Opened 3 years ago

Last modified 2 years ago

#2602 assigned defect

Parser conflict resolve - scalarLit

Reported by: aburamadan Owned by: Dimitar Misev
Priority: major Milestone: 10.0
Component: qlparser Version: 10.0
Keywords: Cc: dmisev/pbaumann
Complexity: Medium

Description

note: for parser warnings and conflicts to be shown, use these bison flags:
“-r state –report-file=parserreport -t -W”.
The output file 'parserreport' is generated in the /qlparser dir.

-relevant state:

290 generalLit: scalarLit .
309 scalarLitList: scalarLit .

The scalarLit here has some conflict.

I think the main problem here is from the rule:-
scalarLitList: scalarLitList comma scalarLit

as this might cause some form of ambiguity. I would suggest the following change:
scalarLitList: scalarLit comma scalarLit
I could be wrong here though.

The other issue here seems to be related to the case a RCPAR follows.
After looking at it further, I think that the problem here is that scalarLitList is way too complex.
If we look at how the rules are:-
(check parser or: https://doc.rasdaman.org/04_ql-guide.html#appendix-a-rasql-grammar)
scalarLitList: scalarLitList COMMA scalar | scalar
scalar: complex | atomic
complex: LCPAR scalarLitList RCPAR

this can quickly get out of control.
I'm not sure if this is desired here but, I think it would be better to simplify this.
Perhaps some sort of separation between atomic and complex, would make it unambiguous.

Change History (1)

comment:1 by Bang Pham Huu, 2 years ago

Owner: set to Dimitar Misev
Status: newassigned
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