nc-opt-dest nc-formula-or-ident
%type nc-transition nc-src-dest
%type nc-transitions nc-transition-block
%type nc-one-ident nc-ident-list
%type acceptance-cond
/**** LBTT tokens *****/
// Also using INT, STRING
%token ENDAUT "-1"
%token LBTT "LBTT header"
%token INT_S "state acceptance"
%token LBTT_EMPTY "acceptance sets for empty automaton"
%token ACC "acceptance set"
%token STATE_NUM "state number"
%token DEST_NUM "destination number"
%type lbtt-acc
%destructor { delete $$; }
%destructor { bdd_delref($$); }
%destructor { bdd_delref($$->first); delete $$->second; delete $$; }
%destructor { delete $$; }
%destructor {
for (std::list::iterator i = $$->begin();
i != $$->end(); ++i)
{
bdd_delref(i->first);
delete i->second;
}
delete $$;
}
%printer {
if ($$)
debug_stream() << *$$;
else
debug_stream() << "\"\""; }
%printer { debug_stream() << $$; }
%%
aut: aut-1 { res.h->loc = @$; YYACCEPT; }
| ENDOFFILE { YYABORT; }
| error ENDOFFILE { YYABORT; }
aut-1: hoa
| never
| lbtt
/**********************************************************************/
/* Rules for HOA */
/**********************************************************************/
hoa: header "--BODY--" body "--END--"
hoa: error "--END--"
string_opt: { $$ = nullptr; }
| STRING { $$ = $1; }
BOOLEAN: 't' | 'f'
header: format-version header-items
{
// Preallocate the states if we know their number.
if (res.states >= 0)
{
unsigned states = res.states;
for (auto& p : res.start)
if ((unsigned) res.states <= p.second)
{
error(p.first,
"initial state number is larger than state count...");
error(res.states_loc, "... declared here.");
states = std::max(states, p.second + 1);
}
res.h->aut->new_states(states);
res.info_states.resize(states);
}
if (res.accset < 0)
{
error(@$, "missing 'Acceptance:' header");
res.ignore_acc = true;
}
// Process properties.
{
auto explicit_labels = res.props.find("explicit-labels");
auto implicit_labels = res.props.find("implicit-labels");
if (implicit_labels != res.props.end())
{
if (explicit_labels == res.props.end())
{
res.label_style = Implicit_Labels;
}
else
{
error(implicit_labels->second,
"'property: implicit-labels' is incompatible "
"with...");
error(explicit_labels->second,
"... 'property: explicit-labels'.");
}
}
auto trans_labels = res.props.find("trans-labels");
auto state_labels = res.props.find("state-labels");
if (trans_labels != res.props.end())
{
if (state_labels == res.props.end())
{
if (res.label_style != Implicit_Labels)
res.label_style = Trans_Labels;
}
else
{
error(trans_labels->second,
"'property: trans-labels' is incompatible with...");
error(state_labels->second,
"... 'property: state-labels'.");
}
}
else if (state_labels != res.props.end())
{
if (res.label_style != Implicit_Labels)
{
res.label_style = State_Labels;
}
else
{
error(state_labels->second,
"'property: state-labels' is incompatible with...");
error(implicit_labels->second,
"... 'property: implicit-labels'.");
}
}
auto state_acc = res.props.find("state-acc");
auto trans_acc = res.props.find("trans-acc");
if (trans_acc != res.props.end())
{
if (state_acc == res.props.end())
{
res.acc_style = Trans_Acc;
}
else
{
error(trans_acc->second,
"'property: trans-acc' is incompatible with...");
error(state_acc->second,
"... 'property: state-acc'.");
}
}
else if (state_acc != res.props.end())
{
res.acc_style = State_Acc;
}
}
{
unsigned ss = res.start.size();
if (ss > 1)
{
auto det = res.props.find("deterministic");
if (det != res.props.end())
{
error(det->second,
"deterministic automata should have at most "
"one initial state");
}
res.deterministic = false;
}
else
{
// Assume the automaton is deterministic until proven
// wrong.
res.deterministic = true;
}
if (ss < 1)
{
auto complete = res.props.find("complete");
if (complete != res.props.end())
{
error(complete->second,
"complete automata should have at least "
"one initial state");
}
res.complete = false;
}
else
{
// Assume the automaton is complete until proven
// wrong.
