Future/bison
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/bison.git synced 2026-03-09 04:13:03 +00:00
Code Issues Packages Projects Releases Wiki Activity

cex: display derivations as trees

Browse Source 
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

64
tests/conflicts.at
View File

@@ -865,8 +865,14 @@ State 5
1 exp: exp OP exp .
1 exp: exp . OP exp
Example exp OP exp . OP exp
Shift derivation exp -> [ exp OP exp -> [ exp . OP exp ] ]
Reduce derivation exp -> [ exp -> [ exp OP exp . ] OP exp ]
Shift derivation
exp
`-> exp OP exp
`-> exp . OP exp
Reduce derivation
exp
`-> exp OP exp
`-> exp OP exp .
]])
@@ -1119,7 +1125,7 @@ m4_popdef([AT_TEST])
# else.
AT_SETUP([Defaulted Conflicted Reduction])
AT_KEYWORDS([report])
AT_KEYWORDS([cex report])
AT_DATA([input.y],
[[%%
@@ -1207,8 +1213,14 @@ State 1
3 num: '0' .
4 id: '0' .
Example '0' .
First derivation exp -> [ num -> [ '0' . ] ]
Second derivation exp -> [ id -> [ '0' . ] ]
First derivation
exp
`-> num
`-> '0' .
Second derivation
exp
`-> id
`-> '0' .
@@ -1579,6 +1591,8 @@ AT_CLEANUP
AT_SETUP([[Unreachable States After Conflict Resolution]])
AT_KEYWORDS([cex report])
# If conflict resolution makes states unreachable, remove those states, report
# rules that are then unused, and don't report conflicts in those states. Test
# what happens when a nonterminal becomes useless as a result of state removal
@@ -1754,17 +1768,29 @@ State 4
10 reported_conflicts: . %empty
8 reported_conflicts: . 'a'
First example resolved_conflict . 'a' 'a'
Shift derivation start -> [ resolved_conflict reported_conflicts -> [ . 'a' ] 'a' ]
Shift derivation
start
`-> resolved_conflict reported_conflicts 'a'
`-> . 'a'
Second example resolved_conflict . 'a'
Reduce derivation start -> [ resolved_conflict reported_conflicts -> [ . ] 'a' ]
Reduce derivation
start
`-> resolved_conflict reported_conflicts 'a'
`-> .
Shift/reduce conflict on token 'a':
10 reported_conflicts: . %empty
9 reported_conflicts: . 'a'
First example resolved_conflict . 'a' 'a'
Shift derivation start -> [ resolved_conflict reported_conflicts -> [ . 'a' ] 'a' ]
Shift derivation
start
`-> resolved_conflict reported_conflicts 'a'
`-> . 'a'
Second example resolved_conflict . 'a'
Reduce derivation start -> [ resolved_conflict reported_conflicts -> [ . ] 'a' ]
Reduce derivation
start
`-> resolved_conflict reported_conflicts 'a'
`-> .
@@ -1781,8 +1807,12 @@ State 5
8 reported_conflicts: 'a' .
9 reported_conflicts: 'a' .
Example 'a' .
First derivation reported_conflicts -> [ 'a' . ]
Second derivation reported_conflicts -> [ 'a' . ]
First derivation
reported_conflicts
`-> 'a' .
Second derivation
reported_conflicts
`-> 'a' .
@@ -1904,6 +1934,8 @@ AT_CLEANUP
AT_SETUP([[%nonassoc error actions for multiple reductions in a state]])
AT_KEYWORDS([cex report])
AT_DATA([[input.y]],
[[%nonassoc 'a' 'b' 'c'
%%
@@ -1965,8 +1997,14 @@ AT_CHECK([[cat input.output | sed -n '/^State 0$/,/^State 1$/p']], 0,
12 empty_c2: . %empty
13 empty_c3: . %empty
Example . 'c'
First derivation start -> [ empty_c2 -> [ . ] 'c' ]
Second derivation start -> [ empty_c3 -> [ . ] 'c' ]
First derivation
start
`-> empty_c2 'c'
`-> .
Second derivation
start
`-> empty_c3 'c'
`-> .

