164 lines
3.1 KiB
C
164 lines
3.1 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include "picrin.h"
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#include "picrin/string.h"
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pic_sym
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pic_intern(pic_state *pic, const char *str, size_t len)
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{
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char *cstr;
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xh_entry *e;
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pic_sym id;
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cstr = (char *)pic_malloc(pic, len + 1);
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cstr[len] = '\0';
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memcpy(cstr, str, len);
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e = xh_get_str(&pic->syms, cstr);
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if (e) {
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return xh_val(e, pic_sym);
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}
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id = pic->sym_cnt++;
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xh_put_str(&pic->syms, cstr, &id);
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xh_put_int(&pic->sym_names, id, &cstr);
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return id;
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}
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pic_sym
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pic_intern_cstr(pic_state *pic, const char *str)
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{
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return pic_intern(pic, str, strlen(str));
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}
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pic_sym
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pic_intern_str(pic_state *pic, pic_str *str)
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{
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return pic_intern_cstr(pic, pic_str_cstr(str));
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}
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pic_sym
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pic_gensym(pic_state *pic, pic_sym base)
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{
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int uid = pic->uniq_sym_cnt++, len;
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char *str, mark;
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pic_sym uniq;
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if (pic_interned_p(pic, base)) {
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mark = '@';
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} else {
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mark = '.';
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}
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len = snprintf(NULL, 0, "%s%c%d", pic_symbol_name(pic, base), mark, uid);
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str = pic_alloc(pic, (size_t)len + 1);
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sprintf(str, "%s%c%d", pic_symbol_name(pic, base), mark, uid);
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/* don't put the symbol to pic->syms to keep it uninterned */
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uniq = pic->sym_cnt++;
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xh_put_int(&pic->sym_names, uniq, &str);
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return uniq;
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}
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pic_sym
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pic_ungensym(pic_state *pic, pic_sym base)
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{
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const char *name, *occr;
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if (pic_interned_p(pic, base)) {
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return base;
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}
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name = pic_symbol_name(pic, base);
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if ((occr = strrchr(name, '@')) == NULL) {
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pic_panic(pic, "logic flaw");
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}
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return pic_intern(pic, name, (size_t)(occr - name));
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}
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bool
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pic_interned_p(pic_state *pic, pic_sym sym)
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{
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return sym == pic_intern_cstr(pic, pic_symbol_name(pic, sym));
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}
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const char *
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pic_symbol_name(pic_state *pic, pic_sym sym)
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{
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return xh_val(xh_get_int(&pic->sym_names, sym), const char *);
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}
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static pic_value
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pic_symbol_symbol_p(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_bool_value(pic_sym_p(v));
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}
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static pic_value
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pic_symbol_symbol_eq_p(pic_state *pic)
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{
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int argc, i;
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pic_value *argv;
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pic_get_args(pic, "*", &argc, &argv);
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for (i = 0; i < argc; ++i) {
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if (! pic_sym_p(argv[i])) {
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return pic_false_value();
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}
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if (! pic_eq_p(argv[i], argv[0])) {
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return pic_false_value();
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}
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}
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return pic_true_value();
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}
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static pic_value
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pic_symbol_symbol_to_string(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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if (! pic_sym_p(v)) {
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pic_errorf(pic, "symbol->string: expected symbol");
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}
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return pic_obj_value(pic_make_str_cstr(pic, pic_symbol_name(pic, pic_sym(v))));
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}
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static pic_value
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pic_symbol_string_to_symbol(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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if (! pic_str_p(v)) {
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pic_errorf(pic, "string->symbol: expected string");
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}
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return pic_symbol_value(pic_intern_cstr(pic, pic_str_cstr(pic_str_ptr(v))));
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}
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void
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pic_init_symbol(pic_state *pic)
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{
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pic_defun(pic, "symbol?", pic_symbol_symbol_p);
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pic_defun(pic, "symbol->string", pic_symbol_symbol_to_string);
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pic_defun(pic, "string->symbol", pic_symbol_string_to_symbol);
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pic_defun(pic, "symbol=?", pic_symbol_symbol_eq_p);
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}
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