public bool CanHandleTok(Token token, bool isCurrent)
{
List<CompilerPlugin> plugins = null;
// Case 1: Can not overtake identifiers that are actually variables(symbols) in current scope.
if (token.Kind == TokenKind.Ident && this.Symbols != null && this.Symbols.Contains(token.Text))
return false;
// Case 2: Ident - specific word
if (token.Kind == TokenKind.Ident && _pluginTokens.ContainsKey(token.Text))
{
plugins = _pluginTokens[token.Text];
}
// Case 3: General symbol e.g. $Ident $DateToken $Time
else if(token.Kind == TokenKind.LiteralDate)
{
if (_pluginTokens.ContainsKey("$DateToken"))
plugins = _pluginTokens["$DateToken"];
}
if (plugins == null)
return false;
_matchTokenResult = new MatchResult(false, null, null);
foreach (var plugin in plugins)
{
if (string.IsNullOrEmpty(plugin.Grammar))
{
var tokenPlugin = plugin.Handler as TokenReplacePlugin;
tokenPlugin.TokenIt = this.TokenIt;
if (tokenPlugin.CanHandle(token, isCurrent))
{
_matchTokenResult = new MatchResult(true, plugin, null);
this.LastMatchedTokenPlugin = tokenPlugin;
break;
}
}
else
{
var result = IsGrammarMatch(plugin);
if(result.Success)
{
_matchTokenResult = result;
break;
}
}
}
return _matchTokenResult.Success;
}
/// <summary>
/// Register the compiler plugin.
/// </summary>
/// <param name="plugin"></param>
public void Register(CompilerPlugin plugin)
{
_allPlugins.Add(plugin);
if (plugin.PluginType == "expr" && plugin.StartTokens.Length > 0)
{
foreach (var startToken in plugin.StartTokens)
{
var tokenPlugins = _pluginExprs.ContainsKey(startToken)
? _pluginExprs[startToken]
: new List<CompilerPlugin>();
tokenPlugins.Add(plugin);
_pluginExprs[startToken] = tokenPlugins;
}
}
else if(plugin.PluginType == "token" )
{
var tplugin = new TokenReplacePlugin();
var hasStartTokens = plugin.StartTokens != null && plugin.StartTokens.Length > 0;
var list = new List<CompilerPlugin>();
plugin.Handler = tplugin;
list.Add(plugin);
if( hasStartTokens )
{
foreach(var startToken in plugin.StartTokens)
{
_pluginTokens[startToken] = list;
}
}
if (plugin.TokenReplacements != null && plugin.TokenReplacements.Count > 0)
{
foreach (var replacements in plugin.TokenReplacements)
{
var alias = replacements[0];
var replaceWith = replacements[1];
tplugin.SetupReplacement(alias, replaceWith);
if(!hasStartTokens)
{
_pluginTokens[alias] = list;
}
}
}
}
}