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[PATCH 3/3] cex: prefer → to ::=
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From: |
Akim Demaille |
|
Subject: |
[PATCH 3/3] cex: prefer → to ::= |
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Date: |
Sat, 11 Jul 2020 18:53:55 +0200 |
It does not make a lot of sense to use ::= in our counterexamples,
that's not something that belongs to the Bison "vocabulary". Using
the colon makes sense, but it's too discreet. Let's use the arrow,
which we already use in some reports (HTML and Dot).
* src/gram.h (print_dot_fallback): Generalize into...
(print_fallback): this.
(print_arrow): New.
* src/derivation.c: Use it.
* NEWS, tests/conflicts.at, tests/counterexample.at,
* tests/diagnostics.at, tests/report.at: Adjust.
* doc/bison.texi: Ditto.
Unfortunately the literal `→` is output as `↦`. So we need to use
@arrow.
---
NEWS | 8 +--
doc/bison.texi | 28 +++++------
src/derivation.c | 4 +-
src/gram.h | 30 ++++++++---
tests/conflicts.at | 24 ++++-----
tests/counterexample.at | 108 ++++++++++++++++++++--------------------
tests/diagnostics.at | 22 ++++----
tests/report.at | 48 +++++++++---------
8 files changed, 147 insertions(+), 125 deletions(-)
diff --git a/NEWS b/NEWS
index 38cf60c8..b4b61f40 100644
--- a/NEWS
+++ b/NEWS
@@ -45,8 +45,8 @@ GNU Bison NEWS
conflict. For example:
Example exp '+' exp • '/' exp
- First derivation exp ::=[ exp ::=[ exp '+' exp • ] '/' exp ]
- Second derivation exp ::=[ exp '+' exp ::=[ exp • '/' exp ] ]
+ First derivation exp → [ exp → [ exp '+' exp • ] '/' exp ]
+ Second derivation exp → [ exp '+' exp → [ exp • '/' exp ] ]
When Bison is installed with text styling enabled, the example is actually
shown twice, with colors highlighting the ambiguity.
@@ -57,9 +57,9 @@ GNU Bison NEWS
generates two examples that are the same up until the dot:
First example expr • ID $end
- First derivation $accept ::=[ s ::=[ a ::=[ expr • ] ID ] $end ]
+ First derivation $accept → [ s → [ a → [ expr • ] ID ] $end ]
Second example expr • ID ',' ID $end
- Second derivation $accept ::=[ s ::=[ a ::=[ expr ::=[ expr • ID ',' ]
] ID ] $end ]
+ Second derivation $accept → [ s → [ a → [ expr → [ expr • ID ',' ] ] ID
] $end ]
In these cases, the parser usually doesn't have enough lookahead to
differentiate the two given examples.
diff --git a/doc/bison.texi b/doc/bison.texi
index 56367a3d..59b71a7c 100644
--- a/doc/bison.texi
+++ b/doc/bison.texi
@@ -9937,9 +9937,9 @@ output is actually in color)}:
Shift/reduce conflict on token "else":
@group
Example @yellow{"if" expr "then"} @blue{"if" expr "then" stmt}
@red{•} @yellow{"else" stmt}
- First derivation @yellow{if_stmt ::=[ "if" expr "then"} @green{stmt ::=[}
@blue{if_stmt ::=[ "if" expr "then" stmt} @red{•} @blue{]} @green{]}
@yellow{"else" stmt ]}
+ First derivation @yellow{if_stmt @arrow [ "if" expr "then"} @green{stmt
@arrow [} @blue{if_stmt @arrow [ "if" expr "then" stmt} @red{•} @blue{]}
@green{]} @yellow{"else" stmt ]}
Example @yellow{"if" expr "then"} @blue{"if" expr "then" stmt}
@red{•} @blue{"else" stmt}
- Second derivation @yellow{if_stmt ::=[ "if" expr "then"} @green{stmt ::=[}
@blue{if_stmt ::=[ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]}
@green{]} @yellow{]}
