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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
Download Patch File Download Diff File Expand all files Collapse all files

452
tests/counterexample.at
View File

@@ -17,14 +17,23 @@
AT_BANNER([[Counterexamples.]])
# AT_BISON_CHECK_CEX(EXPERR)
# --------------------------
# AT_BISON_CHECK_CEX(TREE, FLAT)
# ------------------------------
m4_define([AT_BISON_CHECK_CEX],
[AT_KEYWORDS([cex])
AT_DATA([expout], [$1])
AT_BISON_CHECK([-Wcounterexamples input.y], [0], [], [stderr])
# FIXME: Avoid trailing white spaces.
AT_CHECK([[sed -e 's/time limit exceeded: [0-9][.0-9]*/time limit exceeded: XXX/g;s/ *$//;' stderr]],
[], [$1])
m4_pushdef([AT_SET_ENV_IF],
[[YYFLAT=1; export YYFLAT;]]m4_defn([AT_SET_ENV_IF]))
AT_BISON_CHECK([-Wcounterexamples input.y], [0], [], [stderr])
AT_CHECK([[sed -e 's/time limit exceeded: [0-9][.0-9]*/time limit exceeded: XXX/g' stderr]],
[], [expout])
[], [$2])
m4_popdef([AT_SET_ENV_IF])
])
## --------------------- ##
@@ -45,6 +54,20 @@ y: A | A B;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B C
Shift derivation
s
`-> y c
`-> A . B `-> C
Reduce derivation
s
`-> a x
`-> A . `-> B C
input.y:4.4: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B C
Shift derivation s -> [ y -> [ A . B ] c -> [ C ] ]
@@ -73,6 +96,38 @@ bc: B bc C | B C;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B C
Shift derivation
s
`-> ac
`-> A ac C
`-> b
`-> . B
Reduce derivation
s
`-> a bc
`-> A . `-> B C
Shift/reduce conflict on token B:
Example A A . B B C C
Shift derivation
s
`-> ac
`-> A ac C
`-> A ac C
`-> b
`-> . b
`-> B B
Reduce derivation
s
`-> a bc
`-> A a `-> B bc C
`-> A . `-> B C
input.y:6.4: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B C
Shift derivation s -> [ ac -> [ A ac -> [ b -> [ . B ] ] C ] ]
@@ -107,6 +162,38 @@ xby: B | X xby Y;
AT_BISON_CHECK_CEX(
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B
Shift derivation
s
`-> A xby
`-> . B
Reduce derivation
s
`-> ax by
`-> A x `-> B y
`-> . `-> %empty
Shift/reduce conflict on token B:
First example A X . B Y $end
Shift derivation
$accept
`-> s $end
`-> A xby
`-> X xby Y
`-> . B
Second example A X . B y $end
Reduce derivation
$accept
`-> s $end
`-> ax by
`-> A x `-> B y
`-> X x
`-> .
input.y:5.4-9: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B
Shift derivation s -> [ A xby -> [ . B ] ]
@@ -142,6 +229,25 @@ bc: B C;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token C:
First example B . C $end
Shift derivation
$accept
`-> g $end
`-> x
`-> bc
`-> B . C
Second example B . C D $end
Reduce derivation
$accept
`-> g $end
`-> x
`-> b cd
`-> B . `-> C D
input.y:6.4: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token C:
First example B . C $end
Shift derivation $accept -> [ g -> [ x -> [ bc -> [ B . C ] ] ] $end ]
@@ -170,6 +276,25 @@ y: A A B;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token A:
First example A . A B $end
Shift derivation
$accept
`-> s $end
`-> t
`-> y
`-> A . A B
Second example A . A $end
Reduce derivation
$accept
`-> s $end
`-> s t
`-> t `-> x
`-> x `-> A
`-> A .
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token A:
First example A . A B $end
Shift derivation $accept -> [ s -> [ t -> [ y -> [ A . A B ] ] ] $end ]
@@ -202,6 +327,36 @@ y: Y;
AT_BISON_CHECK_CEX(
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token A:
Example b . A X X Y
Shift derivation
a
`-> s
`-> b . xx y
`-> A X X `-> Y
Reduce derivation
a
`-> r t
`-> b . `-> A x xy
`-> X `-> X Y
Shift/reduce conflict on token X:
First example A X . X
Shift derivation
a
`-> t
`-> A xx
`-> X . X
Second example X . X xy
Reduce derivation
a
`-> x t
`-> X . `-> X xy
input.y:4.4: warning: rule useless in parser due to conflicts [-Wother]
input.y:8.4: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token A:
Example b . A X X Y
Shift derivation a -> [ s -> [ b . xx -> [ A X X ] y -> [ Y ] ] ]
@@ -234,6 +389,19 @@ b : A | b;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr]
Reduce/reduce conflict on token $end:
Example A b .
First derivation
a
`-> A b .
Second derivation
a
`-> A b
`-> b .
input.y:4.9: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr]
Reduce/reduce conflict on token $end:
Example A b .
First derivation a -> [ A b . ]
@@ -260,6 +428,23 @@ b: D;
AT_BISON_CHECK_CEX(
[[input.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on tokens A, C:
First example D . A $end
First derivation
$accept
`-> s $end
`-> a A
`-> D .
Second example B D . A $end
Second derivation
$accept
`-> s $end
`-> B b A
`-> D .
