423 lines
13 KiB
C
423 lines
13 KiB
C
/*
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string functions
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <setjmp.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include <wchar.h>
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#include <wctype.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <errno.h>
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#include "llt.h"
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#include "flisp.h"
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value_t fl_stringp(value_t *args, u_int32_t nargs)
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{
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argcount("string?", nargs, 1);
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return fl_isstring(args[0]) ? FL_T : FL_F;
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}
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value_t fl_string_count(value_t *args, u_int32_t nargs)
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{
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size_t start = 0;
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if (nargs < 1 || nargs > 3)
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argcount("string.count", nargs, 1);
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if (!fl_isstring(args[0]))
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type_error("string.count", "string", args[0]);
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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size_t stop = len;
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if (nargs > 1) {
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start = toulong(args[1], "string.count");
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if (start > len)
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bounds_error("string.count", args[0], args[1]);
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if (nargs > 2) {
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stop = toulong(args[2], "string.count");
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if (stop > len)
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bounds_error("string.count", args[0], args[2]);
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if (stop <= start)
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return fixnum(0);
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}
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}
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char *str = cvalue_data(args[0]);
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return size_wrap(u8_charnum(str+start, stop-start));
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}
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#if defined(__linux__) || (defined(__APPLE__) && defined(__MACH__))
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extern int wcwidth(uint32_t);
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#else
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#error "wcwidth function not available"
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#endif
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value_t fl_string_width(value_t *args, u_int32_t nargs)
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{
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argcount("string.width", nargs, 1);
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if (iscprim(args[0])) {
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cprim_t *cp = (cprim_t*)ptr(args[0]);
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if (cp_class(cp) == wchartype) {
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int w = wcwidth(*(uint32_t*)cp_data(cp));
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if (w < 0)
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return FL_F;
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return fixnum(w);
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}
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}
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char *s = tostring(args[0], "string.width");
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return size_wrap(u8_strwidth(s));
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}
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value_t fl_string_reverse(value_t *args, u_int32_t nargs)
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{
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argcount("string.reverse", nargs, 1);
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if (!fl_isstring(args[0]))
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type_error("string.reverse", "string", args[0]);
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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value_t ns = cvalue_string(len);
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u8_reverse(cvalue_data(ns), cvalue_data(args[0]), len);
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return ns;
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}
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value_t fl_string_encode(value_t *args, u_int32_t nargs)
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{
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argcount("string.encode", nargs, 1);
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if (iscvalue(args[0])) {
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cvalue_t *cv = (cvalue_t*)ptr(args[0]);
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fltype_t *t = cv_class(cv);
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if (t->eltype == wchartype) {
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size_t nc = cv_len(cv) / sizeof(uint32_t);
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uint32_t *ptr = (uint32_t*)cv_data(cv);
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size_t nbytes = u8_codingsize(ptr, nc);
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value_t str = cvalue_string(nbytes);
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ptr = cv_data((cvalue_t*)ptr(args[0])); // relocatable pointer
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u8_toutf8(cvalue_data(str), nbytes, ptr, nc);
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return str;
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}
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}
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type_error("string.encode", "wchar array", args[0]);
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}
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value_t fl_string_decode(value_t *args, u_int32_t nargs)
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{
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int term=0;
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if (nargs == 2) {
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term = (args[1] != FL_F);
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}
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else {
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argcount("string.decode", nargs, 1);
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}
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if (!fl_isstring(args[0]))
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type_error("string.decode", "string", args[0]);
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cvalue_t *cv = (cvalue_t*)ptr(args[0]);
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char *ptr = (char*)cv_data(cv);
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size_t nb = cv_len(cv);
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size_t nc = u8_charnum(ptr, nb);
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size_t newsz = nc*sizeof(uint32_t);
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if (term) newsz += sizeof(uint32_t);
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value_t wcstr = cvalue(wcstringtype, newsz);
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ptr = cv_data((cvalue_t*)ptr(args[0])); // relocatable pointer
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uint32_t *pwc = cvalue_data(wcstr);
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u8_toucs(pwc, nc, ptr, nb);
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if (term) pwc[nc] = 0;
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return wcstr;
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}
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extern value_t fl_buffer(value_t *args, u_int32_t nargs);
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extern value_t stream_to_string(value_t *ps);
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value_t fl_string(value_t *args, u_int32_t nargs)
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{
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if (nargs == 1 && fl_isstring(args[0]))
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return args[0];
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value_t arg, buf = fl_buffer(NULL, 0);
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ios_t *s = value2c(ios_t*,buf);
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uint32_t i;
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value_t oldpr = symbol_value(printreadablysym);
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value_t oldpp = symbol_value(printprettysym);
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set(printreadablysym, FL_F);
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set(printprettysym, FL_F);
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FOR_ARGS(i,0,arg,args) {
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fl_print(s, args[i]);
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}
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set(printreadablysym, oldpr);
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set(printprettysym, oldpp);
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fl_gc_handle(&buf);
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value_t outp = stream_to_string(&buf);
