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fix error handling in read to do what it should do.

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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@517 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
This commit is contained in:
vsc 2002-06-05 01:22:57 +00:00
parent f19c10ca6c
commit 3a660ed7af
3 changed files with 52 additions and 20 deletions
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36
C/iopreds.c
View File

@ -2836,7 +2836,7 @@ p_get_read_error_handler(void)
static Int
p_read (void)
{ /* '$read'(+Flag,?Term,?Vars) */
{ /* '$read'(+Flag,?Term,?Vars,-Err) */
Term t, v;
TokEntry *tokstart, *fast_tokenizer (void);
#if EMACS
@ -2894,16 +2894,26 @@ p_read (void)
}
TR = old_TR;
if (parser_error_style == QUIET_ON_PARSER_ERROR) {
/* just fail */
return(FALSE);
}
if (ErrorMessage) {
Error(SYNTAX_ERROR,syntax_error(tokstart),ErrorMessage);
return(FALSE);
} else if (parser_error_style == FAIL_ON_PARSER_ERROR) {
return(FALSE);
} else if (parser_error_style == CONTINUE_ON_PARSER_ERROR) {
ErrorMessage = NULL;
/* try again */
goto repeat_cycle;
} else {
Error(SYNTAX_ERROR,syntax_error(tokstart),"SYNTAX ERROR");
return(FALSE);
Term terr = syntax_error(tokstart);
if (ErrorMessage == NULL)
ErrorMessage = "SYNTAX ERROR";
if (parser_error_style == EXCEPTION_ON_PARSER_ERROR) {
Error(SYNTAX_ERROR,terr,ErrorMessage);
return(FALSE);
} else /* FAIL ON PARSER ERROR */ {
Term t[2];
t[0] = terr;
t[1] = MkAtomTerm(LookupAtom(ErrorMessage));
return(unify(ARG4,MkApplTerm(MkFunctor(LookupAtom("error"),2),2,t)));
}
}
} else {
/* parsing succeeded */
@ -2939,12 +2949,12 @@ p_read (void)
static Int
p_read2 (void)
{ /* '$read2'(+Flag,?Term,?Vars,+Stream) */
{ /* '$read2'(+Flag,?Term,?Vars,-Err,+Stream) */
int old_c_stream = c_input_stream;
Int out;
/* needs to change c_output_stream for write */
c_input_stream = CheckStream (ARG4, Input_Stream_f, "read/3");
c_input_stream = CheckStream (ARG5, Input_Stream_f, "read/3");
if (c_input_stream == -1) {
c_input_stream = old_c_stream;
return(FALSE);
@ -4858,8 +4868,8 @@ InitIOPreds(void)
InitCPred ("$put_byte", 2, p_put_byte, SafePredFlag|SyncPredFlag);
InitCPred ("$set_read_error_handler", 1, p_set_read_error_handler, SafePredFlag|SyncPredFlag);
InitCPred ("$get_read_error_handler", 1, p_get_read_error_handler, SafePredFlag|SyncPredFlag);
InitCPred ("$read", 3, p_read, SyncPredFlag);
InitCPred ("$read", 4, p_read2, SyncPredFlag);
InitCPred ("$read", 4, p_read, SyncPredFlag);
InitCPred ("$read", 5, p_read2, SyncPredFlag);
InitCPred ("$set_input", 1, p_set_input, SafePredFlag|SyncPredFlag);
InitCPred ("$set_output", 1, p_set_output, SafePredFlag|SyncPredFlag);
InitCPred ("$skip", 2, p_skip, SafePredFlag|SyncPredFlag);

10
pl/boot.yap
View File

@ -122,10 +122,12 @@ read_sig.
/* main execution loop */
'$read_vars'(Stream,T,V) :-
current_input(Old),
'$set_input'(Stream),
'$read'(true,T,V),
'$set_input'(Old).
'$read'(true,T,V,Err,Stream),
(nonvar(Err) ->
'$print_message'(error,Err), fail
;
true
).
% reset alarms when entering top-level.
'$enter_top_level' :-

26
pl/yio.yap
View File

@ -314,22 +314,42 @@ told :- current_output(Stream), '$close'(Stream), set_output(user).
/* Term IO */
read(T) :- '$read'(false,T,[]).
read(T) :-
'$read'(false,T,V,Err),
(nonvar(Err) ->
'$print_message'(error,Err), fail
;
true
).
read(Stream,T) :-
'$read'(false,T,V,Err,Stream),
(nonvar(Err) ->
'$print_message'(error,Err), fail
;
true
).
'$read'(false,T,_,Stream).
read_term(T, Options) :-
'$check_io_opts'(Options,read_term(T, Options)),
'$preprocess_read_terms_options'(Options),
'$read'(true,T,VL),
'$read_vars'(T,VL),
'$postprocess_read_terms_options'(Options, T, VL).
'$read_vars'(T,V) :-
'$read'(true,T,V,Err),
(nonvar(Err) ->
'$print_message'(error,Err), fail
;
true
).
read_term(Stream, T, Options) :-
'$check_io_opts'(Options,read_term(T, Options)),
'$preprocess_read_terms_options'(Options),
'$read'(true,T,VL,Stream),
'$read_vars'(Strem,T,VL),
'$postprocess_read_terms_options'(Options, T, VL).
%