Ghislain Fourny has proposed merging lp:~gislenius/zorba/jsoniq-truefalsenull 
into lp:zorba/3.0.

Requested reviews:
  Matthias Brantner (matthias-brantner)

For more details, see:
https://code.launchpad.net/~gislenius/zorba/jsoniq-truefalsenull/+merge/91839

Allows standalone true, false, null expressions to be interpreted as booleans 
or nulls. User must now use ./true, ./false or ./null for XML navigation on 
elements named that way.
-- 
https://code.launchpad.net/~gislenius/zorba/jsoniq-truefalsenull/+merge/91839
Your team Zorba Coders is subscribed to branch lp:zorba/3.0.
=== modified file 'src/compiler/parser/xquery_parser.y'
--- src/compiler/parser/xquery_parser.y	2012-02-01 11:29:03 +0000
+++ src/compiler/parser/xquery_parser.y	2012-02-07 14:41:54 +0000
@@ -3866,7 +3866,7 @@
     {
       RelativePathExpr* rpe;
 
-      rpe = new RelativePathExpr(LOC(@$), ParseConstants::st_slash, NULL, $2);
+      rpe = new RelativePathExpr(LOC(@$), ParseConstants::st_slash, NULL, $2, false);
 
       $$ = new PathExpr(LOC(@$),
                         ParseConstants::path_leading_slash,
@@ -3876,7 +3876,7 @@
     {
       RelativePathExpr* rpe;
 
-      rpe = new RelativePathExpr(LOC(@$), ParseConstants::st_slashslash, NULL, $2);
+      rpe = new RelativePathExpr(LOC(@$), ParseConstants::st_slashslash, NULL, $2, false);
 
       $$ = new PathExpr(LOC(@$),
                         ParseConstants::path_leading_slashslash,
@@ -3910,17 +3910,17 @@
       $$ = (as ?
             new RelativePathExpr(LOC(@$),
                                  ParseConstants::st_slash,
-                                 new ContextItemExpr( LOC(@$), true ), $1)
+                                 new ContextItemExpr( LOC(@$), true ), $1, true)
             :
             $1);
     }
   | StepExpr SLASH RelativePathExpr
     {
-      $$ = new RelativePathExpr(LOC(@$), ParseConstants::st_slash, $1, $3);
+      $$ = new RelativePathExpr(LOC(@$), ParseConstants::st_slash, $1, $3, false);
     }
   | StepExpr SLASH_SLASH RelativePathExpr
     {
-      $$ = new RelativePathExpr(LOC(@$), ParseConstants::st_slashslash, $1, $3);
+      $$ = new RelativePathExpr(LOC(@$), ParseConstants::st_slashslash, $1, $3, false);
     }
 ;
 

=== modified file 'src/compiler/parsetree/parsenodes.cpp'
--- src/compiler/parsetree/parsenodes.cpp	2012-02-07 00:23:01 +0000
+++ src/compiler/parsetree/parsenodes.cpp	2012-02-07 14:41:54 +0000
@@ -2914,11 +2914,13 @@
   const QueryLoc& loc_,
   enum ParseConstants::steptype_t _step_type,
   rchandle<exprnode> step,
-  rchandle<exprnode> rpe)
+  rchandle<exprnode> rpe,
+  bool implicit)
   :
   exprnode(loc_),
   step_type(_step_type),
-  step_expr_h(step)
+  step_expr_h(step),
+  is_implicit_b(implicit)
 {
   RelativePathExpr* rpep = dynamic_cast<RelativePathExpr*>(rpe.getp());
   if (rpep != NULL)

=== modified file 'src/compiler/parsetree/parsenodes.h'
--- src/compiler/parsetree/parsenodes.h	2012-02-01 11:29:03 +0000
+++ src/compiler/parsetree/parsenodes.h	2012-02-07 14:41:54 +0000
@@ -3541,19 +3541,23 @@
   enum ParseConstants::steptype_t step_type;
   rchandle<exprnode> step_expr_h;
   rchandle<exprnode> relpath_expr_h;
+  bool is_implicit_b;
 
 public:
   RelativePathExpr(
     const QueryLoc&,
     ParseConstants::steptype_t,
     rchandle<exprnode>,
-    rchandle<exprnode>);
+    rchandle<exprnode>,
+    bool implicit);
 
   enum ParseConstants::steptype_t get_step_type() const { return step_type; }
 
   rchandle<exprnode> get_step_expr() const { return step_expr_h; }
 
   rchandle<exprnode> get_relpath_expr() const { return relpath_expr_h; }
+  
+  bool is_implicit() const { return is_implicit_b; }
 
   virtual void accept(parsenode_visitor&) const;
 };

