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Overload the ‘+’ operator to support integer addition
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3 changed files with 23 additions and 15 deletions
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@ -968,31 +968,39 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
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{
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PathSet context;
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std::ostringstream s;
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int n = 0;
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bool first = true, isPath = false;
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Value vStr;
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bool first = true;
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ValueType firstType;
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foreach (vector<Expr *>::iterator, i, *es) {
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(*i)->eval(state, env, vStr);
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Value vTmp;
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(*i)->eval(state, env, vTmp);
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/* If the first element is a path, then the result will also
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be a path, we don't copy anything (yet - that's done later,
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since paths are copied when they are used in a derivation),
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and none of the strings are allowed to have contexts. */
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if (first) {
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isPath = !forceString && vStr.type == tPath;
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firstType = vTmp.type;
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first = false;
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}
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s << state.coerceToString(vStr, context, false, !isPath);
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if (firstType == tInt && !forceString) {
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if (vTmp.type != tInt)
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throwEvalError("cannot add %1% to an integer", showType(vTmp));
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n += vTmp.integer;
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} else
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s << state.coerceToString(vTmp, context, false, firstType != tPath);
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}
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if (isPath && !context.empty())
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if (firstType == tInt)
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mkInt(v, n);
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else if (firstType == tPath) {
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if (!context.empty())
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throwEvalError("a string that refers to a store path cannot be appended to a path, in `%1%'", s.str());
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if (isPath)
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mkPath(v, s.str().c_str());
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else
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} else
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mkString(v, s.str(), context);
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}
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@ -1 +1 @@
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1275
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1854
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@ -16,6 +16,6 @@ let {
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range = range_ [];
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*/
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body = sum (range 1 50);
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body = sum (range 1 50) + 123 + 456;
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}
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