private Statement ParseTemplateStatement()
{
// parse statement declaration
TemplateStatement stm = new TemplateStatement(current.Line, current.Column);
Consume(TokenType.Template);
// parse tag attributes
do
{
if (Current.TokenType != TokenType.Attribute)
{
throw new ParserException("Expected tag attribute", stm.Line, stm.Column);
}
string attrName = Current.Data;
Consume(TokenType.Attribute);
Consume(TokenType.Assign);
// look for "test" attribute
if (attrName == "name")
{
stm.Name = Current.Data;
Consume(TokenType.String);
}
}while (Current.TokenType == TokenType.Attribute);
// check statement
if (stm.Name == null)
{
throw new ParserException("\"name\" attribute was not specified", stm.Line, stm.Column);
}
// parse body
while (true)
{
if (Current.TokenType == TokenType.EndTemplate)
{
break;
}
else
{
Statement blockStm = ParseStatement();
if (blockStm == null)
{
throw new ParserException("Expected {/template} tag", stm.Line, stm.Column);
}
// parse statement
stm.Statements.Add(blockStm);
}
}
Consume(TokenType.EndTemplate);
return(stm);
}
/// <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);
}
}