public static EqlResult CompileWith(string query, Expression context, ISchemaProvider schemaProvider, IMethodProvider _methodProvider)
{
AntlrInputStream stream = new AntlrInputStream(query);
var lexer = new EqlGrammerLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new EqlGrammerParser(tokens);
parser.BuildParseTree = true;
var tree = parser.startRule();
var visitor = new EqlGrammerVisitor(context, schemaProvider, _methodProvider);
var expression = visitor.Visit(tree);
return(new EqlResult(Expression.Lambda(expression)));
}
/// Parses a GraphQL-like query syntax into a tree respresenting the requested object graph. E.g.
/// {
/// entity/query {
/// field1,
/// field2,
/// relation { field }
/// },
/// ...
/// }
///
/// The returned DataQueryNode is a root node, it's Fields are the top level data queries
public DataApiNode Compile(string query)
{
// Setup our Antlr parser
var stream = new AntlrInputStream(query);
var lexer = new EqlGrammerLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new EqlGrammerParser(tokens);
parser.BuildParseTree = true;
parser.ErrorHandler = new BailErrorStrategy();
try
{
var tree = parser.dataQuery();
var visitor = new DataApiVisitor(_schemaProvider, _methodProvider, _relationHandler);
// 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 EqlCompilerException($"Error: line {nve.OffendingToken.Line}:{nve.OffendingToken.Column} no viable alternative at input '{nve.OffendingToken.Text}'");
}
else if (pce.InnerException is InputMismatchException)
{
var ime = (InputMismatchException)pce.InnerException;
var expecting = string.Join(", ", ime.GetExpectedTokens());
throw new EqlCompilerException($"Error: line {ime.OffendingToken.Line}:{ime.OffendingToken.Column} extraneous input '{ime.OffendingToken.Text}' expecting {expecting}");
}
System.Console.WriteLine(pce.InnerException.GetType());
throw new EqlCompilerException(pce.InnerException.Message);
}
throw new EqlCompilerException(pce.Message);
}
}
public static EqlResult Compile(string query, ISchemaProvider schemaProvider, IMethodProvider _methodProvider)
{
ParameterExpression contextParam = null;
if (schemaProvider != null)
{
contextParam = Expression.Parameter(schemaProvider.ContextType);
}
AntlrInputStream stream = new AntlrInputStream(query);
var lexer = new EqlGrammerLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new EqlGrammerParser(tokens);
parser.BuildParseTree = true;
var tree = parser.startRule();
var visitor = new EqlGrammerVisitor(contextParam, schemaProvider, _methodProvider);
var expression = visitor.Visit(tree);
return(new EqlResult(contextParam != null ? Expression.Lambda(expression, contextParam) : Expression.Lambda(expression)));
}
