object GetMemberValue(string member)
{
var members = member.Split('.');
object context = null;
for (var i = 0; i < members.Length; i++)
{
if (i == 0)
{
var parser = this.Parsers.SingleOrDefault(p => p.Name == members[i]);
if (parser == null)
{
context = BlockParser.GetValue(this.Parsers.First().Context, members[i]);
}
else
{
context = parser.Context;
}
}
else
{
context = BlockParser.GetValue(context, members[i]);
}
}
return(context);
}
public static string Parse(string template, object context, string contextName = "Context")
{
if (template == null || context == null || contextName == null)
{
throw new ArgumentNullException();
}
var blockParser = new BlockParser(context, contextName);
return(blockParser.Parse(template));
}
public string Parse(string block)
{
var resultBuilder = new StringBuilder();
var blockBuilder = new StringBuilder();
string forItem = null;
System.Collections.IEnumerable forMembers = null;
var ifParameters = new List <IfParameter>();
var blockStates = new Stack <BlockState>();
for (; ;)
{
var match = BlockMatcher.GetMatch(block);
if (match == null)
{
if (blockStates.Count != 0)
{
throw new ConstructionException();
}
resultBuilder.Append(block);
return(resultBuilder.ToString().UnescapeTemplate());
}
if (blockStates.Count == 0)
{
resultBuilder.Append(block.Substring(0, match.Match.Index));
}
else
{
blockBuilder.Append(block.Substring(0, match.Match.Index));
}
block = block.Substring(match.Match.Index + match.Match.Length, block.Length - match.Match.Index - match.Match.Length);
switch (match.Type)
{
case BlockType.Tag:
if (blockStates.Count == 0)
{
var member = match.Match.Groups["member"];
if (member.Success)
{
resultBuilder.Append(this.GetMemberValue(member.Value));
}
else
{
throw new InvalidOperationException();
}
}
else
{
blockBuilder.Append(match.Match.Value);
}
break;
case BlockType.If:
if (blockStates.Count == 0)
{
ifParameters.Clear();
blockBuilder = new StringBuilder();
var member = match.Match.Groups["member"];
var value = match.Match.Groups["value"];
var parameter = new IfParameter();
parameter.Member = this.GetMemberValue(member.Value);
parameter.Value = value.Success ? value.Value.UnescapeValue() : null;
parameter.IsElse = false;
ifParameters.Add(parameter);
}
else
{
blockBuilder.Append(match.Match.Value);
}
blockStates.Push(BlockState.If);
break;
case BlockType.ElseIf:
if (blockStates.Count == 0 || blockStates.Peek() != BlockState.If)
{
throw new ConstructionException();
}
else if (blockStates.Count == 1)
{
ifParameters.Last().Block = blockBuilder.ToString();
blockBuilder = new StringBuilder();
var member = match.Match.Groups["member"];
var value = match.Match.Groups["value"];
var parameter = new IfParameter();
parameter.Member = this.GetMemberValue(member.Value);
parameter.Value = value.Success ? value.Value.UnescapeValue() : null;
parameter.IsElse = false;
ifParameters.Add(parameter);
}
else
{
blockBuilder.Append(match.Match.Value);
}
break;
case BlockType.Else:
if (blockStates.Count == 0 || blockStates.Peek() != BlockState.If)
{
throw new ConstructionException();
}
else if (blockStates.Count == 1)
{
ifParameters.Last().Block = blockBuilder.ToString();
blockBuilder = new StringBuilder();
var parameter = new IfParameter();
parameter.Member = null;
parameter.Value = null;
parameter.IsElse = true;
ifParameters.Add(parameter);
}
else
{
blockBuilder.Append(match.Match.Value);
}
break;
case BlockType.EndIf:
if (blockStates.Count == 0 || blockStates.Peek() != BlockState.If)
{
throw new ConstructionException();
}
else if (blockStates.Count == 1)
{
ifParameters.Last().Block = blockBuilder.ToString();
blockBuilder = null;
foreach (var ifParameter in ifParameters)
{
var matched = false;
if (ifParameter.IsElse)
{
matched = true;
}
else if (ifParameter.Value == null)
{
if (ifParameter.Member != null &&
!ifParameter.Member.Equals(ifParameter.Member.GetType().GetDefault()))
{
matched = true;
}
}
else
{
if (ifParameter.Member != null &&
ifParameter.Member.ToString() == ifParameter.Value)
{
matched = true;
}
}
if (matched)
{
var parser = new BlockParser(this.Context, this.Name, this._parsers);
resultBuilder.Append(parser.Parse(ifParameter.Block));
break;
}
}
}
else
{
blockBuilder.Append(match.Match.Value);
}
blockStates.Pop();
break;
case BlockType.For:
if (blockStates.Count == 0)
{
blockBuilder = new StringBuilder();
var item = match.Match.Groups["item"];
var list = match.Match.Groups["list"];
forItem = item.Value;
forMembers = this.GetMemberValue(list.Value) as System.Collections.IEnumerable;
}
else
{
blockBuilder.Append(match.Match.Value);
}
blockStates.Push(BlockState.For);
break;
case BlockType.EndFor:
if (blockStates.Count == 0 || blockStates.Peek() != BlockState.For)
{
throw new ConstructionException();
}
else if (blockStates.Count == 1)
{
if (forMembers != null)
{
var forBlock = blockBuilder.ToString();
var members = new List <object>();
foreach (var forMember in forMembers)
{
members.Add(forMember);
}
for (var i = 0; i < members.Count; i++)
{
var parsers = this._parsers.ToList();
parsers.Add(this);
var context = new ParserContext(members[i]);
context.Dictionary["IsFirst"] = i == 0;
context.Dictionary["IsLast"] = i == members.Count - 1;
context.Dictionary["ForIndex"] = i;
context.Dictionary["ForCount"] = members.Count;
var parser = new BlockParser(context, forItem, parsers);
resultBuilder.Append(parser.Parse(forBlock));
}
}
}
else
{
blockBuilder.Append(match.Match.Value);
}
blockStates.Pop();
break;
default:
throw new NotSupportedException();
}
}
}
