diff options
| -rw-r--r-- | src/libexpr/eval-test.cc | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/libexpr/eval-test.cc b/src/libexpr/eval-test.cc index 983cac9515fe..543a9cf85298 100644 --- a/src/libexpr/eval-test.cc +++ b/src/libexpr/eval-test.cc @@ -125,6 +125,9 @@ std::ostream & operator << (std::ostream & str, Value & v) case tString: str << "\"" << v.string.s << "\""; // !!! escaping break; + case tNull: + str << "true"; + break; case tAttrs: str << "{ "; foreach (Bindings::iterator, i, *v.attrs) @@ -308,6 +311,16 @@ static Env & allocEnv() char * p1 = 0, * p2 = 0; +static bool evalBool(Env & env, Expr e) +{ + Value v; + eval(env, e, v); + if (v.type != tBool) + throw TypeError(format("value is %1% while a Boolean was expected") % showType(v)); + return v.boolean; +} + + static void eval(Env & env, Expr e, Value & v) { char c; @@ -569,6 +582,17 @@ static void eval(Env & env, Expr e, Value & v) return; } + Expr e3; + if (matchIf(e, e1, e2, e3)) { + eval(env, evalBool(env, e1) ? e2 : e3, v); + return; + } + + if (matchOpOr(e, e1, e2)) { + mkBool(v, evalBool(env, e1) || evalBool(env, e2)); + return; + } + throw Error("unsupported term"); } @@ -633,6 +657,10 @@ void doTest(string s) v.type = tBool; v.boolean = false; } + { + Value & v = baseEnv.bindings[toATerm("null")]; + v.type = tNull; + } /* Add primops to the base environment. */ addPrimOp(baseEnv, "__head", 1, prim_head); @@ -689,6 +717,10 @@ void run(Strings args) doTest("null"); doTest("\"foo\""); doTest("let s = \"bar\"; in \"foo${s}\""); + doTest("if true then 1 else 2"); + doTest("if false then 1 else 2"); + doTest("if false || true then 1 else 2"); + doTest("let x = x; in if true || x then 1 else 2"); printMsg(lvlError, format("alloced %1% values") % nrValues); printMsg(lvlError, format("alloced %1% environments") % nrEnvs); |