ref: 04e2c93067759dd7376b293a40699e86a16d3262
dir: /string.c/
/*
string functions
*/
#include "llt.h"
#include "flisp.h"
#include "operators.h"
#include "cvalues.h"
#include "print.h"
#include "read.h"
#include "equal.h"
#include "iostream.h"
BUILTIN("string?", stringp)
{
argcount(nargs, 1);
return fl_isstring(args[0]) ? FL(t) : FL(f);
}
BUILTIN("string-length", string_length)
{
size_t start = 0;
if(nargs < 1 || nargs > 3)
argcount(nargs, 1);
if(!fl_isstring(args[0]))
type_error("string", args[0]);
size_t len = cv_len((cvalue_t*)ptr(args[0]));
size_t stop = len;
if(nargs > 1){
start = toulong(args[1]);
if(start > len)
bounds_error(args[0], args[1]);
if(nargs > 2){
stop = toulong(args[2]);
if(stop > len)
bounds_error(args[0], args[2]);
if(stop <= start)
return fixnum(0);
}
}
char *str = cvalue_data(args[0]);
return size_wrap(u8_charnum(str+start, stop-start));
}
BUILTIN("string-width", string_width)
{
argcount(nargs, 1);
if(iscprim(args[0])){
cprim_t *cp = ptr(args[0]);
if(cp_class(cp) == FL(runetype)){
int w = wcwidth(*(Rune*)cp_data(cp));
return w < 0 ? FL(f) : fixnum(w);
}
}
return size_wrap(u8_strwidth(tostring(args[0])));
}
BUILTIN("string-reverse", string_reverse)
{
argcount(nargs, 1);
if(!fl_isstring(args[0]))
type_error("string", args[0]);
size_t len = cv_len(ptr(args[0]));
value_t ns = cvalue_string(len);
u8_reverse(cvalue_data(ns), cvalue_data(args[0]), len);
return ns;
}
BUILTIN("string-encode", string_encode)
{
argcount(nargs, 1);
if(iscvalue(args[0])){
cvalue_t *cv = ptr(args[0]);
fltype_t *t = cv_class(cv);
if(t->eltype == FL(runetype)){
size_t nr = cv_len(cv) / sizeof(Rune);
Rune *r = (Rune*)cv_data(cv);
size_t nb = runenlen(r, nr);
value_t str = cvalue_string(nb);
char *s = cvalue_data(str);
for(size_t i = 0; i < nr; i++)
s += runetochar(s, r+i);
return str;
}
}
type_error("rune array", args[0]);
}
BUILTIN("string-decode", string_decode)
{
int term = 0;
if(nargs == 2)
term = args[1] != FL(f);
else
argcount(nargs, 1);
if(!fl_isstring(args[0]))
type_error("string", args[0]);
cvalue_t *cv = ptr(args[0]);
char *ptr = (char*)cv_data(cv);
size_t nb = cv_len(cv);
size_t nc = utfnlen(ptr, nb);
size_t newsz = nc*sizeof(Rune);
if(term)
newsz += sizeof(Rune);
value_t runestr = cvalue(FL(runestringtype), newsz);
ptr = cv_data(ptr(args[0])); // relocatable pointer
Rune *r = cvalue_data(runestr);
for(size_t i = 0; i < nb; i++)
ptr += chartorune(r+i, ptr);
if(term)
r[nb] = 0;
return runestr;
}
extern BUILTIN("buffer", buffer);
BUILTIN("string", string)
{
if(nargs == 1 && fl_isstring(args[0]))
return args[0];
value_t arg, buf = fn_builtin_buffer(nil, 0);
fl_gc_handle(&buf);
ios_t *s = value2c(ios_t*, buf);
value_t oldpr = symbol_value(FL(printreadablysym));
value_t oldpp = symbol_value(FL(printprettysym));
set(FL(printreadablysym), FL(f));
set(FL(printprettysym), FL(f));
uint32_t i;
FOR_ARGS(i, 0, arg, args){
USED(arg);
fl_print(s, args[i]);
}
set(FL(printreadablysym), oldpr);
set(FL(printprettysym), oldpp);
value_t outp = stream_to_string(&buf);
fl_free_gc_handles(1);