res.complete = true;
}
}
}
version: IDENTIFIER
{
if (*$1 != "v1")
error(@$, "unsupported version of the HOA format");
delete $1;
}
format-version: "HOA:" { res.h->loc = @1; } version
| error "HOA:"
{ error(@1, "ignoring leading garbage");
res.h->loc = @2; }
version
header-items: | header-items header-item
header-item: "States:" INT
{
if (res.states >= 0)
{
error(@$, "redefinition of the number of states...");
error(res.states_loc, "... previously defined here.");
}
else
{
res.states_loc = @$;
}
if (((int) $2) < 0)
{
error(@$, "too many states for this implementation");
YYABORT;
}
res.states = std::max(res.states, (int) $2);
}
| "Start:" state-conj-2
{
error(@2, "alternation is not yet supported");
YYABORT;
}
| "Start:" state-num
{
res.start.emplace_back(@$, $2);
}
| "AP:" INT {
if (res.ignore_more_ap)
{
error(@1, "ignoring this redeclaration of APs...");
error(res.ap_loc, "... previously declared here.");
}
else
{
res.ap_count = $2;
res.ap.reserve($2);
}
}
ap-names
{
if (!res.ignore_more_ap)
{
res.ap_loc = @1 + @2;
if ((int) res.ap.size() != res.ap_count)
{
std::ostringstream out;
out << "found " << res.ap.size()
<< " atomic propositions instead of the "
<< res.ap_count << " announced";
error(@$, out.str());
}
res.ignore_more_ap = true;
}
}
| "Alias:" ANAME label-expr
{
if (!res.alias.emplace(*$2, bdd_from_int($3)).second)
{
std::ostringstream o;
o << "ignoring redefinition of alias @" << *$2;
error(@$, o.str());
}
delete $2;
bdd_delref($3);
}
| "Acceptance:" INT
{
if (res.ignore_more_acc)
{
error(@1 + @2, "ignoring this redefinition of the "
"acceptance condition...");
error(res.accset_loc, "... previously defined here.");
}
else if ($2 > 8 * sizeof(spot::acc_cond::mark_t::value_t))
{
error(@1 + @2,
"this implementation cannot support such a large "
"number of acceptance sets");
YYABORT;
}
else
{
res.h->aut->acc().add_sets($2);
res.accset = $2;
res.accset_loc = @1 + @2;
}
}
acceptance-cond
{
res.ignore_more_acc = true;
res.h->aut->set_acceptance($2, *$4);
delete $4;
}
| "acc-name:" IDENTIFIER acc-spec
{
delete $2;
}
| "tool:" STRING string_opt
{
delete $2;
delete $3;
}
| "name:" STRING
{
res.h->aut->set_named_prop("automaton-name", $2);
}
| "properties:" properties
| HEADERNAME header-spec
{
char c = (*$1)[0];
if (c >= 'A' && c <= 'Z')
error(@$, "ignoring unsupported header \"" + *$1 + ":\"\n\t"
"(but the capital indicates information that should not"
" be ignored)");
delete $1;
}
| error
ap-names: | ap-names ap-name
ap-name: STRING
{
if (!res.ignore_more_ap)
{
auto f = res.env->require(*$1);
auto d = res.h->aut->get_dict();
int b = 0;
if (f == nullptr)
{
std::ostringstream out;
out << "unknown atomic proposition \"" << *$1 << "\"";
error(@1, out.str());
f = spot::ltl::default_environment::instance()
.require("$unknown$");
b = d->register_proposition(f, res.h->aut);
}
else
{
b = d->register_proposition(f, res.h->aut);
if (!res.ap_set.emplace(b).second)
{
std::ostringstream out;
out << "duplicate atomic proposition \"" << *$1 << "\"";
error(@1, out.str());
}
}
f->destroy();
res.ap.push_back(b);
}
delete $1;
}
acc-spec: | acc-spec BOOLEAN
| acc-spec INT
| acc-spec IDENTIFIER
{
delete $2;
}
properties: | properties IDENTIFIER
{
res.props.emplace(*$2, @2);
delete $2;
}
header-spec: | header-spec BOOLEAN
| header-spec INT
| header-spec STRING
{
delete $2;
}
| header-spec IDENTIFIER
{
delete $2;
}
state-conj-2: checked-state-num '&' checked-state-num
| state-conj-2 '&' checked-state-num
label-expr: 't'
{
$$ = bddtrue.id();
}
| 'f'
{
$$ = bddfalse.id();
}
| INT
{
if ($1 >= res.ap.size())
{
error(@1, "AP number is larger than the number of APs...");
error(res.ap_loc, "... declared here");
$$ = bddtrue.id();
}
else
{
$$ = bdd_ithvar(res.ap[$1]).id();
bdd_addref($$);
}
}
| ANAME
{
auto i = res.alias.find(*$1);
if (i == res.alias.end())
{
error(@$, "unknown alias @" + *$1);
$$ = 1;
}
else
{
$$ = i->second.id();
bdd_addref($$);
}
delete $1;
}
| '!' label-expr
{
$$ = bdd_not($2);
bdd_delref($2);
bdd_addref($$);
}
