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string2Int(): Return std::optional

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This commit is contained in:
Eelco Dolstra 2021-01-08 12:22:21 +01:00
parent 29a445840a
commit 6548b89cc4
17 changed files with 82 additions and 69 deletions
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14
src/libexpr/attr-path.cc
View file

@ -52,9 +52,7 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attr
for (auto & attr : tokens) {
/* Is i an index (integer) or a normal attribute name? */
enum { apAttr, apIndex } apType = apAttr;
unsigned int attrIndex;
if (string2Int(attr, attrIndex)) apType = apIndex;
auto attrIndex = string2Int<unsigned int>(attr);
/* Evaluate the expression. */
Value * vNew = state.allocValue();
@ -65,7 +63,7 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attr
/* It should evaluate to either a set or an expression,
according to what is specified in the attrPath. */
if (apType == apAttr) {
if (!attrIndex) {
if (v->type() != nAttrs)
throw TypeError(
@ -82,17 +80,17 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attr
pos = *a->pos;
}
else if (apType == apIndex) {
else {
if (!v->isList())
throw TypeError(
"the expression selected by the selection path '%1%' should be a list but is %2%",
attrPath,
showType(*v));
if (attrIndex >= v->listSize())
throw AttrPathNotFound("list index %1% in selection path '%2%' is out of range", attrIndex, attrPath);
if (*attrIndex >= v->listSize())
throw AttrPathNotFound("list index %1% in selection path '%2%' is out of range", *attrIndex, attrPath);
v = v->listElems()[attrIndex];
v = v->listElems()[*attrIndex];
pos = noPos;
}

8
src/libexpr/get-drvs.cc
View file

@ -214,8 +214,8 @@ NixInt DrvInfo::queryMetaInt(const string & name, NixInt def)
if (v->type() == nString) {
/* Backwards compatibility with before we had support for
integer meta fields. */
NixInt n;
if (string2Int(v->string.s, n)) return n;
if (auto n = string2Int<NixInt>(v->string.s))
return *n;
}
return def;
}
@ -228,8 +228,8 @@ NixFloat DrvInfo::queryMetaFloat(const string & name, NixFloat def)
if (v->type() == nString) {
/* Backwards compatibility with before we had support for
float meta fields. */
NixFloat n;
if (string2Float(v->string.s, n)) return n;
if (auto n = string2Float<NixFloat>(v->string.s))
return *n;
}
return def;
}

6
src/libfetchers/path.cc
View file

@ -20,10 +20,10 @@ struct PathInputScheme : InputScheme
if (name == "rev" || name == "narHash")
input.attrs.insert_or_assign(name, value);
else if (name == "revCount" || name == "lastModified") {
uint64_t n;
if (!string2Int(value, n))
if (auto n = string2Int<uint64_t>(value))
input.attrs.insert_or_assign(name, *n);
else
throw Error("path URL '%s' has invalid parameter '%s'", url.to_string(), name);
input.attrs.insert_or_assign(name, n);
}
else
throw Error("path URL '%s' has unsupported parameter '%s'", url.to_string(), name);

6
src/libmain/shared.cc
View file

@ -219,10 +219,10 @@ LegacyArgs::LegacyArgs(const std::string & programName,
.description = description,
.labels = {"n"},
.handler = {[=](std::string s) {
unsigned int n;
if (!string2Int(s, n))
if (auto n = string2Int<unsigned int>(s))
settings.set(dest, std::to_string(*n));
else
throw UsageError("'%s' is not an integer", s);
settings.set(dest, std::to_string(n));
}}
});
};

5
src/libmain/shared.hh
View file

@ -70,10 +70,9 @@ template<class N> N getIntArg(const string & opt,
s.resize(s.size() - 1);
}
}
N n;
if (!string2Int(s, n))
if (auto n = string2Int<N>(s))
return *n * multiplier;
throw UsageError("'%1%' requires an integer argument", opt);
return n * multiplier;
}

4
src/libstore/build/derivation-goal.cc
View file

@ -1699,12 +1699,10 @@ void DerivationGoal::startBuilder()
userNamespaceSync.writeSide = -1;
});
pid_t tmp;
auto ss = tokenizeString<std::vector<std::string>>(readLine(builderOut.readSide.get()));
assert(ss.size() == 2);
usingUserNamespace = ss[0] == "1";
if (!string2Int<pid_t>(ss[1], tmp)) abort();
pid = tmp;
pid = string2Int<pid_t>(ss[1]).value();
if (usingUserNamespace) {
/* Set the UID/GID mapping of the builder's user namespace

