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/*
** range.c - Range class
**
** See Copyright Notice in mruby.h
*/
#include <mruby.h>
#include <mruby/class.h>
#include <mruby/range.h>
#include <mruby/string.h>
#include <mruby/array.h>
#define RANGE_CLASS (mrb_class_get(mrb, "Range"))
static void
range_check(mrb_state *mrb, mrb_value a, mrb_value b)
{
mrb_value ans;
enum mrb_vtype ta;
enum mrb_vtype tb;
ta = mrb_type(a);
tb = mrb_type(b);
if ((ta == MRB_TT_FIXNUM || ta == MRB_TT_FLOAT) &&
(tb == MRB_TT_FIXNUM || tb == MRB_TT_FLOAT)) {
return;
}
ans = mrb_funcall(mrb, a, "<=>", 1, b);
if (mrb_nil_p(ans)) {
/* can not be compared */
mrb_raise(mrb, E_ARGUMENT_ERROR, "bad value for range");
}
}
MRB_API mrb_value
mrb_range_new(mrb_state *mrb, mrb_value beg, mrb_value end, mrb_bool excl)
{
struct RRange *r;
range_check(mrb, beg, end);
r = (struct RRange*)mrb_obj_alloc(mrb, MRB_TT_RANGE, RANGE_CLASS);
r->edges = (mrb_range_edges *)mrb_malloc(mrb, sizeof(mrb_range_edges));
r->edges->beg = beg;
r->edges->end = end;
r->excl = excl;
return mrb_range_value(r);
}
/*
* call-seq:
* rng.first => obj
* rng.begin => obj
*
* Returns the first object in <i>rng</i>.
*/
mrb_value
mrb_range_beg(mrb_state *mrb, mrb_value range)
{
struct RRange *r = mrb_range_ptr(range);
return r->edges->beg;
}
/*
* call-seq:
* rng.end => obj
* rng.last => obj
*
* Returns the object that defines the end of <i>rng</i>.
*
* (1..10).end #=> 10
* (1...10).end #=> 10
*/
mrb_value
mrb_range_end(mrb_state *mrb, mrb_value range)
{
struct RRange *r = mrb_range_ptr(range);
return r->edges->end;
}
/*
* call-seq:
* range.exclude_end? => true or false
*
* Returns <code>true</code> if <i>range</i> excludes its end value.
*/
mrb_value
mrb_range_excl(mrb_state *mrb, mrb_value range)
{
struct RRange *r = mrb_range_ptr(range);
return mrb_bool_value(r->excl);
}
static void
range_init(mrb_state *mrb, mrb_value range, mrb_value beg, mrb_value end, mrb_bool exclude_end)
{
struct RRange *r = mrb_range_ptr(range);
range_check(mrb, beg, end);
r->excl = exclude_end;
if (!r->edges) {
r->edges = (mrb_range_edges *)mrb_malloc(mrb, sizeof(mrb_range_edges));
}
r->edges->beg = beg;
r->edges->end = end;
}
/*
* call-seq:
* Range.new(start, end, exclusive=false) => range
*
* Constructs a range using the given <i>start</i> and <i>end</i>. If the third
* parameter is omitted or is <code>false</code>, the <i>range</i> will include
* the end object; otherwise, it will be excluded.
*/
mrb_value
mrb_range_initialize(mrb_state *mrb, mrb_value range)
{
mrb_value beg, end;
mrb_bool exclusive;
int n;
n = mrb_get_args(mrb, "oo|b", &beg, &end, &exclusive);
if (n != 3) {
exclusive = FALSE;
}
/* Ranges are immutable, so that they should be initialized only once. */
range_init(mrb, range, beg, end, exclusive);
return range;
}
/*
* call-seq:
* range == obj => true or false
*
* Returns <code>true</code> only if
* 1) <i>obj</i> is a Range,
* 2) <i>obj</i> has equivalent beginning and end items (by comparing them with <code>==</code>),
* 3) <i>obj</i> has the same #exclude_end? setting as <i>rng</t>.
