public bool ParseValid(string text)
{
//var inputStream = new StreamReader(Console.OpenStandardInput());
var input = new AntlrInputStream(text);
var lexer = new DOTLexer(input);
var tokens = new CommonTokenStream(lexer);
var parser = new DOTParser(tokens);
parser.RemoveErrorListeners();
var errorListener = new ErrorListener(_errorHandler);
parser.AddErrorListener(errorListener);
IParseTree tree = parser.graph();
var tmp = tree.ToStringTree(parser);
// Console.WriteLine(tree.ToStringTree(parser));
// CalculatorVisitor visitor = new CalculatorVisitor();
// Console.WriteLine(visitor.Visit(tree));
return(!errorListener.HasParserErrors);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
var routeBuilder = new RouteBuilder(app);
routeBuilder.MapPost("parse", context =>
{
string text = "";
using (StreamReader reader = new StreamReader(context.Request.Body))
{
text = reader.ReadToEnd();
}
AntlrInputStream inputStream = new AntlrInputStream(text);
DOTLexer lexer = new DOTLexer(inputStream);
CommonTokenStream commonTokenStream = new CommonTokenStream(lexer);
DOTParser parser = new DOTParser(commonTokenStream);
// the listener gathers the names for the hover information
DOTLanguageListener listener = new DOTLanguageListener();
DOTErrorListener errorListener = new DOTErrorListener();
DOTLexerErrorListener lexerErrorListener = new DOTLexerErrorListener();
lexer.RemoveErrorListeners();
lexer.AddErrorListener(lexerErrorListener);
parser.RemoveErrorListeners();
parser.AddErrorListener(errorListener);
GraphContext graph = parser.graph();
ParseTreeWalker.Default.Walk(listener, graph);
StringBuilder json = new StringBuilder();
json.Append("{");
json.Append("\"errors\": [");
json.Append(convertMessagesToJson(lexerErrorListener.Messages));
json.Append(convertMessagesToJson(errorListener.Messages));
if (lexerErrorListener.Messages.Count + errorListener.Messages.Count > 0)
{
json.Remove(json.Length - 2, 1);
}
json.Append("], ");
json.Append("\"names\": [");
json.Append(convertNamesToJson(listener.Names));
json.Append("]");
json.Append("}");
return(context.Response.WriteAsync(json.ToString()));
});
var routes = routeBuilder.Build();
app.UseRouter(routes);
}