+ Second derivation @yellow{if_stmt @arrow [ "if" expr "then"} @green{stmt
@arrow [} @blue{if_stmt @arrow [ "if" expr "then" stmt} @red{•} @blue{"else"
stmt ]} @green{]} @yellow{]}
@end group
@end example
@end ifhtml
@@ -9950,11 +9950,11 @@ Shift/reduce conflict on token "else":
Example
@yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•}
@yellow{"else" stmt}
First derivation
- @yellow{if_stmt ::=[ "if" expr "then"} @green{stmt ::=[} @blue{if_stmt
::=[ "if" expr "then" stmt} @red{•} @blue{]} @green{]} @yellow{"else" stmt ]}
+ @yellow{if_stmt @arrow [ "if" expr "then"} @green{stmt @arrow [}
@blue{if_stmt @arrow [ "if" expr "then" stmt} @red{•} @blue{]} @green{]}
@yellow{"else" stmt ]}
Example
@yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•}
@blue{"else" stmt}
Second derivation
- @yellow{if_stmt ::=[ "if" expr "then"} @green{stmt ::=[} @blue{if_stmt
::=[ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]} @green{]} @yellow{]}
+ @yellow{if_stmt @arrow [ "if" expr "then"} @green{stmt @arrow [}
@blue{if_stmt @arrow [ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]}
@green{]} @yellow{]}
@end group
@end smallexample
@end ifnothtml
@@ -9988,21 +9988,21 @@ sequence.y: @dwarning{warning}: 1 shift/reduce conflict
[@dwarning{-Wconflicts-s
sequence.y: @dwarning{warning}: 2 reduce/reduce conflicts
[@dwarning{-Wconflicts-rr}]
Shift/reduce conflict on token "word":
Example @red{•} @yellow{"word"}
- First derivation @yellow{sequence ::=[} @green{sequence ::=[} @red{•}
@green{]} @yellow{"word" ]}
+ First derivation @yellow{sequence @arrow [} @green{sequence @arrow [}
@red{•} @green{]} @yellow{"word" ]}
Example @red{•} @green{"word"}
- Second derivation @yellow{sequence ::=[} @green{maybeword ::=[} @red{•}
@green{"word" ]} @yellow{]}
+ Second derivation @yellow{sequence @arrow [} @green{maybeword @arrow [}
@red{•} @green{"word" ]} @yellow{]}
Reduce/reduce conflict on tokens $end, "word":
Example @red{•}
- First derivation @yellow{sequence ::=[} @red{•} @yellow{]}
+ First derivation @yellow{sequence @arrow [} @red{•} @yellow{]}
Example @red{•}
- Second derivation @yellow{sequence ::=[} @green{maybeword ::=[} @red{•}
@green{]} @yellow{]}
+ Second derivation @yellow{sequence @arrow [} @green{maybeword @arrow [}
@red{•} @green{]} @yellow{]}
Shift/reduce conflict on token "word":
Example @red{•} @yellow{"word"}
- First derivation @yellow{sequence ::=[} @green{sequence ::=[}
@blue{maybeword ::=[} @red{•} @blue{]} @green{]} @yellow{"word" ]}
+ First derivation @yellow{sequence @arrow [} @green{sequence @arrow [}
@blue{maybeword @arrow [} @red{•} @blue{]} @green{]} @yellow{"word" ]}
Example @red{•} @green{"word"}
- Second derivation @yellow{sequence ::=[} @green{maybeword ::=[} @red{•}
@green{"word" ]} @yellow{]}
+ Second derivation @yellow{sequence @arrow [} @green{maybeword @arrow [}
@red{•} @green{"word" ]} @yellow{]}
sequence.y:8.3-45: @dwarning{warning}: rule useless in parser due to conflicts
[@dwarning{-Wother}]
8 | @dwarning{%empty @{ printf ("empty maybeword\n"); @}}
@@ -10034,9 +10034,9 @@ expr: %empty | expr ID ','
@smallexample
Shift/reduce conflict on token ID:
First example @blue{expr} @red{•} @green{ID} @yellow{$end}
- First derivation @yellow{$accept ::=[} @green{s ::=[} @blue{a ::=[ expr}