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fl_free_gc_handles(1);
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return outp;
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}
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value_t fl_string_split(value_t *args, u_int32_t nargs)
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{
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argcount("string.split", nargs, 2);
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char *s = tostring(args[0], "string.split");
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char *delim = tostring(args[1], "string.split");
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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size_t dlen = cv_len((cvalue_t*)ptr(args[1]));
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size_t ssz, tokend=0, tokstart=0, i=0;
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value_t first=FL_NIL, c=FL_NIL, last;
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size_t junk;
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fl_gc_handle(&first);
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fl_gc_handle(&last);
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do {
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// find and allocate next token
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tokstart = tokend = i;
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while (i < len &&
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!u8_memchr(delim, u8_nextmemchar(s, &i), dlen, &junk))
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tokend = i;
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ssz = tokend - tokstart;
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last = c; // save previous cons cell
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c = fl_cons(cvalue_string(ssz), FL_NIL);
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// we've done allocation; reload movable pointers
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s = cv_data((cvalue_t*)ptr(args[0]));
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delim = cv_data((cvalue_t*)ptr(args[1]));
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if (ssz) memcpy(cv_data((cvalue_t*)ptr(car_(c))), &s[tokstart], ssz);
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// link new cell
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if (last == FL_NIL)
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first = c; // first time, save first cons
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else
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((cons_t*)ptr(last))->cdr = c;
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// note this tricky condition: if the string ends with a
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// delimiter, we need to go around one more time to add an
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// empty string. this happens when (i==len && tokend<i)
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} while (i < len || (i==len && (tokend!=i)));
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fl_free_gc_handles(2);
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return first;
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}
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value_t fl_string_sub(value_t *args, u_int32_t nargs)
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{
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if (nargs != 2)
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argcount("string.sub", nargs, 3);
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char *s = tostring(args[0], "string.sub");
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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size_t i1, i2;
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i1 = toulong(args[1], "string.sub");
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if (i1 > len)
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bounds_error("string.sub", args[0], args[1]);
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if (nargs == 3) {
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i2 = toulong(args[2], "string.sub");
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if (i2 > len)
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bounds_error("string.sub", args[0], args[2]);
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}
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else {
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i2 = len;
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}
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if (i2 <= i1)
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return cvalue_string(0);
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value_t ns = cvalue_string(i2-i1);
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memcpy(cv_data((cvalue_t*)ptr(ns)), &s[i1], i2-i1);
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return ns;
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}
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value_t fl_string_char(value_t *args, u_int32_t nargs)
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{
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argcount("string.char", nargs, 2);
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char *s = tostring(args[0], "string.char");
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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size_t i = toulong(args[1], "string.char");
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if (i >= len)
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bounds_error("string.char", args[0], args[1]);
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size_t sl = u8_seqlen(&s[i]);
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if (sl > len || i > len-sl)
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bounds_error("string.char", args[0], args[1]);
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return mk_wchar(u8_nextchar(s, &i));
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}
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value_t fl_char_upcase(value_t *args, u_int32_t nargs)
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{
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argcount("char.upcase", nargs, 1);
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cprim_t *cp = (cprim_t*)ptr(args[0]);
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if (!iscprim(args[0]) || cp_class(cp) != wchartype)
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type_error("char.upcase", "wchar", args[0]);
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return mk_wchar(towupper(*(int32_t*)cp_data(cp)));
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}
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value_t fl_char_downcase(value_t *args, u_int32_t nargs)
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{
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argcount("char.downcase", nargs, 1);
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cprim_t *cp = (cprim_t*)ptr(args[0]);
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if (!iscprim(args[0]) || cp_class(cp) != wchartype)
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type_error("char.downcase", "wchar", args[0]);
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return mk_wchar(towlower(*(int32_t*)cp_data(cp)));
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}
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static value_t mem_find_byte(char *s, char c, size_t start, size_t len)
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{
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char *p = memchr(s+start, c, len-start);
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if (p == NULL)
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return FL_F;
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return size_wrap((size_t)(p - s));
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}
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value_t fl_string_find(value_t *args, u_int32_t nargs)
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{
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char cbuf[8];
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size_t start = 0;
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if (nargs == 3)
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start = toulong(args[2], "string.find");
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else
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argcount("string.find", nargs, 2);
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char *s = tostring(args[0], "string.find");
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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if (start > len)
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bounds_error("string.find", args[0], args[2]);
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char *needle; size_t needlesz;
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value_t v = args[1];
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cprim_t *cp = (cprim_t*)ptr(v);
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if (iscprim(v) && cp_class(cp) == wchartype) {
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uint32_t c = *(uint32_t*)cp_data(cp);
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if (c <= 0x7f)
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return mem_find_byte(s, (char)c, start, len);
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needlesz = u8_toutf8(cbuf, sizeof(cbuf), &c, 1);
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needle = cbuf;
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}
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else if (iscprim(v) && cp_class(cp) == bytetype) {
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return mem_find_byte(s, *(char*)cp_data(cp), start, len);
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}