6
src/libstore/globals.cc
View file

@ -228,8 +228,12 @@ template<> void BaseSetting<SandboxMode>::convertToArg(Args & args, const std::s
void MaxBuildJobsSetting::set(const std::string & str, bool append)
{
if (str == "auto") value = std::max(1U, std::thread::hardware_concurrency());
else if (!string2Int(str, value))
else {
if (auto n = string2Int<decltype(value)>(str))
value = *n;
else
throw UsageError("configuration setting '%s' should be 'auto' or an integer", name);
}
}

4
src/libstore/local-store.cc
View file

@ -66,8 +66,10 @@ int getSchema(Path schemaPath)
int curSchema = 0;
if (pathExists(schemaPath)) {
string s = readFile(schemaPath);
if (!string2Int(s, curSchema))
auto n = string2Int<int>(s);
if (!n)
throw Error("'%1%' is corrupt", schemaPath);
curSchema = *n;
}
return curSchema;
}

12
src/libstore/names.cc
View file

@ -80,16 +80,16 @@ string nextComponent(string::const_iterator & p,
static bool componentsLT(const string & c1, const string & c2)
{
int n1, n2;
bool c1Num = string2Int(c1, n1), c2Num = string2Int(c2, n2);
auto n1 = string2Int<int>(c1);
auto n2 = string2Int<int>(c2);
if (c1Num && c2Num) return n1 < n2;
else if (c1 == "" && c2Num) return true;
if (n1 && n2) return *n1 < *n2;
else if (c1 == "" && n2) return true;
else if (c1 == "pre" && c2 != "pre") return true;
else if (c2 == "pre") return false;
/* Assume that `2.3a' < `2.3.1'. */
else if (c2Num) return true;
else if (c1Num) return false;
else if (n2) return true;
else if (n1) return false;
else return c1 < c2;
}

8
src/libstore/nar-info.cc
View file

@ -46,14 +46,18 @@ NarInfo::NarInfo(const Store & store, const std::string & s, const std::string &
else if (name == "FileHash")
fileHash = parseHashField(value);
else if (name == "FileSize") {
if (!string2Int(value, fileSize)) throw corrupt();
auto n = string2Int<decltype(fileSize)>(value);
if (!n) throw corrupt();
fileSize = *n;
}
else if (name == "NarHash") {
narHash = parseHashField(value);
haveNarHash = true;
}
else if (name == "NarSize") {
if (!string2Int(value, narSize)) throw corrupt();
auto n = string2Int<decltype(narSize)>(value);
if (!n) throw corrupt();
narSize = *n;
}
else if (name == "References") {
auto refs = tokenizeString<Strings>(value, " ");

11
src/libstore/profiles.cc
View file

@ -21,9 +21,8 @@ static std::optional<GenerationNumber> parseName(const string & profileName, con
string s = string(name, profileName.size() + 1);
string::size_type p = s.find("-link");
if (p == string::npos) return {};
unsigned int n;
if (string2Int(string(s, 0, p), n) && n >= 0)
return n;
if (auto n = string2Int<unsigned int>(s.substr(0, p)))
return *n;
else
return {};
}
@ -214,12 +213,12 @@ void deleteGenerationsOlderThan(const Path & profile, const string & timeSpec, b
{
time_t curTime = time(0);
string strDays = string(timeSpec, 0, timeSpec.size() - 1);
int days;
auto days = string2Int<int>(strDays);
if (!string2Int(strDays, days) || days < 1)
if (!days || *days < 1)
throw Error("invalid number of days specifier '%1%'", timeSpec);
time_t oldTime = curTime - days * 24 * 3600;
time_t oldTime = curTime - *days * 24 * 3600;
deleteGenerationsOlderThan(profile, oldTime, dryRun);
}

