/// <summary>
/// 克隆当前元素到新的宿主模板
/// </summary>
/// <param name="ownerTemplate"></param>
/// <returns></returns>
internal override Element Clone(Template ownerTemplate)
{
VariableTag tag = new VariableTag(ownerTemplate, (VariableExpression)this.VarExpression.Clone(ownerTemplate));
foreach (var att in this.Attributes)
{
tag.Attributes.Add(att.Clone(ownerTemplate));
}
foreach (IExpression exp in this.CallFunctions)
{
tag.CallFunctions.Add(exp.Clone(ownerTemplate));
}
return(tag);
}
/// <summary>
/// 构建变量标签元素
/// </summary>
/// <param name="ownerTemplate">宿主模板</param>
/// <param name="container">标签的容器</param>
/// <param name="match"></param>
internal static VariableTag CreateVariableTag(Template ownerTemplate, Tag container, Match match)
{
string prefix;
Variable variable = CreateVariable(ownerTemplate, match, out prefix);
VariableIdentity variableId = new VariableIdentity(ownerTemplate, variable, prefix);
//变量标签元素则需要缓存表达式的值
VariableExpression varExp = CreateVariableExpression(variableId, match, true);
VariableTag tag = new VariableTag(ownerTemplate, varExp);
//解析属性列表
ParseElementAttributes(tag, match);
container.AppendChild(tag);
return tag;
}
/// <summary>
/// 呈现本元素的数据
/// </summary>
/// <param name="writer"></param>
public override void Render(System.IO.TextWriter writer)
{
VariableTag tag = this;
object value = this.VarExpression.GetValue();
//调用自定函数处理此变量的值
if (this.CallFunctions.Count > 0)
{
foreach (var exp in this.CallFunctions)
{
object method = exp.GetValue();
if (!Utility.IsNothing(method))
{
UserDefinedFunction func;
if (this.OwnerTemplate.UserDefinedFunctions.TryGetValue(method.ToString(), out func))
{
value = func(new object[] { value });
}
}
}
}
if (Utility.IsNothing(value))
{
return;
}
bool formated = false;
string text = string.Empty;
string format = this.Format == null ? string.Empty : this.Format.GetTextValue();
if (value is string)
{
//字符串
text = (string)value;
}
else
{
//非字符串.则判断处理format
if (!string.IsNullOrEmpty(format))
{
IFormattable iformat = value as IFormattable;
if (iformat != null)
{
text = iformat.ToString(format, CultureInfo.InvariantCulture);
formated = true;
}
}
//非IFormattable接口.则直接取字符串处理
if (!formated)
{
//如果数据是IEnumerable,IEnumerator接口则进行数据拼凑
IEnumerator ie = null;
if (value is IEnumerable)
{
ie = ((IEnumerable)value).GetEnumerator();
}
else if (value is IEnumerator)
{
ie = (IEnumerator)value;
}
if (ie != null)
{
StringBuilder buffer = new StringBuilder();
ie.Reset();
while (ie.MoveNext())
{
if (buffer.Length != 0)
{
buffer.Append(",");
}
buffer.Append(ie.Current);
}
text = buffer.ToString();
}
else
{
text = value.ToString();
}
}
}
if (text.Length > 0)
{
bool removeHtml = this.RemoveHtml == null ? false : Utility.ConverToBoolean(this.RemoveHtml.GetTextValue());
bool textEncode = this.TextEncode == null ? false : Utility.ConverToBoolean(this.TextEncode.GetTextValue());
bool htmlEncode = this.HtmlEncode == null ? false : Utility.ConverToBoolean(this.HtmlEncode.GetTextValue());
bool xmlEncode = this.XmlEncode == null ? false : Utility.ConverToBoolean(this.XmlEncode.GetTextValue());
bool jsEncode = this.JsEncode == null ? false : Utility.ConverToBoolean(this.JsEncode.GetTextValue());
bool urlEncode = this.UrlEncode == null ? false : Utility.ConverToBoolean(this.UrlEncode.GetTextValue());
bool compressText = this.CompressText == null ? false : Utility.ConverToBoolean(this.CompressText.GetTextValue());
int length = this.Length == null ? 0 : Utility.ConverToInt32(this.Length.GetTextValue());
string appendText = this.AppendText == null ? string.Empty : this.AppendText.GetTextValue();
//Encoding charset = this.Charset == null ? this.OwnerTemplate.Charset : Utility.GetEncodingFromCharset(this.Charset.GetTextValue(), this.OwnerTemplate.Charset);
Encoding charset = Encoding.UTF8;
if (removeHtml)
{
text = Utility.RemoveHtmlCode(text);
}
if (length > 0)
{
text = Utility.CutString(text, length, charset, appendText);
}
if (textEncode)
{
text = Utility.TextEncode(text);
}
else if (htmlEncode)
{
text = HttpUtility.HtmlEncode(text);
}
if (xmlEncode)
{
text = Utility.XmlEncode(text);
}
if (jsEncode)
{
text = Utility.JsEncode(text);
}
if (urlEncode)
{
text = HttpUtility.UrlEncode(text, charset);
}
if (compressText)
{
text = Utility.CompressText(text);
}
if (!formated && !string.IsNullOrEmpty(format))
{
text = string.Format(format, text);
}
writer.Write(text);
}
}
/// <summary>
/// 克隆当前元素到新的宿主模板
/// </summary>
/// <param name="ownerTemplate"></param>
/// <returns></returns>
internal override Element Clone(Template ownerTemplate)
{
VariableTag tag = new VariableTag(ownerTemplate, (VariableExpression)this.VarExpression.Clone(ownerTemplate));
foreach (var att in this.Attributes)
{
tag.Attributes.Add(att.Clone(ownerTemplate));
}
foreach (IExpression exp in this.CallFunctions)
{
tag.CallFunctions.Add(exp.Clone(ownerTemplate));
}
return tag;
}