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 ]

100
tests/diagnostics.at
View File

@@ -28,6 +28,8 @@ m4_pushdef([AT_TEST],
AT_SETUP([$1])
AT_KEYWORDS([diagnostics])
m4_if(m4_index([$1], [Counterexample]), [-1], [], [AT_KEYWORDS([cex])])
# We need UTF-8 support for correct screen-width computation of UTF-8
# characters. Skip the test if not available.
locale=`locale -a | $EGREP '^en_US\.(UTF-8|utf8)$' | sed 1q`
@@ -535,32 +537,114 @@ exp
]],
[1],
[[input.y: <error>error:</error> shift/reduce conflicts: 4 found, 0 expected
Shift/reduce conflict on token "+":
Shift/reduce conflict on token "+":
Example <cex-0><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-leaf>exp</cex-leaf><cex-leaf> "+"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
Example <cex-0><cex-1><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-1><cex-step>exp</cex-step></cex-1><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>exp</cex-leaf><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
Shift/reduce conflict on token "else":
Shift/reduce conflict on token "else":
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "else"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1><cex-leaf> "else"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
Shift/reduce conflict on token "+":
Shift/reduce conflict on token "+":
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
Example <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-1><cex-step>exp</cex-step></cex-1><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
Shift/reduce conflict on token "+":
Shift/reduce conflict on token "+":
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "else"</cex-leaf><cex-1><cex-step> exp</cex-step></cex-1></cex-step></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>exp</cex-leaf><cex-dot> •</cex-dot><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-1>
Example <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-1><cex-step>exp</cex-step></cex-1><cex-leaf> "+"</cex-leaf><cex-leaf> exp</cex-leaf></cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-leaf>"if"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "then"</cex-leaf><cex-leaf> exp</cex-leaf><cex-leaf> "else"</cex-leaf><cex-leaf> exp</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-1>
]])
AT_TEST([[Deep Counterexamples]],
[[%expect 0
%%
exp: x1 e1 foo1 x1 | y1 e2 bar1 y1
foo1: foo2
foo2: foo3
foo3: x1 foo4
foo4: "quuux"
bar1: bar2
bar2: bar3
bar3: y1 bar4
bar4: "quuux"
x1: x2
x2: x3
x3: "X"
y1: y2
y2: y3
y3: "X"
e1:
e2:
]],
[1],
[[input.y:30.4: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
30 | e1:
| <warning>^</warning>
| <fixit-insert>%empty</fixit-insert>
input.y:31.4: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
31 | e2:
| <warning>^</warning>
| <fixit-insert>%empty</fixit-insert>
input.y: <error>error:</error> reduce/reduce conflicts: 1 found, 0 expected
Reduce/reduce conflict on token "X":
Example <cex-0><cex-1><cex-2><cex-3><cex-leaf>"X"</cex-leaf> <cex-dot>•</cex-dot></cex-3></cex-2></cex-1><cex-4></cex-4><cex-5><cex-6><cex-7><cex-8><cex-9><cex-10> <cex-leaf>"X"</cex-leaf></cex-10></cex-9></cex-8><cex-11> <cex-leaf>"quuux"</cex-leaf></cex-11></cex-7></cex-6></cex-5><cex-12><cex-13><cex-14> <cex-leaf>"X"</cex-leaf></cex-14></cex-13></cex-12></cex-0>
First derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-1><cex-step>x1</cex-step></cex-1><cex-4><cex-step> e1</cex-step></cex-4><cex-5><cex-step> foo1</cex-step></cex-5><cex-12><cex-step> x1</cex-step></cex-12></cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-2><cex-step>x2</cex-step></cex-2></cex-step></cex-1><cex-4><cex-step> ↳ ε</cex-step></cex-4><cex-5><cex-step> ↳ <cex-6><cex-step>foo2</cex-step></cex-6></cex-step></cex-5><cex-12><cex-step> ↳ <cex-13><cex-step>x2</cex-step></cex-13></cex-step></cex-12>
<cex-2><cex-step> ↳ <cex-3><cex-step>x3</cex-step></cex-3></cex-step></cex-2><cex-6><cex-step> ↳ <cex-7><cex-step>foo3</cex-step></cex-7></cex-step></cex-6><cex-13><cex-step> ↳ <cex-14><cex-step>x3</cex-step></cex-14></cex-step></cex-13>
<cex-3><cex-step> ↳ <cex-leaf>"X"</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-3><cex-7><cex-step> ↳ <cex-8><cex-step>x1</cex-step></cex-8><cex-11><cex-step> foo4</cex-step></cex-11></cex-step></cex-7><cex-14><cex-step> ↳ <cex-leaf>"X"</cex-leaf></cex-step></cex-14>
<cex-8><cex-step> ↳ <cex-9><cex-step>x2</cex-step></cex-9></cex-step></cex-8><cex-11><cex-step> ↳ <cex-leaf>"quuux"</cex-leaf></cex-step></cex-11>
<cex-9><cex-step> ↳ <cex-10><cex-step>x3</cex-step></cex-10></cex-step></cex-9>
<cex-10><cex-step> ↳ <cex-leaf>"X"</cex-leaf></cex-step></cex-10>
Example <cex-0><cex-1><cex-2><cex-3><cex-leaf>"X"</cex-leaf> <cex-dot>•</cex-dot></cex-3></cex-2></cex-1><cex-4></cex-4><cex-5><cex-6><cex-7><cex-8><cex-9><cex-10> <cex-leaf>"X"</cex-leaf></cex-10></cex-9></cex-8><cex-11> <cex-leaf>"quuux"</cex-leaf></cex-11></cex-7></cex-6></cex-5><cex-12><cex-13><cex-14> <cex-leaf>"X"</cex-leaf></cex-14></cex-13></cex-12></cex-0>
Second derivation
<cex-0><cex-step>exp</cex-step></cex-0>
<cex-0><cex-step>↳ <cex-1><cex-step>y1</cex-step></cex-1><cex-4><cex-step> e2</cex-step></cex-4><cex-5><cex-step> bar1</cex-step></cex-5><cex-12><cex-step> y1</cex-step></cex-12></cex-step></cex-0>
<cex-1><cex-step> ↳ <cex-2><cex-step>y2</cex-step></cex-2></cex-step></cex-1><cex-4><cex-step> ↳ ε</cex-step></cex-4><cex-5><cex-step> ↳ <cex-6><cex-step>bar2</cex-step></cex-6></cex-step></cex-5><cex-12><cex-step> ↳ <cex-13><cex-step>y2</cex-step></cex-13></cex-step></cex-12>
<cex-2><cex-step> ↳ <cex-3><cex-step>y3</cex-step></cex-3></cex-step></cex-2><cex-6><cex-step> ↳ <cex-7><cex-step>bar3</cex-step></cex-7></cex-step></cex-6><cex-13><cex-step> ↳ <cex-14><cex-step>y3</cex-step></cex-14></cex-step></cex-13>
<cex-3><cex-step> ↳ <cex-leaf>"X"</cex-leaf><cex-dot> •</cex-dot></cex-step></cex-3><cex-7><cex-step> ↳ <cex-8><cex-step>y1</cex-step></cex-8><cex-11><cex-step> bar4</cex-step></cex-11></cex-step></cex-7><cex-14><cex-step> ↳ <cex-leaf>"X"</cex-leaf></cex-step></cex-14>
<cex-8><cex-step> ↳ <cex-9><cex-step>y2</cex-step></cex-9></cex-step></cex-8><cex-11><cex-step> ↳ <cex-leaf>"quuux"</cex-leaf></cex-step></cex-11>
<cex-9><cex-step> ↳ <cex-10><cex-step>y3</cex-step></cex-10></cex-step></cex-9>
<cex-10><cex-step> ↳ <cex-leaf>"X"</cex-leaf></cex-step></cex-10>
input.y: <warning>warning:</warning> fix-its can be applied. Rerun with option '--update'. [<warning>-Wother</warning>]
]])

119
tests/report.at
View File

@@ -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 •
]])