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else if (fl_isstring(v)) {
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cvalue_t *cv = (cvalue_t*)ptr(v);
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needlesz = cv_len(cv);
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needle = (char*)cv_data(cv);
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}
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else {
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type_error("string.find", "string", args[1]);
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}
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if (needlesz > len-start)
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return FL_F;
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else if (needlesz == 1)
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return mem_find_byte(s, needle[0], start, len);
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else if (needlesz == 0)
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return size_wrap(start);
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size_t i;
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for(i=start; i < len-needlesz+1; i++) {
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if (s[i] == needle[0]) {
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if (!memcmp(&s[i+1], needle+1, needlesz-1))
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return size_wrap(i);
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}
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}
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return FL_F;
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}
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value_t fl_string_inc(value_t *args, u_int32_t nargs)
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{
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if (nargs < 2 || nargs > 3)
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argcount("string.inc", nargs, 2);
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char *s = tostring(args[0], "string.inc");
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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size_t i = toulong(args[1], "string.inc");
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size_t cnt = 1;
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if (nargs == 3)
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cnt = toulong(args[2], "string.inc");
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while (cnt--) {
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if (i >= len)
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bounds_error("string.inc", args[0], args[1]);
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(void)(isutf(s[++i]) || isutf(s[++i]) || isutf(s[++i]) || ++i);
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}
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return size_wrap(i);
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}
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value_t fl_string_dec(value_t *args, u_int32_t nargs)
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{
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if (nargs < 2 || nargs > 3)
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argcount("string.dec", nargs, 2);
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char *s = tostring(args[0], "string.dec");
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size_t len = cv_len((cvalue_t*)ptr(args[0]));
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size_t i = toulong(args[1], "string.dec");
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size_t cnt = 1;
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if (nargs == 3)
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cnt = toulong(args[2], "string.dec");
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// note: i is allowed to start at index len
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if (i > len)
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bounds_error("string.dec", args[0], args[1]);
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while (cnt--) {
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if (i == 0)
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bounds_error("string.dec", args[0], args[1]);
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(void)(isutf(s[--i]) || isutf(s[--i]) || isutf(s[--i]) || --i);
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}
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return size_wrap(i);
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}
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static unsigned long get_radix_arg(value_t arg, char *fname)
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{
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unsigned long radix = toulong(arg, fname);
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if (radix < 2 || radix > 36)
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lerrorf(ArgError, "%s: invalid radix", fname);
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return radix;
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}
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value_t fl_numbertostring(value_t *args, u_int32_t nargs)
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{
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if (nargs < 1 || nargs > 2)
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argcount("number->string", nargs, 2);
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value_t n = args[0];
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int neg = 0;
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uint64_t num;
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if (isfixnum(n)) num = numval(n);
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else if (!iscprim(n)) type_error("number->string", "integer", n);
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else num = conv_to_uint64(cp_data((cprim_t*)ptr(n)),
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cp_numtype((cprim_t*)ptr(n)));
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if (numval(fl_compare(args[0],fixnum(0))) < 0) {
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num = -num;
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neg = 1;
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}
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unsigned long radix = 10;
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if (nargs == 2)
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radix = get_radix_arg(args[1], "number->string");
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char buf[128];
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char *str = uint2str(buf, sizeof(buf), num, radix);
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if (neg && str > &buf[0])
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*(--str) = '-';
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return string_from_cstr(str);
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}
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value_t fl_stringtonumber(value_t *args, uint32_t nargs)
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{
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if (nargs < 1 || nargs > 2)
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argcount("string->number", nargs, 2);
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char *str = tostring(args[0], "string->number");
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value_t n;
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unsigned long radix = 0;
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if (nargs == 2)
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radix = get_radix_arg(args[1], "string->number");
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if (!isnumtok_base(str, &n, (int)radix))
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return FL_F;
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return n;
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}
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static builtinspec_t stringfunc_info[] = {
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{ "string", fl_string },
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{ "string?", fl_stringp },
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{ "string.count", fl_string_count },
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{ "string.width", fl_string_width },
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{ "string.split", fl_string_split },
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{ "string.sub", fl_string_sub },
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{ "string.find", fl_string_find },
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{ "string.char", fl_string_char },
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{ "string.inc", fl_string_inc },
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{ "string.dec", fl_string_dec },
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{ "string.reverse", fl_string_reverse },
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{ "string.encode", fl_string_encode },
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{ "string.decode", fl_string_decode },
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{ "char.upcase", fl_char_upcase },
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{ "char.downcase", fl_char_downcase },
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{ "number->string", fl_numbertostring },
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{ "string->number", fl_stringtonumber },
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{ NULL, NULL }
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};
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void stringfuncs_init()
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{
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assign_global_builtins(stringfunc_info);
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}
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