void CommaSeparatedList::precomputeFormattingInfos(const FormatToken *Token) {
// FIXME: At some point we might want to do this for other lists, too.
if (!Token->MatchingParen || Token->isNot(tok::l_brace))
return;
FormatToken *ItemBegin = Token->Next;
SmallVector<bool, 8> MustBreakBeforeItem;
// The lengths of an item if it is put at the end of the line. This includes
// trailing comments which are otherwise ignored for column alignment.
SmallVector<unsigned, 8> EndOfLineItemLength;
for (unsigned i = 0, e = Commas.size() + 1; i != e; ++i) {
// Skip comments on their own line.
while (ItemBegin->HasUnescapedNewline && ItemBegin->isTrailingComment())
ItemBegin = ItemBegin->Next;
MustBreakBeforeItem.push_back(ItemBegin->MustBreakBefore);
const FormatToken *ItemEnd = NULL;
if (i == Commas.size()) {
ItemEnd = Token->MatchingParen;
const FormatToken *NonCommentEnd = ItemEnd->getPreviousNonComment();
ItemLengths.push_back(CodePointsBetween(ItemBegin, NonCommentEnd));
if (Style.Cpp11BracedListStyle) {
// In Cpp11 braced list style, the } and possibly other subsequent
// tokens will need to stay on a line with the last element.
while (ItemEnd->Next && !ItemEnd->Next->CanBreakBefore)
ItemEnd = ItemEnd->Next;
} else {
// In other braced lists styles, the "}" can be wrapped to the new line.
ItemEnd = Token->MatchingParen->Previous;
}
} else {
ItemEnd = Commas[i];
// The comma is counted as part of the item when calculating the length.
ItemLengths.push_back(CodePointsBetween(ItemBegin, ItemEnd));
// Consume trailing comments so the are included in EndOfLineItemLength.
if (ItemEnd->Next && !ItemEnd->Next->HasUnescapedNewline &&
ItemEnd->Next->isTrailingComment())
ItemEnd = ItemEnd->Next;
}
EndOfLineItemLength.push_back(CodePointsBetween(ItemBegin, ItemEnd));
// If there is a trailing comma in the list, the next item will start at the
// closing brace. Don't create an extra item for this.
if (ItemEnd->getNextNonComment() == Token->MatchingParen)
break;
ItemBegin = ItemEnd->Next;
}
// We can never place more than ColumnLimit / 3 items in a row (because of the
// spaces and the comma).
for (unsigned Columns = 1; Columns <= Style.ColumnLimit / 3; ++Columns) {
ColumnFormat Format;
Format.Columns = Columns;
Format.ColumnSizes.resize(Columns);
Format.LineCount = 0;
bool HasRowWithSufficientColumns = false;
unsigned Column = 0;
for (unsigned i = 0, e = ItemLengths.size(); i != e; ++i) {
if (MustBreakBeforeItem[i] || Column == Columns) {
++Format.LineCount;
Column = 0;
}
if (Column == Columns - 1)
HasRowWithSufficientColumns = true;
unsigned length =
(Column == Columns - 1) ? EndOfLineItemLength[i] : ItemLengths[i];
Format.ColumnSizes[Column] =
std::max(Format.ColumnSizes[Column], length);
++Column;
}
// If all rows are terminated early (e.g. by trailing comments), we don't
// need to look further.
if (!HasRowWithSufficientColumns)
break;
Format.TotalWidth = Columns - 1; // Width of the N-1 spaces.
for (unsigned i = 0; i < Columns; ++i) {
Format.TotalWidth += Format.ColumnSizes[i];
}
// Ignore layouts that are bound to violate the column limit.
if (Format.TotalWidth > Style.ColumnLimit)
continue;
Formats.push_back(Format);
}
}
void CommaSeparatedList::precomputeFormattingInfos(const FormatToken *Token) {
// FIXME: At some point we might want to do this for other lists, too.
if (!Token->MatchingParen || Token->isNot(tok::l_brace))
return;
// In C++11 braced list style, we should not format in columns unless they
// have many items (20 or more) or we allow bin-packing of function call
// arguments.
if (Style.Cpp11BracedListStyle && !Style.BinPackArguments &&
Commas.size() < 19)
return;
// Column format doesn't really make sense if we don't align after brackets.
if (!Style.AlignAfterOpenBracket)
return;
FormatToken *ItemBegin = Token->Next;
while (ItemBegin->isTrailingComment())
ItemBegin = ItemBegin->Next;
SmallVector<bool, 8> MustBreakBeforeItem;
// The lengths of an item if it is put at the end of the line. This includes
// trailing comments which are otherwise ignored for column alignment.
