Inching along in my work on
https://core.tcl.tk/akupries/marpa/timeline
I have come across a weirdness/bogosity regarding the retrieval of the
valuation instructions (steps) from a `Marpa_Value`.
First, on the good side, the relevant method (get-parse) in the bocage
glue class [1] works just fine. Whether for the lexer or the parser, I
properly get all the steps (tokens, rules, nullings, etc).
On the other hand, in the structurally identical functions for the
C-level runtime I am now working on (lexer [2], parser [3]) I see only
2 types of step types: "token" and "inactive". Rule and nulling steps
are missing (and I placed the TRACE commands such that I really should
see everything coming out of `marpa_v_step`).
I have no idea what is going with the Marpa_Value. I actually can see
where in the list of steps the rules should show up, by looking at the
stack locations coming with the token steps. I.e. I see token(value)s
getting pushed on the stack, dst-slot increasing and then a token
suddenly writes into the middle instead of the top. Implying that at
least one rule is in between them, doing reductions. But that rule
instruction was not returned by `marpa_v_step`.
I am pretty sure that the grammar and recognizer are correct, simply
because I do get the proper lexemes out of the system [4] instead of a
parse error.
Anybody with an idea what I might be doing wrong ?
[1] https://core.tcl.tk/akupries/marpa/artifact/b840a1e9de9c9e42?ln=130-274
[2] https://core.tcl.tk/akupries/marpa/artifact/b28b552a320a424d?ln=383-464
[3] https://core.tcl.tk/akupries/marpa/artifact/ab0d46ff4344c06e?ln=162-288
[4] At the lexer level the token steps alone are good enough to at
least know that.
--
See you,
Andreas Kupries <[email protected]>
<http://core.tcl.tk/akupries/>
Developer @ SUSE (MicroFocus Canada LLC)
<[email protected]>
Tcl'2017, Oct 16-20, Houston, TX, USA. http://www.tcl.tk/community/tcl2017/
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