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/**********************************************************************
range.c -
$Author: matz $
$Date: 2002/09/03 05:20:06 $
created at: Thu Aug 19 17:46:47 JST 1993
Copyright (C) 1993-2002 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
VALUE rb_cRange;
static ID id_cmp, id_succ, id_beg, id_end, id_excl;
#define EXCL(r) RTEST(rb_ivar_get((r), id_excl))
#define SET_EXCL(r,v) rb_ivar_set((r), id_excl, (v) ? Qtrue : Qfalse)
static VALUE
range_check(args)
VALUE *args;
{
if (!FIXNUM_P(args[0]) && !rb_obj_is_kind_of(args[0], rb_cNumeric)) {
rb_funcall(args[0], id_cmp, 1, args[1]);
/* rb_funcall(args[0], id_succ, 0, 0); */
}
return Qnil;
}
static VALUE
range_failed()
{
rb_raise(rb_eArgError, "bad value for range");
return Qnil; /* dummy */
}
static void
range_init(range, beg, end, exclude_end)
VALUE range, beg, end;
int exclude_end;
{
VALUE args[2];
args[0] = beg;
args[1] = end;
if (!FIXNUM_P(beg) || !FIXNUM_P(end)) {
rb_rescue(range_check, (VALUE)args, range_failed, 0);
}
SET_EXCL(range, exclude_end);
rb_ivar_set(range, id_beg, beg);
rb_ivar_set(range, id_end, end);
}
VALUE
rb_range_new(beg, end, exclude_end)
VALUE beg, end;
int exclude_end;
{
VALUE range = rb_obj_alloc(rb_cRange);
range_init(range, beg, end, exclude_end);
return range;
}
static VALUE
range_initialize(argc, argv, range)
int argc;
VALUE *argv;
VALUE range;
{
VALUE beg, end, flags;
rb_scan_args(argc, argv, "21", &beg, &end, &flags);
/* Ranges are immutable, so that they should be initialized only once. */
if (rb_ivar_defined(range, id_beg)) {
rb_name_error(rb_intern("initialize"), "`initialize' called twice");
}
range_init(range, beg, end, RTEST(flags));
return Qnil;
}
static VALUE
range_exclude_end_p(range)
VALUE range;
{
return EXCL(range) ? Qtrue : Qfalse;
}
static VALUE
range_eq(range, obj)
VALUE range, obj;
{
if (range == obj) return Qtrue;
if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
return Qfalse;
if (!rb_equal(rb_ivar_get(range, id_beg), rb_ivar_get(obj, id_beg)))
return Qfalse;
if (!rb_equal(rb_ivar_get(range, id_end), rb_ivar_get(obj, id_end)))
return Qfalse;
if (EXCL(range) != EXCL(obj)) return Qfalse;
return Qtrue;
}
static int
r_eq(a, b)
VALUE a, b;
{
if (a == b) return Qtrue;
if (rb_funcall(a, id_cmp, 1, b) == INT2FIX(0))
return Qtrue;
return Qfalse;
}
static int
r_lt(a, b)
VALUE a, b;
{
VALUE r = rb_funcall(a, id_cmp, 1, b);
if (rb_cmpint(r) < 0) return Qtrue;
return Qfalse;
}
static int
r_le(a, b)
VALUE a, b;
{
VALUE r = rb_funcall(a, id_cmp, 1, b);
if (rb_cmpint(r) <= 0) return Qtrue;
return Qfalse;
}
static int
r_gt(a,b)
VALUE a, b;
{
VALUE r = rb_funcall(a, id_cmp, 1, b);
if (rb_cmpint(r) > 0) return Qtrue;
return Qfalse;
}
static VALUE
range_eql(range, obj)
VALUE range, obj;
{
if (range == obj) return Qtrue;
if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
return Qfalse;
if (!rb_eql(rb_ivar_get(range, id_beg), rb_ivar_get(obj, id_beg)))
return Qfalse;
if (!rb_eql(rb_ivar_get(range, id_end), rb_ivar_get(obj, id_end)))
return Qfalse;
if (EXCL(range) != EXCL(obj)) return Qfalse;
return Qtrue;
}
static VALUE
range_hash(range)
VALUE range;
{
long hash = EXCL(range);
VALUE v;
