AFAICT, everything is behaving as specified. I suggest you look at the parses by throwing
:default ::= action => [name,values]
into the grammar, and then adding a dump of the values
while (my $value = $recce->value()) {
print "Value: ",Dumper($value);
}
I assume they do *not* match what you intended, otherwise you wouldn't be posing the question. My suggestion -- before working with events, using dumps of the parse trees to ensure that your parse trees look like what you think they should look like. Then add the events.
As a guess at where the grammar is departing from your intention, "Notation ::= L argRule", requires the <L> to be followed by an <argRule>. The <argRule> is being recognized as a <Presentation>, and this is eating up the second "<mi>L</mi>", so that it does not form part of a <Notation>. All this might be clearer from a dump than it is from my explanation.
I hope this helps, jeffrey On 08/06/2014 03:28 PM, Ion Toloaca wrote:
Hello everyone!I would be very thankful if someone would help me understand what happens in my code,which I have been failing to do for quite a few days. Here is the simplified version of the grammar I'm working on. https://github.com/itoloaca/Notation-Based-Parsing/blob/master/My_Grammar.pm and this is the code that uses it can be found here: https://github.com/itoloaca/Notation-Based-Parsing/blob/master/test123.pl The input is: "<mrow><mi>L</mi><mi>L</mi></mrow>" The output is: Actual events: $VAR1 = [ [ 16, 10, 'Notation' ] ]; Which means that 'Notation' was found only as the second <mi>L</mi>,while I would expect [ [6, 20]] - meaning the 2 symbols <mi>L</mi><mi>L</mi>.There are a lot of peculiarities I found - for example replacing argRule with Expr makes it work right, also removing <mrow> tags or even simply switching the orderof the elements of "Notation ::= L argRule" to "Notation::= argRule L" makes it once again work right.Since using events is a basic point in my project - I can't help but wonder what is that I don't know about the way these work that triggers these strange phenomena. Therefore, please help me understand events (a link to an appropriate tutorial wouldbe nice... I just can't figure it out from the documentation). Thank you in advance for your help. Best regards, Toloaca Ion --You received this message because you are subscribed to the Google Groups "marpa parser" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected] <mailto:[email protected]>.For more options, visit https://groups.google.com/d/optout.
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