| label-expr '&' label-expr
{
$$ = bdd_and($1, $3);
bdd_delref($1);
bdd_delref($3);
bdd_addref($$);
}
| label-expr '|' label-expr
{
$$ = bdd_or($1, $3);
bdd_delref($1);
bdd_delref($3);
bdd_addref($$);
}
| '(' label-expr ')'
{
$$ = $2;
}
acc-set: INT
{
if ((int) $1 >= res.accset)
{
if (!res.ignore_acc)
{
error(@1, "number is larger than the count "
"of acceptance sets...");
error(res.accset_loc, "... declared here.");
}
$$ = -1U;
}
else
{
$$ = $1;
}
}
acceptance-cond: IDENTIFIER '(' acc-set ')'
{
if ($3 != -1U)
{
res.pos_acc_sets |= res.h->aut->acc().mark($3);
if (*$1 == "Inf")
$$ = new spot::acc_cond::acc_code
(res.h->aut->acc().inf({$3}));
else
$$ = new spot::acc_cond::acc_code
(res.h->aut->acc().fin({$3}));
}
else
{
$$ = new spot::acc_cond::acc_code;
}
delete $1;
}
| IDENTIFIER '(' '!' acc-set ')'
{
if ($4 != -1U)
{
res.neg_acc_sets |= res.h->aut->acc().mark($4);
if (*$1 == "Inf")
$$ = new spot::acc_cond::acc_code
(res.h->aut->acc().inf_neg({$4}));
else
$$ = new spot::acc_cond::acc_code
(res.h->aut->acc().fin_neg({$4}));
}
else
{
$$ = new spot::acc_cond::acc_code;
}
delete $1;
}
| '(' acceptance-cond ')'
{
$$ = $2;
}
| acceptance-cond '&' acceptance-cond
{
$3->append_and(std::move(*$1));
$$ = $3;
delete $1;
}
| acceptance-cond '|' acceptance-cond
{
$3->append_or(std::move(*$1));
$$ = $3;
delete $1;
}
| 't'
{
$$ = new spot::acc_cond::acc_code;
}
| 'f'
{
{
$$ = new spot::acc_cond::acc_code(res.h->aut->acc().fin({}));
}
}
body: states
{
for (auto& p: res.start)
if (p.second >= res.info_states.size()
|| !res.info_states[p.second].declared)
{
error(p.first,
"initial state " + std::to_string(p.second) +
" has no definition");
// Pretend that the state is declared so we do not
// mention it in the next loop.
if (p.second < res.info_states.size())
res.info_states[p.second].declared = true;
}
unsigned n = res.info_states.size();
// States with number above res.states have already caused a
// diagnostic, so let not add another one.
if (res.states >= 0)
n = res.states;
for (unsigned i = 0; i < n; ++i)
{
auto& p = res.info_states[i];
if (p.used && !p.declared)
error(p.used_loc,
"state " + std::to_string(i) + " has no definition");
}
}
state-num: INT
{
if (((int) $1) < 0)
{
error(@1, "state number is too large for this implementation");
YYABORT;
}
$$ = $1;
}
checked-state-num: state-num
{
if ((int) $1 >= res.states)
{
if (res.states >= 0)
{
error(@1, "state number is larger than state "
"count...");
error(res.states_loc, "... declared here.");
}
int missing =
((int) $1) - res.h->aut->num_states() + 1;
if (missing >= 0)
{
res.h->aut->new_states(missing);
res.info_states.resize
(res.info_states.size() + missing);
}
}
// Remember the first place were a state is the
// destination of a transition.
if (!res.info_states[$1].used)
{
res.info_states[$1].used = true;
res.info_states[$1].used_loc = @1;
}
$$ = $1;
}
states: | states state
{
if (res.deterministic || res.complete)
{
bdd available = bddtrue;
bool det = true;
for (auto& t: res.h->aut->out(res.cur_state))
{
if (det && !bdd_implies(t.cond, available))
det = false;
available -= t.cond;
}
if (res.deterministic && !det)
{
res.deterministic = false;
auto p = res.props.find("deterministic");
if (p != res.props.end())
{
error(@2, "automaton is not deterministic...");
error(p->second, "... despite 'property: deterministic'");
}
}
if (res.complete && available != bddfalse)
{
res.complete = false;
auto p = res.props.find("complete");
if (p != res.props.end())
{
error(@2, "automaton is not complete...");
error(p->second, "... despite 'property: complete'");
}
}
}
}
state: state-name labeled-edges
| state-name unlabeled-edges
{
if (!res.has_state_label) // Implicit labels
{
if (res.cur_guard != res.guards.end())
error(@$, "not enough transitions for this state");
if (res.label_style == State_Labels)
{
error(@2, "these transitions have implicit labels but the"
" automaton is...");
error(res.props["state-labels"], "... declared with "
"'property: state-labels'");
// Do not repeat this message.
