/// <summary>
/// 变量表达式
/// </summary>
/// <param name="variableId"></param>
/// <param name="fieldName"></param>
/// <param name="isMethod"></param>
/// <param name="needCacheData"></param>
internal DMEWeb_VariableExpression(DMEWeb_VariableIdentity variableId, string fieldName, bool isMethod, bool needCacheData)
{
this.VariableId = variableId;
this.FieldName = fieldName;
this.IsMethod = isMethod;
this.NeedCacheData = needCacheData;
}
/// <summary>
/// 变量表达式
/// </summary>
/// <param name="variableId"></param>
/// <param name="needCacheData"></param>
internal DMEWeb_VariableExpression(DMEWeb_VariableIdentity variableId, bool needCacheData)
: this(variableId, null, false, needCacheData)
{
}
/// <summary>
/// 从变量表达式文本(如:name.age)中构建变量表达式
/// </summary>
/// <param name="ownerTemplate"></param>
/// <param name="expressionText"></param>
/// <param name="needCacheData"></param>
/// <returns></returns>
internal static DMEWeb_VariableExpression CreateVariableExpression(DMEWeb_Template ownerTemplate, string expressionText, bool needCacheData)
{
if (string.IsNullOrEmpty(expressionText)) return null;
Match match = DMEWeb_ParserRegex.VarExpRegex.Match(expressionText);
if (match.Success)
{
string prefix;
DMEWeb_Variable variable = CreateVariable(ownerTemplate, match, out prefix);
DMEWeb_VariableIdentity variableId = new DMEWeb_VariableIdentity(ownerTemplate, variable, prefix);
return CreateVariableExpression(variableId, match, needCacheData);
}
else
{
//非变量表达式
throw new DMEWeb_ParserException(string.Format("变量表达式\"{0}\"的定义格式错误", expressionText));
}
}
/// <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 DMEWeb_VariableTag CreateVariableTag(DMEWeb_Template ownerTemplate, DMEWeb_Tag container, Match match)
{
string prefix;
DMEWeb_Variable variable = CreateVariable(ownerTemplate, match, out prefix);
DMEWeb_VariableIdentity variableId = new DMEWeb_VariableIdentity(ownerTemplate, variable, prefix);
//变量标签元素则需要缓存表达式的值
DMEWeb_VariableExpression varExp = CreateVariableExpression(variableId, match, true);
DMEWeb_VariableTag tag = new DMEWeb_VariableTag(ownerTemplate, varExp);
//解析属性列表
ParseElementAttributes(tag, match);
container.AppendChild(tag);
return tag;
}
/// <summary>
/// 构建变量的字段列表
/// </summary>
/// <param name="variableId"></param>
/// <param name="match"></param>
/// <param name="needCacheData"></param>
/// <returns></returns>
internal static DMEWeb_VariableExpression CreateVariableExpression(DMEWeb_VariableIdentity variableId, Match match, bool needCacheData)
{
//解析变量字段列表
DMEWeb_VariableExpression field = new DMEWeb_VariableExpression(variableId, needCacheData);
CaptureCollection fields = match.Groups["field"].Captures;
CaptureCollection methods = match.Groups["method"].Captures;
DMEWeb_VariableExpression item = field;
for (var i = 0; i < fields.Count; i++)
{
string fieldName = fields[i].Value;
DMEWeb_VariableExpression exp = new DMEWeb_VariableExpression(item, fieldName, !string.IsNullOrEmpty(methods[i].Value));
item = exp;
}
return field;
}
