/// <summary>
/// Loads the requested script and converts it to an AST
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
private IList<AbstractNode> _loadImportPath( string name )
{
IList<AbstractNode> retval = null;
IList<ConcreteNode> nodes = null;
if ( this.OnImportFile != null )
this.OnImportFile( this, name );
if ( nodes != null && ResourceGroupManager.Instance != null )
{
using ( Stream stream = ResourceGroupManager.Instance.OpenResource( name, _resourceGroup ) )
{
if ( stream != null )
{
ScriptLexer lexer = new ScriptLexer();
ScriptParser parser = new ScriptParser();
IList<ScriptToken> tokens = null;
using ( StreamReader reader = new StreamReader( stream ) )
{
tokens = lexer.Tokenize( reader.ReadToEnd(), name );
}
nodes = parser.Parse( tokens );
}
}
}
if ( nodes != null )
retval = _convertToAST( nodes );
return retval;
}
/// <summary>
/// Takes in a string of script code and compiles it into resources
/// </summary>
/// <param name="script">The script code</param>
/// <param name="source">The source of the script code (e.g. a script file)</param>
/// <param name="group">The resource group to place the compiled resources into</param>
/// <returns></returns>
public bool Compile( String script, String source, String group )
{
ScriptLexer lexer = new ScriptLexer();
ScriptParser parser = new ScriptParser();
IList<ScriptToken> tokens = lexer.Tokenize( script, source );
IList<ConcreteNode> nodes = parser.Parse( tokens );
return Compile( nodes, group );
}
/// <summary>
/// Handles processing the variables
/// </summary>
/// <param name="nodes"></param>
private void _processVariables( ref IList<AbstractNode> nodes )
{
for ( int i = 0; i < nodes.Count; ++i )
{
AbstractNode cur = nodes[ i ];
if ( cur is ObjectAbstractNode )
{
// Only process if this object is not abstract
ObjectAbstractNode obj = (ObjectAbstractNode)cur;
if ( !obj.IsAbstract )
{
_processVariables( ref obj.Children );
_processVariables( ref obj.Values );
}
}
else if ( cur is PropertyAbstractNode )
{
PropertyAbstractNode prop = (PropertyAbstractNode)cur;
_processVariables( ref prop.Values );
}
else if ( cur is VariableGetAbstractNode )
{
VariableGetAbstractNode var = (VariableGetAbstractNode)cur;
// Look up the enclosing scope
ObjectAbstractNode scope = null;
AbstractNode temp = var.Parent;
while ( temp != null )
{
if ( temp is ObjectAbstractNode )
{
scope = (ObjectAbstractNode)temp;
break;
}
temp = temp.Parent;
}
// Look up the variable in the environment
KeyValuePair<bool, string> varAccess = new KeyValuePair<bool, string>( false, string.Empty );
if ( scope != null )
varAccess = scope.GetVariable( var.Name );
if ( scope == null || !varAccess.Key )
{
bool found = _environment.ContainsKey( var.Name );
if ( found )
varAccess = new KeyValuePair<bool, string>( true, _environment[ var.Name ] );
else
varAccess = new KeyValuePair<bool, string>( false, varAccess.Value );
}
if ( varAccess.Key )
{
// Found the variable, so process it and insert it into the tree
ScriptLexer lexer = new ScriptLexer();
IList<ScriptToken> tokens = lexer.Tokenize( varAccess.Value, var.File );
ScriptParser parser = new ScriptParser();
IList<ConcreteNode> cst = parser.ParseChunk( tokens );
IList<AbstractNode> ast = _convertToAST( cst );
// Set up ownership for these nodes
foreach ( AbstractNode currentNode in ast )
currentNode.Parent = var.Parent;
// Recursively handle variable accesses within the variable expansion
_processVariables( ref ast );
// Insert the nodes in place of the variable
for ( int j = 0; j < ast.Count; j++ )
nodes.Insert( j, ast[ j ] );
}
else
{
// Error
AddError( CompileErrorCode.UndefinedVariable, var.File, var.Line );
}
// Remove the variable node
nodes.RemoveAt( i );
i--;
}
}
}
/// <summary>
/// Takes in a string of script code and compiles it into resources
/// </summary>
/// <param name="script">The script code</param>
/// <param name="source">The source of the script code (e.g. a script file)</param>
/// <param name="group">The resource group to place the compiled resources into</param>
/// <returns></returns>
public bool Compile( String script, String source, String group )
{
var lexer = new ScriptLexer();
var parser = new ScriptParser();
var tokens = lexer.Tokenize( script, source );
var nodes = parser.Parse( tokens );
return Compile( nodes, group );
}