@red{•} @blue{]} @green{ID ]} @yellow{$end ]}
+ First derivation @yellow{$accept @arrow [} @green{s @arrow [} @blue{a
@arrow [ expr} @red{•} @blue{]} @green{ID ]} @yellow{$end ]}
Second example @purple{expr} @red{•} @purple{ID ','} @green{ID}
@yellow{$end}
- Second derivation @yellow{$accept ::=[} @green{s ::=[} @blue{a ::=[}
@purple{expr ::=[ expr} @red{•} @purple{ID ',' ]} @blue{]} @green{ID ]}
@yellow{$end ]}
+ Second derivation @yellow{$accept @arrow [} @green{s @arrow [} @blue{a
@arrow [} @purple{expr @arrow [ expr} @red{•} @purple{ID ',' ]} @blue{]}
@green{ID ]} @yellow{$end ]}
@end smallexample
This conflict is caused by the parser not having enough information to know
@@ -10433,9 +10433,9 @@ Shift/reduce conflict on token '/':
1 exp: exp '+' exp •
4 exp: exp • '/' exp
Example @green{exp '+' exp} @red{•} @yellow{'/' exp}
- First derivation @yellow{exp ::=[} @green{exp ::=[ exp '+' exp} @red{•}
@green{]} @yellow{'/' exp ]}
+ First derivation @yellow{exp @arrow [} @green{exp @arrow [ exp '+' exp}
@red{•} @green{]} @yellow{'/' exp ]}
Example @yellow{exp '+'} @green{exp} @red{•} @green{'/' exp}
- Second derivation @yellow{exp ::=[ exp '+'} @green{exp ::=[ exp} @red{•}
@green{'/' exp ]} @yellow{]}
+ Second derivation @yellow{exp @arrow [ exp '+'} @green{exp @arrow [ exp}
@red{•} @green{'/' exp ]} @yellow{]}
@end example
This shows two separate derivations in the grammar for the same @code{exp}:
diff --git a/src/derivation.c b/src/derivation.c
index 451fabdd..da5649fc 100644
--- a/src/derivation.c
+++ b/src/derivation.c
@@ -145,7 +145,9 @@ derivation_print_impl (const derivation *deriv, FILE *f,
{
fputs (prefix, f);
begin_use_class ("cex-step", f);
- fprintf (f, "%s ::=[ ", sym->tag);
+ fprintf (f, "%s ", sym->tag);
+ print_arrow (f);
+ fprintf (f, " [ ");
end_use_class ("cex-step", f);
prefix = "";
}
diff --git a/src/gram.h b/src/gram.h
index f4f5e55b..6e1da4e8 100644
--- a/src/gram.h
+++ b/src/gram.h
@@ -217,23 +217,41 @@ typedef struct
extern rule *rules;
extern rule_number nrules;
-/* Fallback in case we can't print "•". */
+/* Fallback in case we can't print "•" or "→". */
static inline long
-print_dot_fallback (unsigned int code _GL_UNUSED,
- const char *msg _GL_UNUSED,
- void *callback_arg)
+print_fallback (unsigned int code _GL_UNUSED,
+ const char *msg _GL_UNUSED,
+ void *callback_arg)
{
FILE *out = (FILE *) callback_arg;
- putc ('.', out);
+ switch (code)
+ {
+ case 0x2022:
+ putc ('.', out);
+ break;
+ case 0x2192:
+ fputs ("->", out);
+ break;
+ default:
+ abort ();
+ }
return -1;
}
+/* Print "→", the symbol used to separate the lhs of a rule from its
+ rhs. */
+static inline void
+print_arrow (FILE *out)
+{
+ unicode_to_mb (0x2192, fwrite_success_callback, print_fallback, out);
+}
+
/* Print "•", the symbol used to represent a point in an item (aka, a
dotted rule). */
static inline void
print_dot (FILE *out)
{
- unicode_to_mb (0x2022, fwrite_success_callback, print_dot_fallback, out);
+ unicode_to_mb (0x2022, fwrite_success_callback, print_fallback, out);
}
/* Get the rule associated to this item. ITEM points inside RITEM. */
diff --git a/tests/conflicts.at b/tests/conflicts.at
index 7a1cafee..22456f30 100644
--- a/tests/conflicts.at
+++ b/tests/conflicts.at
@@ -865,8 +865,8 @@ State 5
1 exp: exp OP exp .
