picrin/char.c

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C
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/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
static pic_value
pic_char_char_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_char_p(v) ? pic_true_value() : pic_false_value();
}
static pic_value
pic_char_char_to_integer(pic_state *pic)
{
char c;
pic_get_args(pic, "c", &c);
return pic_int_value(c);
}
static pic_value
pic_char_integer_to_char(pic_state *pic)
{
int i;
pic_get_args(pic, "i", &i);
return pic_char_value(i);
}
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#define DEFINE_CHAR_CMP(op, name) \
static pic_value \
pic_char_##name##_p(pic_state *pic) \
{ \
size_t argc; \
pic_value *argv; \
size_t i; \
char c, d; \
\
pic_get_args(pic, "cc*", &c, &d, &argc, &argv); \
\
if (! (c op d)) \
return pic_false_value(); \
\
for (i = 0; i < argc; ++i) { \
c = d; \
if (pic_char_p(argv[i])) \
d = pic_char(argv[i]); \
else \
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pic_errorf(pic, #op ": char required"); \
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\
if (! (c op d)) \
return pic_false_value(); \
} \
\
return pic_true_value(); \
}
DEFINE_CHAR_CMP(==, eq)
DEFINE_CHAR_CMP(<, lt)
DEFINE_CHAR_CMP(>, gt)
DEFINE_CHAR_CMP(<=, le)
DEFINE_CHAR_CMP(>=, ge)
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void
pic_init_char(pic_state *pic)
{
pic_defun(pic, "char?", pic_char_char_p);
pic_defun(pic, "char->integer", pic_char_char_to_integer);
pic_defun(pic, "integer->char", pic_char_integer_to_char);
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pic_defun(pic, "char=?", pic_char_eq_p);
pic_defun(pic, "char<?", pic_char_lt_p);
pic_defun(pic, "char>?", pic_char_gt_p);
pic_defun(pic, "char<=?", pic_char_le_p);
pic_defun(pic, "char>=?", pic_char_ge_p);
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}