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fix RFC #341: dot-like operators are now parsed with same precedence as . (#18711)

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* fix RFC #341: dot-like operators are now parsed with same precedence as `.`

* fixup

* [skip ci] address comment in changelog

* address comment

* update grammmar

* add manual entry

* fixup

* -d:nimPreviewDotLikeOps

* address comment to unblock PR: move nimPreviewDotLikeOps out of config/config.nims
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Timothee Cour 2021-08-24 21:50:40 -07:00 • committed by GitHub
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7 changed files with 74 additions and 5 deletions
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1
tests/config.nims
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@ -36,3 +36,4 @@ switch("define", "nimExperimentalAsyncjsThen")
switch("define", "nimExperimentalLinenoiseExtra")
switch("define", "nimPreviewFloatRoundtrip")
switch("define", "nimPreviewDotLikeOps")

27
tests/misc/trfc_341.nim Normal file
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@ -0,0 +1,27 @@
# test for https://github.com/nim-lang/RFCs/issues/341
import std/json
import std/jsonutils
import std/macros
macro fn1(a: untyped): string = newLit a.lispRepr
doAssert fn1(a.?b.c) == """(DotExpr (Infix (Ident ".?") (Ident "a") (Ident "b")) (Ident "c"))"""
template `.?`(a: JsonNode, b: untyped{ident}): JsonNode =
a[astToStr(b)]
proc identity[T](a: T): T = a
proc timesTwo[T](a: T): T = a * 2
template main =
let a = (a1: 1, a2: "abc", a3: (a4: 2.5))
let j = a.toJson
doAssert j.?a1.getInt == 1
doAssert j.?a3.?a4.getFloat == 2.5
doAssert j.?a3.?a4.getFloat.timesTwo == 5.0
doAssert j.?a3.identity.?a4.getFloat.timesTwo == 5.0
doAssert j.identity.?a3.identity.?a4.identity.getFloat.timesTwo == 5.0
doAssert j.identity.?a3.?a4.identity.getFloat.timesTwo == 5.0
static: main()
main()