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Abstract common parsing functionality

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This commit is contained in:
Carlo Nucera 2020-07-02 11:29:33 -04:00
parent 36cbc74689
commit ea48e3a5b5
2 changed files with 25 additions and 34 deletions
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37
src/libutil/hash.cc
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@ -147,22 +147,7 @@ Hash Hash::parseSRI(std::string_view original) {
Hash Hash::parseAnyPrefixed(std::string_view original)
{
auto rest = original;
bool isSRI = false;
// Parse the has type before the separater, if there was one.
std::optional<HashType> optParsedType;
{
auto hashRaw = splitPrefix(rest, ':');
if (!hashRaw) {
hashRaw = splitPrefix(rest, '-');
if (hashRaw)
isSRI = true;
}
if (hashRaw)
optParsedType = parseHashType(*hashRaw);
}
auto [optParsedType, isSRI] = getParsedTypeAndSRI(rest);
// Either the string or user must provide the type, if they both do they
// must agree.
@ -175,23 +160,7 @@ Hash Hash::parseAnyPrefixed(std::string_view original)
Hash Hash::parseAny(std::string_view original, std::optional<HashType> optType)
{
auto rest = original;
bool isSRI = false;
HashType hashType;
// Parse the has type before the separater, if there was one.
std::optional<HashType> optParsedType;
{
auto hashRaw = splitPrefix(rest, ':');
if (!hashRaw) {
hashRaw = splitPrefix(rest, '-');
if (hashRaw)
isSRI = true;
}
if (hashRaw)
optParsedType = parseHashType(*hashRaw);
}
auto [optParsedType, isSRI] = getParsedTypeAndSRI(rest);
// Either the string or user must provide the type, if they both do they
// must agree.
@ -200,7 +169,7 @@ Hash Hash::parseAny(std::string_view original, std::optional<HashType> optType)
else if (optParsedType && optType && *optParsedType != *optType)
throw BadHash("hash '%s' should have type '%s'", original, printHashType(*optType));
hashType = optParsedType ? *optParsedType : *optType;
HashType hashType = optParsedType ? *optParsedType : *optType;
return Hash(rest, hashType, isSRI);
}

22
src/libutil/parser.hh
View file

@ -21,4 +21,26 @@ static inline std::optional<std::string_view> splitPrefix(std::string_view & str
return std::nullopt;
}
// Mutates the string to eliminate the prefixes when found
std::pair<std::optional<HashType>, bool> getParsedTypeAndSRI(std::string_view & rest) {
bool isSRI = false;
// Parse the has type before the separater, if there was one.
std::optional<HashType> optParsedType;
{
auto hashRaw = splitPrefix(rest, ':');
if (!hashRaw) {
hashRaw = splitPrefix(rest, '-');
if (hashRaw)
isSRI = true;
}
if (hashRaw)
optParsedType = parseHashType(*hashRaw);
}
return std::make_pair(optParsedType, isSRI);
}
}