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% Copyright (c) 1991: Marcel Roelofs and Peter Gragert
% University of Twente, Enschede, The Netherlands
% @@(#) rtangle.ch (91/03/11)
@x
@u
@<Include files@>@;
@<Common code for \.{WEAVE} and \.{TANGLE}@>@;
@<Typedef declarations@>@;
@<Global variables@>@;
@y
@u
#define NEWLINES_IN_MACROS
@<Include files@>@;
@<Common code for \.{WEAVE} and \.{TANGLE}@>@;
@<Typedef declarations@>@;
@<Global variables@>@;
@z
@x
if (isdigit(c) || c=='\\' || c=='.') @<Get a constant@>@;/*spider*/
else if (isalpha(c) || c=='_' || c=='$') @<Get an identifier@>@;/*spider*/
else if (c=='\'' || c=='\"') @<Get a string@>@;/*spider*/
@y
if (isdigit(c)) @<Get a constant@>@;/*spider*/
else if (isalpha(c) || c=='_' || c=='!') @<Get an identifier@>@;/*spider*/
else if (c=='\"') @<Get a string@>@;/*spider*/
@z
@x
@ @<Get an identifier@>= {/*spider*/
id_first=--loc;
while (isalpha(*++loc) || isdigit(*loc) || *loc=='_');
if (*loc=='$') while (isdigit(*++loc)||*loc=='$');
/* make room for \$\$ and \$nnn suffixes */
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 */
@#
/* if it's not a single-character literal, it's a tick mark or an |at_sign| */
if (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_first = mod_text+1;
id_loc = mod_text; *++id_loc=delim;
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@>
}
else if (++id_loc<=mod_text_end) *id_loc=@`\n'; /* will print as
\.{"\\\\\\n"} */
}
if ((c=*loc++)==delim) {
if (++id_loc<=mod_text_end) *id_loc=c;
break;
}
if (c=='\\') {
if (loc>=limit) continue;
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
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