res.label_style = Mixed_Labels;
}
res.cur_guard = res.guards.begin();
}
}
| error
{
// Assume the worse.
res.deterministic = false;
res.complete = false;
}
state-name: "State:" state-label_opt checked-state-num string_opt state-acc_opt
{
res.cur_state = $3;
if (res.info_states[$3].declared)
{
std::ostringstream o;
o << "redeclaration of state " << $3;
error(@1 + @3, o.str());
}
res.info_states[$3].declared = true;
res.acc_state = $5;
if ($4)
{
if (!res.state_names)
res.state_names =
new std::vector(res.states > 0 ?
res.states : 0);
if (res.state_names->size() < $3 + 1)
res.state_names->resize($3 + 1);
(*res.state_names)[$3] = std::move(*$4);
delete $4;
}
}
label: '[' label-expr ']'
{
res.cur_label = bdd_from_int($2);
bdd_delref($2);
}
| '[' error ']'
{
error(@$, "ignoring this invalid label");
res.cur_label = bddtrue;
}
state-label_opt: { res.has_state_label = false; }
| label
{
res.has_state_label = true;
res.state_label_loc = @1;
res.state_label = res.cur_label;
if (res.label_style == Trans_Labels
|| res.label_style == Implicit_Labels)
{
error(@$,
"state label used although the automaton was...");
if (res.label_style == Trans_Labels)
error(res.props["trans-labels"],
"... declared with 'property: trans-labels' here");
else
error(res.props["implicit-labels"],
"... declared with 'property: implicit-labels' "
"here");
// Do not show this error anymore.
res.label_style = Mixed_Labels;
}
}
trans-label: label
{
if (res.has_state_label)
{
error(@1, "cannot label this edge because...");
error(res.state_label_loc,
"... the state is already labeled.");
res.cur_label = res.state_label;
}
if (res.label_style == State_Labels
|| res.label_style == Implicit_Labels)
{
error(@$, "transition label used although the "
"automaton was...");
if (res.label_style == State_Labels)
error(res.props["state-labels"],
"... declared with 'property: state-labels' "
"here");
else
error(res.props["implicit-labels"],
"... declared with 'property: implicit-labels' "
"here");
// Do not show this error anymore.
res.label_style = Mixed_Labels;
}
}
acc-sig: '{' acc-sets '}'
{
$$ = $2;
if (res.ignore_acc && !res.ignore_acc_silent)
{
error(@$, "ignoring acceptance sets because of "
"missing acceptance condition");
// Emit this message only once.
res.ignore_acc_silent = true;
}
}
| '{' error '}'
{
error(@$, "ignoring this invalid acceptance set");
}
acc-sets:
{
$$ = spot::acc_cond::mark_t(0U);
}
| acc-sets acc-set
{
if (res.ignore_acc || $2 == -1U)
$$ = spot::acc_cond::mark_t(0U);
else
$$ = $1 | res.h->aut->acc().mark($2);
}
state-acc_opt:
{
$$ = spot::acc_cond::mark_t(0U);
}
| acc-sig
{
$$ = $1;
if (res.acc_style == Trans_Acc)
{
error(@$, "state-based acceptance used despite...");
error(res.props["trans-acc"],
"... declaration of transition-based acceptance.");
res.acc_style = Mixed_Acc;
}
}
trans-acc_opt:
{
$$ = spot::acc_cond::mark_t(0U);
}
| acc-sig
{
$$ = $1;
res.trans_acc_seen = true;
if (res.acc_style == State_Acc)
{
error(@$, "trans-based acceptance used despite...");
error(res.props["state-acc"],
"... declaration of state-based acceptance.");
res.acc_style = Mixed_Acc;
}
}
/* block of labeled-edges, with occasional (incorrect) unlabeled edge */
labeled-edges: | some-labeled-edges
some-labeled-edges: labeled-edge
| some-labeled-edges labeled-edge
| some-labeled-edges incorrectly-unlabeled-edge
incorrectly-unlabeled-edge: checked-state-num trans-acc_opt
{
bdd cond = bddtrue;
if (!res.has_state_label)
error(@$, "missing label for this edge "
"(previous edge is labeled)");
else
cond = res.state_label;
res.h->aut->new_transition(res.cur_state, $1,
cond,
$2 | res.acc_state);
}
labeled-edge: trans-label checked-state-num trans-acc_opt
{
if (res.cur_label != bddfalse)
res.h->aut->new_transition(res.cur_state, $2,
res.cur_label,
$3 | res.acc_state);
}
