private static ExpressionResult CompileQuery(string query, Expression context, ISchemaProvider schemaProvider, IMethodProvider methodProvider, QueryVariables variables)
{
AntlrInputStream stream = new AntlrInputStream(query);
var lexer = new EntityGraphQLLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new EntityGraphQLParser(tokens);
parser.BuildParseTree = true;
var tree = parser.startRule();
var visitor = new QueryGrammerNodeVisitor(context, schemaProvider, methodProvider, variables);
var expression = visitor.Visit(tree);
return expression;
}
private static ExpressionResult CompileQuery(string query, Expression context, ISchemaProvider schemaProvider, ClaimsIdentity claims, IMethodProvider methodProvider, QueryVariables variables)
{
AntlrInputStream stream = new AntlrInputStream(query);
var lexer = new EntityGraphQLLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new EntityGraphQLParser(tokens)
{
BuildParseTree = true
};
var tree = parser.eqlStart();
var visitor = new EntityQueryNodeVisitor(context, schemaProvider, methodProvider, variables, claims);
var expression = visitor.Visit(tree);
return(expression);
}
public IGraphQLNode Compile(QueryRequest request)
{
// Setup our Antlr parser
var stream = new AntlrInputStream(request.Query);
var lexer = new EntityGraphQLLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new EntityGraphQLParser(tokens);
parser.BuildParseTree = true;
parser.ErrorHandler = new BailErrorStrategy();
try
{
var tree = parser.graphQL();
var visitor = new GraphQLVisitor(_schemaProvider, _methodProvider, request.Variables);
// visit each node. it will return a linq expression for each entity requested
var node = visitor.Visit(tree);
return(node);
}
catch (ParseCanceledException pce)
{
if (pce.InnerException != null)
{
if (pce.InnerException is NoViableAltException)
{
var nve = (NoViableAltException)pce.InnerException;
throw new EntityGraphQLCompilerException($"Error: line {nve.OffendingToken.Line}:{nve.OffendingToken.Column} no viable alternative at input '{nve.OffendingToken.Text}'");
}
else if (pce.InnerException is InputMismatchException)
{
var ime = (InputMismatchException)pce.InnerException;
var expecting = string.Join(", ", ime.GetExpectedTokens());
throw new EntityGraphQLCompilerException($"Error: line {ime.OffendingToken.Line}:{ime.OffendingToken.Column} extraneous input '{ime.OffendingToken.Text}' expecting {expecting}");
}
System.Console.WriteLine(pce.InnerException.GetType());
throw new EntityGraphQLCompilerException(pce.InnerException.Message);
}
throw new EntityGraphQLCompilerException(pce.Message);
}
}