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#include "trim_indent.h"
#include <util/generic/algorithm.h>
#include <util/generic/string.h>
#include <util/generic/vector.h>
#include <util/string/ascii.h>
#include <util/string/builder.h>
#include <util/string/join.h>
#include <util/string/split.h>
#include <ranges>
namespace NYql {
namespace {
constexpr auto IndentWidth = [](TStringBuf line) -> size_t {
auto it = FindIf(line, [](char x) { return x != ' '; });
if (it == end(line)) {
return line.size();
}
return std::distance(begin(line), it);
};
constexpr auto IsNotBlank = [](TStringBuf line) -> bool {
return !AllOf(line, [](char x) { return x == ' '; });
};
bool IsBlank(TStringBuf line) {
return !IsNotBlank(line);
}
} // namespace
TString TrimIndent(TStringBuf input) {
TVector<TStringBuf> lines;
TSetDelimiter<const char> delim("\n");
TContainerConsumer<TVector<TStringBuf>> consumer(&lines);
SplitString(begin(input), end(input), delim, consumer);
auto indents =
lines |
std::ranges::views::filter(IsNotBlank) |
std::ranges::views::transform(IndentWidth);
size_t minIndent = 0;
if (!std::ranges::empty(indents)) {
minIndent = std::ranges::min(indents);
}
for (TStringBuf& line : lines) {
line.Skip(minIndent);
}
if (!lines.empty() && IsBlank(lines.front())) {
lines.erase(begin(lines));
}
if (!lines.empty() && IsBlank(lines.back())) {
lines.pop_back();
}
return JoinSeq('\n', lines);
}
} // namespace NYql
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