q"..$res0; println(a + b)"
res1: reflect.runtime.universe.Tree =
{
<synthetic> <artifact> private[this] val x$1 = scala.Tuple2(1, 2):
@scala.unchecked match {
case scala.Tuple2((a @ _), (b @ _)) => scala.Tuple2(a, b)
};
val a = x$1._1;
val b = x$1._2;
println(a.$plus(b))
}
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This commit performs a number of preliminary refactoring needed to
implement unliftable:
1. Replace previous inheritance-heavy implementation of Holes with
similar but much simpler one. Holes are now split into two different
categories: ApplyHole and UnapplyHole which correspondingly represent
information about holes in construction and deconstruction quasiquotes.
2. Make Placeholders extract holes rather than their field values. This
is required to be able to get additional mode-specific information
from holes (e.g. only ApplyHoles have types).
3. Bring ApplyReifier & UnapplyReifier even closer to the future where
there is just a single base Reifier with mode parameter.
Along the way a few bugs were fixed:
1. SI-7980 SI-7996 fail with nice error on bottom types splices
2. Use asSeenFrom instead of typeArguments in parseCardinality.
This fixes a crash if T <:< Iterable[Tree] but does not itself
have any type arguments.
3. Fix spurious error message on splicing of Lists through Liftable[List[T]]
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Previously trees that represent parameters, case clauses and
type variables had strictly defined ValDef, TypeDef and CaseDef
types which caused problems in compositionality.
Now this checks are moved to runtime so it's possible to pass
a tree that is CaseDef but has Tree type.
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Previously due to limited support for expansion in apply position
quasiquotes had to use a compiler hook for deconstruction. Now with
recent changes in pattern matcher it's possible to remove that special
case.
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This is achieved in a following way:
1. Similarly to toolbox quasiquotes can go away with wrapping for
parsing purpose after introduction of `parseStats` and `parseRule`
entry points.
2. In case of syntax error quasiquote computes equivalent corresponding
position in the source code with the help of `corrrespondingPosition`
mapper which relies on position data collected into `posMap` during
code generation.
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Introduces an extensive ScalaCheck-based test suite for recently
implemented quasiquotes. Provides tools for syntactic tree comparison
and verifying compilation error messages.
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