| trans-label state-conj-2 trans-acc_opt
{
error(@2, "alternation is not yet supported");
YYABORT;
}
/* Block of unlabeled edge, with occasional (incorrect) labeled
edge. We never have zero unlabeled edges, these are considered as
zero labeled edges. */
unlabeled-edges: unlabeled-edge
| unlabeled-edges unlabeled-edge
| unlabeled-edges incorrectly-labeled-edge
unlabeled-edge: checked-state-num trans-acc_opt
{
bdd cond;
if (res.has_state_label)
{
cond = res.state_label;
}
else
{
if (res.guards.empty())
fill_guards(res);
if (res.cur_guard == res.guards.end())
{
error(@$, "too many transition for this state, "
"ignoring this one");
cond = bddfalse;
}
else
{
cond = *res.cur_guard++;
}
}
if (cond != bddfalse)
res.h->aut->new_transition(res.cur_state, $1,
cond, $2 | res.acc_state);
}
| state-conj-2 trans-acc_opt
{
error(@1, "alternation is not yet supported");
YYABORT;
}
incorrectly-labeled-edge: trans-label unlabeled-edge
{
error(@1, "ignoring this label, because previous"
" edge has no label");
}
/**********************************************************************/
/* Rules for neverclaims */
/**********************************************************************/
never: "never" { res.namer = res.h->aut->create_namer();
res.h->aut->set_buchi();
res.h->aut->prop_state_based_acc();
res.acc_state = State_Acc;
res.pos_acc_sets = res.h->aut->acc().all_sets();
}
'{' nc-states '}'
{
// Add an accept_all state if needed.
if (res.accept_all_needed && !res.accept_all_seen)
{
unsigned n = res.namer->new_state("accept_all");
res.h->aut->new_acc_transition(n, n, bddtrue);
}
// If we aliased existing state, we have some unreachable
// states to remove.
if (res.aliased_states)
res.h->aut->purge_unreachable_states();
res.info_states.resize(res.h->aut->num_states());
// Pretend that we have declared all states.
for (auto& p: res.info_states)
p.declared = true;
}
nc-states:
/* empty */
| nc-state
| nc-states ';' nc-state
| nc-states ';'
nc-one-ident: IDENTIFIER ':'
{
auto r = res.labels.insert(std::make_pair(*$1, @1));
if (!r.second)
{
error(@1, std::string("redefinition of ") + *$1 + "...");
error(r.first->second, std::string("... ") + *$1
+ " previously defined here");
}
$$ = $1;
}
nc-ident-list: nc-one-ident
{
unsigned n = res.namer->new_state(*$1);
if (res.start.empty())
{
// The first state is initial.
res.start.emplace_back(@$, n);
}
$$ = $1;
}
| nc-ident-list nc-one-ident
{
res.aliased_states |=
res.namer->alias_state(res.namer->get_state(*$1), *$2);
// Keep any identifier that starts with accept.
if (strncmp("accept", $1->c_str(), 6))
{
delete $1;
$$ = $2;
}
else
{
delete $2;
$$ = $1;
}
}
nc-transition-block:
"if" nc-transitions "fi"
{
$$ = $2;
}
| "do" nc-transitions "od"
{
$$ = $2;
}
nc-state:
nc-ident-list "skip"
{
if (*$1 == "accept_all")
res.accept_all_seen = true;
auto acc = !strncmp("accept", $1->c_str(), 6) ?
res.h->aut->acc().all_sets() : spot::acc_cond::mark_t(0U);
res.namer->new_transition(*$1, *$1, bddtrue, acc);
delete $1;
}
| nc-ident-list { delete $1; }
| nc-ident-list "false" { delete $1; }
| nc-ident-list nc-transition-block
{
auto acc = !strncmp("accept", $1->c_str(), 6) ?
res.h->aut->acc().all_sets() : spot::acc_cond::mark_t(0U);
for (auto& p: *$2)
{
bdd c = bdd_from_int(p.first);
bdd_delref(p.first);
res.namer->new_transition(*$1, *p.second, c, acc);
delete p.second;
}
delete $1;
delete $2;
}
nc-transitions:
/* empty */ { $$ = new std::list; }
| nc-transitions nc-transition
{
if ($2)
{
$1->push_back(*$2);
delete $2;
}
$$ = $1;
}
nc-formula-or-ident: FORMULA | IDENTIFIER
nc-formula: nc-formula-or-ident
{
auto i = res.fcache.find(*$1);
if (i == res.fcache.end())
{
spot::ltl::parse_error_list pel;
auto f = spot::ltl::parse_boolean(*$1, pel, *res.env,
debug_level(), true);
for (auto& j: pel)
{
// Adjust the diagnostic to the current position.
