private void SetRuleParamsInfo(Rule rule, RuleExpression.RuleUsage ruleUsage)
{
var ruleArgsInfo = rule.GetEntities().OfType <RuleParameter>().ToArray();
if (ruleArgsInfo.Length != ruleUsage.Arguments.Count)
{
throw new InvalidOperationException(string.Format("Trying to call rule [{0}] with [{1}] parameters!", rule.ToString(), ruleUsage.Arguments.Count));
}
for (int i = 0; i < ruleArgsInfo.Length; i++)
{
_nav.SetParamExpression(ruleArgsInfo[i], ruleUsage.Arguments[i]);
}
}
private GraphContext FindRuleRecursiveInvocationNode(Rule rule, RuleExpression.RuleUsage ruleUsage)
{
GraphContext entryContext = null;
for (var c = _currContext.parentContext; c != null; c = c.parentContext)
{
//var a = ruleUsage.Arguments;
//var g = c.expression.ToString();
//var b = c.rule.GetEntities().OfType<RuleExpression.RuleUsage>().ToArray();
if (c.rule == rule && c.parentContext.rule != rule && ruleUsage.ToString() == c.parentContext.expression.ToString())
{
entryContext = c;
break;
}
}
return(entryContext);
}
internal RecursiveParserNode(Rule rule, RuleExpression.RuleUsage targetCallExpr)
: base(rule, null)
{
this.Target = null;
this.TargetCallExpr = targetCallExpr;
}
void IRuleExpressionVisitor.VisitRuleUsage(RuleExpression.RuleUsage ruleUsage)
{
if (_currContext.invocationCount == 0)
{
// _log.WriteLine("entering from [{0}] to [{1}]", _currContext.rule == null ? "<NULL>" : _currContext.rule.Name, ruleUsage.RuleName).Push();
RuleExpression expr;
if (_nav.TryEnterParameterContext(ruleUsage.RuleName, out expr))
{
_currContext = _currContext.ForChildExpression(expr, _nav.CurrRuleInfo.Rule);
}
else
{
GrammarNavigator.RuleInfo ruleInfo;
//if (!_nav.TryResolveRule(ruleUsage.RuleName, out ruleInfo))
if (!_nav.TryEnterRule(ruleUsage.RuleName, out ruleInfo))
{
throw new InvalidOperationException(string.Format("Referenced rule [{0}] not found!", ruleUsage.RuleName));
}
var rule = ruleInfo.IsExplicitRule ? ruleInfo.Rule : this.ExpandExtensibleRule(ruleInfo);
RuleExpression expression;
if (this.TryRewriteRecursionCalls(rule, out expression))
{
ParserNode recursiveTargetNode;
if (_cachedMaterializedRewritedRuleEnterByPath.TryGetValue(ruleInfo.NamePath, out recursiveTargetNode))
{
_nav.Exit();
var node = new ParserNode.RecursiveParserNode(rule, ruleUsage);
node.SetTarget(recursiveTargetNode);
_currContext = _currContext.ForParentExpression(node);
return;
}
}
this.SetRuleParamsInfo(rule, ruleUsage);
var entryContext = this.FindRuleRecursiveInvocationNode(rule, ruleUsage);
if (entryContext != null)
{
//_log.WriteLine("recursively exiting from [{0}] to [{1}]", ruleUsage.RuleName, _currContext.rule.Name).Pop();
_nav.Exit();
var node = new ParserNode.RecursiveParserNode(rule, ruleUsage);
_recursiveNodes.Add(node);
_currContext = _currContext.ForParentExpression(node);
}
else
{
_currContext = _currContext.ForChildExpression(expression, rule);
}
// _nav.Enter(ruleUsage.RuleName);
}
}
else if (_currContext.invocationCount == 1)
{
if (_currContext.childEntries.node == null ||
_currContext.childEntries.prev != null)
{
throw new InvalidOperationException();
}
var ruleNamePath = _nav.CurrRuleInfo.NamePath;
//_log.WriteLine("exiting from [{0}] to [{1}]", ruleUsage.RuleName, _currContext.rule.Name).Pop();
_nav.Exit();
var node = new ParserNode.RuleCall(
_currContext.rule, _currContext.expression, _currContext.childEntries.node
);
if (!_cachedMaterializedRewritedRuleEnterByPath.ContainsKey(ruleNamePath))
{
_cachedMaterializedRewritedRuleEnterByPath.Add(ruleNamePath, node);
}
_currContext = _currContext.ForParentExpression(node);
}
else
{
throw new InvalidOperationException();
}
}