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% Copyright (c) 1991: Marcel Roelofs and Peter Gragert
% University of Twente, Enschede, The Netherlands
% @@(#) rweave.ch (91/03/11)
@x
if (isdigit(c)) @<Get a constant@>@; /*spider*/
else if (isalpha(c) || c=='_') @<Get an identifier@>@;/*spider*/
else if (c=='\'' || c=='"') @<Get a string@>@;/*spider*/
@y
if (isdigit(c)) @<Get a constant@>@;/*spider*/
else if (isalpha(c) || c=='_' || c=='!') @<Get an identifier@>@;/*spider*/
else if (c=='\"') @<Get a string@>@;/*spider*/
@z
@x
@ @<Get an identifier@>= {/*spider*/
id_first=--loc;
while (isalpha(*++loc) || isdigit(*loc) || *loc=='_');
id_loc=loc; return(identifier);
}
@y
@ @<Get an identifier@>= {/*spider*/
id_first=--loc;
if (c=='!') ++loc;
while (isalpha(*++loc) || isdigit(*loc) || *loc=='_' || *loc=='!')
if (*loc=='!') ++loc;
id_loc=loc; return(identifier);
}
@z
@x
@ \cee\ strings and character constants, delimited by double and single
quotes, respectively, can contain newlines or instances of their own
delimiters if they are protected by a backslash. We follow this
convention, but do not allow the string to be longer than |longest_name|.
@<Get a string@>= {/*spider*/
ASCII delim = c; /* what started the string */
id_first = mod_text+1;
id_loc = mod_text;
if (delim=='`' && *(loc-2)==at_sign) {
/* make string begin with |"@@`"| */
*++id_loc=at_sign;
*++id_loc=at_sign;
}
/* this is hack for ascii constant */
@#
/* if it's not a single-character literal, it's a tick mark or an |at_sign| */
if ((delim=='\'' || delim == '`') &&
(loc+1>=limit ||
(*loc != '\\' && *loc!=at_sign && loc[1]!='\'') ||
(*loc=='\\' && (loc+2>=limit||loc[2]!='\'')) ||
(*loc==at_sign &&
(loc+2>=limit||loc[1]!=at_sign||loc[2]!='\''))
)
) goto mistake;
*++id_loc=delim;
if (delim=='`') delim='\''; /* for |ascii_constant|s */
while (1) {
if (loc>=limit) {
if(*(limit-1)!='\\') {
err_print("! String didn't end"); loc=limit; break;
@.String didn't end@>
}
if(get_line()==0) {
err_print("! Input ended in middle of string"); loc=buffer; break;
@.Input ended in middle of string@>
}
}
if ((c=*loc++)==delim) {
if (++id_loc<=mod_text_end) *id_loc=c;
break;
}
if (c=='\\') if (loc>=limit) continue;
else if (++id_loc<=mod_text_end) {
*id_loc = '\\'; c=*loc++;
}
if (++id_loc<=mod_text_end) *id_loc=c;
}
if (id_loc>=mod_text_end) {
printf("\n! String too long: ");
@.String too long@>
ASCII_write(mod_text+1,25);
printf("..."); mark_error;
}
id_loc++;
return(string);
}
@y
@ \cee\ strings are delimited by double quotes and must be restricted
to one line. Double quotes in strings must be doubled and we allow no
string to be longer than |longest_name|.
@<Get a string@>= {/*spider*/
ASCII delim = c; /* what started the string */
@#
id_first = mod_text+1;
id_loc = mod_text; *++id_loc=delim;
while (1) {
if (loc>=limit) {
err_print("! String didn't end"); loc=limit;
@.String didn't end@>
if (get_line()==0) {
err_print("! Input ended in middle of string"); loc=buffer;
@.Input ended in middle of string@>
}
break;
}
if ((c=*loc++)==delim) {
if (++id_loc<=mod_text_end) *id_loc=c;
if (*loc==delim) loc++;
else break;
}
if (++id_loc<=mod_text_end) *id_loc=c;
}
if (id_loc>=mod_text_end) {
printf("\n! String too long: ");
@.String too long@>
ASCII_write(mod_text+1,25);
printf("..."); mark_error;
}
id_loc++;
return(string);
}
@z
@x
case 1: printf("\\{"); print_id((name_dir+r)); printf("}"); break;
/* |id_flag| */
case 2: printf("\&{"); print_id((name_dir+r)); printf("}"); break;
@y
case 1: printf("\\\\{"); print_id((name_dir+r)); printf("}"); break;
/* |id_flag| */
case 2: printf("\\&{"); print_id((name_dir+r)); printf("}"); break;
@z
@x
@ @<Start a format...@>= {
app_str("\\F"); app_scrap(SP_ignore_scrap,no_math);
/* this will produce `\&{format}' */
@.\\F@>
@<Set |next_control| to the first non-newline token@>@;
/* claim at this point |scrap_ptr==scrap_info+1| */
if (scrap_ptr!=scrap_info+1) {
err_print("! This can't happen -- bad scrap_ptr in format definition");
printf("\n\tscrap_ptr-scrap_info==%d\n",scrap_ptr-scrap_info);
}
if (next_control==identifier) {
small_app(id_flag+id_lookup(id_first, id_loc,normal)-name_dir);
app_str(" ");
app_scrap(SP_ignore_scrap,no_math); /*spider*/
/* this is syntactically separate from what follows */
@<Set |next_control| to the first non-newline token@>@;
if (next_control==identifier) {
small_app(id_flag+id_lookup(id_first, id_loc,normal)-name_dir);
small_app(@`\n');
app_scrap(SP_ignore_scrap,no_math);
@<Set |next_control| to the first non-newline token@>@;
}
}
/* if everything went well, we appended two scraps */
if (scrap_ptr!=scrap_info+3) err_print("! Improper format definition");
@.Improper format definition@>
}
@y
@ @<Start a format...@>= {
small_app(backup); app_str("\\F"); app_scrap(SP_ignore_scrap,no_math);
/* this will produce `\&{format}' */
@.\\F@>
@<Set |next_control| to the first non-newline token@>@;
/* claim at this point |scrap_ptr==scrap_info+1| */
if (scrap_ptr!=scrap_info+1) {
err_print("! This can't happen -- bad scrap_ptr in format definition");
printf("\n\tscrap_ptr-scrap_info==%d\n",scrap_ptr-scrap_info);
}
if (next_control==identifier) {
small_app(id_flag+id_lookup(id_first, id_loc,normal)-name_dir);
app_str(" ");
app_scrap(SP_ignore_scrap,no_math); /*spider*/
/* this is syntactically separate from what follows */
@<Set |next_control| to the first non-newline token@>@;
if (next_control==identifier) {
small_app(id_flag+id_lookup(id_first, id_loc,normal)-name_dir);
small_app(@`\n');
app_scrap(SP_ignore_scrap,no_math);
@<Set |next_control| to the first non-newline token@>@;
}
}
/* if everything went well, we appended two scraps */
if (scrap_ptr!=scrap_info+2) err_print("! Improper format definition");
@.Improper format definition@>
}
@z
@x
if (cur_xref->num%def_flag!=module_count) {
app_str("+"); /*module name is multiply defined*/
this_module=name_dir; /*so we won't give cross-reference info here*/
}
app_str("\\S"); /* output an equivalence sign */
@y
if (cur_xref->num%def_flag!=module_count) {
app_str("\\PS"); /*module name is multiply defined*/
this_module=name_dir; /*so we won't give cross-reference info here*/
}
else app_str("\\S"); /* output an equivalence sign */
@z
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