/// <summary>
/// Verifies template syntax and throws <see cref="ParserException">ParserException</see> when error is found.
/// </summary>
/// <exception cref="ParserException">Thrown when error is found.</exception>
public void CheckSyntax()
{
// create lexer
lexer = new Lexer(data);
// create parser
parser = new Parser(lexer);
// parse template
parser.Parse();
}
/// <summary>
/// Evaluates template to the StringWriter.
/// </summary>
/// <param name="writer">StringWriter to write evaluation results.</param>
public void Evaluate(StringWriter writer)
{
if(writer == null)
throw new ArgumentNullException("writer");
if (lexer == null)
{
// create lexer
lexer = new Lexer(data);
// create parser
parser = new Parser(lexer);
// parse template
statements = parser.Parse();
}
// index custom templates
int i = 0;
while (i < statements.Count)
{
TemplateStatement tmpStatement = statements[i] as TemplateStatement;
if (tmpStatement != null)
{
context.Templates.Add(tmpStatement.Name, tmpStatement);
statements.RemoveAt(i);
continue;
}
i++;
}
// evaluate template statements
foreach (AST.Statement stm in statements)
{
// eval next statement
stm.Eval(context, writer);
}
}
private static void TestLexer(string data)
{
List<Token> tokens = new List<Token>();
Lexer lex = new Lexer(data);
while (true)
{
Token token = lex.Next();
tokens.Add(token);
Debug.WriteLine(String.Format("{0} [{1},{2}]: {3}", token.TokenType, token.Line, token.Column, token.Data));
if (token.TokenType == TokenType.EOF)
break;
}
Console.ReadKey();
}
public Parser(Lexer lexer)
{
this.lexer = lexer;
this.statements = new List<Statement>();
}
public Parser(Lexer lexer)
{
this.lexer = lexer;
this.statements = new List <Statement>();
}