public void Emit(SourceBuilder source, SequenceGenerator seqGen, bool fireDebugEvents)
{
String matchListName = "MatchList_" + seqMulti.Id;
source.AppendFrontFormat("List<GRGEN_LIBGR.IMatch> {0} = new List<GRGEN_LIBGR.IMatch>();\n", matchListName);
// emit code for matching all the contained rules
for (int i = 0; i < seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences.Count; ++i)
{
new SequenceMultiSequenceBacktrackRuleGenerator(seqMulti,
seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences[i].Rule,
seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences[i].Sequence,
seqExprGen, seqHelper)
.EmitMatching(source, seqGen, matchListName);
}
// emit code for match class (non-rule-based) filtering
foreach (SequenceFilterCall sequenceFilterCall in seqMulti.MultiRulePrefixedSequence.Filters)
{
seqExprGen.EmitMatchClassFilterCall(source, (SequenceFilterCallCompiled)sequenceFilterCall, matchListName, false);
}
source.AppendFront("if(" + matchListName + ".Count == 0) {\n");
source.Indent();
source.AppendFront(COMP_HELPER.SetResultVar(seqMulti, "false"));
source.Unindent();
source.AppendFront("} else {\n");
source.Indent();
source.AppendFront(COMP_HELPER.SetResultVar(seqMulti, "true")); // shut up compiler
String originalToCloneName = "originalToClone_" + seqMulti.Id;
source.AppendFrontFormat("Dictionary<GRGEN_LIBGR.IMatch, GRGEN_LIBGR.IMatch> {0} = new Dictionary<GRGEN_LIBGR.IMatch, GRGEN_LIBGR.IMatch>();\n", originalToCloneName);
// emit code for cloning the matches objects of the rules
for (int i = 0; i < seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences.Count; ++i)
{
new SequenceMultiSequenceBacktrackRuleGenerator(seqMulti,
seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences[i].Rule,
seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences[i].Sequence,
seqExprGen, seqHelper)
.EmitCloning(source, seqGen, matchListName, originalToCloneName);
}
String originalMatchList = "originalMatchList_" + seqMulti.Id;
source.AppendFrontFormat("List<GRGEN_LIBGR.IMatch> {0} = new List<GRGEN_LIBGR.IMatch>({1});\n", originalMatchList, matchListName);
source.AppendFrontFormat("{0}.Clear();\n", matchListName);
String originalMatch = "originalMatch_" + seqMulti.Id;
source.AppendFrontFormat("foreach(GRGEN_LIBGR.IMatch {0} in {1})\n", originalMatch, originalMatchList);
source.AppendFrontIndentedFormat("{0}.Add({1}[{2}]);", matchListName, originalToCloneName, originalMatch);
// apply the rules and the following sequence for every match found,
// until the first rule and sequence execution succeeded
// rolling back the changes of failing executions until then
String enumeratorName = "enum_" + seqMulti.Id;
String matchesTriedName = "matchesTried_" + seqMulti.Id;
source.AppendFront("int " + matchesTriedName + " = 0;\n");
source.AppendFront("IEnumerator<GRGEN_LIBGR.IMatch> " + enumeratorName + " = " + matchListName + ".GetEnumerator();\n");
source.AppendFront("while(" + enumeratorName + ".MoveNext())\n");
source.AppendFront("{\n");
source.Indent();
source.AppendFront("++" + matchesTriedName + ";\n");
String transactionIdName = "transID_" + seqMulti.Id;
source.AppendFront("int " + transactionIdName + " = procEnv.TransactionManager.Start();\n");
String oldRewritesPerformedName = "oldRewritesPerformed_" + seqMulti.Id;
source.AppendFront("int " + oldRewritesPerformedName + " = procEnv.PerformanceInfo.RewritesPerformed;\n");
source.AppendFront("switch(" + enumeratorName + ".Current.Pattern.PackagePrefixedName)\n");
source.AppendFront("{\n");
source.Indent();
// emit code for rewriting the current match (for each rule, rule fitting to the match is selected by rule name)
// and code for executing the corresponding sequence
for (int i = 0; i < seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences.Count; ++i)
{
new SequenceMultiSequenceBacktrackRuleGenerator(seqMulti,
seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences[i].Rule,
seqMulti.MultiRulePrefixedSequence.RulePrefixedSequences[i].Sequence,
seqExprGen, seqHelper)
.EmitRewriting(source, seqGen, matchListName, enumeratorName, fireDebugEvents);
}
source.AppendFrontFormat("default: throw new Exception(\"Unknown pattern \" + {0}.Current.Pattern.PackagePrefixedName + \" in match!\");", enumeratorName);
source.Unindent();
source.AppendFront("}\n");
// if sequence execution failed, roll the changes back and try the next match
source.AppendFront("if(!" + COMP_HELPER.GetResultVar(seqMulti) + ") {\n");
source.Indent();
source.AppendFront("procEnv.TransactionManager.Rollback(" + transactionIdName + ");\n");
source.AppendFront("procEnv.PerformanceInfo.RewritesPerformed = " + oldRewritesPerformedName + ";\n");
source.AppendFront("if(" + matchesTriedName + " < " + matchListName + ".Count) {\n"); // further match available -> try it
source.Indent();
source.AppendFront("continue;\n");
source.Unindent();
source.AppendFront("} else {\n"); // all matches tried, all failed later on -> end in fail
source.Indent();
source.AppendFront("break;\n");
source.Unindent();
source.AppendFront("}\n");
source.Unindent();
source.AppendFront("}\n");
// if sequence execution succeeded, commit the changes so far and succeed
source.AppendFront("procEnv.TransactionManager.Commit(" + transactionIdName + ");\n");
source.AppendFront("break;\n");
source.Unindent();
source.AppendFront("}\n");
source.Unindent();
source.AppendFront("}\n");
}