spot::location here = @1;
here.end.line = here.begin.line + j.first.end.line - 1;
here.end.column = here.begin.column + j.first.end.column - 1;
here.begin.line += j.first.begin.line - 1;
here.begin.column += j.first.begin.column - 1;
error_list.emplace_back(here, j.second);
}
bdd cond = bddfalse;
if (f)
{
cond = spot::formula_to_bdd(f, res.h->aut->get_dict(),
res.h->aut);
f->destroy();
}
$$ = (res.fcache[*$1] = cond).id();
}
else
{
$$ = i->second.id();
}
bdd_addref($$);
delete $1;
}
| "false"
{
$$ = 0;
}
nc-opt-dest:
/* empty */
{
$$ = 0;
}
| "->" "goto" IDENTIFIER
{
$$ = $3;
}
| "->" "assert" FORMULA
{
delete $3;
$$ = new std::string("accept_all");
res.accept_all_needed = true;
}
nc-src-dest: nc-formula nc-opt-dest
{
// If there is no destination, do ignore the transition.
// This happens for instance with
// if
// :: false
// fi
if (!$2)
{
$$ = 0;
}
else
{
$$ = new pair($1, $2);
res.namer->new_state(*$2);
}
}
nc-transition:
':' ':' "atomic" '{' nc-src-dest '}'
{
$$ = $5;
}
| ':' ':' nc-src-dest
{
$$ = $3;
}
/**********************************************************************/
/* Rules for LBTT */
/**********************************************************************/
lbtt: lbtt-header lbtt-body ENDAUT
{
auto& acc = res.h->aut->acc();
unsigned num = acc.num_sets();
res.h->aut->set_generalized_buchi(num);
res.pos_acc_sets = acc.all_sets();
assert(!res.states_map.empty());
auto n = res.states_map.size();
if (n != (unsigned) res.states)
{
std::ostringstream err;
err << res.states << " states have been declared, but "
<< n << " different state numbers have been used";
error(@$, err.str());
}
if (res.states_map.rbegin()->first > (unsigned) res.states)
{
// We have seen numbers larger that the total number of
// states in the automaton. Usually this happens when the
// states are numbered from 1 instead of 0, but the LBTT
// documentation actually allow any number to be used.
// What we have done is to map all input state numbers 0
// <= .. < n to the digraph states with the same number,
// and any time we saw a number larger than n, we mapped
// it to a new state. The correspondence is given by
// res.states_map. Now we just need to remove the useless
// states we allocated.
std::vector rename(res.h->aut->num_states(), -1U);
unsigned s = 0;
for (auto& i: res.states_map)
rename[i.second] = s++;
assert(s == (unsigned) res.states);
for (auto& i: res.start)
i.second = rename[i.second];
res.h->aut->get_graph().defrag_states(std::move(rename), s);
}
res.info_states.resize(res.h->aut->num_states());
for (auto& s: res.info_states)
s.declared = true;
}
| lbtt-header-states LBTT_EMPTY
{
res.h->aut->set_generalized_buchi($2);
res.pos_acc_sets = res.h->aut->acc().all_sets();
}
lbtt-header-states: LBTT
{
res.states = $1;
res.states_loc = @1;
res.h->aut->new_states($1);
}
lbtt-header: lbtt-header-states INT_S
{
res.acc_mapper = new spot::acc_mapper_int(res.h->aut, $2);
res.h->aut->prop_state_based_acc();
res.acc_state = State_Acc;
}
| lbtt-header-states INT
{
res.acc_mapper = new spot::acc_mapper_int(res.h->aut, $2);
res.trans_acc_seen = true;
}
lbtt-body: lbtt-states
lbtt-states:
| lbtt-states lbtt-state lbtt-transitions
lbtt-state: STATE_NUM INT lbtt-acc
{
if ($1 >= (unsigned) res.states)
{
auto p = res.states_map.emplace($1, 0);
if (p.second)
p.first->second = res.h->aut->new_state();
res.cur_state = p.first->second;
}
else
{
res.states_map.emplace($1, $1);
res.cur_state = $1;
}
if ($2)
res.start.emplace_back(@1 + @2, res.cur_state);
res.acc_state = $3;
}
lbtt-acc: { $$ = 0U; }
| lbtt-acc ACC
{
$$ = $1;
auto p = res.acc_mapper->lookup($2);
if (p.first)
$$ |= p.second;
else
error(@2, "more acceptance sets used than declared");
}
lbtt-guard: STRING
{
spot::ltl::parse_error_list pel;
auto* f = spot::ltl::parse_lbt(*$1, pel, *res.env);
if (!f || !pel.empty())
{
std::string s = "failed to parse guard: ";
s += *$1;
error(@$, s);
}
if (!pel.empty())
for (auto& j: pel)
{
// Adjust the diagnostic to the current position.