1 exp: exp . OP exp
Example exp OP exp . OP exp
- First derivation exp ::=[ exp ::=[ exp OP exp . ] OP exp ]
- Second derivation exp ::=[ exp OP exp ::=[ exp . OP exp ] ]
+ First derivation exp -> [ exp -> [ exp OP exp . ] OP exp ]
+ Second derivation exp -> [ exp OP exp -> [ exp . OP exp ] ]
]])
@@ -1207,8 +1207,8 @@ 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' . ] ]
@@ -1754,17 +1754,17 @@ State 4
10 reported_conflicts: . %empty
8 reported_conflicts: . 'a'
First example resolved_conflict . 'a'
- First derivation start ::=[ resolved_conflict reported_conflicts
::=[ . ] 'a' ]
+ First derivation start -> [ resolved_conflict reported_conflicts
-> [ . ] 'a' ]
Second example resolved_conflict . 'a' 'a'
- Second derivation start ::=[ resolved_conflict reported_conflicts
::=[ . 'a' ] 'a' ]
+ Second derivation start -> [ resolved_conflict reported_conflicts
-> [ . 'a' ] 'a' ]
Shift/reduce conflict on token 'a':
10 reported_conflicts: . %empty
9 reported_conflicts: . 'a'
First example resolved_conflict . 'a'
- First derivation start ::=[ resolved_conflict reported_conflicts
::=[ . ] 'a' ]
+ First derivation start -> [ resolved_conflict reported_conflicts
-> [ . ] 'a' ]
Second example resolved_conflict . 'a' 'a'
- Second derivation start ::=[ resolved_conflict reported_conflicts
::=[ . 'a' ] 'a' ]
+ Second derivation start -> [ resolved_conflict reported_conflicts
-> [ . 'a' ] 'a' ]
@@ -1781,8 +1781,8 @@ 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' . ]
@@ -1965,8 +1965,8 @@ 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' ]
diff --git a/tests/counterexample.at b/tests/counterexample.at
index 92ce5109..17123106 100644
--- a/tests/counterexample.at
+++ b/tests/counterexample.at
@@ -47,8 +47,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B C
- First derivation s ::=[ a ::=[ A . ] x ::=[ B C ] ]
- Second derivation s ::=[ y ::=[ A . B ] c ::=[ C ] ]
+ First derivation s -> [ a -> [ A . ] x -> [ B C ] ]
+ Second derivation s -> [ y -> [ A . B ] c -> [ C ] ]
input.y:4.4: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -76,13 +76,13 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B C
- First derivation s ::=[ a ::=[ A . ] bc ::=[ B C ] ]
- Second derivation s ::=[ ac ::=[ A ac ::=[ b ::=[ . B ] ] C ] ]
+ First derivation s -> [ a -> [ A . ] bc -> [ B C ] ]
+ Second derivation s -> [ ac -> [ A ac -> [ b -> [ . B ] ] C ] ]
Shift/reduce conflict on token B:
Example A A . B B C C
- First derivation s ::=[ a ::=[ A a ::=[ A . ] ] bc ::=[ B bc ::=[ B C ]
C ] ]
- Second derivation s ::=[ ac ::=[ A ac ::=[ A ac ::=[ b ::=[ . b ::=[ B B
] ] ] C ] C ] ]
+ First derivation s -> [ a -> [ A a -> [ A . ] ] bc -> [ B bc -> [ B C ]
C ] ]
+ Second derivation s -> [ ac -> [ A ac -> [ A ac -> [ b -> [ . b -> [ B B
] ] ] C ] C ] ]
input.y:6.4: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -111,14 +111,14 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example A . B
- First derivation s ::=[ ax ::=[ A x ::=[ . ] ] by ::=[ B y ::=[ ] ] ]
- Second derivation s ::=[ A xby ::=[ . B ] ]
+ First derivation s -> [ ax -> [ A x -> [ . ] ] by -> [ B y -> [ ] ] ]
+ Second derivation s -> [ A xby -> [ . B ] ]
Shift/reduce conflict on token B:
First example A X . B y $end
- First derivation $accept ::=[ s ::=[ ax ::=[ A x ::=[ X x ::=[ . ] ] ]
by ::=[ B y ] ] $end ]
+ First derivation $accept -> [ s -> [ ax -> [ A x -> [ X x -> [ . ] ] ]
by -> [ B y ] ] $end ]
Second example A X . B Y $end
- Second derivation $accept ::=[ s ::=[ A xby ::=[ X xby ::=[ . B ] Y ] ]
$end ]
+ Second derivation $accept -> [ s -> [ A xby -> [ X xby -> [ . B ] Y ] ]
