120 lines
2.3 KiB
C
120 lines
2.3 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 <assert.h>
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#include "picrin.h"
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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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xh_entry *e;
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pic_sym id;
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e = xh_get(pic->sym_tbl, str);
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if (e) {
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return e->val;
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}
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str = pic_strdup(pic, str);
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if (pic->slen >= pic->scapa) {
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#if DEBUG
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puts("sym_pool realloced");
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#endif
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pic->scapa *= 2;
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pic->sym_pool = pic_realloc(pic, pic->sym_pool, sizeof(const char *) * pic->scapa);
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}
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id = pic->slen++;
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pic->sym_pool[id] = str;
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xh_put(pic->sym_tbl, str, id);
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return id;
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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 s = ++pic->uniq_sym_count;
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char *str;
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pic_sym uniq;
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str = (char *)pic_alloc(pic, strlen(pic_symbol_name(pic, base)) + (int)log10(s) + 3);
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sprintf(str, "%s@%d", pic_symbol_name(pic, base), s);
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/* don't put the symbol to pic->sym_tbl to keep it uninterned */
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if (pic->slen >= pic->scapa) {
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pic->scapa *= 2;
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pic->sym_pool = pic_realloc(pic, pic->sym_pool, sizeof(const char *) * pic->scapa);
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}
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uniq = pic->slen++;
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pic->sym_pool[uniq] = str;
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return uniq;
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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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assert(sym >= 0);
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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 pic->sym_pool[sym];
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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_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_error(pic, "symbol->string: expected symbol");
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}
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return pic_obj_value(pic_str_new_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_error(pic, "string->symbol: expected string");
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}
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return pic_symbol_value(pic_intern_cstr(pic, pic_str_ptr(v)->str));
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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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}
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