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e4f62e4608
* It is tough to contribute to a project that doesn't use a formatter, * It is extra hard to contribute to a project which has configured the formatter, but ignores it for some files * Code formatting makes it harder to hide obscure / weird bugs by accident or on purpose, Let's rip the bandaid off? Note that PRs currently in flight should be able to be merged relatively easily by applying `clang-format` to their tip prior to merge.
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
#include "nix/util/pos-table.hh"
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#include <algorithm>
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namespace nix {
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/* Position table. */
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Pos PosTable::operator[](PosIdx p) const
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{
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auto origin = resolve(p);
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if (!origin)
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return {};
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const auto offset = origin->offsetOf(p);
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Pos result{0, 0, origin->origin};
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auto linesCache = this->linesCache.lock();
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/* Try the origin's line cache */
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const auto * linesForInput = linesCache->getOrNullptr(origin->offset);
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auto fillCacheForOrigin = [](std::string_view content) {
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auto contentLines = Lines();
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const char * begin = content.data();
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for (Pos::LinesIterator it(content), end; it != end; it++)
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contentLines.push_back(it->data() - begin);
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if (contentLines.empty())
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contentLines.push_back(0);
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return contentLines;
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};
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/* Calculate line offsets and fill the cache */
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if (!linesForInput) {
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auto originContent = result.getSource().value_or("");
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linesCache->upsert(origin->offset, fillCacheForOrigin(originContent));
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linesForInput = linesCache->getOrNullptr(origin->offset);
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}
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assert(linesForInput);
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// as above: the first line starts at byte 0 and is always present
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auto lineStartOffset = std::prev(std::upper_bound(linesForInput->begin(), linesForInput->end(), offset));
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result.line = 1 + (lineStartOffset - linesForInput->begin());
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result.column = 1 + (offset - *lineStartOffset);
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return result;
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}
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} // namespace nix
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