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cex: display derivations as trees

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Sometimes, understanding the derivations is difficult, because they
are serialized to fit in one line.  For instance, the example taken
from the NEWS file:

    %token ID
    %%
    s: a ID
    a: expr
    expr: expr ID ',' | "expr"

gave

    First example        expr • ID ',' ID $end
    Shift derivation     $accept → [ s → [ a → [ expr → [ expr • ID ',' ] ] ID ] $end ]
    Second example       expr • ID $end
    Reduce derivation    $accept → [ s → [ a → [ expr • ] ID ] $end ]

Printing as trees, it gives:

    First example        expr • ID ',' ID $end
    Shift derivation
      $accept
      ↳ s                      $end
        ↳ a                 ID
          ↳ expr
            ↳ expr • ID ','
    Second example       expr • ID $end
    Reduce derivation
      $accept
      ↳ s             $end
        ↳ a        ID
          ↳ expr •

* src/glyphs.h, src/glyphs.c (down_arrow, empty, derivation_separator):
New.
* src/derivation.c (derivation_print, derivation_print_impl): Rename
as...
(derivation_print_flat, derivation_print_flat_impl): These.
(fputs_if, derivation_depth, derivation_width, derivation_print_tree)
(derivation_print_tree_impl, derivation_print): New.
* src/counterexample.c (print_counterexample): Adjust.
* tests/conflicts.at, tests/counterexample.at, tests/diagnostics.at,
* tests/report.at: Adjust.
This commit is contained in:
Akim Demaille
2020-07-14 08:16:16 +02:00
parent 5544615a59
commit fff17fe8fe
9 changed files with 986 additions and 72 deletions
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119
tests/report.at
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@@ -1539,39 +1539,74 @@ AT_CHECK([LC_ALL="$locale" bison -fno-caret -o input.cc -rall -Wcex --graph=inpu
input.y: warning: 3 reduce/reduce conflicts [-Wconflicts-rr]
Shift/reduce conflict on token "⊕":
Example exp "+" exp • "⊕" exp
Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Shift derivation
exp
↳ exp "+" exp
↳ exp • "⊕" exp
Reduce derivation
exp
↳ exp "⊕" exp
↳ exp "+" exp •
Reduce/reduce conflict on tokens $end, "+", "⊕":
Example exp "+" exp •
First derivation exp → [ exp "+" exp • ]
Second derivation exp → [ exp "+" exp • ]
First derivation
exp
↳ exp "+" exp •
Second derivation
exp
↳ exp "+" exp •
Shift/reduce conflict on token "⊕":
Example exp "+" exp • "⊕" exp
Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Shift derivation
exp
↳ exp "+" exp
↳ exp • "⊕" exp
Reduce derivation
exp
↳ exp "⊕" exp
↳ exp "+" exp •
Shift/reduce conflict on token "⊕":
Example exp "⊕" exp • "⊕" exp
Shift derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ]
Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ]
Shift derivation
exp
↳ exp "⊕" exp
↳ exp • "⊕" exp
Reduce derivation
exp
↳ exp "⊕" exp
↳ exp "⊕" exp •
Shift/reduce conflict on token "+":
Example exp "⊕" exp • "+" exp
Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
Shift derivation
exp
↳ exp "⊕" exp
↳ exp • "+" exp
Reduce derivation
exp
↳ exp "+" exp
↳ exp "⊕" exp •
Shift/reduce conflict on token "+":
Example exp "⊕" exp • "+" exp
Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
Shift derivation
exp
↳ exp "⊕" exp
↳ exp • "+" exp
Reduce derivation
exp
↳ exp "+" exp
↳ exp "⊕" exp •
input.y:6.3-13: warning: rule useless in parser due to conflicts [-Wother]
]])
# Check the contents of the report.
AT_CHECK([cat input.output], [],
# FIXME: Avoid trailing white spaces.
AT_CHECK([sed -e 's/ *$//' input.output], [],
[[Rules useless in parser due to conflicts
3 exp: exp "+" exp
@@ -1714,22 +1749,38 @@ State 7
2 exp: exp "+" exp •
1 exp: exp • "⊕" exp
Example exp "+" exp • "⊕" exp
Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Shift derivation
exp
↳ exp "+" exp
↳ exp • "⊕" exp
Reduce derivation
exp
↳ exp "⊕" exp
↳ exp "+" exp •
Reduce/reduce conflict on tokens $end, "+", "⊕":
2 exp: exp "+" exp •
3 exp: exp "+" exp •
Example exp "+" exp •
First derivation exp → [ exp "+" exp • ]
Second derivation exp → [ exp "+" exp • ]
First derivation
exp
↳ exp "+" exp •
Second derivation
exp
↳ exp "+" exp •
Shift/reduce conflict on token "⊕":
3 exp: exp "+" exp •
1 exp: exp • "⊕" exp
Example exp "+" exp • "⊕" exp
Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Shift derivation
exp
↳ exp "+" exp
↳ exp • "⊕" exp
Reduce derivation
exp
↳ exp "⊕" exp
↳ exp "+" exp •
@@ -1751,22 +1802,40 @@ State 8
1 exp: exp "⊕" exp •
1 exp: exp • "⊕" exp
Example exp "⊕" exp • "⊕" exp
Shift derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ]
Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ]
Shift derivation
exp
↳ exp "⊕" exp
↳ exp • "⊕" exp
Reduce derivation
exp
↳ exp "⊕" exp
↳ exp "⊕" exp •
Shift/reduce conflict on token "+":
1 exp: exp "⊕" exp •
2 exp: exp • "+" exp
Example exp "⊕" exp • "+" exp
Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
Shift derivation
exp
↳ exp "⊕" exp
↳ exp • "+" exp
Reduce derivation
exp
↳ exp "+" exp
↳ exp "⊕" exp •
Shift/reduce conflict on token "+":
1 exp: exp "⊕" exp •
3 exp: exp • "+" exp
Example exp "⊕" exp • "+" exp
Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
Shift derivation
exp
↳ exp "⊕" exp
↳ exp • "+" exp
Reduce derivation
exp
↳ exp "+" exp
↳ exp "⊕" exp •
]])