SmallVector<unsigned, 8> EndOfLineItemLength;
bool HasSeparatingComment = false;
for (unsigned i = 0, e = Commas.size() + 1; i != e; ++i) {
// Skip comments on their own line.
while (ItemBegin->HasUnescapedNewline && ItemBegin->isTrailingComment()) {
ItemBegin = ItemBegin->Next;
HasSeparatingComment = i > 0;
}
MustBreakBeforeItem.push_back(ItemBegin->MustBreakBefore);
if (ItemBegin->is(tok::l_brace))
HasNestedBracedList = true;
const FormatToken *ItemEnd = nullptr;
if (i == Commas.size()) {
ItemEnd = Token->MatchingParen;
const FormatToken *NonCommentEnd = ItemEnd->getPreviousNonComment();
ItemLengths.push_back(CodePointsBetween(ItemBegin, NonCommentEnd));
if (Style.Cpp11BracedListStyle) {
// In Cpp11 braced list style, the } and possibly other subsequent
// tokens will need to stay on a line with the last element.
while (ItemEnd->Next && !ItemEnd->Next->CanBreakBefore)
ItemEnd = ItemEnd->Next;
} else {
// In other braced lists styles, the "}" can be wrapped to the new line.
ItemEnd = Token->MatchingParen->Previous;
}
} else {
ItemEnd = Commas[i];
// The comma is counted as part of the item when calculating the length.
ItemLengths.push_back(CodePointsBetween(ItemBegin, ItemEnd));
// Consume trailing comments so the are included in EndOfLineItemLength.
if (ItemEnd->Next && !ItemEnd->Next->HasUnescapedNewline &&
ItemEnd->Next->isTrailingComment())
ItemEnd = ItemEnd->Next;
}
EndOfLineItemLength.push_back(CodePointsBetween(ItemBegin, ItemEnd));
// If there is a trailing comma in the list, the next item will start at the
// closing brace. Don't create an extra item for this.
if (ItemEnd->getNextNonComment() == Token->MatchingParen)
break;
ItemBegin = ItemEnd->Next;
}
// Don't use column layout for nested lists, lists with few elements and in
// presence of separating comments.
if (Token->NestingLevel != 0 || Commas.size() < 5 || HasSeparatingComment)
return;
// We can never place more than ColumnLimit / 3 items in a row (because of the
// spaces and the comma).
unsigned MaxItems = Style.ColumnLimit / 3;
std::vector<unsigned> MinSizeInColumn;
MinSizeInColumn.reserve(MaxItems);
for (unsigned Columns = 1; Columns <= MaxItems; ++Columns) {
ColumnFormat Format;
Format.Columns = Columns;
Format.ColumnSizes.resize(Columns);
MinSizeInColumn.assign(Columns, UINT_MAX);
Format.LineCount = 1;
bool HasRowWithSufficientColumns = false;
unsigned Column = 0;
for (unsigned i = 0, e = ItemLengths.size(); i != e; ++i) {
assert(i < MustBreakBeforeItem.size());
if (MustBreakBeforeItem[i] || Column == Columns) {
++Format.LineCount;
Column = 0;
}
if (Column == Columns - 1)
HasRowWithSufficientColumns = true;
unsigned Length =
(Column == Columns - 1) ? EndOfLineItemLength[i] : ItemLengths[i];
Format.ColumnSizes[Column] = std::max(Format.ColumnSizes[Column], Length);
MinSizeInColumn[Column] = std::min(MinSizeInColumn[Column], Length);
++Column;
}
// If all rows are terminated early (e.g. by trailing comments), we don't
// need to look further.
if (!HasRowWithSufficientColumns)
break;
Format.TotalWidth = Columns - 1; // Width of the N-1 spaces.
for (unsigned i = 0; i < Columns; ++i)
Format.TotalWidth += Format.ColumnSizes[i];
// Don't use this Format, if the difference between the longest and shortest
// element in a column exceeds a threshold to avoid excessive spaces.
if ([&] {
for (unsigned i = 0; i < Columns - 1; ++i)
if (Format.ColumnSizes[i] - MinSizeInColumn[i] > 10)
return true;
return false;
}())
continue;
// Ignore layouts that are bound to violate the column limit.
if (Format.TotalWidth > Style.ColumnLimit)
continue;
Formats.push_back(Format);
}
}