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cex: fix reporting of null nonterminals

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I implemented this to print A ::= [ ], but A ::= [ %empty ] might be
clearer.

* src/parse-simulation.c (nullable_closure): Don't generate null
nonterminal derivations as leaves.
* src/derivation.c (derivation_print_impl): Don't print seperator
spaces for null nonterminal.
* tests/counterexample.at: Update test results.
This commit is contained in:
Vincent Imbimbo
2020-06-21 16:20:45 -04:00
committed by Akim Demaille
parent 3dd8f2305a
commit 69e3b405d9
3 changed files with 35 additions and 21 deletions
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20
tests/counterexample.at
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@@ -107,8 +107,8 @@ xby: B | X xby Y;
AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B y
First derivation s ::=[ ax ::=[ A x ::=[ . ] ] by ::=[ B y ] ]
Example A . B
First derivation s ::=[ ax ::=[ A x ::=[ . ] ] by ::=[ B y ::=[ ] ] ]
Example A . B
Second derivation s ::=[ A xby ::=[ . B ] ]
@@ -362,16 +362,16 @@ C : A c A;
AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 4 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on tokens b, c:
Example B . b A A c A
First derivation S ::=[ B ::=[ A ::=[ B . ] b A ] C ::=[ A c A ] ]
Example B . b A c A
Second derivation S ::=[ B C ::=[ A ::=[ B ::=[ A ::=[ . ] b A ] ] c A ] ]
Example B . b c
First derivation S ::=[ B ::=[ A ::=[ B . ] b A ::=[ ] ] C ::=[ A ::=[ ] c A ::=[ ] ] ]
Example B . b c
Second derivation S ::=[ B C ::=[ A ::=[ B ::=[ A ::=[ . ] b A ::=[ ] ] ] c A ::=[ ] ] ]
Reduce/reduce conflict on tokens b, c:
Example C . c A A b A
First derivation S ::=[ C ::=[ A ::=[ C . ] c A ] B ::=[ A b A ] ]
Example C . c A b A
Second derivation S ::=[ C B ::=[ A ::=[ C ::=[ A ::=[ . ] c A ] ] b A ] ]
Example C . c b
First derivation S ::=[ C ::=[ A ::=[ C . ] c A ::=[ ] ] B ::=[ A ::=[ ] b A ::=[ ] ] ]
Example C . c b
Second derivation S ::=[ C B ::=[ A ::=[ C ::=[ A ::=[ . ] c A ::=[ ] ] ] b A ::=[ ] ] ]
]])