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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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11
src/libexpr/primops.cc
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@ -1709,12 +1709,15 @@ static void prim_hashString(EvalState & state, const Pos & pos, Value * * args,
‘null’ or a list containing substring matches. */ ‘null’ or a list containing substring matches. */
static void prim_match(EvalState & state, const Pos & pos, Value * * args, Value & v) 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);
try {
std::regex regex(re, std::regex::extended);
PathSet context; PathSet context;
const std::string str = state.forceString(*args[1], context, pos); const std::string str = state.forceString(*args[1], context, pos);
std::smatch match; std::smatch match;
if (!std::regex_match(str, match, regex)) { if (!std::regex_match(str, match, regex)) {
mkNull(v); mkNull(v);
@ -1730,6 +1733,10 @@ static void prim_match(EvalState & state, const Pos & pos, Value * * args, Value
else else
mkString(*(v.listElems()[i] = state.allocValue()), match[i + 1].str().c_str()); 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);
}
} }