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Maple strings start with '`'
tangle.web line 1074
@x
if (isdigit(c) || c=='\\' || c=='.') @<Get a constant@>@;/*spider*/
else if (isalpha(c) || c=='_' || c=='$') @<Get an identifier@>@;/*spider*/
else if (c=='\'' || c=='\"') @<Get a string@>@;/*spider*/
@y
if (isdigit(c) || c=='.') @<Get a constant@>@;/*spider*/
else if (isalpha(c) || c=='_' || c=='\\') @<Get an identifier@>@;/*spider*/
else if (c=='`' ) @<Get a string@>@;/*spider*/
@z
@x
@ @<Get an identifier@>= {/*spider*/
id_first=--loc;
while (isalpha(*++loc) || isdigit(*loc) || *loc=='_');
if (*loc=='$') while (isdigit(*++loc)||*loc=='$');
/* make room for \$\$ and \$nnn suffixes */
id_loc=loc; return(identifier);
}
@y
@ @<Get an identifier@>= {/*spider*/
id_first=--loc;
while (isalpha(*++loc) || isdigit(*loc) || *loc=='_' || *loc=='\\');
id_loc=loc; return(identifier);
}
@z
Maple allows e.g. 1234\4567 for 'better' readability
tangle.web line 1092
@x
@ @<Get a constant@>= {/*spider*/
id_first=loc-1;
if (*id_first=='.' && !isdigit(*loc)) goto mistake; /* not a constant */
if (*id_first=='\\') while (isdigit(*loc)) loc++; /* octal constant */
else {
if (*id_first=='0') {
if (*loc=='x' || *loc=='X') { /* hex constant */
loc++; while (isxdigit(*loc)) loc++; goto found;
}
}
while (isdigit(*loc)) loc++;
if (*loc=='.') {
loc++;
while (isdigit(*loc)) loc++;
}
if (*loc=='e' || *loc=='E') { /* float constant */
if (*++loc=='+' || *loc=='-') loc++;
while (isdigit(*loc)) loc++;
}
}
found:
id_loc=loc;
return(constant);
}
@y
@ @<Get a constant@>= {/*spider*/
id_first=loc-1;
if (*id_first=='.' && !isdigit(*loc)) goto mistake; /* not a constant */
if (*id_first=='\\') while (isdigit(*loc)) loc++; /* octal constant */
else {
if (*id_first=='0') {
if (*loc=='x' || *loc=='X') { /* hex constant */
loc++; while (isxdigit(*loc)) loc++; goto found;
}
}
while (isdigit(*loc)) loc++;
if (*loc=='.' || *loc=='\\') {
loc++;
while (isdigit(*loc)) loc++;
}
if (*loc=='e' || *loc=='E') { /* float constant */
if (*++loc=='+' || *loc=='-') loc++;
while (isdigit(*loc)) loc++;
}
}
found:
id_loc=loc;
return(constant);
}
@z
tangle.web line 1122
@x
@<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
@<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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