=== modified file 'src/compiler/translator/translator.cpp'
--- src/compiler/translator/translator.cpp	2012-02-07 01:23:28 +0000
+++ src/compiler/translator/translator.cpp	2012-02-07 14:41:54 +0000
@@ -8281,44 +8281,54 @@
 
   ParseConstants::pathtype_t pe_type = pe.get_type();
 
-  // terrible hack to allow for the value of a json pair to be
-  // null, true, false
+  // terrible hack to allow for a standalone true, false or null to be 
+  // interpreted as a boolean. User must use ./true, ./false or ./null for
+  // navigating XML elements named that way.
 #ifdef ZORBA_WITH_JSON
-  if (pe_type == ParseConstants::path_relative &&
-      !theNodeStack.empty() && theNodeStack.top().dyn_cast<json_pair_expr>())
+  if (pe_type == ParseConstants::path_relative)
   {
-    RelativePathExpr* lRelPathExpr
+    RelativePathExpr* lRootRelPathExpr
       = dynamic_cast<RelativePathExpr*>(pe.get_relpath_expr().getp());
-    AxisStep* lStepExpr
-      = dynamic_cast<AxisStep*>(lRelPathExpr->get_relpath_expr().getp());
-    if (lStepExpr)
+    ContextItemExpr* lStepExpr
+    = dynamic_cast<ContextItemExpr*>(lRootRelPathExpr->get_step_expr().getp());
+    AxisStep* lRelPathExpr
+    = dynamic_cast<AxisStep*>(lRootRelPathExpr->get_relpath_expr().getp());
+    // Only rewrites if expression consists of a context item step on the left
+    // and of an axis step on the right,
+    // AND if this context item was set implicitly by the parser, meaning,
+    // the original expression was only an axis step.
+    if (lRelPathExpr && lStepExpr && lRootRelPathExpr->is_implicit())
     {
       ForwardStep* lFwdStep
-        = dynamic_cast<ForwardStep*>(lStepExpr->get_forward_step().getp());
+        = dynamic_cast<ForwardStep*>(lRelPathExpr->get_forward_step().getp());
       if (lFwdStep && lFwdStep->get_axis_kind() == ParseConstants::axis_child)
       {
         AbbrevForwardStep* lAbbrFwdStep
           = dynamic_cast<AbbrevForwardStep*>(lFwdStep->get_abbrev_step().getp());
-        const NameTest* lNodetest
-          = dynamic_cast<const NameTest*>(lAbbrFwdStep->get_node_test());
-        const rchandle<QName> lQName = lNodetest->getQName();
-        if (lQName && lQName->get_namespace() == "")
-        {
-          const zstring& lLocal = lQName->get_localname();
-          if (lLocal == "true")
-          {
-            push_nodestack(new const_expr(theRootSctx, loc, true));
-            return (void*)1;
-          } else if (lLocal == "false")
-          {
-            push_nodestack(new const_expr(theRootSctx, loc, false));
-            return (void*)1;
-          } else if (lLocal == "null")
-          {
-            store::Item_t lNull;
-            GENV_ITEMFACTORY->createJSONNull(lNull);
-            push_nodestack(new const_expr(theRootSctx, loc, lNull));
-            return (void*)1;
+        if (lAbbrFwdStep) {
+          const NameTest* lNodetest
+            = dynamic_cast<const NameTest*>(lAbbrFwdStep->get_node_test());
+          if (lNodetest) {
+            const rchandle<QName> lQName = lNodetest->getQName();
+            if (lQName && lQName->get_namespace() == "")
+            {
+              const zstring& lLocal = lQName->get_localname();
+              if (lLocal == "true")
+              {
+                push_nodestack(new const_expr(theRootSctx, loc, true));
+                return (void*)1;
+              } else if (lLocal == "false")
+              {
+                push_nodestack(new const_expr(theRootSctx, loc, false));
+                return (void*)1;
+              } else if (lLocal == "null")
+              {
+                store::Item_t lNull;
+                GENV_ITEMFACTORY->createJSONNull(lNull);
+                push_nodestack(new const_expr(theRootSctx, loc, lNull));
+                return (void*)1;
+              }
+            }
           }
         }
       }

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