C# AntlrInputStream error ?

[Ghislain Benrais]

Hello,
I have an issue when running this :

StreamReader sr = new StreamReader(filePath);
AntlrInputStream input = new AntlrInputStream(sr);

The program hangs forever on line 2.
For your information, if I use the string constructor, it works :

StreamReader sr = new StreamReader(source);
AntlrInputStream input = new AntlrInputStream(sr.ReadToEnd());

Thanks for your help,
Ghislain

[Greg D]

Until you get a more authoritative response, you might try:

ANTLRFileStream input = new ANTLRFileStream(filePath);

[Ghislain Benrais]

Thanks Greg but my goal is to parse the content of the file

[Sam Harwell]

Hi Ghislain,

 

The second constructor you used is implemented with the following assignment:

 

this.data = input.ToCharArray();

 

The first constructor you used is implemented with the following assignment:

 

data = r.ReadToEnd().ToCharArray();

 

Since they are clearly the same, the difference in your program must have to do with the “filePath” vs. the “source” variables in your code.

 

Thanks,

Sam

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[Ghislain Benrais]

Hello Sam (by the way I'm glad to meet you and tell you thanks a LOT for your useful answers about ANTLR),
As I have to read large files (100MB), I tried the following program :

           StreamReader sr = new StreamReader(source);

            UnbufferedCharStream input = new UnbufferedCharStream(sr);
            qbridgeLexer lexer = new qbridgeLexer(input);
            CommonTokenStream tokens = new CommonTokenStream(lexer);
            qbridgeParser parser = new qbridgeParser(tokens);
            IParseTree tree = parser.qbridge();
            ParseTreeWalker walker = new ParseTreeWalker();
            QbridgeLoader loader = new QbridgeLoader(_document);
            walker.Walk(loader, tree);

It failed with exception 'Unbuffered stream cannot know its size'.

I also tried without success this program :

            StreamReader sr = new StreamReader(source);

            UnbufferedCharStream input = new UnbufferedCharStream(sr);
            qbridgeLexer lexer = new qbridgeLexer(input);
            UnbufferedTokenStream tokens = new UnbufferedTokenStream(lexer);
            qbridgeParser parser = new qbridgeParser(tokens);
            parser.BuildParseTree = false;
            IParseTree tree = parser.qbridge();
            ParseTreeWalker walker = new ParseTreeWalker();
            QbridgeLoader loader = new QbridgeLoader(_document);
            walker.Walk(loader, tree);

I am actually parsing tables of figures which are independent, so I am about to parse them separately, unless there is something more straightforward.
Thanks,
Ghislain