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[clang-format] Refine structured binding detection

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Summary:
Revision r356575 had the unfortunate consequence that now clang-format never
detects an ObjC call expression after `&&`.

This patch tries harder to distinguish between C++17 structured bindings and
ObjC call expressions and adds a few regression tests.

Reviewers: klimek

Reviewed By: klimek

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D59774

llvm-svn: 356928
This commit is contained in:
Krasimir Georgiev 2019-03-25 17:29:16 +00:00
parent 7d3225c4b4
commit fc67176eec
2 changed files with 32 additions and 8 deletions
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16
clang/lib/Format/TokenAnnotator.cpp
View File

@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#include "TokenAnnotator.h"
#include "FormatToken.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Debug.h"
@ -440,10 +441,11 @@ private:
Contexts.back().InCSharpAttributeSpecifier;
bool InsideInlineASM = Line.startsWith(tok::kw_asm);
bool IsCppStructuredBinding = Left->isCppStructuredBinding(Style);
bool StartsObjCMethodExpr =
!InsideInlineASM && !CppArrayTemplates && Style.isCpp() &&
!IsCpp11AttributeSpecifier && Contexts.back().CanBeExpression &&
Left->isNot(TT_LambdaLSquare) &&
!IsCppStructuredBinding && !InsideInlineASM && !CppArrayTemplates &&
Style.isCpp() && !IsCpp11AttributeSpecifier &&
Contexts.back().CanBeExpression && Left->isNot(TT_LambdaLSquare) &&
!CurrentToken->isOneOf(tok::l_brace, tok::r_square) &&
(!Parent ||
Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
@ -451,14 +453,12 @@ private:
Parent->isUnaryOperator() ||
// FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
// for (auto && [A,B] : C) && structure binding seen as ObjCMethodExpr
(Parent->isNot(tok::ampamp) &&
getBinOpPrecedence(Parent->Tok.getKind(), true, true) >
prec::Unknown));
(getBinOpPrecedence(Parent->Tok.getKind(), true, true) >
prec::Unknown));
bool ColonFound = false;
unsigned BindingIncrease = 1;
if (Left->isCppStructuredBinding(Style)) {
if (IsCppStructuredBinding) {
Left->Type = TT_StructuredBindingLSquare;
} else if (Left->is(TT_Unknown)) {
if (StartsObjCMethodExpr) {

24
clang/unittests/Format/FormatTestObjC.cpp
View File

@ -1357,6 +1357,30 @@ TEST_F(FormatTestObjC, DisambiguatesCallsFromCppLambdas) {
// verifyFormat("x = ([a foo:bar] >> b->c == 'd');");
}
TEST_F(FormatTestObjC, DisambiguatesCallsFromStructuredBindings) {
verifyFormat("int f() {\n"
" if (a && [f arg])\n"
" return 0;\n"
"}");
verifyFormat("int f() {\n"
" if (a & [f arg])\n"
" return 0;\n"
"}");
verifyFormat("int f() {\n"
" for (auto &[elem] : list)\n"
" return 0;\n"
"}");
verifyFormat("int f() {\n"
" for (auto &&[elem] : list)\n"
" return 0;\n"
"}");
verifyFormat(
"int f() {\n"
" for (auto /**/ const /**/ volatile /**/ && /**/ [elem] : list)\n"
" return 0;\n"
"}");
}
} // end namespace
} // end namespace format
} // end namespace clang