$end ]
input.y:5.4-9: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -147,9 +147,9 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token C:
First example B . C D $end
- First derivation $accept ::=[ g ::=[ x ::=[ b ::=[ B . ] cd ::=[ C D ] ]
] $end ]
+ First derivation $accept -> [ g -> [ x -> [ b -> [ B . ] cd -> [ C D ] ]
] $end ]
Second example B . C $end
- Second derivation $accept ::=[ g ::=[ x ::=[ bc ::=[ B . C ] ] ] $end ]
+ Second derivation $accept -> [ g -> [ x -> [ bc -> [ B . C ] ] ] $end ]
input.y:6.4: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -176,9 +176,9 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token A:
First example A . A $end
- First derivation $accept ::=[ s ::=[ s ::=[ t ::=[ x ::=[ A . ] ] ] t
::=[ x ::=[ A ] ] ] $end ]
+ First derivation $accept -> [ s -> [ s -> [ t -> [ x -> [ A . ] ] ] t ->
[ x -> [ A ] ] ] $end ]
Second example A . A B $end
- Second derivation $accept ::=[ s ::=[ t ::=[ y ::=[ A . A B ] ] ] $end ]
+ Second derivation $accept -> [ s -> [ t -> [ y -> [ A . A B ] ] ] $end ]
]])
@@ -209,14 +209,14 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token A:
Example b . A X X Y
- First derivation a ::=[ r ::=[ b . ] t ::=[ A x ::=[ X ] xy ::=[ X Y ] ]
]
- Second derivation a ::=[ s ::=[ b . xx ::=[ A X X ] y ::=[ Y ] ] ]
+ First derivation a -> [ r -> [ b . ] t -> [ A x -> [ X ] xy -> [ X Y ] ]
]
+ Second derivation a -> [ s -> [ b . xx -> [ A X X ] y -> [ Y ] ] ]
Shift/reduce conflict on token X:
First example X . X xy
- First derivation a ::=[ x ::=[ X . ] t ::=[ X xy ] ]
+ First derivation a -> [ x -> [ X . ] t -> [ X xy ] ]
Second example A X . X
- Second derivation a ::=[ t ::=[ A xx ::=[ X . X ] ] ]
+ Second derivation a -> [ t -> [ A xx -> [ X . X ] ] ]
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]
@@ -242,8 +242,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[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 . ] ]
+ First derivation a -> [ A b . ]
+ Second derivation a -> [ A b -> [ b . ] ]
input.y:4.9: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -269,9 +269,9 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[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 ]
+ First derivation $accept -> [ s -> [ a -> [ D . ] A ] $end ]
Second example B D . A $end
- Second derivation $accept ::=[ s ::=[ B b ::=[ D . ] A ] $end ]
+ Second derivation $accept -> [ s -> [ B b -> [ D . ] A ] $end ]
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -298,9 +298,9 @@ AT_BISON_CHECK_CEX([input.y], [], [],
Shift/reduce conflict on token J:
time limit exceeded: XXX
First example H i . J $end
- First derivation $accept ::=[ s ::=[ a ::=[ H i . ] J ] $end ]
+ First derivation $accept -> [ s -> [ a -> [ H i . ] J ] $end ]
Second example H i . J K $end
- Second derivation $accept ::=[ a ::=[ H i ::=[ i . J K ] ] $end ]
+ Second derivation $accept -> [ a -> [ H i -> [ i . J K ] ] $end ]
input.y:4.4-6: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -330,13 +330,13 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B:
Example N A . B C
- First derivation s ::=[ n ::=[ N a ::=[ A . ] B ] C ]
- Second derivation s ::=[ n ::=[ N b ::=[ A . B C ] ] ]
+ First derivation s -> [ n -> [ N a -> [ A . ] B ] C ]
+ Second derivation s -> [ n -> [ N b -> [ A . B C ] ] ]
Shift/reduce conflict on token B:
Example N N A . B D C
- First derivation s ::=[ n ::=[ N n ::=[ N a ::=[ A . ] B ] D ] C ]
- Second derivation s ::=[ n ::=[ N n ::=[ N b ::=[ A . B D ] ] C ] ]
+ First derivation s -> [ n -> [ N n -> [ N a -> [ A . ] B ] D ] C ]
