private static StartEventPropertyRuleContext HandleRecognitionEx(
RecognitionException e,
CommonTokenStream tokens,
string propertyName,
EsperEPL2GrammarParser g)
{
// Check for keywords and escape each, parse again
var escapedPropertyName = EscapeKeywords(tokens);
var inputEscaped = new CaseInsensitiveInputStream(escapedPropertyName);
var lexEscaped = ParseHelper.NewLexer(inputEscaped);
var tokensEscaped = new CommonTokenStream(lexEscaped);
var gEscaped = ParseHelper.NewParser(tokensEscaped);
try {
return(gEscaped.startEventPropertyRule());
}
catch {
// ignored
}
throw ExceptionConvertor.ConvertProperty(e, propertyName, true, g);
}
/// <summary>
/// Parse expression using the rule the ParseRuleSelector instance supplies.
/// </summary>
/// <param name="expression">text to parse</param>
/// <param name="parseRuleSelector">parse rule to select</param>
/// <param name="addPleaseCheck">true to include depth paraphrase</param>
/// <param name="eplStatementErrorMsg">text for error</param>
/// <param name="rewriteScript">whether to rewrite script expressions</param>
/// <returns>AST - syntax tree</returns>
/// <throws>EPException when the AST could not be parsed</throws>
/// <throws>StatementSpecCompileSyntaxException syntax exceptions</throws>
public static ParseResult Parse(
string expression,
string eplStatementErrorMsg,
bool addPleaseCheck,
ParseRuleSelector parseRuleSelector,
bool rewriteScript)
{
if (Log.IsDebugEnabled)
{
Log.Debug(".parse Parsing expr=" + expression);
}
var input = new CaseInsensitiveInputStream(expression);
var lex = NewLexer(input);
var tokens = new CommonTokenStream(lex);
var parser = ParseHelper.NewParser(tokens);
ITree tree;
try
{
tree = parseRuleSelector.InvokeParseRule(parser);
}
catch (RecognitionException ex)
{
tokens.Fill();
if (rewriteScript)
{
if (IsContainsScriptOrClassExpression(tokens))
{
return HandleScriptAndClassRewrite(tokens, eplStatementErrorMsg, addPleaseCheck, parseRuleSelector);
}
}
Log.Debug("Error parsing statement [" + expression + "]", ex);
throw ExceptionConvertor.ConvertStatement(ex, eplStatementErrorMsg, addPleaseCheck, parser);
}
catch (Exception e)
{
try
{
tokens.Fill();
}
catch (Exception)
{
Log.Debug("Token-fill produced exception: " + e.Message, e);
}
if (Log.IsDebugEnabled)
{
Log.Debug("Error parsing statement [" + eplStatementErrorMsg + "]", e);
}
if (e.InnerException is RecognitionException recognitionException)
{
if (rewriteScript)
{
if (IsContainsScriptOrClassExpression(tokens))
{
return HandleScriptAndClassRewrite(tokens, eplStatementErrorMsg, addPleaseCheck, parseRuleSelector);
}
}
throw ExceptionConvertor.ConvertStatement(recognitionException, eplStatementErrorMsg, addPleaseCheck, parser);
}
throw;
}
// if we are re-writing scripts and contain a script, then rewrite
if (rewriteScript && IsContainsScriptOrClassExpression(tokens))
{
return HandleScriptAndClassRewrite(tokens, eplStatementErrorMsg, addPleaseCheck, parseRuleSelector);
}
if (Log.IsDebugEnabled)
{
Log.Debug(".parse Dumping AST...");
ASTUtil.DumpAST(tree);
}
var expressionWithoutAnnotation = expression;
if (tree is EsperEPL2GrammarParser.StartEPLExpressionRuleContext)
{
var epl = (EsperEPL2GrammarParser.StartEPLExpressionRuleContext) tree;
expressionWithoutAnnotation = GetNoAnnotation(expression, epl.annotationEnum(), tokens);
}
return new ParseResult(
tree,
expressionWithoutAnnotation,
tokens,
EmptyList<string>.Instance,
EmptyList<string>.Instance);
}
