public bool GetAST(out ProgramAst prg)
{
program = new ProgramAst();
prg = program;
BaseAst node = BaseAst.GetInitLoopAstNode();
while ((node.Token != TokenTypes.End) && (!node.IsError))
{
ReadNextAst();
node = actualNode;
switch (actualNode.Token)
{
case TokenTypes.VarRW: // deklarace globalni promenne
node = GetVariables();
break;
case TokenTypes.FunctionRW: // deklarace funkce
node = GetFunctionAST(node as FunctionAst);
break;
case TokenTypes.End: // konec programu
break;
default:
node = BaseAst.GetErrorAstNode(string.Format("Je ocekavano klicove slovo 'var' nebo 'function', radek {0}, sloupec {1}", node.TokenStartLine, node.TokenStartColumn));
break;
}
}
if (node.IsError)
{
Console.WriteLine("Error: '{0}'", node.ErrorMessage);
return(false);
}
return(true);
}
private BaseAst GetBlockAST(BlockAst block)
{
if (block == null)
{
return(BaseAst.GetErrorAstNode("Chybne volana funkce 'GetBlockAST(BlockAst block)', parametr 'block' je null"));
}
BaseAst node = BaseAst.GetInitLoopAstNode();
while ((node.Token != TokenTypes.BraceRight) && !(node.IsError))
{
node = GetStatementAST();
switch (node.Token)
{
case TokenTypes.End:
return(BaseAst.GetErrorAstNode(string.Format("Konec programu, blok neni korektne ukoncen, radek {0}, sloupec {1}", node.TokenStartLine, node.TokenStartColumn)));
case TokenTypes.BraceLeft:
node = GetBlockAST(node as BlockAst);
break;
}
if (node.IsError)
{
return(node);
}
if (node.Token == TokenTypes.BraceRight)
{
break;
}
block.Statements.Add(node);
}
return(block);
}