*
* (0..2) == (0..2) #=> true
* (0..2) == Range.new(0,2) #=> true
* (0..2) == (0...2) #=> false
*
*/
mrb_value
mrb_range_eq(mrb_state *mrb, mrb_value range)
{
struct RRange *rr;
struct RRange *ro;
mrb_value obj;
mrb_get_args(mrb, "o", &obj);
if (mrb_obj_equal(mrb, range, obj)) return mrb_true_value();
if (!mrb_obj_is_instance_of(mrb, obj, mrb_obj_class(mrb, range))) { /* same class? */
return mrb_false_value();
}
rr = mrb_range_ptr(range);
ro = mrb_range_ptr(obj);
if (!mrb_bool(mrb_funcall(mrb, rr->edges->beg, "==", 1, ro->edges->beg)) ||
!mrb_bool(mrb_funcall(mrb, rr->edges->end, "==", 1, ro->edges->end)) ||
rr->excl != ro->excl) {
return mrb_false_value();
}
return mrb_true_value();
}
static mrb_bool
r_le(mrb_state *mrb, mrb_value a, mrb_value b)
{
mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b); /* compare result */
/* output :a < b => -1, a = b => 0, a > b => +1 */
if (mrb_fixnum_p(r)) {
mrb_int c = mrb_fixnum(r);
if (c == 0 || c == -1) return TRUE;
}
return FALSE;
}
static mrb_bool
r_gt(mrb_state *mrb, mrb_value a, mrb_value b)
{
mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b);
/* output :a < b => -1, a = b => 0, a > b => +1 */
return mrb_fixnum_p(r) && mrb_fixnum(r) == 1;
}
static mrb_bool
r_ge(mrb_state *mrb, mrb_value a, mrb_value b)
{
mrb_value r = mrb_funcall(mrb, a, "<=>", 1, b); /* compare result */
/* output :a < b => -1, a = b => 0, a > b => +1 */
if (mrb_fixnum_p(r)) {
mrb_int c = mrb_fixnum(r);
if (c == 0 || c == 1) return TRUE;
}
return FALSE;
}
/*
* call-seq:
* range === obj => true or false
* range.member?(val) => true or false
* range.include?(val) => true or false
*
*/
mrb_value
mrb_range_include(mrb_state *mrb, mrb_value range)
{
mrb_value val;
struct RRange *r = mrb_range_ptr(range);
mrb_value beg, end;
mrb_bool include_p;
mrb_get_args(mrb, "o", &val);
beg = r->edges->beg;
end = r->edges->end;
include_p = r_le(mrb, beg, val) && /* beg <= val */
((r->excl && r_gt(mrb, end, val)) || /* end > val */
(r_ge(mrb, end, val))); /* end >= val */
return mrb_bool_value(include_p);
}
static mrb_bool
range_beg_len(mrb_state *mrb, mrb_value range, mrb_int *begp, mrb_int *lenp, mrb_int len, mrb_bool trunc)
{
mrb_int beg, end;
struct RRange *r = mrb_range_ptr(range);
if (mrb_type(range) != MRB_TT_RANGE) return FALSE;
beg = mrb_int(mrb, r->edges->beg);
end = mrb_int(mrb, r->edges->end);
if (beg < 0) {
beg += len;
if (beg < 0) return FALSE;
}
if (trunc) {
if (beg > len) return FALSE;
if (end > len) end = len;
}
if (end < 0) end += len;
if (!r->excl && (!trunc || end < len))
end++; /* include end point */
len = end - beg;
if (len < 0) len = 0;
*begp = beg;
*lenp = len;
return TRUE;
}
MRB_API mrb_bool
mrb_range_beg_len(mrb_state *mrb, mrb_value range, mrb_int *begp, mrb_int *lenp, mrb_int len)
{
return range_beg_len(mrb, range, begp, lenp, len, TRUE);
}
/* 15.2.14.4.12(x) */
/*
* call-seq:
* rng.to_s -> string
*
* Convert this range object to a printable form.
*/
static mrb_value
range_to_s(mrb_state *mrb, mrb_value range)
{
mrb_value str, str2;
struct RRange *r = mrb_range_ptr(range);
str = mrb_obj_as_string(mrb, r->edges->beg);
str2 = mrb_obj_as_string(mrb, r->edges->end);
str = mrb_str_dup(mrb, str);
mrb_str_cat(mrb, str, "...", r->excl ? 3 : 2);
mrb_str_cat_str(mrb, str, str2);
return str;
}
/* 15.2.14.4.13(x) */
/*
* call-seq:
* rng.inspect -> string
*
* Convert this range object to a printable form (using
* <code>inspect</code> to convert the start and end
* objects).
*/
static mrb_value
range_inspect(mrb_state *mrb, mrb_value range)
{
mrb_value str, str2;
struct RRange *r = mrb_range_ptr(range);
str = mrb_inspect(mrb, r->edges->beg);
str2 = mrb_inspect(mrb, r->edges->end);
str = mrb_str_dup(mrb, str);
mrb_str_cat(mrb, str, "...", r->excl ? 3 : 2);
mrb_str_cat_str(mrb, str, str2);
return str;
}
/* 15.2.14.4.14(x) */
/*
* call-seq:
* rng.eql?(obj) -> true or false
*
* Returns <code>true</code> only if <i>obj</i> is a Range, has equivalent
* beginning and end items (by comparing them with #eql?), and has the same
* #exclude_end? setting as <i>rng</i>.