+ Second derivation s -> [ n -> [ N n -> [ N b -> [ A . B D ] ] C ] ]
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -367,13 +367,13 @@ 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 c
- First derivation S ::=[ B ::=[ A ::=[ B . ] b A ::=[ ] ] C ::=[ A ::=[ ]
c A ::=[ ] ] ]
- Second derivation S ::=[ B C ::=[ A ::=[ B ::=[ A ::=[ . ] b A ::=[ ] ] ]
c A ::=[ ] ] ]
+ First derivation S -> [ B -> [ A -> [ B . ] b A -> [ ] ] C -> [ A -> [ ]
c A -> [ ] ] ]
+ Second derivation S -> [ B C -> [ A -> [ B -> [ A -> [ . ] b A -> [ ] ] ]
c A -> [ ] ] ]
Reduce/reduce conflict on tokens b, c:
Example C . c b
- First derivation S ::=[ C ::=[ A ::=[ C . ] c A ::=[ ] ] B ::=[ A ::=[ ]
b A ::=[ ] ] ]
- Second derivation S ::=[ C B ::=[ A ::=[ C ::=[ A ::=[ . ] c A ::=[ ] ] ]
b A ::=[ ] ] ]
+ First derivation S -> [ C -> [ A -> [ C . ] c A -> [ ] ] B -> [ A -> [ ]
b A -> [ ] ] ]
+ Second derivation S -> [ C B -> [ A -> [ C -> [ A -> [ . ] c A -> [ ] ] ]
b A -> [ ] ] ]
]])
@@ -400,52 +400,52 @@ AT_BISON_CHECK_CEX([input.y], [], [],
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 ]
+ First derivation $accept -> [ a -> [ b -> [ . ] d -> [ c A A ] ] $end ]
Second example . c A A $end
- Second derivation $accept ::=[ a ::=[ c ::=[ . ] d ::=[ c A A ] ] $end ]
+ Second derivation $accept -> [ a -> [ c -> [ . ] d -> [ c A A ] ] $end ]
Reduce/reduce conflict on token A:
time limit exceeded: XXX
First example b . c A A $end
- First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ b ::=[ . ] d ::=[ c
A A ] ] ] ] $end ]
+ First derivation $accept -> [ a -> [ b d -> [ a -> [ b -> [ . ] d -> [ c
A A ] ] ] ] $end ]
Second example b . A $end
- Second derivation $accept ::=[ a ::=[ b d ::=[ c ::=[ . ] A ] ] $end ]
+ Second derivation $accept -> [ a -> [ b d -> [ c -> [ . ] A ] ] $end ]
Reduce/reduce conflict on token A:
time limit exceeded: XXX
First example c . c A A $end
- First derivation $accept ::=[ a ::=[ c d ::=[ a ::=[ b ::=[ . ] d ::=[ c
A A ] ] ] ] $end ]
+ First derivation $accept -> [ a -> [ c d -> [ a -> [ b -> [ . ] d -> [ c
A A ] ] ] ] $end ]
Second example c . A $end
- Second derivation $accept ::=[ a ::=[ c d ::=[ c ::=[ . ] A ] ] $end ]
+ Second derivation $accept -> [ a -> [ c d -> [ c -> [ . ] A ] ] $end ]
Shift/reduce conflict on token A:
time limit exceeded: XXX
First example b c . c A A $end
- First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ a ::=[ b
::=[ . ] d ::=[ c A A ] ] ] ] ] ] $end ]
+ First derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ a -> [ b
-> [ . ] d -> [ c A A ] ] ] ] ] ] $end ]
Second example b c . A
- Second derivation a ::=[ b d ::=[ c . A ] ]
+ Second derivation a -> [ b d -> [ c . A ] ]
Reduce/reduce conflict on token A:
First example b c . c A A $end
- First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ a ::=[ b
::=[ . ] d ::=[ c A A ] ] ] ] ] ] $end ]
+ First derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ a -> [ b
-> [ . ] d -> [ c A A ] ] ] ] ] ] $end ]
Second example b c . A $end
- Second derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ c ::=[ . ]
A ] ] ] ] $end ]
+ Second derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ c -> [ . ]
A ] ] ] ] $end ]
Shift/reduce conflict on token A:
First example b c . A $end
- First derivation $accept ::=[ a ::=[ b d ::=[ a ::=[ c d ::=[ c ::=[ . ]
A ] ] ] ] $end ]
+ First derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ c -> [ . ]
A ] ] ] ] $end ]
Second example b c . A
- Second derivation a ::=[ b d ::=[ c . A ] ]
+ Second derivation a -> [ b d -> [ c . A ] ]
Reduce/reduce conflict on token $end:
Example b d .
