diogo/yap-6.3
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make var names available as a global var

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This commit is contained in:
Vítor Santos Costa 2015-03-04 09:40:21 +00:00
parent 0839baf638
commit 8a4257d80a
2 changed files with 31 additions and 5 deletions
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13
os/pl-read.c
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@ -1067,6 +1067,7 @@ txt.encoding = ENC_UTF8;
txt.canonical = FALSE;
rval = PL_unify_text(term, 0, &txt, PL_ATOM);
LD->read_varnames = rd.varnames;
out:
free_read_data(&rd);
@ -1171,6 +1172,7 @@ read_clause(IOSTREAM *s, term_t term, term_t options ARG_LD)
(!tpos || (rval=unify_read_term_position(tpos PASS_LD))) )
{
PredEntry *ap;
LD->read_varnames = rd.varnames;
if (rd.singles) {
// warning, singletons([X=_A],f(X,Y,Z), pos).
@ -1343,6 +1345,7 @@ if ( Sferror(s) ) {
free_read_data(&rd);
return FALSE;
}
LD->read_varnames = rd.varnames;
#ifdef O_QUASIQUOTATIONS
if ( rval )
rval = parse_quasi_quotations(&rd PASS_LD);
@ -1570,6 +1573,14 @@ PRED_IMPL("term_to_atom", 2, term_to_atom, 0)
{ return atom_to_term(A2, A1, 0);
}
static
PRED_IMPL("$context_variables", 1, context_variables, 0)
{ CACHE_REGS
if ( LOCAL_VarNames == (CELL)0 )
return Yap_unify( TermNil, ARG1);
return Yap_unify( LOCAL_VarNames, ARG1);
}
static
PRED_IMPL("$set_source", 2, set_source, 0)
{
@ -1601,6 +1612,7 @@ init_read_data(&rd, stream PASS_LD);
PL_put_variable(t);
if ( !(rval = read_term(t, &rd PASS_LD)) && rd.has_exception )
PL_put_term(t, rd.exception);
LOCAL_VarNames = rd.varnames;
free_read_data(&rd);
Sclose(stream);
LD->read_source = oldsrc;
@ -1618,6 +1630,7 @@ PRED_DEF("read_term", 2, read_term, PL_FA_ISO)
PRED_DEF("read_clause", 3, read_clause, 0)
PRED_DEF("atom_to_term", 3, atom_to_term, 0)
PRED_DEF("term_to_atom", 2, term_to_atom, 0)
PRED_DEF("$context_variables", 1, context_variables, 0)
PRED_DEF("$set_source", 2, set_source, 0)
#ifdef O_QUASIQUOTATIONS
PRED_DEF("$qq_open", 2, qq_open, 0)

13
pl/hacks.yap
View File

@ -22,6 +22,18 @@
display_pc/3,
code_location/3]).
/** hacks:context_variables(-NamedVariables)
Access variable names.
Unify NamedVariables with a list of terms _Name_=_V_
giving the names of the variables occurring in the last term read.
Notice that variable names option must have been on.
*/
hacks:context_variables(NamedVariables) :-
'$context_variables'(NamedVariables).
prolog:'$stack_dump' :-
yap_hacks:current_choicepoints(CPs),
yap_hacks:current_continuations([Env|Envs]),
@ -228,3 +240,4 @@ beautify_hidden_goal('$list_clauses'(Stream,M,Pred),prolog) -->
[listing(Stream,M:Pred)].