/// <summary>
/// Handles the causing parse-request.
/// </summary>
/// <param name="req">The parse-request.</param>
protected virtual void HandleRequest(ParseRequest req)
{
// use full source text was in e.g. productions, we wan't to suggest productions which were specfied after the current position
string sourceText = req.Text;
if (string.IsNullOrEmpty(sourceText)) //HACK: empty source text makes problems for coco, so supply at least a whitespace
{
sourceText = " ";
}
CocoParseResult parseResult;
// we could do something like auto-parse when the source is parsed, highlight matched braces, get members, get quick info
// but we are only interested in code completions
switch (req.Reason)
{
case ParseReason.CompleteWord:
parseResult = CocoParserProxy.Parse(sourceText, req.Line, req.Col, Source.GetFilePath());
//this sets the possible declarations
CreateDeclarations(parseResult);
break;
case ParseReason.Goto:
parseResult = CocoParserProxy.Parse(sourceText, Source.GetFilePath());
//get selected text (text of selected token)
TokenInfo info = Source.GetTokenInfo(req.Line, req.Col);
string selectedText = Source.GetText(req.Line, info.StartIndex, req.Line, info.EndIndex + 1);
//look if there is a tokeninfo for this selected text
AddTokenInfo addInfo = FindTokenInfo(parseResult, selectedText);
TextSpan span = new TextSpan();
//when there is a tokeninfo for it, set the span where to navigate within the current file
if (addInfo != null)
{
int length = addInfo.Name == null ? 0 : addInfo.Name.Length;
span = new TextSpan();
span.iStartLine = span.iEndLine = addInfo.Line - 1;
span.iStartIndex = addInfo.Col - 1;
span.iEndIndex = addInfo.Col - 1 + length;
SourceSpanValid = true;
}
else
{
SourceSpanValid = false;
}
SourceSpan = span;
break;
default:
break;
}
}
private AddTokenInfo FindTokenInfo(CocoParserProxy.CocoParseResult result, string text)
{
AddTokenInfo info = null;
//search first in productions, then in tokens, then in charsets
info = result.Productions.FirstOrDefault(n => n.Name == text);
if (info != null)
{
return(info);
}
info = result.Tokens.FirstOrDefault(n => n.Name == text);
if (info != null)
{
return(info);
}
info = result.CharSets.FirstOrDefault(n => n.Name == text);
return(info);
}