- First derivation a ::=[ b d . ]
- Second derivation a ::=[ b d ::=[ 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 . ] ]
+ 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]
@@ -475,8 +475,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J:
Example H i J . J J
- First derivation s ::=[ a ::=[ H i ::=[ i J . ] J J ] ]
- Second derivation s ::=[ a ::=[ H i J . J ] J ]
+ First derivation s -> [ a -> [ H i -> [ i J . ] J J ] ]
+ Second derivation s -> [ a -> [ H i J . J ] J ]
input.y:5.13-15: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -507,8 +507,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D:
Example A a . D
- First derivation s ::=[ A a a ::=[ b ::=[ c ::=[ . ] ] ] d ::=[ D ] ]
- Second derivation s ::=[ A a d ::=[ . D ] ]
+ First derivation s -> [ A a a -> [ b -> [ c -> [ . ] ] ] d -> [ D ] ]
+ Second derivation s -> [ A a d -> [ . D ] ]
]])
@@ -537,9 +537,9 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D:
First example A a . D E $end
- First derivation $accept ::=[ s ::=[ A a a ::=[ b ::=[ c ::=[ . ] ] ] d
::=[ D ] E ] $end ]
+ First derivation $accept -> [ s -> [ A a a -> [ b -> [ c -> [ . ] ] ] d
-> [ D ] E ] $end ]
Second example A a . D $end
- Second derivation $accept ::=[ s ::=[ A a d ::=[ . D ] ] $end ]
+ Second derivation $accept -> [ s -> [ A a d -> [ . D ] ] $end ]
]])
diff --git a/tests/diagnostics.at b/tests/diagnostics.at
index 17a2ebc5..40480a59 100644
--- a/tests/diagnostics.at
+++ b/tests/diagnostics.at
@@ -376,10 +376,12 @@ exp:^M
]],
[0],
[[input.y:11.9-11: <warning>warning:</warning> symbol FOO redeclared
[<warning>-Wother</warning>]
- 11 | %token
<warning>FOO</warning>
+ 11 | %token
+ <warning>FOO</warning>
| <warning>^~~</warning>
input.y:10.9-11: <note>note:</note> previous declaration
- 10 | %token
<note>FOO</note>
+ 10 | %token
+ <note>FOO</note>
| <note>^~~</note>
input.y:13.5: <warning>warning:</warning> empty rule without %empty
[<warning>-Wempty-rule</warning>]
13 | exp:
@@ -535,27 +537,27 @@ exp
[[input.y: <error>error:</error> shift/reduce conflicts: 4 found, 0 expected
Shift/reduce conflict on token "+":
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>
- First derivation <cex-0><cex-step>exp ::=[
</cex-step><cex-1><cex-step>exp ::=[ </cex-step><cex-leaf>exp</cex-leaf>
<cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf>
<cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
+ First derivation <cex-0><cex-step>exp → [
</cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf>
<cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf>
<cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
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>
- Second 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>
+ Second 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>
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-1>
<cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
- First 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-step> ]</cex-step></cex-1> <cex-leaf>"else"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
+ First 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-step> ]</cex-step></cex-1> <cex-leaf>"else"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
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>
- Second 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>
+ Second 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>
Shift/reduce conflict on token "+":
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>
- First derivation <cex-0><cex-step>exp ::=[
</cex-step><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-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
+ First derivation <cex-0><cex-step>exp → [
</cex-step><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-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
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>
- Second 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>
+ Second 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>
Shift/reduce conflict on token "+":
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>