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on tokens A, C:
First example D . A $end
First derivation $accept -> [ s -> [ a -> [ D . ] A ] $end ]
@@ -288,6 +473,24 @@ i: X | i J K;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J:
time limit exceeded: XXX
First example H i . J K $end
Shift derivation
$accept
`-> a $end
`-> H i
`-> i . J K
Second example H i . J $end
Reduce derivation
$accept
`-> s $end
`-> a J
`-> H i .
input.y:4.4-6: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J:
time limit exceeded: XXX
First example H i . J K $end
Shift derivation $accept -> [ a -> [ H i -> [ i . J K ] ] $end ]
@@ -319,6 +522,37 @@ b: A B C | A B D;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example N A . B C
Shift derivation
s
`-> n
`-> N b
`-> A . B C
Reduce derivation
s
`-> n C
`-> N a B
`-> A .
Shift/reduce conflict on token B:
Example N N A . B D C
Shift derivation
s
`-> n
`-> N n C
`-> N b
`-> A . B D
Reduce derivation
s
`-> n C
`-> N n D
`-> N a B
`-> A .
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example N A . B C
Shift derivation s -> [ n -> [ N b -> [ A . B C ] ] ]
@@ -355,6 +589,38 @@ C : A c A;
AT_BISON_CHECK_CEX(
[[input.y: warning: 4 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on tokens b, c:
Example B . b c
First derivation
S
`-> B C
`-> A b A `-> A c A
`-> B . `-> %empty `-> %empty `-> %empty
Second derivation
S
`-> B C
`-> A c A
`-> B `-> %empty
`-> A b A
`-> . `-> %empty
Reduce/reduce conflict on tokens b, c:
Example C . c b
First derivation
S
`-> C B
`-> A c A `-> A b A
`-> C . `-> %empty `-> %empty `-> %empty
Second derivation
S
`-> C B
`-> A b A
`-> C `-> %empty
`-> A c A
`-> . `-> %empty
]],
[[input.y: warning: 4 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on tokens b, c:
Example B . b c
First derivation S -> [ B -> [ A -> [ B . ] b A -> [ ] ] C -> [ A -> [ ] c A -> [ ] ] ]
@@ -387,6 +653,136 @@ d : a | c A | d;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
input.y: warning: 6 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on token A:
First example . c A A $end
First derivation
$accept
`-> a $end
`-> b d
`-> . `-> c A A
Second example . c A A $end
Second derivation
$accept
`-> a $end
`-> c d
`-> . `-> c A A
Reduce/reduce conflict on token A:
time limit exceeded: XXX
First example b . c A A $end
First derivation
$accept
`-> a $end
`-> b d
`-> a
`-> b d
`-> . `-> c A A
Second example b . A $end
Second derivation
$accept
`-> a $end
`-> b d
`-> c A
`-> .
Reduce/reduce conflict on token A:
time limit exceeded: XXX
First example c . c A A $end
First derivation
$accept
`-> a $end
`-> c d
`-> a
`-> b d
`-> . `-> c A A
Second example c . A $end
Second derivation
$accept
`-> a $end
`-> c d
`-> c A
`-> .
Shift/reduce conflict on token A:
time limit exceeded: XXX
First example b c . A
Shift derivation
a
`-> b d
`-> c . A
Second example b c . c A A $end
Reduce derivation
$accept
`-> a $end
`-> b d
`-> a
`-> c d
`-> a
`-> b d
`-> . `-> c A A
Reduce/reduce conflict on token A:
First example b c . c A A $end
First derivation
$accept
`-> a $end
`-> b d
`-> a
`-> c d
`-> a
`-> b d
`-> . `-> c A A
Second example b c . A $end
Second derivation
$accept
`-> a $end
`-> b d
`-> a
`-> c d
`-> c A
`-> .
Shift/reduce conflict on token A:
First example b c . A
Shift derivation
a
`-> b d
`-> c . A
Second example b c . A $end
Reduce derivation
$accept
`-> a $end
`-> b d
`-> a
`-> c d
`-> c A
`-> .
Reduce/reduce conflict on token $end:
Example b d .
First derivation
a
`-> b d .
Second derivation
a
`-> b d
`-> d .
Reduce/reduce conflict on token $end:
Example c d .
First derivation
a
`-> c d .
Second derivation
a
`-> c d
`-> d .
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
input.y:6.15: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
input.y: warning: 6 reduce/reduce conflicts [-Wconflicts-rr]
Reduce/reduce conflict on token A:
First example . c A A $end
First derivation $accept -> [ a -> [ b -> [ . ] d -> [ c A A ] ] $end ]
@@ -461,6 +857,21 @@ i: %empty | i J;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J:
Example H i J . J J
Shift derivation
s
`-> a J
`-> H i J . J
Reduce derivation
s
`-> a
`-> H i J J
`-> i J .
input.y:5.13-15: warning: rule useless in parser due to conflicts [-Wother]
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J:
Example H i J . J J
Shift derivation s -> [ a -> [ H i J . J ] J ]
@@ -492,6 +903,21 @@ d: D;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D:
Example A a . D
Shift derivation
s
`-> A a d
`-> . D
Reduce derivation
s
`-> A a a d
`-> b `-> D
`-> c
`-> .
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D:
Example A a . D
Shift derivation s -> [ A a d -> [ . D ] ]
@@ -521,6 +947,24 @@ d: D;
AT_BISON_CHECK_CEX(
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D:
First example A a . D $end
Shift derivation
$accept
`-> s $end
`-> A a d
`-> . D
Second example A a . D E $end
Reduce derivation
$accept
`-> s $end
`-> A a a d E
`-> b `-> D
`-> c
`-> .
]],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D:
First example A a . D $end
Shift derivation $accept -> [ s -> [ A a d -> [ . D ] ] $end ]