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SMV: rewrite assignment grammar rules #1509

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Merged
kroening merged 1 commit into from
Dec 22, 2025
Merged

SMV: rewrite assignment grammar rules #1509

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43 changes: 20 additions & 23 deletions src/smvlang/parser.y
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Original file line number Diff line number Diff line change
Expand Up @@ -401,7 +401,7 @@ simple_var_list:
;

define_declaration:
DEFINE_Token defines
DEFINE_Token define_body
| DEFINE_Token
;

Expand Down Expand Up @@ -648,36 +648,27 @@ assignments: assignment
| assignments assignment
;

assignment : assignment_head '(' assignment_var ')' BECOMES_Token formula ';'
assignment : init_Token '(' complex_identifier ')' BECOMES_Token simple_expr ';'
{
if(stack_expr($1).id()==ID_smv_next)
{
PARSER.module->add_assign_next(
unary_exprt{ID_smv_next, std::move(stack_expr($3))},
std::move(stack_expr($6)));
}
else
PARSER.module->add_assign_init(std::move(stack_expr($3)), std::move(stack_expr($6)));
PARSER.module->add_assign_init(std::move(stack_expr($3)), std::move(stack_expr($6)));
}
| assignment_var BECOMES_Token formula ';'
| next_Token '(' complex_identifier ')' BECOMES_Token next_expr ';'
{
PARSER.module->add_assign_next(
unary_exprt{ID_smv_next, std::move(stack_expr($3))},
std::move(stack_expr($6)));
}
| complex_identifier BECOMES_Token formula ';'
{
PARSER.module->add_assign_current(std::move(stack_expr($1)), std::move(stack_expr($3)));
}
;

assignment_var: variable_identifier
;

assignment_head:
init_Token { init($$, ID_init); }
| next_Token { init($$, ID_smv_next); }
;

defines: define
| defines define
define_body: define
| define_body define
;

define : assignment_var BECOMES_Token formula ';'
define : complex_identifier BECOMES_Token next_expr ';'
{
PARSER.module->add_define(std::move(stack_expr($1)), std::move(stack_expr($3)));
}
Expand Down Expand Up @@ -724,6 +715,12 @@ word_constant:
}
;

next_expr : basic_expr
;

simple_expr: basic_expr
;

basic_expr : constant
| identifier
{
Expand All @@ -743,7 +740,7 @@ basic_expr : constant
// This rule is part of "complex_identifier" in the NuSMV manual.
init($$, ID_smv_self);
}
| basic_expr '(' basic_expr ')'
| basic_expr '(' simple_expr ')'
{
// Not in the NuSMV grammar.
binary($$, $1, ID_index, $3);
Expand Down
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