jscript: Added minus expression implementation.

dlls/jscript/engine.c

@@ -1674,10 +1674,33 @@ HRESULT typeof_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags
     return S_OK;
 }
 
-HRESULT minus_expression_eval(exec_ctx_t *ctx, expression_t *expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
+/* ECMA-262 3rd Edition    11.4.7 */
+HRESULT minus_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    unary_expression_t *expr = (unary_expression_t*)_expr;
+    exprval_t exprval;
+    VARIANT val, num;
+    HRESULT hres;
+
+    TRACE("\n");
+
+    hres = expr_eval(ctx, expr->expression, 0, ei, &exprval);
+    if(FAILED(hres))
+        return hres;
+
+    hres = exprval_to_value(ctx->parser->script, &exprval, ei, &val);
+    exprval_release(&exprval);
+    if(FAILED(hres))
+        return hres;
+
+    hres = to_number(ctx->parser->script, &val, ei, &num);
+    VariantClear(&val);
+    if(FAILED(hres))
+        return hres;
+
+    ret->type = EXPRVAL_VARIANT;
+    num_set_val(&ret->u.var, -num_val(&num));
+    return S_OK;
 }
 
 HRESULT plus_expression_eval(exec_ctx_t *ctx, expression_t *expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)

dlls/jscript/tests/lang.js

@@ -181,6 +181,10 @@ tmp = 4.5-2;
 ok(tmp === 2.5, "4.5-2 !== 2.5");
 ok(getVT(tmp) === "VT_R8", "getVT(4-2) !== VT_R8");
 
+tmp = -2;
+ok(tmp === 0-2, "-2 !== 0-2");
+ok(getVT(tmp) === "VT_I4", "getVT(-2) !== VT_I4");
+
 tmp = 2*3;
 ok(tmp === 6, "2*3 !== 6");
 ok(getVT(tmp) === "VT_I4", "getVT(2*3) !== VT_I4");