/// <summary>
/// Genera un nuevo token y avanza.
/// </summary>
public Token Emit(TokenType t)
{
var token = new Token(t, this.Start, this.Input.Substring(this.Start, this.Pos - this.Start));
this.Tokens.Add(token);
this.Start = this.Pos;
if(Template.Debug)
{
Console.WriteLine("{0}. {1} -> {2}", this.Tokens.IndexOf(token), token.Type, token.Value);
}
return token;
}
static IRenderizable ParseIf (Token currentToken, List<Token> tokens, ref int index, Template mainTemplate)
{
var ifCondition = new IfCondition();
if(tokens.Count <= index)
{
throw new TemplateException(string.Format("Invalid if condition at: {0}", currentToken.Position));
}
var condition = tokens[index];
if(condition.Type == TokenType.Parameter)
{
ifCondition.ModelKey = condition.Value;
}
else
{
var function = ParseFunction(condition, tokens, ref index, null) as Function;
if(function == null)
{
throw new TemplateException(string.Format("Invalid if condition at: {0}", currentToken.Position));
}
ifCondition.Expression = function;
}
index++;
ifCondition.Body = Parse(mainTemplate, tokens, ref index);
// Parsear el else si existe
if(tokens.Count >= index && tokens[index].Value == "else")
{
index++;
ifCondition.ElseBody = Parse(mainTemplate, tokens, ref index);
}
return ifCondition;
}
/// <summary>
/// Parses the foreach. El formato es {{ foreach .posts -> post[, i] }}
/// Donde .posts es el IEnumerable que se itera, post es cada elemento en la iteración y i es el índice opcional.
/// </summary>
static IRenderizable ParseForeach (Token currentToken, List<Token> tokens, ref int index, Template mainTemplate)
{
var item = new Foreach ();
if (tokens.Count <= index)
{
throw new TemplateException(string.Format("Invalid foreach at: {0}", currentToken.Position));
}
// Parsear el nombre del elemento de la iteración
var nextToken = tokens [index];
if (nextToken.Type != TokenType.Parameter)
{
throw new TemplateException(string.Format("Invalid if foreach at: {0}. Iterate name not found", currentToken.Position));
}
item.IterateKey = nextToken.Value.Trim(argumentSeparators);
index++;
// si hay una coma para separar, ignorarla
nextToken = tokens [index];
if (nextToken.Type == TokenType.Parameter && nextToken.Value.Trim() == ",")
{
index++;
nextToken = tokens [index];
}
// Parsear el indice de la iteración (es opcional)
if (nextToken.Type == TokenType.Parameter && nextToken.Value.Trim() != "in")
{
item.IndexKey = nextToken.Value.Trim(argumentSeparators);
index++;
}
// Parsear el separador "in"
nextToken = tokens [index];
if (nextToken.Type != TokenType.Parameter && nextToken.Value.Trim() != "in")
{
throw new TemplateException(string.Format("Invalid if foreach at: {0}. Iterate separator 'in' not found", currentToken.Position));
}
index++;
nextToken = tokens [index];
if (nextToken.Type != TokenType.Parameter)
{
throw new TemplateException(string.Format("Invalid foreach at: {0}. Model not found", currentToken.Position));
}
item.ModelKey = nextToken.Value.Trim ();
index++;
item.Body = Parse(mainTemplate, tokens, ref index);
return item;
}
static IRenderizable ParseBlock(Token currentToken, List<Token> tokens, ref int index, Template mainTemplate)
{
var item = new TemplateBlock();
var nextToken = tokens [index];
if (nextToken.Type != TokenType.Parameter)
{
throw new TemplateException(string.Format("Invalid include at: {0}. Name not specified", currentToken.Position));
}
item.Path = nextToken.Value.Trim();
item.MainTemplate = mainTemplate;
item.Body = Parse(mainTemplate, tokens, ref index);
return item;
}
static IRenderizable ParseInclude(Token currentToken, List<Token> tokens, ref int index, Template mainTemplate)
{
var item = new Include();
if (tokens.Count <= index)
{
throw new TemplateException(string.Format("Invalid include at: {0}", currentToken.Position));
}
var nextToken = tokens [index];
if (nextToken.Type != TokenType.Parameter)
{
throw new TemplateException(string.Format("Invalid include at: {0}. Name not specified", currentToken.Position));
}
item.Path = nextToken.Value.Trim();
item.MainTemplate = mainTemplate;
// añadir la clave como referenciada.
mainTemplate.Templates[item.Path] = null;
return item;
}
static IRenderizable ParseFunction(Token currentToken, IList<Token> tokens, ref int index, Template mainTemplate)
{
var function = new Function();
function.Name = currentToken.Value.Trim();
function.Arguments = new List<string>();
while(tokens.Count > index + 1)
{
var nextToken = tokens [index + 1];
if(nextToken.Type != TokenType.Parameter)
{
break;
}
index++;
var tokenValue = nextToken.Value;
// si hay una coma para separar, ignorarla
if (nextToken.Type == TokenType.Parameter && tokenValue.Trim() == ",")
{
index++;
nextToken = tokens[index];
tokenValue = nextToken.Value;
}
tokenValue = tokenValue.Trim(argumentSeparators).Trim('"');
// añadir el argumento. Como pueden ir separados por comas, eliminarla.
function.Arguments.Add(tokenValue);
// En caso de que extienda a otra, el argumento es la ruta.
if(function.Name == "extends")
{
mainTemplate.BaseTemplate = tokenValue;
// añadir la clave como referenciada.
mainTemplate.Templates[tokenValue] = null;
}
}
return function;
}