v = rb_hash(rb_ivar_get(range, id_beg));
hash ^= v << 1;
v = rb_hash(rb_ivar_get(range, id_end));
hash ^= v << 9;
hash ^= EXCL(range) << 24;
return LONG2FIX(hash);
}
static VALUE
str_step(args)
VALUE *args;
{
return rb_str_upto(args[0], args[1], EXCL(args[2]));
}
static VALUE
step_i(i, iter)
VALUE i;
long *iter;
{
iter[0]--;
if (iter[0] == 0) {
rb_yield(i);
iter[0] = iter[1];
}
return Qnil;
}
static void
range_each_func(range, func, v, e, arg)
VALUE range;
void (*func) _((VALUE, void*));
VALUE v, e;
void *arg;
{
if (EXCL(range)) {
while (r_lt(v, e)) {
(*func)(v, arg);
v = rb_funcall(v, id_succ, 0, 0);
}
}
else {
while (r_le(v, e)) {
(*func)(v, arg);
v = rb_funcall(v, id_succ, 0, 0);
}
}
}
static VALUE
range_step(argc, argv, range)
int argc;
VALUE *argv;
VALUE range;
{
VALUE b, e, step;
long unit;
b = rb_ivar_get(range, id_beg);
e = rb_ivar_get(range, id_end);
if (rb_scan_args(argc, argv, "01", &step) == 0) {
step = INT2FIX(1);
}
unit = NUM2LONG(step);
if (unit <= 0) {
rb_raise(rb_eArgError, "step can't be <= 0");
}
if (FIXNUM_P(b) && FIXNUM_P(e)) { /* fixnums are special */
long end = FIX2LONG(e);
long i;
if (!EXCL(range)) end += 1;
for (i=FIX2LONG(b); i<end; i+=unit) {
rb_yield(LONG2NUM(i));
}
}
else if (rb_obj_is_kind_of(b, rb_cNumeric)) {
ID c = rb_intern(EXCL(range) ? "<" : "<=");
while (RTEST(rb_funcall(b, c, 1, e))) {
rb_yield(b);
b = rb_funcall(b, '+', 1, step);
}
}
else if (TYPE(b) == T_STRING) {
VALUE args[5];
long iter[2];
args[0] = b; args[1] = e; args[2] = range;
iter[0] = 1; iter[1] = unit;
rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i, (VALUE)iter);
}
else {
long args[2];
if (!rb_respond_to(b, id_succ)) {
rb_raise(rb_eTypeError, "cannot iterate from %s",
rb_class2name(CLASS_OF(b)));
}
args[0] = 1;
args[1] = unit;
range_each_func(range, step_i, b, e, args);
}
return range;
}
static void
each_i(v, arg)
VALUE v;
void *arg;
{
rb_yield(v);
}
static VALUE
range_each(range)
VALUE range;
{
VALUE beg, end;
beg = rb_ivar_get(range, id_beg);
end = rb_ivar_get(range, id_end);
if (!rb_respond_to(beg, id_succ)) {
rb_raise(rb_eTypeError, "cannot iterate from %s",
rb_class2name(CLASS_OF(beg)));
}
if (TYPE(beg) == T_STRING) {
VALUE args[5];
long iter[2];
args[0] = beg; args[1] = end; args[2] = range;
iter[0] = 1; iter[1] = 1;
rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i, (VALUE)iter);
}
else {
range_each_func(range, each_i, beg, end, 0);
}
return range;
}
static VALUE
range_first(range)
VALUE range;
{
return rb_ivar_get(range, id_beg);
}
static VALUE
range_last(range)
VALUE range;
{
return rb_ivar_get(range, id_end);
}
VALUE
rb_range_beg_len(range, begp, lenp, len, err)
VALUE range;
long *begp, *lenp;
long len;
int err;
{
long beg, end, b, e;
if (!rb_obj_is_kind_of(range, rb_cRange)) return Qfalse;
beg = b = NUM2LONG(rb_ivar_get(range, id_beg));
end = e = NUM2LONG(rb_ivar_get(range, id_end));
if (beg < 0) {
beg += len;
if (beg < 0) goto out_of_range;
}
if (err == 0 || err == 2) {
if (beg > len) goto out_of_range;
if (end > len || (!EXCL(range) && end == len))
end = len;
}
if (end < 0) {
end += len;
if (end < 0) {
if (beg == 0 && end == -1 && !EXCL(range)) {
len = 0;
goto length_set;
}
goto out_of_range;
}
}
len = end - beg;
