From fc5a8836e9e41c97536c372bf4c5c945701f21be Mon Sep 17 00:00:00 2001
From: Jacek Caban <jacek@codeweavers.com>
Date: Tue, 9 Sep 2008 01:24:22 +0200
Subject: [PATCH] jscript: Added scope chain implementation.

---
 dlls/jscript/engine.c  | 33 +++++++++++++++++++++++++++++++--
 dlls/jscript/engine.h  | 17 ++++++++++++++++-
 dlls/jscript/jscript.c |  2 +-
 3 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 614c1a40c6c..db13aef5c05 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -96,7 +96,19 @@ static void exprval_set_idref(exprval_t *val, IDispatch *disp, DISPID id)
         IDispatch_AddRef(disp);
 }
 
-HRESULT create_exec_ctx(exec_ctx_t **ret)
+void scope_release(scope_chain_t *scope)
+{
+    if(--scope->ref)
+        return;
+
+    if(scope->next)
+        scope_release(scope->next);
+
+    IDispatchEx_Release(_IDispatchEx_(scope->obj));
+    heap_free(scope);
+}
+
+HRESULT create_exec_ctx(scope_chain_t *scope, exec_ctx_t **ret)
 {
     exec_ctx_t *ctx;
 
@@ -104,6 +116,11 @@ HRESULT create_exec_ctx(exec_ctx_t **ret)
     if(!ctx)
         return E_OUTOFMEMORY;
 
+    if(scope) {
+        scope_addref(scope);
+        ctx->scope_chain = scope;
+    }
+
     *ret = ctx;
     return S_OK;
 }
@@ -113,6 +130,8 @@ void exec_release(exec_ctx_t *ctx)
     if(--ctx->ref)
         return;
 
+    if(ctx->scope_chain)
+        scope_release(ctx->scope_chain);
     heap_free(ctx);
 }
 
@@ -239,13 +258,23 @@ HRESULT exec_source(exec_ctx_t *ctx, parser_ctx_t *parser, source_elements_t *so
 /* ECMA-262 3rd Edition    10.1.4 */
 static HRESULT identifier_eval(exec_ctx_t *ctx, BSTR identifier, DWORD flags, exprval_t *ret)
 {
+    scope_chain_t *scope;
     named_item_t *item;
     DISPID id = 0;
     HRESULT hres;
 
     TRACE("%s\n", debugstr_w(identifier));
 
-    /* FIXME: scope chain */
+    for(scope = ctx->scope_chain; scope; scope = scope->next) {
+        hres = dispex_get_id(_IDispatchEx_(scope->obj), identifier, 0, &id);
+        if(SUCCEEDED(hres))
+            break;
+    }
+
+    if(scope) {
+        exprval_set_idref(ret, (IDispatch*)_IDispatchEx_(scope->obj), id);
+        return S_OK;
+    }
 
     hres = dispex_get_id(_IDispatchEx_(ctx->parser->script->global), identifier, 0, &id);
     if(SUCCEEDED(hres)) {
diff --git a/dlls/jscript/engine.h b/dlls/jscript/engine.h
index c8dcfba9d7f..964e2b70ee5 100644
--- a/dlls/jscript/engine.h
+++ b/dlls/jscript/engine.h
@@ -56,10 +56,25 @@ static inline void *parser_alloc_tmp(parser_ctx_t *ctx, DWORD size)
     return jsheap_alloc(&ctx->tmp_heap, size);
 }
 
+typedef struct _scope_chain_t {
+    LONG ref;
+    DispatchEx *obj;
+    struct _scope_chain_t *next;
+} scope_chain_t;
+
+HRESULT scope_push(scope_chain_t*,DispatchEx*,scope_chain_t**);
+void scope_release(scope_chain_t*);
+
+static inline void scope_addref(scope_chain_t *scope)
+{
+    scope->ref++;
+}
+
 struct _exec_ctx_t {
     LONG ref;
 
     parser_ctx_t *parser;
+    scope_chain_t *scope_chain;
 };
 
 static inline void exec_addref(exec_ctx_t *ctx)
@@ -68,7 +83,7 @@ static inline void exec_addref(exec_ctx_t *ctx)
 }
 
 void exec_release(exec_ctx_t*);
-HRESULT create_exec_ctx(exec_ctx_t**);
+HRESULT create_exec_ctx(scope_chain_t*,exec_ctx_t**);
 HRESULT exec_source(exec_ctx_t*,parser_ctx_t*,source_elements_t*,jsexcept_t*,VARIANT*);
 
 typedef struct _statement_t statement_t;
diff --git a/dlls/jscript/jscript.c b/dlls/jscript/jscript.c
index a9c0bb31cd0..50ba18cbed8 100644
--- a/dlls/jscript/jscript.c
+++ b/dlls/jscript/jscript.c
@@ -80,7 +80,7 @@ static HRESULT exec_global_code(JScript *This, parser_ctx_t *parser_ctx)
     VARIANT var;
     HRESULT hres;
 
-    hres = create_exec_ctx(&exec_ctx);
+    hres = create_exec_ctx(NULL, &exec_ctx);
     if(FAILED(hres))
         return hres;
 
-- 
2.11.4.GIT