Fix issue 1860; exception thrown in the parser on if/if-else/for/while/do-while

statements with no body.

2 files changed, 14 insertions, 10 deletions

diff --git a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/CSCodeGenerator.cs b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/CSCodeGenerator.cs
index f129859..631aa54 100644
--- a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/CSCodeGenerator.cs
+++ b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/CSCodeGenerator.cs
@@ -388,14 +388,18 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine.Compiler.LSL
         private string GenerateStatement(Statement s)
         {
             string retstr = String.Empty;
-
-            // Jump label prints its own colon, we don't need a semicolon.
-            bool printSemicolon = !(s.kids.Top is JumpLabel);
+            bool printSemicolon = true;
 
             retstr += Indent();
 
-            foreach (SYMBOL kid in s.kids)
-                retstr += GenerateNode(kid);
+            if (0 < s.kids.Count)
+            {
+                // Jump label prints its own colon, we don't need a semicolon.
+                printSemicolon = !(s.kids.Top is JumpLabel);
+
+                foreach (SYMBOL kid in s.kids)
+                    retstr += GenerateNode(kid);
+            }
 
             if (printSemicolon)
                 retstr += GenerateLine(";");
diff --git a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/lsl.parser.cs b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/lsl.parser.cs
index 178eed1..14c090d 100644
--- a/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/lsl.parser.cs
+++ b/OpenSim/Region/ScriptEngine/DotNetEngine/Compiler/LSL/lsl.parser.cs
@@ -359,7 +359,7 @@ public override int yynum { get { return 114; }}
 public StateChange(Parser yyp):base(yyp){}}
 //%+IfStatement+115
 public class IfStatement : SYMBOL{
- private  void  AddStatement ( Statement  s ){ if ( s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
+ private  void  AddStatement ( Statement  s ){ if (0< s . kids . Count && s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
  else  kids . Add ( s );
 }
  public  IfStatement (Parser yyp, Expression  e , Statement  ifs ):base(((LSLSyntax
@@ -369,7 +369,7 @@ public class IfStatement : SYMBOL{
  public  IfStatement (Parser yyp, Expression  e , Statement  ifs , Statement  es ):base(((LSLSyntax
 )yyp)){ kids . Add ( e );
  AddStatement ( ifs );
- if ( es . kids . Top  is  IfStatement ) kids . Add ( es . kids . Pop ());
+ if (0< es . kids . Count && es . kids . Top  is  IfStatement ) kids . Add ( es . kids . Pop ());
  else  AddStatement ( es );
 }
 
@@ -380,7 +380,7 @@ public IfStatement(Parser yyp):base(yyp){}}
 public class WhileStatement : SYMBOL{
  public  WhileStatement (Parser yyp, Expression  e , Statement  s ):base(((LSLSyntax
 )yyp)){ kids . Add ( e );
- if ( s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
+ if (0< s . kids . Count && s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
  else  kids . Add ( s );
 }
 
@@ -390,7 +390,7 @@ public WhileStatement(Parser yyp):base(yyp){}}
 //%+DoWhileStatement+117
 public class DoWhileStatement : SYMBOL{
  public  DoWhileStatement (Parser yyp, Expression  e , Statement  s ):base(((LSLSyntax
-)yyp)){ if ( s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
+)yyp)){ if (0< s . kids . Count && s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
  else  kids . Add ( s );
  kids . Add ( e );
 }
@@ -404,7 +404,7 @@ public class ForLoop : SYMBOL{
 )yyp)){ kids . Add ( flsa );
  kids . Add ( e );
  kids . Add ( flsb );
- if ( s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
+ if (0< s . kids . Count && s . kids . Top  is  CompoundStatement ) kids . Add ( s . kids . Pop ());
  else  kids . Add ( s );
 }