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Factor the prefix splitting in content-address

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This commit is contained in:
Carlo Nucera 2020-06-30 11:57:46 -04:00
parent 7ba0fae0dd
commit 77b51f4598
1 changed files with 12 additions and 15 deletions
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27
src/libstore/content-address.cc
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@ -1,5 +1,6 @@
#include "args.hh"
#include "content-address.hh"
#include "parser.hh"
namespace nix {
@ -43,23 +44,19 @@ std::string renderContentAddress(ContentAddress ca) {
ContentAddress parseContentAddress(std::string_view rawCa) {
auto rest = rawCa;
// Ensure prefix
const auto prefixSeparator = rawCa.find(':');
if (prefixSeparator == string::npos)
throw UsageError("not a content address because it is not in the form \"<prefix>:<rest>\": %s", rawCa);
auto prefix = rest.substr(0, prefixSeparator);
rest = rest.substr(prefixSeparator + 1);
std::string_view prefix;
{
auto optPrefix = splitPrefix(rest, ':');
if (!optPrefix)
throw UsageError("not a content address because it is not in the form \"<prefix>:<rest>\": %s", rawCa);
prefix = *optPrefix;
}
auto parseHashType_ = [&](){
// Parse hash type
auto algoSeparator = rest.find(':');
HashType hashType;
if (algoSeparator == string::npos)
throw UsageError("content address hash must be in form \"<algo>:<hash>\", but found: %s", rest);
hashType = parseHashType(rest.substr(0, algoSeparator));
rest = rest.substr(algoSeparator + 1);
auto hashTypeRaw = splitPrefix(rest, ':');
if (!hashTypeRaw)
throw UsageError("content address hash must be in form \"<algo>:<hash>\", but found: %s", rawCa);
HashType hashType = parseHashType(*hashTypeRaw);
return std::move(hashType);
};