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unify tuple expressions (#13793)

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* unify tuple expressions

* fix test

* fix test

* apply feedback

* Handle empty tuples

* Fix rendering named unary tuple

* Protect static NimNode against stripping

* Slightly less hacky

* Revert "Slightly less hacky"

This reverts commit 170c5aec0addc029f637afbc948700ca006b7942.

* Slightly less hacky

* Cleanup

* Fix test

* Fix another test

* Add condsym

* Rebase fallout

* changelog: Move from compiler changes to language changes

* Add stricter tests

* Add empty tuple example to doc/astspec

* Fix test

Co-authored-by: Clyybber <darkmine956@gmail.com>
This commit is contained in:
Arne Döring 2021-03-30 02:06:51 +02:00 • committed by GitHub
commit 159c06e045
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13 changed files with 136 additions and 32 deletions
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15
compiler/parser.nim
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@ -421,10 +421,9 @@ proc exprColonEqExprListAux(p: var Parser, endTok: TokType, result: PNode) =
var a = exprColonEqExpr(p)
result.add(a)
if p.tok.tokType != tkComma: break
getTok(p)
# (1,) produces a tuple expression
if endTok == tkParRi and p.tok.tokType == tkParRi and result.kind == nkPar:
elif result.kind == nkPar:
result.transitionSonsKind(nkTupleConstr)
getTok(p)
skipComment(p, a)
optPar(p)
eat(p, endTok)
@ -584,7 +583,10 @@ proc parsePar(p: var Parser): PNode =
semiStmtList(p, result)
elif p.tok.tokType == tkCurlyDotLe:
result.add(parseStmtPragma(p))
elif p.tok.tokType != tkParRi:
elif p.tok.tokType == tkParRi:
# Empty tuple '()'
result.transitionSonsKind(nkTupleConstr)
else:
var a = simpleExpr(p)
if p.tok.tokType == tkDo:
result = postExprBlocks(p, a)
@ -605,13 +607,14 @@ proc parsePar(p: var Parser): PNode =
semiStmtList(p, result)
else:
a = colonOrEquals(p, a)
if a.kind == nkExprColonExpr:
result.transitionSonsKind(nkTupleConstr)
result.add(a)
if p.tok.tokType == tkComma:
getTok(p)
skipComment(p, a)
# (1,) produces a tuple expression:
if p.tok.tokType == tkParRi:
result.transitionSonsKind(nkTupleConstr)
result.transitionSonsKind(nkTupleConstr)
# progress guaranteed
while p.tok.tokType != tkParRi and p.tok.tokType != tkEof:
var a = exprColonEqExpr(p)