*
* (0..2).eql?(0..2) #=> true
* (0..2).eql?(Range.new(0,2)) #=> true
* (0..2).eql?(0...2) #=> false
*
*/
static mrb_value
range_eql(mrb_state *mrb, mrb_value range)
{
mrb_value obj;
struct RRange *r, *o;
mrb_get_args(mrb, "o", &obj);
if (mrb_obj_equal(mrb, range, obj)) return mrb_true_value();
if (!mrb_obj_is_kind_of(mrb, obj, RANGE_CLASS)) {
return mrb_false_value();
}
if (mrb_type(obj) != MRB_TT_RANGE) return mrb_false_value();
r = mrb_range_ptr(range);
o = mrb_range_ptr(obj);
if (!mrb_eql(mrb, r->edges->beg, o->edges->beg) ||
!mrb_eql(mrb, r->edges->end, o->edges->end) ||
(r->excl != o->excl)) {
return mrb_false_value();
}
return mrb_true_value();
}
/* 15.2.14.4.15(x) */
static mrb_value
range_initialize_copy(mrb_state *mrb, mrb_value copy)
{
mrb_value src;
struct RRange *r;
mrb_get_args(mrb, "o", &src);
if (mrb_obj_equal(mrb, copy, src)) return copy;
if (!mrb_obj_is_instance_of(mrb, src, mrb_obj_class(mrb, copy))) {
mrb_raise(mrb, E_TYPE_ERROR, "wrong argument class");
}
r = mrb_range_ptr(src);
range_init(mrb, copy, r->edges->beg, r->edges->end, r->excl);
return copy;
}
mrb_value
mrb_get_values_at(mrb_state *mrb, mrb_value obj, mrb_int olen, mrb_int argc, const mrb_value *argv, mrb_value (*func)(mrb_state*, mrb_value, mrb_int))
{
mrb_int i, j, beg, len;
mrb_value result;
result = mrb_ary_new(mrb);
for (i = 0; i < argc; ++i) {
if (mrb_fixnum_p(argv[i])) {
mrb_ary_push(mrb, result, func(mrb, obj, mrb_fixnum(argv[i])));
}
else if (range_beg_len(mrb, argv[i], &beg, &len, olen, FALSE)) {
mrb_int const end = olen < beg + len ? olen : beg + len;
for (j = beg; j < end; ++j) {
mrb_ary_push(mrb, result, func(mrb, obj, j));
}
for (; j < beg + len; ++j) {
mrb_ary_push(mrb, result, mrb_nil_value());
}
}
else {
mrb_raisef(mrb, E_TYPE_ERROR, "invalid values selector: %S", argv[i]);
}
}
return result;
}
void
mrb_init_range(mrb_state *mrb)
{
struct RClass *r;
r = mrb_define_class(mrb, "Range", mrb->object_class); /* 15.2.14 */
MRB_SET_INSTANCE_TT(r, MRB_TT_RANGE);
mrb_define_method(mrb, r, "begin", mrb_range_beg, MRB_ARGS_NONE()); /* 15.2.14.4.3 */
mrb_define_method(mrb, r, "end", mrb_range_end, MRB_ARGS_NONE()); /* 15.2.14.4.5 */
mrb_define_method(mrb, r, "==", mrb_range_eq, MRB_ARGS_REQ(1)); /* 15.2.14.4.1 */
mrb_define_method(mrb, r, "===", mrb_range_include, MRB_ARGS_REQ(1)); /* 15.2.14.4.2 */
mrb_define_method(mrb, r, "exclude_end?", mrb_range_excl, MRB_ARGS_NONE()); /* 15.2.14.4.6 */
mrb_define_method(mrb, r, "first", mrb_range_beg, MRB_ARGS_NONE()); /* 15.2.14.4.7 */
mrb_define_method(mrb, r, "include?", mrb_range_include, MRB_ARGS_REQ(1)); /* 15.2.14.4.8 */
mrb_define_method(mrb, r, "initialize", mrb_range_initialize, MRB_ARGS_ANY()); /* 15.2.14.4.9 */
mrb_define_method(mrb, r, "last", mrb_range_end, MRB_ARGS_NONE()); /* 15.2.14.4.10 */
mrb_define_method(mrb, r, "member?", mrb_range_include, MRB_ARGS_REQ(1)); /* 15.2.14.4.11 */
mrb_define_method(mrb, r, "to_s", range_to_s, MRB_ARGS_NONE()); /* 15.2.14.4.12(x) */
mrb_define_method(mrb, r, "inspect", range_inspect, MRB_ARGS_NONE()); /* 15.2.14.4.13(x) */
mrb_define_method(mrb, r, "eql?", range_eql, MRB_ARGS_REQ(1)); /* 15.2.14.4.14(x) */
mrb_define_method(mrb, r, "initialize_copy", range_initialize_copy, MRB_ARGS_REQ(1)); /* 15.2.14.4.15(x) */
}
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