jrmolin created this revision.
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jrmolin requested review of this revision.
Herald added a project: clang.
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Add the definition, documentation, and implementation for a new clang-format
option.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D125171
Files:
clang/docs/ClangFormatStyleOptions.rst
clang/include/clang/Format/Format.h
clang/lib/Format/ContinuationIndenter.cpp
clang/lib/Format/Format.cpp
clang/lib/Format/TokenAnnotator.cpp
Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -4042,6 +4042,18 @@
return true;
}
+ // If AlwaysBreakBeforeFunctionParameters is true, we want to break before
+ // the next parameter, if there is one.
+ if (Left.is(tok::l_paren) && Style.AlwaysBreakBeforeFunctionParameters &&
+ !Right.is(tok::r_paren)) {
+ if (Left.Previous) {
+ const FormatToken &TwoPrevious = *Left.Previous;
+ if (TwoPrevious.is(TT_FunctionDeclarationName)) {
+ return true;
+ }
+ }
+ }
+
// If the last token before a '}', ']', or ')' is a comma or a trailing
// comment, the intention is to insert a line break after it in order to make
// shuffling around entries easier. Import statements, especially in
Index: clang/lib/Format/Format.cpp
===================================================================
--- clang/lib/Format/Format.cpp
+++ clang/lib/Format/Format.cpp
@@ -685,6 +685,8 @@
IO.mapOptional("AlwaysBreakBeforeMultilineStrings",
Style.AlwaysBreakBeforeMultilineStrings);
+ IO.mapOptional("AlwaysBreakBeforeFunctionParameters",
+ Style.AlwaysBreakBeforeFunctionParameters);
IO.mapOptional("AlwaysBreakTemplateDeclarations",
Style.AlwaysBreakTemplateDeclarations);
IO.mapOptional("AttributeMacros", Style.AttributeMacros);
@@ -1367,6 +1369,7 @@
FormatStyle::SIS_WithoutElse;
GoogleStyle.AllowShortLoopsOnASingleLine = true;
GoogleStyle.AlwaysBreakBeforeMultilineStrings = true;
+ GoogleStyle.AlwaysBreakBeforeFunctionParameters = false;
GoogleStyle.AlwaysBreakTemplateDeclarations = FormatStyle::BTDS_Yes;
GoogleStyle.DerivePointerAlignment = true;
GoogleStyle.IncludeStyle.IncludeCategories = {{"^<ext/.*\\.h>", 2, 0, false},
@@ -1438,6 +1441,7 @@
GoogleStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_Empty;
GoogleStyle.AllowShortIfStatementsOnASingleLine = FormatStyle::SIS_Never;
GoogleStyle.AlwaysBreakBeforeMultilineStrings = false;
+ GoogleStyle.AlwaysBreakBeforeFunctionParameters = false;
GoogleStyle.BreakBeforeBinaryOperators = FormatStyle::BOS_NonAssignment;
GoogleStyle.ColumnLimit = 100;
GoogleStyle.SpaceAfterCStyleCast = true;
@@ -1449,6 +1453,7 @@
// TODO: still under discussion whether to switch to SLS_All.
GoogleStyle.AllowShortLambdasOnASingleLine = FormatStyle::SLS_Empty;
GoogleStyle.AlwaysBreakBeforeMultilineStrings = false;
+ GoogleStyle.AlwaysBreakBeforeFunctionParameters = false;
GoogleStyle.BreakBeforeTernaryOperators = false;
// taze:, triple slash directives (`/// <...`), tslint:, and @see, which is
// commonly followed by overlong URLs.
Index: clang/lib/Format/ContinuationIndenter.cpp
===================================================================
--- clang/lib/Format/ContinuationIndenter.cpp
+++ clang/lib/Format/ContinuationIndenter.cpp
@@ -335,6 +335,11 @@
auto LambdaBodyLength = getLengthToMatchingParen(Current, State.Stack);
return LambdaBodyLength > getColumnLimit(State);
}
+ // Check if we want to break before function parameters in declarations
+ if (startsNextParameter(Current, Style) &&
+ Style.AlwaysBreakBeforeFunctionParameters &&
+ State.Line->MustBeDeclaration)
+ return true;
if (Current.MustBreakBefore || Current.is(TT_InlineASMColon))
return true;
if (CurrentState.BreakBeforeClosingBrace &&
@@ -983,7 +988,9 @@
// If we are breaking after '(', '{', '<', or this is the break after a ':'
// to start a member initializater list in a constructor, this should not
// be considered bin packing unless the relevant AllowAll option is false or
- // this is a dict/object literal.
+ // this is a dict/object literal. Break if
+ // AlwaysBreakBeforeFunctionParameters is true and it's a function
+ // declaration.
bool PreviousIsBreakingCtorInitializerColon =
Previous.is(TT_CtorInitializerColon) &&
Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
@@ -995,7 +1002,9 @@
!State.Line->MustBeDeclaration) ||
(Style.PackConstructorInitializers != FormatStyle::PCIS_NextLine &&
PreviousIsBreakingCtorInitializerColon) ||
- Previous.is(TT_DictLiteral))
+ Previous.is(TT_DictLiteral) ||
+ (Style.AlwaysBreakBeforeFunctionParameters &&
+ State.Line->MustBeDeclaration))
CurrentState.BreakBeforeParameter = true;
// If we are breaking after a ':' to start a member initializer list,
Index: clang/include/clang/Format/Format.h
===================================================================
--- clang/include/clang/Format/Format.h
+++ clang/include/clang/Format/Format.h
@@ -749,6 +749,14 @@
/// \version 3.4
bool AlwaysBreakBeforeMultilineStrings;
+ /// \brief Always break before function parameters in a declaration, e.g.:
+ /// \code
+ /// someFunction(
+ /// int argument1,
+ /// int argument2);
+ /// \endcode
+ bool AlwaysBreakBeforeFunctionParameters;
+
/// Different ways to break after the template declaration.
enum BreakTemplateDeclarationsStyle : int8_t {
/// Do not force break before declaration.
Index: clang/docs/ClangFormatStyleOptions.rst
===================================================================
--- clang/docs/ClangFormatStyleOptions.rst
+++ clang/docs/ClangFormatStyleOptions.rst
@@ -1241,6 +1241,21 @@
+**AlwaysBreakBeforeFunctionParameters** (``Boolean``) :versionbadge:`clang-format 15.0`
+ If ``true``, always break before function parameters.
+
+ This flag is meant to align function parameters starting on the line following
+ a function declaration or definition. Thus, it will only take effect if a function
+ declares a parameter (or multiple parameters).
+
+ .. code-block:: c++
+
+ true: false:
+ int vs. int
+ add_two_numbers( add_two_numbers(int a,
+ int a, int b);
+ int b);
+
**AlwaysBreakBeforeMultilineStrings** (``Boolean``) :versionbadge:`clang-format 3.4`
If ``true``, always break before multiline string literals.
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