public Grammar Read(IGrammarSource source, ILogging logging)
{
var cilSource = source as CilGrammarSource;
if (cilSource == null)
{
return(null);
}
this.logging = logging;
CilGrammar definition = null;
logging.WithTimeLogging(
cilSource.LanguageName,
cilSource.Origin,
() =>
{
definition = new CilGrammar(cilSource, logging);
},
"parsing language definition");
if (definition == null || !definition.IsValid)
{
return(null);
}
var grammar = BuildGrammar(definition);
grammar.Options = (IronText.Reflection.RuntimeOptions)Attributes.First <LanguageAttribute>(cilSource.DefinitionType).Flags;
return(grammar);
}
private static Grammar BuildGrammar(CilGrammar definition)
{
var result = new Grammar();
InitContextProvider(
result,
definition.GlobalContextProvider,
result.GlobalContextProvider);
var symbolResolver = definition.SymbolResolver;
// Define grammar tokens
foreach (var cilSymbol in symbolResolver.Definitions)
{
Symbol symbol;
if (cilSymbol.Type == typeof(Exception))
{
cilSymbol.Symbol = symbol = (Symbol)result.Symbols[PredefinedTokens.Error];
symbol.Joint.Add(
new CilSymbol
{
Type = typeof(Exception),
Symbol = symbol,
Categories = SymbolCategory.DoNotDelete | SymbolCategory.DoNotInsert
});
}
else
{
symbol = new Symbol(cilSymbol.Name)
{
Categories = cilSymbol.Categories,
Joint = { cilSymbol }
};
result.Symbols.Add(symbol);
cilSymbol.Symbol = symbol;
}
}
foreach (CilSymbolFeature <Precedence> feature in definition.Precedence)
{
var symbol = symbolResolver.GetSymbol(feature.SymbolRef);
symbol.Precedence = feature.Value;
}
foreach (CilSymbolFeature <CilContextProvider> feature in definition.LocalContextProviders)
{
var symbol = symbolResolver.GetSymbol(feature.SymbolRef);
if (symbol != null)
{
InitContextProvider(result, feature.Value, symbol.LocalContextProvider);
}
}
result.Start = symbolResolver.GetSymbol(definition.Start);
// Define grammar rules
foreach (var cilProduction in definition.Productions)
{
Symbol outcome = symbolResolver.GetSymbol(cilProduction.Outcome);
var pattern = Array.ConvertAll(cilProduction.Pattern, symbolResolver.GetSymbol);
// Try to find existing rules whith same token-signature
Production production;
if (result.Productions.FindOrAdd(outcome, pattern, out production))
{
ForeignContextRef contextRef = CreateActionContextRef(cilProduction.Context);
production.Actions.Add(new ForeignAction(pattern.Length, contextRef));
}
var action = production.Actions[0];
action.Joint.Add(cilProduction);
production.ExplicitPrecedence = cilProduction.Precedence;
}
// Create conditions to allow referencing them from matchers
foreach (CilCondition cilCondition in definition.Conditions)
{
var cond = CreateCondtion(result, cilCondition);
result.Conditions.Add(cond);
}
// Create matchers
foreach (CilCondition cilCondition in definition.Conditions)
{
var condition = ConditionFromType(result, cilCondition.ConditionType);
foreach (var cilMatcher in cilCondition.Matchers)
{
SymbolBase outcome = GetMatcherOutcomeSymbol(result, symbolResolver, cilMatcher.MainOutcome, cilMatcher.AllOutcomes);
var matcher = new Matcher(
cilMatcher.Pattern,
outcome,
#if false
context: CreateActionContextRef(cilMatcher.Context),
#endif
nextCondition: ConditionFromType(result, cilMatcher.NextConditionType),
disambiguation: cilMatcher.Disambiguation);
matcher.Joint.Add(cilMatcher);
condition.Matchers.Add(matcher);
}
}
foreach (var cilMerger in definition.Mergers)
{
var symbol = symbolResolver.GetSymbol(cilMerger.Symbol);
var merger = new Merger(symbol)
{
Joint = { cilMerger }
};
result.Mergers.Add(merger);
}
foreach (var report in definition.Reports)
{
result.Reports.Add(report);
}
return(result);
}