return outp;
}
BUILTIN("string-split", string_split)
{
argcount(nargs, 2);
char *s = tostring(args[0]);
char *delim = tostring(args[1]);
size_t len = cv_len(ptr(args[0]));
size_t dlen = cv_len(ptr(args[1]));
size_t ssz, tokend, tokstart, i = 0;
value_t first = FL(Nil), c = FL(Nil), last;
size_t junk;
fl_gc_handle(&first);
fl_gc_handle(&last);
do{
// find and allocate next token
tokstart = tokend = i;
while(i < len && !u8_memchr(delim, u8_nextmemchar(s, &i), dlen, &junk))
tokend = i;
ssz = tokend - tokstart;
last = c; // save previous cons cell
c = fl_cons(cvalue_string(ssz), FL(Nil));
// we've done allocation; reload movable pointers
s = cv_data(ptr(args[0]));
delim = cv_data(ptr(args[1]));
if(ssz)
memmove(cv_data(ptr(car_(c))), &s[tokstart], ssz);
// link new cell
if(last == FL(Nil))
first = c; // first time, save first cons
else
((cons_t*)ptr(last))->cdr = c;
// note this tricky condition: if the string ends with a
// delimiter, we need to go around one more time to add an
// empty string. this happens when (i == len && tokend < i)
}while(i < len || (i == len && (tokend != i)));
fl_free_gc_handles(2);
return first;
}
BUILTIN("string-sub", string_sub)
{
if(nargs != 2)
argcount(nargs, 3);
char *s = tostring(args[0]);
size_t lenbytes = cv_len((cvalue_t*)ptr(args[0]));
size_t startbytes, n, startchar = toulong(args[1]);
for(startbytes = n = 0; n < startchar && startbytes < lenbytes; n++)
startbytes += u8_seqlen(s+startbytes);
if(n != startchar)
bounds_error(args[0], args[1]);
size_t endbytes = lenbytes;
if(nargs == 3){
size_t endchar = toulong(args[2]);
for(endbytes = startbytes; n < endchar && endbytes < lenbytes; n++)
endbytes += u8_seqlen(s+endbytes);
if(n != endchar)
bounds_error(args[0], args[2]);
}
if(endbytes == startbytes)
return symbol_value(FL(emptystringsym));
value_t ns = cvalue_string(endbytes-startbytes);
s = cvalue_data(args[0]); // reload after alloc
memmove(cv_data(ptr(ns)), s+startbytes, endbytes-startbytes);
return ns;
}
BUILTIN("string-char", string_char)
{
argcount(nargs, 2);
char *s = tostring(args[0]);
size_t lenbytes = cv_len(ptr(args[0]));
size_t startbytes, n, startchar = toulong(args[1]);
for(startbytes = n = 0; n < startchar && startbytes < lenbytes; n++)
startbytes += u8_seqlen(s+startbytes);
if(n != startchar)
bounds_error(args[0], args[1]);
Rune r;
chartorune(&r, s+startbytes);
return mk_rune(r);
}
BUILTIN("char-upcase", char_upcase)
{
argcount(nargs, 1);
cprim_t *cp = (cprim_t*)ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return mk_rune(toupperrune(*(Rune*)cp_data(cp)));
}
BUILTIN("char-downcase", char_downcase)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return mk_rune(tolowerrune(*(Rune*)cp_data(cp)));
}
BUILTIN("char-titlecase", char_titlecase)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return mk_rune(totitlerune(*(Rune*)cp_data(cp)));
}
BUILTIN("char-alphabetic?", char_alphabeticp)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return isalpharune(*(Rune*)cp_data(cp)) ? FL(t) : FL(f);
}
