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builtins.match: Improve error message for bad regular expression

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Issue #1331.
This commit is contained in:
Eelco Dolstra 2017-05-17 11:58:01 +02:00
parent b01d62285c
commit e46090edb1
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1 changed files with 23 additions and 16 deletions
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39
src/libexpr/primops.cc
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@ -1709,26 +1709,33 @@ static void prim_hashString(EvalState & state, const Pos & pos, Value * * args,
‘null’ or a list containing substring matches. */
static void prim_match(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
std::regex regex(state.forceStringNoCtx(*args[0], pos), std::regex::extended);
auto re = state.forceStringNoCtx(*args[0], pos);
PathSet context;
const std::string str = state.forceString(*args[1], context, pos);
try {
std::regex regex(re, std::regex::extended);
std::smatch match;
if (!std::regex_match(str, match, regex)) {
mkNull(v);
return;
}
PathSet context;
const std::string str = state.forceString(*args[1], context, pos);
// the first match is the whole string
const size_t len = match.size() - 1;
state.mkList(v, len);
for (size_t i = 0; i < len; ++i) {
if (!match[i+1].matched)
mkNull(*(v.listElems()[i] = state.allocValue()));
else
mkString(*(v.listElems()[i] = state.allocValue()), match[i + 1].str().c_str());
std::smatch match;
if (!std::regex_match(str, match, regex)) {
mkNull(v);
return;
}
// the first match is the whole string
const size_t len = match.size() - 1;
state.mkList(v, len);
for (size_t i = 0; i < len; ++i) {
if (!match[i+1].matched)
mkNull(*(v.listElems()[i] = state.allocValue()));
else
mkString(*(v.listElems()[i] = state.allocValue()), match[i + 1].str().c_str());
}
} catch (std::regex_error &) {
throw EvalError("invalid regular expression ‘%s’, at %s", re, pos);
}
}