- First derivation <cex-0><cex-step>exp ::=[
</cex-step><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-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf>
<cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
+ First derivation <cex-0><cex-step>exp → [
</cex-step><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-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf>
<cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf>
<cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
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>
- Second 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>
+ Second 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>
]])
diff --git a/tests/report.at b/tests/report.at
index 678227c0..e6a30dd7 100644
--- a/tests/report.at
+++ b/tests/report.at
@@ -1539,33 +1539,33 @@ 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
- First derivation exp ::=[ exp ::=[ exp "+" exp • ] "⊕" exp ]
- Second derivation exp ::=[ exp "+" exp ::=[ exp • "⊕" exp ] ]
+ First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
+ Second 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
- First derivation exp ::=[ exp ::=[ exp "+" exp • ] "⊕" exp ]
- Second derivation exp ::=[ exp "+" exp ::=[ exp • "⊕" exp ] ]
+ First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
+ Second derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Shift/reduce conflict on token "⊕":
Example exp "⊕" exp • "⊕" exp
- First derivation exp ::=[ exp ::=[ exp "⊕" exp • ] "⊕" exp ]
- Second derivation exp ::=[ exp "⊕" exp ::=[ exp • "⊕" exp ] ]
+ First derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ]
+ Second derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ]
Shift/reduce conflict on token "+":
Example exp "⊕" exp • "+" exp
- First derivation exp ::=[ exp ::=[ exp "⊕" exp • ] "+" exp ]
- Second derivation exp ::=[ exp "⊕" exp ::=[ exp • "+" exp ] ]
+ First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
+ Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Shift/reduce conflict on token "+":
Example exp "⊕" exp • "+" exp
- First derivation exp ::=[ exp ::=[ exp "⊕" exp • ] "+" exp ]
- Second derivation exp ::=[ exp "⊕" exp ::=[ exp • "+" exp ] ]
+ First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
+ Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
input.y:6.3-13: warning: rule useless in parser due to conflicts [-Wother]
]])
@@ -1714,22 +1714,22 @@ State 7
2 exp: exp "+" exp •
1 exp: exp • "⊕" exp
Example exp "+" exp • "⊕" exp
- First derivation exp ::=[ exp ::=[ exp "+" exp • ] "⊕" exp ]
- Second derivation exp ::=[ exp "+" exp ::=[ exp • "⊕" exp ] ]
+ First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
+ Second 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
- First derivation exp ::=[ exp ::=[ exp "+" exp • ] "⊕" exp ]
- Second derivation exp ::=[ exp "+" exp ::=[ exp • "⊕" exp ] ]
+ First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
+ Second derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
@@ -1751,22 +1751,22 @@ State 8
1 exp: exp "⊕" exp •
1 exp: exp • "⊕" exp
Example exp "⊕" exp • "⊕" exp
- First derivation exp ::=[ exp ::=[ exp "⊕" exp • ] "⊕" exp ]
- Second derivation exp ::=[ exp "⊕" exp ::=[ exp • "⊕" exp ] ]
+ First derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ]
+ Second derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ]
Shift/reduce conflict on token "+":
1 exp: exp "⊕" exp •
2 exp: exp • "+" exp
Example exp "⊕" exp • "+" exp
- First derivation exp ::=[ exp ::=[ exp "⊕" exp • ] "+" exp ]
- Second derivation exp ::=[ exp "⊕" exp ::=[ exp • "+" exp ] ]
+ First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
+ Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Shift/reduce conflict on token "+":
1 exp: exp "⊕" exp •
3 exp: exp • "+" exp
Example exp "⊕" exp • "+" exp
- First derivation exp ::=[ exp ::=[ exp "⊕" exp • ] "+" exp ]
- Second derivation exp ::=[ exp "⊕" exp ::=[ exp • "+" exp ] ]
+ First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
+ Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
]])
--
2.27.0