13
src/libstore/store-api.cc
View file

@ -932,19 +932,20 @@ std::optional<ValidPathInfo> decodeValidPathInfo(const Store & store, std::istre
getline(str, s);
auto narHash = Hash::parseAny(s, htSHA256);
getline(str, s);
uint64_t narSize;
if (!string2Int(s, narSize)) throw Error("number expected");
hashGiven = { narHash, narSize };
auto narSize = string2Int<uint64_t>(s);
if (!narSize) throw Error("number expected");
hashGiven = { narHash, *narSize };
}
ValidPathInfo info(store.parseStorePath(path), hashGiven->first);
info.narSize = hashGiven->second;
std::string deriver;
getline(str, deriver);
if (deriver != "") info.deriver = store.parseStorePath(deriver);
string s; int n;
string s;
getline(str, s);
if (!string2Int(s, n)) throw Error("number expected");
while (n--) {
auto n = string2Int<int>(s);
if (!n) throw Error("number expected");
while ((*n)--) {
getline(str, s);
info.references.insert(store.parseStorePath(s));
}

4
src/libutil/args.hh
View file

@ -87,7 +87,9 @@ protected:
template<class I>
Handler(I * dest)
: fun([=](std::vector<std::string> ss) {
if (!string2Int(ss[0], *dest))
if (auto n = string2Int<I>(ss[0]))
*dest = *n;
else
throw UsageError("'%s' is not an integer", ss[0]);
})
, arity(1)

4
src/libutil/config.cc
View file

@ -230,7 +230,9 @@ template<typename T>
void BaseSetting<T>::set(const std::string & str, bool append)
{
static_assert(std::is_integral<T>::value, "Integer required.");
if (!string2Int(str, value))
if (auto n = string2Int<T>(str))
value = *n;
else
throw UsageError("setting '%s' has invalid value '%s'", name, str);
}

18
src/libutil/util.hh
View file

@ -397,21 +397,27 @@ bool statusOk(int status);
/* Parse a string into an integer. */
template<class N> bool string2Int(const string & s, N & n)
template<class N>
std::optional<N> string2Int(const std::string & s)
{
if (string(s, 0, 1) == "-" && !std::numeric_limits<N>::is_signed)
return false;
if (s.substr(0, 1) == "-" && !std::numeric_limits<N>::is_signed)
return {};
std::istringstream str(s);
N n;
str >> n;
return str && str.get() == EOF;
if (str && str.get() == EOF) return n;
return {};
}
/* Parse a string into a float. */
template<class N> bool string2Float(const string & s, N & n)
template<class N>
std::optional<N> string2Float(const string & s)
{
std::istringstream str(s);
N n;
str >> n;
return str && str.get() == EOF;
if (str && str.get() == EOF) return n;
return {};
}

19
src/nix-env/nix-env.cc
View file

@ -1250,11 +1250,10 @@ static void opSwitchGeneration(Globals & globals, Strings opFlags, Strings opArg
if (opArgs.size() != 1)
throw UsageError("exactly one argument expected");
GenerationNumber dstGen;
if (!string2Int(opArgs.front(), dstGen))
if (auto dstGen = string2Int<GenerationNumber>(opArgs.front()))
switchGeneration(globals, *dstGen);
else
throw UsageError("expected a generation number");
switchGeneration(globals, dstGen);
}
@ -1308,17 +1307,17 @@ static void opDeleteGenerations(Globals & globals, Strings opFlags, Strings opAr
if(opArgs.front().size() < 2)
throw Error("invalid number of generations ‘%1%’", opArgs.front());
string str_max = string(opArgs.front(), 1, opArgs.front().size());
GenerationNumber max;
if (!string2Int(str_max, max) || max == 0)
auto max = string2Int<GenerationNumber>(str_max);
if (!max || *max == 0)
throw Error("invalid number of generations to keep ‘%1%’", opArgs.front());
deleteGenerationsGreaterThan(globals.profile, max, globals.dryRun);
deleteGenerationsGreaterThan(globals.profile, *max, globals.dryRun);
} else {
std::set<GenerationNumber> gens;
for (auto & i : opArgs) {
GenerationNumber n;
if (!string2Int(i, n))
if (auto n = string2Int<GenerationNumber>(i))
gens.insert(*n);
else
throw UsageError("invalid generation number '%1%'", i);
gens.insert(n);
}
deleteGenerations(globals.profile, gens, globals.dryRun);
}

5
src/nix/profile.cc
View file

@ -209,9 +209,8 @@ public:
std::vector<Matcher> res;
for (auto & s : _matchers) {
size_t n;
if (string2Int(s, n))
res.push_back(n);
if (auto n = string2Int<size_t>(s))
res.push_back(*n);
else if (store->isStorePath(s))
res.push_back(s);
else