if (!EXCL(range)) len++; /* include end point */
if (len < 0) goto out_of_range;
length_set:
*begp = beg;
*lenp = len;
return Qtrue;
out_of_range:
if (err) {
rb_raise(rb_eRangeError, "%ld..%s%ld out of range",
b, EXCL(range)? "." : "", e);
}
return Qnil;
}
static VALUE
range_min(range)
VALUE range;
{
VALUE b = rb_ivar_get(range, id_beg);
VALUE e = rb_ivar_get(range, id_end);
if (r_le(b, e)) return b;
return e;
}
static VALUE
range_max(range)
VALUE range;
{
VALUE b = rb_ivar_get(range, id_beg);
VALUE e = rb_ivar_get(range, id_end);
if (r_gt(b, e)) return b;
return e;
}
static VALUE
range_to_s(range)
VALUE range;
{
VALUE str, str2;
str = rb_obj_as_string(rb_ivar_get(range, id_beg));
str2 = rb_obj_as_string(rb_ivar_get(range, id_end));
str = rb_str_dup(str);
rb_str_cat(str, "...", EXCL(range)?3:2);
rb_str_append(str, str2);
OBJ_INFECT(str, str2);
return str;
}
static VALUE
range_inspect(range)
VALUE range;
{
VALUE str, str2;
str = rb_inspect(rb_ivar_get(range, id_beg));
str2 = rb_inspect(rb_ivar_get(range, id_end));
str = rb_str_dup(str);
rb_str_cat(str, "...", EXCL(range)?3:2);
rb_str_append(str, str2);
OBJ_INFECT(str, str2);
return str;
}
static void
member_i(v, args)
VALUE v;
VALUE *args;
{
if (rb_equal(v, args[0])) {
args[1] = Qtrue;
}
}
static VALUE
range_member(range, val)
VALUE range, val;
{
VALUE beg, end;
VALUE args[2];
beg = rb_ivar_get(range, id_beg);
end = rb_ivar_get(range, id_end);
if (!rb_respond_to(beg, id_succ)) {
rb_raise(rb_eTypeError, "cannot iterate from %s",
rb_class2name(CLASS_OF(beg)));
}
args[0] = val;
args[1] = Qfalse;
range_each_func(range, member_i, beg, end, args);
return args[1];
}
static VALUE
range_include(range, val)
VALUE range, val;
{
VALUE beg, end;
beg = rb_ivar_get(range, id_beg);
end = rb_ivar_get(range, id_end);
if (r_gt(beg, val)) return Qfalse;
if (EXCL(range)) {
if (r_lt(val, end)) return Qtrue;
}
else {
if (r_le(val, end)) return Qtrue;
}
return Qfalse;
}
void
Init_Range()
{
rb_cRange = rb_define_class("Range", rb_cObject);
rb_include_module(rb_cRange, rb_mEnumerable);
rb_define_method(rb_cRange, "initialize", range_initialize, -1);
rb_define_method(rb_cRange, "==", range_eq, 1);
rb_define_method(rb_cRange, "===", range_include, 1);
rb_define_method(rb_cRange, "eql?", range_eql, 1);
rb_define_method(rb_cRange, "hash", range_hash, 0);
rb_define_method(rb_cRange, "each", range_each, 0);
rb_define_method(rb_cRange, "step", range_step, -1);
rb_define_method(rb_cRange, "first", range_first, 0);
rb_define_method(rb_cRange, "last", range_last, 0);
rb_define_method(rb_cRange, "begin", range_first, 0);
rb_define_method(rb_cRange, "end", range_last, 0);
rb_define_method(rb_cRange, "min", range_min, 0);
rb_define_method(rb_cRange, "max", range_max, 0);
rb_define_method(rb_cRange, "to_s", range_to_s, 0);
rb_define_method(rb_cRange, "inspect", range_inspect, 0);
rb_define_alias(rb_cRange, "to_ary", "to_a");
rb_define_method(rb_cRange, "exclude_end?", range_exclude_end_p, 0);
rb_define_method(rb_cRange, "member?", range_member, 1);
rb_define_method(rb_cRange, "include?", range_include, 1);
id_cmp = rb_intern("<=>");
id_succ = rb_intern("succ");
id_beg = rb_intern("begin");
id_end = rb_intern("end");
id_excl = rb_intern("excl");
}