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Improved formatting of lambda expressions [#METR-23947].

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This commit is contained in:
Alexey Milovidov 2017-01-12 04:55:14 +03:00
parent 38c9ad9761
commit 916552f175
1 changed files with 25 additions and 0 deletions
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25
dbms/src/Parsers/ASTFunction.cpp
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@ -175,6 +175,31 @@ void ASTFunction::formatImplWithoutAlias(const FormatSettings & settings, Format
arguments->children[1]->formatImpl(settings, state, nested_need_parens);
written = true;
}
if (!written && 0 == strcmp(name.c_str(), "lambda"))
{
/// Special case: one-element tuple in lhs of lambda is printed as its element.
if (frame.need_parens)
settings.ostr << '(';
const ASTFunction * first_arg_func = typeid_cast<const ASTFunction *>(arguments->children[0].get());
if (first_arg_func
&& first_arg_func->name == "tuple"
&& first_arg_func->arguments
&& first_arg_func->arguments->children.size() == 1)
{
first_arg_func->arguments->children[0]->formatImpl(settings, state, nested_need_parens);
}
else
arguments->children[0]->formatImpl(settings, state, nested_need_parens);
settings.ostr << (settings.hilite ? hilite_operator : "") << " -> " << (settings.hilite ? hilite_none : "");
arguments->children[1]->formatImpl(settings, state, nested_need_parens);
if (frame.need_parens)
settings.ostr << ')';
written = true;
}
}
if (!written && arguments->children.size() >= 2)