From d699834892c0a47362c2f004a3222713ebda39ba Mon Sep 17 00:00:00 2001
From: Jacek Caban <jacek@codeweavers.com>
Date: Wed, 17 Sep 2008 23:29:16 +0200
Subject: [PATCH] jscript: Added '==' expression implementation.

---
 dlls/jscript/engine.c      | 119 ++++++++++++++++++++++++++++++++++++-
 dlls/jscript/tests/lang.js |  12 ++++
 2 files changed, 128 insertions(+), 3 deletions(-)

diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 2b663d3d2f5..65eeaf72107 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -1853,10 +1853,123 @@ HRESULT new_expression_eval(exec_ctx_t *ctx, expression_t *expr, DWORD flags, js
     return E_NOTIMPL;
 }
 
-HRESULT equal_expression_eval(exec_ctx_t *ctx, expression_t *expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
+/* ECMA-262 3rd Edition    11.9.3 */
+static HRESULT equal_values(exec_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcept_t *ei, BOOL *ret)
 {
-    FIXME("\n");
-    return E_NOTIMPL;
+    if(V_VT(lval) == V_VT(rval) || (is_num_vt(V_VT(lval)) && is_num_vt(V_VT(rval))))
+       return equal2_values(lval, rval, ret);
+
+    /* FIXME: NULL disps should be handled in more general way */
+    if(V_VT(lval) == VT_DISPATCH && !V_DISPATCH(lval)) {
+        VARIANT v;
+        V_VT(&v) = VT_NULL;
+        return equal_values(ctx, &v, rval, ei, ret);
+    }
+
+    if(V_VT(rval) == VT_DISPATCH && !V_DISPATCH(rval)) {
+        VARIANT v;
+        V_VT(&v) = VT_NULL;
+        return equal_values(ctx, lval, &v, ei, ret);
+    }
+
+    if((V_VT(lval) == VT_NULL && V_VT(rval) == VT_EMPTY) ||
+       (V_VT(lval) == VT_EMPTY && V_VT(rval) == VT_NULL)) {
+        *ret = TRUE;
+        return S_OK;
+    }
+
+    if(V_VT(lval) == VT_BSTR && is_num_vt(V_VT(rval))) {
+        VARIANT v;
+        HRESULT hres;
+
+        hres = to_number(ctx->parser->script, lval, ei, &v);
+        if(FAILED(hres))
+            return hres;
+
+        return equal_values(ctx, &v, rval, ei, ret);
+    }
+
+    if(V_VT(rval) == VT_BSTR && is_num_vt(V_VT(lval))) {
+        VARIANT v;
+        HRESULT hres;
+
+        hres = to_number(ctx->parser->script, rval, ei, &v);
+        if(FAILED(hres))
+            return hres;
+
+        return equal_values(ctx, lval, &v, ei, ret);
+    }
+
+    if(V_VT(rval) == VT_BOOL) {
+        VARIANT v;
+
+        V_VT(&v) = VT_I4;
+        V_I4(&v) = V_BOOL(rval) ? 1 : 0;
+        return equal_values(ctx, lval, &v, ei, ret);
+    }
+
+    if(V_VT(lval) == VT_BOOL) {
+        VARIANT v;
+
+        V_VT(&v) = VT_I4;
+        V_I4(&v) = V_BOOL(lval) ? 1 : 0;
+        return equal_values(ctx, &v, rval, ei, ret);
+    }
+
+
+    if(V_VT(rval) == VT_DISPATCH && (V_VT(lval) == VT_BSTR || is_num_vt(V_VT(lval)))) {
+        VARIANT v;
+        HRESULT hres;
+
+        hres = to_primitive(ctx->parser->script, rval, ei, &v);
+        if(FAILED(hres))
+            return hres;
+
+        hres = equal_values(ctx, lval, &v, ei, ret);
+
+        VariantClear(&v);
+        return hres;
+    }
+
+
+    if(V_VT(lval) == VT_DISPATCH && (V_VT(rval) == VT_BSTR || is_num_vt(V_VT(rval)))) {
+        VARIANT v;
+        HRESULT hres;
+
+        hres = to_primitive(ctx->parser->script, lval, ei, &v);
+        if(FAILED(hres))
+            return hres;
+
+        hres = equal_values(ctx, &v, rval, ei, ret);
+
+        VariantClear(&v);
+        return hres;
+    }
+
+
+    *ret = FALSE;
+    return S_OK;
+}
+
+/* ECMA-262 3rd Edition    11.9.1 */
+HRESULT equal_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
+{
+    binary_expression_t *expr = (binary_expression_t*)_expr;
+    VARIANT rval, lval;
+    BOOL b;
+    HRESULT hres;
+
+    TRACE("\n");
+
+    hres = get_binary_expr_values(ctx, expr, ei, &rval, &lval);
+    if(FAILED(hres))
+        return hres;
+
+    hres = equal_values(ctx, &rval, &lval, ei, &b);
+    if(FAILED(hres))
+        return hres;
+
+    return return_bool(ret, b);
 }
 
 /* ECMA-262 3rd Edition    11.9.4 */
diff --git a/dlls/jscript/tests/lang.js b/dlls/jscript/tests/lang.js
index bd2cfc935ff..c231180f3ab 100644
--- a/dlls/jscript/tests/lang.js
+++ b/dlls/jscript/tests/lang.js
@@ -37,6 +37,18 @@ ok(!(undefined === null), "!(undefined === null) is false");
 ok(1 !== 2, "1 !== 2 is false");
 ok(null !== undefined, "null !== undefined is false");
 
+ok(1 == 1, "1 == 1 is false");
+ok(!(1 == 2), "!(1 == 2) is false");
+ok(1.0 == 1, "1.0 == 1 is false");
+ok("abc" == "abc", "\"abc\" == \"abc\" is false");
+ok(true == true, "true == true is false");
+ok(null == null, "null == null is false");
+ok(undefined == undefined, "undefined == undefined is false");
+ok(undefined == null, "undefined == null is false");
+ok(true == 1, "true == 1 is false");
+ok(!(true == 2), "true == 2");
+ok(0 == false, "0 == false is false");
+
 var trueVar = true;
 ok(trueVar, "trueVar is not true");