spot::location here = @1;
here.end.line = here.begin.line + j.first.end.line - 1;
here.end.column = here.begin.column + j.first.end.column - 1;
here.begin.line += j.first.begin.line - 1;
here.begin.column += j.first.begin.column - 1;
error_list.emplace_back(here, j.second);
}
if (!f)
{
res.cur_label = bddtrue;
}
else
{
res.cur_label =
formula_to_bdd(f, res.h->aut->get_dict(), res.h->aut);
f->destroy();
}
delete $1;
}
lbtt-transitions:
| lbtt-transitions DEST_NUM lbtt-acc lbtt-guard
{
unsigned dst = $2;
if (dst >= (unsigned) res.states)
{
auto p = res.states_map.emplace(dst, 0);
if (p.second)
p.first->second = res.h->aut->new_state();
dst = p.first->second;
}
else
{
res.states_map.emplace(dst, dst);
}
res.h->aut->new_transition(res.cur_state, dst,
res.cur_label,
res.acc_state | $3);
}
%%
static void fill_guards(result_& r)
{
spot::bdd_dict_ptr d = r.h->aut->get_dict();
unsigned nap = r.ap.size();
int* vars = new int[nap];
for (unsigned i = 0; i < nap; ++i)
vars[i] = r.ap[nap - 1 - i];
// build the 2^nap possible guards
r.guards.reserve(1U << nap);
for (size_t i = 0; i < (1U << nap); ++i)
r.guards.push_back(bdd_ibuildcube(i, nap, vars));
r.cur_guard = r.guards.begin();
delete[] vars;
}
void
hoayy::parser::error(const location_type& location,
const std::string& message)
{
error_list.emplace_back(location, message);
}
static spot::acc_cond::acc_code
fix_acceptance_aux(spot::acc_cond& acc,
spot::acc_cond::acc_code in, unsigned pos,
spot::acc_cond::mark_t onlyneg,
spot::acc_cond::mark_t both,
unsigned base)
{
auto& w = in[pos];
switch (w.op)
{
case spot::acc_cond::acc_op::And:
{
unsigned sub = pos - w.size;
--pos;
auto c = fix_acceptance_aux(acc, in, pos, onlyneg, both, base);
pos -= in[pos].size;
while (sub < pos)
{
--pos;
c.append_and(fix_acceptance_aux(acc, in, pos, onlyneg, both, base));
pos -= in[pos].size;
}
return c;
}
case spot::acc_cond::acc_op::Or:
{
unsigned sub = pos - w.size;
--pos;
auto c = fix_acceptance_aux(acc, in, pos, onlyneg, both, base);
pos -= in[pos].size;
while (sub < pos)
{
--pos;
c.append_or(fix_acceptance_aux(acc, in, pos, onlyneg, both, base));
pos -= in[pos].size;
}
return c;
}
case spot::acc_cond::acc_op::Inf:
return acc.inf(in[pos - 1].mark);
case spot::acc_cond::acc_op::Fin:
return acc.fin(in[pos - 1].mark);
case spot::acc_cond::acc_op::FinNeg:
{
auto m = in[pos - 1].mark;
auto c = acc.fin(onlyneg & m);
spot::acc_cond::mark_t tmp = 0U;
for (auto i: both.sets())
{
if (m.has(i))
tmp.set(base);
++base;
}
if (tmp)
c.append_or(acc.fin(tmp));
return c;
}
case spot::acc_cond::acc_op::InfNeg:
{
auto m = in[pos - 1].mark;
auto c = acc.inf(onlyneg & m);
spot::acc_cond::mark_t tmp = 0U;
for (auto i: both.sets())
{
if (m.has(i))
tmp.set(base);
++base;
}
if (tmp)
c.append_and(acc.inf(tmp));
return c;
}
}
SPOT_UNREACHABLE();
return {};
}
static void fix_acceptance(result_& r)
{
auto& acc = r.h->aut->acc();
// If a set x appears only as Inf(!x), we can complement it so that
// we work with Inf(x) instead.
auto onlyneg = r.neg_acc_sets - r.pos_acc_sets;
if (onlyneg)
{
for (auto& t: r.h->aut->transition_vector())
t.acc ^= onlyneg;
}
// However if set x is used elsewhere, for instance in
// Inf(!x) & Inf(x)
// complementing x would be wrong. We need to create a
// new set, y, that is the complement of x, and rewrite
// this as Inf(y) & Inf(x).
