| public AddParserError ( string message ) : void | ||
| message | string | |
| return | void | |
// Override this method to perform custom error processing
public virtual void ReportParseError(ParsingContext context)
{
string error = null;
if (context.CurrentParserInput.Term == this.SyntaxError)
{
error = context.CurrentParserInput.Token.Value as string; //scanner error
}
else if (context.CurrentParserInput.Term == this.Indent)
{
error = Resources.ErrUnexpIndent;
}
else if (context.CurrentParserInput.Term == this.Eof && context.OpenBraces.Count > 0)
{
if (context.OpenBraces.Count > 0)
{
//report unclosed braces/parenthesis
var openBrace = context.OpenBraces.Peek();
error = string.Format(Resources.ErrNoClosingBrace, openBrace.Text);
}
else
{
error = Resources.ErrUnexpEof;
}
}
else
{
var expectedTerms = context.GetExpectedTermSet();
error = ConstructParserErrorMessage(context, expectedTerms);
}
context.AddParserError(error);
}//method
public override Token TryMatch(ParsingContext context, ISourceStream source) {
string tokenText = string.Empty;
while (true) {
//Find next position
var newPos = source.Text.IndexOfAny(_stopChars, source.PreviewPosition);
if(newPos == -1) {
if(IsSet(FreeTextOptions.AllowEof)) {
source.PreviewPosition = source.Text.Length;
return source.CreateToken(this.OutputTerminal);
} else
return null;
}
if (newPos == source.PreviewPosition) // DC
{
context.AddParserError("(DC) in TryMatch, newPos == source.PreviewPosition", new object[] {});
break; // DC
}
tokenText += source.Text.Substring(source.PreviewPosition, newPos - source.PreviewPosition);
source.PreviewPosition = newPos;
//if it is escape, add escaped text and continue search
if (CheckEscape(source, ref tokenText))
continue;
//check terminators
if (CheckTerminators(source, ref tokenText))
break; //from while (true)
}
return source.CreateToken(this.OutputTerminal, tokenText);
}
public override void Execute(ParsingContext context)
{
if (context.TracingEnabled)
context.AddTrace(Resources.MsgTraceExecCustomAction);
//States with DefaultAction do NOT read input, so we read it here
if (context.CurrentParserInput == null)
context.Parser.ReadInput();
// Remember old state and input; if they don't change after custom action - it is error, we may fall into an endless loop
var oldState = context.CurrentParserState;
var oldInput = context.CurrentParserInput;
ExecuteRef(context, this);
//Prevent from falling into an infinite loop
if (context.CurrentParserState == oldState && context.CurrentParserInput == oldInput)
{
context.AddParserError(Resources.MsgErrorCustomActionDidNotAdvance);
context.Parser.RecoverFromError();
}
} //method
public override Token TryMatch(ParsingContext context, ISourceStream source)
{
string tokenText = string.Empty;
while (true)
{
//Find next position
var newPos = source.Text.IndexOfAny(_stopChars, source.PreviewPosition);
if (newPos == -1)
{
if (IsSet(FreeTextOptions.AllowEof))
{
source.PreviewPosition = source.Text.Length;
return(source.CreateToken(this.OutputTerminal));
}
else
{
return(null);
}
}
if (newPos == source.PreviewPosition) // DC
{
context.AddParserError("(DC) in TryMatch, newPos == source.PreviewPosition", new object[] {});
break; // DC
}
tokenText += source.Text.Substring(source.PreviewPosition, newPos - source.PreviewPosition);
source.PreviewPosition = newPos;
//if it is escape, add escaped text and continue search
if (CheckEscape(source, ref tokenText))
{
continue;
}
//check terminators
if (CheckTerminators(source, ref tokenText))
{
break; //from while (true)
}
}
return(source.CreateToken(this.OutputTerminal, tokenText));
}
public override void Execute(ParsingContext context)
{
var traceEnabled = context.TracingEnabled;
if (traceEnabled)
{
context.AddTrace("Conditional Parser Action.");
}
for (int i = 0; i < ConditionalEntries.Count; i++)
{
var ce = ConditionalEntries[i];
if (traceEnabled)
{
context.AddTrace(" Checking condition: " + ce.Description);
}
if (ce.Condition(context))
{
if (traceEnabled)
{
context.AddTrace(" Condition is TRUE, executing action: " + ce.Action.ToString());
}
ce.Action.Execute(context);
return;
}
}
//if no conditions matched, execute default action
if (DefaultAction == null)
{
context.AddParserError("Fatal parser error: no conditions matched in conditional parser action, and default action is null." +
" State: {0}", context.CurrentParserState.Name);
context.Parser.RecoverFromError();
return;
}
if (traceEnabled)
{
context.AddTrace(" All conditions failed, executing default action: " + DefaultAction.ToString());
}
DefaultAction.Execute(context);
} //method
public override void Execute(ParsingContext context)
{
if (context.TracingEnabled)
{
context.AddTrace(Resources.MsgTraceExecCustomAction);
}
//States with DefaultAction do NOT read input, so we read it here
if (context.CurrentParserInput == null)
{
context.Parser.ReadInput();
}
// Remember old state and input; if they don't change after custom action - it is error, we may fall into an endless loop
var oldState = context.CurrentParserState;
var oldInput = context.CurrentParserInput;
ExecuteRef(context, this);
//Prevent from falling into an infinite loop
if (context.CurrentParserState == oldState && context.CurrentParserInput == oldInput)
{
context.AddParserError(Resources.MsgErrorCustomActionDidNotAdvance);
context.Parser.RecoverFromError();
}
}//method
// Override this method to perform custom error processing
public virtual void ReportParseError(ParsingContext context)
{
string error = null;
if (context.CurrentParserInput.Term == this.SyntaxError)
error = context.CurrentParserInput.Token.Value as string; //scanner error
else if (context.CurrentParserInput.Term == this.Indent)
error = Resources.ErrUnexpIndent;
else if (context.CurrentParserInput.Term == this.Eof && context.OpenBraces.Count > 0) {
if (context.OpenBraces.Count > 0) {
//report unclosed braces/parenthesis
var openBrace = context.OpenBraces.Peek();
error = string.Format(Resources.ErrNoClosingBrace, openBrace.Text);
} else
error = Resources.ErrUnexpEof;
}else {
var expectedTerms = context.GetExpectedTermSet();
error = ConstructParserErrorMessage(context, expectedTerms);
}
context.AddParserError(error);
}