BUILTIN("char-lower-case?", char_lower_casep)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return islowerrune(*(Rune*)cp_data(cp)) ? FL(t) : FL(f);
}
BUILTIN("char-upper-case?", char_upper_casep)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return isupperrune(*(Rune*)cp_data(cp)) ? FL(t) : FL(f);
}
BUILTIN("char-title-case?", char_title_casep)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return istitlerune(*(Rune*)cp_data(cp)) ? FL(t) : FL(f);
}
BUILTIN("char-numeric?", char_numericp)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return isdigitrune(*(Rune*)cp_data(cp)) ? FL(t) : FL(f);
}
BUILTIN("char-whitespace?", char_whitespacep)
{
argcount(nargs, 1);
cprim_t *cp = ptr(args[0]);
if(!iscprim(args[0]) || cp_class(cp) != FL(runetype))
type_error("rune", args[0]);
return isspacerune(*(Rune*)cp_data(cp)) ? FL(t) : FL(f);
}
BUILTIN("string-find", string_find)
{
char cbuf[UTFmax+1];
size_t start = 0;
if(nargs == 3)
start = toulong(args[2]);
else
argcount(nargs, 2);
char *s = tostring(args[0]);
size_t len = cv_len(ptr(args[0]));
if(start > len)
bounds_error(args[0], args[2]);
char *needle; size_t needlesz;
value_t v = args[1];
cprim_t *cp = ptr(v);
if(iscprim(v) && cp_class(cp) == FL(runetype)){
Rune r = *(Rune*)cp_data(cp);
needlesz = runetochar(cbuf, &r);
needle = cbuf;
needle[needlesz] = 0;
}else if(iscprim(v) && cp_class(cp) == FL(bytetype)){
needlesz = 1;
needle = cbuf;
needle[0] = *(char*)cp_data(cp);
needle[needlesz] = 0;
}else if(fl_isstring(v)){
cvalue_t *cv = (cvalue_t*)ptr(v);
needlesz = cv_len(cv);
needle = (char*)cv_data(cv);
}else{
type_error("string", args[1]);
}
if(needlesz > len-start)
return FL(f);
if(needlesz == 0)
return size_wrap(start);
size_t i;
for(i = start; i < len-needlesz+1; i++){
if(s[i] == needle[0] && memcmp(&s[i+1], needle+1, needlesz-1) == 0)
return size_wrap(i);
}
return FL(f);
}
static unsigned long
get_radix_arg(value_t arg)
{
unsigned long radix = toulong(arg);
if(radix < 2 || radix > 36)
lerrorf(FL(ArgError), "invalid radix");
return radix;
}
BUILTIN("number->string", number_2_string)
{
if(nargs < 1 || nargs > 2)
argcount(nargs, 2);
value_t n = args[0];
int neg = 0;
uint64_t num;
if(isfixnum(n))
num = numval(n);
else if(!iscprim(n))
type_error("integer", n);
else
num = conv_to_uint64(cp_data(ptr(n)), cp_numtype(ptr(n)));
if(numval(fl_compare(args[0], fixnum(0))) < 0){
num = -num;
neg = 1;
}
unsigned long radix = 10;
if(nargs == 2)
radix = get_radix_arg(args[1]);
char buf[128];
char *str = uint2str(buf, sizeof(buf), num, radix);
if(neg && str > &buf[0])
*(--str) = '-';
return string_from_cstr(str);
}
BUILTIN("string->number", string_2_number)
{
if(nargs < 1 || nargs > 2)
argcount(nargs, 2);
char *str = tostring(args[0]);
value_t n;
unsigned long radix = 0;
if(nargs == 2)
radix = get_radix_arg(args[1]);
if(!isnumtok_base(str, &n, (int)radix))
return FL(f);
return n;
}
BUILTIN("string-utf8?", string_utf8p)
{
argcount(nargs, 1);
char *s = tostring(args[0]);
size_t len = cv_len((cvalue_t*)ptr(args[0]));
return u8_isvalid(s, len) ? FL(t) : FL(f);
}