auto both = r.neg_acc_sets & r.pos_acc_sets;
unsigned base = 0;
if (both)
{
auto v = acc.sets(both);
auto vs = v.size();
base = acc.add_sets(vs);
for (auto& t: r.h->aut->transition_vector())
if ((t.acc & both) != both)
for (unsigned i = 0; i < vs; ++i)
if (!t.acc.has(v[i]))
t.acc |= acc.mark(base + i);
}
if (onlyneg || both)
{
auto& acc = r.h->aut->acc();
auto code = acc.get_acceptance();
r.h->aut->set_acceptance(acc.num_sets(),
fix_acceptance_aux(acc, code, code.size() - 1,
onlyneg, both, base));
}
}
static void fix_initial_state(result_& r)
{
std::vector start;
start.reserve(r.start.size());
for (auto& p : r.start)
// Ignore initial states without declaration
if (p.second < r.info_states.size()
&& r.info_states[p.second].declared)
start.push_back(p.second);
if (start.empty())
{
// If no initial state has been declared, add one, because
// Spot will not work without one.
r.h->aut->set_init_state(r.h->aut->new_state());
return;
}
// Remove any duplicate initial state.
std::sort(start.begin(), start.end());
auto res = std::unique(start.begin(), start.end());
start.resize(std::distance(start.begin(), res));
assert(start.size() >= 1);
if (start.size() == 1)
{
r.h->aut->set_init_state(start.front());
}
else
{
// Multiple initial states. We might need to add a fake one,
// unless one of the actual initial state has no incoming edge.
auto& aut = r.h->aut;
std::vector has_incoming(aut->num_states(), 0);
for (auto& t: aut->transitions())
has_incoming[t.dst] = true;
bool found = false;
unsigned init = 0;
for (auto p: start)
if (!has_incoming[p])
{
init = p;
found = true;
}
if (!found)
// We do need a fake initial state
init = aut->new_state();
aut->set_init_state(init);
for (auto p: start)
if (p != init)
for (auto& t: aut->out(p))
aut->new_transition(init, t.dst, t.cond);
}
}
static void fix_properties(result_& r)
{
r.h->aut->prop_deterministic(r.deterministic);
//r.h->aut->prop_complete(r.complete);
if (r.acc_style == State_Acc ||
(r.acc_style == Mixed_Acc && !r.trans_acc_seen))
r.h->aut->prop_state_based_acc();
}
namespace spot
{
hoa_stream_parser::hoa_stream_parser(const std::string& name,
bool ignore_abort)
: filename_(name), ignore_abort_(ignore_abort)
{
if (hoayyopen(name))
throw std::runtime_error(std::string("Cannot open file ") + name);
}
hoa_stream_parser::hoa_stream_parser(int fd,
const std::string& name,
bool ignore_abort)
: filename_(name), ignore_abort_(ignore_abort)
{
if (hoayyopen(fd))
throw std::runtime_error(std::string("Cannot open file ") + name);
}
hoa_stream_parser::~hoa_stream_parser()
{
hoayyclose();
}
hoa_aut_ptr
hoa_stream_parser::parse(hoa_parse_error_list& error_list,
const bdd_dict_ptr& dict,
ltl::environment& env,
bool debug)
{
restart:
result_ r;
r.h = std::make_shared();
r.h->aut = make_twa_graph(dict);
r.env = &env;
hoayy::parser parser(error_list, r, last_loc);
static bool env_debug = !!getenv("SPOT_DEBUG_PARSER");
parser.set_debug_level(debug || env_debug);
hoayyreset();
try
{
if (parser.parse())
r.h->aut = nullptr;
}
catch (const spot::hoa_abort& e)
{
r.h->aborted = true;
// Bison 3.0.2 lacks a += operator for locations.
r.h->loc = r.h->loc + e.pos;
}
last_loc = r.h->loc;
last_loc.step();
if (r.h->aborted)
{
if (ignore_abort_)
goto restart;
return r.h;
}
if (!r.h->aut)
return nullptr;
if (r.state_names)
r.h->aut->set_named_prop("state-names", r.state_names);
fix_acceptance(r);
fix_initial_state(r);
fix_properties(r);
return r.h;
};
twa_graph_ptr
hoa_stream_parser::parse_strict(const bdd_dict_ptr& dict,
ltl::environment& env,
bool debug)
{
hoa_parse_error_list pel;
auto a = parse(pel, dict, env, debug);
if (!pel.empty())
{
std::ostringstream s;
if (format_hoa_parse_errors(s, filename_, pel))
throw parse_error(s.str());
}
if (!a)
return nullptr;
if (a->aborted)
throw parse_error("parsing aborted");
return a->aut;
}
}
// Local Variables:
// mode: c++
// End: